Residual compressive behavior of alkali-activated concrete exposed to elevated temperatures

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Guerrieri, Maurice, Sanjayan, J and Collins, F (2009) Residual compressive behavior of alkali-activated concrete exposed to elevated temperatures. Fire and Materials, 33 (1). pp. 51-62. ISSN 0308-0501

Abstract

This paper reports the effect of elevated temperature exposures, up to 1200◦C, on the residual compressive strengths of alkali-activated slag concrete (AASC) activated by sodium silicate and hydrated lime; such temperatures can occur in a fire. The strength performance of AASC in the temperature range of 400–800◦C was similar to ordinary Portland cement concrete and blended slag cement concrete, despite the finding that the AASC did not contain Ca(OH)2, which contributes to the strength deterioration at elevated temperatures for Ordinary Portland Cement and blended slag cement concretes. Dilatometry studies showed that the alkali-activated slag (AAS) paste had significantly higher thermal shrinkage than the other pastes while the basalt aggregate gradually expanded. This led to a higher thermal incompatibility between the AAS paste and aggregate compared with the other concretes. This is likely to be the governing factor behind the strength loss of AASC at elevated temperatures.

Item type Article
URI http://vuir.vu.edu.au/id/eprint/3693
Identification Number https://doi.org/10.1002/fam.983
Official URL http://dx.doi.org/10.1002/fam.983
Subjects Current > FOR Classification > 0905 Civil Engineering
Current > FOR Classification > 0915 Interdisciplinary Engineering
Historical > Faculty/School/Research Centre/Department > Centre for Environmental Safety and Risk Engineering (CESARE)
Keywords ResPubID16578, alkali-activated slag concrete, concrete, dilatometer, residual strength, thermal incompatibility, thermogravimetric analysis
Citations in Scopus 37 - View on Scopus
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