CN114133163B - Concrete admixture and preparation method thereof - Google Patents
Concrete admixture and preparation method thereof Download PDFInfo
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- CN114133163B CN114133163B CN202111401474.3A CN202111401474A CN114133163B CN 114133163 B CN114133163 B CN 114133163B CN 202111401474 A CN202111401474 A CN 202111401474A CN 114133163 B CN114133163 B CN 114133163B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to the technical field of concrete, in particular to a concrete admixture and a preparation method thereof. The admixture comprises the following raw materials in parts by weight: 30-40 parts of water reducer mother liquor, 2-6 parts of sodium alginate, 3-7 parts of lignosulfonate, 2-5 parts of potassium acrylate, 4-8 parts of polyethylene glycol, 5-9 parts of sodium silicate, 20-30 parts of first deionized water and 1-3 parts of other auxiliaries, wherein the other auxiliaries comprise a defoaming agent and an air entraining agent. The water reducer can obviously reduce the bleeding rate of concrete through other synergistic effects of all components, further improves the workability, strength and durability of the concrete, and has good freezing resistance, cold resistance, water resistance and other properties.
Description
Technical Field
The application relates to the technical field of concrete, in particular to a concrete admixture and a preparation method thereof.
Background
Concrete is one of the most indispensable building materials in the current building field, and buildings such as houses, bridges, roads, dams, tunnels and the like all need concrete everywhere in our lives, so that the requirement on the concrete is higher and higher, the concrete is only limited to one function such as freezing resistance, cold resistance, abrasion resistance, corrosion resistance or high strength, and the concrete is required to have better comprehensive performance so as to be suitable for various scenes.
Generally, additives are selected and added for improving and adjusting the performance of concrete, and at present, concrete additives are various in variety and have different functions. The additive of different varieties can achieve different effects, such as improving the corrosion resistance of concrete, improving the brittleness of concrete, improving the freeze-thaw resistance of hardened concrete, greatly reducing the water consumption of concrete, improving the strength of concrete, compensating the shrinkage of concrete, reducing the shrinkage crack of concrete, prolonging the service life of concrete, improving the durability and the like. In order to improve the water reducing effect of concrete, an additive is usually added into the concrete, but although the water reducing effect can be achieved by adding the additive, the problem of increased bleeding rate is caused, the quality of the concrete is affected, and once the bleeding rate is increased, the following situations can occur: firstly, the water-cement ratio of the concrete surface is increased, and floating slurry appears, namely, a large amount of cement particles are carried in floating water, a slurry return layer is formed on the concrete surface, the strength is very low after hardening, and meanwhile, the wear resistance of the concrete is reduced; secondly, water pockets are easily formed around the concrete coarse aggregate and the reinforcing steel bars, and gaps are formed along with gradual volatilization of water, so that the compactness of the concrete, the interface strength of the aggregate and the bond stress between the concrete and the reinforcing steel bars are influenced, and the overall strength of the concrete is reduced; and thirdly, the corrosion resistance and the frost resistance of the concrete are damaged under the bleeding condition, and as the internal bleeding channels after bleeding are communicated, corrosive substances reach the interior of the concrete through the bleeding channels, steel bars are corroded from the corrosive substances to the surfaces of the steel bars, and hydration products cause corrosion reaction to damage the quality of the concrete.
Disclosure of Invention
In order to improve the technical problems, the application provides a concrete admixture and a preparation method thereof.
In a first aspect, the present application provides a concrete admixture, which adopts the following technical scheme:
the concrete admixture comprises the following raw materials in parts by weight:
30-40 parts of water reducer mother liquor
2-6 parts of sodium alginate
3-7 parts of lignosulfonate
2-5 parts of potassium acrylate
4-8 parts of polyethylene glycol
5-9 parts of sodium silicate
20-30 parts of first deionized water
1-3 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent.
By adopting the technical scheme, the water reducing agent mother liquor enables concrete to have excellent durability and frost resistance, the first deionized water and the polyethylene glycol are used as solvents to dissolve sodium alginate, lignosulfonate, potassium acrylate and the water reducing agent mother liquor, and the solution formed by uniformly stirring can improve the mixing uniformity of all components in the concrete, the polyethylene glycol is soluble in water and has good lubricity, moisture retention and dispersibility, thereby being beneficial to mixing concrete particles, the uniformly mixed concrete has good physical properties, the lignosulfonate has strong adaptability and workability to cement, the possibility of slump can be effectively reduced, the sodium alginate, the potassium acrylate and the sodium silicate can enhance the adhesion degree among the concrete components, the sodium silicate has high strength, strong acid resistance and good heat resistance, the concrete has better strength, and the corrosion resistance and the heat resistance of the concrete are enhanced, when the sodium alginate is used for enabling the admixture to act on concrete, the retardation of the concrete is better improved, the foaming agent and the defoaming agent can reduce the generation of micro bubbles in the concrete and improve the bonding fastness of the concrete, the raw materials are mutually cooperated and matched for use, so that the admixture has higher effective water reducing performance on the cement in the concrete, the fluidity of concrete components can be improved, the bleeding performance of the concrete is reduced, the performances of corrosion resistance, workability and the like of the concrete are further improved, and the cracking condition of the concrete is reduced.
Preferably, the feed comprises the following raw materials in parts by weight:
34-38 parts of mother liquor of water reducing agent
3-5 parts of sodium alginate
4-6 parts of lignosulfonate
3-4 parts of potassium acrylate
5-6 parts of polyethylene glycol
7-9 parts of sodium silicate
22-26 parts of first deionized water
2-3 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent.
By adopting the technical scheme, the proportion of each component in the admixture is optimized, the dispersity of the admixture to concrete particles is further improved, the water consumption is reduced, and the performance of the concrete after the admixture is added is further enhanced, so that the performances of the concrete such as corrosion resistance, workability and the like are improved.
Preferably, the feed comprises the following raw materials in parts by weight:
35 parts of water reducing agent mother liquor
4 parts of sodium alginate
5 portions of lignosulfonate
3 portions of potassium acrylate
6 portions of polyethylene glycol
8 portions of sodium silicate
24 portions of first deionized water
2 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent.
By adopting the technical scheme, the proportion of each component in the admixture is further optimized, so that the dispersion degree of the admixture to concrete particles is better, the water consumption is less, the performance of the concrete after the admixture is added is further enhanced, and the performances of the concrete such as corrosion resistance, workability and the like are improved.
Preferably, each part of the water reducing agent mother liquor is prepared from the following components in parts by weight:
20-25 parts of polyoxyethylene allyl ester macromonomer
2-6 parts of sodium methallyl sulfonate
3-6 parts of acrylic acid
3-8 parts of mercaptoacetic acid
0.5-1 part of polyquaternium
50-60 parts of second deionized water
10-25 parts of sodium bicarbonate buffer solution;
the mass concentration of the sodium bicarbonate solution is 5-10%.
By adopting the technical scheme, the polyoxyethylene allyl ester macromonomer, acrylic acid, thioglycollic acid and sodium methallyl sulfonate are polymerized under the action of polyquaternium to obtain the polycarboxylic acid compound, the acid-ether ratio is optimized, the molecular configuration of the glue reducing agent with small molecular weight and short main chain length is obtained, and the copolymer has certain steric hindrance capability, enhances the dispersing capability and can assist other components in dispersing concrete. The sodium methallyl sulfonate has good shaping capacity and can promote the strength and the workability of concrete, the sodium bicarbonate buffer solution adjusts the pH value of the water reducer mother liquor, so that the copolymer has good molecular configuration of the water reducer, and the copolymer is mutually cooperated with the raw materials to promote the concrete to have excellent workability and physical properties.
Preferably, the pH value of the 5-10% sodium bicarbonate buffer solution is 8-9.
By adopting the technical scheme, the pH value of the water reducer mother liquor is convenient to adjust, the copolymer has a good molecular configuration of the water reducer, and the copolymer is matched with other raw materials in a mutual cooperation manner, so that the concrete has better workability and physical properties.
Preferably, the amount of the acrylic acid and the amount of the thioglycolic acid are not more than 50-60% of the amount of the polyoxyethylene allyl ester macromonomer.
By adopting the technical scheme, the acid-ether ratio is optimized, so that the copolymer forms a molecular configuration of the gel reducing agent with smaller molecular weight and shorter main chain length, the steric hindrance capability is good, and the workability and physical properties of concrete can be improved.
Preferably, the preparation process of each part of the water reducer mother liquor comprises the following steps:
s1, dissolving 3-6 parts of acrylic acid and 3-8 parts of thioglycollic acid in 10-20% of the total amount of the second deionized water according to the parts by weight, heating to 50-60 ℃, and stirring to obtain an acidic solution;
s2, weighing 2-6 parts of sodium methallyl sulfonate, 0.5-1 part of polyquaternium and 20-30% of total using amount of second deionized water according to parts by weight to prepare an initiator solution, and dropwise adding the initiator solution into an acid solution to prepare a solution A;
s3, weighing 20-25 parts of polyoxyethylene allyl ester macromonomer according to parts by weight, dissolving in 50-70% of the total amount of second deionized water to prepare polyoxyethylene allyl ester macromonomer solution, dropwise adding the polyoxyethylene allyl ester macromonomer solution into the solution A, and reacting for 1-2 hours at 50-60 ℃ to prepare solution B;
s4, weighing 10-25 parts by weight of 5-10% by mass sodium bicarbonate buffer solution, dropwise adding the sodium bicarbonate buffer solution into the solution B, and adjusting the pH to 6.5-7.5 to obtain the water reducer mother liquor.
By adopting the technical scheme, the molecular configuration of the gel reducing agent with smaller molecular weight and shorter main chain length can be obtained, the copolymer has good steric hindrance capability and better dispersing capability, and assists the concrete raw materials to be uniformly dispersed, thereby being more beneficial to improving the workability and physical properties of the concrete.
Preferably, after the sodium bicarbonate buffer solution with the mass concentration of 5-10% is added dropwise in the step S4, the pH of the prepared water reducer mother liquor is 6.9-7.1.
By adopting the technical scheme, the water reducing agent mother liquor with the pH of 6.9-7.1 can improve the net slurry fluidity of cement, increase the water reducing rate, reduce the gas content of concrete and further enhance the workability, cold resistance and corrosion resistance of the concrete.
In a second aspect, the present application provides a method for preparing a concrete admixture, which adopts the following technical scheme:
a preparation method of the concrete admixture comprises the following steps:
taking a mother solution of the water reducing agent, adding first deionized water for dilution, and uniformly stirring to obtain a first dispersion solution;
mixing sodium silicate, sodium alginate, lignosulfonate and potassium acrylate, adding first deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding other auxiliaries, and uniformly stirring to obtain the concrete admixture.
By adopting the technical scheme, after the prepared admixture is added into concrete and stirred, the admixture has good dispersion effect on concrete particles, improves the fluidity of the concrete particles, can greatly improve the workability of the concrete, further increases the cold resistance and corrosion resistance of the concrete, and simultaneously reduces the water consumption and the cement consumption.
Preferably, the sum of the amount of the sodium silicate and the amount of the sodium alginate is not more than 20-40% of the mother liquor of the water reducing agent.
By adopting the technical scheme, the dosage ratio of the sodium silicate and the sodium alginate is optimized, so that the concrete added with the additive has excellent performances of adhesion, strength, acid resistance, heat resistance, retardation and the like, and the workability of the concrete is further improved.
In summary, the present application has the following beneficial effects:
1. the water reducing agent mother liquor, the sodium alginate, the lignosulfonate, the potassium acrylate, the polyethylene glycol, the sodium silicate, the first deionized water and other auxiliaries are compounded for use, so that the bleeding rate of the concrete can be obviously reduced, the workability, the strength and the durability of the concrete are further improved, and the concrete has good performances of freezing resistance, cold resistance, water resistance and the like.
2. According to the application, the using amount ratio of the water reducing agent mother liquor, the sodium alginate, the lignosulfonate, the potassium acrylate, the polyethylene glycol, the sodium silicate, the first deionized water and other auxiliaries is optimized, the dispersity of the admixture to concrete particles is further improved, the water consumption is reduced, the performance of the concrete after the admixture is added is further enhanced, and therefore the corrosion resistance, the workability and other performances of the concrete are improved.
3. This application uses through polyoxyethylene allyl ester macromonomer, sodium methallyl sulfonate, acrylic acid, thioglycolic acid, polyquaternium, second deionized water and sodium bicarbonate buffer solution's complex formulation, and the dispersion of concrete particle can be promoted to the water-reducing agent mother liquor that makes, strengthens the intensity and the working property of concrete, further promotes performances such as corrosion-resistant, the acid resistance and the tax reduction nature of concrete.
Detailed Description
The present application will be described in further detail with reference to examples and comparative examples.
The materials used in the examples, comparative examples, preparations and comparative preparations were all commercially available, and some of the raw materials were obtained from the following sources and models:
polyoxyethylene allyl ester macromonomer was purchased from Saint Chengyang chemical Co., Ltd, Hebei, model 002.
Polyethylene glycol was purchased from the chemical company Limited, Teng, and the grade was technical.
The waterborne epoxy resin is purchased from Shandonghua chemical industry Co., Ltd, and has the model number of E446101.
Sodium silicate is purchased from Shandong Xin Runji chemical Co., Ltd, model number Xin Runji 909.
The defoamer is purchased from Jinan Junteng chemical industry Co., Ltd, and the execution standard is the national standard.
The air entraining agent is purchased from commercial and trade company Limited in Jinchuan of Jinan, and the grade is industrial grade.
Preparation example of Water-reducing mother liquor
Preparation example 1
A water reducing agent mother liquor comprises the following steps:
s1, weighing 3 kg of acrylic acid and 3 kg of thioglycollic acid, dissolving in 5 kg of second deionized water, heating to 50 ℃, and uniformly stirring to obtain an acid solution;
s2, weighing 2 kg of sodium methallyl sulfonate and 0.5 kg of polyquaternium, dissolving in 10 kg of second deionized water to prepare an initiator solution, and dropwise adding the initiator solution into the acid solution to prepare a solution A;
s3, weighing 20 kg of polyoxyethylene allyl ester macromonomer, dissolving in 35 kg of second deionized water to prepare polyoxyethylene allyl ester macromonomer solution, dropwise adding the polyoxyethylene allyl ester macromonomer solution into the solution A, and reacting for 1h at 50 ℃ to prepare solution B;
s4, weighing 10 kg of sodium bicarbonate buffer solution with the mass concentration of 5% and dropwise adding the sodium bicarbonate buffer solution into the solution B, and adjusting the pH to 6.5 to obtain the water reducer mother liquor.
Preparation example 2
A water reducing agent mother liquor comprises the following steps:
s1, weighing 5 kg of acrylic acid and 5 kg of thioglycollic acid, dissolving in 8.25 kg of second deionized water, heating to 55 ℃, and stirring to obtain an acidic solution;
s2, weighing 4 kg of sodium methallyl sulfonate and 0.8 kg of polyquaternium, dissolving in 13.75 kg of second deionized water to obtain an initiator solution, and dropwise adding the initiator solution into the acidic solution to obtain a solution A;
s3, weighing 23 kg of polyoxyethylene allyl ester macromonomer, dissolving in 27.5 kg of second deionized water to prepare polyoxyethylene allyl ester macromonomer solution, dropwise adding the polyoxyethylene allyl ester macromonomer solution into the solution A, and reacting for 1.5h at 55 ℃ to prepare solution B;
s4, weighing 23 kg of sodium bicarbonate with the mass concentration of 5%, dropwise adding the sodium bicarbonate into the solution B, and adjusting the pH to 7 to obtain the water reducer mother liquor.
Preparation example 3
A water reducing agent mother liquor comprises the following steps:
s1, weighing 6 kg of acrylic acid and 8 kg of thioglycolic acid, dissolving in 12 kg of second deionized water, heating to 60 ℃, and stirring to obtain an acidic solution;
s2, weighing 6 kg of sodium methallyl sulfonate and 1 kg of polyquaternium, dissolving in 18 kg of second deionized water to prepare an initiator solution, and dropwise adding the initiator solution into the acidic solution to prepare a solution A;
s3, weighing 25 kg of polyoxyethylene allyl ester macromonomer, dissolving the polyoxyethylene allyl ester macromonomer in 30 kg of second deionized water to prepare polyoxyethylene allyl ester macromonomer solution, dropwise adding the polyoxyethylene allyl ester macromonomer solution into the solution A, and reacting for 2h at 60 ℃ to prepare solution B;
s4, weighing 25 kg of sodium bicarbonate with the mass concentration of 5%, dropwise adding the sodium bicarbonate into the solution B, and adjusting the pH to 7 to obtain the water reducer mother liquor.
Comparative preparation example
Comparative preparation example 1
The comparative preparation example differs from comparative example 3 in that: 14 kg of acrylic acid was weighed out and dissolved in 20 kg of second deionized water, and the remaining amounts and steps were identical to those in preparation example 3.
Preparation of comparative example 2
The comparative preparation example differs from comparative example 3 in that: 14 kg of thioglycolic acid was weighed out and dissolved in 20 kg of second deionized water, and the remaining amounts and steps were identical to those of preparation example 3.
Comparative preparation example 3
The comparative preparation example differs from comparative example 3 in that: an equivalent amount of polyquaternium was replaced with ammonium persulfate, and the remaining amounts and procedures were identical to those of preparation example 3.
Comparative preparation example 4
The comparative preparation example differs from comparative example 3 in that: the equivalent amount of sodium bicarbonate was replaced with 10% by mass of strong sodium oxide, and the remaining amounts and steps were identical to those of preparation example 3.
Examples
Example 1
A concrete admixture is prepared by the following steps:
weighing 3.8 kg of mother liquor of a commercially available water reducing agent, adding 1.3 kg of first deionized water for dilution, and uniformly stirring to prepare a first dispersion liquid;
weighing and mixing 0.9 kg of sodium silicate, 0.5 kg of sodium alginate, 0.6 kg of lignosulfonate and 0.4 kg of potassium acrylate, adding 1.3 kg of first deionized water and 0.6 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.1 kg of defoaming agent and 0.2 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Example 2
A concrete admixture is prepared by the following steps:
weighing 3 kg of water reducer mother liquor from preparation example 1, adding 1 kg of first deionized water for dilution, and uniformly stirring to prepare a first dispersion liquid;
weighing and mixing 0.5 kg of sodium silicate, 0.2 kg of sodium alginate, 0.3 kg of lignosulfonate and 0.2 kg of potassium acrylate, adding 1 kg of first deionized water and 0.4 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.05 kg of defoaming agent and 0.05 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Example 3
A concrete admixture is prepared by the following steps:
weighing 4 kg of water reducer mother liquor from preparation example 2, adding 1.5 kg of first deionized water for dilution, and uniformly stirring to prepare a first dispersion liquid;
weighing and mixing 0.6 kg of sodium silicate, 0.6 kg of sodium alginate, 0.7 kg of lignosulfonate and 0.5 kg of potassium acrylate, adding 1.5 kg of first deionized water and 0.8 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.1 kg of defoaming agent and 0.2 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Example 4
A concrete admixture is prepared by the following steps:
weighing 3.8 kg of the mother liquor of the water reducing agent from preparation example 3, adding 1.3 kg of first deionized water for dilution, and uniformly stirring to prepare a first dispersion liquid;
weighing and mixing 0.9 kg of sodium silicate, 0.5 kg of sodium alginate, 0.6 kg of lignosulfonate and 0.4 kg of potassium acrylate, adding 1.3 kg of first deionized water and 0.6 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.1 kg of defoaming agent and 0.2 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Example 5
A concrete admixture is prepared by the following steps:
weighing 3.5 kg of the water reducing agent mother liquor from preparation example 3, adding 1.2 kg of first deionized water for dilution, and uniformly stirring to prepare a first dispersion liquid;
weighing and mixing 0.8 kg of sodium silicate, 0.4 kg of sodium alginate, 0.5 kg of lignosulfonate and 0.3 kg of potassium acrylate, adding 1.2 kg of first deionized water and 0.6 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.1 kg of defoaming agent and 0.1 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Example 6
This embodiment is different from embodiment 5 in that: the water reducing agent mother liquor is from preparation example 1, and the rest amount and steps are consistent with those of example 5.
Example 7
This embodiment is different from embodiment 5 in that: the water reducing agent mother liquor is from preparation example 2, and the rest amount and steps are consistent with those of example 5.
Example 8
The present embodiment is different from embodiment 5 in that: the water reducer mother liquor is from preparation comparative example 1, and the rest of the amount and the steps are consistent with those in example 5.
Example 9
This embodiment is different from embodiment 5 in that: the water reducing agent mother liquor comes from preparation comparative example 2, and the rest of the amount and the steps are consistent with those of example 5.
Example 10
This embodiment is different from embodiment 5 in that: the water reducer mother liquor is from preparation comparative example 3, and the rest of the amount and the steps are consistent with those in example 5.
Example 11
This comparative example differs from example 5 in that: the water reducer mother liquor was from preparative comparative example 4, with the remaining amounts and steps being in accordance with example 5.
Comparative example
Comparative example 1
A concrete admixture is prepared by the following steps:
weighing 2 kg of water reducer mother liquor from preparation example 3, adding 0.8 kg of first deionized water for dilution, and uniformly stirring to obtain a first dispersion liquid;
weighing and mixing 1 kg of sodium silicate, 0.7 kg of sodium alginate, 0.8 kg of lignosulfonate and 0.6 kg of potassium acrylate, adding 0.8 kg of first deionized water and 0.9 kg of polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding 0.1 kg of defoaming agent and 0.2 kg of air entraining agent, and uniformly stirring to obtain the concrete admixture.
Comparative example 2
This comparative example differs from example 5 in that: the same amount of carboxymethylcellulose was used in place of the same amount of polyethylene glycol and the same amount of organobentonite was used in place of the same amount of sodium silicate, and the remaining amounts and steps were the same as in example 5.
Comparative example 3
This comparative example differs from example 5 in that: the same amount of sodium hexametaphosphate was used in place of potassium acrylate and the same amount of organobentonite was used in place of sodium silicate, and the remaining amounts and steps were the same as in example 5.
Comparative example 4
This comparative example differs from example 5 in that: equivalent amounts of gelatin were used in place of equivalent amounts of polyethylene glycol and equivalent amounts of sodium methyl benzene sulfonate were used in place of equivalent amounts of lignosulfonate, the remaining amounts and procedures being in accordance with example 5.
Comparative example 5
This comparative example differs from example 5 in that: the same amount of aqueous epoxy resin was used in place of the polyethylene glycol and the same amount of citrate was used in place of the same amount of potassium acrylate, and the remaining amounts and steps were the same as in example 5.
TABLE 1 sources of water reducer mother liquor in examples and comparative examples
Performance test
The concrete admixtures prepared in the above examples and comparative examples were mixed to prepare different concrete according to the design criteria of general concrete mix design rules (JGJ55), and the concrete was tested for water reducing rate, bleeding rate, initial slump, 1h slump, 7d compressive strength, and 28d compressive strength.
Detection method/test method
The water reduction rate of the concrete was tested according to GB 8076-2008.
Bleeding rate: the test is carried out according to the bleeding and pressure bleeding test in GB/T50080-2002 Standard of Performance test methods of common concrete mixtures.
Slump: the slump of the concrete mixtures prepared in the examples and the comparative examples when taken out of the machine is tested according to GB/T50080-2016 standard of test method for the performance of common concrete mixtures.
Standard test blocks of the benchmark concrete of each embodiment and each comparative example are manufactured according to GB/T50081-2002 Standard test method for mechanical properties of ordinary concrete, and the compressive strength of the benchmark test blocks of the standard test blocks is measured after 7-28 days of maintenance.
Table 2 performance testing experimental data
By combining the examples 1 to 11 and the comparative examples 1 to 5 and combining the table 2, the numerical values of the compressive strength at 7d, the compressive strength at 28d and the water reducing rate in the examples 1 to 11 are all higher than those in the comparative examples 1 to 5, the numerical value of the example 5 is the highest, the water bleeding rate in the examples 1 to 11 is lower than those in the comparative examples 1 to 5, and the numerical value of the example 5 is the lowest, which shows that the additive can improve the fluidity, the water bleeding resistance and the compressive strength of concrete particles, and simultaneously, the concrete has good freezing resistance and impermeability, and the effect of the example 5 is better.
In addition, the change of the 1h slump constant in examples 1 to 11 is less than 11mm, and the change of the 1h slump constant in comparative examples 1 to 5 is more than 11mm, which shows that the concrete admixture prepared from the raw materials of the concrete admixture improves the viscosity of a concrete system, reduces the initial fluidity of the concrete, fills gaps among concrete particles due to the increase of the viscosity of the system, reduces the over-time slump and the over-time loss of the concrete, namely ensures the fluidity of the concrete during pouring, and ensures the workability of the concrete.
The concrete prepared in the embodiment 1 is prepared from the commercially available admixture, the test results of the concrete are that the numerical values of 7d compressive strength, 28d compressive strength and water reducing rate are all higher than those of comparative examples 1-5 and lower than those of embodiments 2-7 of the application, and the bleeding rate in the embodiment 1 is lower than those of comparative examples 1-5 and higher than those of embodiments 2-7 of the application, so that the admixture prepared in the application is matched with the concrete to be used, and the concrete has better performances such as bleeding resistance, compressive strength, frost resistance, impermeability and the like.
By combining the examples 5 and 8-11 and the table 2, the test results of the concrete of the examples 8-11 show that the values of the compressive strength at 7d, the compressive strength at 28d, the initial slump, the slump at 1h and the water reducing rate are all lower than those of the concrete of the example 5, and the values of the water bleeding rate are all higher than those of the concrete of the example 5, which indicates that the raw material formula and the dosage of the water reducing agent mother liquor are optimized, so that the concrete has better performances such as bleeding resistance, compressive strength, frost resistance and impermeability.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The concrete admixture is characterized by comprising the following raw materials in parts by weight:
30-40 parts of water reducer mother liquor
2-6 parts of sodium alginate
3-7 parts of lignosulfonate
2-5 parts of potassium acrylate
4-8 parts of polyethylene glycol
5-9 parts of sodium silicate
20-30 parts of first deionized water
1-3 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent;
each part of the water reducing agent mother liquor is prepared from the following components in parts by weight:
20-25 parts of polyoxyethylene allyl ester macromonomer
2-6 parts of sodium methallyl sulfonate
3-6 parts of acrylic acid
3-8 parts of mercaptoacetic acid
0.5-1 part of polyquaternium
50-60 parts of second deionized water
10-25 parts of sodium bicarbonate buffer solution;
the mass concentration of the sodium bicarbonate buffer solution is 5-10%.
2. The concrete admixture according to claim 1, which comprises the following raw materials in parts by weight:
34-38 parts of mother liquor of water reducing agent
3-5 parts of sodium alginate
4-6 parts of lignosulfonate
3-4 parts of potassium acrylate
5-6 parts of polyethylene glycol
7-9 parts of sodium silicate
22-26 parts of first deionized water
2-3 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent.
3. The concrete admixture according to claim 2, comprising the following raw materials in parts by weight:
35 parts of water reducing agent mother liquor
4 parts of sodium alginate
5 portions of lignosulfonate
3 portions of potassium acrylate
6 portions of polyethylene glycol
Sodium silicate 8 parts
24 portions of first deionized water
2 parts of other auxiliary agents;
the other auxiliary agents comprise a defoaming agent and an air entraining agent.
4. A concrete admixture according to claim 1, wherein: the pH value of the sodium bicarbonate buffer solution with the mass concentration of 5% is 8-9.
5. A concrete admixture according to claim 4, wherein: the total using amount of the acrylic acid and the thioglycolic acid is not more than 50-60% of the using amount of the polyoxyethylene allyl ester macromonomer.
6. A concrete admixture according to claim 1, wherein: the preparation process of each part of the water reducer mother liquor comprises the following steps:
s1, dissolving 3-6 parts of acrylic acid and 3-8 parts of thioglycollic acid in 10-20% of the total amount of the second deionized water according to the parts by weight, heating to 50-60 ℃, and stirring to obtain an acidic solution;
s2, weighing 2-6 parts of sodium methallyl sulfonate, 0.5-1 part of polyquaternium and 20-30% of the total amount of second deionized water according to parts by weight to prepare an initiator solution, and dropwise adding the initiator solution into an acidic solution to prepare a solution A;
s3, weighing 20-25 parts of polyoxyethylene allyl ester macromonomer according to parts by weight, dissolving in 50-70% of the total amount of second deionized water to prepare polyoxyethylene allyl ester macromonomer solution, dropwise adding the polyoxyethylene allyl ester macromonomer solution into the solution A, and reacting for 1-2 hours at 50-60 ℃ to prepare solution B;
s4, weighing 10-25 parts by weight of 5-10% by mass sodium bicarbonate buffer solution, dropwise adding the sodium bicarbonate buffer solution into the solution B, and adjusting the pH to 6.5-7.5 to obtain the water reducer mother liquor.
7. A concrete admixture according to claim 6 wherein: and S4, after dropwise adding a sodium bicarbonate buffer solution with the mass concentration of 5-10%, the pH of the prepared water reducer mother liquor is 6.9-7.1.
8. A method for producing the concrete admixture according to any one of claims 1 to 7, characterized by: the method comprises the following steps:
taking a mother solution of the water reducing agent, adding first deionized water for dilution, and uniformly stirring to obtain a first dispersion solution;
mixing sodium silicate, sodium alginate, lignosulfonate and potassium acrylate, adding first deionized water and polyethylene glycol, and uniformly stirring to prepare a second dispersion liquid;
and uniformly mixing the first dispersion liquid and the second dispersion liquid, adding other auxiliaries, and uniformly stirring to obtain the concrete admixture.
9. The method for preparing a concrete admixture according to claim 8, wherein: the total dosage of the sodium silicate and the sodium alginate is not more than 20-40% of the mother liquor of the water reducing agent.
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| CN103265199A (en) * | 2013-04-18 | 2013-08-28 | 张家港市创新化学石膏制品有限公司 | High-efficient water reducer and preparation method thereof |
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