玄武岩纤维煤矸石陶粒轻骨料混凝土冻融损伤研究  

Investigation on freeze-thaw damage of basalt fiber reinforced coal gangue ceramsite lightweight concrete

作　　者：李冬 朱喜朋 张鹏飞 李辉 郭庆 Li Dong;Zhu Xipeng;Zhang Pengfei;Li Hui;Guo Qing(College of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;Key Laboratory of Coal Gangue Resource Utilization and Energy-saving Building Materials,Fuxin 123000,China;China Construction Eighth Engineering Division Corp.Ltd.South China Branch,Guangzhou 510663,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁省煤矸石资源化利用及节能建材重点实验室,辽宁阜新123000 [3]中国建筑第八工程局有限公司华南分公司,广东广州510663

出　　处：《建筑科学》2024年第11期43-50,共8页Building Science

基　　金：辽宁省教育厅基本科研项目(青年项目)(LJKQZ20222268);辽宁省教育厅青年科技人才“育苗”项目(LJ2019QL010);辽宁省煤矸石资源化利用及节能建材重点实验室开放基金(LTUCE-2303)。

摘　　要：为研究冻融循环作用后玄武岩纤维煤矸石陶粒轻骨料混凝土性能劣化规律,设计了4种不同掺量的玄武岩纤维煤矸石陶粒混凝土,通过快冻法试验和轴心抗压试验,研究了玄武岩纤维对煤矸石陶粒混凝土相对动弹性模量、轴心抗压强度及峰值应变的影响规律。结果表明:掺入玄武岩纤维可以提高煤矸石陶粒混凝土的抗冻性,随着纤维掺量的增加,基体冻融损伤度显著减小,玄武岩纤维煤矸石陶粒混凝土的冻融损伤度服从威布尔分布。随着冻融循环次数的增加,煤矸石陶粒混凝土轴心抗压强度和峰值应变显著变化,玄武岩纤维通过提高基体的抗冻性使冻融损伤后混凝土轴心抗压强度显著提高、峰值应变显著降低。基体相对轴心抗压强度与冻融损伤度之间呈指数变化关系,基体相对峰值应变与冻融损伤度之间呈线性变化关系。In order to study the performance of basalt fiber reinforced coal gangue ceramsite light weight aggregate concrete after freeze-thaw cycles,four types of basalt fiber reinforced coal gangue ceramsite concrete with different fiber dosages are designed,and the quick freeze-thaw test and axial compressive test are adopted.The effects of basalt fibers on the relative dynamic of elastic modulus,axial compressive strength and peak strain of coal gangue ceramsite concrete are studied.The results show that the frost resistance of coal gangue ceramsite concrete can be improved by the addition of the basalt fibers,and the freeze-thaw damage value of the matrix is significantly reduced with the increasing of fiber content.The damage value of the basalt fiber reinforced coal gangue ceramsite concrete obeys the Weibull distribution.With the increment of the number of freeze-thaw cycles,the axial compressive strength and peak strain of the coal gangue ceramsite concrete change significantly,and the axial compressive strength of concrete after freeze-thaw damage increased obviously and the peak strain of decreased significantly.There is an exponential relationship between the relative axial compressive strength of the matrix and the value of freeze-thaw damage,and a linear relationship between the peak strain of the matrix and the value of freeze-thaw damage.

关 键 词：煤矸石陶粒 损伤度 威布尔分布 轴心抗压强度 峰值应变 玄武岩纤维 

分 类 号：TU528[建筑科学—建筑技术科学]