CN111548049A - Composite retarding and water reducing agent and preparation method thereof - Google Patents
Composite retarding and water reducing agent and preparation method thereof Download PDFInfo
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- CN111548049A CN111548049A CN202010549906.4A CN202010549906A CN111548049A CN 111548049 A CN111548049 A CN 111548049A CN 202010549906 A CN202010549906 A CN 202010549906A CN 111548049 A CN111548049 A CN 111548049A
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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
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Abstract
The invention belongs to the field of concrete admixtures, and particularly relates to a composite retarding and water reducing agent and a preparation method thereof. The composite retarding and water reducing agent comprises the following components: sodium lignosulfonate, fly ash, calcium silicate, sodium gluconate, silica gel powder, carboxymethyl cellulose, sulfonated humic acid, modified polycarboxylate and citric acid; the preparation method is simple, has good retarding and water reducing effects, is simple and is beneficial to popularization and application.
Description
Technical Field
The invention belongs to the field of concrete admixtures, and particularly relates to a composite retarding and water reducing agent and a preparation method thereof.
Background
Concrete admixture, referred to as admixture for short, is a substance added to improve the performance of concrete before or during the mixing process of mixing the concrete. The admixture can effectively improve the performance of concrete and has good economic benefit, so the admixture is more and more emphasized in engineering and becomes an indispensable material in the concrete.
High-rise building pumping concrete and long-distance transportation concrete need to have a large flow state retarder in order to keep good working performance; when large-volume concrete is constructed in summer, in order to prevent excessive concentration of hydration heat and avoid temperature stress cracks generated by the concrete, the hydration heat of the concrete is required to be low, the heat release is slow, the concrete has slow setting retardation, in different projects, the concrete is required to have early strength or strength in various ages and the like according to different requirements, and the improvement of the technical performance of all the concrete is realized through a water reducing agent.
The slow setting water reducer is one of concrete admixtures, can delay concrete setting time, makes newly-mixed concrete keep plasticity for a long time, conveniently pours, improves the efficiency of construction, can not cause harmful effects to each item performance in concrete later stage simultaneously, and has the water reducing effect concurrently. The retarding water reducer used in the current market has the defects of unobvious retarding effect and low water reducing rate, and can not meet the requirements of high-strength and high-performance concrete.
Chinese patent application CN104119027A discloses a retarding water reducing agent, which is prepared by mixing the following raw materials in parts by weight: 35-45 parts of beta-naphthalenesulfonate formaldehyde condensate, 20-30 parts of sulfonated acetone-formaldehyde condensate, 10-15 parts of hydroxypropyl methyl cellulose, 6-12 parts of casein, 3-6 parts of mirabilite, 4-8 parts of sulfonated coal tar, 2-4 parts of borax, 5-10 parts of slaked lime, 8-14 parts of activated sludge, 5-10 parts of sodium fluosilicate, 2.5-4.5 parts of oil residue, 2-3 parts of tartaric acid, 3-5 parts of zinc molybdate, 4-6 parts of triethyl phosphate, 2-4 parts of maltodextrin, 4-8 parts of sodium methallyl sulfonate and 3-6 parts of auxiliary agent. The water reducing agent has good retardation effect, can prolong the setting time by 2-4 hours, has the water reducing rate of 15-20 percent, can greatly improve the workability of concrete, improves and enhances various mechanical properties of the concrete, has good adaptability to various cements, has no corrosion effect on reinforcing steel bars, and can be used for various reinforced concrete projects. However, the water reducer has various raw materials, is not beneficial to the stabilization of the water reducer, and is not beneficial to saving the batching time and reducing the cost on the other hand.
The Chinese patent application CN107337376A discloses a polycarboxylate super-retarding water reducing agent, which comprises the following components in percentage by mass: 10-30% of polycarboxylic acid water reducing agent, 0-1% of water-retaining agent, 0-0.1% of defoaming agent, 0-0.1% of air-entraining agent, 2-15% of retarder, 0.3-3% of polydimethylsiloxane/montmorillonite nano composite material and the balance of water. But the comprehensive performances such as retardation, water reduction and the like are still to be improved.
Disclosure of Invention
In order to overcome the technical problems, the invention provides the composite retarding and water reducing agent which has good retarding and water reducing effects, is simple in preparation method and is beneficial to popularization and application.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a composite retarding and water reducing agent comprises the following components:
sodium lignosulfonate, fly ash, calcium silicate, sodium gluconate, silica gel powder, carboxymethyl cellulose, sulfonated humic acid, modified polycarboxylate and citric acid.
Preferably, the composite retarding and water reducing agent comprises the following components in parts by weight:
50-200 parts of sodium lignosulphonate, 10-50 parts of fly ash, 10-50 parts of calcium silicate, 1-10 parts of sodium gluconate, 1-20 parts of silica gel powder, 5-20 parts of carboxymethyl cellulose, 1-15 parts of sulfonated humic acid, 10-100 parts of modified polycarboxylate and 1-10 parts of citric acid;
preferably, the composite retarding and water reducing agent comprises the following components in parts by weight:
200 parts of sodium lignosulfonate, 10-20 parts of fly ash, 10-20 parts of calcium silicate, 5-10 parts of sodium gluconate, 5-10 parts of silica gel powder, 10-15 parts of carboxymethyl cellulose, 5-10 parts of sulfonated humic acid, 50-80 parts of modified polycarboxylate and 3-8 parts of citric acid;
preferably, the carboxymethyl cellulose has a molecular weight of 6000-7000.
Preferably, the sulfonated humic acid is obtained by sulfonating humic acid.
Preferably, the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the HA is dissolved, adding sulfonating agent, reacting, adjusting pH value after the reaction is finished, filtering, drying, and pulverizing to obtain sulfonated humic acid.
Preferably, the sulfonating agent is NaHSO3Or Na2SO3；
Preferably, the adding amount of the sulfonating agent is 2-5 times of the mass of humic acid;
preferably, the reaction is carried out at 40-60 ℃;
preferably, the pH value is 3-5.
Preferably, the modified polycarboxylate is prepared by polymerizing 2-acrylamido-2-methylpropanesulfonic acid and maleic anhydride with an initiator.
Preferably, the preparation method of the modified polycarboxylate comprises the following steps:
adding 2-acrylamide-2-methylpropanesulfonic acid into water, adding maleic anhydride, adding an initiator, carrying out polymerization reaction to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to obtain the modified polycarboxylate.
Preferably, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the maleic anhydride is 1:3 to 5;
preferably, the amount of the added water is 15 to 30 times of the mass of the 2-acrylamido-2-methylpropanesulfonic acid;
preferably, the pH value is 8-10.
Preferably, the initiator is azobisisobutyrimidazoline hydrochloride; the dosage of the initiator is 0.05-0.08 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid and the maleic anhydride.
Preferably, the temperature of the polymerization reaction is 50-60 ℃; the reaction time is 2-4 h.
The invention also aims to provide a preparation method of the composite retarding and water reducing agent, which comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in water, adding the modified polycarboxylate, and heating to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Preferably, in the step (1), the water amount is 5-6 times of the total mass of the sodium lignosulphonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid;
preferably, in step (1), the temperature of the heating is 40-60 ℃.
Compared with the prior art, the invention has the technical advantages that:
(1) the composite retarding and water reducing agent prepared by the invention has good retarding and water reducing effects.
(2) In the composite retarding water reducer prepared by the invention, the carboxymethyl cellulose and the sulfonated humic acid have good synergistic effect, and the carboxymethyl cellulose and the sulfonated humic acid have certain water retention effect, so that the slurry can not crack due to too fast drying after being coated, the strength after hardening is enhanced, and a good retarding effect is achieved.
(3) The modified polycarboxylate has good dispersibility, can stably disperse the fly ash, the calcium silicate and the silica gel powder in a composite retarding and water reducing agent mixing system, can effectively act together with other components, and improves the water reducing rate of the water reducing agent.
Detailed Description
The present invention will be described below with reference to specific examples to make the technical aspects of the present invention easier to understand and grasp, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of sulfonated humic acid, 80 parts of modified polycarboxylate and 3 parts of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), and addingDissolving potassium hydroxide, adding NaHSO 2 times of humic acid3Sulfonating agent reacts at 40 ℃, pH value is adjusted to 3 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 15 times of water, adding 3 parts of maleic anhydride, adding 0.05% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in 5 times (calculated by the total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Example 2
The composite retarding and water reducing agent comprises the following components in parts by weight:
200 parts of sodium lignosulphonate, 10 parts of fly ash, 20 parts of calcium silicate, 5 parts of sodium gluconate, 10 parts of silica gel powder, 15 parts of carboxymethyl cellulose (molecular weight 6000), 5 parts of sulfonated humic acid, 50 parts of modified polycarboxylate and 8 parts of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the HA is dissolved, and adding Na which is 5 times of the mass of the HA2SO3Sulfonating agent reacts at 60 ℃, pH value is adjusted to 5 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 30 times of water, adding 5 parts of maleic anhydride, adding 0.08% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 4 hours at 60 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 10, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in 6 times (calculated by the total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 60 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Example 3
The composite retarding and water reducing agent comprises the following components in parts by weight:
50 parts of sodium lignosulfonate, 50 parts of fly ash, 50 parts of calcium silicate, 10 parts of sodium gluconate, 20 parts of silica gel powder, 20 parts of carboxymethyl cellulose (with the molecular weight of 7000), 1 part of sulfonated humic acid, 10 parts of modified polycarboxylate and 1 part of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the solution is dissolved, and adding NaHSO 3 times of the humic acid3Sulfonating agent reacts at 50 ℃, pH value is adjusted to 4 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 20 times of water, adding 4 parts of maleic anhydride, adding 0.07 percent (calculated by the total mass of the 2-acrylamide-2-methylpropanesulfonic acid and the maleic anhydride) of azodiisobutyl imidazoline hydrochloride initiator, carrying out polymerization reaction for 3 hours at 55 ℃ to obtain a copolymer of the 2-acrylamide-2-methylpropanesulfonic acid and the maleic anhydride, and adding ammonia water to adjust the pH value to 9, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in 5-6 times (by total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 60 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Example 4
The composite retarding and water reducing agent comprises the following components in parts by weight:
200 parts of sodium lignosulphonate, 10 parts of fly ash, 10 parts of calcium silicate, 1 part of sodium gluconate, 1 part of silica gel powder, 5 parts of carboxymethyl cellulose (molecular weight 6000), 15 parts of sulfonated humic acid, 100 parts of modified polycarboxylate and 10 parts of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the HA is dissolved, and adding Na 4 times of the humic acid2SO3Sulfonating agent reacts at 50 ℃, pH value is adjusted to 4 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 20 times of water, adding 4 parts of maleic anhydride, adding 0.06% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 60 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in 5-6 times (by total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Comparative example 1
Compared with example 1, the difference is only in the composition.
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of humic acid, 80 parts of modified polycarboxylate and 3 parts of citric acid;
the preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 15 times of water, adding 3 parts of maleic anhydride, adding 0.05% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, humic acid and citric acid in 5 times (calculated by the total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Comparative example 2
Compared with example 1, the difference is only in the composition.
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of sulfonated humic acid, 80 parts of modified polycarboxylate and 3 parts of lactic acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the solution is dissolved, and adding NaHSO 2 times of the humic acid3Sulfonating agent reacts at 40 ℃, pH value is adjusted to 3 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 15 times of water, adding 3 parts of maleic anhydride, adding 0.05% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and lactic acid in 5 times (calculated by the total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the lactic acid) of water, adding the modified polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Comparative example 3
Compared with example 1, the difference is only in the composition.
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of sulfonated humic acid, 80 parts of polycarboxylate and 3 parts of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the solution is dissolved, and adding NaHSO 2 times of the humic acid3Sulfonating agent reacts at 40 ℃, pH value is adjusted to 3 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the polycarboxylate comprises the following steps:
adding maleic anhydride into 15 times of water, adding 0.05 percent (calculated by the total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azodiisobutyl imidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in 5 times (by total mass of the sodium lignosulfonate, the sodium gluconate, the carboxymethyl cellulose, the sulfonated humic acid and the citric acid) of water, adding polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Comparative example 4
The only difference compared to example 1 is the method of preparation of the modified polycarboxylate.
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 10 parts of carboxymethyl cellulose (molecular weight 6400), 10 parts of sulfonated humic acid, 80 parts of modified polycarboxylate and 3 parts of citric acid;
the preparation method of the sulfonated humic acid is the same as that of example 1.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 15 times of water, adding 3 parts of maleic anhydride, adding 0.05% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of ammonium persulfate initiator, carrying out polymerization reaction for 2h at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent has the same steps as the example 1.
Comparative example 5
The difference compared with example 1 is only that sulfonated humic acid is used instead of carboxymethyl cellulose.
The composite retarding and water reducing agent comprises the following components in parts by weight:
100 parts of sodium lignosulphonate, 20 parts of fly ash, 10 parts of calcium silicate, 10 parts of sodium gluconate, 5 parts of silica gel powder, 20 parts of sulfonated humic acid, 80 parts of modified polycarboxylate and 3 parts of citric acid;
the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into Humic Acid (HA), adding potassium hydroxide until the solution is dissolved, and adding NaHSO 2 times of the humic acid3Sulfonating agent reacts at 40 ℃, pH value is adjusted to 3 after the reaction is finished, and sulfonated humic acid is obtained after suction filtration, drying and crushing.
The preparation method of the modified polycarboxylate comprises the following steps:
adding 1 part of 2-acrylamide-2-methylpropanesulfonic acid into 15 times of water, adding 3 parts of maleic anhydride, adding 0.05% (by total mass of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride) of azobisisobutyrimidazoline hydrochloride initiator, carrying out polymerization reaction for 2 hours at 50 ℃ to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to 8, thus obtaining the modified polycarboxylate.
The preparation method of the composite retarding and water reducing agent comprises the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, sulfonated humic acid and citric acid in 5 times (by total mass of the sodium lignosulfonate, the sodium gluconate, the sulfonated humic acid and the citric acid) of water, adding the modified polycarboxylate, and heating at 40 ℃ to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
Examples of effects
According to the method recorded in GB8076-2008 concrete admixture, the performance of the retarding and water reducing agents prepared in examples 1-4 and comparative examples 1-5 after being used in concrete is detected, and the results are shown in Table 1.
TABLE 1 Performance parameters of retarding water reducers
Therefore, the retarding and water reducing agent provided by the invention has good effects of retarding and reducing water rate, and the composition and the preparation method thereof have great influence on the performance.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (10)
1. The composite retarding and water reducing agent is characterized by comprising the following components:
sodium lignosulfonate, fly ash, calcium silicate, sodium gluconate, silica gel powder, carboxymethyl cellulose, sulfonated humic acid, modified polycarboxylate and citric acid.
2. The composite retarding and water reducing agent of claim 1, which comprises the following components in parts by weight:
50-200 parts of sodium lignosulphonate, 10-50 parts of fly ash, 10-50 parts of calcium silicate, 1-10 parts of sodium gluconate, 1-20 parts of silica gel powder, 5-20 parts of carboxymethyl cellulose, 1-15 parts of sulfonated humic acid, 10-100 parts of modified polycarboxylate and 1-10 parts of citric acid.
3. The composite retarding and water reducing agent of any one of claims 1-2, wherein the sulfonated humic acid is obtained by sulfonating humic acid; the preparation method of the sulfonated humic acid comprises the following steps:
adding distilled water into humic acid, adding potassium hydroxide until the humic acid is dissolved, adding a sulfonating agent, reacting, adjusting the pH value after the reaction is finished, performing suction filtration, drying and crushing to obtain the sulfonated humic acid.
4. The composite set retarding and water reducing agent of claim 3, wherein the sulfonating agent is NaHSO3Or Na2SO3。
5. The composite retarding and water reducing agent of claim 4, wherein the addition amount of the sulfonating agent is 2-5 times of the mass of the humic acid.
6. The composite set retarding water reducer of claim 3, wherein the reaction is carried out at 40-60 ℃; the pH value is 3-5.
7. The composite retarding and water reducing agent of claim 1, wherein the modified polycarboxylate is prepared by polymerizing 2-acrylamido-2-methylpropanesulfonic acid and maleic anhydride with an initiator;
the preparation method of the modified polycarboxylate comprises the following steps:
adding 2-acrylamide-2-methylpropanesulfonic acid into water, adding maleic anhydride, adding an initiator, carrying out polymerization reaction to obtain a copolymer of 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride, and adding ammonia water to adjust the pH value to obtain the modified polycarboxylate.
8. The composite set retarding water reducer of claim 7, wherein the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the maleic anhydride is 1:3 to 5; the amount of the added water is 15-30 times of the mass of the 2-acrylamide-2-methylpropanesulfonic acid; the pH value is 8-10.
9. The composite set retarding water reducer of claim 7, wherein the initiator is azobisisobutyrimidazoline hydrochloride; the dosage of the initiator is 0.05-0.08 percent of the total mass of the 2-acrylamide-2-methylpropanesulfonic acid and the maleic anhydride.
10. The preparation method of the composite set-retarding water reducer as claimed in any one of claims 1 to 9, comprising the following steps:
(1) sequentially dissolving sodium lignosulfonate, sodium gluconate, carboxymethyl cellulose, sulfonated humic acid and citric acid in water, adding the modified polycarboxylate, and heating to obtain a mixed solution;
(2) and dispersing fly ash, calcium silicate and silica gel powder into the mixed solution, and uniformly dispersing to obtain the composite retarding and water reducing agent mixed dispersion liquid.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112125561A (en) * | 2020-09-18 | 2020-12-25 | 河海大学 | Cement-based material heat regulation retarder based on plant pollen extracting solution, preparation method and application |
| CN112661435A (en) * | 2020-12-24 | 2021-04-16 | 江西富创新材料有限公司 | High-efficiency concrete composite additive |
| CN114735963A (en) * | 2022-03-17 | 2022-07-12 | 山东科润赢新材料科技有限公司 | Polycarboxylic acid super-retarding water reducer with small slump and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280628A (en) * | 2008-05-23 | 2008-10-08 | 中建五局第三建设有限公司 | Special fine sand high-strength high-performance concrete ultra-high pumping construction method |
| CN105967621A (en) * | 2016-05-09 | 2016-09-28 | 天津城建大学 | Thermal insulation waterproof flame-retardant integral plate and preparation method thereof |
-
2020
- 2020-06-16 CN CN202010549906.4A patent/CN111548049B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101280628A (en) * | 2008-05-23 | 2008-10-08 | 中建五局第三建设有限公司 | Special fine sand high-strength high-performance concrete ultra-high pumping construction method |
| CN105967621A (en) * | 2016-05-09 | 2016-09-28 | 天津城建大学 | Thermal insulation waterproof flame-retardant integral plate and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112125561A (en) * | 2020-09-18 | 2020-12-25 | 河海大学 | Cement-based material heat regulation retarder based on plant pollen extracting solution, preparation method and application |
| CN112661435A (en) * | 2020-12-24 | 2021-04-16 | 江西富创新材料有限公司 | High-efficiency concrete composite additive |
| CN114735963A (en) * | 2022-03-17 | 2022-07-12 | 山东科润赢新材料科技有限公司 | Polycarboxylic acid super-retarding water reducer with small slump and production method thereof |
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