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Title |
Simplified Carbonation Model Considering Ca(OH)2 Solubility and Porosity Reduction
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Authors |
이윤(Yun Lee) ; 권성준(Seung-Jun Kwon) ; 박기태(Ki-Tae Park) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.1.128 |
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Keywords |
탄산화 ; 해석모델 ; 확산계수 ; 수산화칼슘 ; 공극률 감소 Carbonation model ; Diffusion coefficient ; Calcium hydroxide ; Porosity reduction |
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Abstract |
Carbonation is one of the most critical deterioration phenomena to concrete structures exposed to high CO2 concentration, sheltered from rain. Lots of researches have been performed on evaluation of carbonation depth and changes in hydrate compositions, however carbonation modeling is limitedly carried out due to complicated carbonic reaction and diffusion coefficient. This study presents a simplified carbonation model considering diffusion coefficient, solubility of Ca(OH)2, porosity reduction, and carbonic reaction rate for low concentration. For verification, accelerated carbonation test with varying temperature and MIP (Mercury Intrusion Porosimetry) test are carried out, and carbonation depths are compared with those from the previous and the proposed model. Field data with low CO2 concentration is compared with those from the proposed model. The proposed model shows very reasonable results like carbonation depth and consuming Ca(OH)2 through reduced diffusion coefficient and porosity compared with the previous model.
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