Durability Ⅴ

[1132] CHEMICAL EVOLUTION OF CEMENT-BASED MATERIALS IN SODIUM AND MAGNESIUM SULFATE SOLUTIONS

Yogarajah ELAKNESWARAN¹, Tetsuya ISHIDA² (1.The University of Tokyo 2.東京大学)

Keywords:Cement paste, Leaching, Solid phase changes, Sulfate attack, X-ray diffraction (XRD), 硫酸塩劣化, 溶脱, 鉱物変化, XRD, セメントペースト

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This paper presents the mineralogical distribution of three types of cement paste subjected to external sulfate attack. Specimens were immersed in water and sodium and magnesium sulfate solutions with 10 and 100 mmol/l of SO42− concentration for a period of 9 months. Solid phases in the specimens from the exposure surface to its core were quantified by XRD/Rietveld analysis, and the mineralogical distributions results are presented. Further, the influence of the composition of cement paste on the resistance to calcium leaching in pure water and ettringite-based external sulfate attack is discussed.