A study of the effect of light-burnt dolomite on the hydration of alkali-activated Portland blast-furnace slag cement

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• 作者：Wan-Hee Yang^a ; ^{dangchan74@empas.com" class="auth_mail} ; Dong-Woo Ryu^b ; Dong-Cheol Park^c ; Woo-Jae Kim^d ; Chee-Ho Seo^a
• 关键词：Alkali-activated cement ; Blast-furnace slag ; Light-burnt dolomite ; Sodium sulfate ; Heat of hydration
• 刊名：Construction and Building Materials
• 出版年：30 April, 2014
• 年：2014
• 卷：57
• 期：Complete
• 页码：24-29
• 全文大小：2162 K

文摘

This study used the typical powder alkaline material anhydrous sodium sulfate (Na₂SO₄) as an activator in a system in which Portland cement (10-20%) and ground granulated blast-furnace slag (GGBS, 80-90%) are generally mixed and added to light-burnt dolomite (LBD), one of the economical lime materials. Their effect on the hydration and strength of the cement was then analyzed. According to the analysis, the 1st peak of the minute heat of hydration increased after mixing the LBD. On the other hand, for the 2nd peak, a slight delay was observed. As a result of the mixing, the cumulative heat of hydration increased. Although the rate of setting decreased, the strength of the material improved after the 3rd, 7th and 28th days. In other words, it was confirmed that the pore structure of the paste became dense after 28 days of aging.