Reducing agent specially used for chips concrete

Abstract

The invention discloses a shrinkage-reducing agent used for stone chip concrete, which is made from the following raw materials according to mass percentage as follows: an expanding agent 73-91%, a naphthalene-based superplasticizer 8-15%, a polyalcohol 0.5-3%, a surfactant 0-0.5%, and a polyhydroxylated compound 0-8%. In order to solve the problem that stone chip concrete has high shrinkage rateduring the engineering application, the concrete is incorporated with the inventive shrinkage-reducing agent, accounting for 6-8% of the total weight of the binder, so as to efficiently control and reduce the dry shrinkage of concrete without changing the workability, cohesiveness and pumpability of concrete or the required construction technical conditions. Tests prove that the inventive shrinkage-reducing agent can reduce the shrinkage rate of stone chip concrete by more than 30% under the same conditions.

Description

technical field The invention relates to a shrinkage reducer for stone chip concrete, which belongs to the technical field of concrete. Background technique Concrete is prepared by mixing cementitious materials, fine aggregates, coarse aggregates, water and admixtures in a certain proportion. Natural sand as fine aggregate is an indispensable part of concrete. At present, my country is in the peak period of engineering construction, the demand for construction sand is gradually increasing, and the distribution of natural sand resources in my country is very uneven, and the natural sand resources in some places are difficult to meet the needs of engineering construction. Sand mining has made the problem of shortage of natural sand resources increasingly prominent. In addition, natural sand is an endemic resource and is not suitable for long-distance transportation. For some large-scale water conservancy projects, they are generally located in remote places with inconvenien...

AI Technical Summary

Problems solved by technology

Although stone chips are economical and have a broad market prospect, some research results also show that: because stone chips contain a certain proportion of stone powder, concrete prepared with stone chips instead of natural sand can be used under the same conditions (with the ratio of water to cement). ) shrinkage rate is larger than ordinary natural sand concrete

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