海水腐蚀环境下PVA-钢混杂纤维混凝土弯曲韧性研究

Research on Flexural Toughness of PVA-steel Hybrid Fiber Concrete under Marine Corrosion Environment

通过模拟海水环境,对同体积率下钢纤维和PVA纤维进行了混掺,采用干湿交替腐蚀方法研究了PVA-钢混杂纤维混凝土的弯曲韧性。结果表明,腐蚀后混杂纤维混凝土的初裂荷载、峰值荷载和弯曲强度均下降;PVA-钢混杂纤维混凝土经腐蚀后的混凝土韧性指数I_5、I_(10)和弯曲韧性比均降低,纤维对基体的耗能能力、延性和增韧效果下降明显。

By the simulation of the marine environment,the same volume ratio of steel fiber and PVA fiber are mixed with ordinary concrete to form fiber reinforced concrete.The flexural toughness of PVA-steel hybrid fiber concrete is studied by wet-dry cycle and immersion.The results show that the initial crack load,peak load and bending strength of hybrid fiber reinforced concrete decreases in different degrees after corrosion and in a certain range of fiber volume fraction.After the corrosion,the toughness index I5,I10 and the bending toughness ratio of concrete reduce,and which results in the decrease of the energy dissipation capacity,ductility and toughening effect obviously.