WO2006043265A2 - Retardation of hydration of cementitous slurry - Google Patents
Retardation of hydration of cementitous slurry Download PDFInfo
- Publication number
- WO2006043265A2 WO2006043265A2 PCT/IL2005/001071 IL2005001071W WO2006043265A2 WO 2006043265 A2 WO2006043265 A2 WO 2006043265A2 IL 2005001071 W IL2005001071 W IL 2005001071W WO 2006043265 A2 WO2006043265 A2 WO 2006043265A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slurry
- acrylic polymer
- base material
- aquous
- polymer base
- Prior art date
Links
- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 28
- 230000036571 hydration Effects 0.000 title description 8
- 239000000463 material Substances 0.000 claims abstract description 34
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 26
- 230000000979 retarding effect Effects 0.000 claims abstract description 7
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 24
- 239000004568 cement Substances 0.000 claims description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052602 gypsum Inorganic materials 0.000 claims description 7
- 239000010440 gypsum Substances 0.000 claims description 7
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910052925 anhydrite Inorganic materials 0.000 claims description 5
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 5
- RDJLIBMVLWBMKX-UHFFFAOYSA-N 1-(3,4-dihydro-2h-chromen-2-ylmethyl)piperidine Chemical compound C1CC2=CC=CC=C2OC1CN1CCCCC1 RDJLIBMVLWBMKX-UHFFFAOYSA-N 0.000 claims description 4
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 4
- 239000004281 calcium formate Substances 0.000 claims description 4
- 229940044172 calcium formate Drugs 0.000 claims description 4
- 235000019255 calcium formate Nutrition 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- 150000004676 glycans Chemical class 0.000 claims description 4
- 229920001519 homopolymer Polymers 0.000 claims description 4
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 claims description 4
- 229920001282 polysaccharide Polymers 0.000 claims description 4
- 239000005017 polysaccharide Substances 0.000 claims description 4
- CHKVPAROMQMJNQ-UHFFFAOYSA-M potassium bisulfate Chemical compound [K+].OS([O-])(=O)=O CHKVPAROMQMJNQ-UHFFFAOYSA-M 0.000 claims description 4
- 229910000343 potassium bisulfate Inorganic materials 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 235000019698 starch Nutrition 0.000 claims description 4
- 239000008107 starch Substances 0.000 claims description 4
- 239000000084 colloidal system Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 3
- 229940008015 lithium carbonate Drugs 0.000 claims description 3
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 3
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 claims description 3
- 229910000342 sodium bisulfate Inorganic materials 0.000 claims description 3
- 229940001593 sodium carbonate Drugs 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 230000006266 hibernation Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- -1 INIaHSO4 Chemical compound 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- 241000518994 Conta Species 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000004117 Lignosulphonate Substances 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 235000019357 lignosulphonate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 239000003340 retarding agent Substances 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
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
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
-
- 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
- C04B40/0658—Retarder inhibited mortars activated by the addition of accelerators or retarder-neutralising agents
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
Definitions
- the invention relates to a process and composition for retardation of hydration reaction of cementitous slurry comprising calcium sulphate hemihydrate or cement.
- cementitous materials namely cement, gypsum and the like, are widely used in the construction industry. Typically these materials are available in solid powder form, and are mixed with water and additives to form slurry, which is then cast and allowed to harden.
- CSH calcium sulphate hemihydrate
- cement slurry typically hardens over a period of minutes to hours (with the use of retardant additives, su ch as tartaric acid, lignosulphonate, citric acid, sodium gluconate and other retarding agents.
- retardation of the hydration reaction of CSH may be prolonged to a number of hours, maybe up to several days
- a method for retarding hydration reaction in a cementitous aquous slurry, in which hydration reaction has not commenced yet comprising: mixing into the aquous slurry acrylic polymer base material, thereby substantially retarding commen cement of hydration reaction in the solution.
- the cementitious aquous slurry comprises calcium sulphate hemihydrate (CSH). Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is at least 0.1% in weight of the CSH.
- a condenser is added to the aquous solution.
- the condenser is selected from the group of condensers containing polysaccharide, starch ether.
- the cementitious aquous slurry comprises ce ment.
- acrylic polymer base material is in powder state Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is in liquid state.
- the acrylic polymer base material is a dispersant.
- the acrylic polymer is copolymer.
- the acrylic polymer base material is selected from the group containing: REOTAN L obtainable from Lamberti spa ), Ciba Dispex R50/A40/N40 (obtainable from Ciba), Dispex Nl OO (Allied Colloids), BEVALOID 66770 (PPMC).
- the acrylic polymer is homopolymer.
- the method further comprises adding accelrator into the aquous solution, thereby causing beginning of hydration reacti on.
- the accelerator is selected from the group of accelerators containing: KAI(SO 4 )2*12(H 2 O), gypsum (CaSO 4 . 2 H 2 O), K 2 CO 3 , NaHSO 4 , KHSO 4 , cement, calcium formate, sodium carbonate, lithiumcarbonate, calcium nitrate, calcium nitrite.
- a cementitious aquous slu rry in which hydration reaction is retarded, comprising acrylic polymer base material mixed homogeneously in the slurry.
- An aspect of the present invention is the provision of a process and composition for retardation of hydration of CSH and other cemeniteous slurry, using acrylic polymer base material in the slurry.
- the present invention is aimed at any cemeniteous material, such as cement, all kinds of "gypsum" Csuch as CSH including ⁇ -CSH or ⁇ -CSH) and the like.
- the inventors of the present invention have unexpectedly discovered that it is possible to retard hydration of cemeniteous materials in the form of aquous solution for substantially long time - in the order of months and even years, much longer than currently possible, rendering it effectively "dormant".
- the inventors of the present invention have discovered that the retarded aquous solution can be caused to harden in a very short time (typically in a matter of minutes), after a long period of storage in its "dormant" stage.
- ca lcium sulphate hemihydrate (CSH) base material in a liquid slurry form is a main raw material in the composition.
- the CSH aquous slurry also includes a conventional retardant (for preventing immediate hardening of the slurry), into which acrylic po lymer base material is mixed.
- a conventional retardant for preventing immediate hardening of the slurry
- acrylic po lymer base material is mixed.
- Other additives may be included in the composition of the present invention, without limiting the scope of the invention.
- the process includes the following main steps:
- CSH in a powder form is mixed with a common retard ant (preventing instantaneous commen cement of the hydration reaction, typically retarding it for a matter of a few minutes), such as Tartaric acid (typically using some 0.01 - 0.05% % by weight of the CSH, or mo re).
- a condenser agent may be used, such as starch ether, polysaccharide (typically using some 0.05 - 0.5% by weight of the CSH , or more).
- acrylic polymer base material in aqueous solution or in a solid state is added homogeneously mixed in the slurry, typically some 0.1 % by weight of the CSH, or more (the amount varies depending on the period of time it should be retarded and on the purity of the slurry). It is recommended to add a preservative, such as formalin, phenol or other preservative, to prevent cultivation of microorganisms in the slurry.
- a preservative such as formalin, phenol or other preservative
- the acrylic polymer base material may be for example selected from the following: REOTAN L obtainable from Lamberti spa ), Ciba Dispex R5O/A40/N40 (obtainable from Ciba), Dispex NlOO (Allied Colloi ds), BEVALOID 66770 (PPMC). These are all examples and do not constitute a closed group, as other acrylic polymer base materials may also be used.
- the acrylic polymer may be copolymer or homopolymer.
- the acrylic polymer base material is selected preferably also to be a dispersant.
- gypsum CaSO 4 • 2 H 2 O
- gypsum CaSO 4 • 2 H 2 O
- the aquous mixture is prepared it is stored in a closed container, preferably in a cool place, preferably making sure no air is in direct contact with the surface of the aquous mixture.
- Thi s may be achieved by covering the mixture by a nylon sheet or a similar protective impervious layer.
- an accelerator such as KAI(SO 4 ) 2 l2(H 2 O), gypsum (CaSO 4 • 2 H 2 O), K 2 CO 3 , INIaHSO 4 , KHSO 4 , cement, calcium formate, sodium carbonate, l ithiumcarbonate, calcium nitrate, calcium nitrite, or other accelerators is added and mixed into the aquous mixture, causing the hydration reaction to commence and thus in effect puling out the mixture from its "hibernation" state.
- the use of accelerators is recommended when the slurry is in a long hibernation state (more than a few days). In most cases, for short term hibernation (up to 2-3 days) accelerators are not necessary.
- This last stage is typically performed on site, where the cemeniteous material needs to be used (at a construction site or si milar locale).
- the advantage in the present invention is enourmous. It allows a factory regulated quality control rather than relaying on on-site mixing and preparation that is hard to standardize. Furthermore it facilitates a wide range of end-user products, aimed at simplifying construction and building, which means that the preparation stage, that was previously conducted solely on-site is much simpler and faster.
- the present invention allows manufacturing of ready-for-use materials also reduces health hazards, as the end user is less likely to be exposed to fine powder particles.
- the present invention also effectively reduces costs, as constructors will not have to bring mixing machines to the construction site (saving water, electricity and machinery). It should be clear that the description of the embodiments set forth in this specification serves only for a better understanding of the invention, without limiting its scope as covered by the following Claims.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A method for retarding hydration reaction in a cementitous aquous slurry, in which hydration reaction has not commenced yet, the method comprising: mixing into the aquous slurry acrylic polymer base material, thereby substantially retarding commencement of hydration reaction in the solution.
Description
RETARDATION OF HYDRATION OF CEMENTITOUS SLURRY
FIELD OF THE INVENTION
The invention relates to a process and composition for retardation of hydration reaction of cementitous slurry comprising calcium sulphate hemihydrate or cement.
BACKGROUND OF THE INVENTION
Cementitous materials, namely cement, gypsum and the like, are widely used in the construction industry. Typically these materials are available in solid powder form, and are mixed with water and additives to form slurry, which is then cast and allowed to harden.
CSH (calcium sulphate hemihydrate) slurry or cement slurry typically hardens over a period of minutes to hours (with the use of retardant additives, su ch as tartaric acid, lignosulphonate, citric acid, sodium gluconate and other retarding agents.
Conventionally, retardation of the hydration reaction of CSH may be prolonged to a number of hours, maybe up to several days
It is an object of the present invention to provide a process and compositi on for substantial retardation (in the order of months, and even years) of hydration of CSH and other cementitous aquous slurry.
Yet another object of the present invention is to provide a process and composition for retardation of hydration of CSH and other cemeniteous aquous slurry, which after a long "dormant" peri od may be rapidly hydrated (in the order of minutes or a few hours) and allowed to harden.
Other advantages and aspects of the present invention will become apparent after reading the present specification.
SUMMARY OF THE INVENTION
There is thus provided, in accordance with some preferred embodiments of the present invention, a method for retarding hydration reaction in a cementitous aquous slurry, in which hydration reaction has not commenced yet, the method comprising: mixing into the aquous slurry acrylic polymer base material, thereby substantially retarding commen cement of hydration reaction in the solution.
Furthermore, in accordance with some preferred embodiments of the present invention, the cementitious aquous slurry comprises calcium sulphate hemihydrate (CSH). Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is at least 0.1% in weight of the CSH.
Furthermore, in accordance with some preferred embodiments of the present invention, a condenser is added to the aquous solution. Furthermore, in accordance with some preferred embodiments of the present invention, the condenser is selected from the group of condensers containing polysaccharide, starch ether.
Furthermore, in accordance with some preferred embodiments of the present invention, the cementitious aquous slurry comprises ce ment.
Furthermore, in accordance with some preferred embodiments of the present invention, acrylic polymer base material is in powder state Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is in liquid state.
Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is a dispersant.
Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer is copolymer.
Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer base material is selected from the group containing: REOTAN L obtainable from Lamberti spa), Ciba Dispex R50/A40/N40 (obtainable from Ciba), Dispex Nl OO (Allied Colloids), BEVALOID 66770 (PPMC).
Furthermore, in accordance with some preferred embodiments of the present invention, the acrylic polymer is homopolymer.
Furthermore, in accordance with some preferred embodiments of the present invention, the method further comprises adding accelrator into the aquous solution, thereby causing beginning of hydration reacti on.
Furthermore, in accordance with some preferred embodiments of the present invention, the accelerator is selected from the group of accelerators containing: KAI(SO4)2*12(H2O), gypsum (CaSO4. 2 H2O), K2CO3, NaHSO4, KHSO4 , cement, calcium formate, sodium carbonate, lithiumcarbonate, calcium nitrate, calcium nitrite.
Furthermore, in accordance with some preferred embodiments of the present invention, there is provided a cementitious aquous slu rry, in which hydration
reaction is retarded, comprising acrylic polymer base material mixed homogeneously in the slurry.
DESCRIPTION OF PREFERRED EMBODIMENTS
An aspect of the present invention is the provision of a process and composition for retardation of hydration of CSH and other cemeniteous slurry, using acrylic polymer base material in the slurry. The present invention is aimed at any cemeniteous material, such as cement, all kinds of "gypsum" Csuch as CSH including α-CSH or β-CSH) and the like.
The inventors of the present invention have unexpectedly discovered that it is possible to retard hydration of cemeniteous materials in the form of aquous solution for substantially long time - in the order of months and even years, much longer than currently possible, rendering it effectively "dormant".
Furthermore, the inventors of the present invention have discovered that the retarded aquous solution can be caused to harden in a very short time (typically in a matter of minutes), after a long period of storage in its "dormant" stage.
According to a preferred embodiment of the present invention ca lcium sulphate hemihydrate (CSH) base material in a liquid slurry form is a main raw material in the composition.
The CSH aquous slurry also includes a conventional retardant (for preventing immediate hardening of the slurry), into which acrylic po lymer base material is mixed. Other additives may be included in the composition of the present invention, without limiting the scope of the invention.
In accordance with some preferred embodiments of the present invention, the process includes the following main steps:
First, CSH in a powder form is mixed with a common retard ant (preventing instantaneous commen cement of the hydration reaction, typically retarding it for a matter of a few minutes), such as Tartaric acid (typically using some 0.01 - 0.05% % by weight of the CSH, or mo re). Optionally a condenser agent may be used, such as starch ether, polysaccharide (typically using some 0.05 - 0.5% by weight of the CSH , or more). After mixing the solids into a homogeneous powder, water is added in mixing (the a mount of water varies, depending on the intended use of the specific product) to attain a homogeneous slurry.
After homogeneous slurry is achieved, and preferably after mixin g it for a few more minutes, acrylic polymer base material in aqueous solution or in a solid state, is added homogeneously mixed in the slurry, typically some 0.1 % by weight of the CSH, or more (the amount varies depending on the period of time it should be retarded and on the purity of the slurry). It is recommended to add a preservative, such as formalin, phenol or other preservative, to prevent cultivation of microorganisms in the slurry. The acrylic polymer base material may be for example selected from the following: REOTAN L obtainable from Lamberti spa), Ciba Dispex R5O/A40/N40 (obtainable from Ciba), Dispex NlOO (Allied Colloi ds), BEVALOID 66770 (PPMC). These are all examples and do not constitute a closed group, as other acrylic polymer base materials may also be used. The acrylic polymer may be copolymer or homopolymer.
The acrylic polymer base material is selected preferably also to be a dispersant.
During the preparation stages it is highly recommended to avoid any
contamination by any impurities, such as gypsum (CaSO4 • 2 H2O) that acts as an accelerator, and therefore hinders the retardation of the hydration reaction, or other such contaminants. It is therefore recommended to use clean mixing tools and take care not to conta minate the solution. After the aquous mixture is prepared it is stored in a closed container, preferably in a cool place, preferably making sure no air is in direct contact with the surface of the aquous mixture. Thi s may be achieved by covering the mixture by a nylon sheet or a similar protective impervious layer.
Tests carried out on a stored mixture, in accordance with the present i nvention, clearly show that the hydration reaction can be retarded for a substantially long time (the tested mixture was retarded over a year at the time of writing of this specification and still effectively hydration reaction has not commenced).
Once it is desired to use the aquous mixture — and as mentioned hereinabove this may well be many months after the mixture had been prepared - an accelerator, such as KAI(SO4)2 l2(H2O), gypsum (CaSO4 • 2 H2O), K2CO3, INIaHSO4, KHSO4, cement, calcium formate, sodium carbonate, l ithiumcarbonate, calcium nitrate, calcium nitrite, or other accelerators is added and mixed into the aquous mixture, causing the hydration reaction to commence and thus in effect puling out the mixture from its "hibernation" state. The use of accelerators is recommended when the slurry is in a long hibernation state (more than a few days). In most cases, for short term hibernation (up to 2-3 days) accelerators are not necessary.
This last stage is typically performed on site, where the cemeniteous material needs to be used (at a construction site or si milar locale).
The example given hereinabove was aimed at demonstrating retaring hydration reaction in CSH aquous solution, but the method of the present invention is not limited to this material only, and can be used to retard hydration in any aquous solution of cemeniteous material. Quantities and
specific materials of which family groups are mentioed herein may have to be changed accordingly.
The advantage in the present invention is enourmous. It allows a factory regulated quality control rather than relaying on on-site mixing and preparation that is hard to standardize. Furthermore it facilitates a wide range of end-user products, aimed at simplifying construction and building, which means that the preparation stage, that was previously conducted solely on-site is much simpler and faster.
The fact that the present invention allows manufacturing of ready-for-use materials also reduces health hazards, as the end user is less likely to be exposed to fine powder particles.
The present invention also effectively reduces costs, as constructors will not have to bring mixing machines to the construction site (saving water, electricity and machinery). It should be clear that the description of the embodiments set forth in this specification serves only for a better understanding of the invention, without limiting its scope as covered by the following Claims.
It should also be clear that a person skilled in the art, after reading the present specification could make adjustments or amendments to the above described embodiments that would still be covered by the following Claims.
Claims
1. A method for retarding hydration reaction in a cementitous aquous slurry, in which hydration reaction has not commenced yet, the method comprising :
Mixing into the aquous slurry acrylic polymer base material, thereby substantially retarding commencement of hydration reaction in the solution.
2. The method of claim 1, wherein the cementitious aquous slurry comprises calcium sulphate hemihydrate (CSH).
3. The method of claim 2, wherein the acrylic polymer base material is at least 0.1% in weig ht of the CSH.
4. The method of claim 1, wherein a condenser is added to the aquous solution.
5. The method of claim 4, wherein the condenser is selected from the group of condensers containing polysaccharide, starch ether.
6. The method of claim 1, wherein the cementitious aquous slurry comprises cement.
7. The method of claim 1, wherein the acrylic polymer base material is in powder state
8. The method of claim 1, wherein the acrylic polymer base material is in liquid state.
9. The method of claim 8, wherein the acrylic polymer base material is a dispersant.
10. The method of claim 1, wherein the acrylic polymer base material is selected from the group containing : REOTAN L obtainable from Lamberti spa), Ciba Dispex R50/A40/N40 (obtainable from Ciba), Dispex NlOO (Allied Colloids), BEVALOID 66770 (PPMC).
11. The method of claim 1, wherein the acrylic polymer is copolymer.
12. The method of claim 1, wherein the acrylic polymer is homopolymer.
13. The method of claim 1, further comprising adding accelrator into the aquous solution, thereby causing beginning of hydration reaction.
14. The method of claim 13, wherein the accelerator is selected from the group of accelerators containing: KAI(S04)2*12(H2O), gypsum (CaSO4. 2 H2O), K2CO3, NaHSO4, KHSO4 , cement, calcium formate, sodium carbonate, lithiumcarbonate, calcium nitrate, calcium nitrite.
15. A cementitious aquous slurry in which hydration reaction is retarded, comprising acrylic polymer base material mixed homogeneously in the slurry.
16. The slurry of claim 15, wherein the cem entitious aquous slurry comprises calcium sulphate hemihydrate (CSH).
17. The slurry of claim 16, wherein the acrylic polymer base material is at least 0.1% in weight of the CSH.
18. The slurry of claim 15, further comprising a condenser.
19. The slurry of claim 18, wherein the condenser is selected from the group of condensers containing polysaccharide, starch ether.
20. The slurry of claim 15, wherein the cementitious aquous slurry comprises cement.
21. The slurry of claim 15, wherein the acrylic polymer base material is a dispersant.
22. The slurry of claim 15, wherein the acrylic polymer base material is selected from the group containing: REOTAN L obtai nable from Lamberti spa),
Ciba Dispex R50/A40/N40 (obtainable from Ciba), Dispex NlOO (Allied Colloids), BEVALOID 66770 (PPMC).
23. The slury of claim 15, wherein the acrylic polymer is copolymer.
24. The slury of claim 15, wherein the acrylic polymer is homopolymer.
25. The slurry of claim 15, further comprising an accelerator.
26. The slurry of claim 25, wherein the accelerator is selected from the group of accelerators containing : KAI(SO4)2*12(H20), gypsum (CaSO4. 2 H2O), K2Cθ3, NaHSO4, KHSO4 , cement, calcium formate, sodium carbonate, lithiumcarbonate, calcium nitrate, calcium nitrite.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL164748 | 2004-10-21 | ||
| IL16474804A IL164748A0 (en) | 2004-10-21 | 2004-10-21 | Retardation of hydration of cmentitous slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2006043265A2 true WO2006043265A2 (en) | 2006-04-27 |
| WO2006043265A3 WO2006043265A3 (en) | 2006-05-26 |
Family
ID=36203338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IL2005/001071 WO2006043265A2 (en) | 2004-10-21 | 2005-10-10 | Retardation of hydration of cementitous slurry |
Country Status (2)
| Country | Link |
|---|---|
| IL (1) | IL164748A0 (en) |
| WO (1) | WO2006043265A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2070673A3 (en) * | 2007-12-12 | 2010-11-10 | Deutsche Amphibolin-Werke von Robert Murjahn Stiftung & Co KG | Apparatus for mixing building materials |
| IT201700107064A1 (en) * | 2017-09-25 | 2019-03-25 | Mapei Spa | ACCELERATING ADDITIVE FOR HYDRAULIC COMPOSITIONS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1538102A (en) * | 1976-09-15 | 1979-01-10 | Ici Ltd | Calcium sulphate hemihydrate plaster |
| US5341881A (en) * | 1993-01-14 | 1994-08-30 | Halliburton Company | Cement set retarding additives, compositions and methods |
| US5355955A (en) * | 1993-07-02 | 1994-10-18 | Halliburton Company | Cement set retarding additives, compositions and methods |
-
2004
- 2004-10-21 IL IL16474804A patent/IL164748A0/en unknown
-
2005
- 2005-10-10 WO PCT/IL2005/001071 patent/WO2006043265A2/en active Application Filing
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2070673A3 (en) * | 2007-12-12 | 2010-11-10 | Deutsche Amphibolin-Werke von Robert Murjahn Stiftung & Co KG | Apparatus for mixing building materials |
| IT201700107064A1 (en) * | 2017-09-25 | 2019-03-25 | Mapei Spa | ACCELERATING ADDITIVE FOR HYDRAULIC COMPOSITIONS |
| WO2019058313A1 (en) * | 2017-09-25 | 2019-03-28 | Mapei Spa | Accelerating admixture for hydraulic compositions |
| US11365151B2 (en) | 2017-09-25 | 2022-06-21 | Mapei Spa | Accelerating admixture for hydraulic compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006043265A3 (en) | 2006-05-26 |
| IL164748A0 (en) | 2005-12-18 |
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