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Advances in Concrete Construction Volume 11, Number 4, April 2021 , pages 307-314 DOI: https://doi.org/10.12989/acc.2021.11.4.307 |
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Durability and mechanical performance in activated hwangtoh -based composite for NOx reduction |
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Hyeok-Jung Kim, Jang-Hyun Park, Yong-Sik Yoon and Seung-Jun Kwon
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| Abstract | ||
| Activated hwangtoh (ACT) is a natural resource abundant in South Korea, approximately 15.0% of soil. It is an efficient mineral admixture that has activated pozzolanic properties through high-temperature heating and rapid cooling. The purpose of this study is to improve a curb mixture that can reduce NOx outside and investigate durability performance. To this end, mortar curb specimens were manufactured by replacing OPC with ACT. The ACT substitution ratios of 0.0, 10.0, and 25.0% were considered, and mechanical and durability tests on the curb specimens were conducted at 28 and 91 days of age. Steam curing was carried out for three days for the production of curbs, which was very effective to strength development at early ages. The reduction in strength at early ages could be compensated through this process, and no significant performance degradation was evaluated in the tests on chloride attack, carbonation, and freezing and thawing. The mortar curb with an ACT of 10.0~25.0% replacement ratio exhibited clear NOx reduction through photocatalytic (TiO2) treatment. This is due to the increase in physical absorption through surface absorption and the photocatalyst-containing TiO2 coating. In this study, the reasonable range of the ACT replacement ratio for NOx reduction was quantitatively evaluated through a comprehensive analysis of each test. | ||
| Key Words | ||
| Activated Hwangtoh (ACT); chloride attack; freezing and thawing; carbonation; curb; NOx reduction | ||
| Address | ||
| Hyeok-Jung Kim: Industry Academic Cooperation Foundation, Hankyong National University, 327 Jangang-ro, Anseong, 17579, South Korea Jang-Hyun Park: Korea Institute of Future Convergence Technology, Hankyong National University, 327 Jangang-ro, Anseong, 17579, South Korea Yong-Sik Yoon: Department of Civil and Environmental Engineering, Hannam University, 70 Hannam-ro, Daedeok-gu, Daejeon, 34430, South Korea -Jun Kwon: Department of Civil and Environmental Engineering, Hannam University, 70 Hannam-ro, Daedeok-gu, Daejeon, 34430, South Korea | ||
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