CA1331632C - Cement composition - Google Patents
Cement compositionInfo
- Publication number
- CA1331632C CA1331632C CA 611693 CA611693A CA1331632C CA 1331632 C CA1331632 C CA 1331632C CA 611693 CA611693 CA 611693 CA 611693 A CA611693 A CA 611693A CA 1331632 C CA1331632 C CA 1331632C
- Authority
- CA
- Canada
- Prior art keywords
- slurry
- silica
- cement component
- cement
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
- C04B7/326—Calcium aluminohalide cements, e.g. based on 11CaO.7Al2O3.CaX2, where X is Cl or F
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
- C04B40/0641—Mechanical separation of ingredients, e.g. accelerator in breakable microcapsules
- C04B40/065—Two or more component mortars
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/32—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
ABSTRACT OF THE DISCLOSURE:
In a composition to form a hardened cement (the composition comprising two slurries to be mixed together) selection of a specific phase for the first slurry leads to certain advantages in terms of cost and efficiency. To achieve this, the first slurry in chosen to comprise water and a cement component comprising ferrite and C12A7 or C11A7CX2 (where X is a halogen atom) and a reactive source of silica, while the second slurry comprises water, beta anhydrite, calcium oxide and/or calcium hydroxide.
In a composition to form a hardened cement (the composition comprising two slurries to be mixed together) selection of a specific phase for the first slurry leads to certain advantages in terms of cost and efficiency. To achieve this, the first slurry in chosen to comprise water and a cement component comprising ferrite and C12A7 or C11A7CX2 (where X is a halogen atom) and a reactive source of silica, while the second slurry comprises water, beta anhydrite, calcium oxide and/or calcium hydroxide.
Description
FTl8 CEMENT COMPOSITION 1 33 1 63~
The invention relates to a cement composition and in particular to such a composition for use in the production of concrete like materials for filling cavities in underground mines and like purposes. Compositions of the invention comprise two slurries to be mixed together. The invention is based on the realisation that by selecting specific phases for the cement component of one slurry certain advantages result in terms of cost and efficiency.
According to one aspect of the invention there is provided a composition to form a hardened cement, the composition comprising two slurries to be mixed together, the first slurry comprising water and a cement component comprising ferrite and Cl2A7 or CllA7CX2 (where X is a halogen atom) and a reactive source of silica, and the second slurry comprising water, beta anhydrite, calcium oxide and/or calcium hydroxide.
The cement phase of the first slurry comprises a mixture of ferrite, ("C4AF") and Cl2A7 (these formulae are in cement industry nomenclature). As will be well known to those skilled in the art, the term ferrite embraces other phases based on C2 (,A F), as well as C4AF. The presence of ferrite is beneficial becauee it is less reactive than the Cl2A7 phase which gives the advantage of requiring less of a~retarding agent to inhibit fast setting of~ the adm1xed s1urries. Other cement phases typical of high~alumina cements can be present and examples include CA, C2AS, C2S, Klein's compound and phases containing FeO or FeO
itself. The èrrite~a~d Cl2Ai7 preferabIy make up about 50%, most preferably 65% to 85% by weight of the cement component. The Cl2A7 may be replaced~by C1lA7CX2 where X is a halogen atom. The cement component will be~made from a mineral clinker in known manner.
The reactive source of ~silica is preferably a ground granulated blast furnace slag. The blast furnace slag may be of any known type and derived from any source. The i:
~`,`' :~:
~ 33 ~ 63~
FOSROC I~lERNATIO~AL LIMIl~D ~~ F~18 - -particle size may vary widely but should be related to that of the particles of the cement component. Preferably the slag has a specific surface area of about 3000 to about 6000 cm2/g. ~he reactive source of silica may be provided by other ingredients in whole or in part such as pozzolans, pulverised fly ash, silica fume or other glassy mixtures of lime and silica. ;`-, The reactive source of silica is preferably present in a welght ratio of 0.1 to 0.6 silica source per 1 part cement component. Sufficient should be present to ensure that -~
strength regression does not occur a~ter admixture of the -two slurries. If more of the reactive source of silica is present, the strength of admixture will be too low to :. :
` provide early pack support for an underground road.
.~ , `~ It is preferred to add a retarding/suspending system to the first slurry. Suitable retarders include polysaccharides, glucose, fructose, laotose, sucrose and the like. Suitable i~ suspending agents include cellulose ethers, polymers such as ` . j ., , ., . f, , ,1 , . ! . , polyacrylamides and polyethylene oxides and polyacrylates;
gums such as guar gum, xanthan gum or gum acacia; starch, hectorite, bentonite, attapulgite and the like.
~ ~, . ~ .
FOSROC I~TER~ATIOMA~ ~IMI~D 1331 632 ~T18 It iS essential that the second slurry contains calcium sulphate in the form of beta anhydrite becau9e other forms of calcium 9ulphate when used alone do not give satiSfactory result9. Hydrated forms sUch as Plaster of Paris or gypsum both give strengths which are too low during the initial stages of the setting process and gamma-anhydrite hydrates very rapidly in water and gives similar results ~to the - hydrated forms.
~ The beta anhydrite is preferably present in the second i slurry so that when the slurries are mixed it will be present relative to the cement component in a ratio of from ~' 3:7 to 4:1 by weight.
':
It iS es9ential to include calcium oxide and/or calcium ~` hydroxide to ensure that the maximum quantity of ettringite possible iS formed.
~ 10~0rd-r to obtain s-:t~Lcient1y rap1d and suffi~1ently high i~c~ early strength development (a minimum of the order of 0.35 M~m~2~afte'r 2~ho~rs'is'désirable) together with hi~h` ,;
ult~imate~5trength deve,10pme~nt when the oement composition ;has~fully hardened, care~should~be taken in selecting the quantity~of oalcium cxide~cr oalcium~hydroxide which is used.~ Toc~ ttle results in inadequate strength development : ' . ...
~O~ROC IN~ER~ATIONA~ ~IMITED 1 33 1 6 32 F~18 but it i9 also possible to add too much with the result that the streneth after one week is poor. The quantity used will be dependent on the quantity and nature of each o~ the other constituents which is present but in general good results are obtained when the quantity of calcium oxide and/or calcium hydroxide is from about 4 to about 8% by weight based on the wei~ht of the cement component. The calcium oxide may be incorporated as such or as a latent source o~
lime such as ~rdinary Portland cement.
:~ :
i In addition to the beta anhydrite it may be desirable to ; include a proportion of a suitable partially water soluble ;~ calcium sulphate such as gypsum (CaS042~20), or he~ihydrate (CaSO41/2H20), in order to increase the strength developed by the composition. The quantity of such calcium sulphate is preferably in the range of about 1 to about 6% by weight.
',t~, ~ ~ ' ~ The slurries may include other known additives such as `~ accelerators of which sodium carbonate in a weight ratio of about 0.~5~to about '!3% Irelative to the cement~component is an example.
; In praotice, the slurries are usually required to be pumped and the nature of the ingredients and the water:solids , ~
.:
~, ~OSROC I~R~A~IONA~ LIMI~ED 133 1 632 FT18 ratios are selected so that the slurries can have a vi9c09ity such that they can be pumped for a period exceeding about two hour9, preferably about 12 hour9 after admixture.
According to a further feature of the invention, there is provided a method of producing a hardened cement containing ettringite comprising mixing the slurries defined above and allowing the mixture to harden.
In carrying out the above method it is desirable to include `~
a bentonite clay in the second slurry as a suspension agent, `
both for the components of the second 81urry and for the whole composition when the two slurries are mixed together. `;
Usuallg the quantity of bentonite used will~be ln the range of~from ~1~0.0 to 25.0~ by weight ba9ed on the weight of beta ~;~
anhydr;ite present~. It~may~also be desirable~to include in the~`second~slurry~a~proportlon;of a known accelerating agent for~cemènts~suoh~ as~ thlum ca~rbonate 1n order to increase ;~
the rate of strength development during the early stages of the hardening procesS when the two slurries ~re mixed tcgether~ he~quantity~ cf~1ithium carOonate is preferably up to 0.5 bV w igh' b~d~on~the wel~ht of cement component.
$
.
~ , ~ -1331~32 FOSROC I~TERNATIONAL ~IMIT~D , F~18 ~he present invention includes a dry powder comprising a cement component comprising at least one cement phase which has a C:A ratio greater than unity and a reactive source of silica, the cement phase being preferably ferrite and/or C12A7; and a slurry comprising the dry powder and water.
In order that the invention may be well understood it will now be described with reference to the following example in which parts are by weight unless otherwise specified.
~xample : :
A first powder was made by mixing together:
a high alumina ~` ~ cement comprising ~x~
`;~" the following phases ~ ~ (normal-sed to 100~) ~; .
~,,~. .
Ferrite 54) CA ~ 233 ! 80.00, 12A7 14) C2AS 9) ~ ~ .
ground granulated blast furnace slag 20.00 ~ .
. ,;
` To this mixture was added 2.75 parts of a retardlng/suspending system. ~ -FOSROC I~TER~ATIONA~ ~IMIT~D 1 3 3 1 6 32 FT18 A second powder was made by mixing together:
beta anhydrite 74.75 sodium bentonite 10.00 calcium oxide 6.0 pulverised fly ash 5.0 calcium 9ulphate dihydrate~.0 sodium carbonate 1.0 lithium carbonate 0.25 ~ach powder was thoroughly mixed with water at 20C in a water:solids ratio of 2.5:1 to form a slurry. After 5 minutes the two slurries were intermixed by pouring from one buckeb to a~other six bimes. ~he mixed slurri~es were then poured into insulated 100 mm cube moulds to 8imulate ;~
underground cur~ing condiL:tions.
A;c~m~crat-ve~mixbure~w&= made~up u=lng~the eame slurrles but followlng the~ b~each~ing according~to~GB patent 2l23808 B
but~;including 20 ~parts~ relat~ive to the HAC of the~blast furnace slag used above. The HAC comprised (normalised to ~:~
CA ~ 46;
Ferribe~ 23~
C~2A7~ 20 -~ -; FOSROC IN~ERNATIONA~ LIMITED 1 33 1 6 32 FT18 ~he cubes from both slurries were then tested for comparative strengths and the following results were obtained:
Present invention GB 2123808 _.
(& 20 ~arts slag) 2 hours 1.29 0.65 24 hours 4.16 1.63 7 days 4.73 3.57 ~, .
~ hese results show that by modifying the cement component '` and adding a reactive source of silica an acceptable rate of strength development is obtained. When, however, the reactive source of silica is added to an HAC in the system .
of the earlier patent no such rate of strength development . occurs.
''~`` ~ ~ : ' -~`~;,: ' :
1"~`~: ` :
The invention relates to a cement composition and in particular to such a composition for use in the production of concrete like materials for filling cavities in underground mines and like purposes. Compositions of the invention comprise two slurries to be mixed together. The invention is based on the realisation that by selecting specific phases for the cement component of one slurry certain advantages result in terms of cost and efficiency.
According to one aspect of the invention there is provided a composition to form a hardened cement, the composition comprising two slurries to be mixed together, the first slurry comprising water and a cement component comprising ferrite and Cl2A7 or CllA7CX2 (where X is a halogen atom) and a reactive source of silica, and the second slurry comprising water, beta anhydrite, calcium oxide and/or calcium hydroxide.
The cement phase of the first slurry comprises a mixture of ferrite, ("C4AF") and Cl2A7 (these formulae are in cement industry nomenclature). As will be well known to those skilled in the art, the term ferrite embraces other phases based on C2 (,A F), as well as C4AF. The presence of ferrite is beneficial becauee it is less reactive than the Cl2A7 phase which gives the advantage of requiring less of a~retarding agent to inhibit fast setting of~ the adm1xed s1urries. Other cement phases typical of high~alumina cements can be present and examples include CA, C2AS, C2S, Klein's compound and phases containing FeO or FeO
itself. The èrrite~a~d Cl2Ai7 preferabIy make up about 50%, most preferably 65% to 85% by weight of the cement component. The Cl2A7 may be replaced~by C1lA7CX2 where X is a halogen atom. The cement component will be~made from a mineral clinker in known manner.
The reactive source of ~silica is preferably a ground granulated blast furnace slag. The blast furnace slag may be of any known type and derived from any source. The i:
~`,`' :~:
~ 33 ~ 63~
FOSROC I~lERNATIO~AL LIMIl~D ~~ F~18 - -particle size may vary widely but should be related to that of the particles of the cement component. Preferably the slag has a specific surface area of about 3000 to about 6000 cm2/g. ~he reactive source of silica may be provided by other ingredients in whole or in part such as pozzolans, pulverised fly ash, silica fume or other glassy mixtures of lime and silica. ;`-, The reactive source of silica is preferably present in a welght ratio of 0.1 to 0.6 silica source per 1 part cement component. Sufficient should be present to ensure that -~
strength regression does not occur a~ter admixture of the -two slurries. If more of the reactive source of silica is present, the strength of admixture will be too low to :. :
` provide early pack support for an underground road.
.~ , `~ It is preferred to add a retarding/suspending system to the first slurry. Suitable retarders include polysaccharides, glucose, fructose, laotose, sucrose and the like. Suitable i~ suspending agents include cellulose ethers, polymers such as ` . j ., , ., . f, , ,1 , . ! . , polyacrylamides and polyethylene oxides and polyacrylates;
gums such as guar gum, xanthan gum or gum acacia; starch, hectorite, bentonite, attapulgite and the like.
~ ~, . ~ .
FOSROC I~TER~ATIOMA~ ~IMI~D 1331 632 ~T18 It iS essential that the second slurry contains calcium sulphate in the form of beta anhydrite becau9e other forms of calcium 9ulphate when used alone do not give satiSfactory result9. Hydrated forms sUch as Plaster of Paris or gypsum both give strengths which are too low during the initial stages of the setting process and gamma-anhydrite hydrates very rapidly in water and gives similar results ~to the - hydrated forms.
~ The beta anhydrite is preferably present in the second i slurry so that when the slurries are mixed it will be present relative to the cement component in a ratio of from ~' 3:7 to 4:1 by weight.
':
It iS es9ential to include calcium oxide and/or calcium ~` hydroxide to ensure that the maximum quantity of ettringite possible iS formed.
~ 10~0rd-r to obtain s-:t~Lcient1y rap1d and suffi~1ently high i~c~ early strength development (a minimum of the order of 0.35 M~m~2~afte'r 2~ho~rs'is'désirable) together with hi~h` ,;
ult~imate~5trength deve,10pme~nt when the oement composition ;has~fully hardened, care~should~be taken in selecting the quantity~of oalcium cxide~cr oalcium~hydroxide which is used.~ Toc~ ttle results in inadequate strength development : ' . ...
~O~ROC IN~ER~ATIONA~ ~IMITED 1 33 1 6 32 F~18 but it i9 also possible to add too much with the result that the streneth after one week is poor. The quantity used will be dependent on the quantity and nature of each o~ the other constituents which is present but in general good results are obtained when the quantity of calcium oxide and/or calcium hydroxide is from about 4 to about 8% by weight based on the wei~ht of the cement component. The calcium oxide may be incorporated as such or as a latent source o~
lime such as ~rdinary Portland cement.
:~ :
i In addition to the beta anhydrite it may be desirable to ; include a proportion of a suitable partially water soluble ;~ calcium sulphate such as gypsum (CaS042~20), or he~ihydrate (CaSO41/2H20), in order to increase the strength developed by the composition. The quantity of such calcium sulphate is preferably in the range of about 1 to about 6% by weight.
',t~, ~ ~ ' ~ The slurries may include other known additives such as `~ accelerators of which sodium carbonate in a weight ratio of about 0.~5~to about '!3% Irelative to the cement~component is an example.
; In praotice, the slurries are usually required to be pumped and the nature of the ingredients and the water:solids , ~
.:
~, ~OSROC I~R~A~IONA~ LIMI~ED 133 1 632 FT18 ratios are selected so that the slurries can have a vi9c09ity such that they can be pumped for a period exceeding about two hour9, preferably about 12 hour9 after admixture.
According to a further feature of the invention, there is provided a method of producing a hardened cement containing ettringite comprising mixing the slurries defined above and allowing the mixture to harden.
In carrying out the above method it is desirable to include `~
a bentonite clay in the second slurry as a suspension agent, `
both for the components of the second 81urry and for the whole composition when the two slurries are mixed together. `;
Usuallg the quantity of bentonite used will~be ln the range of~from ~1~0.0 to 25.0~ by weight ba9ed on the weight of beta ~;~
anhydr;ite present~. It~may~also be desirable~to include in the~`second~slurry~a~proportlon;of a known accelerating agent for~cemènts~suoh~ as~ thlum ca~rbonate 1n order to increase ;~
the rate of strength development during the early stages of the hardening procesS when the two slurries ~re mixed tcgether~ he~quantity~ cf~1ithium carOonate is preferably up to 0.5 bV w igh' b~d~on~the wel~ht of cement component.
$
.
~ , ~ -1331~32 FOSROC I~TERNATIONAL ~IMIT~D , F~18 ~he present invention includes a dry powder comprising a cement component comprising at least one cement phase which has a C:A ratio greater than unity and a reactive source of silica, the cement phase being preferably ferrite and/or C12A7; and a slurry comprising the dry powder and water.
In order that the invention may be well understood it will now be described with reference to the following example in which parts are by weight unless otherwise specified.
~xample : :
A first powder was made by mixing together:
a high alumina ~` ~ cement comprising ~x~
`;~" the following phases ~ ~ (normal-sed to 100~) ~; .
~,,~. .
Ferrite 54) CA ~ 233 ! 80.00, 12A7 14) C2AS 9) ~ ~ .
ground granulated blast furnace slag 20.00 ~ .
. ,;
` To this mixture was added 2.75 parts of a retardlng/suspending system. ~ -FOSROC I~TER~ATIONA~ ~IMIT~D 1 3 3 1 6 32 FT18 A second powder was made by mixing together:
beta anhydrite 74.75 sodium bentonite 10.00 calcium oxide 6.0 pulverised fly ash 5.0 calcium 9ulphate dihydrate~.0 sodium carbonate 1.0 lithium carbonate 0.25 ~ach powder was thoroughly mixed with water at 20C in a water:solids ratio of 2.5:1 to form a slurry. After 5 minutes the two slurries were intermixed by pouring from one buckeb to a~other six bimes. ~he mixed slurri~es were then poured into insulated 100 mm cube moulds to 8imulate ;~
underground cur~ing condiL:tions.
A;c~m~crat-ve~mixbure~w&= made~up u=lng~the eame slurrles but followlng the~ b~each~ing according~to~GB patent 2l23808 B
but~;including 20 ~parts~ relat~ive to the HAC of the~blast furnace slag used above. The HAC comprised (normalised to ~:~
CA ~ 46;
Ferribe~ 23~
C~2A7~ 20 -~ -; FOSROC IN~ERNATIONA~ LIMITED 1 33 1 6 32 FT18 ~he cubes from both slurries were then tested for comparative strengths and the following results were obtained:
Present invention GB 2123808 _.
(& 20 ~arts slag) 2 hours 1.29 0.65 24 hours 4.16 1.63 7 days 4.73 3.57 ~, .
~ hese results show that by modifying the cement component '` and adding a reactive source of silica an acceptable rate of strength development is obtained. When, however, the reactive source of silica is added to an HAC in the system .
of the earlier patent no such rate of strength development . occurs.
''~`` ~ ~ : ' -~`~;,: ' :
1"~`~: ` :
Claims (14)
1. A composition to form a hardened cement, the composition comprising two slurries to be mixed together, the first slurry comprising water, a reactive source of silica and a cement component, the cement component comprising the phases ferrite and C12A7 or C11A7CX2 (where X is a halogen atom), the phases making up at least 50% by weight of the cement component; the reactive source of silica being present in a weight ratio of 0.1 to 0.6:1 of the cement component; and the second slurry comprising water, beta anhydrite, and a calcium compound selected from the group consisting of calcium oxide and calcium hydroxide.
2. A composition according to Claim 1, wherein the ferrite and C12A7 or C11A7CX2 make up 65 to 85% by weight of the cement component of the first slurry.
3. A composition according to Claim 1, wherein the reactive source of silica in the first slurry is selected from the group of a blast furnace slag, a pozzolan, pulverised fly ash, silica fume or glass mixtures of lime and silica.
4. A composition according to Claim 1, wherein the quantity of the calcium compound selected from the group of calcium oxide and hydroxide in the second slurry is from about 4%
to about 8% by weight of the cement component.
to about 8% by weight of the cement component.
5. A composition according to Claim 1, wherein the second slurry contains about 1% to about 6% of a partially water soluble calcium sulphate.
6. A composition according to Claim 1, wherein the second slurry contains 10% to 25% by weight relative to the beta anhydrite of a bentonite clay.
7. A dry powder formulation comprising a reactive source of silica and a cement component consisting essentially of ferrite and C12A7 or ferrite and C11A7CX2 (where X is a halogen atom), the reactive source of silica being present in a weight ratio of 0.1 to 0.6:1 of the cement component.
8. A method of forming a hardened cement, the method comprising mixing together first and second slurries, the first slurry comprising water, a reactive source of silica and a cement component comprising the phases ferrite and C12A7 or C11A7CX2 (where X is a halogen atom) the phases making up at least 50% of the cement component, the second slurry comprising water, beta anhydrite, and a calcium compound selected from the group consisting of calcium oxide and calcium hydroxide, and allowing the mixture of the two slurries to harden.
9. A method according to Claim 8, wherein the ferrite and C12A7 make up 65 to 85% by weight of the cement component.
10. A method according to Claim 8, wherein the reactive source of silica is selected from the group of a blast furnace slag, a pozzolan, pulverised fly ash, silica fume or glass mixtures of lime and silica.
11. A method according to Claim 8, wherein the reactive source of silica is present in the first slurry in a weight ratio of 0.1 to 0.6:1 of the cement component.
12. A method according to Claim 8, wherein the quantity of the calcium compound selected from the group of calcium oxide and hydroxide in the second slurry is from about 4% to about 8% by weight of the cement component.
13. A method according to Claim 8, wherein the second slurry contains about 1% to about 6% of a partially water soluble calcium sulphate.
14. A method according to Claim 8, wherein the second slurry contains 10% to 25% by weight relative to the beta anhydrite of a bentonite clay.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8822060 | 1988-09-20 | ||
| GB8822060A GB2223488B (en) | 1988-09-20 | 1988-09-20 | Cement compositions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1331632C true CA1331632C (en) | 1994-08-23 |
Family
ID=10643915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 611693 Expired - Fee Related CA1331632C (en) | 1988-09-20 | 1989-09-18 | Cement composition |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US5096497A (en) |
| EP (1) | EP0396671A1 (en) |
| AU (1) | AU624430B2 (en) |
| BR (1) | BR8907093A (en) |
| CA (1) | CA1331632C (en) |
| GB (1) | GB2223488B (en) |
| IN (1) | IN176280B (en) |
| WO (1) | WO1990003346A1 (en) |
| ZA (1) | ZA897181B (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5858083A (en) * | 1994-06-03 | 1999-01-12 | National Gypsum Company | Cementitious gypsum-containing binders and compositions and materials made therefrom |
| US5624489A (en) * | 1995-01-23 | 1997-04-29 | National Research Council Of Canada | Conversion-preventing additive for high alumina cement products |
| US5718759A (en) * | 1995-02-07 | 1998-02-17 | National Gypsum Company | Cementitious gypsum-containing compositions and materials made therefrom |
| FR2741062B1 (en) * | 1995-11-10 | 1998-05-07 | Electricite De France | GROUND INJECTION IN PARTICULAR UNDER LOW PRESSURE AND PRODUCT FOR ITS PREPARATION |
| IT1283165B1 (en) * | 1996-07-17 | 1998-04-07 | Italcementi Spa | RAPID CONCRETE CONTAINING CLINKER BASED ON CALCIUM FLUORALUMINATE MIXED WITH LIME |
| US6394707B1 (en) | 1997-05-08 | 2002-05-28 | Jack Kennedy Metal Products & Buildings, Inc. | Yieldable mine roof support |
| ES2154571B1 (en) * | 1998-10-26 | 2001-11-16 | Consejo Superior Investigacion | OBTAINING MATERIALS EQUIPPED WITH MECHANICAL RESISTANCE AND LOW LEVELABILITY OBTAINED FROM MINING AND INDUSTRIAL WASTE. |
| US6758896B2 (en) | 1999-04-16 | 2004-07-06 | Hassan Kunbargi | Rapid hardening, ultra-high early strength portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions |
| US6113684A (en) * | 1999-04-16 | 2000-09-05 | Kunbargi; Hassan | Rapid hardening, ultra-high early strength Portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions |
| US6406534B1 (en) | 1999-04-16 | 2002-06-18 | Hassan Kunbargi | Rapid hardening, ultra-high early strength portland-type cement compositions, novel clinkers and methods for their manufacture which reduce harmful gaseous emissions |
| US6258160B1 (en) * | 1999-09-07 | 2001-07-10 | Halliburton Energy Services, Inc. | Methods and compositions for grouting heat exchange pipe |
| KR100466947B1 (en) * | 2002-09-26 | 2005-01-24 | 한일콘(주) | Polymer mortar and method repair or supplementary concrete |
| CN1232465C (en) * | 2002-12-24 | 2005-12-21 | 清华大学 | binary mixed coagulated stones and wet cement and method for production, deposit, transportation use and application |
| US20080202415A1 (en) * | 2007-02-28 | 2008-08-28 | David Paul Miller | Methods and systems for addition of cellulose ether to gypsum slurry |
| US8627769B2 (en) * | 2010-04-23 | 2014-01-14 | Minova International Limited | Cementitious compositions |
| US8413584B2 (en) | 2010-04-23 | 2013-04-09 | Minova International Limited | Cementitious compositions |
| CA3170961A1 (en) * | 2020-03-13 | 2021-09-16 | Anne Daubresse | Slag-based hydraulic binder, dry mortar composition comprising same and system for activating a slag-based binder |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT385731B (en) * | 1940-10-30 | 1941-03-18 | ||
| JPS5546983B2 (en) * | 1972-03-31 | 1980-11-27 | ||
| US4012264A (en) * | 1972-08-16 | 1977-03-15 | The Associated Portland Cement Manufacturers Limited | Early strength cements |
| GB1497670A (en) * | 1974-12-09 | 1978-01-12 | Ass Portland Cement | Early strength cements |
| US4157263A (en) * | 1977-04-14 | 1979-06-05 | U.S. Grout Corporation | Cementitious compositions having fast-setting properties and inhibited shrinkage |
| GB2123808B (en) * | 1982-06-24 | 1986-04-23 | Foseco Int | Cement compositions |
| US4488909A (en) * | 1983-11-25 | 1984-12-18 | United States Gypsum Company | Non-expansive, rapid setting cement |
| GB2159512B (en) * | 1984-06-01 | 1987-10-21 | Blue Circle Ind Plc | Cement compositions for stowing cavities |
| CN85108582B (en) * | 1984-10-30 | 1988-08-17 | 蓝圈工业有限公司 | Settable cementitious compositions |
| GB2177389A (en) * | 1985-07-01 | 1987-01-21 | Mitsubishi Mining & Cement Co | Filling and solidifying grout slurry in coal pit |
| IN168168B (en) * | 1986-04-10 | 1991-02-16 | Fosroc International Ltd | |
| GB2188923B (en) * | 1986-04-10 | 1991-06-19 | Fosroc International Ltd | Cementitious composition |
| US4961787A (en) * | 1987-10-15 | 1990-10-09 | National Reserach Development Corporation | Cement composition |
| GB8725385D0 (en) * | 1987-10-29 | 1987-12-02 | Fosroc International Ltd | Cementitious composition |
| US5073197A (en) * | 1988-08-12 | 1991-12-17 | National Research Development Corporation | Cement compositions |
| US4957556A (en) * | 1989-06-08 | 1990-09-18 | Hassan Kunbargi | Very early setting ultra high early strength cement |
-
1988
- 1988-09-20 GB GB8822060A patent/GB2223488B/en not_active Expired - Lifetime
-
1989
- 1989-09-14 US US07/476,372 patent/US5096497A/en not_active Expired - Fee Related
- 1989-09-14 BR BR8907093A patent/BR8907093A/en unknown
- 1989-09-14 WO PCT/GB1989/001078 patent/WO1990003346A1/en not_active Application Discontinuation
- 1989-09-14 AU AU43247/89A patent/AU624430B2/en not_active Ceased
- 1989-09-14 EP EP89910901A patent/EP0396671A1/en not_active Ceased
- 1989-09-18 IN IN836DE1989 patent/IN176280B/en unknown
- 1989-09-18 CA CA 611693 patent/CA1331632C/en not_active Expired - Fee Related
- 1989-09-20 ZA ZA897181A patent/ZA897181B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990003346A1 (en) | 1990-04-05 |
| US5096497A (en) | 1992-03-17 |
| ZA897181B (en) | 1990-06-27 |
| GB2223488B (en) | 1992-04-15 |
| AU4324789A (en) | 1990-04-18 |
| BR8907093A (en) | 1991-01-08 |
| AU624430B2 (en) | 1992-06-11 |
| GB2223488A (en) | 1990-04-11 |
| GB8822060D0 (en) | 1988-10-19 |
| IN176280B (en) | 1996-03-30 |
| EP0396671A1 (en) | 1990-11-14 |
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| MKLA | Lapsed |