CN112645624B - Concrete retarder and preparation method thereof - Google Patents
Concrete retarder and preparation method thereof Download PDFInfo
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- CN112645624B CN112645624B CN202110027421.3A CN202110027421A CN112645624B CN 112645624 B CN112645624 B CN 112645624B CN 202110027421 A CN202110027421 A CN 202110027421A CN 112645624 B CN112645624 B CN 112645624B
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- retarding component
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- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
Abstract
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete retarder and a preparation method thereof. The invention provides a concrete retarder in a first aspect, which comprises a first retarding component, a second retarding component and zinc sulfate; wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: (1-4): (0.1-1); the particle size ratio of the first retarding component to the second retarding component is (3-10): 1. the second aspect of the invention provides a preparation method of the concrete retarder, which comprises the following steps: s1: placing the second retarding component in water at normal temperature for treatment for 2-5 minutes; s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete retarder and a preparation method thereof.
Background
The Retarder, Set Retarder, is an additive for reducing the hydration speed and the hydration heat of cement or gypsum and prolonging the setting time. The retarder is added into commercial concrete for prolonging the hydration hardening time of cement, so that the fresh concrete can keep plasticity for a long time, thereby adjusting the setting time of the fresh concrete. Retarders are classified according to structure, and there are several categories: (1) saccharides: calcium saccharate, gluconate, and the like; (2) citric acid, tartaric acid and salts thereof; (3) zinc salts, phosphates; (4) lignosulfonate.
The cement concrete is an indispensable construction material in modern building engineering, and the performance of the cement concrete is influenced and acted by various additives, so that the requirements of construction under different working conditions are met. Before the concrete is poured, a plurality of links such as mixing, stirring, transporting and the like need to be carried out, so that the setting time of the cement is usually required to be prolonged, and the cement can keep a certain plasticity within a long period of time.
Patent publication No. CN111662037A discloses a concrete retarder, which is prepared from the following raw materials: 3-6 parts of modified microcrystalline cellulose, 1-3 parts of acrylic acid, 6-8 parts of modified glass fiber, 5-10 parts of borax, 6-10 parts of polyvinyl chloride resin, 2-4 parts of anhydrous sodium sulfate, 3-5 parts of quartz sand, 8-12 parts of sodium tripolyphosphate and 1-3 parts of carboxymethyl cellulose. The preparation method of the concrete retarder comprises the following steps: (1) adding modified microcrystalline cellulose into polysaccharide aqueous solution with the mass 8 times of that of the modified microcrystalline cellulose, adding a proper amount of potassium chloride, and reacting for 0.5h in a water bath at the temperature of 80 ℃ to obtain modified microcrystalline cellulose sol; (2) dissolving acrylic acid in 10 times of 10% ammonia water solution, adding aluminum hydroxide 0.1% by mass of acrylic acid and potassium disulfate 0.1% by mass of acrylic acid, and reacting in 80 deg.C water bath for 0.5h to obtain acrylic acid sol; (3) mixing the modified microcrystalline cellulose sol and the acrylic sol, and reacting for 1h in a water bath at the temperature of 80 ℃ to prepare composite hydrogel; (4) grinding borax and quartz sand, adding hydrochloric acid solution for immersion treatment for 20-22min, washing, drying, cooling, and mixing with anhydrous sodium sulfate to obtain inorganic mixture; (5) and (3) mixing the composite hydrogel with glass fiber, polyvinyl chloride resin, sodium tripolyphosphate and carboxymethyl cellulose, stirring and mixing at 30 ℃ for 10min, adding an inorganic mixture, and uniformly stirring and mixing to obtain the retarder. But the delayed coagulation effect and the 3d compressive strength of the composite material still limit the use of the composite material under certain special conditions.
In order to solve the technical problems, the applicant develops a concrete retarder and a preparation method thereof.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a concrete retarder comprising a first retarding component, a second retarding component, zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: (1-4): 0.1;
the average particle size ratio of the first retarding component to the second retarding component is (3-10): 1.
in some preferred embodiments, the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 3: 1.
in some preferred embodiments, the first and second retarding components comprise: nanofibers and sodium gluconate; the weight ratio of the nano-fibers to the sodium gluconate is 100: (1-10).
In some preferred embodiments, the weight ratio between the nanofibers and sodium gluconate is 100: 7.
in some preferred embodiments, the first retarding component and the second retarding component are prepared from raw materials comprising: straw fiber, acrylic acid, acrylamide and N- (hydroxymethyl) acrylamide.
In some preferred embodiments, the concrete retarder further comprises a third set retarding component, which is sweet potato flour.
In some preferred embodiments, the weight ratio between the first retarding component and the third retarding component is 100: (1-20).
The second aspect of the invention provides a preparation method of the concrete retarder, which comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2-5 minutes;
s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
The third aspect of the invention provides the application of the concrete retarder in the field of concrete admixtures.
In a fourth aspect, the invention provides concrete, which comprises the concrete retarder.
The invention has the beneficial effects that: compared with the prior art, the concrete in this application can by a relatively large margin promote the time of delaying coagulation, and then reach the effect of delaying coagulation. Because this application is innovative to cooperate multiple delayed coagulation component to use, can also promote 3 d's compressive strength simultaneously, equally when the temperature is lower, still can keep higher compressive strength.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the embodiments described are only some representative embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The invention provides a concrete retarder in a first aspect, which comprises a first retarding component, a second retarding component and zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: (1-4): (0.1-1);
the average particle size ratio of the first retarding component to the second retarding component is (3-10): 1.
in some preferred embodiments, the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 3: 1.
the terms "first retarding component" and "second retarding component" mean that the components are the same, but the particle sizes are different, the size of the first retarding component is large, and the size of the second retarding component is small, on one hand, the first retarding component and the second retarding component are stacked in space, the space is compacted, and the retarding effect is improved; on the other hand, the addition of zinc sulfate can cause zinc hydroxide and calcium sulfate to appear in the system, and the precipitated substances can form a protective film on the surface of cement particles, thereby further playing a retarding effect.
In some preferred specific embodiments, the first and second retarding components comprise: nanofibers and sodium gluconate; the weight ratio of the nano-fibers to the sodium gluconate is 100: (1-10).
In some preferred specific embodiments, the weight ratio between the nanofibers and sodium gluconate is 100: 7.
in some preferred embodiments, the raw material for preparing the nanofiber comprises: straw fiber, acrylic acid, acrylamide and N- (hydroxymethyl) acrylamide.
The first retarding component is prepared as follows:
adding corn straws into 55% acetic acid solution, soaking for 3 hours at 60 ℃, drying and crushing to obtain straw fibers; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring sodium hydroxide and water according to the mass ratio of 1:10, and adding acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then evenly mixing the weighed acrylamide, N- (hydroxymethyl) acrylamide and water according to a certain proportion to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, heating to 80 ℃ within 5 hours, and adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, adding sodium gluconate, uniformly stirring, keeping the temperature for 3 hours, drying and granulating to obtain a first retarding component.
The application creatively uses sodium gluconate and nanofiber in cooperation, and the nanofiber can provide the slowly-releasing space for sodium gluconate, and after each raw materials of concrete mixes, the swelling of certain degree can be carried out to first delayed coagulation component and second delayed coagulation component, and then sodium gluconate can get into the concrete system gradually, plays the delayed coagulation effect.
In some preferred embodiments, the concrete retarder further comprises a third set retarding component, which is sweet potato flour.
In some preferred embodiments, the weight ratio between the first retarding component and the third retarding component is 100: (1-20).
The second aspect of the invention provides a preparation method of the concrete retarder, which comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2-5 minutes;
s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
The applicant finds that the second retarding component can be swelled to a certain extent by processing the second retarding component, a swelling body is formed by controlling the swelling time, the swelling body has certain elasticity, the swelling body is more beneficial to the action between the swelling body and each component, and the second retarding component after swelling processing can effectively prolong the retarding time and improve the compressive strength.
The third aspect of the invention provides the application of the concrete retarder in the field of concrete admixtures.
In a fourth aspect, the invention provides concrete, which comprises the concrete retarder.
The following are specific examples to illustrate the technical solutions of the present application.
First embodiment
A first embodiment of the present application provides a concrete retarder comprising a first retarding component, a second retarding component, zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 1: 0.1;
the first retarding component and the second retarding component are prepared as follows:
adding 1kg of corn straw into 55% acetic acid solution, soaking for 3 hours at 60 ℃, drying and crushing to obtain straw fiber; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring 100g of sodium hydroxide and water according to the mass ratio of 1:10, and adding 50g of acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then, uniformly mixing 80g of acrylamide, 5g N- (hydroxymethyl) acrylamide and water according to the mass ratio of 1:10 to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, slowly heating to 80 ℃ within 5 hours, and then adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, and then adding sodium gluconate, wherein the mass ratio of the nano fibers to the sodium gluconate is 100: 1, after uniformly stirring, preserving heat for 3 hours, drying, and respectively granulating according to different average particle sizes to obtain a first retarding component and a first retarding component, wherein the average particle size of the first retarding component is 9 mm; the average particle size of the second component was 3 mm.
The preparation method of the concrete retarder comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2 minutes;
s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
Second embodiment
A second embodiment of the present application provides a concrete retarder comprising a first retarding component, a second retarding component, zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 4: 0.1;
the first retarding component and the second retarding component are prepared as follows:
adding 1kg of corn straw into 55% acetic acid solution, soaking for 3 hours at 60 ℃, drying and crushing to obtain straw fiber; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring 100g of sodium hydroxide and water according to the mass ratio of 1:10, and adding 50g of acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then, uniformly mixing 80g of acrylamide, 5g N- (hydroxymethyl) acrylamide and water according to the mass ratio of 1:10 to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, slowly heating to 80 ℃ within 5 hours, and then adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, and then adding sodium gluconate, wherein the mass ratio of the nano fibers to the sodium gluconate is 10: 1, after uniformly stirring, preserving heat for 3 hours, drying, and respectively granulating according to different average particle sizes to obtain a first retarding component and a first retarding component, wherein the average particle size of the first retarding component is 10 mm; the average particle size of the second component was 1 mm.
The preparation method of the concrete retarder comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2 minutes;
s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
Third embodiment
A third embodiment of the present application provides a concrete retarder comprising a first set retarding component, a second set retarding component, zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 3: 1;
the first retarding component and the second retarding component are prepared as follows:
adding 1kg of corn straw into 55% acetic acid solution, soaking for 3 hours at 60 ℃, drying and crushing to obtain straw fiber; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring 100g of sodium hydroxide and water according to the mass ratio of 1:10, and adding 50g of acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then, uniformly mixing 80g of acrylamide, 5g N- (hydroxymethyl) acrylamide and water according to the mass ratio of 1:10 to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, slowly heating to 80 ℃ within 5 hours, and then adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, and then adding sodium gluconate, wherein the mass ratio of the nano fibers to the sodium gluconate is 100: 7, after uniformly stirring, keeping the temperature for 3 hours, drying, and respectively granulating according to different average particle sizes to obtain a first retarding component and a first retarding component, wherein the average particle size of the first retarding component is 7 mm; the average particle size of the second component was 1 mm.
The preparation method of the concrete retarder comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2 minutes;
s2: and uniformly mixing the treated first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
Fourth embodiment
A fourth embodiment of the present application provides a concrete retarder comprising a first set retarding component, a second set retarding component, zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the third retarding component to the zinc sulfate is 10: 3: 2: 1;
the first retarding component and the second retarding component are prepared as follows:
adding 1kg of corn straw into 55% acetic acid solution, soaking for 3 hours at 60 ℃, drying and crushing to obtain straw fiber; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring 100g of sodium hydroxide and water according to the mass ratio of 1:10, and adding 50g of acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then, uniformly mixing 80g of acrylamide, 5g N- (hydroxymethyl) acrylamide and water according to the mass ratio of 1:10 to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, slowly heating to 80 ℃ within 5 hours, and then adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, and then adding sodium gluconate, wherein the mass ratio of the nano fibers to the sodium gluconate is 100: 7, after uniformly stirring, keeping the temperature for 3 hours, drying, and respectively granulating according to different average particle sizes to obtain a first retarding component and a first retarding component, wherein the average particle size of the first retarding component is 7 mm; the average particle size of the second component was 1 mm.
The preparation method of the concrete retarder comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2 minutes;
s2: and uniformly mixing the treated first retarding component, the second retarding component, the third retarding component and zinc sulfate in proportion to obtain the concrete retarder.
First comparative example:
the first comparative example is different from the fourth example in that the first retarding component and the second retarding component are set to the same size and are each set to 10 mm.
Second comparative example:
the second comparative example is different from the fourth example in that the first retarding component and the second retarding component are set to the same size, both being set to 1 mm.
Third comparative example:
the third comparative example is different from the fourth example in the point that the first retarding component and the second retarding component are not included in the raw materials.
Fourth comparative example:
the fourth comparative example is different from the fourth example in that the first retarding component and the second retarding component are not fed with N- (hydroxymethyl) acrylamide.
Fifth comparative example:
the fifth comparative example is different from the fourth example in that the first retarding component and the second retarding component do not contain sodium gluconate.
Sixth comparative example:
the sixth comparative example is the same as the fourth example in specific steps, but is different from the fourth example in that the weight ratio of the nanofibers to the sodium gluconate is 1: 1.
seventh comparative example:
the specific procedure of the seventh comparative example is different from that of the fourth example in that the second retarding component is not disposed in water.
Eighth comparative example:
the eighth comparative example is different from the fourth example in the specific procedure in that the first retarding component is left in water for 2 minutes.
Ninth comparative example:
the ninth comparative example is different from the fourth example in the specific procedure in that the second retarding component is left in water for 9 minutes.
Tenth comparative example:
the detailed procedure of the tenth comparative example is the same as the fourth example, except that the second retarding component was left in the starch paste for treatment for 2 minutes.
The performance test method comprises the following steps:
the concrete comprises the following raw materials:
and sequentially adding the raw materials into a stirrer, and uniformly stirring to obtain the concrete. Respectively manufacturing concrete into concrete test blocks with the sizes of 150mm multiplied by 150mm, and preparing 3 test blocks for each group of concrete; the prepared test blocks are divided into two groups, one group is placed in an environment with the temperature of 20 ℃ and the relative humidity of 95% for curing for 3 days, the other group is placed in an environment with the temperature of-10 ℃ and the relative humidity of 95% for curing for 3 days, and after curing, the compressive strength of the concrete test block is tested by the GB/T50080-2002 common concrete mechanical property test method, and the specific data are shown in a product performance evaluation table in Table 1.
Table 1 evaluation table of product properties
Through the above embodiment and the comparative example, it can be seen that the technical scheme in the application can improve the retardation time and has the retardation effect. And the technical scheme of the application can effectively improve the 3d compressive strength, and the applicant finds that the scheme of the application can also improve the 3d compressive strength at a low temperature, so that the application region of the concrete is enlarged, and the application performance of the concrete can still be kept in a cold region.
In addition, the technical scheme of this application all has better corrosion-resistant effect.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (6)
1. The concrete retarder is characterized by comprising a first retarding component, a second retarding component and zinc sulfate;
wherein the weight ratio of the first retarding component to the second retarding component to the zinc sulfate is 10: 3: 1;
the preparation raw materials of the first retarding component and the second retarding component comprise: nanofibers and sodium gluconate; the first retarding component and the second retarding component have the same components but different particle sizes;
the weight ratio of the nano-fibers to the sodium gluconate is 100: 7;
the average particle size ratio of the first retarding component to the second retarding component is (3-10): 1, the raw materials for preparing the nano-fiber comprise: straw fiber, acrylic acid, acrylamide, N- (hydroxymethyl) acrylamide; the first retarding component is prepared as follows:
adding 55% acetic acid solution into corn straw, soaking at 60 deg.C for 3 hr, drying, and pulverizing to obtain straw fiber; then mixing the obtained straw fibers with water according to the mass ratio of 1:200, and placing the mixture in an ultrasonic machine for ultrasonic dispersion for 30min to obtain a first raw material;
uniformly stirring sodium hydroxide and water according to the mass ratio of 1:10, and adding acrylic acid into the uniformly stirred sodium hydroxide solution to obtain a sodium acrylate solution and obtain a second raw material;
then evenly mixing the weighed acrylamide, N- (hydroxymethyl) acrylamide and water according to a certain proportion to obtain a third raw material;
uniformly mixing the first raw material, the second raw material and the third raw material to obtain a mixed solution;
placing the mixed solution in a reaction kettle, heating to 80 ℃ within 5 hours, and adding sodium persulfate, wherein the mass ratio of the sodium persulfate to the mixed solution is 1: and 1000, starting stirring, stopping stirring when the viscosity of the mixed solution is increased to obtain nano fibers, adding sodium gluconate, uniformly stirring, keeping the temperature for 3 hours, drying and granulating to obtain a first retarding component.
2. The concrete retarder of claim 1, further comprising a third set retarding component, wherein the third set retarding component is sweet potato flour.
3. The concrete retarder of claim 2, wherein the weight ratio between the first retarding component and the third retarding component is 100: (1-20).
4. The method for preparing the concrete retarder according to claim 1, which comprises the following steps:
s1: placing the second retarding component in water at normal temperature for treatment for 2-5 minutes;
s2: and uniformly mixing the first retarding component, the treated second retarding component and zinc sulfate in proportion to obtain the concrete retarder.
5. Use of the concrete retarder according to any one of claims 1 to 3 in the field of concrete admixtures.
6. A concrete comprising the concrete retarder of any one of claims 1-3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8317916B1 (en) * | 2009-09-09 | 2012-11-27 | Pebble Technology, Inc. | Set retardant for hydraulic cement compositions |
| CN108623229A (en) * | 2018-07-02 | 2018-10-09 | 深圳市东大洋建材有限公司 | A kind of ultra-retardation concrete and preparation method thereof |
| CN109678389B (en) * | 2019-02-25 | 2019-10-11 | 内蒙古高等级公路建设开发有限责任公司 | Cement concrete efficient retardation water reducing agent and preparation method thereof |
| CN111662037B (en) * | 2020-06-12 | 2022-01-21 | 贵州凯襄新材料有限公司 | Concrete retarder and preparation method thereof |
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