硫酸盐侵蚀下钢纤维自密实混凝土表面损伤层变化研究  

Research on the Change of Surface Damage Layer of Steel Fiber Self-compacting Concrete under Sulfate Erosion

作　　者：廖昶 陈亦苏 杨兴 LIAO Chang;CHEN Yisu;YANG Xing(Guizhou Construction Science Research&Design Institute Limited Company of CSCEC/Guizhou Construction Science Research and Testing Center,Guiyang 550006,Guizhou,China)

机构地区：[1]贵州中建建筑科研设计院有限公司/贵州省建筑科学研究检测中心,贵州贵阳550006

出　　处：《工程技术研究》2023年第15期25-27,共3页Engineering and Technological Research

摘　　要：文章制备了两组钢纤维自密实混凝土试件,将其浸泡在不同浓度的硫酸盐溶液中,浸泡后测试钢纤维自密实混凝土的静力受压弹性模量,并观察其表面损伤层裂缝,计算弹性模量损失率、锈蚀深度、锈蚀率,确定表面损伤层变化的物理量。试验结果表明,在侵蚀时间超出8 d前,钢纤维自密实混凝土表面锈蚀深度与锈蚀率增长较缓慢,但是当锈蚀时间超出8 d后,钢纤维自密实混凝土表面锈蚀深度和锈蚀率快速增长,为实际中钢纤维自密实混凝土防护提供了一定的参考。Two groups of steel fiber self-compacting concrete specimens were prepared and immersed in sulfate solution with different concentrations.After immersion,the static compressive elastic modulus of steel fiber self-compacting concrete was tested,and the cracks in the surface damage layer were observed.The elastic modulus loss rate,corrosion depth and corrosion rate were calculated to determine the physical quantity of the change of the surface damage layer.The test results show that the surface corrosion depth and corrosion rate of the steel fiber self-compacting concrete increase slowly before the corrosion time exceeds 8 days.However,when the corrosion time exceeds 8 days,the surface corrosion depth and corrosion rate of steel fiber self-compacting concrete increase rapidly,which provides a certain reference for the protection of steel fiber selfcompacting concrete in practice.

关 键 词：硫酸盐侵蚀 钢纤维自密实混凝土 损伤层 模拟实验法 弹性模量损失率 

分 类 号：TU528[建筑科学—建筑技术科学]