Effects of sulfate and magnesium ion on the chloride transportation behavior and binding capacity of Portland cement mortar
作者： Shukai Cheng , Zhonghe Shui , Tao Sun , Xu Gao , Cheng Guo
DOI: 10.1016/J.CONBUILDMAT.2019.01.132
关键词:
摘要: Abstract The chloride diffusion induced reinforcement corrosion seriously threatens the durability of concrete construction in marine environments. This paper investigates effects sulfate and magnesium ion simulated seawater on transportation behavior binding capacity Portland cement mortar with without fly ash (FA) ground blast furnace slag (BFS). Chloride transport profile, products specimens exposed to NaCl, NaCl + MgCl2, NaCl + Na2SO4 NaCl + MgCl2 + Na2SO4 solutions at different penetration depths were conducted respectively. Results indicate that samples NaCl + MgCl2 show highest content outmost layer (0–5 mm). presence combined salt accelerates ingress increase apparent coefficient, while reduces calcium hydroxide thus results a reduction binding. However, inhibits diffusion, enhances bound refined pore size due formation Friedel’s (Fs) ion. Furthermore, addition BFS significantly improves resistance into specimens.
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