Anti-mud additive suitable for machine-made sand concrete and compounding method thereof

A technology of concrete and machine-made sand, which is applied in the field of building materials and concrete to achieve the effects of non-destructive product quality, high fluidity, and strong defoaming power

Inactive Publication Date: 2020-05-15
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent reports a polycarboxylate superplasticizer as the basic raw material, mixed with a small amount of retarder and defoamer, but this admixture is only for machine-made sand C120 ultra-high-strength concrete

Method used

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  • Anti-mud additive suitable for machine-made sand concrete and compounding method thereof
  • Anti-mud additive suitable for machine-made sand concrete and compounding method thereof
  • Anti-mud additive suitable for machine-made sand concrete and compounding method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 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 it to the reaction kettle and heating, and then adding the mass concentration after heating to 40-60°C The 42% ammonium persulfate aqueous solution is used as the initiator for the stirring reaction. After stirring evenly, the A solution and the B solution are added dropwise to the reaction kettle at the same time. The dropping time is 4-8h, and the stirring is continued while the addition is complete. After heat preservation for 1.5-2.5h, after adding a sodium hydroxide aqueous solution with a mass concentration of 31%, and controlling the pH value between 7-9, the viscosity-reducing polycarboxylic acid water reducer is obtained. The solid content of the water agent is 40-50%, and the water reduction rate is ≥28%. Among them, the A solution is an aqueous solution formed by mix...

Embodiment 2

[0036] An anti-mud admixture suitable for machine-made sand concrete. The anti-mud admixture includes a lignosulfonate water reducer, the viscosity-reducing polycarboxylic acid water reducer prepared in Example 1, a defoamer and water, The lignosulfonate water-reducing agent is 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 Silicone defoamer; water is deionized water, based on parts by weight, with the following ratios: 45 parts of sodium lignosulfonate water reducer, 34.8 parts of viscosity reducing polycarboxylic acid water reducer, and 0.2 parts of silicone defoamer Parts, 20 parts deionized water. The components of the anti-mud admixture were stirred at 60°C for 7 hours, and then heated for 2.5 hours, and then evenly mixed into the machine-made sand concrete. The weight of the anti-mud admixture was the amount of the cementitious material ...

Embodiment 3

[0038] An anti-mud admixture suitable for machine-made sand concrete. The anti-mud admixture includes a lignosulfonate water reducer, the viscosity-reducing polycarboxylic acid water reducer prepared in Example 1, a defoamer and water, The lignosulfonate water-reducing agent is 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 Organic silicon defoaming agent; water is deionized water, based on parts by weight, with the following ratios: 50 parts of sodium lignosulfonate water reducing agent, 20 parts of viscosity reducing polycarboxylic acid water reducing agent, and silicone defoaming agent 0.2 Parts, 29.8 parts deionized water. Stir the components of the anti-mud admixture at 50°C for 6 hours, then heat for 2 hours and mix them evenly into the machine-made sand concrete. The weight of the anti-mud admixture is the weight of the cementitious mat...

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Abstract

The invention relates to an anti-mud additive suitable for machine-made sand concrete and a compounding method thereof. The anti-mud additive comprises the following components in parts by weight: 30-50 parts of a lignosulfonate water reducing agent, 20-35 parts of a viscosity reduction type polycarboxylic acid water reducing agent, 0.2-0.25 part of a defoaming agent and 20-45 parts of water. Thecompounding method specifically comprises the following steps: mixing and compounding the mud-resistant admixture and the machine-made sand concrete, wherein 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 anti-mud additive can be used for improving the mud resistance of the machine-made sand concrete, and the cohesiveness and compressive strength of the machine-made sand concrete can be remarkably improved.

Description

Technical field [0001] The invention relates to the field of building building materials concrete, in particular to a mud-resistant admixture suitable for machine-made sand concrete and a compounding method thereof. Background technique [0002] Cement concrete is one of the most widely used and most used building materials in the field of civil engineering today, and it plays a function and role that other materials cannot replace. Although natural sand has been used as a traditional concrete fine aggregate for a long time, because it is a non-renewable energy source, with the continuous reduction of natural sand resources, the existing storage of natural sand can no longer meet the needs of producing concrete raw materials, and machine-made sand replaces natural Sand effectively solves this demand. Replacing natural sand with a suitable amount of machine-made sand is the guiding direction of the current government and industry, and it is an inevitable requirement for taking th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2647C04B40/0039C04B2103/302C04B24/18C04B24/42
Inventor 孙振平张成光葛好升
Owner TONGJI UNIV
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