Fire-resistant geopolymer bricks synthesized from high-calcium fly ash with outdoor heat exposure |
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| Authors: | Prinya Chindaprasirt Ubolluk Rattanasak |
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| Affiliation: | 1.Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering,Khon Kaen University,Khon Kaen,Thailand;2.Office of the Royal Society,The Royal Society of Thailand,Dusit, Bangkok,Thailand;3.Department of Chemistry, Faculty of Science,Burapha University,Chonburi,Thailand |
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| Abstract: | This research proposed an alternative utilization of high-calcium fly ash to produce geopolymer bricks for fire-resistant applications. Outdoor heat exposure (OHE) was applied to cure geopolymer mortar. The temperature was up to 40 °C. Geopolymer brick was created with a 30-day compressive strength of 47 MPa via OHE curing for 3 days. The brick experienced a low weight loss after the firing test, which indicated its fire-resistant property. For the flame test, the maximum temperature on the opposite side of the brick from the flame was lower than 380 °C, with no observable cracks, complying with the fire-test requirement. Therefore, high-calcium fly ash geopolymer cured with OHE is suitable for use as a fire-resistant material. In addition, outdoor heat exposure is a promising renewable means to cure geopolymer. |
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