Citation

Nassif A. Fire Mater. 2006; 30(5): 323-332.

Affiliation

Department of Civil Engineering, University of Portsmouth, Lion Gate Building, Lion Terrace, Portsmouth, Hampshire PO1 3HF, U.K

Copyright

(Copyright © 2006, John Wiley and Sons)

DOI

10.1002/fam.911

PMID

unavailable

Abstract

This paper reports experimental data establishing the postfire full stress-strain response of fire-affected concrete. Such data are useful in situations when redesign of fire-damaged concrete elements is considered.Heating was carried out to various temperatures in the range 217-470 degrees C. Cooling was carried out either by quenching or in air. The postfire strain at ultimate stress significantly increased after heating to temperatures higher than 320 degrees C. Quenching seems to aggravate the loss in compressive strength and further increase the strain at ultimate stress. Quenching involved spraying the heated concrete with tap water for 5 min. It is evident that knowledge of maximum temperature of exposure alone is not sufficient for estimation of the postfire stress-strain relationship. Other characteristics of exposure such as method of cooling are also important in evaluating the modification in the structural behaviour of fire-affected concrete.