文献类型：期刊文献

英文题名：Microstructure of ultra high performance concrete containing lithium slag

作者：He, Zhi-hai[1];Du, Shi-gui[1];Chen, Deng[2]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Suzhou Univ Sci & Technol, Coll Civil Engn, Suzhou 215011, Peoples R China

年份：2018

卷号：353

起止页码：35

外文期刊名：JOURNAL OF HAZARDOUS MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000438002800005)、、EI(收录号：20181504994633)、Scopus(收录号：2-s2.0-85044951728)、WOS

基金：The authors would like to acknowledge the National Natural Science Foundation of China (Grant Nos. 51602198 and 41427802) for their financial support to the work present in this paper.

语种：英文

外文关键词：Ultra high performance concrete; Microstructure; Lithium slag; Pore structure; Interfacial transition zone; Nanoindentation

外文摘要：Lithium slag (LS) is discharged as a byproduct in the process of the lithium carbonate, and it is very urgent to explore an efficient way to recycle LS in order to protect the environments and save resources. Many available supplementary cementitious materials for partial replacement of cement and/or silica fume (SF) can be used to prepare ultra high performance concrete (UHPC). The effect of LS to replace SF partially by weight used as a supplementary cementitious material (0%, 5%, 10% and 15% of binder) on the compressive strengths and microstructure evolution of UHPC has experimentally been studied by multi-techniques including mercury intrusion porosimetry, scanning electron microscope and nanoindentation technique. The results show that the use of IS degrades the microstructure of UHPC at early ages, and however, the use of LS with the appropriate content improves microstructure of UHPC at later ages. The hydration products of UHPC are mainly dominated by ultrahigh density calcium-silicate-hydrate (UHD C-S-H) and interfacial transition zone (ITZ) in UHPC has similar compact microstructure with the matrix. The use of IS improves the hydration degree of UHPC and increases the elastic modulus of ITZ in UHPC. LS is a promising substitute for SF for preparation UHPC.