Impact Study Of Polyacrylate On The Performance Of Reactive Powder Concrete

In light of basic composition of Reactive Powder Concrete (RPC), mainly studied are the influence and amelioration effect of polymer on the behaviors of RPC through indoor tests according to the status quo and problems of RPC at home and abroad.To select cementations material composed of cement--slag--silica fume for a trial, under the target of concrete mobility, discussed are the compatibility among superplasticizer, powder material and Polyacrylic Ester (PAE) so as to select the superplasticizer of better compatibility with cement and reactive powder in low ratio water-binder; and under the target of mortar mobility and strength, to select optimum admixture of superplasticizer for RPC, water-binder ratio and sand-binder ratio, binder material composition proportion, and proper mixture period.Based on successfu composition of RPC, emphasis is laid on effects of polyacrylic ester polymer admixture, curing system, mineral admixture on mechanic performance and plastic shrinkage of reactive powder concrete. With further closer observation, amelioration effect of polymer on RPC is revealed.The research results demonstrate that blending of polymer improves flexural strength but makes durability strength decline. Therefore the flexural and durability ratio increase. Thus durability of RPC without steel fiber is improved. The strength of polymer reactive powder concrete is remarkably meliorated with blending of mineral admixture. RPC shows great capability for plastic shrinkage under standard condition, but blending of polymer improves plastic shrinkage property of RPC. The plastic shrinkage capability greatly declines under curing condition, but addition of polymer shows no obvious effects on RPC.