关键词: 再生骨料构成;力学性能;冻融循环

Abstract: Mechanics and durability were specified by test at different constitution of recycle aggregate (RA).The results show that the compressive strength of block of recycle cement mortar(RCM)concrete is higher before 28 d; however, strength of nature aggregate(NA)concrete is still beyond to other composition of RA concrete for long term.Mass loss of RA concrete below 5%is found experienced one hundred freeze-thaw cycles.Decay rate on compressive strength of NA and RCM concrete is below to 25%,however,higher value than 25% are measured in recycle mix-aggregate containing 30% recycle brick(RB)and 70%RCM concrete and RB concrete.RA concrete with various compositions can meet the requirement of P10 impermeability grade,following greater impermeability on NA concrete,and then RB concrete, recycle mix-aggregate concrete and lower RB concrete.Resistances to chloride ion penetration keep in line with impermeability of concretes.RB has little influence on mechanics properties of RA concrete,and then negative effect s is more prominent to durability.

Key words: constituent of recycled aggregate;mechanics;freeze-thaw cycle