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Processing parameters affecting the nano scale-microstructure and mechanical strength of coal ash-based geopolymer

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Abstract

The coal ash-based geopolymer exhibits many excellent properties such as high compressive strength, low creep, good acid resistance and low shrinkage, so it is emerging as a promising new cement alternative in the field of building and construction materials, In this study, the coal reclamation ash-based geopolymers was fabricated to investigate the optimal processing conditions to enhance the mechanical strength. The processing parameter concerned were the concentration of the alkali activator, liquid/solid ratio and calcination temperature to remove the unburned carbon. Characterization of geopolymers were performing on the phase analysis, nano scale-microstructure observation and measurement of compressive strength of the geopolymers fabricated. The raw material coal reclamation ash had much unburned carbon of 7.5 wt% and is identified as the class F fly ash. The curing temperature for fabricating geopolymer was 70°C/24h. In conclusion, raising the recycling rate of coal reclamation ash and enhancing the mechanical strength of coal reclamation ash-based geopolymer will be tried.

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Kyonggi University, 154-42, Gwanggyosan-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-760, South Korea

    Ji-Hwan Won & Seung-Gu Kang

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  1. Ji-Hwan Won
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  2. Seung-Gu Kang
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Correspondence to Seung-Gu Kang.

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Won, JH., Kang, SG. Processing parameters affecting the nano scale-microstructure and mechanical strength of coal ash-based geopolymer. Int. J. Precis. Eng. Manuf. 16, 1335–1340 (2015). https://doi.org/10.1007/s12541-015-0175-1

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  • DOI: https://doi.org/10.1007/s12541-015-0175-1

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