碳纤维混杂纤维混凝土抗冲击性能研究

摘要

对比美国混凝土学会的混凝土落锤冲击试验装置,自行设计了混凝土落锤弯曲冲击试验装置,进行了不同几何尺寸及弹性模量的碳纤维、钢纤维和聚丙烯纤维混凝土的抗冲击力学性能试验研究.分析比较了不同纤维几何尺寸和弹性模量、种类和掺量对混杂纤维混凝土抗冲击性能的影响和增强机理.通过定义混杂效应系数,可定量评价混凝土抗冲击力学性能的正混杂效应.研究表明:纤维可以明显提高混凝土的抗冲击强度,其中碳纤维混杂纤维混凝土的提高幅度更为显著.%An impact bending test method for concrete and test equipments were developed compared with impact test methods suggested by the ACI, and the impact mechanical properties of hybrid fiber reinforced concrete ( HyFRC) with different kinds and percents of carbon fiber, steel fibers and polypropylene fiber were investigated, and the effect of fiber types and contents on HyFRC's impact performance was analyzed. A hybrid factor to evaluate quantitatively the positive hybrid effect of concrete anti-impact behavior was suggested. The study results showed that hybrid carbon fiber reinforced concrete has better impact resistance capacity compared with that of ofher concrete.