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Title |
Effects of Basicity on the Carbonation Characteristics of Alkali-Activated Slag Mortar
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Authors |
송금일 ; 이방연 ; 홍건호 ; 공민호 ; 송진규 |
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DOI |
https://doi.org/10.4334/JKCI.2012.24.5.577 |
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Keywords |
알칼리 활성슬래그 ; 고로슬래그 ; 염기도 ; 탄산화 alkali-activated slag ; blast-furnace slag ; basicity ; carbonation |
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Abstract |
Carbonation resistance is one of the most influencing factors on durability of concrete. Alkali activated slag (AAS) is known to have weaker resistance for carbonation than OPC due to the low calcium contents. In this paper, the carbonation characteristic of AAS mortar which is related to the basicity (CaO/SiO2) was investigated. In order to give the various basicity conditions, SM (source material) was blended with quicklime (CaO) and silicon dioxide (SiO2) by adopting mechano-chemical treatment method. Experiments including flow test, compressive strength test, carbonation depth test, together with XRD, FTIR and TGA were employed to evaluate the effects of basicity of SM on the carbonation characteristics. The test results showed that the carbonation resistance effectively increased with the increase of the basicity of SM.
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