生态型RPC材料的断裂力学行为研究

Study on the fracture mechanical properties of ecological reactive powder concrete

以质量分数为 5 0 %～ 60 %的超细工业废渣取代水泥 ,以普通黄砂取代磨细石英砂 ,制备了2个系列不同配比的生态型RPC材料 ,并研究了纤维掺量及养护制度对其断裂力学性能的影响规律 .结果显示 ,随着纤维掺量的增加 ,生态RPC的断裂能及断裂韧度不断提高 ;在标准养护条件下 ,生态RPC的延性指数在纤维体积率为 2 %时最大 .随着养护温度的提高 ,生态RPC的极限断裂强度不断提高 ,但同时其脆性也在增加 ,从而表现出断裂能。

Two types of ecological reactive powder concrete(ECO RPC) were prepared by substitution of ultra fine industrial waste for 50%-60% cement by weight and replacement of ground fine quartz sand with natural fine sand. The effects of the volume fraction of steel fiber and curing conditions on the fracture mechanical properties of ECO RPC were studied.The results showed that the fracture energy and fracture toughness of ECO RPC increased with the increasing of fiber. Under the standard curing conditions the ductility index of ECO RPC reached a maximum when the fiber volume fraction is 2%. With the rising of curing temperature the maximum fracture strength of ECO RPC and its brittleness were improved. The effects of curing conditions on fracture energy, fracture toughness and ductility index are different from each other.