摘要
为了研究纤维对再生混凝土(RAC)的增韧效果,取体积掺量为0.5%、1.0%、1.5%的钢纤维和0.6%、0.9%、1.2%的聚丙烯纤维以单掺和混掺的方式掺入RAC中,采用四点弯曲试验对其弯曲性能进行研究,并分析了其微观增韧机理。结果表明:钢纤维和聚丙烯纤维的掺入对RAC弯曲破坏时承受的最大荷载、初裂挠度及韧性指数均有很大的改善,且混杂纤维改善效果优于单掺纤维。当钢纤维体积掺量为1.0%聚丙烯体积掺量为0.9%时,混杂纤维再生混凝土表现出良好的混杂效应,对弯曲性能的改善最为理想。
In order to study the toughening effect of fiber on recycled aggregate concrete( RAC),the steel fiber( SF) with volume fraction of 0. 5%,1. 0%,1. 5% and polypropylene fiber( PPF) with volume fraction of 0. 6%,0. 9% and 1. 2% were mixed into RAC by single-doped and blended. And the bending performance was analyzed by four point bending test. The micro toughening mechanism was also studied. Test results show that the maximum load,the initial cracking deflection and toughness indices of RAC are significantly improved by incorporated of fibers. And the improvement effect of hybrid fiber is better than that of single doped. The optimal fiber content is 1. 0% steel fiber and 0. 9% polypropylene fiber,which shows an most ideal flexural performance.
引文
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