Effect of super absorbent polymer on the properties of reactive powder concrete
Super absorbent polymer(SAP)was introduced in reactive powder concrete(RPC)to reduce shrinkage.In this pa-per,in order to investigate the effect of SAP on the properties of RPC,indoor experiments on the properties of RPC were carried out to compare and analyze the effects of dosage,mixing method,and extra water of SAP on the fluidity,strength,shrinkage,and chlorine ion permeability of RPC.The results showed that the dry SAP reduced the fluidity of RPC significantly,and the appropri-ate amount of extra water was able to maintain the available fluidity.Furthermore,SAP reduced the strength and shrinkage of RPC to a degree that increased with the increase of the dosage and the amount of extra water,but the diffusion coefficient of chlorine i-ons showed a tendency to decrease first and then increase.The use of pre-absorbed SAP resulted in better overall performance of RPC with minimized strength loss and optimized shrinkage and impermeability,achieving a 29%reduction in shrinkage and 19.62%decrease in chloride permeability coefficient by 0.4%SAP with 0.46 total water-cement ratio.
NETL
NSTL
万方数据
