Strains under transient hygro-thermal states in concrete loaded in multiaxial compression and heated to 250 °C

Petkovski, M.; Crouch, R.S.

Abstract

Previous experimental research has shown that the compactive strains in concrete subjected to a load-then-heat regime exceed those measured in heat-then-load tests under compression. This excess in strain is known as transient thermal creep or load-induced thermal strain (LITS). All previous experimental research on LITS in mature concrete has been conducted in unsealed conditions, mainly under uniaxial compression (with a few biaxial compression tests, but no multiaxial tests) on specimens subjected to monotonic heating to high temperatures (N500 °C). This paper presents the findings from a novel laboratory investigation of LITS under uniaxial, biaxial and hydrostatic compression in partially sealed conditions, at transient temperatures of up to 250 °C. The results from 49 experiments show that LITS in the sub-250 °C range is highly dependent on the moisture flux conditions and, consequently, on the relationship between heating and drying rates.

Citation

Petkovski, M., & Crouch, R. (2008). Strains under transient hygro-thermal states in concrete loaded in multiaxial compression and heated to 250 °C. Cement and Concrete Research, 38(4), 586-596. https://doi.org/10.1016/j.cemconres.2007.10.008

• Journal Article Type: Article
• Publication Date: Apr 1, 2008
• Deposit Date: Oct 26, 2011
• Journal: Cement and Concrete Research
• Print ISSN: 0008-8846
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 38
• Issue: 4
• Pages: 586-596
• DOI: https://doi.org/10.1016/j.cemconres.2007.10.008
• Keywords: Strain, Transient temperature, Moisture, Multiaxial compression.
• Public URL: https://durham-repository.worktribe.com/output/1552586