硅灰掺量对纤维混凝土力学性能影响试验研究  

Experimental Research on Influences of Silica Fume Content on Mechanical Properties of Fibre Concrete

作　　者：周代昱 谢群[1] 赵鹏 鞠好学[2] 张鸿[2] ZHOU Daiyu;XIE Qun;ZHAO Peng;JU Haoxue;ZHANG Hong(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;Rural Revitalization Industry School,Shandong Institute of Commerce and Technology,Jinan 250103,Shandong,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]山东商业职业技术学院乡村振兴产业学院,山东济南250103

出　　处：《济南大学学报（自然科学版）》2023年第5期599-606,共8页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金青年科学基金项目(52108214);山东省住房城乡建设科学技术计划项目(2020-K5-18);建筑结构加固改造与地下空间工程教育部重点实验室开放课题项目(MEKL202006)。

摘　　要：为了探究硅灰替换水泥掺入纤维混凝土后,纤维混凝土抗压、抗折、抗初裂冲击和抗破坏冲击等性能的优劣,在掺加硅灰的质量分数为0、5%、7.5%、10%时,对纤维素纤维与聚乙烯纤维体积质量均为0.9 kg/m 3的纤维混凝土试件进行破坏分析与力学性能分析。结果表明:当硅灰质量分数为5.0%时,纤维混凝土的抗压强度、抗破坏冲击耗能达到最佳,分别为53.5 MPa、9417.6 kJ;当硅灰质量分数为7.5%时,纤维混凝土的抗初裂冲击耗能为6621.8 kJ,达到最佳;硅灰的掺加使纤维混凝土的抗折强度减小,掺量过大会导致纤维混凝土力学性能劣化。To explore advantages and disadvantages of compressive behaviour,flexural performance,initial crack impact resistance,and destructive impact resistance of fibre concrete after replacing cement with silica fume,in the case of silica fume mass fraction of 0,5%,7.5%,and 10%,destructive analysis and mechanical properties analysis of fibre concrete speciments with both cellulose fibre and polyethene fibre mass concentration of 0.9 kg/m 3 were conducted.The results show that when the silica fume mass fraction is 5.0%,the compressive strength and destructive impact resistance energy consumption are the best,which are 53.5 MPa and 9417.6 kJ respectively.When the silica fume mass fraction is 7.5%,the initial crack impact resistance energy consumption is the best,which is 6621.8 kJ.The addition of silica fume will reduce the flexural strength of fibre concrete,and excessive silica fume will lead to the deterioration of the mechanical properties of fibre concrete.

关 键 词：纤维混凝土 硅灰 力学试验 抗压强度 抗折强度 抗冲击性能 

分 类 号：TU528[建筑科学—建筑技术科学]