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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 8392435, 14 pages
https://doi.org/10.1155/2017/8392435
Research Article

The Role of Phosphorus Slag in Steam-Cured Concrete

School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China

Correspondence should be addressed to Dongmin Wang

Received 12 March 2017; Accepted 22 March 2017; Published 24 April 2017

Academic Editor: Xiao-Jian Gao

Copyright © 2017 Jin Liu and Dongmin Wang. 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

Steam curing is an effective method to increase the hydration degree of binder containing phosphorus slag. The role of phosphorus slag in steam-cured concrete was investigated by determining the hydration heat, hydration products, nonevaporable water content, pore structure of paste, and the compressive strength and chloride ion permeability of concrete. The results show that elevated steam curing temperature does not lead to new crystalline hydration products of the composite binder containing phosphorus slag. Elevating steam curing temperature enhances the early hydration heat and nonevaporable water content of the binder containing phosphorus slag more significantly than increasing steam curing time, and it also results in higher late-age hydration degree and finer pore structure. For steam-cured concrete containing phosphorus slag, elevating curing temperature from 60°C to 80°C tends to decrease the late-age strength and increase the chloride permeability. However, at constant curing temperature of 60°C, the steam-cured concrete containing phosphorus slag can achieve satisfied demoulding strength and late-age strength and chloride permeability by extending the steam curing duration.