冻融循环下BFRPC断裂性能损伤分析  

Study on fracture damage of BFRPC under freeze-thaw cycles

作　　者：皇民 赵玉如 蔺世豪 王浩南 HUANG Min;ZHAO Yuru;LIN Shihao;WANG Haonan(School of Civil Engineering,Henan Institute of Engineering,Zhengzhou 451191,China)

机构地区：[1]河南工程学院土木工程学院,河南郑州451191

出　　处：《混凝土》2021年第12期31-35,共5页Concrete

基　　金：国家自然基金项目(50878187);河南省科技攻关计划(212102310290);河南省教育厅自然科学研究重点项目(12A560004);郑州市科技发展计划项目(20130816);河南工程学院博士基金项目(D2012008)。

摘　　要：以5种不同的玄武岩纤维体积百分比掺量(分别为0、0.1%、0.2%、0.3%、0.4%)设计5组试件,对玄武岩纤维增强透水混凝土(BFRPC)试件进行不同次数(分别为0、25、50、75、100、125次)的冻融试验,再利用三点弯曲法对透水混凝土试件进行加载。试验结果表明:掺加玄武岩纤维后,透水混凝土的断裂韧度和断裂能均明显提高。在0.3%掺量以内,BFRPC的断裂韧度和断裂能随纤维掺量增加而增加,纤维掺量提高至0.4%时,BFRPC断裂韧度和断裂能则略有下降;冻融循环导致透水混凝土的断裂韧度和断裂能明显降低,而玄武岩纤维对于透水混凝土的冻融损伤具有比较明显的抑制作用;BFRPC断裂韧度和断裂能的冻融损伤与冻融循环次数之间的关系均可以用幂函数y=axb来表示。同等条件下,BFRPC断裂韧度的拟合系数b值大于断裂能的拟合系数b值。Five groups of specimens were designed with five different volume percentages of basalt fiber(they are respectively 0,0.1%,0.2%,0.3%and 0.4%).The specimens of basalt fiber reinforced pervious concrete(BFRPC)were freeze-thawed for different times(they are respectively 0,25,50,75,100 and 125 times),and then the specimens were loaded by three-point bending method.The test results show that the fracture toughness and fracture energy of the pervious concrete are obviously improved by adding basalt fiber.Within0.3%,the fracture toughness and fracture energy of BFRPC increase with the increase of fiber content.When the fiber content is 0.4%,the fracture toughness and fracture energy of BFRPC will decrease slightly.The freeze-thaw cycle will lead to the obvious decrease of fracture toughness and fracture energy of pervious concrete.The relationship between the freeze-thaw damage of BFRPC fracture toughness and fracture energy and the number of freeze-thaw cycles can be expressed by power function y=axb.Under the same conditions,the fitting coefficient b of BFRPC fracture toughness is greater than that of fracture energy.

关 键 词：冻融循环 BFRPC 断裂韧度 断裂能 冻融损伤 

分 类 号：TU528.01[建筑科学—建筑技术科学]