玄武岩纤维-风积沙混凝土抗冲击试验研究  

Experimental Study on Impact Resistance of Basalt Fiber-aeolian Sand Concrete

作　　者：解国梁[1] 申向东[2] 姜伟[1] 张斌[1] XIE Guo-liang;SHEN Xiang-dong;JIANG Wei;ZHANG Bin(School of Civil Engineering and Water Conservancy,Heilongjiang Bayi Agricultural University,Daqing Heilongjiang 163319,China;School of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot Inner Mongolia 010018,China)

机构地区：[1]黑龙江八一农垦大学土木水利学院,黑龙江大庆163319 [2]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《公路交通科技》2021年第8期9-15,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51769025);住房和城乡建设部研究开发项目(2020-K-162);黑龙江八一农垦大学横向课题(2041200002)。

摘　　要：为了满足道路水泥混凝土承受动荷载的使用需求,纤维提升水泥混凝土的抗冲击能力具有较强的优势。采用玄武岩纤维(BF)增强风积沙混凝土(ASC)的抗冲击性能,研究BF体积掺量对ASC抗冲击性能的影响规律及作用机制。设计了不同体积掺量(0,0. 05%,0. 1%,0. 15%和0. 2%)的玄武岩纤维风积沙混凝土,利用自制落锤式装置对其进行抗冲击试验研究,同时采用数理统计模型对抗冲击次数进行拟合及失效概率预测。结果表明:ASC的抗冲击性能指标随BF掺量的增加呈现出开口向下的抛物线变化趋势,BF体积掺量为0. 1%时,混凝土的抗冲击性能指标均达到最大,其终裂次数、延性比和韧性系数分别为普通风积沙混凝土的1. 75倍,4. 41倍和2. 75倍;BF对ASC的增强、增韧主要依靠纤维与水泥基体之间的摩擦力和机械咬合力实现,破坏主要是因为BF被拔出及BF与水泥石界面区水化产物脱落;玄武岩纤维风积沙混凝土抗冲击次数服从Weibull双参数分布模型,初裂次数和终裂次数试验数据点基本分布在一条直线上。建立了玄武岩纤维风积沙混凝土不同失效概率下(0. 1,0. 2和0. 3)的抗冲击次数与BF体积掺量之间的函数模型,模型表明玄武岩纤维风积沙混凝土抗冲击次数随着失效概率的增加而增大,随纤维掺量的增加呈先增大后减小。In order to meet the demand of road cement concrete to bear dynamic load,fiber has a strong advantage in improving the impact resistance of cement concrete.The impact resistance of aeolian sand concrete(ASC)is enhanced by basalt fiber(BF),and the influence and the action mechanism of volume content of BF on the impact resistance of ASC is studied.The basalt fiber aeolian sand concrete with different volumes(0,0.05%,0.1%,0.15%and 0.2%)are designed,and the impact resistance test is carried out by using the self-made drop hammer device.At the same time,the number of impact resistance is fitted and the failure probability prediction is predicted by mathematical statistical model.The result shows that(1)The impact resistance indicator of ASC shows a parabola trend downward with the increase of BF content.When the volume of BF is 0.1%,the impact resistance indicator of concrete reaches the maximum,and the final crack times,ductility ratio and toughness coefficient are 1.75 times,4.41 times and 2.75 times of those of ordinary aeolian sand concrete.(2)The strengthening and toughening of ASC by BF mainly depends on the friction force and mechanical bite force between fiber and cement matrix,and the failure is mainly due to the pulling out of BF and the falling off of hydration products in the interface area between BF and cement stone.(3)The impact resistance times of basalt fiber aeolian sand concrete are in accordance with Weibull double-parameter distribution model,and the data points of initial crack times and final cracking times are basically distributed in a straight line.The function model between the impact resistance times of basalt fiber aeolian sand concrete and the volume content of BF under different failure probabilities(0.1,0.2,0.3)is established.The model shows that the impact resistance times of basalt fiber aeolian sand concrete increase with the increase of failure probability,and increases first and then decreases with the increase of fiber content.

关 键 词：道路工程 抗冲击性能 落锤 玄武岩纤维风积沙混凝土 失效概率 Weibull双参数分布 

分 类 号：U416.216[交通运输工程—道路与铁道工程]