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Title |
The Strength and Drying Shrinkage Properties of Alkali-activated Slag using Hard-burned MgO
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Authors |
김태완(Tae-Wan Kim) ; 전유빈(Yubin Jun) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.3.039 |
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Keywords |
수산화칼륨 ; 산화마그네슘 ; 알칼리 활성화 슬래그 시멘트 ; 강도 ; 건조수축 Potassium hydroxide ; Magnesium oxide ; Alkali-activated slag cement ; Strength ; Drying shrinkage |
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Abstract |
In this study, the properties of strength and drying shrinkage of alkali-activated slag cement (AASC) with magnesium oxide (MgO) contents between 0 and 16 wt% were investigated. The ground granulated furnace blast slag (GGBFS) was activated by potassium hydroxide (KOH) and dosage of activator was 2M and 4M. The MgO was replaced with 2% to 16% of GGBFS by weight. The water-binder ratio (w/b) was 0.5. In the result, the higher MgO content leads to a slightly higher degree of reaction and thus to a higher compressive strength at all ages. The compressive strength and ultra sonic velocity (UPV) increased with increases MgO contents. The drying shrinkage of AASC was decreased as the contents of MgO increases. The results from SEM confirmed that there were densified reaction product of higher MgO content specimens.
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