生态型活性粉末混凝土单轴压缩力学性能

MECHANICAL PROPERTIES OF ECOLOGICAL REACTIVE POWDER CONCRETE UNDER UNIAXIAL COMPRESSION

对不同钢纤维体积率的生态型活性粉末混凝土 (ECO RPC)进行了系统的准静态两种应变率单轴压缩试验 ,试验结果表明 :超细钢纤维的加入 ,不仅进一步提高了ECO RPC的强度 ,而且还显著地提高其韧性和阻裂能力 ,使ECO RPC破坏形态从脆性改变到假塑性 ,弹性模量和泊松比也分别相应有所微增与微减 ;随着应变率增大 ,相同配合比ECO RPC的应力 -应变全曲线形状保持很好的相似性 ,强度提高 ,韧性下降 ,ECO RPC基体韧度的下降程度大于掺钢纤维的ECO RPC。

Based on the experiments,this paper systematically studied the quasi-static mechanical properties of ecological reactive powder concrete(ECO-RPC) with different fiber volume fractions( V f) under uniaxial compression with two strain rates.The experimental results showed that the adding of steel fiber into the ECO-RPC matrix led to not only further strengthening but also remarkably toughening and crack arresting of the composites,and the destruction pattern of ECO-RPC was changed from brittleness to pseudo plasticity.With the increase of the V f,the elastic modulus and Poisson's ratio of ECO-RPC were changed only a little.It was also found that the stress-strain curves of the same mix proportion of ECO-RPC with different strain rate were somewhat similar,with the strength and the peak strain increased but the toughness decreased when the strain rate increased,and the toughness of ECO-RPC matrix decreased more than those of steel fiber reinforced ECO-RPC.