Workability analysis of lightweight aggregate concrete mixture use air entrainment admixture

Tóm tắt

In the production of lightweight aggregate concrete, there is always a tendency to stratify the lightweight aggregates during transportation and construction, because the unit weight of lightweight aggregates is often much smaller than that of the cement mortar in the mix. This paper presents some analysis results on workability, calculating relative stratification reduction and quality factor of LC when using Air Entrainment Admixture (AD) that most of experimental results presented on the referent [5]. Experimental and analytical results show that the effect of AD depends on the amount of use; significantly reduce the stratification of the mix, reducing the density without much effect on the quality factor of the concrete when it is used at the appropriate concentration, in this study it was about 0.02%.