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DYNAMIC MECHANICAL PROPERTIES OF ECOLOGICAL REACTIVE POWDER CONCRETE
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摘要: 以质量分数为50%～60%的超细工业废渣取代水泥,以普通黄砂取代磨细石英砂,制备了两个不同配比的生态型RPC材料,利用分离式Hopkinson压杆装置研究了应变速率、纤维掺量和基体组成对ECORPC各项动态力学性能及破坏形态的影响。结果显示,生态RPC材料具有应变率强化效应、峰值荷载及破坏应变随应变率的提高而增加。纤维增强的生态RPC材料的各项动态力学性能优于RPC基体,且在破坏过程中表现出极大的韧性和延性。多元超细工业废渣的复合效应优化了基体微观结构,增强了纤维与基体的界面粘结,促进了破坏形态从脆性向韧性的转化。Abstract: Two types of ecological reactive powder concretes (ECO-RPC) were prepared by substitution of ultra-fine industrial was te for 50%～60% cement by weight and replacement of ground fine quartz sand with natural fine sand. Through Hopkinson bar experiment the effect of strain rate, s teel fiber volume fraction and matrix composition on the dynamic mechanical prop erties and fracture pattern of ECO-RPC were researched.The results showed that ECO-RPC has strain rate strengthen effect. Peak stress and strain at peak stres s increase with the increase of strain rate.The dynamic mechanical prope rties of fiber reinforced ECO-RPC are superior to those of ECO-RPC matrix and ECO-RPC with fiber shows great toughness and ductility during the course of fra cture.The composition effects of ultra-fine industrial waste give benefit for t he matrix micro-structure and strengthen the bond between fiber and matrix so a s to make fracture pattern change from brittleness to toughness.
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