CN114315219A - Workability regulator for machine-made sand concrete - Google Patents
Workability regulator for machine-made sand concrete Download PDFInfo
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- CN114315219A CN114315219A CN202210044507.1A CN202210044507A CN114315219A CN 114315219 A CN114315219 A CN 114315219A CN 202210044507 A CN202210044507 A CN 202210044507A CN 114315219 A CN114315219 A CN 114315219A
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Abstract
The invention discloses a workability regulator for machine-made sand concrete, which is an aqueous solution of a solid-liquid composition, has a solid content of 20-60 percent, and has good stability and water reducer compatibility; the aqueous solution of the solid-liquid composition comprises the following raw material components in parts by weight: 5-20 parts of tackifier, 10-20 parts of air entraining agent, 3-5 parts of foam stabilizer, 5-10 parts of depolymerizing agent, 5-10 parts of slurry-rich agent, 10-30 parts of anti-mud agent and 10-50 parts of water. The invention adopts high molecular polymer as tackifier and compounds organic-inorganic composite depolymerizing agent such as glycerol polyol, sodium fluoride and the like. By the compound use of the tackifier and the depolymerizing agent, the problems of poor water retention, easy segregation and bleeding, easy hardening, high viscosity, poor fluidity, sensitive water consumption and the like of the machine-made sand concrete when the content of stone powder is low and the water-cement ratio is high are solved.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a workability regulator for machine-made sand concrete.
Background
Sandstone is the most basic and indispensable building material of concrete in engineering construction. For a long time, the sandstone mainly adopts natural river sand, is supplied nearby by regional markets, is generally in a supply and demand balanced state, and keeps the price basically stable. After years of large-scale exploitation, natural sandstone resources are gradually reduced, and with the enhancement of the supervision of environmental protection policies, natural river sand cannot meet the requirements of building markets, and machine-made sand is adopted in more and more areas. The machine-made sand is an ideal substitute for the river sand of the Tianhe, and the machine-made sand produced by adopting advanced process and equipment can completely replace the natural river sand to be used for producing concrete. However, due to the fact that the application process of the machine-made sand is too fast, recognition and supervision of the machine-made sand in part of regions are insufficient, and the quality levels of the produced machine-made sand are not uniform and the quality is very different due to cost, equipment and process factors. Mainly characterized in that the granules have no shaping process and poor granule shape; the powder selecting process is rough, and the content fluctuation of the stone powder is large; the source of the mother rock is unstable, the mother rock is not cleaned to remove impurities, and the mud powder content is high; the equipment and process are not standard, and the grading is poor. The quality problem of the machine-made sand causes that concrete mixed by the machine-made sand often has the problems of poor wrapping property, poor fluidity, large loss, easy segregation, bleeding and the like, and simultaneously has the problems of sensitivity to water consumption, large slump fluctuation, difficult control of fluidity and the like, thereby influencing the popularization and application of the machine-made sand and causing the engineering quality hidden danger. The workability problem of machine-made sand concrete adopts an adjusting method of compounding water reducing agent mother liquor, and needs to adopt functional water reducing agent mother liquor with high dispersibility and high water retention, the water reducing rate of the water reducing agent mother liquor is low, the cost is higher, the process is complex, a plurality of water reducing agent development technologies are needed during production, the production process and the mother liquor variety are frequently adjusted, and the large-scale industrial production is not facilitated; by adopting the method of adjusting and matching, the dosage of the cementing material is generally required to be increased, the material cost is increased, the economic benefit is influenced, the improvement effect of colleagues is limited, and a good effect cannot be achieved.
Patent CN 107828027A provides a workability regulator with water-reducing function, which comprises workability regulating macromolecules and water; the workability adjusting macromolecule is obtained through copolymerization reaction, and the comonomer comprises polymerization active end micro-hydrophobic modified polyether and a-alkenyl sodium sulfonate; the workability regulator with the water reducing function can effectively introduce tiny and stable bubbles, and has excellent saline-alkali resistance. On the premise of not influencing the strength of concrete, the invention can introduce a large amount of tiny, closed and stable bubbles into the concrete, and has certain slurry collecting capacity, thereby achieving the purpose of improving the workability of the concrete. But the method has strict requirements on synthesis environment, the production process is difficult to control, and the cost is high.
Patent CN201310749293.9 discloses a water reducing agent with concrete workability adjusting function and a synthesis method thereof. The water reducing agent has good water retention property, can reduce the surface tension of concrete without influencing the viscosity and the fluidity of the concrete, and can ensure the normal development of the setting time and the strength of the concrete. However, the two monomers of sodium methallyl sulfonate and sodium styrene sulfonate introduced in the patent are sensitive to salt and alkali, and the regulator has poor stability and unstable performance in concrete with high salt and alkali content.
The patent CN 110655346A provides a machine-made sand regulator and a preparation method thereof, the machine-made sand regulator contains a polycarboxylic acid water reducing agent, a glue reducing agent, an early strength agent, an air entraining agent, a polyether type defoaming agent, a compact repairing agent, a viscosity thixotropic agent and water, is suitable for machine-made sand with different grades, and can control the better working performance of concrete and ensure the durability requirement of the concrete. However, the patent uses talcum powder and molasses as viscosity thixotropic agents, has limited viscosity modification effect and can influence the setting time of concrete.
Patent CN112897933A utilizes synthetic hyperbranched ether to react with prenyl polyoxyethylene ether, acrylic acid, unsaturated phosphate monoester monomer, forms hyperbranched carboxylic acid water reducing agent, has utilized unsaturated phosphate monoester monomer to further modify carboxylic acid water reducing agent at this in-process, has prepared machine-made sand concrete regulator through compounding with the function small powder, improves the consistency, intensity, the cohesiveness of the cement of being prepared by machine-made sand to keep the long-term stability of cement slump. The patent mainly realizes the function of easy regulation through the water reducing agent branch functional group, and belongs to a functional water reducing agent.
The workability problem of the machine-made sand concrete relates to various contents such as water retention property, cohesiveness, wrapping property, bubble structure, stability and the like of the concrete, the problems are difficult to solve by only depending on the compounding of a water reducing agent and the design adjustment of the mixing proportion, and a multifunctional compound type special regulator for the workability adjustment of the machine-made sand concrete needs to be developed.
Disclosure of Invention
The invention provides a workability regulator for machine-made sand concrete, and aims to solve the technical problems of segregation, bleeding, poor wrapping property, sensitivity to water consumption, poor pumping performance and the like of the workability of machine-made sand concrete.
The technical scheme of the invention is as follows:
the workability regulator is an aqueous solution of a solid-liquid composition, has a solid content of 20-60 percent, and has good stability and water reducer compatibility; the aqueous solution of the solid-liquid composition comprises the following raw material components in parts by weight: 5-20 parts of tackifier, 10-20 parts of air entraining agent, 3-5 parts of foam stabilizer, 5-10 parts of depolymerizing agent, 5-10 parts of slurry-rich agent, 10-30 parts of anti-mud agent and 10-50 parts of water.
Preferably, the tackifier is one or a combination of more of polyvinyl alcohol, polyacrylamide, pregelatinized starch, methyl cellulose, carboxymethyl cellulose and cellulose ether;
the air entraining agent is one or a combination of a plurality of sodium dodecyl benzene sulfonate, polyether phosphate, fatty alcohol-polyoxyethylene ether, fatty alcohol-polyoxyethylene sodium sulfonate and fatty alcohol sodium sulfate;
the foam stabilizer is one or a combination of more of sodium stearate, fatty alcohol ether, oxidized paraffin soap, polyorganosiloxane and polyether modified silicon;
the depolymerizing agent is one or a combination of a plurality of polymeric phosphate, polyacrylate and organic phosphine chelating agents;
the slurry-rich agent is one or a combination of more of glycerin polyol, sodium fluoride, sodium fluosilicate, potassium silicate, sodium metasilicate, potassium carbonate and sodium thiocyanate;
the anti-mud agent is one or a combination of more of tetramethylammonium chloride, sodium sulfanilate, ethylene diamine tetraacetic acid and choline chloride compounds.
Further preferably, the polyacrylamide is 600-1200 ten thousand molecular weight anionic polyacrylamide, and the cellulose ether is hydroxypropyl methyl cellulose ether.
Further preferably, the air entraining agent is sodium alpha-alkenyl sulfonate.
Further preferably, the foam stabilizer is a mixture of fatty alcohol ether and polyether modified silicon with the mass ratio of 1-5: 1.
Further preferably, the polymeric phosphate comprises sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate, or sodium superphosphoric acid.
Further preferably, the polyacrylate comprises sodium polyacrylate, ammonium polyacrylate; the organic phosphine chelating agent comprises polyamine polyether methylene phosphoroamine (PAPEMP), Ethylene Diamine Tetra Methylene Phosphoric Acid (EDTMPA) and Hexamethylene Diamine Tetra Methylene Phosphoric Acid (HDTMPA).
Further preferably, the size-enriching agent is a mixture of glycerol polyol and sodium fluosilicate in a mass ratio of (1.5-2.5): 1.
Further preferably, the anti-mud agent is one or a combination of more of tetramethylammonium chloride, sodium sulfanilate, ethylene diamine tetraacetic acid and choline chloride compounds.
The workability regulator for machine-made sand concrete is an aqueous solution of a solid-liquid composition, and the solid content of the aqueous solution of the solid-liquid composition accounts for 20-60%; the mixing amount of the workability regulator in the machine-made sand concrete is 0.1-0.5% of the mass sum of the cementing materials, and the mass ratio of the workability regulator in the water reducing agent is 2-10% when the water reducing agent is used in a compounding way.
The invention has the following beneficial effects:
1. in the component design, the high molecular polymer is adopted as the tackifier, and the organic-inorganic composite depolymerizing agent such as glycerol polyol, sodium fluoride and the like is compounded. The viscosity of the cement paste is regulated by the tackifier, and the water retention of the concrete and the stability of a mortar-bone system are improved; the glycerol polyol in the depolymerizing agent is adsorbed on the surfaces of the agglomerated cement and stone powder particles and effectively dispersed, so that water wrapped in the depolymerized polyol is released, and the depolymerized fine cement particles can be filled among large cement particles, so that the using amount of water can be further reduced under the condition of not influencing the workability of concrete, the viscosity of the concrete is improved, and the concrete is prevented from hardening. By the compound use of the tackifier and the depolymerizing agent, the problems of poor water retention, easy segregation and bleeding, easy hardening, high viscosity, poor fluidity, sensitive water consumption and the like of the machine-made sand concrete when the content of stone powder is low and the water-cement ratio is high are solved.
2. The invention adopts the mode of combining the air entraining agent of alpha-alkenyl sodium sulfonate and fatty alcohol-polyoxyethylene ether with the fatty alcohol ether and the polyether modified silicon foam stabilizer, introduces a large amount of bubbles through the air entraining agent, increases the thickness of a bubble water film through the foam stabilizer, simultaneously eliminates a part of large and unstable bubbles, and retains a large amount of fine and stable bubbles in concrete through the mode of combining elimination, introduction and stabilization. The fine and stable bubbles increase the volume of the slurry, play a role in ball bearing, reduce the friction force between aggregates and improve the cohesiveness and the wrapping property of the concrete.
3. According to the invention, in the component design, the glycerin polyol is adopted to disperse the flocculation structure in the slurry, so that the dispersion degree of the slurry is improved, and the early-strength inorganic salt is adopted to catalyze the rapid hydration of cement minerals in the concrete slurry, so that on one hand, part of free water is consumed, the viscosity of the slurry is increased, on the other hand, a gel product is formed after hydration, the volume and the specific surface area are obviously increased, the total amount of the slurry is improved, and the improvement of the wrapping property of the concrete is facilitated.
4. Aiming at the problem of unstable stone powder and mud content in the machine-made sand, the invention adopts the anti-mud agent of quaternary ammonium salt or choline chloride in the component design, inhibits the adsorption of machine-made sand mud powder on the water reducing agent, and effectively reduces the influence of the mud content fluctuation of machine-made sand concrete on the workability of the concrete.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The workability regulator for machine-made sand concrete comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. Wherein the tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 5%.
Example 2
The embodiment provides a workability regulator for machine-made sand concrete, which comprises the following components in percentage by mass:
15 parts of tackifier, 20 parts of air entraining agent, 3 parts of foam stabilizer, 10 parts of depolymerizing agent, 5 parts of slurry-rich agent, 20 parts of anti-mud agent and 27 parts of water. Wherein the carboxymethyl cellulose, the air entraining agent is a commercially available fatty alcohol-polyoxyethylene ether air entraining agent, the foam stabilizer is a mixture of 5-1 of sodium stearate and polyether modified silicon, the depolymerizing agent is sodium hexametaphosphate, the slurry-rich agent is a mixture of glycerol polyol and sodium fluosilicate in a mass ratio of 1:1, and the anti-mud agent is ethylenediamine tetraacetic acid.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 3%.
Example 3
The embodiment provides a workability regulator for machine-made sand concrete, which comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 10 parts of depolymerizing agent, 10 parts of slurry-rich agent, 20 parts of anti-mud agent and 35 parts of water. Wherein the tackifier is a mixture of 1000 ten thousand molecular weight anionic polyacrylamide and hydroxypropyl methyl cellulose ether in a mass ratio of 2:1, the air entraining agent is a commercially available fatty alcohol polyoxyethylene ether air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyamine-based polyether methylene phosphoroamine, the slurry-rich agent is a mixture of glycerol polyol and sodium fluosilicate in a mass ratio of 2:1, and the anti-mud agent is choline chloride.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 3%.
Example 4
The embodiment provides a workability regulator for machine-made sand concrete, which comprises the following components in percentage by mass:
12 parts of tackifier, 15 parts of air entraining agent, 4 parts of foam stabilizer, 8 parts of depolymerizing agent, 8 parts of slurry-rich agent, 25 parts of anti-mud agent and 28 parts of water. Wherein the tackifier is pregelatinized starch, the air entraining agent is sodium dodecyl benzene sulfonate, and the foam stabilizer is 5:1, the depolymerizing agent is sodium pyrophosphate, the slurry-rich agent is sodium metasilicate, and the anti-mud agent is sodium sulfanilate.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 8%.
Application example:
the workability regulator prepared in the embodiments 1-4 of the invention is applied to machine-made sand concrete, and the comparative example adopts commercially available common polyacrylamide (comparative example 1), and the mixing amount is 0.2 percent of the mass ratio of the water reducing agent; modified cellulose (comparative example 2), the mixing amount is 0.2% of the mass ratio of the water reducing agent; the workability regulator is sold in the market (comparative example 3), and the mixing amount is 5 percent of the mass ratio of the water reducing agent; a blank control group (comparative example 4) of a singly-doped water reducing agent. The prepared concrete is respectively subjected to working performance and mechanical performance tests, and the test method refers to GB/T50080-2016 Standard test method for common concrete mixture Performance and GB/T50081-2019 Standard test method for common concrete mechanical Performance. The slump and the expansion degree are adopted to evaluate the fluidity of the concrete, the bleeding rate is adopted to represent the water retention of the concrete, the slump emptying method and the expansion time T500 are adopted to evaluate the viscosity of the concrete, and the gas content in 1 hour are adopted to evaluate the bubble stability of the concrete.
The cement used for detection is Portland dam Sanxia brand P.O42.5 cement; the mineral powder is Wuxin brand S95 mineral powder with a specific surface area of 560m2Kg, activity index 98%; the fly ash is first-grade fly ash produced by Huaneng Yingcheng thermoelectricity, and the water demand ratio is 95 percent; the stones are granite broken stones with 5-25mm continuous gradation; the water reducing agent is a CP-J polycarboxylic acid high-performance water reducing agent produced by Midsura Wuhan estuary new material limited company; the sand is 3 different types of machine-made sand, and the performance indexes are shown in table 1:
TABLE 1
| Species of | Modulus of fineness | Content of stone powder | MB value | Water demand ratio | Mother rocksModel (III) |
| Machine-made sand 1 | 2.8 | 8％ | 1.2 | 118 | Limestone |
| Machine-made sand 2 | 3.5 | 16％ | 1.7 | 139 | Limestone |
| Machine-made sand 3 | 3.2 | 10％ | 2.5 | 128 | Granite |
The concrete strength rating is C30, matching table 2:
TABLE 2
| Cement | Fly ash | Mineral powder | Machine-made sand | Crushing stone | Water reducing agent | Water (W) |
| 247 | 76 | 57 | 876 | 950 | 7.6 | 167 |
The experimental test data for comparative examples 1-3, examples 1-4 are given in table 3 below:
TABLE 3
The invention has good compounding effect with the polycarboxylic acid water reducing agent, can improve the fluidity, especially the expansion degree, of concrete, reduce the bleeding rate of the concrete, improve the water retention property and the bubble stability of the concrete, improve the viscosity of the concrete and improve the workability of the concrete. In the concrete prepared by the high-stone-powder-content machine-made sand 2, the fluidity is obviously improved, the collapse time and the T500 time are shortened, the concrete construction performance is greatly improved, and the workability of the high-stone-powder-content machine-made sand concrete is better improved.
To further illustrate the technical solution of the present invention, the following embodiment 1 is further described
Comparative example 4
A workability regulator for machine-made sand concrete is based on example 1, and is different from a tackifier in that the workability regulator does not comprise the following components in percentage by mass:
10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. The air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
Comparative example 5
A workability regulator for machine-made sand concrete is based on example 1, and is different from a depolymerizing agent, and comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
Example 5
The workability regulator for machine-made sand concrete is based on example 1, and is different in the ratio of the tackifier to the depolymerizing agent, and comprises the following components in percentage by mass:
5 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 10 parts of depolymerizing agent, 5 parts of slurry-rich agent, 15 parts of anti-mud agent and 50 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
The performance of the concrete is detected by adopting the machine-made sand 2 with higher stone powder content, the concrete workability regulator is 5 percent of the mass of the water reducing agent, and the test results are shown in the following table 4:
TABLE 4
The experimental data show that the depolymerizing agent can improve the slump retaining performance of concrete, improve the flow rate of the concrete, improve the hardening problem of the concrete, and the slurry-rich agent is beneficial to improving the wrapping performance of the concrete and has a certain effect on improving the slump loss. The deagglomerating agent breaks the agglomeration of cement and stone powder particles, so that free water wrapped in the deagglomeration agent is released, and fine cement particles can be filled among large cement particles, so that the consumption of water can be further reduced under the condition of not influencing the workability of concrete, the viscosity of the concrete is improved, and the concrete is prevented from hardening.
The tackifier can improve the problem of poor bleeding or wrapping property of concrete, adjust the viscosity of cement paste, and increase the water retention property of the concrete and the stability of a mortar system.
Through the compound use of the tackifier and the depolymerizing agent, the viscosity and the wrapping property of concrete are improved, and the problems of poor water retention property, easy bleeding, high viscosity, easy hardening and the like of machine-made sand concrete are solved.
Comparative example 6
The workability regulator for machine-made sand concrete is based on example 1, and is different from the workability regulator in that the workability regulator does not contain an air entraining agent and comprises the following components in percentage by mass:
10 parts of tackifier, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
Comparative example 7
The workability regulator for machine-made sand concrete is based on example 1, and is different from the workability regulator in that the workability regulator does not comprise a foam stabilizer and comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the mud-resistant agent is tetramethylammonium chloride.
Example 6
The workability regulator for machine-made sand concrete is based on example 1, and is different in the components of air entraining agents and comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 15 parts of anti-mud agent and 45 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is sodium dodecyl benzene sulfonate, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is tetramethylammonium chloride.
The performance of the concrete is detected by adopting the machine-made sand 1 with lower stone powder content, the concrete workability regulator is 5 percent of the mass of the water reducing agent, and the test results are shown in the following table 5:
TABLE 5
The concrete grouting material has the advantages that experimental data can be obtained, a mode of combining the air entraining agent and the foam stabilizer is adopted, a large number of bubbles are introduced through the air entraining agent, the size of the grout is increased, the wrapping performance of concrete is obviously improved, the workability is effectively improved, meanwhile, the bubbles play a ball effect, the friction force between aggregates is reduced, the viscosity of the concrete grout is improved, and the collapse emptying time and the T500 time are obviously shortened. The thickness of the bubble water film is increased through the foam stabilizer, meanwhile, part of large and unstable bubbles are eliminated, a large number of fine and stable bubbles are reserved in the concrete, the air retention of the concrete is obviously improved, and the workability for 1 hour is improved.
Comparative example 7
The workability regulator for machine-made sand concrete is based on example 1, and is different from the workability regulator in that the workability regulator does not contain a slurry-rich agent and comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 15 parts of anti-mud agent and 45 parts of water. The tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is ammonium polyacrylate, the anti-mud agent is tetramethylammonium chloride, and the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1: 1.
The performance of the concrete is detected by adopting the machine-made sand 1 with lower stone powder content, the concrete workability regulator is 5 percent of the mass of the water reducing agent, and the test results are shown in the following table 6:
TABLE 6
The experimental data show that with the increase of the proportion of the slurry-rich agent, the air content of the concrete is increased, the collapse-collapse time and the T500 time are shortened, and the workability, especially the wrapping performance of the concrete is improved, mainly because small molecular substances in the slurry-rich agent can improve the dispersion degree of the slurry, and simultaneously, inorganic salt catalyzes cement minerals in the concrete slurry to be quickly hydrated to form a gelatinous product after hydration, so that the volume and the specific surface area are obviously increased, the total amount of the slurry is improved, the wrapping performance of the concrete is favorably improved, and the problems of stone leakage and stone accumulation are solved.
Comparative example 8
The workability regulator for machine-made sand concrete is based on example 1, and is different from the workability regulator in that the workability regulator does not contain an anti-mud agent and comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent and 45 parts of water. Wherein the tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, and the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1: 1.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 5%.
Example 7
Based on the example 1, the difference is that the anti-mud agent is choline chloride and has different proportions, and the anti-mud agent comprises the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 10 parts of anti-mud agent and 45 parts of water. Wherein the tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is choline chloride.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 5%.
Example 8
Based on the example 1, the different anti-mud agents are ethylene diamine tetraacetic acid and have different proportions, and comprise the following components in percentage by mass:
10 parts of tackifier, 10 parts of air entraining agent, 5 parts of foam stabilizer, 5 parts of depolymerizing agent, 10 parts of slurry-rich agent, 5 parts of anti-mud agent and 45 parts of water. Wherein the tackifier is anionic polyacrylamide with the molecular weight of 800 ten thousand; the air entraining agent is a commercially available alpha-sodium alkenyl sulfonate air entraining agent, and the foam stabilizer is 2:1, the depolymerizing agent is polyacrylic acid ammonium salt, the slurry-rich agent is a mixture of glycerol polyol and sodium fluoride in a mass ratio of 1:1, and the anti-mud agent is ethylenediamine tetraacetic acid.
And mixing the materials according to the proportion to prepare the workability regulator of the machine-made sand concrete, wherein the mass ratio of the regulator in the water reducing agent is 5%.
The concrete mixed by the machine-made sand 3 with a higher MB value is adopted for performance detection, and the test results are as follows:
TABLE 7
According to experimental data, for machine-made sand concrete with a high MB value, the anti-mud agent can increase the slump expansion degree of the concrete and obviously reduce 1-hour slump and expansion loss. The anti-mud agent effectively solves the problem of influence of high mud powder content machine-made sand on the workability and the fluidity of concrete by inhibiting the adsorption of machine-made sand mud powder on a water reducing agent.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons skilled in the art without any inventive step based on the above-mentioned embodiments of the present invention shall fall under the protection of the present invention.
Claims (10)
1. A workability modifier for machine-made sand concrete, characterized in that: the workability regulator is an aqueous solution of a solid-liquid composition, has a solid content of 20-60%, and has good stability and water reducer compatibility; the aqueous solution of the solid-liquid composition comprises the following raw material components in parts by weight: 5-20 parts of tackifier, 10-20 parts of air entraining agent, 3-5 parts of foam stabilizer, 5-10 parts of depolymerizing agent, 5-10 parts of slurry-rich agent, 10-30 parts of anti-mud agent and 10-50 parts of water.
2. The workability regulator for machine-made sand concrete according to claim 1, characterized in that: the tackifier is one or a combination of more of polyvinyl alcohol, polyacrylamide, pregelatinized starch, methyl cellulose, carboxymethyl cellulose and cellulose ether;
the air entraining agent is one or a combination of a plurality of sodium dodecyl benzene sulfonate, polyether phosphate, fatty alcohol-polyoxyethylene ether, fatty alcohol-polyoxyethylene sodium sulfonate and fatty alcohol sodium sulfate;
the foam stabilizer is one or a combination of more of sodium stearate, fatty alcohol ether, oxidized paraffin soap, polyorganosiloxane and polyether modified silicon;
the depolymerizing agent is one or a combination of a plurality of polymeric phosphate, polyacrylate and organic phosphine chelating agents;
the slurry-rich agent is one or a combination of more of glycerin polyol, sodium fluoride, sodium fluosilicate, potassium silicate, sodium metasilicate, potassium carbonate and sodium thiocyanate;
the anti-mud agent is one or a combination of more of tetramethylammonium chloride, sodium sulfanilate, ethylene diamine tetraacetic acid and choline chloride compounds.
3. The workability regulator for machine-made sand concrete according to claim 2, characterized in that: the polyacrylamide is 600-1200 ten thousand molecular weight anionic polyacrylamide, and the cellulose ether is hydroxypropyl methyl cellulose ether.
4. The workability regulator for machine-made sand concrete according to claim 2, characterized in that: the air entraining agent is alpha-sodium alkenyl sulfonate.
5. The workability regulator for machine-made sand concrete according to claim 2, characterized in that: the foam stabilizer is a mixture of fatty alcohol ether and polyether modified silicon with the mass ratio of 1-5: 1.
6. The workability regulator for machine-made sand concrete according to claim 2, characterized in that: the polymerized phosphate comprises sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, sodium polyphosphate or sodium superphosphate.
7. The workability regulator for machine-made sand concrete according to claim 2, characterized in that: the polyacrylate comprises sodium polyacrylate and ammonium polyacrylate; the organic phosphine chelating agent comprises polyamine polyether methylene phosphoroamine (PAPEMP), Ethylene Diamine Tetra Methylene Phosphoric Acid (EDTMPA) and Hexamethylene Diamine Tetra Methylene Phosphoric Acid (HDTMPA).
8. The workability regulator for machine-made sand concrete according to claim 1, characterized in that: the slurry-rich agent is a mixture of glycerol polyol and sodium fluosilicate with the mass ratio of 1.5-2.5: 1.
9. The workability regulator for machine-made sand concrete according to claim 1, characterized in that: the anti-mud agent is one or a combination of more of tetramethylammonium chloride, sodium sulfanilate, ethylene diamine tetraacetic acid and choline chloride compounds.
10. The workability modifier for machine-made sand concrete of any one of claims 1 to 9, characterized in that: the workability regulator is an aqueous solution of a solid-liquid composition, and the solid content of the aqueous solution of the solid-liquid composition accounts for 20-60%; the mixing amount of the workability regulator in the machine-made sand concrete is 0.1-0.5% of the mass sum of the cementing materials, and the mass ratio of the workability regulator in the water reducing agent is 2-10% when the water reducing agent is used in a compounding way.
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| CN114988753A (en) * | 2022-04-28 | 2022-09-02 | 广东建盛高新材料有限公司 | Machine-made sand regulator and preparation method thereof |
| CN115925311A (en) * | 2022-12-20 | 2023-04-07 | 沈阳泰丰特种混凝土有限公司 | Regulator for improving workability of iron tailing sand concrete and concrete preparation method |
| CN116535121A (en) * | 2023-03-30 | 2023-08-04 | 浙江交工金筑交通建设有限公司 | Ore production improver for dry method sand |
| CN117383862A (en) * | 2023-10-13 | 2024-01-12 | 长沙千巽新材料科技有限公司 | Air entraining agent regulator and preparation method and application thereof |
| CN115925311B (en) * | 2022-12-20 | 2024-05-24 | 沈阳泰丰特种混凝土有限公司 | Modifier for improving workability of iron tailing sand concrete and concrete preparation method |
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| CN114315219B (en) | 2023-02-07 |
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