摘要
设计制作了花岗岩–砂浆复合试件,通过劈裂试验,研究了砂浆水灰比、粘结面粗糙度和界面剂中硅灰含量对复合试件劈裂抗拉强度的影响,并给出了它们之间的拟合关系。引入复合试件与相同水灰比砂浆试件劈裂抗拉强度的比值,表征界面过渡区的薄弱性。结果表明,复合试件的劈裂抗拉强度明显低于相同水灰比的砂浆基质试件,且与水灰比呈负线性相关关系;增加花岗岩表面粗糙度可以提高复合试件的劈裂抗拉强度,复合试件的劈裂抗拉强度与界面粗糙度呈近似线性关系;界面剂中加入硅灰可以提高复合试件的劈裂抗拉强度,然而过多的硅灰掺量会适得其反,复合试件的劈裂抗拉强度与硅灰含量的关系可以用二次抛物线拟合,最佳硅灰含量约为3%。
The granite-mortar hybrid specimens were designed and fabricated.The effects of the water-cement ratio of mortar,the roughness of the bonding surface and the silica fume content in the interface agent on the splitting tensile strength of the hybrid specimen were studied through the splitting test,and the fitting relationships among them were given.The ratio of splitting tensile strength between hybrid specimens and pure mortar specimens with the same water-cement ratio was introduced to indicate the weakness of the interfacial transition zone.The results show that the splitting tensile strength of the hybrid specimens is significantly lower than that of the pure mortar specimens with the same water-cement ratio and has a negative linear correlation with the water-cement ratio of mortar.Increasing the surface roughness of granite can improve the splitting tensile strength of hybrid specimens,and the relationship between the splitting tensile strength and the interface roughness is approximately linear.In addition,adding silica fume to the interface agent can improve the splitting tensile strength of the hybrid specimen,but too much silica fume content would be just the opposite.The relationship between the splitting tensile strength of the hybrid specimen and the silica fume content can be fitted with a parabolic function,and the optimal silica fume content is about 3%.
作者
邹相国
姬和力
杨新华
罗祖赟
白凡
ZOU Xiangguo;JI Heli;YANG Xinhua;LUO Zuyun;BAI Fan(POWERCHINA Hubei Electric Engineering Co Ltd,Wuhan 430040,China;School of Aerospace Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;College of Science,Wuhan University of Science and Technology,Wuhan 430065,China)
出处
《土木工程与管理学报》
2021年第6期17-24,共8页
Journal of Civil Engineering and Management
基金
国家自然科学基金(11832013,12072120)。
关键词
界面过渡区
劈裂试验
花岗岩–砂浆复合试件
断裂特性
interfacial transition zone
splitting test
granite-mortar hybrid specimen
fracture property
