掺硅灰混凝土单轴压力荷载下的应力—应变全曲线及其破坏分析

掺硅灰及高效减水剂混凝土的强度较之相同水灰比、但单掺高效减水剂的混凝土有极显著的提高。前者的弹性模量、峰值应变、比例极限与棱柱强度之比也较后者高,因此前者具有更高抗裂性。这种混凝土的相组成、微观结构及集料-水泥石界面结构与单掺减水剂的混凝土有明显差别。破坏首先产生于粗集料本身而不是集料-水泥石界面。

The Complete Stress-strain Curves and Failure Analysis of Concrete with Silica Fume under Uniaxial Compressive Loads

The strength of concrete with both silica fume and super water- reducer is much higher than that of concrete simply with super- reducer for the same w/c ratio. Furthermore, the modulus of elasticity, the peak strain and the ratio of proportion limit and prism strength for the former are also higher than those for the latter. For this reason the former concrete has a higher crack resistance. There are considerable differences in the phase component, in the microstructure and in the interfacial structure of the aggregate- cement matrix between the silica/water-reducer concrete and the concrete with sole Super water-reducer. So the fracture for the former will go through the coarse aggregate granulas, and not along the interfaces of the aggregate-cement matrix first.