Key Factors of Homogeneity Control of Lightweight Aggregate High Performance Concrete

Abstract

In this paper, the effect of lightweight aggregate size, paste viscosity and air-entraining component on the homogeneity of lightweight aggregate concrete was studied. Quantitative analysis was carried out by homogeneity test device. In addition, the mixture extension and the compression strength of concrete at 28 days were investigated to comprehensively evaluate the performance of the lightweight aggregate concrete. It was found that the ceramsite with a crushed-type and a size of 5-16mm can obviously improve the homogeneity of the lightweight aggregate concrete which was benefit for the homogeneity control of the lightweight aggregate concrete. The addition of thickener can effectively improve the homogeneity of the mixture, and the optimum content of the inorganic-organic component was 3% and 0.2%, respectively. When the chemical admixture was compounded with 1 ‰ defoamer and 0.4 ‰ air entraining agent, the lightweight aggregate concrete had optimal homogeneous, workability and compressive strength.