Advances in concrete construction

  • 제11권4호
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  • Pages.307-314
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  • 2021
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  • 2287-5301(pISSN)
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  • 2287-531X(eISSN)
테크노프레스 (Techno-Press)
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Durability and mechanical performance in activated hwangtoh-based composite for NOx reduction

  • Kim, Hyeok-Jung (Industry Academic Cooperation Foundation, Hankyong National University) ;
  • Park, Jang-Hyun (Korea Institute of Future Convergence Technology, Hankyong National University) ;
  • Yoon, Yong-Sik (Department of Civil and Environmental Engineering, Hannam University) ;
  • Kwon, Seung-Jun (Department of Civil and Environmental Engineering, Hannam University)
  • 투고 : 2020.05.22
  • 심사 : 2021.03.10
  • 발행 : 2021.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

참고문헌

  1. Bentz, D.P., Ehlen, M.A., Ferraris, C.F. and Winpigler, J.A. (2002), "Service life prediction based on sorptivity for highway concrete exposed to sulfate attack and freeze-thaw conditions", Report No. FHWA-RD-01-162, NIST.
  2. Caputo, D., Liguori, B. and Colella, C. (2008), "Some advances in understanding the pozzolanic activity of zeolites: the effect of zeolite structure", Cement Concrete Compos., 30(5), 455-462. https://doi.org/10.1016/j.cemconcomp.2007.08.004.
  3. Diamanti, M.V., Paolini, R., Rossini, M., Aslan, A.B., Zinzi, M., Poli, T. and Pedeferri, M.P. (2015), "Long term self-cleaning and photocatalytic performance of anatase added mortars exposed to the urban environment", Constr. Build. Mater., 96, 270-278. https://doi.org/10.1016/j.conbuildmat.2015.08.028.
  4. Drzaj, B., Hocevar, S., Slokan, M. and Zajc, A. (1978), "Kinetics and mechanism of reaction in the zeolitic tuff-CaO-H2O systems at increased temperature", Cement Concrete Res., 8(6), 711-720. https://doi.org/10.1016/0008-8846(78)90080-7.
  5. Fraay, A.L.A., Bijen, J.M. and De Haan, Y.M. (1989), "The reaction of fly ash in concrete. A critical examination", Cement Concrete Res., 19(2), 235-246. https://doi.org/10.1016/0008-8846(89)90088-4.
  6. Frias, M., De Rojas, M.S. and Cabrera, J. (2000), "The effect that the pozzolanic reaction of metakaolin has on the heat evolution in metakaolin-cement mortars", Cement Concrete Res., 30(2), 209-216. https://doi.org/10.1016/S0008-8846(99)00231-8.
  7. Go, S.S., Lee, H.C., Lee, J.Y., Kim, J.H. and Chung, C.W. (2009), "Experimental investigation of mortars using activated Hwangtoh", Constr. Build. Mater., 23, 1438-1445. https://doi.org/10.1016/j.conbuildmat.2008.07.007.
  8. Hug, H.T., Mayer, A. and Hartenstein, A. (1993), "Off-highway exhaust gas after-treatment: Combining urea-SCR, oxidation catalysis and traps", SAE Technical Paper Series-930363, 1-5.
  9. Kim, H.J., Yoon, Y.S., Yang, K.H. and Kwon, S.J. (2019), "Durability and purification performance of concrete impregnated with silicate and sprayed with photocatalytic TiO2", Constr. Build. Mater., 199, 106-114. https://doi.org/10.1016/j.conbuildmat.2008.07.007.
  10. Kim, S.B., Yi, N.H., Kim, H.Y., Phan, D.H. and Kim, J.H. (2008), "Flexural Behavior of Reinforced Concrete Beams mixed with Hwang-toh", Proc. Korea. Concr. Inst. Conf., Korea Concrete Institute, Seoul, Korea.
  11. Koebel, M., Elsener, M. and Marti, T. (1996), "NOx-reduction in diesel exhaust gas with urea and selective catalytic reduction", Combust. Sci. Technol., 121, 85-102. https://doi.org/10.1016/j.conbuildmat.2008.07.007.
  12. Koo, B.M., Kim, J.H.J., Kim, B.S. and Mun, S.H. (2014), "Material and structural performance evaluations of hwangtoh admixtures and recycled PET fiber-added eco-friendly concrete for CO2 emission reduction", Mater., 7(8), 5959-5981. https://doi.org/10.3390/ma7085959.
  13. Koo, B.M., Kim, J.H.J., Kim, T.K. and Kim, B.Y. (2015), "Material performance and animal clinical studies on performance-optimized hwangtoh mixed mortar and concrete to evaluate their mechanical properties and health benefits", Mater., 8(9), 6257-6276. https://doi.org/10.3390/ma8095306.
  14. Kwon, S.J., Lim, H.S., Kim, H.J. and Hyun, J.H. (2019), "Evaluation of mechanical properties of mortar mixed with zeolites and active hwangtoh", J. Recycl. Constr. Resour. Inst., 7(4), 405-412. https://doi.org/10.14190/JRCR.2019.7.4.405.
  15. Lee, H.S. and Wang, X.Y. (2016), "Evaluation of the carbon dioxide uptake of slag-blended concrete structures, considering the effect of carbonation", Sustain., 8(4), 312-330. https://doi.org/10.3390/su8040312.
  16. Mehta, P.K. (2001), "Reducing the environmental impact of concrete", Concrete Int., 23(10), 61-66.
  17. Muthulingam, S. and Rao, B.N. (2016), "Chloride binding and time-dependent surface chloride content models for fly ash", Front. Struct. Civil Eng., 10(1), 112-120. https://doi.org/10.1007/s11709-015-0322-x.
  18. Perraki, T., Kakali, G. and Kontoleon, F. (2003), "The effect of natural zeolites on the early hydration of Portland cement", Microporous Mesoporous Mater., 61, 205-212. https://doi.org/10.1016/S1387-1811(03)00369-X.
  19. Urhan, S. (1987), "Alkali silica and pozzolanic reactions in concrete. Part 1: Interpretation of published results and an hypothesis concerning the mechanism", Cement Concrete Res., 17(1), 141-152. https://doi.org/10.1016/S1387-1811(03)00369-X.
  20. Wang, X.Y. and Luan, Y. (2018), "Modeling of hydration, strength development, and optimum combinations of cementslag limestone ternary concrete", Int. J. Concrete Struct. Mater., 12(1), 1-13. https://doi.org/10.1016/S1387-1811(03)00369-X.
  21. Yang, I.H., Yoon, Y.S. and Kwon, S.J. (2020), "Chloride penetration in anchorage concrete of suspension bridge during construction stage", Adv. Concrete Constr., 10(1), 13-20. https://doi.org/10.12989/acc.2020.10.1.013.
  22. Yang, K.H., Hwang, H.Z., Kim, S.Y. and Song, J.K. (2007), "Development of a cementless mortar using hwangtoh binder", Build. Environ., 42, 3717-3725. https://doi.org/10.1016/j.buildenv.2006.09.006.
  23. Yoon, Y.S., Yang, K.H. and Kwon, S.J. (2020), "Service life of GGBFS concrete under carbonation through probabilistic method considering cold joint and tensile stress", J. Build. Eng., 32, 1-10. https://doi.org/10.1016/j.jobe.2020.101826.