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采用直径15μm的两种长度(6、18 mm)的玄武岩纤维,制成不同体积掺量(0%,0.4%,0.6%和0.8%)的玄武岩纤维混凝土,采用U形试件及自制的落锤冲击装置,对其进行抗冲击试验,分析玄武岩纤维混凝土的抗冲击性能。试验结果表明:玄武岩纤维能够提高混凝土的抗冲击次数。对试验结果采用威布尔分布进行统计分析和失效概率预测,分析结果表明:威布尔分布可以有效地对基于U形试件的玄武岩纤维混凝土抗冲击性能进行统计分析。以玄武岩纤维混凝土在冲击试验中的初裂和终裂次数的自然对数来评价其抗冲击性能,则在相同的失效概率情况下,玄武岩纤维混凝土的抗冲击性能与玄武岩纤维的掺量近似呈线性关系。且在相同的失效概率和玄武岩纤维掺量的条件下,6 mm短纤维对混凝土的抗冲击性能的改善作用优于18 mm长纤维。
Basalt fiber reinforced concrete with different volume contents (0%, 0.4%, 0.6% and 0.8%) was made by using basalt fiber of two lengths (6,18 mm) with a diameter of 15 μm. U-shaped specimens and self- Hammer impact device, its impact test, analysis of basalt fiber reinforced concrete impact resistance. The test results show that basalt fiber can improve the impact resistance of concrete. Weibull distribution was used for statistical analysis and failure probability prediction. The results show that Weibull distribution can effectively analyze the impact resistance of basalt fiber reinforced concrete based on U-shaped specimen. Based on the natural logarithm of the initial crack and the final crack number of basalt fiber reinforced concrete in impact test, the impact resistance of basalt fiber reinforced concrete is similar to that of basalt fiber under the same failure probability Linear relationship. Under the same failure probability and basalt fiber content, the improvement effect of 6 mm short fiber on the impact resistance of concrete is better than that of 18 mm long fiber.