摘要
碱性环境不仅是影响玻璃纤维耐久性的重要环境因素,也会与混凝土中粉煤灰活性成分发生反应。为了探索碱性环境下玻璃纤维对混凝土抗渗性能的影响,将暴露在碱性环境60d的玻璃纤维体积率为0%、0.5%、1.0%、1.5%的混凝土进行抗压、孔隙率、抗渗和扫描电子显微镜(SEM)试验。结果表明:碱性环境中Ca(OH)_(2)与SiO_(2)和Al_(2)O_(3)发生反应,粉煤灰颗粒表面出现了明显的刻蚀,产生大面积细小空隙。玻璃纤维对混凝土各基体间起到粘结作用,承担了一部分拉应力。在碱性环境中,玻璃纤维体积率为1.0%为最佳体积率,此时抗压强度提高了22.19%,渗透高度减小了18.52%。建立了碱性环境作用下玻璃纤维混凝土孔隙率与渗透高度关系模型、孔隙率与抗压强度关系模型,为工程设计提供参考。
Alkaline environment is not only an important environmental factor affecting the durability of glass fiber,but also reacts with the active components of fly ash in concrete.In order to explore the influence of glass fiber on the impermeability of concrete in alkaline environment,the concrete with glass fiber volume ratio of 0%,0.5%,1.0%and 1.5%exposed to alkaline environment for 60days was tested for compression,porosity,impermeability and scanning electron microscope(SEM).The results show that Ca(OH)_(2)reacts with SiO_(2)and Al_(2)O_(3)in alkaline environment,and there is obvious etching on the surface of fly ash particles,resulting in a large area of small voids.Glass fiber plays a bonding role between the concrete substrates and bears part of the tensile stress.In alkaline environment,the volume ratio of glass fiber is 1.0%.At this time,the compressive strength increases by 22.19%,and the penetration height decreases by 18.52%.The relationship model between porosity and permeability height and the relationship model between porosity and compressive strength of glass fiber reinforced concrete under alkaline environment are established,which provides a reference for engineering design.
作者
黎惠莹
杨文瑞
仵卫伟
冯中敏
王世玉
全伟杰
LI Hui-ying;YANG Wen-rui;WU Wei-wei;FENG Zhong-min;WANG Shi-yu;QUAN Wei-jie(School of Civil and Architectural Engineering,East China University of Technology,Nanchang 330013,China;School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)
出处
《武汉理工大学学报》
CAS
2022年第9期27-34,共8页
Journal of Wuhan University of Technology
基金
国家自然科学基金(51868001)
江西省自然科学基金(20181BAB216027)
江西省教育厅科技项目(GJJ170486)
博士启动金(DHBK2017119)
江西省交通运输厅重点科技项目(2016C0007)
关键词
碱性环境
玻璃纤维
抗渗性能
孔隙率
微观结构
alkaline environment
glass fiber
impermeability
porosity
microstructure
