The effect of supplementary cementitious materials on the permeability of chloride in steam cured high-ferrite Portland cement concrete

• DOI: 10.1016/j.conbuildmat.2018.11.107
• Publication Date: 2018-11-27T13:41:21Z
• Authors: Xiao Huang; Shuguang Hu; Fazhou Wang; Lu Yang; Meijuan Rao; Yuandong Mu; Caixia Wang
• Keywords: Silica fume; Cementitious; Precast concrete; Metakaolin

Abstract As a typical kind of sulphate resistance Portland cement (SRPC), high-ferrite Portland cement (HFPC) has drawn extensive interesting, and is expected to be used in marine environment, but the low chloride resistance is a primary issue and requires to be notably enhanced. This study therefore has investigated the effects of the curing temperature and supplementary cementitious materials (SCMs) on chloride migration in HFPC precast concrete. The results show that two representative SCMs, namely, silica fume (SF) and metakaolin (MK), could significantly improve the resistance of steam cured HFPC concrete to chloride permeation. The improving mechanism of SF is based on optimization of the pore structure to retard migration of chloride, while MK is based on promotion of the chloride binding capacity. This study could give an insight into a new type of precast concrete with excellent sulphate and chloride resistance in marine environment.