Fly Ash-Based Geopolymer Building Materials for Green and Sustainable Development
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Department of Chemical Engineering, Cape Peninsula University of Technology, P.O. Box 1906, Bellville, Cape Town, Western Cape 7535, South Africa
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Department of Civil and Mechanical Engineering, University of Missouri-Kansas City, 5110 Rockhill, Kansas City, MO 64110, USA
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Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
4
Water and Environment Unit, Council for Geoscience, 280 Pretoria Street, Silverton, Pretoria 0184, South Africa
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Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5699; https://doi.org/10.3390/ma13245699
Received: 27 October 2020
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Revised: 17 November 2020
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Accepted: 23 November 2020
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Published: 14 December 2020
(This article belongs to the Special Issue Advanced Civil Engineering Materials: From Synthesis to Application)
This study reports on formulations and conditions for producing fly ash-based geopolymers with a view to showing that the compressive strength required for construction applications can be obtained without the addition of aggregates, sand, and/or cement. It was shown in a series of experiments constituting at least 73% fly ash that a compressive strength of up to 90 MPa can be obtained depending on the curing conditions. While high alkalinity resulted in stronger materials, the results showed about 40% savings in CO2 emissions without using sand and cement. Such materials are suited for construction applications with minimal environmental impact.
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Keywords:
fly ash; geopolymer; compressive strength; carbon dioxide; construction
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MDPI and ACS Style
Kalombe, R.M.; Ojumu, V.T.; Eze, C.P.; Nyale, S.M.; Kevern, J.; Petrik, L.F. Fly Ash-Based Geopolymer Building Materials for Green and Sustainable Development. Materials 2020, 13, 5699. https://doi.org/10.3390/ma13245699
AMA Style
Kalombe RM, Ojumu VT, Eze CP, Nyale SM, Kevern J, Petrik LF. Fly Ash-Based Geopolymer Building Materials for Green and Sustainable Development. Materials. 2020; 13(24):5699. https://doi.org/10.3390/ma13245699
Chicago/Turabian StyleKalombe, Rosicky M., Victor T. Ojumu, Chuks P. Eze, Sammy M. Nyale, John Kevern, and Leslie F. Petrik. 2020. "Fly Ash-Based Geopolymer Building Materials for Green and Sustainable Development" Materials 13, no. 24: 5699. https://doi.org/10.3390/ma13245699
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