摘要
为研究钢渣微粉替代石英粉制备生态型超高性能混凝土(ultra high performance concrete,UHPC)的配合比,在改进的Andreasen-Andersen(modified Andreasen-Andersen,MAA)模型的基础上,采用正交试验法对钢渣微粉UHPC配合比进行优化,开展其抗压强度、劈裂抗拉强度、抗折强度、弹性模量等力学性能测试,以研究硅灰、钢渣微粉、河砂和钢纤维4个因素掺量对钢渣微粉UHPC各项性能指标的影响,进而分析各力学性能指标下配合比优方案,确定最佳配合比。试验结果表明:钢纤维体积掺量对钢渣微粉UHPC各项力学性能影响最为显著,河砂、钢渣微粉掺量影响程度较大,硅灰掺量影响程度较小。经优化后钢渣微粉UHPC的最佳配合比为:硅灰掺量为418 kg/m^(3),钢渣微粉掺量为126 kg/m^(3),河砂掺量为836 kg/m^(3),钢纤维体积掺量为1.5%,制备出的超高性能混凝土坍落度为200 mm,扩展度为320 mm,28 d立方体抗压强度达到152.0 MPa,具有良好的工作性能和力学性能,满足工程设计要求。
In order to study the design of the mix proportion for the preparation of eco-friendly ultra high performance concrete(UHPC)by replacing quartz powder with steel slag powder,the orthogonal test method was used to optimize the mix ratio of steel slag powder UHPC based on the modified Andreasen-Andersen model.And the mechanical properties such as compressive strength,splitting tensile strength,flexural strength and modulus of elasticity were tested to study the effects of silica fume,steel slag powder,river sand and steel fiber on the performance indexes of steel slag powder UHPC.The test results show that the volume dosing of steel fibers has the most significant effect on the mechanical properties of the steel slag powder UHPC,while the dosing of river sand and steel slag powder has a greater effect and the dosing of silica fume has a less effect.After optimization,the best ratio of steel slag powder UHPC is 418 kg/m^(3) of silica fume,126 kg/m^(3) of steel slag powder,836 kg/m^(3) of river sand and 1.5% of steel fiber by volume,the prepared ultra high performance concrete has a slump of 200 mm,an expansion of 320 mm and a 28 d cubic compressive strength of 152.0 MPa.The concrete has good workability and mechanical properties,which meets the requirements of the project design.
作者
陈晟豪
唐咸远
马杰灵
罗杰
唐运灼
沈诗昀
陈如苹
郑金莲
CHEN Shenghao;TANG Xianyuan;MAJieling;LUO Jie;TANG Yunzhuo;SHEN Shiyun;CHEN Ruping;ZHENG Jinlian(School of Architecture and Transportation Engineering,Guilin University of Electronic Technology,Guilin 541004,China)
出处
《广西科技大学学报》
2023年第2期52-60,共9页
Journal of Guangxi University of Science and Technology
基金
国家自然科学基金项目(42067044)
国家级大学生创新训练计划项目(202110595067)
广西研究生教育创新计划项目(C21YJM00JZ02)资助。
作者简介
第一作者:陈晟豪,在读本科生;通信作者:唐咸远,博士,正高级工程师,研究方向:道路工程材料及超高性能混凝土材料,E-mail:thy1188@126.com。
