摘要
研究利用高钛矿渣(TS)完全取代天然骨料,制备了高钛矿渣超高性能混凝土(TS-UHPC)。研究了TS-UHPC的力学性能、自收缩和浆-骨界面结构,揭示了TS骨料与水泥基体的作用机制。结果表明:控制水泥用量小于500kg/m^(3),固废利用率超70%,可制得性能优异且强度等级为C120~C180的TS-UHPC。一方面,粗糙、多孔的TS骨料与浆体通过物理嵌固增加界面咬合。水化早期,TS的内养护效应有效减少了TS-UHPC浆体内部相对湿度的降低和自收缩值。另一方面,TS颗粒周围发生火山灰反应生成C-S-H及其衍生物覆盖于骨料表面并填充在浆-骨界面间隙,提高界面密实度。
The high titanium slag ultra-high performance concrete(TS-UHPC)was prepared with titanium slag(TS)completely replacing natural aggregate.Mechanical properties,autogenous shrinkage and paste-aggregate interface microstructure of TS-UHPC were studied.The interaction mechanism between TS aggregate and cement matrix was revealed.The results showed that TS-UHPC with excellent performance and strength grade of C120~C180 could be prepared by controlling cement content less than 500kg/m^(3)and solid waste utilization rate more than 70%.On one hand,the bite force of paste-aggregate interface was increased by physical embedding that between TS and cement matrix.At the early age of hydration,the IRH drop and autogenous shrinkage of TS-UHPC were effectively reduced through the internal curing effect of TS aggregate.On the other hand,the pozzolanic reaction was reacted around TS aggregate then produced C-S-H and its derivatives covering onto the surface of TS particles and filling into the interface gap,so as to improve the compactness of paste-aggregate interface.
作者
李晓英
李军
卢忠远
LI Xiao-ying;LI Jun;LU Zhong-yuan(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《武汉理工大学学报》
CAS
2022年第10期17-24,共8页
Journal of Wuhan University of Technology
基金
四川省科技计划项目(2019ZDZX0024)
西南科技大学博士基金项目(21zx7133)
关键词
高钛矿渣
超高性能混凝土
强度
自收缩
浆-骨界面作用机制
high titanium slag
ultra-high performance concrete
mechanical properties
autogenous shrinkage
interaction mechanism of paste-aggregate interface
