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Resistance to acid and sulfate solutions of microwave-assisted high calcium fly ash geopolymer

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Abstract

In this paper, 90-W microwave radiation for 5 min plus a shortened heat curing period was applied to cure the fresh geopolymer paste. Results showed that microwave radiation contributed to the dissolution of fly ash in the alkaline solution. Numerous gel formations were observed in microscopic scale. This resulted in a dense composite and strong bonding between the fly ash and the geopolymer matrix leading to high strength gain compared to those of the control pastes cured at 65 °C for 24 h. In addition, resistances to the sulfuric acid and sulfate attacks of the microwave geopolymer were superior to that of the control as indicated by the relatively low strength loss. The microwave radiation also helped the geopolymer attaining thermal stability as the dense matrices were obtained.

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Acknowledgments

The authors gratefully acknowledge the financial support from the Higher Education Research Promotion, and National Research University Project of Thailand, Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University and the Thailand Research Fund (TRF) under TRF Senior Research Scholar contract no. RTA5480004. Appreciation is also extended to the Center for Innovation in Chemistry (PERCH-CIC).

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Authors and Affiliations

  1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand

    Prinya Chindaprasirt

  2. Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi, 20131, Thailand

    Ubolluk Rattanasak & Sompop Taebuanhuad

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  1. Prinya Chindaprasirt
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  2. Ubolluk Rattanasak
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  3. Sompop Taebuanhuad
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Correspondence to Ubolluk Rattanasak.

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Chindaprasirt, P., Rattanasak, U. & Taebuanhuad, S. Resistance to acid and sulfate solutions of microwave-assisted high calcium fly ash geopolymer. Mater Struct 46, 375–381 (2013). https://doi.org/10.1617/s11527-012-9907-1

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  • DOI: https://doi.org/10.1617/s11527-012-9907-1

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