期刊
CEMENT AND CONCRETE RESEARCH
卷 125, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2019.105864
关键词
Durability; Limestone; Chloride binding; Friedel's salt solid solution
资金
- China Scholarship Council [201606090162]
- Construction Material Lab of EPFL
This paper presents a comparison of methods to quantify the chloride binding capacity for cementitious materials composed of Ordinary Portland Cement (OPC) and Limestone (LS, 0 to 55% replacement). Physical and chemical chloride bindings were investigated to better understand the binding capacity of the different systems and to provide basic information for modelling. Cement pastes samples were exposed to a 0.5 M NaCl solution and their chloride contents were quantified as free ions in pore solution, chemically bound ions in AFm phases, and physically bound ions on Calcium-Aluminum-Silicate-Hydrates (C-A-S--H). Notably, the study showed that (1) considering a solid solution between Friedel's salt and Hemicarboaluminate (He) was necessary for the quantification of chemically bound chlorides in limestone blended system and (2) an accurate estimation of the C-A-S-H content was critical for quantifying physically bound chlorides.
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