高强混凝土的脆性与断裂面特征的关系

Relationship between Brittleness and Characterization of Fracture Surface for High Strength Concrete

给出了基于荷载挠度全曲线的脆性指数B和基于断裂面的脆性指数R ,对不同材料组成的混凝土试验测定了这两种脆性和强度 ,比较了这两种脆性的相关性 ,指出了混凝土材料的脆性实质上是断裂面上的脆性指数R的变化 .通过掺入冶金集料改变断裂面的脆性指数R ,使混凝土的脆性减小并提高了混凝土的强度 .

Based on the complete load-displacement curve and fracture surface, the brittleness index B and R are presented respectively in the paper. The parameters, including two brittleness indexes and strength, are measured by experiments. The correlation between B and R is given and it is pointed out that the inherence of brittleness is embodied on the fracture surface. Replacing part of normal aggregate with metallic aggregate, the brittleness of concrete is decreased and the strength of concrete is increased.