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Title |
The Strength Properties of Alkali-Activated Slag Mortars by Combined Caustic Alkali with Sodium Carbonate as Activator
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DOI |
https://doi.org/10.4334/JKCI.2012.24.6.745 |
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Keywords |
가소성 알칼리 ; 탄산나트륨 ; 혼합 알칼리 ; 알칼리 활성화 슬래그 모르타르 ; 압축강도 caustic alkalis ; sodium carbonate ; combined alkalis ; alkali-activated slag mortar ; compressive strength |
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Abstract |
This paper studies the effect of the compressive strength for combined alkali-activated slag mortars. The effect of activators such as alkali type and dosage factor on the strength was investigated. The alkalis combinations made using five caustic alkalis (sodium hydroxide (NaOH, A series), calcium hydroxide (Ca(OH)2, B series), magnesium hydroxide (Mg(OH)2, C series), aluminum hydroxide (Al(OH)3, D series), and potassium hydroxide (KOH, E series)) with sodium carbonate (Na2CO3) were evaluated. The mixtures were combined in different dosage at 1M, 2M, and 3M. The study results showed that the compressive strength of combined alkali-activated slag mortars tended to increase with increasing sodium carbonate. The strength of combined alkaliactivated slag mortars was better than that of control cases (without sodium carbonate). The result from scanning electron microscopy (SEM) analysis confirmed that there were reaction products of calcium silicate hydrate (C-S-H) and alumina-silicate gels from combined alkali-activated slag specimens.
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