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Title |
Microstructural Investigation on the Deterioration of Silica Fume Blended Cement Matrix Under Magnesium Sulfate Attack
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Keywords |
황산마그네슘 침식 ; 실리카 퓸 ; 기기분석 ; 반응생성물 Magnesium sulfate attack ; Silica fume ; Instrumental analyses ; Reactants |
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Abstract |
This paper reports the effect of replacement levels of silica fume on the resistance to magnesium sulfate attack. Mortar specimens incorporating silica fume were exposed to 5% magnesium sulfate solution for 360 days at ambient temperature. The main variable was the replacement levels of silica fume(0, 5, 10 and 15% of cement by mass). The resistance of mortar specimens incorporating silica fume against magnesium sulfate attack was regularly monitored by measuring compressive strength and expansion. In addition, in order to investigate the reactants formed by magnesium sulfate attack, various instrumental analyses such as XRD, SEM and DSC were used. Results demonstrated that the formation of gypsum, thaumasite and brucite led to a significant deterioration due to magnesium sulfate attack in cement matrix incorporating silica fume.
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