Research on the Design of Limestone Manufactured Sand Concrete in Guangxi

Natural river sand is unevenly distributing local resources and it is extremely scarce in the karst region.Considering the practical situation of highway construction projects in Guangxi,the manufactured sand concrete with strength degree of C30~C50 used in bridge and pavement were designed and optimized in this paper.Results indicate that,by appropriate adjusting the stone powder contented of manufactured sand,the performance of manufactured sand concrete was significantly improved.The workability of the fresh concrete was significantly improved and segregation tendency was reduced when fly ash was used in manufactured sand of concrete.