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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29524


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8467
Effect of Curing Conditions on Strength of Fly ash-based Self-Compacting Geopolymer Concrete
Abstract:
This paper reports the results of an experimental work conducted to investigate the effect of curing conditions on the compressive strength of self-compacting geopolymer concrete prepared by using fly ash as base material and combination of sodium hydroxide and sodium silicate as alkaline activator. The experiments were conducted by varying the curing time and curing temperature in the range of 24-96 hours and 60-90°C respectively. The essential workability properties of freshly prepared Self-compacting Geopolymer concrete such as filling ability, passing ability and segregation resistance were evaluated by using Slump flow, V-funnel, L-box and J-ring test methods. The fundamental requirements of high flowability and resistance to segregation as specified by guidelines on Self-compacting Concrete by EFNARC were satisfied. Test results indicate that longer curing time and curing the concrete specimens at higher temperatures result in higher compressive strength. There was increase in compressive strength with the increase in curing time; however increase in compressive strength after 48 hours was not significant. Concrete specimens cured at 70°C produced the highest compressive strength as compared to specimens cured at 60°C, 80°C and 90°C.
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References:

[1] D. Hardjito, and B. V. Rangan, "Development and Properties of Low- Calcium Fly ash based Geopolymer Concrete", Research report GC-1, Faculty of Engineering, Curtin University of Technology, Perth, Australia, 2005.
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[9] Xiaolu Guo, Huisheng Shi, Warren A. Dick, "Compressive strength and microstructural characteristics of class C fly ash geopolymer", Cement & Concrete Composites, 32 (2010), pp. 142-147.
[10] P. Rovnanik, "Effect of curing temperature on the development of hard structure of metakaolin-based geopolymer", Construction and Building Materials, 24 (2010), pp. 1176-1183.
[11] EFNARC, "Specification and Guidelines for Self-Compacting Concrete", February 2002.
[12] K. Komnitas, D. Zaharaki, "Geopolymerisation: a review and prospects for the minerals industry", Mineral Engineering, 20 (2007), pp. 1261- 1277.
[13] D. Hardjito, S. E. Wallah, D. M. J. Sumajouw, and B. V. Rangan, "Factors Influencing the Compressive Strength of Fly ash-Based Geopolymer Concrete", Civil Engineering Dimension, Vol. 6, No. 2, 88-93, September 2004, ISSN 1410-9530.
[14] Djwantoro Hardjito, Chua Chung Cheak, and Carrie Ho Lee Ing, "Strength and Setting Times of Low Calcium Fly Ash-based Geopolymer Mortar", Modern Applied Science, 2 (4): 2008, pp. 3-11.
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