Effect of Silica Fume Quantity on Performance in Reactive Powder Concrete

In order to understand the effects of silica fume to Reactive Powder Concrete(RPC) performance and its enhancement mechanism in RPC,effects of quantity of silica fume in RPC on concrete density,relative density and compressive strength are discussed.The analysis indicates that micropacking silica fume works to the density and relative density of RPC,and its pozzolanic effect helps the strength of RPC.RPC200 having outstanding performance can be got when silica fume quantity is approximately 25%~35% of cement quantity.In order to reduce the cost and increase the RPC strength,the substitution of mixed minerals such as ultra-pulverized fly ash for silica fume quantity can be lower than 20%.