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Title |
Evaluation of the Physical Properties of Ternary Concrete Containing Fly Ash and Blast Furnace Slag at Five Years of Age
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Authors |
이빛나(Binna Lee) ; 이종석(Jong Suk Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2025.37.6.787 |
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Keywords |
삼성분계 콘크리트; 압축강도; 탄산화; 공극률; 장기 재령 ternary blended concrete; compressive strength; carbonation; porosity; long-term |
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Abstract |
The cement industry plays a critical role in achieving carbon neutrality by 2050, with clinker reduction and the use of supplementary cementitious materials (SCMs) recognized as effective strategies. While international standards have established regulations for multi-component cements based on the type and proportion of SCMs, fundamental data for establishing Korean KS standards are remain limited. In this study, four types of ternary blended concrete were prepared using ordinary Portland cement (Type I), fly ash, and blast furnace slag, with SCM replacement levels of 30 %, 40 %, and 50 % by mass of cement. The specimens were exposed in an outdoor exposure site for five years, and compressive strength, carbonation depth, and porosity were evaluated. The analysis showed that compressive strength decreased with increasing SCM replacement ratios. Although the strength difference diminished at long-term ages, it remained lower than that of the reference OPC specimen. Carbonation depth increased with higher SCM replacement ratios, but, the carbonation rate tended to slow from one year of age. Analysis of the five-year porosity indicated similar values across all specimens, regardless of the SCM content.
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