Workability and strength of coarse high calcium fly ash geopolymer
Source abstract
Abstract
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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Research context
OpenAlex topics: Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production · Magnesium Oxide Properties and Applications
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References (15)
Show source-provided references
1. Introduction: sustainable development and concrete technology
2. Davidovits J. Chemistry of geopolymeric systems, terminology. In: Davidovits J, Davidovits R, James C. (Eds.) Geopolymer ’99 international conference, France; 1999. p. 9–40.
3. Alkali-activated fly ashes, a cement for the future10.1016/S0008-8846(98)00243-9 ↗
4. On the development of fly ash – based geopolymer concrete
5. Utilisation of fly ash in a geopolymeric material10.1016/S0883-2927(02)00005-7 ↗
6. Geopolymeric materials prepared using class F fly ash and elevated temperature curing10.1016/j.cemconres.2004.06.031 ↗
7. Microstructure development of alkali-activated fly ash cement: a descriptive model10.1016/j.cemconres.2004.08.021 ↗
8. Geopolymer room temperature ceramic matrix for composites
9. Palomo A, Macias A, Blanco MT, Puertas F. Physical, chemical and mechanical characterization of geopolymers. In: Proceedings of the 9th International Congress on the Chem of Cem; 1992. p. 505–11.
10. American Society for Testing and Materials. ASTM C494/C494M-99a: Standard specification for chemical admixtures for concrete, Annual book of ASTM standards, Philadelphia; 04.02, 2001. p. 261–9.
11. American Society for Testing and Materials. ASTM C124-71: Standard test method for flow of Portland cement concrete by use of the flow table, Annual book of ASTM standards, Part 10, Philadelphia; 1973. p.75–7.
12. American Society for Testing and Materials. ASTM C109/C109M-99: Standard test method for compressive strength of hydraulic cement mortars (Using 2-in or [50mm] cube specimens), Annual book of ASTM Standards, Philadelphia; 04.01, 2001. p. 83–8.
13. Hydrothermal processing of new fly ash cement
14. The effect of composition and temperature on the properties of fly ash and kaolinite-based geopolymer10.1016/S1385-8947(02)00025-6 ↗
15. Properties of geopolymer cements