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A switch-type air-entraining agent suitable for wet shotcrete

A technology of wet sprayed concrete and concrete, which is applied in the field of concrete admixtures, and can solve problems such as the impact of concrete sprayability, low cohesion of concrete, and easy slump of concrete, so as to reduce the probability of clogging accidents and stabilize the molding quality , good molding effect

Active Publication Date: 2018-03-13
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is an irreconcilable contradiction between the fluidity of concrete and the slump after spraying of wet shotcrete: higher fluidity makes concrete have lower cohesion, and the concrete sprayed on the sprayed surface tends to collapse fall, which will have a certain impact on the sprayability of concrete

Method used

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  • A switch-type air-entraining agent suitable for wet shotcrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The above component A is a mixture of Sapindus soap powder, K12 surfactant powder and polyacrylamide powder, in parts by mass: 30-50 parts of Sapinberry soap powder, 5-15 parts of K12 surfactant, 8-12 parts of polyacrylamide powder;

[0034] The above component B is a mixture of cyclopolydimethylsiloxane and cetyltrimethylammonium sodium chloride powder, in parts by mass: 18-27 parts of cyclopolydimethylsiloxane, 5-15 parts of sodium cetyltrimethylammonium chloride powder;

[0035] The above-mentioned component A is added to the concrete slurry during the mixing process according to the mass ratio of 0.05-0.1:100 to the concrete;

[0036] The above component B is carried by compressed air and injected into the concrete slurry at the position of the wind ring of the spray gun connected to the concrete injection pipe according to the mass ratio of 0.015-0.03:100 to the concrete.

[0037] The pressure of the above-mentioned compressed air is 0.2-0.5MPa.

[0038] The abo...

Embodiment 2

[0048] The switch-type air-entraining agent suitable for wet shotcrete is composed of A component and B component, wherein, A component is used for concrete foaming, and B component is used for concrete defoaming;

[0049] The A component is a mixture of Sapindus soap powder, K12 surfactant powder and polyacrylamide powder, in parts by mass: 50 parts of Sapindus soap powder, 5 parts of K12 surfactant, polyacrylamide 8 parts of powder;

[0050] The B component is a mixture of cyclopolydimethylsiloxane and cetyltrimethylammonium sodium chloride powder, in parts by mass: 18 parts of cyclopolydimethylsiloxane, ten parts 15 parts of sodium hexaalkyltrimethylammonium chloride powder;

[0051] The above-mentioned component A is added to the concrete slurry during the mixing process according to the ratio of 0.1:100 to the mass ratio of the concrete;

[0052] The above component B is carried by compressed air and injected into the concrete slurry at the position of the air ring of t...

Embodiment 3

[0056] The switch-type air-entraining agent suitable for wet shotcrete is composed of A component and B component, wherein, A component is used for concrete foaming, and B component is used for concrete defoaming;

[0057] The A component is a mixture of Sapindus soap powder, K12 surfactant powder and polyacrylamide powder, in parts by mass: 40 parts of Sapindus soap powder, 9 parts of K12 surfactant, polyacrylamide 11 parts of powder;

[0058] The B component is a mixture of cyclopolydimethylsiloxane and cetyltrimethylammonium sodium chloride powder, in parts by mass: 24 parts of cyclopolydimethylsiloxane, ten 12 parts of sodium hexaalkyltrimethylammonium chloride powder;

[0059] The above-mentioned component A is added to the concrete slurry during the mixing process according to the ratio of 0.08:100 to the mass ratio of the concrete;

[0060] The above component B is carried by compressed air and injected into the concrete slurry at the position of the air ring of the spr...

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Abstract

The invention discloses a switch-type air-entraining agent suitable for wet sprayed concrete, which is composed of A component and B component, wherein, in parts by mass, A component is 30-50 parts of Sapinberry soap powder, K12 A mixture of 5-15 parts of surfactant (ie sodium lauryl sulfate) powder and 8-12 parts of polyacrylamide powder; component B is 18-27 parts of cyclopolydimethylsiloxane and 10 parts A mixture of 5-15 parts of hexaalkyltrimethylammonium chloride powder; the above-mentioned component A is added to the concrete slurry during the mixing process in a ratio of 0.05-0.1:100 to the mass ratio of the concrete; the above-mentioned B The components are injected into the concrete slurry by compressed air at the position of the air ring of the spray gun connected to the concrete injection pipe according to the mass ratio of 0.015-0.03:100 to the concrete. The invention has both good pumpability and sprayability, low manufacturing cost and use cost, environmental protection, safe use, and good market promotion value.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a switch-type air-entraining agent suitable for wet shotcrete. Background technique [0002] Wet shotcrete has high requirements on the pumpability of fresh concrete. Therefore, it is often necessary to add an air-entraining agent before mixing or during mixing to improve its flow performance and obtain good pumpability. performance. [0003] However, there is an irreconcilable contradiction between the fluidity of concrete and the slump after spraying of wet shotcrete: higher fluidity makes concrete have lower cohesion, and the concrete sprayed on the sprayed surface tends to collapse Falling will have a certain impact on the sprayability of concrete. [0004] How to endow concrete with fluidity and sprayable performance indicators at the same time has become the research and development direction of air-entraining agents, and is an important issue to be solved urgently by technicians i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/40
CPCC04B40/0039C04B2103/304C04B24/16C04B24/08C04B24/26C04B24/40C04B24/12
Inventor 刘国明程卫民薛娇王飞李振黄亚楠崔向飞冯如训白鹏陈连军
Owner SHANDONG UNIV OF SCI & TECH