Workability and strength of coarse high calcium fly ash geopolymer |
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| Affiliation: | 1. Department of Civil Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;2. CSIRO Manufacturing and Infrastructure Technology, North Ryde 2113, Sydney, Australia;1. University of South Carolina, Dept. of Civil and Environ. Engineering, 300 Main Street, B127, Columbia, SC 29208, USA;2. Holcim (US) Inc., 9624 Bailey Road/Suite 275, Cornelius, NC 28031, USA;3. Wiss, Janney, Elstner Associates, Inc., 330 Pfingsten Road, Northbrook, IL 60062, USA;4. University of South Carolina, Dept. of Civil and Environ. Engineering, 300 Main Street, C206, Columbia, SC 29208, USA;1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;2. Department of Civil and Environmental Engineering, Faculty of Science and Engineering, Kasetsart University, Chalermphrakiat Sakon Nakhon Province Campus, Sakon Nakhon 47000, Thailand;1. School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;2. Department of Civil Engineering, Shanghai Jiao Tong University and State Key Laboratory of Ocean Engineering, 800 Dongchuan Rd, Shanghai 200240, China;3. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, 123 Moo 16 Mittapap Rd., Nai-Muang, Muang District, Khon Kaen 40002, Thailand |
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| Abstract: | In this paper, the basic properties viz., workability and strength of geopolymer mortar made from coarse lignite high calcium fly ash were investigated. The geopolymer was activated with sodium hydroxide (NaOH), sodium silicate and heat. The results revealed that the workable flow of geopolymer mortar was in the range of 110 ± 5%–135 ± 5% and was dependent on the ratio by mass of sodium silicate to NaOH and the concentration of NaOH. The obtained compressive strength was in the range of 10–65 MPa. The optimum sodium silicate to NaOH ratio to produce high strength geopolymer was 0.67–1.0. The concentration variation of NaOH between 10 M and 20 M was found to have a small effect on the strength. The geopolymer samples with high strength were obtained with the following practices: the delay time after moulding and before subjecting the sample to heat was 1 h and the optimum curing temperature in the oven was 75 °C with the curing duration of not less than two days. |
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