Thermal Effects on Compressive Strength of Local Limestone and Claystone

Rahel K. Ibrahim; Nawzat R. Ismail; Hemn M. Omar

doi:10.14500/aro.10283

Rahel K. Ibrahim Department of Civil Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region http://orcid.org/0000-0002-1242-747X
Nawzat R. Ismail Department of Geotechnical Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region http://orcid.org/0000-0002-8639-5175
Hemn M. Omar Department of Geotechnical Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region http://orcid.org/0000-0002-8416-9131

Keywords: Compressive strength, Claystone, Limestone, Kurdistan Region, Thermal effects

Abstract

Limestone and claystone are widely used in rocky mountainous areas as building materials in Kurdistan region, in particular, the city of Koya. The outbreak of fire in buildings will have a great impact on strengths of building materials. The property performance of these local materials is heavenly understudied. This research investigates the impact of high temperature on the physicomechanical properties of limestone and claystone from Fatha Formation in Koya in Kurdistan region of Iraq. For this purpose, cores were taken from intact rocks; their ends were cut by a mechanical saw to obtain a cylindrical shape and immersed in water for 24 h, and then, subjected to physicomechanical tests of specific gravity, water absorption, porosity, and uniaxial compressive strength. For determining the residual compressive strength, the specimens were taken out from water, surface dried, and exposed to high temperatures of 450, and 650°C for 2 h using an electric oven. The results showed that claystone specimens show more stable mechanical properties than the limestone after exposure to high temperatures, and the high temperature causes lightening in color and significant cracks in both materials.

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Author Biographies

Rahel K. Ibrahim, Department of Civil Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region

Rahel Khalid Ibrahim was born in Erbil/ Iraqi Kurdistan in 1973. He got his; B.Sc. degree from the Department of Civil Engineering, Salahaddin University in 1996, M.Sc. degree from the Department of Civil Engineering, EGE University Izmir, Turkey in 2001 and Ph.D. degree from the Department of Civil and Structural Engineering, University Kebangsaan Malaysia in 2013. Currently he is the Director of Research Center and Lecturer at the Department of Civil Engineering, Faculty of Engineering, Koya University. [see TAP]

Nawzat R. Ismail, Department of Geotechnical Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region

Nawzat R. Ismail is a Lecturer at the Department of Geotechnical Engineering, Koya University since 2004. He has a B.Sc., M.Sc. and Ph.D. degrees in Sedimentology and Stratigraphical Geology from Mosul University, Iraq. Nawzat's main research interests have been in the Sedimentology & Stratigraphy of Cenozoic Era of formations (rock units) for Kurdistan region and Suitability in Engineering Projects. [see TAP]

Hemn M. Omar, Department of Geotechnical Engineering, Faculty of Engineering, Koya University, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region

Hemn M. Omar is a Lecturer at the Department of Geotechnical Engineering, Koya University since 2004. He has a B.Sc. degree in Geology and M.Sc. degree in Geotechnical Engineering. His main research area is Geotechnical Investigation and Engineering Geological Assessment. Mr. Hemn is a Consultant at the Kurdistan Geological Union. [See TAP]

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