CN111423154B - Concrete glue reducing agent and preparation method thereof - Google Patents
Concrete glue reducing agent and preparation method thereof Download PDFInfo
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- CN111423154B CN111423154B CN202010140827.8A CN202010140827A CN111423154B CN 111423154 B CN111423154 B CN 111423154B CN 202010140827 A CN202010140827 A CN 202010140827A CN 111423154 B CN111423154 B CN 111423154B
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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
Abstract
The invention discloses a concrete gel reducing agent and a preparation method thereof, relating to the technical field of concrete admixtures, and the technical scheme is that the concrete gel reducing agent is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate and the balance of water. The concrete glue reducing agent has the advantages of reducing the using amount of cement, improving the fluidity of concrete mixture and the wrapping property of cement to aggregate, thereby improving the workability of concrete.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a concrete glue reducing agent and a preparation method thereof.
Background
The common concrete is artificial stone which is prepared by taking cement as a main cementing material, mixing with water, sand, stones and a certain amount of chemical additives and mineral admixtures as necessary according to a proper proportion, and stirring, compacting, molding, curing and hardening. The concrete is a novel concrete additive different from a concrete water reducing agent, and the glue reducing agent is also called a concrete synergist or a concrete synergist, and has the main effects of improving the workability of the concrete, increasing the overall glue amount of the concrete, promoting the hydration reaction of the cement to be more sufficient, reducing the using amount of the cement or other cementing materials, and further reducing the problems of concrete surface cracks and the like caused by cement hydration heat.
In the prior art, a Chinese patent with an authorization publication number of CN103787609B discloses a glue reducing agent for concrete and a preparation method thereof, wherein the glue reducing agent comprises the following formula components: 25-45% of mixed alcohol amine, 5-20% of mixed alcohol, 5-15% of melamine high-efficiency water reducing agent, 2-5% of catalyst and the balance of water. The main component of the gel reducing agent is an alcamine composition, such as triethanolamine, and the action mechanism of the gel reducing agent is that the triethanolamine promotes the dissolution of minerals and promotes the formation of C-S-H gel, thereby promoting the hydration reaction of cement and reducing the actual dosage of the cement.
Cement is used as a cementing material and mainly used for bonding aggregates such as sand, stones and the like, sand used for concrete can be divided into natural sand and machine-made sand (artificial sand), the natural sand refers to rock particles which are formed under the action of natural conditions and have the particle size of less than 5mm, and the natural sand is mainly divided into river sand, sea sand and mountain sand; machine-made sand refers to rock particles having a particle size of less than 4.75mm after mechanical crushing. The natural sand particles are round and smooth in surface and are fine aggregate used by traditional concrete, but the natural sand has gradually increased price due to less and less resources because of mining for many years, and the machine-made sand has sufficient raw materials and lower price, so the natural sand is gradually replaced or partially replaced to become the fine aggregate of the concrete; but compared with natural sand, the machine-made sand has the advantages that the particle shape is not smooth enough, the particles have sharp edges and corners, the stone powder content is higher, and the water demand is larger, and when the stone powder content in the machine-made sand is too high, the viscosity of a concrete mixture can be increased, the dispersibility of the cement particles can be influenced, the dispersibility of the gel reducing agent on the cement particles can be inhibited, so that the traditional gel reducing agent cannot play a good role, the wrapping property of cement on aggregate is influenced, the concrete is caused to have bleeding and segregation phenomena, and the workability of the concrete is influenced.
Disclosure of Invention
In view of the defects of the prior art, the first object of the invention is to provide a concrete gel reducing agent which has the advantages of reducing the using amount of cement, improving the fluidity of concrete mixture and the wrapping property of cement to aggregate, thereby improving the workability of concrete.
The second purpose of the invention is to provide a preparation method of the coagulation gel reducer, which has the advantages of simple operation and high production efficiency.
In order to achieve the first object, the invention provides the following technical scheme: the concrete gel reducing agent is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate and the balance of water.
By adopting the technical scheme, the anhydrous sodium metasilicate, the lithium silicate and the sodium methylsilicate belong to silicate, and the aqueous solution of the silicate is alkalescent; the glue reducing agent obtained by combining the mixed alcohol amine with the silicate has good stability; the stone powder of the machine-made sand is generally calcareous stone powder and siliceous stone powder, and the increase of the content of the stone powder can improve the water absorption, influence the dispersibility of cement particles and increase the viscosity of concrete mixtures; through the matching of sodium metasilicate, lithium silicate and sodium methylsilicate, the siliceous stone powder can form a stable microcolloid after being combined with water so as to inhibit the combination of part of stone powder and cement, and the dispersion of mixed alcohol amine on cement particles is facilitated; the micro colloid formed by the siliceous stone powder is in a crystalline state, and can further stimulate the hydration action of the mixed alcohol amine on minerals in the cement, so that the concrete has good early strength and later strength through the action of different hydration products; through the cooperation of sodium metasilicate, methyl sodium silicate and mixed alcohol amine, can improve the permeability of mixed alcohol amine in cement, make it promote cement to carry out hydration reaction fast to improve the dispersibility of cement granule, effectively improve the utilization ratio of cement granule, under the prerequisite that reduces the cement quantity, improve the wrapping nature of cement to the aggregate, reduce the circumstances such as segregation, the bleeding of concrete, be favorable to improving the mobility of concrete mixture, improve its workability.
Further, the aqueous polyurethane emulsion is prepared by diluting mother liquor with water, and comprises the following components in 100 parts by weight of the mother liquor: 50 parts of mixed alcohol amine, 5 parts of anhydrous sodium metasilicate, 6 parts of lithium silicate, 18 parts of sodium methyl silicate and the balance of water.
By adopting the technical scheme, the prepared mother liquor is reasonable in proportion, the dispersibility of cement particles can be improved, the utilization rate of the cement particles is effectively improved, the wrapping property of cement to aggregate is improved on the premise of reducing the cement using amount, the segregation and bleeding of concrete are reduced, the improvement on the fluidity of concrete mixtures is facilitated, and the workability of the concrete mixtures is improved.
Further, the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1.125: 1.
By adopting the technical scheme, the mixed alcohol amine obtained by mixing the triethanolamine, the triisopropanolamine and the diethanolamine is used as the main component of the concrete gel reducing agent, so that the micro-dispersion effect can be generated on cement particles; the triethanolamine has the effect of promoting mineral dissolution and can promote the formation of C-S-H gel; triisopropanolamine can promote hydration of ferrite which is difficult to hydrate so as to promote hydration degree of cement minerals, and for machine-made sand concrete with high stone powder content, triethanolamine, triisopropanolamine and diethanolamine are compounded in a ratio of 1:1.125:1, and the existence of the diethanolamine can promote activity of the triethanolamine and the triisopropanolamine, so that cement particles can be rapidly dispersed, influence of machine-made sand powder and dispersion of the cement particles is inhibited, hydration reaction of cement is improved, utilization rate of the cement is improved, and wrapping property of the cement on aggregates is improved on the premise of reducing cement consumption.
Further, the mother liquor also comprises 3-5 parts of polycarboxylic acid water reducing agent;
the polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of alpha-alkenyl sodium sulfonate, 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 40-60 parts of methallyl alcohol polyoxyethylene ether.
By adopting the technical scheme, the polycarboxylic acid water reducing agent has the advantage of high water reducing rate, can effectively reduce the water demand of concrete, can play a role in reducing water by adding the polycarboxylic acid water reducing agent into the water reducing agent, improves the fluidity, cohesiveness and water-retaining property of concrete mixtures, and effectively improves the workability of concrete; and the dosage of the external water reducing agent in the concrete formula can be reduced, even no additional water reducing agent is needed to be added, the problem of poor adaptability of the glue reducing agent and different types of external water reducing agents is solved, and the design of the concrete formula is simpler and more reasonable.
Further, the polycarboxylic acid water reducing agent is prepared by the following method: taking 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of alpha-alkenyl sulfonate and 50-60 parts of water by weight parts, and uniformly stirring to obtain a mixed solution A;
uniformly stirring 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 10-15 parts of water to obtain a mixed solution B;
taking 40-60 parts of methallyl alcohol polyoxyethylene ether and 50-70 parts of water, heating to 45-50 ℃, adding the mixed solution B, stirring for 1-2h, adding the mixed solution A, dropwise adding for 3-4h, then adding 100 parts of water, stirring for 3-4h at the temperature of 45-50 ℃, and then adding alkali liquor to adjust the pH of the system to 6-8, thereby obtaining the polycarboxylic water reducer.
By adopting the technical scheme, the methyl allyl alcohol polyoxyethylene ether and the monomer are subjected to polymerization reaction under the action of the chain transfer agent, the operation is simple, and the realization is easy.
Further, the chain transfer agent is one of mercaptopropionic acid and mercaptoacetic acid.
Further, the initiator is formed by mixing ammonium persulfate and ascorbic acid in a weight ratio of 3: 1.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of the concrete gel reducing agent comprises the following steps:
s1, adding anhydrous sodium metasilicate and sodium methylsilicate into a certain amount of water according to a proportion, and uniformly stirring to obtain a mixed solution;
s2, adding mixed alcohol amine and lithium silicate into the mixed solution, and uniformly stirring to obtain mother solution;
and S3, adding water into the mother liquor for dilution to obtain the concrete glue reducing agent.
By adopting the technical scheme, the anhydrous sodium metasilicate and the sodium methylsilicate are mixed and then added with the mixed alcohol amine and the lithium silicate in sequence, and the obtained gel reducing agent has stable performance and simple operation.
Further, the stirring speed in S2 is 200-600r/min, and the stirring time is 20-30 min.
By adopting the technical scheme, the raw materials are stirred at the speed of 200-600r/min, so that the raw materials can be fully dispersed in water to form a stable alkaline micro-colloidal solution.
Further, the ratio of mother liquor to water in S3 was 1: 14.
By adopting the technical scheme, the mother liquor and the water are mixed and diluted according to the proportion of 1:14, and the prepared glue reducing agent has good adaptability to concrete with different proportions.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the dispersion of the mixed alcohol amine to cement particles can be improved by the matching of the sodium metasilicate, the lithium silicate and the sodium methylsilicate, the hydration action of the mixed alcohol amine to minerals in the cement is further stimulated, and the concrete has good early strength and later strength by the action of different hydration products; the permeability of the mixed alcohol amine in the cement can be improved by matching the sodium metasilicate, the sodium methylsilicate and the mixed alcohol amine, so that the cement can be promoted to rapidly carry out hydration reaction, the dispersibility of cement particles is improved, the utilization rate of the cement particles is effectively improved, the wrapping property of the cement to the aggregate is improved on the premise of reducing the using amount of the cement, the conditions of segregation, bleeding and the like of the concrete are reduced, the improvement of the fluidity of a concrete mixture is facilitated, and the workability of the concrete mixture is improved;
2. after triethanolamine, triisopropanolamine and diethanolamine are compounded in a ratio of 1:1.125:1, the existence of the diethanolamine can promote the activity of the triethanolamine and the triisopropanolamine, so that the triethanolamine and the triisopropanolamine can be rapidly dispersed in cement particles, and the influence of machine-made sandstone powder and the dispersibility of the cement particles is inhibited, so that the hydration reaction of cement is improved, the utilization rate of the cement is improved, and the wrapping property of the cement on aggregate is improved on the premise of reducing the cement consumption;
3. the polycarboxylic acid water reducing agent has the advantage of high water reducing rate, can effectively reduce the water demand of concrete, can play a role of reducing water by adding the polycarboxylic acid water reducing agent into the water reducing agent, improves the fluidity, cohesiveness and water retention of concrete mixtures, and effectively improves the workability of the concrete; and the dosage of the external water reducing agent in the concrete formula can be reduced, even no additional water reducing agent is needed to be added, the problem of poor adaptability of the glue reducing agent and different types of external water reducing agents is solved, and the design of the concrete formula is simpler and more reasonable.
Detailed Description
The present invention will be described in further detail below.
Preparation example of polycarboxylic acid Water reducing agent
Preparation example 1 of polycarboxylic acid-based water reducing agent: uniformly stirring 12.5kg of acrylic acid, 4kg of acrylamide, 1.5kg of hydroxyethyl methacrylate, 0.3kg of isobutyl methacrylate, 2.5kg of sodium methallylsulfonate, 0.25kg of alpha-sodium alkenyl sulfonate and 55kg of water to obtain a mixed solution A;
0.15kg of mercaptopropionic acid, 0.3kg of ammonium persulfate, 0.1kg of ascorbic acid and 12.5kg of water are uniformly stirred to obtain a mixed solution B;
③ taking 50kg of methallyl alcohol polyoxyethylene ether and 60kg of water, heating to 48 ℃, adding the mixed solution B, stirring for 1.5h, adding the mixed solution A, dropwise adding for 3.5h, then adding 100kg of water, stirring for 3.5h at 48 ℃, then adding 10 wt% of sodium hydroxide solution, and adjusting the pH value of the system to 7 to obtain the polycarboxylic acid water reducer.
Preparation example 2 of polycarboxylic acid-based water reducing agent: taking 10kg of acrylic acid, 3kg of acrylamide, 1kg of hydroxyethyl methacrylate, 0.2kg of isobutyl methacrylate, 2kg of sodium methallyl sulfonate, 0.2kg of alpha-sodium alkenyl sulfonate and 50kg of water, and uniformly stirring to obtain a mixed solution A;
0.1kg of thioglycolic acid, 0.225kg of ammonium persulfate, 0.075kg of ascorbic acid and 10kg of water are uniformly stirred to obtain a mixed solution B;
and thirdly, taking 40kg of methallyl alcohol polyoxyethylene ether and 50kg of water, heating to 45 ℃, adding the mixed solution B, stirring for 1h, adding the mixed solution A, dropwise adding for 3h, then adding 100kg of water, stirring for 3h at the temperature of 45 ℃, then adding 10 wt% of sodium hydroxide solution, and adjusting the pH of the system to be 6 to obtain the polycarboxylic acid water reducer.
Preparation example 3 of polycarboxylic acid-based water reducing agent: taking 15kg of acrylic acid, 5kg of acrylamide, 2kg of hydroxyethyl methacrylate, 0.4kg of isobutyl methacrylate, 3kg of sodium methallyl sulfonate, 0.3kg of alpha-sodium alkenyl sulfonate and 60kg of water, and uniformly stirring to obtain a mixed solution A;
uniformly stirring 0.2kg of mercaptopropionic acid, 0.375kg of ammonium persulfate, 0.125kg of ascorbic acid and 15kg of water to obtain a mixed solution B;
and thirdly, heating 60kg of methallyl alcohol polyoxyethylene ether and 70kg of water to 50 ℃, adding the mixed solution B, stirring for 2 hours, adding the mixed solution A, dropwise adding for 4 hours, then adding 100kg of water, stirring for 4 hours at a temperature of 50 ℃, then adding 10 wt% of sodium hydroxide solution, and adjusting the pH of the system to be 8 to obtain the polycarboxylic acid water reducer.
Examples
Example 1: the concrete glue reducing agent is prepared by adopting the following method:
s1, adding 21kg of water into a stirring tank, then adding 5kg of anhydrous sodium metasilicate and 18kg of sodium methyl silicate, and uniformly stirring to obtain a mixed solution;
s2, adding 16kg of triethanolamine, 18kg of triisopropanolamine, 16kg of diethanolamine and 6kg of lithium silicate into the mixed solution, and stirring at the speed of 400r/min for 20min to obtain mother liquor;
and S3, diluting the mother liquor and water according to the ratio of 1:14 to obtain the concrete gel reducer.
Example 2: the concrete glue reducing agent is prepared by adopting the following method:
s1, adding 31kg of water into a stirring tank, then adding 4kg of anhydrous sodium metasilicate and 15kg of sodium methyl silicate, and uniformly stirring to obtain a mixed solution;
s2, adding 14.4kg of triethanolamine, 16.2kg of triisopropanolamine, 14.4kg of diethanolamine and 5kg of lithium silicate into the mixed solution, and stirring at the speed of 200r/min for 30min to obtain mother liquor;
and S3, diluting the mother liquor and water according to the ratio of 1:14 to obtain the concrete gel reducer.
Example 3: the concrete glue reducing agent is prepared by adopting the following method:
s1, adding 12kg of water into a stirring tank, then adding 6kg of anhydrous sodium metasilicate and 20kg of sodium methyl silicate, and uniformly stirring to obtain a mixed solution;
s2, adding 17.6kg of triethanolamine, 19.8kg of triisopropanolamine, 17.6kg of diethanolamine and 7kg of lithium silicate into the mixed solution, and stirring at the speed of 600r/min for 25min to obtain mother liquor;
and S3, diluting the mother liquor and water according to the ratio of 1:14 to obtain the concrete gel reducer.
Example 4: this example is different from example 1 in that 4kg of a polycarboxylic acid-based water reducing agent selected from those prepared in preparation example 1 of the polycarboxylic acid-based water reducing agent was further added to S2.
Example 5: this example is different from example 4 in that the amount of the polycarboxylic acid-based water-reducing agent used was 3 kg.
Example 6: this example is different from example 4 in that the amount of the polycarboxylic acid-based water-reducing agent used was 5 kg.
Example 7: this example is different from example 4 in that the polycarboxylic acid type water reducing agent is selected from those prepared in preparation example 2 of the polycarboxylic acid type water reducing agent.
Example 8: this example is different from example 4 in that the polycarboxylic acid type water reducing agent is selected from those prepared in preparation example 3 of the polycarboxylic acid type water reducing agent.
Comparative example
Comparative example 1: the comparative example differs from example 1 in that the weight ratio of triethanolamine, triisopropanolamine, and diethanolamine is 1:1: 1.
Comparative example 2: this comparative example differs from example 1 in that anhydrous sodium metasilicate and sodium methylsilicate were replaced with the same amount of water.
Comparative example 3: this comparative example differs from example 1 in that anhydrous sodium metasilicate and lithium silicate were replaced with the same amount of water.
Comparative example 4: this comparative example differs from example 1 in that sodium methyl silicate and lithium silicate are replaced with equal amounts of water.
Comparative example 5: the difference between the comparative example and the example 4 is that the polycarboxylic acid water reducer is selected from FS-2080 polycarboxylic acid water reducers provided by Shenzhen, same Zhouda scientific and technological development Limited.
Performance testing
The glue reducing agents prepared in examples 1 to 8 and comparative examples 1 to 3 were applied to concrete, and the raw material formulation is shown in table 1. Wherein the cement is P.O42.5 ordinary portland cement of conch; the sand is machine-made sand, the content of stone powder is 15 percent, and the fineness modulus is 2.4; the stones are basalt broken stones with 5-25mm continuous gradation; the water reducer is an FS-2080 polycarboxylic acid water reducer provided by Shenzhen, Shanzhouda science and technology development Limited company. The performance of the concrete is tested according to GB/T50080-2016 Standard test method for Performance of common concrete mixtures and GB/T50081-2019 Standard test method for physical and mechanical Properties of concrete, and the test results are shown in Table 2.
TABLE 1 dosage of concrete raw materials, kg/m, for examples 1-8 and comparative examples 1-53
| Item | Cement | Sand | Stone | Water (W) | Water reducing agent | Glue reducing agent |
| Blank example | 360 | 750 | 1050 | 180 | 5 | / |
| Example 1 | 334 | 750 | 1050 | 180 | 5 | 2.85 |
| Example 2 | 335 | 750 | 1050 | 180 | 5 | 2.92 |
| Example 3 | 335 | 750 | 1050 | 180 | 5 | 2.82 |
| Example 4 | 323 | 750 | 1050 | 180 | 1.5 | 3.00 |
| Example 5 | 324 | 750 | 1050 | 180 | 1.5 | 3.12 |
| Example 6 | 323 | 750 | 1050 | 180 | 1.5 | 2.98 |
| Example 7 | 326 | 750 | 1050 | 180 | 1.5 | 3.05 |
| Example 8 | 325 | 750 | 1050 | 180 | 1.5 | 3.13 |
| Comparative example 1 | 338 | 750 | 1050 | 180 | 5 | 2.85 |
| Comparative example 2 | 342 | 750 | 1050 | 180 | 5 | 2.85 |
| Comparative example 3 | 339 | 750 | 1050 | 180 | 5 | 2.85 |
| Comparative example 4 | 340 | 750 | 1050 | 180 | 5 | 2.85 |
| Comparative example 5 | 331 | 750 | 1050 | 180 | 5.0 | 3.00 |
As can be seen from the data in Table 1, the cement dosage can be reduced by about 7% after the gel reducing agent of the embodiments 1 to 3 of the invention is added, and the cement dosage can be reduced by about 10% after the gel reducing agent of the embodiments 4 to 8 of the invention is added, and the dosage of the water reducing agent in the concrete formula can also be effectively reduced.
In the comparative example 1, the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1: 1; compared with example 1, the required cement amount is obviously increased under the condition of using the same amount of the glue reducing agent, which shows that the effect of reducing the cement amount is better when the weight ratio of the triethanolamine, the triisopropanolamine and the diethanolamine is 1:1.125: 1.
Comparative example 2 anhydrous sodium metasilicate and sodium methylsilicate were replaced with equal amounts of water; in comparative example 3, anhydrous sodium metasilicate and lithium silicate were replaced with the same amount of water; in comparative example 4, sodium methyl silicate and lithium silicate were replaced with equal amounts of water. In comparison with example 1, the amount of cement required was significantly increased by using the cement reducing agents of comparative examples 2 to 4 in the case of using the same amount of the cement reducing agent, which shows that when anhydrous sodium metasilicate, sodium methyl silicate and lithium silicate were used in combination, there was a synergistic effect, and the cement amount reducing effect of the cement reducing agent prepared therefrom was more excellent.
The polycarboxylic acid water reducer in the comparative example 5 is selected from FS-2080 polycarboxylic acid water reducers provided by Shenzhen, same Zhoudada science and technology development Limited company; compared with example 4, under the condition of using the same amount of the gel reducing agent, the amount of the required cement is obviously increased, and the amount of the water reducing agent in the concrete formula is not obviously changed, which shows that the gel reducing effect of the gel reducing agent is affected after the common polycarboxylic acid water reducing agent is used.
TABLE 2 concrete Performance test Table for examples 1 to 8 and comparative examples 1 to 5
Slump and expansion are determination methods and indexes of concrete workability, and the larger the slump and expansion are, the better the fluidity of the concrete is; concrete bleeding refers to the phenomenon that the coarse aggregate sinks and the moisture floats upwards in the processes of transportation, vibration and pumping of concrete; the workability of the concrete can be standardized by slump, expansion and bleeding rate.
According to data in table 2, after the glue reducing agent of the embodiments 1-3 of the invention is added, slump of the concrete mixture can be obviously improved, bleeding rate and slump loss over time are reduced, the fluidity of concrete is improved, the uniformity of the concrete mixture is improved, the wrapping property of cement to aggregate is improved, and the workability of concrete is improved; and under the condition of reducing the cement consumption, the compressive strength of the concrete can be improved, and the performance of the concrete is improved.
After the gel reducer of the embodiment 4-8 of the invention is added, the slump of the concrete mixture can be obviously improved, the bleeding rate and the loss of the slump over time are reduced, the fluidity of the concrete is improved, the uniformity of the concrete mixture is improved, the wrapping property of cement to aggregate is improved, and the workability of the concrete is improved; and under the condition of reducing the using amount of cement and the using amount of a water reducing agent in concrete, the compressive strength of the concrete can be improved, and the performance of the concrete is improved.
In the comparative example 1, the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1: 1; the slump loss of the concrete with time was slightly reduced as compared with example 1, which indicates that the slump loss of the concrete with time is reduced when the weight ratio of triethanolamine, triisopropanolamine and diethanolamine in the gel reducer is 1:1.125: 1.
Comparative example 2 anhydrous sodium metasilicate and sodium methylsilicate were replaced with equal amounts of water; in comparative example 3, anhydrous sodium metasilicate and lithium silicate were replaced with the same amount of water; in comparative example 4, sodium methyl silicate and lithium silicate were replaced with equal amounts of water. In comparison with example 1, the amount of cement required was significantly increased by using the cement reducing agents of comparative examples 2 to 4 in the case of using the same amount of the cement reducing agent, which shows that when anhydrous sodium metasilicate, sodium methyl silicate and lithium silicate were used in combination, there was a synergistic effect, and the cement amount reducing effect of the cement reducing agent prepared therefrom was more excellent.
The polycarboxylic acid water reducer in the comparative example 5 is selected from FS-2080 polycarboxylic acid water reducers provided by Shenzhen, same Zhoudada science and technology development Limited company; the comparison of comparative example 5, example 4 and example 1 shows that the fluidity and compressive strength of concrete mixtures are not obviously improved after the common water reducing agent is added into the glue reducing agent, and the cement consumption can be obviously reduced and the consumption of the external water reducing agent for concrete can be reduced after the polycarboxylic acid water reducing agent prepared by the invention is added into the glue reducing agent, so that the workability of concrete can be improved and the compressive strength of concrete can be improved.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, 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 invention.
Claims (8)
1. A concrete gel reducing agent is characterized in that: the aqueous emulsion is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 45-55 parts of mixed alcohol amine, 4-6 parts of anhydrous sodium metasilicate, 5-7 parts of lithium silicate, 15-20 parts of sodium methyl silicate, 3-5 parts of polycarboxylic acid water reducing agent and the balance of water;
the polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of alpha-alkenyl sodium sulfonate, 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 40-60 parts of methallyl alcohol polyoxyethylene ether;
the mixed alcohol amine is formed by mixing triethanolamine, triisopropanolamine and diethanolamine according to the weight ratio of 1:1.125: 1.
2. The concrete gel reducing agent of claim 1, wherein: the aqueous emulsion is prepared by diluting mother liquor and water, and comprises the following components in 100 parts by weight of the mother liquor: 50 parts of mixed alcohol amine, 5 parts of anhydrous sodium metasilicate, 6 parts of lithium silicate, 18 parts of sodium methyl silicate, 3-5 parts of polycarboxylic acid water reducing agent and the balance of water.
3. The concrete gel reducing agent of claim 1, wherein: the polycarboxylic acid water reducing agent is prepared by the following method: taking 10-15 parts of acrylic acid, 3-5 parts of acrylamide, 1-2 parts of hydroxyethyl methacrylate, 0.2-0.4 part of isobutyl methacrylate, 2-3 parts of sodium methallyl sulfonate, 0.2-0.3 part of alpha-alkenyl sulfonate and 50-60 parts of water by weight parts, and uniformly stirring to obtain a mixed solution A;
uniformly stirring 0.1-0.2 part of chain transfer agent, 0.3-0.5 part of initiator and 10-15 parts of water to obtain a mixed solution B;
taking 40-60 parts of methallyl alcohol polyoxyethylene ether and 50-70 parts of water, heating to 45-50 ℃, adding the mixed solution B, stirring for 1-2h, adding the mixed solution A, dropwise adding for 3-4h, then adding 100 parts of water, stirring for 3-4h at the temperature of 45-50 ℃, and then adding alkali liquor to adjust the pH of the system to 6-8, thereby obtaining the polycarboxylic water reducer.
4. The concrete gel reducing agent of claim 3, wherein: the chain transfer agent is one of mercaptopropionic acid and mercaptoacetic acid.
5. The concrete gel reducing agent of claim 3, wherein: the initiator is formed by mixing ammonium persulfate and ascorbic acid in a weight ratio of 3: 1.
6. A method for preparing the concrete gel reducing agent according to any one of claims 1 to 5, wherein: the method comprises the following steps:
s1, adding anhydrous sodium metasilicate and sodium methylsilicate into a certain amount of water according to a proportion, and uniformly stirring to obtain a mixed solution;
s2, adding mixed alcohol amine, lithium silicate and a polycarboxylic acid water reducing agent into the mixed solution, and uniformly stirring to obtain mother liquor;
and S3, adding water into the mother liquor for dilution to obtain the concrete glue reducing agent.
7. The preparation method of the concrete gel reducing agent according to claim 6, wherein the preparation method comprises the following steps: the stirring speed in S2 is 200-600r/min, and the stirring time is 20-30 min.
8. The preparation method of the concrete gel reducing agent according to claim 6, wherein the preparation method comprises the following steps: the ratio of mother liquor to water in S3 was 1: 14.
Priority Applications (1)
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| CN113105149A (en) * | 2021-05-17 | 2021-07-13 | 成都砼星新材料有限公司 | Concrete glue reducing agent and preparation method and application method thereof |
| CN113480270B (en) * | 2021-08-16 | 2022-10-14 | 陕西丰盛德远实业有限公司 | Lightweight aggregate concrete and preparation method thereof |
| CN115368053B (en) * | 2021-10-22 | 2023-11-07 | 江苏兴砼弘业新材料有限公司 | Reinforced gel reducing auxiliary agent and preparation method thereof |
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