WO2004063116A1

WO2004063116A1 - Unhydrated moldings of hydraulic composition, process for producing the moldings and usage thereof

Info

Publication number: WO2004063116A1
Application number: PCT/JP2004/000194
Authority: WO
Inventors: Noriyuki Kosakai
Original assignee: Sumitomo Osaka Cement Co.,Ltd
Priority date: 2003-01-15
Filing date: 2004-01-14
Publication date: 2004-07-29
Also published as: KR20040065179A; CN1524821A; JP2004262671A

Abstract

The invention provides unhydrated moldings of a hydraulic composition which are sufficiently freed from the dusting of a hydraulic composition powder in distribution or service and permit long-term storage and simple and easy application; a process for producing the same; and usage thereof. The unhydrated moldings of a hydraulic composition comprise a hydraulic composition and a binder preferably at a weight ratio of the hydraulic composition to the binder of 50 : 50 to 95 : 5, and are useful as cut-off material, joint sealing compound, chemical splitting agent, various mortar premix products, various concrete premix products, various fillers, back filling material, and so on. The process comprises heating a mixture of a binder and a hydraulic composition to a temperature of the softening point of the binder or above, subjecting the resulting mixture to kneading and molding, and cooling the product of molding to thereby obtain an objective unhydrated molding.

Description

Description Unhydrated molded body of hydraulic composition, method for producing the same, and method for using the same

The present invention relates to an unhydrated molded product of a hydraulic composition, a method for producing the same, and a method for using the same, and particularly to various uses in which the hydraulic composition is used, for example, a crack injection material, a static crushed material, Unhydrated molding of hydraulic composition that can be distributed and used in a simple form as various mortar premix products, various concrete premix products, various filling materials, backfilling materials, etc. The present invention relates to a body, a method for producing the same, and a method for using the same. Background art

Conventionally, a hydraulic composition is packaged in a moisture-proof paper bag, a plastic bag, or the like, as its own powder, or as a mixed powder obtained by premixing these with aggregates and various additives. It is distributed.

In particular, most cement-based materials are currently distributed in packages of 20 to 25 kg.

Such a bagged hydraulic composition is generally opened in a bag, charged into a stirring vessel or a stirring mixer, added with a predetermined amount of water, and kneaded.

The kneaded mortar or concrete is prepared in advance. It is poured or poured into a mold, and is compacted appropriately, for example, by vibrating vibrator, etc., after adjusting the material separation, etc., and left to cure.

In recent years, miniaturization of the hydraulic composition in the distribution form and the like has been progressing. However, bag containers, which are the mainstream of the distribution form described above, are heavy, difficult to transport, and inconvenient to handle.

Although the hydraulic composition has a true specific gravity of 2 to 3, it has a bulk specific gravity of about 1 and requires twice the volume of its actual weight, so it is difficult to fill the bag into compacts, and it can be transported and handled on site. However, it is extremely hard work.

Also, when the hydraulic powder is put into a kneading container or equipment, a large amount of dust is generated, which is not environmentally friendly.

Furthermore, even if the hydraulic composition is contained in a moisture-proof bag, it has a high reactivity to moisture and moisture in the air. For this reason, the storage period is currently at most about 6 months.

After the use of the hydraulic composition, a large number of empty bags containing the hydraulic composition are generated, which is a waste of resources and waste. In particular, bags containing hydraulic compositions such as cement are difficult to burn and are difficult to incinerate.

Conventionally, as a method for repairing and reinforcing concrete cracks, first remove the foreign matter by cleaning the area around the crack, and depending on the width of the crack, use a piece of equipment such as a cutlery. Is cut into a V-shape and then sealed with a resin-based sealing agent, etc., and a crack material mainly composed of hydraulic composition is injected. Is used.

However, in this case, specialized equipment such as a concrete cutter / filling agent infusion device and an infusion pump is required, and the equipment becomes large-scale, requiring specialty.

Also, the conventional method is excellent in repairing cracks, but the repaired part often differs in color from the original body, and is not satisfactory from the viewpoint of the aesthetic appearance of the structure.

Further, for example, in the case of a water-stopping material, the hydraulic composition is quickly kneaded with water in a rubber container or the like, and the kneaded material is manually pressed and rubbed into a predetermined leaking point. Despite the water stopping effect, this method is extremely inefficient.

In the case of statically crushed materials, the hydraulic composition is mixed with water and poured into pre-drilled rocks and concrete holes, and the crushing effect is obtained by the strong expansion force accompanying hydration. ing.

In general, regarding crushing in water, a paste obtained by mixing a static crushing agent and water has a specific gravity of 2 or more and is heavier than water. When poured, water is replaced by the difference in specific gravity, and the paste can be filled in the perforation.

However, even if the paste has a specific gravity of 2 or more, it is extremely difficult to pour a liquid substance into the hole in water.

In addition, work in the water depends on the current In addition to the spread of birds, the paste shows strong alkalinity and is not environmentally friendly considering its effect on the surrounding ecosystem.

As another method, a method is used in which a small bag is filled with a static crushing agent and the bag is directly pushed into the perforation. In this method, the water required for hydration and expansion of the static crushing agent is supplied through a filled cloth bag.

Although this method can prevent the static fracturing agent from diffusing, it is extremely difficult and inefficient to pack the bag tightly into the hole in the water, and the bag does not necessarily follow the shape of the hole. Unfilled pores cause unnecessary voids in the holes.

In addition, the hole-in anchor is a general-purpose tool that is used in many concrete applications on a daily basis for concrete work, such as holding the formwork during concrete work. It is often removed upon completion. After removal, many holes with a diameter of usually 6 to 20 mm and a depth of about 100 mm remain as traces on the concrete surface.

Leaving the traces as they are will impair the aesthetics, so they are buried later.However, for example, in bridge construction, the number of traces is large, and the backfill work is extremely time-consuming. .

At the time of this post-filling, cement, sand, an appropriate amount of water, and premix mortar material for repairs are manually filled, and post-filling is currently performed.

In view of such a problem, a method of molding and solidifying the hydraulic composition powder As a law, Patent No. 2 514 668 states that 5 to 95 parts by weight of a hydraulic composition consisting of at least one of cement, slag, and gypsum, quicklime or hard clay 5 to 95 parts by weight of lime or a mixture thereof, and further 0.5 to 1.5% by weight of a crushing aid to the above-mentioned hydraulic composition, and pressurize to form a molded product into a briquette Is disclosed.

However, such a molded article contains the hydraulic composition, but the molded article is produced by simply pressing and compressing the raw material powder, and is fragile and in a distribution form. The form of use is not enough to solve the above problems.

An object of the present invention is to solve the above problems, sufficiently prevent the generation of dust of the hydraulic composition powder during distribution and use, enable long-term storage, and simplify the form of use. An object of the present invention is to provide an unhydrated molded article of a hydraulic composition that can be obtained.

Another object of the present invention is to provide a method for producing an unhydrated molded body of a hydraulic composition, which can efficiently, simply and economically mold the above unhydrated molded body. And

Further, another object of the present invention is to provide a method of using an unhydrated molded article of a hydraulic composition, which can easily and effectively utilize the above unhydrated molded article for various uses. Is what you do. Disclosure of the invention

The unhydrated molded article of the hydraulic composition of the present invention is characterized by containing the hydraulic composition and a binder. Preferably, in the above unhydrated molded article, the hydraulic composition and the binder are contained at a weight ratio of 50:50 to 95: 5 parts by weight.

Also, particularly preferably, in the above-mentioned unhydrated molded article, the binder is a water-soluble and thermoplastic polymer compound.

In producing an unhydrated molded article of the hydraulic composition of the present invention, the binder and the hydraulic composition are heated to a temperature equal to or higher than the softening point of the binder, kneaded, molded, and then cooled. It is characterized in that it is a molded body.

Preferably, in the method for producing an unhydrated molded article, the binder is heated to a temperature equal to or higher than the softening point of the binder to make the binder liquid, and the hydraulic composition is mixed with the binder. Injection molding or mixing the hydraulic composition with the binder while maintaining the temperature, and then kneading the mixture by heating it to a temperature equal to or higher than the softening point of the binder. Extrusion molding is preferred.

The method of using the unhydrated molded article of the hydraulic composition of the present invention is as follows by adding water to the unhydrated molded article of the hydraulic composition of the present invention and curing the molded article. It is used effectively for various applications. -Preferably, in the method of using the unhydrated molded article of the hydraulic composition, the unhydrated molded article of the hydraulic composition is applied to a surface portion of a crack of a structure, and then applied. In front of conventional crack injection material It is characterized in that it is used as a crack filler to fill the inside of the crack and repair the crack. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described with reference to the following preferred examples, but the invention is not limited thereto.

The unhydrated molded article of the hydraulic composition of the present invention contains the hydraulic composition and a binder.

In the present invention, by using a binder instead of water used for the hydration reaction of the hydraulic composition, the hydraulic composition can be formed into a desired three-dimensional shape without using water. It can be molded and solidified.

The hydraulic composition used in the unhydrated molded article of the present invention can be composed only of hydraulic powder.

Here, the hydraulic powder means a powder which hardens by water, and is preferably ordinary Portland cement, Jet cement, Alumina cement, Ultra fast cement, Silica Calcium, calcium aluminate, calcium fluoroaluminate, calcium sulfoaluminate, calciumaluminoferrite, calcium phosphate, slag, hemihydrate or anhydrous gypsum and self-hardening quicklime At least one type of powder selected from the group consisting of powders is used.

The particle size and the like of the hydraulic powder are not particularly limited, but from the viewpoint of the pot life during molding and the strength of the obtained compact, the average particle size It is preferably about 100 to about 40 ^ m, and from the viewpoint of ensuring high strength of the molded body, the Blaine specific surface area is preferably at least 2500 c ² / g.

Further, the hydraulic composition used in the present invention may contain a non-hydraulic powder in addition to the above-mentioned hydraulic powder.

The non-hydraulic powder means a powder that does not harden even when it comes into contact with water by itself, but its components are eluted in an alkaline or acidic state or a high-pressure steam atmosphere, Non-hydraulic powders that also include powders that react with other dissolved components to form products include calcium hydroxide powder, gypsum gypsum powder, calcium carbonate powder, slag powder, At least one kind of powder selected from the group consisting of fly ash powder, silica powder, clay powder and silica fume powder can be suitably used.

These non-hydraulic powders have a function of increasing the strength by a pozzolanic reaction or a microfilament effect.

The average particle size of these non-hydraulic powders is preferably at least one order of magnitude smaller than the average particle size of the hydraulic composition powder, and more preferably at least two orders of magnitude smaller than the average particle size of the hydraulic composition powder. It is preferable in that the gap between the hard powders is filled and the compact becomes dense, but the lower limit of the fineness is not particularly limited, and is not particularly limited as long as the effect of the present invention is not impaired. Usually, the average particle size of the hydraulic powder is preferably about 1Z500 from the viewpoint of obtaining good moldability.

By using a non-hydraulic powder with such a particle size, It is possible to further improve the shape maintenance of the shape.

The binder used for the unhydrated molded article of the hydraulic composition of the present invention is not particularly limited as long as it is a polymer compound that is soluble in water. In particular, binders used in metal / ceramics injection molding, and thermoplastic resins generally used in resin molding can be used.

The binder is more preferably softened and flowed by heat, has a function as a fluidizing agent of the hydraulic composition, and is usually used at an ambient temperature at which the hydraulic composition is used. It is desirable that the binder be solid. Further, it is preferable that the binder has a molecular weight of 500 or more from the viewpoint that the moldability is further improved. The upper limit of the molecular weight has a large effect on the kneadability as the molecular weight increases. Therefore, it is desirable to appropriately select and set the upper limit within a range that does not affect the kneadability.

Specifically, examples of the water-soluble polymer include polyalkylene glycols represented by poly (ethylene glycol) and polymethylene glycol, polyvinyl alcohols such as poval, potassium oxymethyl cellulose, and hydroxymethyl cellulose. Cellulose or cellulose ethers such as Dloxityl cellulose and cationized cellulose, methyl vinyl ether such as VEMA (Bema) and water-free maleic acid copolymers, starches, and alcohols Examples include poly (ethylene oxide) obtained by ring-opening polymerization of ethylene oxide.

Also used as a binder for metal or ceramic injection molding For example, degreasing with a low softening temperature, such as polyethylene and polypropylene, paraffin wax, natural wax, a material containing a combination of various waxes containing modified polyacetal as a main component, agar, etc. .

Examples of thermoplastic resins include general-purpose resins such as polyethylene, polypropylene, and polystyrene; engineering plastics such as polyacetal and polyamide; and polyphenylenesulfide and polyamide imide. Super engineer ring plastics and the like.

The binder can be used for various types of molding such as injection molding, extrusion molding, pressure molding, etc., but it is particularly preferable to use the binder suitably for injection molding and extrusion molding. It is desirable from the viewpoint that the three-dimensional shape of the body is efficiently manufactured in large quantities.

In the unhydrated molded article of the present invention, the hydraulic composition and the binder are in a weight ratio of 50:50 to 95: 5 parts by weight, preferably 80:20 to 90: It is preferably contained in a proportion of 10 parts by weight.

By being mixed at such a weight ratio, not only the moldability is excellent, but also the shape retention is improved.

In addition, when the unhydrated molded article is used for various purposes and is brought into contact with water to promote the hydration reaction, for example, in crack repair, no trace of the color of the repair material such as a binder is left. Almost the same color as the original body can be obtained, and good aesthetics can be maintained. Also, when used as a static crushed material, appropriate expansion is obtained, Good crushing efficiency.

Next, a method for producing an unhydrated molded article of the hydraulic composition of the present invention will be described.

The unhydrated molded article of the hydraulic composition of the present invention is formed by heating and kneading the binder and the hydraulic composition to a temperature equal to or higher than the softening point of the binder at the mixing ratio described above, and then molding. Then, it is cooled to form an unhydrated molded body.

Specifically, as a molding method, an injection molding method, an extrusion molding method, a pressure molding method, a cast molding method, or the like can be used. However, the molding method is not limited thereto, and may be a known method. A molding method can be used.

In order to prepare the unhydrated molded article of the present invention, first, the hydraulic composition and the binder are uniformly mixed at the above mixing ratio to prepare. The mixing method is not particularly limited as long as the mixing is performed at a temperature equal to or higher than the softening point of the binder. Even if a mixed material in which the binder and the hydraulic composition are mixed in advance is used, these components can be uniformly mixed during molding. Any method may be used as long as the hydraulic composition and the binder can be uniformly mixed.

In particular, when a hydraulic composition containing a hydraulic powder and a non-hydraulic powder is used, it is preferable to employ a mixing method capable of applying a strong shearing force. Knead using 1st grade. By mixing using such a mixer having a high shearing force, the time required for mixing can be reduced. In the case of injection molding, the binder is softened. Above the temperature to bring the binder into a molten state, to which the hydraulic composition is mixed, melt-kneaded and mixed, and then injection-molded while maintaining the temperature and cooled. To produce unhydrated compacts.

Specifically, the binder is heated to a temperature equal to or higher than the softening point of the binder so that the binder is in a molten state and fluidized, and while maintaining the heated state, the hydraulic composition is added to the molten binder. The raw materials are mixed and uniformly stirred and kneaded to obtain a mixed fluid material. This is a method in which the fluid material is cast into a mold maintained at a temperature lower than the softening point of the binder, cooled and solidified to form a molded and solidified body to obtain an unhydrated molded body.

If necessary, a binder and a hydraulic composition are melt-kneaded at a temperature equal to or higher than the softening point of the binder to prepare a mixed material, and the mixed material is formed into a pellet-shaped raw material for injection molding. At the time of molding, the pellet-shaped raw material is again melted and kneaded in a heated cylinder inside the injection molding machine, and filled into a mold of a desired shape by an injection device to obtain an unhydrated molded body. You may.

In the case of extrusion molding, the hydraulic composition and the binder are mixed, and the mixed material is heated to a temperature equal to or higher than the softening point of the binder to be kneaded into a fluid state, and then the temperature is maintained. After extrusion molding while cooling, an unhydrated molded body is produced by cooling.

Specifically, the binder and the hydraulic composition are heated and held at a temperature equal to or higher than the softening point of the binder, for example, a material transfer screw or a die portion of an extrusion molding machine, or press It is put into a mold of the machine to make it flow, and the fluid material is extruded from an extrusion molding machine maintained at a temperature lower than the softening point of the binder, for example, about 500 kg kg cm ² It is extruded under the following molding pressure to form a mold and densify, and then cooled to obtain an unhydrated compact.

The unhydrated molded article obtained in this way is a mixture of a binder and a hydraulic composition. The composition distribution in the thickness section direction of the molded article is preferably There is a bindery portion on the outer side of the molded body, and a structure having a composition gradient that gradually becomes the hydraulic composition rich toward the inside is desirable. It is preferable that a thin film of the binder is formed on the outer part of the body from the viewpoint of long-term storage.

This is thought to be due to the following reasons.

First, in a heated mold, a molten fluidized material of a mixed material of a hydraulic composition and a binder is cast. Specifically, the hydraulic composition powder is molten. It is flushed to the binder and injected into the mold.

The flow behavior of the mixed material in the molten fluid state in the mold is such that only the binder exists separately because the temperature near the mold surface is high, and the molten binder precedes and does not accompany the hydraulic composition powder. It is thought to flow.

As a result, a thin film of several to several tens of meters of binder is formed on the surface of the unhydrated molded body obtained, and when cooled to room temperature, it becomes strong. It is considered to be a hard coating that blocks moisture, prevents weathering, and enables long-term storage.

Since the unhydrated molded body obtained in this way has an appropriate disintegration property, it is used as a waterproof material, a crack injection material, a static crush material, various mortal blemix products, various concrete premix products, Various filling materials ゃ Can be used as backfill materials.

The unhydrated molded article of the hydraulic composition of the present invention is given a shape without using water, realizes demolding in a short time, and further, no water is used in the molding and solidification stage Things.

Therefore, in order to harden the unhydrated molded article of the hydraulic composition of the present invention, the unhydrated molded article is treated with a waterproof material, a crack injection material, a static crushed material, various mortar premix products, After it is used as various concrete premix products, various hole filling materials and backfilling materials, it is necessary to supply moisture and cure.

An example in which an unhydrated molded article of the hydraulic composition of the present invention is used as a crack injection material will be described below.

The unhydrated molded article of the hydraulic composition of the present invention is produced into a desired shape, for example, a chalk-shaped molded article.

Such a chalk-like unhydrated molded product is easily disintegrated by rubbing it along cracks that have occurred on concrete, tiles, or painted walls, etc. Easily filled.

After filling, if water is supplied to the filling point with a spray or sponge, for example, the filled material is unhydrated, The union reaction begins and hardens within the crack, completing the crack filling.

When the tip of the unhydrated molded article of the present invention formed into a desired shape, for example, a chalk, is immersed in water for about 5 to 30 seconds, the binder dissolves and softens in water and is immersed in water. Since only the tip end becomes a flexible paste, the paste may be rubbed into the crack.

With either method, the hydration reaction is completed in a short period of time, especially when ultra-hard cement is used as the hydraulic composition, the hydration reaction is completed within several minutes. As a result, crack repair can be performed in a short time and easily, and any person can easily repair cracks.

Preferably, in order to completely seal the crack, the crack filler of the present invention can be used in combination with a conventional crack injection material.

Specifically, for example, the unhydrated crack filler of the present invention is rubbed against the target crack, and at this time, the surface portion is used as a filling port for the conventional crack filler to be filled later. For example, about 5 to 10 mm, the crack filler of the present invention is left without being rubbed.

Next, water is provided by removing the portion of the crack filler of the present invention that has protruded from the crack with a brush or the like, and pressing a sponge or the like containing water against the filled crack filler of the present invention, Let unhydrated be a complete hydrate. Here, as the crack filler of the present invention, for example, ultra-fast hardening cement is used, the curing is completed promptly, and at this time, the aesthetic appearance of the cracked portion is maintained and partly closed. Is completed.

As described above, the existing crack injection material (for example, product name: ultra-fine cement cement cracks Note. Entry refill filler, Sumitomo Osaka Cement Co., Ltd.) Kneaded into a crack, for example, using an Acryl syringe.

In the method, when the crack is deeply cut into the inside, the conventional crack injection material is densely filled into the inside of the crack and the crack is surely repaired, while the crack filler of the present invention is applied to the surface portion. By using the material, it is possible to maintain the aesthetic appearance of the surface portion and to exhibit a function as a sealing material for preventing the conventional crack injection material from leaching.

By blocking the cracks in this way, it is possible to prevent water from penetrating into the concrete body from the cracks and to prevent corrosion of the internal reinforcing steel, and as a result, the concrete The durability of the frame is improved.

The repaired part obtained is excellent in waterproofness, the color difference after the repair is almost the same as that of the original body, and the aesthetic appearance can be effectively maintained. Furthermore, by blocking the cracks in this way, it is possible to prevent water from penetrating from the cracks to the concrete body and prevent corrosion of the internal reinforcing steel, and as a result, The durability of the concrete frame is improved. An example in which an unhydrated molded article of the hydraulic composition of the present invention is used as a static crushed material will be described below.

An unhydrated molded article of the hydraulic composition of the present invention is formed into a desired shape, for example, a hollow cylindrical shape.

Perforate the rock or concrete to be crushed with the same diameter as the hollow cylindrical unhydrated compact, and insert the hollow cylindrical unhydrated compact of the present invention into the hole. When a predetermined amount of water is poured into the hollow inner diameter of the filled hollow cylindrical unhydrated molded body, the hydration expansion reaction starts immediately, and the expansion force generates tensile stress on rocks and concrete. It can be broken down and broken down.

Therefore, it is very effectively used especially for underwater crushing.

Here, underwater crushing refers to, for example, the crushing of existing underwater concrete structures in the extension or renovation of underwater concrete structures in ports and harbors.

Normally, static crushed products are made into a paste with excellent fluidity by premixing water.

It is said that the specific gravity of this paste is about 2.3 and heavier than water, so it is possible to fill the holes drilled in the underwater structure with a specific gravity difference, but in places where there is a tidal current, It is difficult.

In view of this point, a method has been used in which a powdered static crushing agent product is loaded into a cloth bag and inserted into the hole while pushing it with a stick.However, this work in water is inefficient and is not always effective. Effective underwater breach It is not a crushing method.

On the other hand, in the present invention, the statically crushed material composed of the unhydrated molded body of the hydraulic composition of the present invention is formed in a non-hydrated state in advance, for example, in the form of a rod to obtain pores. The insertion into the inside is very simple because it only involves inserting the rod-shaped unhydrated molded body.

When water gradually penetrates into the filled unhydrated molded body, the hydration reaction of the crushing agent starts and expansion occurs, so that tensile stress is generated in the concrete body and the like. And it can be crushed.

Further, if necessary, by forming a small water hole of about l to 2 mm in the length direction of the central part of the unhydrated molded body, the hydration reaction can be performed efficiently. You can also.

An example in which an unhydrated molded article of the hydraulic composition of the present invention is used as a hollow anchor and a backfill material will be described below.

Pulling out and disseminating hole anchors for concrete and bedrock is a common case regardless of civil engineering or construction.

If the anchor marks are left as they are, holes will remain in the concrete, so it is necessary to backfill them.The anchor marks usually have a diameter of about 17 mm and a depth of about 120 mm. With small holes, for example, in the upper part of one bridge (construction of a bridge girder on a pier), backfilling work of thousands of anchor traces may occur. Conventionally, mortars kneaded in small amounts one by one By hand, Although the method of filling with a thin stick or a sashi was used, such a method is extremely inefficient.

According to the present invention, the unhydrated molded article of the present invention having substantially the same dimensions as the anchor mark is formed into, for example, a diameter of about 17 mm and a length of about 120 mm in advance, and is hammered into the hole. Further, when a predetermined amount of water is supplied, for example, about 30% by weight of water, a hydration reaction occurs and the backfilling operation can be completed.

Alternatively, the unhydrated molded article of the present invention may be immersed in water for several minutes to several hours in advance, and when it becomes soft by absorbing water, it may be hammered into the hole in the same manner as described above. In this case, the backfill work can be completed.

In particular, it is preferable to use a volatile binder such as wax in the hole-in anchor backfill material as a binder in order to improve the water absorption of the unhydrated molded article.

This is because after molding and curing, the binder can be volatilized to some extent by heat to make a sparse unhydrated molded body, thereby improving the water absorption when immersed in water. It is.

An example in which an unhydrated molded product of the hydraulic composition of the present invention is used as a mortar premix product will be described below.

The unhydrated molded product of the hydraulic composition of the present invention can be immediately introduced into the mixer containing a predetermined amount of water by adjusting the amount of the contained binder so that the water immediately permeates. However, by directly charging the unhydrated compact, kneading can be performed in exactly the same manner as when powder is charged, and the fresh mortar (still solidified) can be obtained in a short time. Mortar).

The unhydrated molded article of the present invention can be promptly mixed with water to produce a uniform fresh mortar, and the obtained mortar has the same level of strength development as conventional products.

As for the unhydrated molded product for mortar premix, the smaller the amount of the binder is, the better, considering the performance such as strength development after curing, but the amount of the binder is 3% by weight with respect to the hydraulic composition. %, The moldability and the shape maintaining property are difficult, so that the binder amount is particularly preferably 3 to 10% by weight, particularly preferably about 5 to 10% by weight.

The unhydrated molded article of the hydraulic composition of the present invention can be easily and solidified by molding the powder of the hydraulic composition into a desired shape, and is used for various uses other than the above. It is possible to keep the environment extremely fine without generating dust in the working environment in which it can be used and in the distribution condition.

Furthermore, the unhydrated molded article of the hydraulic composition of the present invention can prevent long-term storage by preventing weathering.

In addition, the method for producing an unhydrated molded article of the hydraulic composition of the present invention enables the above-mentioned unhydrated molded article to be molded efficiently, simply, and economically.

Further, the method of using the unhydrated molded product of the hydraulic composition of the present invention can achieve curing of the hydraulic composition by replenishing water when used, and can be widely used. Open new applications In addition, the handling can be simplified.

In particular, the unhydrated molded article of the hydraulic composition of the present invention can be easily and reliably filled and repaired with cracks and the like by any person without requiring special tools and techniques. Since water can be prevented from entering into the interior of the building and the occurrence of internal reinforcing steel can be prevented, it is possible to prevent deterioration and breakage of the concrete and the like. Example

The present invention will be described with reference to the following examples, comparative examples, and test examples. <Crack injection material or filler>

Example 1

Water-blocking material (trade name Lioncis 101; manufactured by Sumitomo Osaka Cement Co., Ltd.) and water-soluble polymer (trade name Ρ Ε とする) — 1; manufactured by Sumitomo Seika Co., Ltd.) and weighed so that the water-blocking material (powder): water-soluble polymer (powder) has a weight ratio of 9: 1, and coarsely mixed. The mixture was mixed at 85 for 15 minutes to obtain a homogeneous flowing mixture.

The mixture is put into an extruder, extruded in a molten fluid state while maintaining the temperature of the screw and the extrusion die at 80 ° C., cooled, and cooled to a diameter of 17 mm and a length of 90 mm. It was molded into an elongated cylindrical shape of mm, just like a chalk, to produce an unhydrated molded article of the hydraulic composition as a crack injection material or filler of the present invention. Comparative Examples 1 to 3

Using a commercially available epoxy crack repair material (trade name: flexible epoxy resin E600; manufactured by Konishi Co., Ltd.) as a comparative example 1, a commercially available elastic seal material crack repair material (trade name View Seal) 699; Konishi Co., Ltd.) as a comparative example 2, and a commercially available ultra-fine-grain cement-based crack repair material (trade name: Refill Fillpond; Sumitomo Osaka Cement Co., Ltd.) As Comparative Example 3, it was used as a crack injection material or a filler. Test example 1

(1) Waterproof

(Preparation of DUT)

A mock test specimen, modeled on a concrete detached house foundation with a total length of 15 m, height of 45 cm, and thickness of 10 cm, is cast with concrete mixed with excess expansive material. In addition, a total of 42 cracks with a width of 0.8 to 1.2 mm, which were intentionally cracked by constraining the bottom surface with reinforcing steel, occurred at intervals of approximately 30 cm. Most of these cracks were penetration cracks in both the height and thickness directions.

The specimen with such a penetration crack was used as the test object.

(Waterproofing == Test to confirm the effect of reinforcing steel on 鲭)

Of the 42 cracks that occurred in the DUT, 12 Were left untreated, six were the cracked filler or filler of Comparative Example 1, the other six were the cracked filler or filler of Comparative Example 2, and the remaining six were the cracked filler or filler of Comparative Example 3. The material was used to fill and repair cracks as described in each manual.

On the other hand, the tip of the chalk-shaped unhydrated cracked filler or filler obtained in Example 1 above was immersed in water for 5 to 30 seconds to soften it. The cracked filler or filler was rubbed along the remaining 12 cracks to fill and repair the crack.

Twenty-four hours after the repair, salt water with a concentration of 15% by weight was sprayed continuously for 48 hours from the direction perpendicular to the repaired surface.

Seven days after spraying was stopped, the test piece was dismantled and the condition of the internal reinforcing steel was checked.

The results are shown in Table 1.

table 1

From Table 1 above, it can be seen that the unhydrated crack injection material according to the present invention or According to the filler and the repair method, the repair method can be remarkably simplified, and it can provide the same anti-cracking effect of the reinforcing bar as a commercially available ultra-fine-grain cement-based crack repair material. Understand.

It was also confirmed that the unhydrated crack injection material or filler of the present invention obtained by using the injection molding method had the same effect.

(2) Aesthetic maintenance effect

(Measuring method)

When performing the above-mentioned crack repair on the DUT, a digital camera was used to photograph the condition before and after using each crack injection material or filler from the same location at the same time, The image was transmitted to a computer, and the RGB value of each pixel was measured using an image retouching software ADOBEPHOTOSHOP manufactured by ADOBESYSTEMS Co., Ltd., that is, the color difference (color difference) of the cracked portion was measured.

(Color difference measurement result)

Table 2 shows the measurement results. Table 2

From Table 2, it is clear that the unhydrated crack injection material or filler of the present invention has almost the same color difference after repair as the test piece concrete as the reference base material before repair. It is clear that it has excellent aesthetics maintaining performance, that is, it has an effect of making cracks less noticeable.

Further, since the range of the color difference of the RGB value that can be judged by human eyes is around 10, when the repair is performed using the unhydrated crack injection material or the filler of the present invention, after the repair, As a result, cracks can be hardly recognized by human vision.

Example 2

A uniform mixture was prepared in the same manner as in Example 1 except that the water-stopping material of Example 1 was replaced with static crushed material powder (trade name: S-Might VA; manufactured by Sumitomo Osaka Cement Co., Ltd.). Obtained. The mixture was charged into an extruder in the same manner as in Example 1, and extruded into a cylindrical shape having a diameter of 5 Omm and a length of 100 Omm by extrusion, followed by cooling. An unhydrated molded body of the hydraulic composition as a static fractured material was manufactured. Comparative Example 4

A commercially available static crushed material (trade name: S-Mite A, for spring and autumn; manufactured by Sumitomo Osaka Cement Co., Ltd.) was used for comparison. Test example 2

(Concrete crushing test)

The underwater concrete specimen was used as the crushing specimen. The concrete specimen had a cylindrical hole with a diameter of 5 Om m and a length of 1000 mm.

Next, the statically crushed material obtained in Example 2 was filled in the hole of the concrete specimen. Filling could be carried out very simply and tightly.

On the other hand, with respect to the powder of the static crushed material of Comparative Example 4, water was mixed to a kneading water ratio of 27% by weight to prepare a paste, and the paste was mixed with the above concrete. The test piece was filled in the hole.

Table 3 shows the measurement conditions of the test, and Table 4 shows the measurement results. Table 3

Table 4

The inflation pressure in the table was measured according to the following procedure.

1) Cut a seamless steel pipe S CH 40 — 2 O A steel pipe (OD 53 mm, ID 50 mm) manufactured by NKK (Nippon Kokan Co., Ltd.) to a length of 40 cm.

2) The static crushed material according to Example 2 or Comparative Example 4 was loaded into this steel pipe. The method is as follows.

That is, in Example 2, the homogeneous mixture obtained in the same manner as in Example 1 was formed into a hollow cylindrical shape having an outer diameter of 49.9 mm and an inner diameter of 2 mm by extrusion molding, and this was molded. It was inserted and loaded into the steel pipe, and water for hydration was injected into a 2 mm bore.

In Comparative Example 4, the paste used in the concrete crushing test was injected and filled.

3) Next, along with the outer diameter of the steel pipe, attach a general-purpose strain gauge FLA-6-11 with a lead wire manufactured by Tokyo Sokki Co., Ltd. according to the manual of the strain gauge. did. 4) According to the above procedures 1) to 3), all of the statically crushed material inside the steel pipe undergoes significant volume expansion due to the hydration reaction, and this expansion force is applied to the outer diameter surface of the steel pipe. It appeared as tensile elongation strain. This tensile elongation strain was measured by the strain gauge attached in 3), and the expansion pressure was calculated by multiplying by the elastic coefficient of the steel pipe.

Table 4 shows that the crushing method using the unhydrated static crushed material of the present invention can significantly simplify the crushing method and can be crushed almost in the same manner as conventional products.

In addition, it was confirmed that the unhydrated statically crushed material of the present invention obtained by using the injection molding method had the same effect.

Example 3

As the hydraulic composition, ordinary Portland Cement (PC; manufactured by Sumitomo Osaka Cement Co., Ltd., Tochigi Plant) is used, and the binder melts at 89 ° C (wax) (product) The name was “Micro-Crystallin Wax; made by Nippon Seisaku Co., Ltd.

The mixing ratio of the wax: hydraulic composition was set to 15:85 parts by weight, and the obtained mixture was charged into an extruder at a temperature of 95 C to form a cylinder having a diameter of 17 mm. Then, after cooling to room temperature and curing, it was cut into a predetermined length of 12 O mm. Then, the rod-shaped unhydrated molded product was stored in a dryer kept at 250 for 5 hours to evaporate the wax. This series of work processes More specifically, an unhydrated hole anchor backfill material of the hydraulic composition as the hole anchor backfill material of the present invention was produced. Comparative Example 5

Ordinary Portland Cement (PC; manufactured by Sumitomo Osaka Cement Co., Ltd., Tochigi Plant) and JISA 500-5 — 199 3 Water and water are uniformly mixed at a ratio of 1: 4: 0.3 parts by weight to form a fresh mortar, which is pressed into a hole in the anchor by a small hand pump with a capacity of 3 liters. The surface was finished flat with a metal iron. Test example 3

(Efficiency of backfilling work of anchors)

Many anchors were extracted from the concrete where the hole anchors were embedded.

The size of one hole after removal of a number of anchors had a cylindrical shape with a diameter of 17 mm and a depth of 120 mm. The hole-anchor backfill material obtained in Example 3 was hammered into the anchor trace of the concrete having a large number of anchor traces having such a shape, and the filled filler was filled. Water was supplied to the hole anchor backfill material in an amount of 30% by weight of the hole anchor backfill material to cure the material and complete the work of backfilling the anchor traces. On the other hand, the mortar backfill material of Comparative Example 5 was manually backfilled in each of the above anchors.

Table 5 shows the work efficiency of both cases.

Table 5

From Table 5 above, it can be seen that the unhydrated backfill material of the present invention has improved work efficiency by about 5.5 times as compared with the conventional one.

In addition, it was confirmed that the unhydrated backfill material of the present invention obtained by using the injection molding method also had the same effect.

Examples 4 to 7

Ultra-fast curing non-shrink mortar (trade name Filcon S; manufactured by Sumitomo Osaka Cement Co., Ltd.) as a hydraulic composition, and polyethylene glycol (trade name PEG # 6) as a binder (Asahi Denka Kogyo Co., Ltd.) at a mixing ratio shown in Table 6 to obtain a mixture. The mixture is charged into an extruder at a temperature of 85 ° C., and molded into a cylindrical shape. · Unprocessed molded body was obtained by processing.

The unhydrated molded body was directly charged into a mixer mixed with a predetermined amount of water and kneaded to produce a fresh mortar.

Table 6 shows the relationship between the amount of binder and the time of the fresh mortar production process. Table 6

From Examples 4 to 7 shown in Table 6, it is clear that even if the weight% of the binder is changed to 10 to 30% by weight with respect to the total weight of the ultra-fast hardening non-shrink mortar and the binder, the fresh mortar is not changed. As a result, it became clear that there was almost no difference in the time when fluidization or kneading disappeared and uniformity could be secured.

From the viewpoint of the strength development and durability of the mortar, it is clear that it is better to use a smaller amount of binder (the ones that do not contain cement, sand, and water, which are the original components of mortar, are better). Therefore, the amount of the binder is preferably 3 to 10% by weight, more preferably 5 to 10% by weight, based on the total weight of the ultra-hard nonshrinking mortar and the binder. It turns out that the degree is desirable.

If the amount of the binder is less than 3% by weight, the formability is deteriorated, the shape retention as a molded body is also inferior, and it is liable to be damaged during small transportation at a construction site, which is preferable. Absent. Comparative Example 6

For comparison, ultra-fast hardening non-shrink mortar (trade name Filcon S Premix; manufactured by Sumitomo Osaka Cement Co., Ltd.) was kneaded with the amount of water shown in Table 6 above (for the original usage method). In accordance with that), fresh mortar was manufactured.

Test example 4

(Strength development after curing)

The fresh moles obtained in Example 4 and Comparative Example 6 were molded and solidified into a cylindrical test piece having a diameter of 50 × 100 mm in height and were kept in air until a material age of 28 days. After curing, the compressive strength was measured.

Table 7 shows the results. Table 7

Example 4

Comparative example of

Example 4 Comparative Example 6

Against 6

Specific strength

Ultra-fast hardening non-shrink mortar (abbreviated as FS)

90 100 quantity (kg)

Amount of binder (abbreviated as B) (kg) 10 0 Amount of kneading water (abbreviated as W) (kg) 17 18 Water Ratio with ultra-fast hardening non-shrink mortar

18.9 18.0 rate (W / FS X 100,%)

Compressive strength at age 3 hours (N / mm ² ) 13 0.87 15 Compressive strength at age 1 day (N / mm ² ) 48 0.94 51 Compressive strength according to age 3 (N / mm ² ) 53 0.93 57 Compressive strength at 7 days of age (N / mm ² ) 54 0.93 58 Compressive strength at 28 days of age (N / mm ² ) 56 0.92 61 Compressive strength at 91 days of age (N / mm ² ) 64 0.96 67 However, the compressive strength was measured according to the Japan Highway Public Corporation test method JHS 3 12-1992 “Quality control test method for non-shrink mortar”.

As shown in Table 7, the specific strength of the mortar product of the present invention was less than 90% of that of the conventional mortar premix product at the short-term strength of 3 hours at the age of 3 hours. It can be seen that they exhibit almost the same strength. In addition, it can be seen that even at the long-term age of 91 days, stable strength elongation and maintenance are shown.

It was also confirmed that a mortar product using the unhydrated molded article of the present invention obtained by the injection molding method had the same effect. Industrial applicability

'' The unhydrated molded article of the present invention can easily and solidify the powder of the hydraulic composition into a desired shape, and can be used both in the distribution state and in the working environment in which it is used. It does not generate dust, keeps the environment in very good condition, prevents weathering, enables long-term storage, and can be easily disintegrated when used, so water-stopping material, crack injection material, static crushing It can be used for various purposes such as materials, various mold premix products, various concrete premix products, various filling materials and backfilling materials.

Claims

Scope of request

1. An unhydrated molded product of a hydraulic composition, comprising a hydraulic composition and a binder.

2. The unhydrated molded article of the hydraulic composition according to claim 1, wherein the hydraulic composition and the binder are in a weight ratio of 50:50 to 95: 5: 5 parts by weight. An unhydrated molded article of a hydraulic composition, characterized by being contained in:

3. An unhydrated molded product of the hydraulic composition according to claim 1 or 2, wherein the binder is a water-soluble and thermoplastic polymer compound. Unhydrated molded body of hydraulic composition.

4. In producing an unhydrated molded body of the hydraulic composition according to any one of claims 1 to 3, the binder and the hydraulic composition are softened by softening the binder. A method for producing an unhydrated molded body of a hydraulic composition, characterized in that the molded body is heated to a temperature equal to or higher than the temperature, kneaded, molded, and then cooled to form a molded body.

5. The method for producing an unhydrated molded body of a hydraulic composition according to claim 4, wherein the binder is heated to a temperature equal to or higher than the softening point of the binder to be in a liquid state, A method for producing an unhydrated molded product of a hydraulic composition, which comprises mixing and kneading a kneadable composition, followed by injection molding while maintaining the temperature.

6. In producing an unhydrated molded article of the hydraulic composition according to claim 4, the hydraulic composition is mixed with a binder, A method for producing an unhydrated molded product of a hydraulic composition, comprising heating the mixture to a temperature equal to or higher than the softening point of the binder, kneading the mixture, and extruding the mixture.

7. Unhydrated hydraulic composition used by adding water to an unhydrated molded article of the hydraulic composition according to any one of claims 1 to 3 and curing the molded article. How to use the molded body.

8. The method for using an unhydrated molded product of the hydraulic composition according to claim 7, wherein the unhydrated molded product of the hydraulic composition is filled and applied to a surface of a crack of the structure. Unhydrated molding of a hydraulic composition, characterized in that the unhydrated molded body is used as a crack filler for filling the inside of the crack with the crack injection material and repairing the crack. How to use the body.