• influence of activator type on hydration kinetics, hydrate assemblage and microstructural development of alkali activated blast-furnace slags

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1125
    • تعداد پرسش و پاسخ ها: 0
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     the hydration of two slags with different al2o3 contents activated with sodium hydroxide and hydrous sodium metasilicate (commonly named water glass) is studied using a multi-method approach. in all systems, c-s-h incorporating aluminium and a hydrotalcite-like phase with mg/al ratio ~ 2 are the main hydration products. the c-s-h gels present in naoh activated pastes are more crystalline and contain less water; a calcium silicate hydrate (c-s-h) and a sodium rich c-n-s-h with a similar ca content are observed at longer hydration times. the activation using naoh results in high early strength, but strength at 7 days and longer is lower than for the sodium metasilicate systems. the drastic difference in c-s-h structure leads to a coarser capillary porosity and to lower compressive strength for the naoh activated than for the sodium metasilicate activated slags at the same degree of slag reaction.

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