water-reducing admixture การใช้

• This is generally accomplished by using water - reducing admixtures . specify air - entrained concrete for outdoor slabs subjected to freezing weather
• Adding air - entrained agent can enhance the heat preservation performance of pumice concrete and improve its durability . using water - reducing admixture can improve the performance of pumice concrete , but the quantum is bigger than in the ordinary concrete
• Due to the fact that the study consequence about the influence of water - reducing admixture on the early - age shrinkge is scarce , this paper also broadly study influence of water - reducing admixture on the early - age shrinkge , drying shrinkage and whole shrinkge
• Eight concrete samples of different compound ratio of artificial lightweight aggregate ( coarse aggregate of expanded shale ) and ordinary aggregate , water - reducing admixture , expanding admixture , etc , are compounded firstly , based on the research of main properties such as agitating property , strength , dry surface density and deformation , an optimum compound ratio of the concrete with high strength ( cl40 ) , light density ( 1800 ) and slight expand is achieved