玄武岩纤维混凝土断裂性能实验研究

发布时间：2018-03-29 19:47

  本文选题：玄武岩纤维混凝土　切入点：断裂性能　出处：《哈尔滨工程大学学报》2016年08期

【摘要】：为探讨玄武岩纤维混凝土的断裂性能,对31组相对切口深度为0.4的玄武岩纤维混凝土试件进行了三点弯曲实验,分析了玄武岩纤维混凝土的裂纹扩展过程,从断裂韧度、断裂能和延性指数三个方面对玄武岩纤维混凝土的断裂性能进行评价,探讨了玄武岩纤维对混凝土断裂性能的影响机理。结果表明:掺入适量纤维可以有效提高混凝土的断裂韧度、断裂能和延性指数,但这种提高与纤维特征系数不成线性关系。纤维对混凝土的断裂性能同时存在增强和削弱两种影响。通过引入以纤维特征系数为变量的削弱系数和削弱函数,获得了较高精度的各断裂参数关于纤维长径比和体积率的表达式,提出了玄武岩纤维混凝土的配比优化方案,可为玄武纤维混凝土的断裂性能研究提供参考。
[Abstract]:In order to study the fracture properties of basalt fiber reinforced concrete, 31 groups of basalt fiber reinforced concrete specimens with relative notch depth of 0.4 were subjected to three-point bending test. The crack propagation process of basalt fiber reinforced concrete was analyzed, and the fracture toughness was analyzed. The fracture properties of basalt fiber reinforced concrete are evaluated from three aspects of fracture energy and ductility index. The influence mechanism of basalt fiber on the fracture properties of concrete is discussed. The results show that adding appropriate amount of fiber can effectively improve the fracture toughness, fracture energy and ductility index of concrete. However, there is no linear relationship between the increase and the fiber characteristic coefficient. There are two kinds of effects of fiber on the fracture properties of concrete. By introducing the weakening coefficient and weakening function with fiber characteristic coefficient as variable, The expressions of the ratio of fiber length to diameter and volume rate of each fracture parameter with high accuracy are obtained, and the optimization scheme of basalt fiber reinforced concrete is put forward, which can be used as a reference for the study of the fracture properties of Black Tortoise fiber reinforced concrete.
【作者单位】： 哈尔滨工程大学航天与建筑工程学院;
【基金】：国家自然科学基金项目(51409056) 黑龙江省自然科学基金项目(E2015047) 中央高校基本科研业务费专项资金项目(HEUCF160202)
【分类号】：TU528
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本文编号：1682606