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MECHANICAL PROPERTIES OF ECOLOGICAL REACTIVE POWDER CONCRETE UNDER UNIAXIAL COMPRESSION
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摘要: 对不同钢纤维体积率的生态型活性粉末混凝土(ECORPC)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ECORPC的强度，而且还显著地提高其韧性和阻裂能力，使ECORPC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ECORPC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，ECORPC基体韧度的下降程度大于掺钢纤维的ECORPC。Abstract: 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.
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