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Fracture properties of geopolymer concrete cured in ambient temperature

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Authors
Nath, Pradip
Sarker, Prabir
Date
2013
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Conference Paper

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Nath, Pradip and Sarker, Prabir Kumar. 2013. Fracture properties of geopolymer concrete cured in ambient temperature, in Yazdani, S. and Singh, A. (ed), New Developments in Structural Engineering and Construction, Proceedings of the Seventh International Structural Engineering and Construction Conference, ISEC-7, Jun 18-23 2013, pp. 1061-1066. Manoa, Honolulu: University of Hawaii.
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New Developments in Structural Engineering and Construction
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The Seventh International Structural Engineering and Construction Conference, ISEC-7
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Published with permission: Copyright @ 2013 by Research Publishing Services

NOTICE: This is the author’s version of a work in which changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication.

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Abstract

Geopolymer concrete (GPC) is a promising alternative of ordinary Portland cement (OPC) concrete. Recent studies indicate potential benefit of heat cured geopolymer concrete in structural applications. This study aimed at the fracture behavior of fly ash based geopolymer concrete cured in ambient temperature. Geopolymer concretes were prepared with mainly fly ash as the binder which was activated by a mixture of sodium hydroxide and sodium silicate solutions. Ground granulated blast furnace slag (GGBFS) was added up to 20% of total binder and amount of alkaline solution was varied to determine the effect on concretes subjected to ambient curing. Notched beam specimens were cast and cured in air at 16-22 oC and 70 ± 10% relative humidity. Three-point bending test was conducted using a closed-loop universal testing machine. The fracture energy values were calculated from the load-deflection curves of the test specimens by using the work of fracture method. The critical stress intensity factors of the specimens were also calculated. The load-deflection curves and the fracture behavior of different geopolymer concretes were compared. Generally, the fracture energy varied with the strength of the concrete. The fracture energy of concrete having slag in addition to fly ash was higher than that having only fly ash. Geopolymer concretes achieved higher fracture energy values as compared to OPC concrete of similar compressive strength.