Dludlu, MKOboirien, BilainuSadiku, R2017-09-042017-09-042017Dludlu, M.K., Oboirien, B., and Sadiku, R. 2017. Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa. Energy and Fuels, vol. 31: 1712-1722. DOI: 10.1021/acs.energyfuels.6b024540887-0624DOI: 10.1021/acs.energyfuels.6b02454http://pubs.acs.org/doi/abs/10.1021/acs.energyfuels.6b02454?src=recsyshttp://hdl.handle.net/10204/9525Copyright: 2017 American Chemical Society. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, kindly consult the publisher's website.In this study, coal fly ashes (CFAs) from three different boiler sites in South Africa, Eskom (E coal fly ash), George Mukhari Academic Hospital (GMH coal fly ash), and KarboChem (KBC coal fly ash), were used to produce geopolymers. The coal fly ashes were pretreated with a mixed alkali activator solution of sodium silicate (NaSiO3) and sodium hydroxide (NaOH). The geopolymer pastes were cured in an oven at 60 °C for 10 days and further cured at room temperature for 18 days. The microstructure and mechanical properties of the geopolymers were evaluated by scanning electron microscopy energy dispersive spectroscopy (SEM-EDS), X-ray diffractions (XRD), Fourier transform infrared (FTIR), thermogravimetric (TG), and compressive strength analyses. The compressive test results obtained showed that the E and KBC geopolymers have higher strength than GMH-CFA geopolymers. Similar results were obtained in the FTIR and SEM-EDS analyses. This indicates that E-CFA and KBC-CFA are more reactive and hence they have a higher degree of geopolymerization when compared to GMH-CFA.enGeopolymerCoal Fly AshCFACharacterizationAlkali-Activator SolutionAluminosilicateMicostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South AfricaArticleDludlu, M., Oboirien, B., & Sadiku, R. (2017). Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa. http://hdl.handle.net/10204/9525Dludlu, MK, Bilainu Oboirien, and R Sadiku "Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa." (2017) http://hdl.handle.net/10204/9525Dludlu M, Oboirien B, Sadiku R. Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa. 2017; http://hdl.handle.net/10204/9525.TY - Article AU - Dludlu, MK AU - Oboirien, Bilainu AU - Sadiku, R AB - In this study, coal fly ashes (CFAs) from three different boiler sites in South Africa, Eskom (E coal fly ash), George Mukhari Academic Hospital (GMH coal fly ash), and KarboChem (KBC coal fly ash), were used to produce geopolymers. The coal fly ashes were pretreated with a mixed alkali activator solution of sodium silicate (NaSiO3) and sodium hydroxide (NaOH). The geopolymer pastes were cured in an oven at 60 °C for 10 days and further cured at room temperature for 18 days. The microstructure and mechanical properties of the geopolymers were evaluated by scanning electron microscopy energy dispersive spectroscopy (SEM-EDS), X-ray diffractions (XRD), Fourier transform infrared (FTIR), thermogravimetric (TG), and compressive strength analyses. The compressive test results obtained showed that the E and KBC geopolymers have higher strength than GMH-CFA geopolymers. Similar results were obtained in the FTIR and SEM-EDS analyses. This indicates that E-CFA and KBC-CFA are more reactive and hence they have a higher degree of geopolymerization when compared to GMH-CFA. DA - 2017 DB - ResearchSpace DP - CSIR KW - Geopolymer KW - Coal Fly Ash KW - CFA KW - Characterization KW - Alkali-Activator Solution KW - Aluminosilicate LK - https://researchspace.csir.co.za PY - 2017 SM - 0887-0624 T1 - Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa TI - Micostructural and mechanical properties of geopolymers synthesised from three coal fly ashes from South Africa UR - http://hdl.handle.net/10204/9525 ER -