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根据活性粉末混凝土密实配合比设计原理,结合福建当地材料制备3个系列混凝土试件,研究不同纤维品种、掺量对RPC基本力学性能的影响规律,并采用Instron电液伺服式疲劳试验得到纤维增强RPC疲劳寿命发展情况及分布规律。掺入聚丙烯纤维对RPC抗压强度、劈裂强度、弯折强度及延性具有一定程度提升,但效果不明显。钢纤维掺量对RPC强度具有较明显增强效果,抗压强度随掺量呈抛物线增长规律;劈裂、弯折强度随钢纤维掺量呈线性及指数增长趋势。RPC平均疲劳寿命随聚丙烯纤维掺量呈抛物线增长规律,随钢纤维掺量呈明显递增趋势。分析给出各力学指标随2种纤维掺量的回归关系式。统计分析各系列试件的疲劳试验数据,RPC弯曲疲劳寿命与对应的概率函数线性相关显著,服从两参数威布尔分布,计算给出存活率-疲劳寿命曲线。
According to the compact design principle of reactive powder concrete, three series of concrete specimens were prepared from local materials of Fujian Province to study the influence laws of different fiber varieties and dosages on the basic mechanical properties of RPC. Instron electro-hydraulic servo fatigue test was used to obtain fiber reinforced Development and distribution of RPC fatigue life. The incorporation of polypropylene fiber to RPC compressive strength, splitting strength, bending strength and ductility to a certain extent, but the effect is not obvious. The steel fiber content has obvious enhancement effect on the RPC strength, and the compressive strength shows a parabolic growth law with the dosage. The splitting and bending strength increases linearly and exponentially with the steel fiber content. The average fatigue life of RPC shows a parabolic law with the increase of polypropylene fiber content, which shows an obvious increasing trend with the steel fiber content. Analyzed and given the mechanical parameters with the two kinds of fiber content of the regression equation. Statistical analysis of the fatigue test data of each series of specimens, RPC bending fatigue life and the corresponding probability function linearly significant, obeying the two parameters Weibull distribution, calculate the survival rate - fatigue life curve.