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Carbonation behavior of aged alkali-activated fly ash/slag binder modified by MgO with different reactivities

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Abstract

This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation behavior of the synthesized binders were explored. A 0.3% CO2 concentration was adopted for an accelerated carbonation environment. The samples were characterized using compressive strength tests, X-ray diffraction, thermogravimetry, 27Al solid-state magic angle spinning nuclear magnetic resonance spectroscopy, and scanning electron microscopy with energy-dispersive spectroscopy. Notably, the compressive strengths of all the samples significantly increased after 28 days of carbonation. Moreover, aragonite was identified as the major carbonation product formed in all samples; nevertheless, its precipitation was scarcely affected by the degree of MgO reactivity. In particular, carbonation results in the decalcification of calcium silicate hydrate gels and the formation of layered double hydroxides. The results illustrate that the sample with relatively higher MgO reactivity exhibits improved carbonation durability.

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Acknowledgements

This study was supported by the National Research Foundation of Korea (NRF), South Korea, grant funded by the Korean government (Ministry of Science and ICT) (No. 2021R1A2C3006382). NMR data were acquired using a 400MHz Solid State NMR spectrometer (AVANCE III HD, Bruker, Germany) at the KBSI Western Seoul Center.

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Authors and Affiliations

  1. Key Laboratory of Building Structural Retrofitting & Underground Space Engineering, Ministry of Education, Shandong Jianzhu University, **an, 250101, China

    Z. Wang

  2. School of Civil Engineering, Shandong Jianzhu University, **an, 250101, China

    Z. Wang

  3. Department of Civil Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, 48513, Busan, South Korea

    Solmoi Park

  4. Civil and Environmental Engineering Department, King Fahd University of Petroleum & Minerals, 31261, Dhahran, Saudi Arabia

    H. R. Khalid

  5. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, 34141, Daejeon, South Korea

    Seonhyeok Kim & H. K. Lee

  6. Interdisciplinary Research Center for Construction and Building Materials, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia

    H. R. Khalid

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Wang, Z., Park, S., Khalid, H.R. et al. Carbonation behavior of aged alkali-activated fly ash/slag binder modified by MgO with different reactivities. Mater Struct 57, 119 (2024). https://doi.org/10.1617/s11527-024-02397-9

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