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Behavior of combined fly ash/slag-based geopolymers when exposed to high temperatures

Guerrieri, Maurice and Sanjayan, Jay G (2009) Behavior of combined fly ash/slag-based geopolymers when exposed to high temperatures. Fire and Materials, 34 (4). pp. 163-175. ISSN 0308-0501

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Abstract

The high temperature performance up to 800◦C of combined fly ash (FA) and slag geopolymers at the ratio of 100, 65/35, 50/50, 35/65 and 100% (wt-%) is presented in this paper. Geopolymers are alternative novel binders to conventional Portland cement and are generally believed to provide superior fire resistant properties due to their ceramic-like characteristics. This paper presents new data on the behavior of geopolymers made with combined FA/slag mentioned previously, which were mixed with alkaline materials with molecular silicate modulus (Ms=SiO2/Na2O) of 0, 0.5, 1.0, 1.5 and 2.0 with sodium (Na) dosages of 4 and 8 (wt-%). Altogether 60 mixes were made yielding compressive strengths between 3 and 83MPa. Behavior of the material to high temperatures was investigated by exposing the specimens to 800◦C and testing for compressive strengths. It was found that as the initial strength increases, the residual strength exponentially decreased. The compressive stress versus strain relationships showed that the ductility of the specimens decreased as the initial strength increased. The ability of the materials with high ductility (i.e. less brittleness) to accommodate thermal incompatibilities arising from uneven temperatures arising during heating is concluded to be the major factor contributing to the reduced strength losses.

Item Type: Article
Uncontrolled Keywords: ResPubID16579. alkali-activated slag, ductility, high temperatures, slag, geopolymers, fly ash, residual strength, fire resistant materials, construction materials, cement
Subjects: FOR Classification > 0912 Materials Engineering
Faculty/School/Research Centre/Department > Centre for Environmental Safety and Risk Engineering (CESARE)
Funders: http://purl.org/au-research/grants/arc/DP0558463
Depositing User: VUIR
Date Deposited: 17 Oct 2011 02:26
Last Modified: 15 Jan 2015 04:56
URI: http://vuir.vu.edu.au/id/eprint/4317
DOI: 10.1002/fam.1014
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Citations in Scopus: 4 - View on Scopus

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