Thermal effects on the mechanical properties of marble, travertine and concrete cores under direct tensile test

Document Type : Research Article

Authors

1 M.Sc., Amirkabir University of Technology, Department of Civil & Enviromental Engineering

2 Professor, Amirkabir University of Technology, Department of Civil & Enviromental Engineering

3 Ph.D candidate, Amirkabir University of Technology, Department of Civil & Enviromental Engineering

Abstract

Fire and high temperatures are the most destructive accidental loads that a structure can be subjected to. There are numerous kinds of research concentrated on the effect of high temperature on physical and mechanical properties of rocks and concrete while there are a few inadequate investigations on marble and limestones. To study the physical and mechanical properties of rocks and concretes after treatment at different temperatures several UCS and DTS conducted. This work presents direct tensile tests results obtained under high temperatures on marble, travertine and concrete samples, previously heated at a namely temperature (350°C), were tested. Destructive tests of direct tensile tests and uniaxial compressive tests were performed on the samples. Furthermore, tests were carried out under air-cooled conditions to minimize the effect of the fire-off method and then physio-mechanical properties of thermally treated, and the reference samples at room temperature were discovered. The results show that direct tensile strength, and tensile modulus decrease as the temperature rises for the tested range of temperatures. A decrease of the direct tensile strength up to 44%, 45%, 16.71% is perceived in air cooled for Marble, travertine, and concrete samples respectively when the samples are heated to 350°C. Regarding Young’s modulus, a fall over 42% and 22% and 33% in air-cooled is observed.

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