Journal
APPLIED CLAY SCIENCE
Volume 158, Issue -, Pages 186-194Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.clay.2018.03.038
Keywords
Chemical binding; Chloride ions; AFm phase; Aluminum; Metakaolin
Funding
- National Natural Science Foundation of China (NSFC) [51578551, U1534207]
- Ministry of Science and Technology of China (MOST) [2016YFB0303603-4]
- Science and Technology Department of Province Fujian [2015 J06012]
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In this study, chloride ions binding capacity of Portland cement blended with 10-30% of metakaolin was investigated. Chemical binding of chloride ions was found depending more on phase assemblage of pastes rather than merely on available aluminum content in the blends. More monosulfoaluminate formed at low replacement levels, while at high replacement levels of metakaolin, stratlingite formation in the blends was favored. When exposed to 0.53 M NaCI solution at ambient temperature, monosulfoaluminate converted to Friedel's salt completely, and played a principal role in chemical binding of chloride ions while ettringite and stratlingite did not participate in the chemical binding of chloride ions. Considering the exposure condition, the contribution of monocarboaluminate in chemical binding was less significant than that of monosulfoaluminate. Results demonstrated that well formulated Portland cement-metakaolin blends with appreciate metakaolin replacement level and sulfate supply are expected to have good chloride binding capacity.
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