Mechanical Properties and Microstructure of Class C Fly Ash-Based Geopolymer Paste and Mortar |
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| Authors: | Xueying Li Xinwei Ma Shoujie Zhang Enzu Zheng |
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| Institution: | 1.School of Civil Engineering, Harbin Institute of Technology, Harbin 150006, China; E-Mail: ;2.Department of Civil Engineering, Harbin Institute of Technology at WeiHai, Weihai 264209, China;3.Heilongjiang Provincial Hydraulic Research Institute, Harbin 150080, China; E-Mail: |
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| Abstract: | This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145–173 mm for pastes and 131–136 mm for mortars. The highest strengths of paste and mortar were 58 MPa and 85 MPa when they were cured at 70 °C for 24 h. In XRD patterns, unreacted quartz and some reacted product were observed. SEM examination indicated that reacted product has formed and covered the unreacted particles in the paste and mortar that were consistent with their high strength. |
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| Keywords: | geopolymer class C fly ash compressive strength workability microstructure |
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