Switch type air entraining agent applicable to wet spraying concrete

Abstract

The invention discloses a switch type air entraining agent applicable to wet spraying concrete. The switch type air entraining agent consists of an ingredient A and an ingredient B, wherein through being metered in parts by mass, the ingredient A is a mixture of 30 to 50 parts of sapindoside powder, 5 to 15 parts of K12 surfactant (sodium dodecyl sulfate) powder and 8 to 12 parts of polyacrylamide powder; the ingredient B is a mixture of 18 to 27 parts of annular polydimethylsiloxane and 5 to 15 parts of hexadecyltrimethylammonium chloride powder; according to a mass ratio being (0.05 to 1):100, the ingredient A and the concrete are added into concrete slurry in the stirring process; according to a mass ratio being (0.015 to 0.03):100, the ingredient B and the concrete are carried and injected into the concrete slurry by compressed air in an air ring position of a spray gun connected with a concrete spraying pipe. The switch type air entraining agent has the advantages that good pumpable performance and sprayed coating performance are realized; the manufacturing cost and the use cost are low; green and environment-friendly effects are achieved; the use is safe; good market promotion values are realized.

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...

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

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