CN111153627A - Anti-mud additive suitable for machine-made sand concrete and compounding method thereof - Google Patents
Anti-mud additive suitable for machine-made sand concrete and compounding method thereof Download PDFInfo
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- CN111153627A CN111153627A CN202010005391.1A CN202010005391A CN111153627A CN 111153627 A CN111153627 A CN 111153627A CN 202010005391 A CN202010005391 A CN 202010005391A CN 111153627 A CN111153627 A CN 111153627A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
- C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a mud-resistant additive suitable for machine-made sand concrete and a compounding method thereof, wherein the mud-resistant additive comprises the following components in parts by weight: 30-50 parts of lignosulfonate water reducing agent, 20-35 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2-0.25 part of defoaming agent and 20-45 parts of water. The compounding method specifically comprises the step of mixing and compounding the anti-mud additive and the machine-made sand concrete, and the performance of the machine-made sand concrete can be changed by changing the adding sequence of the lignosulfonate water reducing agent. Compared with the prior art, the invention can be used for improving the mud resistance of the machine-made sand concrete and obviously improving the cohesiveness and compressive strength of the machine-made sand concrete.
Description
Technical Field
The invention relates to the field of building material concrete, in particular to a mud-resistant additive suitable for machine-made sand concrete and a compounding method thereof.
Background
The cement concrete material is one of the most widely used and most used building materials in the civil engineering field at present, and plays a role which cannot be replaced by other materials. Although natural sand is used as traditional concrete fine aggregate for a long time, as the natural sand is an irrenewable energy source, the storage capacity of the existing natural sand cannot meet the requirement of producing concrete raw materials along with the continuous reduction of natural sand resources, and the requirement of replacing the natural sand by machine-made sand is effectively solved. The replacement of natural sand by proper amount of machine-made sand is the leading direction of governments and industries at present, and is a necessary requirement for the sustainable development road. However, the high mud content of sand in concrete has become an urgent problem to be solved, a certain content of mud still exists in machine-made sand concrete, and compared with naphthalene water reducers, melamine water reducers, sulfamic acid water reducers and the like, the polycarboxylic acid water reducers are more sensitive to the mud content in concrete and show that the mixing amount is increased, the concrete slump-retaining effect is poor, the strength is reduced and the like, so that the development of an efficient mud-resistant additive becomes an important task for the future long-term development of the concrete industry in China.
The patent CN104556770B adopts an additive prepared by synthesizing a polycarboxylic acid water reducing agent, dipropylamine and sodium hexametaphosphate, and although the working performance and the mechanical property of the machine-made sand concrete with higher content of mud powder and stone powder can be improved, the raw material cost is too high in the process of preparing the machine-made sand concrete by widely popularizing machine-made sand instead of natural sand, and the dipropylamine and the sodium hexametaphosphate are toxic and harmful to human bodies.
Patent CN108409193A discloses a method for preparing a polycarboxylic acid admixture for machine-made sand C120 ultra-high-strength concrete, which comprises the following components in percentage by weight: 30-50% of water-reducing polycarboxylic acid water reducing agent, 22.5-35% of viscosity-reducing polycarboxylic acid water reducing agent, 1.5-5% of retarder, 0.1-0.25% of defoaming agent and 10-45% of water. The patent reports that a polycarboxylate water reducer is used as a basic raw material, and a small amount of retarder and defoamer are added, but the admixture is only applied to machine-made sand C120 ultrahigh-strength concrete. Therefore, there is a need to develop an admixture which has simple preparation process, low cost and environmental friendliness and can significantly improve the working performance and mechanical property of ordinary machine-made sand concrete.
Disclosure of Invention
The invention aims to solve the problems and provide a mud-resistant additive suitable for machine-made sand concrete and a compounding method thereof.
The purpose of the invention is realized by the following technical scheme:
the mud-resistant admixture suitable for machine-made sand concrete comprises the following components in parts by weight:
wherein, the viscosity reduction type polycarboxylate superplasticizer can be marked as PC.
Preferably, the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, and the water reducing rate is 8-14%.
Preferably, the solid content of the viscosity-reducing polycarboxylate superplasticizer is 40-50%, and the water reduction rate is more than or equal to 28%.
Preferably, the defoamer is a silicone defoamer; the water is deionized water.
Preferably, the viscosity-reducing polycarboxylate water reducer is prepared by the following method: preparing a polyether macromonomer aqueous solution, adding the polyether macromonomer aqueous solution into a reaction kettle, heating, then adding an initiator, uniformly stirring, then simultaneously dropwise adding the solution A and the solution B into the reaction kettle, continuously stirring while dropwise adding, preserving heat after dropwise adding is finished, then adding an alkaline substance, and controlling the pH value to be between 7 and 9 to obtain the viscosity-reduction type polycarboxylate superplasticizer;
the solution A is an aqueous solution formed by mixing methacrylic acid and methacrylic acid vinegar, and the solution B is an aqueous solution formed by mixing vitamin C and one of mercaptoethanol, mercaptopropanol or sodium methallyl sulfonate.
Preferably, the heating temperature is 40-60 ℃, the dropping time of the solution A and the dropping time of the solution B are both 4-8h, and the heat preservation time is 1.5-2.5 h.
Preferably, the polyether macromonomer in the polyether macromonomer aqueous solution is methacrylic acid-polyethylene glycol methyl ether ester, the initiator is ammonium persulfate aqueous solution or potassium persulfate aqueous solution, and the alkaline substance is sodium hydroxide aqueous solution. Wherein the mass concentration of the ammonium persulfate in the ammonium persulfate aqueous solution is 42 percent, the mass concentration of the potassium persulfate in the potassium persulfate aqueous solution is 42 percent, and the mass concentration of the sodium hydroxide in the sodium hydroxide aqueous solution is 31 percent. The initiator decomposes at higher temperatures to provide free radicals, which induce the polyether macromonomer to change to an active state.
Preferably, when the B solution is an aqueous solution formed by mixing vitamin C and mercaptoethanol, the mass ratio of the vitamin C to the mercaptoethanol is 1 (2-4);
when the solution B is an aqueous solution formed by mixing vitamin C and lyophobic propanol, the mass ratio of the vitamin C to the lyophobic propanol is 1 (3.5-5.5);
when the solution B is an aqueous solution formed by mixing vitamin C and sodium methallyl sulfonate, the mass ratio of the vitamin C to the sodium methallyl sulfonate is 1 (6.5-8.5);
the mass ratio of the methacrylic acid to the methacrylic acid vinegar is 1 (2-3), and the mass ratio of the vitamin C, the ammonium persulfate aqueous solution, the sodium hydroxide aqueous solution, the methacrylic acid to the methacrylic acid-polyethylene glycol methyl ether ester is 1 (1.5-2.5): 14-16): 35-40): 250-350. Further preferably, the mass ratio of the vitamin C, the aqueous solution of ammonium persulfate, the aqueous solution of sodium hydroxide, the methacrylic acid and the methacrylic acid-polyethylene glycol methyl ether ester is 1:2:15:37: 300.
A mud-resistant admixture suitable for machine-made sand concrete and a compounding method of the machine-made sand concrete are disclosed, wherein the compounding method specifically comprises the following steps: weighing the components of the anti-mud additive according to the proportion, stirring the components at 40-60 ℃ for 5-7h, then preserving heat for 1.5-2.5h to obtain the anti-mud additive suitable for machine-made sand concrete, and then adding the machine-made sand concrete for compounding, wherein the weight part of the anti-mud additive is 0.5-1.8% of the weight part of a cementing material contained in the machine-made sand concrete.
A mud-resistant admixture suitable for machine-made sand concrete and a compounding method of the machine-made sand concrete are disclosed, wherein the compounding method specifically comprises the following steps: weighing the components of the anti-mud additive according to the proportion, firstly adding a lignosulfonate water reducing agent into machine-made sand concrete, then adding a viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and water, stirring for 3-5h at 40-60 ℃, then preserving heat for 1-2h, and then continuously adding the machine-made sand concrete for compounding, wherein the weight part of the anti-mud additive is 0.3-0.9% of the total weight part of the cementing materials contained in the machine-made sand concrete added twice.
According to the invention, the anti-mud additive suitable for the machine-made sand concrete can be prepared by compounding the sodium lignosulfonate water reducing agent, the viscosity-reducing polycarboxylic acid water reducing agent, the organic silicon defoamer and the deionized water, and the problems of large viscosity, poor fluidity, serious loss over time, unstable strength and the like of the machine-made sand concrete are solved.
The viscosity reduction type polycarboxylate superplasticizer is a high-performance water reducer, and water reducer molecules with negative electricity side groups are adsorbed on the surfaces of cement particles to generate an electrostatic repulsion effect, so that a flocculation structure of the cement particles is disintegrated, and meanwhile, the viscosity reduction type polycarboxylate superplasticizer has excellent steric hindrance effect and ball effect. In the molecular structure design, the effective components in the solution A and the solution B provide unsaturated small monomers which form free aggregation and reaction with polyether large monomers, so that the defects of high viscosity, poor fluidity, serious loss over time, unstable strength and the like of machine-made sand concrete can be effectively improved. The viscosity-reducing polycarboxylate water reducer prepared by the invention has the characteristics of high fluidity, low viscosity and the like under the condition that the compressive strength of concrete reaches the standard, and has more comprehensive performance compared with the traditional polycarboxylic acid water reducer sold on the market, so that the viscosity-reducing polycarboxylate water reducer can be used for materials with poor fluidity such as machine-made sand concrete, recycled aggregate concrete and the like on a large scale.
In addition, the defoaming agent is an organic silicon defoaming agent, and has the characteristics of small surface tension, strong defoaming force, low cost, better thermal stability, capability of being used in a wide temperature range of 5-150 ℃, better chemical stability, capability of being used in acid, alkali and salt solutions, and no damage to the product quality.
The lignosulfonate water reducing agent selected by the invention is specifically a sodium lignosulfonate water reducing agent, mainly solves the loss caused by the large adsorption of mud powder and stone powder with high specific surface area in concrete on the water reducing agent, and has similar effects when other lignosulfonate water reducing agents such as calcium lignosulfonate and magnesium lignosulfonate water reducing agents are selected.
Under the condition of high mud content of aggregate, a single polycarboxylate water reducer is partially adsorbed by mud powder and stone powder with higher content of machine-made sand, so that the mud resistance effect is not obvious, and the problems of poor concrete flowing effect, high loss and the like cannot be effectively solved by simply increasing the mixing amount of the polycarboxylate water reducer, so that the invention selects the sodium lignosulfonate water reducer with stable performance and low price, and when the mud resistance additive and the machine-made sand concrete are compounded, two compounding modes of sequentially adding sodium lignosulfonate are simultaneously tried to prepare the mud resistance additive, wherein the sodium lignosulfonate water reducer and the machine-made sand concrete are mixed, a large amount of sodium lignosulfonate is adsorbed on the surfaces of the mud powder and stone powder particles, so that the pre-adsorption is firstly generated in the process of mixing the machine-made sand concrete, the workability of the machine-made sand concrete is effectively improved, and the problems of the prior art that the machine-made sand polyhedral, The problems of high water demand rate and easy segregation of prepared concrete caused by rough surface appearance and high content of bottom powder are solved, and the problems of high-efficiency water reducing agents such as agglomeration carboxylic acid water reducing agents and the like caused by large content of machine-made sand mud powder and stone powder and large specific surface area of machine-made sand concrete are solved.
Compared with the prior art, the invention has the following beneficial effects:
1. the mud-resistant additive effectively overcomes the inherent defects of high mud stone powder content and rough surface appearance of machine-made sand, and solves the problems of poor workability, large time loss, unstable strength and the like in the prior art of preparing concrete by using machine-made sand.
2. The invention provides two methods for compounding a mud-resistant additive and machine-made sand concrete, wherein a sodium lignosulfonate water reducing agent is firstly pre-adsorbed with the machine-made sand concrete, and then a viscosity-reducing polycarboxylic acid water reducing agent is added, so that the improvement effect of the additive on the performance of the machine-made sand concrete can be further ensured, and the cost is greatly reduced.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The viscosity-reducing polycarboxylic acid water reducing agent is prepared by the following method: preparing an aqueous solution of methacrylic acid-polyethylene glycol methyl ether ester, adding the aqueous solution into a reaction kettle, heating the solution, adding an ammonium persulfate aqueous solution with the mass concentration of 42 percent as an initiator to perform stirring reaction when the temperature is between 40 and 60 ℃, simultaneously dropwise adding the solution A and the solution B into the reaction kettle after uniform stirring, continuously stirring the solution A and the solution B while dropwise adding, preserving the temperature for 1.5 to 2.5 hours after the dropwise adding is finished, adding a sodium hydroxide aqueous solution with the mass concentration of 31 percent, controlling the pH value between 7 and 9 to obtain the viscosity-reducing polycarboxylic acid water reducer, wherein the solid content of the viscosity-reducing polycarboxylic acid water reducer is 40 to 50 percent, the water reducing rate is more than or equal to 28 percent, the solution A is an aqueous solution formed by mixing methacrylic acid and methacrylic acid vinegar, the mass ratio of the methacrylic acid to the methacrylic acid vinegar is 1:2, the solution B is an aqueous solution formed by mixing vitamin C and mercaptoethanol, the mass ratio of the vitamin C to the mercaptoethanol is 1 (2-4), the mass ratio of the vitamin C, the ammonium persulfate aqueous solution, the sodium hydroxide aqueous solution, the methacrylic acid to the methacrylic acid-polyethylene glycol methyl ether ester is 1:2:15:37:300, and the mass ratio of the sum of the mass of the methacrylic acid and the methacrylic acid acetate to the mass of the polyether macromonomer (namely the methacrylic acid-polyethylene glycol methyl ether ester) is 1 (10-3).
The mud-resistant additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a self-made viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 40 parts of sodium lignosulfonate water reducing agent, 34.75 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.25 part of organic silicon defoaming agent and 25 parts of deionized water. Stirring the components of the anti-mud additive for 5 hours at 40 ℃, then preserving heat for 1.5 hours, and uniformly mixing and adding the components into conventional machine-made sand concrete, wherein the weight part of the anti-mud additive is 0.9 percent of the weight part of a cementing material contained in the machine-made sand concrete. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
Example 2
The anti-mud additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a viscosity-reducing polycarboxylic acid water reducing agent prepared in the embodiment 1, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 45 parts of sodium lignosulfonate water reducing agent, 34.8 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2 part of organic silicon defoaming agent and 20 parts of deionized water. The components of the anti-mud additive are stirred for 7 hours at the temperature of 60 ℃, and then are uniformly mixed and added into machine-made sand concrete after heat preservation for 2.5 hours, wherein the weight of the anti-mud additive is 0.9 percent of the weight of cementing materials contained in the machine-made sand concrete. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
Example 3
The anti-mud additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a viscosity-reducing polycarboxylic acid water reducing agent prepared in the embodiment 1, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 50 parts of sodium lignosulfonate water reducing agent, 20 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2 part of organic silicon defoaming agent and 29.8 parts of deionized water. The components of the anti-mud additive are stirred for 6 hours at 50 ℃, and then are uniformly mixed and added into machine-made sand concrete after heat preservation for 2 hours, wherein the weight of the anti-mud additive is 1.8 percent of the weight of cementing materials contained in the machine-made sand concrete. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
Example 4
The anti-mud additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a viscosity-reducing polycarboxylic acid water reducing agent prepared in the embodiment 1, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 40 parts of sodium lignosulfonate water reducing agent, 34.75 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.25 part of organic silicon defoaming agent and 25 parts of deionized water. The method comprises the steps of firstly doping a sodium lignosulfonate water reducing agent into machine-made sand concrete for pre-adsorption, then adding a viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and deionized water, stirring for 5 hours at 60 ℃, then preserving heat for 2 hours, and then continuously adding the machine-made sand concrete for compounding, wherein the weight of the anti-mud additive is 0.35% of the total weight of the cementing materials contained in the machine-made sand concrete added twice. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
Example 5
The anti-mud additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a viscosity-reducing polycarboxylic acid water reducing agent prepared in the embodiment 1, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 45 parts of sodium lignosulfonate water reducing agent, 34.8 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2 part of organic silicon defoaming agent and 20 parts of deionized water. The method comprises the steps of firstly doping a sodium lignosulfonate water reducing agent into machine-made sand concrete for pre-adsorption, then adding a viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and deionized water, stirring for 4 hours at 50 ℃, then preserving heat for 1.5 hours, and then continuously adding the machine-made sand concrete for compounding, wherein the weight part of the anti-mud additive is 0.34% of the total weight part of the cementing materials contained in the machine-made sand concrete added twice. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
Example 6
The anti-mud additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a viscosity-reducing polycarboxylic acid water reducing agent prepared in the embodiment 1, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a sodium lignosulfonate water reducing agent, the solid content of the sodium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 34.8 parts of sodium lignosulfonate water reducing agent, 20 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2 part of organic silicon defoaming agent and 45 parts of deionized water. The method comprises the steps of firstly doping a sodium lignosulfonate water reducing agent into machine-made sand concrete for pre-adsorption, then adding a viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and deionized water, stirring for 3 hours at 40 ℃, then preserving heat for 1 hour, and then continuously adding the machine-made sand concrete for compounding, wherein the weight part of the anti-mud additive is 0.9% of the total weight part of the cementing materials contained in the machine-made sand concrete added twice. The slump (including initial slump and slump with time (1h)) and the strength (7d bending resistance, 7d compression resistance, 28d bending resistance and 28d compression resistance) of the finally obtained machine-made sand concrete are shown in Table 1.
TABLE 1 slump and Strength List of the final machine-made Sand concretes obtained in examples 1-6
Example 7
The viscosity-reducing polycarboxylic acid water reducing agent is prepared by the following method: preparing an aqueous solution of methacrylic acid-polyethylene glycol methyl ether ester, adding the aqueous solution into a reaction kettle, heating the aqueous solution, adding a potassium persulfate aqueous solution with the mass concentration of 42 percent as an initiator to perform stirring reaction when the aqueous solution is heated to 40-60 ℃, simultaneously dropwise adding a solution A and a solution B into the reaction kettle after the stirring is uniform, continuously stirring the solution A and the solution B while dropwise adding, preserving the temperature for 1.5-2.5h after the dropwise adding is finished, adding a magnesium hydroxide aqueous solution with the mass concentration of 31 percent, controlling the pH value between 7 and 9 to obtain the viscosity-reducing polycarboxylic acid water reducer, wherein the solid content of the viscosity-reducing polycarboxylic acid water reducer is 40-50 percent, the water reducing rate is more than or equal to 28 percent, the solution A is an aqueous solution prepared by mixing methacrylic acid and methacrylic acid vinegar, the mass ratio of the methacrylic acid to the methacrylic acid vinegar is 1:2, the solution B is an aqueous solution prepared by mixing vitamin C and lyophylyl propanol, the mass ratio of the vitamin C to the mercapto-propanol is 1 (3.5-5.5), the mass ratio of the vitamin C to the potassium persulfate aqueous solution to the magnesium hydroxide aqueous solution to the methacrylic acid-polyethylene glycol methyl ether ester is 1:2.5:16:40:350, and the mass ratio of the sum of the mass of the methacrylic acid and the methacrylic acid vinegar to the mass of the polyether macromonomer is 1 (10-3).
The mud-resistant additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a self-made viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a magnesium lignosulfonate water reducing agent, the solid content of the magnesium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 40 parts of magnesium lignosulfonate water reducing agent, 34.75 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.25 part of organic silicon defoaming agent and 25 parts of deionized water. The anti-mud additive is uniformly mixed and added into the conventional machine-made sand concrete. The slump and the strength of the finally obtained machine-made sand concrete are excellent.
Example 8
The viscosity-reducing polycarboxylic acid water reducing agent is prepared by the following method: preparing an aqueous solution of methacrylic acid-polyethylene glycol methyl ether ester, adding the aqueous solution into a reaction kettle, heating the aqueous solution, adding an initiator with the total mass concentration of 42% into the reaction kettle for stirring reaction when the temperature is between 40 and 60 ℃, wherein the initiator is a mixed aqueous solution of potassium persulfate and ammonium persulfate, uniformly stirring the aqueous solution, simultaneously dropwise adding the solution A and the solution B into the reaction kettle for 4 to 8 hours while continuously stirring, keeping the temperature for 1.5 to 2.5 hours after dropwise adding, then adding a calcium hydroxide aqueous solution with the mass concentration of 31%, controlling the pH value between 7 and 9 to obtain the viscosity-reducing polycarboxylic acid water reducer, wherein the solid content of the viscosity-reducing polycarboxylic acid water reducer is between 40 and 50 percent, the water reduction rate is more than or equal to 28 percent, the solution A is an aqueous solution prepared by mixing methacrylic acid and methacrylic acid vinegar, the mass ratio of the methacrylic acid to the methacrylic acid vinegar is 1:2, the B solution is an aqueous solution formed by mixing vitamin C and sodium methallyl sulfonate, the mass ratio of the vitamin C to the sodium methallyl sulfonate is 1 (6.5-8.5), the mass ratio of the vitamin C to the potassium persulfate aqueous solution to the calcium hydroxide aqueous solution to the methacrylic acid-polyethylene glycol methyl ether ester is 1:1.5:14:35:250, and the mass ratio of the sum of the mass of the methacrylic acid and the methacrylic acid vinegar to the mass of the polyether macromonomer is 1 (10-3).
The mud-resistant additive suitable for machine-made sand concrete comprises a lignosulfonate water reducing agent, a self-made viscosity-reducing polycarboxylic acid water reducing agent, a defoaming agent and water, wherein the lignosulfonate water reducing agent is a calcium lignosulfonate water reducing agent, the solid content of the calcium lignosulfonate water reducing agent is 30-40%, the water reducing rate is 8-14%, and the defoaming agent is an organic silicon defoaming agent; the water is deionized water, and the mixing ratio is as follows according to parts by weight: 50 parts of calcium lignosulfonate water reducing agent, 20 parts of viscosity-reducing polycarboxylic acid water reducing agent, 0.2 part of organic silicon defoaming agent and 29.8 parts of deionized water. The anti-mud additive is uniformly mixed and added into the conventional machine-made sand concrete. The slump and the strength of the finally obtained machine-made sand concrete are excellent.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The mud-resistant additive is suitable for machine-made sand concrete and is characterized by comprising the following components in parts by weight:
2. the mud-resistant admixture suitable for machine-made sand concrete as claimed in claim 1, wherein the lignosulfonate water-reducing agent is sodium lignosulfonate water-reducing agent, the solid content of the sodium lignosulfonate water-reducing agent is 30-40%, and the water-reducing rate is 8-14%.
3. The mud-resistant admixture suitable for machine-made sand concrete as claimed in claim 1, wherein the solid content of the viscosity-reducing polycarboxylic acid water reducer is 40-50%, and the water-reducing rate is not less than 28%.
4. The mud resistant admixture for machine-made sand concrete as claimed in claim 1, wherein said defoamer is a silicone defoamer and said water is deionized water.
5. The mud-resistant admixture suitable for machine-made sand concrete as claimed in claim 1, wherein the viscosity-reducing polycarboxylic acid water reducer is prepared by the following method: preparing a polyether macromonomer aqueous solution, adding the polyether macromonomer aqueous solution into a reaction kettle, heating, then adding an initiator, uniformly stirring, then simultaneously dropwise adding the solution A and the solution B into the reaction kettle, continuously stirring while dropwise adding, preserving heat after dropwise adding is finished, then adding an alkaline substance, and controlling the pH value to be between 7 and 9 to obtain the viscosity-reduction type polycarboxylate superplasticizer;
the solution A is an aqueous solution formed by mixing methacrylic acid and methacrylic acid vinegar, and the solution B is an aqueous solution formed by mixing vitamin C and one of mercaptoethanol, mercaptopropanol or sodium methallyl sulfonate.
6. The mud-resistant admixture suitable for machine-made sand concrete as claimed in claim 5, wherein the heating temperature is 40-60 ℃, the dropping time of the solution A and the solution B is 4-8h, and the heat preservation time is 1.5-2.5 h.
7. The mud-resistant admixture suitable for machine-made sand concrete as claimed in claim 5, wherein the polyether macromonomer in the polyether macromonomer aqueous solution is methacrylic acid-polyethylene glycol methyl ether ester, the initiator is ammonium persulfate aqueous solution or potassium persulfate aqueous solution, and the alkaline substance is sodium hydroxide aqueous solution.
8. The mud-resistant admixture for machine-made sand concrete as claimed in claim 7, wherein when the solution B is an aqueous solution of vitamin C mixed with mercaptoethanol, the mass ratio of the vitamin C to the mercaptoethanol is 1 (2-4);
when the solution B is an aqueous solution formed by mixing vitamin C and lyophobic propanol, the mass ratio of the vitamin C to the lyophobic propanol is 1 (3.5-5.5);
when the solution B is an aqueous solution formed by mixing vitamin C and sodium methallyl sulfonate, the mass ratio of the vitamin C to the sodium methallyl sulfonate is 1 (6.5-8.5);
the mass ratio of the methacrylic acid to the methacrylic acid vinegar is 1 (2-3), and the mass ratio of the vitamin C, the ammonium persulfate aqueous solution, the sodium hydroxide aqueous solution, the methacrylic acid to the methacrylic acid-polyethylene glycol methyl ether ester is 1 (1.5-2.5): 14-16): 35-40): 250-350.
9. The method for compounding the mud-resistant admixture for machine-made sand concrete and the machine-made sand concrete according to any one of claims 1 to 8, wherein the compounding method comprises the following steps: weighing the components of the anti-mud additive according to the proportion, stirring the components at 40-60 ℃ for 5-7h, then preserving heat for 1.5-2.5h to obtain the anti-mud additive suitable for machine-made sand concrete, and then adding the machine-made sand concrete for compounding.
10. The method for compounding the mud-resistant admixture for machine-made sand concrete and the machine-made sand concrete according to any one of claims 1 to 8, wherein the compounding method comprises the following steps: weighing the components of the anti-mud additive according to the proportion, firstly adding the lignosulfonate water reducing agent into the machine-made sand concrete, then adding the viscosity-reducing polycarboxylic acid water reducing agent, the defoaming agent and water, stirring for 3-5h at 40-60 ℃, then preserving heat for 1-2h, and then continuously adding the machine-made sand concrete for compounding.
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Application publication date: 20200515 |