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Advances in Civil Engineering
Volume 2018, Article ID 1426037, 8 pages
https://doi.org/10.1155/2018/1426037
Research Article

Applications of Steel Slag Powder and Steel Slag Aggregate in Ultra-High Performance Concrete

Department of Civil Engineering, Tsinghua University, Beijing 100084, China

Correspondence should be addressed to Runhua Guo; nc.ude.auhgnist@hroug

Received 21 October 2017; Accepted 19 November 2017; Published 30 January 2018

Academic Editor: Peng Zhang

Copyright © 2018 Jin Liu and Runhua Guo. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The applications of steel slag powder and steel slag aggregate in ultra-high performance concrete (UHPC) were investigated by determining the fluidity, nonevaporable water content, and pore structure of paste and the compressive strength of concrete and by observing the morphologies of hardened paste and the concrete fracture surface. The results show that the fluidity of the paste containing steel slag is higher. The nonevaporable water content of the hardened paste containing steel slag powder is close to that of the control sample at late ages. Both steel slag powder and steel slag aggregate react and connect tightly to gels and hardened paste, respectively. When the cement replacement ratio is no more than 10%, the proportion of pores larger than 50 nm in the hardened paste containing steel slag powder is close to that of the control sample, and the UHPC containing steel slag powder can display satisfactory compressive strengths. The UHPC containing steel slag aggregate demonstrates higher compressive strengths.