高钛重矿渣砂对超高性能混凝土(UHPC)性能的影响  

Effect of High Titanium Heavy Slag Sand on the Properties of Ultra-high Performance Concrete(UHPC)

作　　者：陈超[1] 张恒 CHEN Chao;ZHANG Heng(Huaxin Cement Co.,Ltd.,Wuhan 430070,China)

机构地区：[1]华新水泥股份有限公司,湖北武汉430070

出　　处：《混凝土与水泥制品》2023年第1期74-78,83,共6页China Concrete and Cement Products

摘　　要：研究了高钛重矿渣砂的冷却方式、粒径、细度模数和颗粒级配、渣粉含量、预湿时间对超高性能混凝土(UHPC)工作性和力学性能的影响,采用SEM观察了UHPC的微观结构。结果表明:与慢冷高钛重矿渣砂相比,掺快冷高钛重矿渣砂UHPC的工作性略差,但力学性能较好;随着快冷高钛重矿渣砂粒径的增大,UHPC的工作性和力学性能均先提升后下降,推荐粒径为0.60~2.36 mm;采用细度模数为2.6且位于Ⅱ区中值的快冷高钛重矿渣砂制备的UHPC工作性和力学性能优异;随着渣粉含量的增加,UHPC的工作性和力学性能先提升后下降,快冷高钛重矿渣砂中的渣粉含量应控制在6%以下;随着快冷高钛重矿渣砂预湿时间的增加,UHPC的工作性和力学性能先提升后基本不变,最佳预湿时间为12 h。The effects of cooling mode,particle size,fineness modulus and particle size distribution,slag powder content and pre-wetting time of high titanium heavy slag sand on the workability and mechanical properties of ultra-high performance concrete(UHPC)were studied,and the microstructure of UHPC was observed by SEM.The results show that compared with slow-cooling high titanium heavy slag sand,the UHPC mixed with fast-cooling high titanium heavy slag sand has poorer workability,but better mechanical properties.With the increase of particle size of fast-cooling high titanium heavy slag sand,the workability and mechanical properties of UHPC are improved first and then decreased,and the recommended particle size is 0.60~2.36 mm.The UHPC prepared with fast-cooling high titanium heavy slag sand with fineness modulus of 2.6 and median value in zoneⅡhas excellent workability and mechanical properties.With the increase of slag powder content,the workability and mechanical properties of UHPC are improved first and then decreased,and the slag powder content in fast-cooling high titanium heavy slag sand should be controlled below 6%.With the increase of pre-wetting time of fast-cooling high titanium heavy slag sand,the workability and mechanical properties of UHPC are improved first and then basically unchanged,and the optimal pre-wetting time is 12 h.

关 键 词：超高性能混凝土(UHPC) 高钛重矿渣砂 工作性 力学性能 微观结构 

分 类 号：TU528.041[建筑科学—建筑技术科学]