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Mechanism of Silica Fume in Suppressing Alkali-Silica Reaction of Concrete: Interfacial Transition Zone Concerns
The composition and structure of the interfacial transition zone (ITZ) in concrete were investigated to analyze the mechanism of silica fume in suppressing alkali-silica reaction (ASR). Alkali active concrete specimens with varying addition of silica fume were prepared for the experiment. Changes of compositions and pore structures at ITZ and the elements distribution across ITZ were analyzed by SEM and SEM-BSE. The expansion of the corresponding mortar bar was also measured. The results show that the accumulation of element of alkali metal occurred at ITZ in alkali active concrete without silica fume, while the characteristics of the ITZ are basically similar to those in conventional concrete. By addition of silica fume, the ITZ in alkali active concrete are changed and have the following features: disappearance of the accumulation, occurrence of the C-S-H gel with a lower CaO/SiO2 ratio, decrease in crystal phases of Ca(OH)2 and ettringite, and in porosity. These changes account for the mechanism of Silica fume in suppressing ASR.
Mechanism of Silica Fume in Suppressing Alkali-Silica Reaction of Concrete: Interfacial Transition Zone Concerns
The composition and structure of the interfacial transition zone (ITZ) in concrete were investigated to analyze the mechanism of silica fume in suppressing alkali-silica reaction (ASR). Alkali active concrete specimens with varying addition of silica fume were prepared for the experiment. Changes of compositions and pore structures at ITZ and the elements distribution across ITZ were analyzed by SEM and SEM-BSE. The expansion of the corresponding mortar bar was also measured. The results show that the accumulation of element of alkali metal occurred at ITZ in alkali active concrete without silica fume, while the characteristics of the ITZ are basically similar to those in conventional concrete. By addition of silica fume, the ITZ in alkali active concrete are changed and have the following features: disappearance of the accumulation, occurrence of the C-S-H gel with a lower CaO/SiO2 ratio, decrease in crystal phases of Ca(OH)2 and ettringite, and in porosity. These changes account for the mechanism of Silica fume in suppressing ASR.
Mechanism of Silica Fume in Suppressing Alkali-Silica Reaction of Concrete: Interfacial Transition Zone Concerns
Zhan, Bing-Gen (author) / Wang, Quan (author) / Zhou, Wan-Liang (author) / Sheng, Hong-Yu (author)
2012
7 Seiten
Conference paper
English
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