• influence of slag chemistry on the hydration of alkali-activated blast-furnace slag — part i: effect of mgo

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1204
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the hydration and the microstructure of three alkali activated slags (aas) with mgo contents between 8 and 13 wt.% are investigated. the slags were hydrated in the presence of two different alkaline activators, naoh and na2sio3·5h2o (wg). higher mgo content of the slag resulted in a faster reaction and higher compressive strengths during the first days. the formation of c(− a)–s–h and of a hydrotalcite-like phase was observed in all samples by x-ray diffraction (xrd), thermal analysis (tga) and scanning electron microscopy (sem) techniques. increasing the mgo content of the slag from 8 to 13% increased the amount of hydrotalcite and lowered the al uptake by c–s–h resulting in 9% higher volume of the hydrates and a 50 to 80% increase of the compressive strength after 28 days and longer for wg activated slag pastes. for naoh activated slags only a slight increase of the compressive strength was measured.

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