The effects of ground granulated blast-furnace slag blending with fly ash and activator content on the workability and strength properties of geopolymer concrete cured at ambient temperature |
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| Affiliation: | 1. Program in Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand;2. Mie Prefecture Industrial Research Institute, Mie 514-0819, Japan;3. Dept. of Architecture, Faculty of Engineering, Mie University, Mie 514-8504, Japan;4. Sustainable Infrastructure Research and Development Center, Dept. of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;1. School of Infrastructure, Indian Institute of Technology, Bhubaneswar, Odisha 751013, India;2. National Aluminium Company Limited (NALCO), Bhubaneswar 751013, India;1. C. S. Patel Institute of Technology, Charotar University of Science and Technology, Changa 388421, India;2. Applied Mechanics Department at VGEC, Chandkheda, India;3. School of Engineering, P. P. Savani University, Kosamba, Surat 394142, India |
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| Abstract: | Inclusion of ground granulated blast-furnace slag (GGBFS) with class F fly-ash can have a significant effect on the setting and strength development of geopolymer binders when cured in ambient temperature. This paper evaluates the effect of different proportions of GGBFS and activator content on the workability and strength properties of fly ash based geopolymer concrete. In this study, GGBFS was added as 0%, 10% and 20% of the total binder with variable activator content (40% and 35%) and sodium silicate to sodium hydroxide ratio (1.5–2.5). Significant increase in strength and some decrease in the workability were observed in geopolymer concretes with higher GGBFS and lower sodium silicate to sodium hydroxide ratio in the mixtures. Similar to OPC concrete, development of tensile strength correlated well with the compressive strength of ambient-cured geopolymer concrete. The predictions of tensile strength from compressive strength of ambient-cured geopolymer concrete using the ACI 318 and AS 3600 codes tend to be similar to that for OPC concrete. The predictions are more conservative for heat-cured geopolymer concrete than for ambient-cured geopolymer concrete. |
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| Keywords: | Ambient curing Geopolymer Ground granulated blast-furnace slag Fly ash Tensile strength Workability |
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