Effect of Water-To-Solid Ratio on the Strength Development and Cracking Performance of Alkali-Activated Fine Slag under Water Curing Condition

The present study aims to investigate the performance of alkali-activated fine slag under water curing condition. Ground granulated blast furnace slag (GGBFS) with a fineness of 6000 cm 2 /g was alkali-activated by the premixed alkaline solution from sodium hydroxide and sodium silicate liquid with...

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Published in2020 5th International Conference on Green Technology and Sustainable Development (GTSD) pp. 268 - 271
Main Authors Vo, Duy-Hai, Thi, Khanh-Dung Tran, Yehualaw, Mitiku Damtie, Hwang, Chao-Lung, Nguyen, Hoang-Anh, Tran, Vu-An
Format Conference Proceeding
LanguageEnglish
Published IEEE 27.11.2020
Subjects
alkali-activated fine slag
Concrete
Conductivity
cracking performance
Curing
Production
Slag
Sodium
Thermal conductivity
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Summary:The present study aims to investigate the performance of alkali-activated fine slag under water curing condition. Ground granulated blast furnace slag (GGBFS) with a fineness of 6000 cm 2 /g was alkali-activated by the premixed alkaline solution from sodium hydroxide and sodium silicate liquid with the constant Na 2 O concentration at 5% and the modulus ratio of SiO 2 /Na 2 O at 0.5. Water-to-solid (w/s) ratio varied from 0.3, 0.4 and 0.5 to examine the effect of w/s ratio on the strength development and cracking performance of the AAS specimens. The compressive strength test, crack observation, and thermal conductivity test were conducted. The compressive strength results showed that this property was adversely affected by the w/s ratio, and the strength slowly increased after 7 curing days. Macro-cracks occurred in water-cured AAS cubes and they were more server in the specimens with lower w/s ratio. Besides, as the w/s ratio decreased, these AAS performed higher thermal conductivity.
DOI:10.1109/GTSD50082.2020.9303136