Effects of elevated temperature on physical and mechanical properties of carbonate rocks in South-Southern Nigeria
1Federal University of Technology Akure, Akure, Nigeria
Min. miner. depos. 2018, 12(4):20-27
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Purpose. Limestone and marble are carbonate rocks with several structural and engineering applications. The physical and mechanical properties of the rocks are fundamental as they determine their suitability for various use. Temperature is one of the critical factors that could affect the properties of the rocks and consequently their engineering application. Therefore, a better understanding of how the temperature, especially when it is higher than ambient, will affect the properties of the rocks is essential. In this work, the effects of the elevated temperature on some physical and mechanical properties of the carbonate rocks have been studied.
Methods. Cubic samples of the rocks were prepared and heated in a furnace to different temperatures up to 900°C at an interval of 100°C and then cooled to the room temperature for testing. Porosity, dry density and uniaxial compressive strength (UCS) of the samples were determined under the effect of the elevated temperature. The porosity and dry density were determined using the saturation and buoyancy method while the UCS was estimated from the point load index tests performed on the samples.
Findings. The results of this work indicate that the elevated temperature has significant effects on the physical and mechanical properties of the rocks. The porosity of the rocks showed an increasing trend as the temperature was increased while the density steadily decreased especially at the temperature above 300°C. The UCS of the rocks also declines with increased temperature but with an intermittent increase in their strength at a specific heating temperature.
Originality. Most of the available studies on Nigerian carbonate rocks are focused on the estimation of physical and mechanical properties of the rocks without considering changes in these properties when the rocks are subjected to high temperatures. This study therefore aims to fill the gap by investigating the effects of the elevated temperatures on the physical and mechanical properties of some of the Nigerian carbonate rocks.
Practical implications. The results of this study further increase understanding of the effect of high temperature on carbonate rocks, and also help to identify the critical temperature at which the properties of carbonate rocks undergo significant and irreversible changes. This information is very important for restoration of valuable fire-damaged structures made of carbonate rocks.
Keywords: limestone, marble, elevated temperature, rock properties, heat treatment
Aghamelu, O.P., & Amah, J.I. (2017). Quality and durability of some marble deposits in the southern schist belt (Nigeria) as construction stones. Bulletin of Engineering Geology and the Environment, 76(4), 1563-1575.
Aina, A.E. (2014). Compositional features and economic appraisal of limestone deposit in Ososo, Edo State, South-Western Nigeria. Unpublished M.Sc. Thesis. Ibadan, Nigeria: University of Ibadan.
Akinniyi, A.A., & Ola, S.A. (2016). Investigation of certain engineering properties of some Nigerian limestone deposits for cement production. Electronic Journal of Geotechnical Engineering, (21), 10471-10482.
Akram, M., & Bakar, M.A. (2007). Correlation between uniaxial compressive strength and point load index for salt-range rocks. Pakistan Journal of Engineering and Applied Sciences, (1), 1-7.
Anifowose, Y.B. (1984). An estimation of indirect tensile and compressive strength of Ewekoro Limestone, S.W. Nigeria. Unpublished M.Sc. Thesis. Ibadan, Nigeria: University of Ibadan.
Berger, A., Ebert, A., Ramseyer, K., Gnos, E., & Decrouez, D. (2016). Dolomite microstructures between 390° and 700°C: Indications for deformation mechanisms and grain size evolution. Journal of Structural Geology, (89), 144-152.
Bieniawski, Z.T. (1975). The point-load test in geotechnical practice. Engineering Geology, 9(1), 1-11.
Broch, E., & Franklin, J.A. (1972). The point-load strength test. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 9(6), 669-676.
Brotóns, V., Tomás, R., Ivorra, S., & Alarcón, J.C. (2013). Temperature influence on the physical and mechanical properties of a porous rock: San Julian’s calcarenite. Engineering Geology, (167), 117-127.
Brown, E.T. (1981). Rock characterization testing and monito-ring: ISRM suggested methods. Oxford: Pergamon Press.
Cantisani, E., Pecchioni, E., Fratini, F., Garzonio, C.A., Male-sani, P, & Molli, G. (2009). Thermal stress in the Apuan marbles: Relationship between microstructure and petrophysical characteristics. International Journal of Rock Mechanics and Mining Sciences, 46(1), 128-137.
Elhakim, A.F. (2015). The use of point load test for Dubai weak calcareous sandstones. Journal of Rock Mechanics and Geotechnical Engineering, 7(4), 452-457.
Esu, E.O., Edet, A.E., Teme, S.C., & Okereke, C.S. (1994). A study of some Nigerian carbonate rocks for the building construction industry. Engineering Geology, 37(3-4), 271-283.
Ferrero, A.M., & Marini, P. (2001). Experimental studies on the mechanical behaviour of two thermal cracked marbles. Rock Mechanics and Rock Engineering, 34(1), 57-66.
Ferrero, A.M., Migliazza, M., Spagnoli, A., & Zucali, M. (2014). Micromechanics of intergranular cracking due to anisotropic thermal expansion in calcite marbles. Enginee-ring Fracture Mechanics, (130), 42-52.
González-Gómez, W.S., Quintana, P., May-Pat, A., Avilés, F., May-Crespo, J., & Alvarado-Gil, J.J. (2015). Thermal effects on the physical properties of limestones from the Yucatan Peninsula. International Journal of Rock Mechanics and Mining Sciences, (75), 182-189.
Heuze, F.E. (1983). High-temperature mechanical, physical and Thermal properties of granitic rocks – A review. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 20(1), 3-10.
Kim, G.M., Kim, D.H., Kang, J.S., Kang, S.S., & Baek, H. (2012). A study on the correlation between uniaxial compressive strength and point load strength index of lime-stone of Imgye area. Journal of Korean Society for Rock Mecha-nics, 22(5), 330-338.
Martin, R.J., Noel, J.S., Boyd, P.J., & Price, R.H. (1996). Thermal expansion as a function of confining pressure for welded tuff from Yucca Mountain. In Proceedings of the 2nd North American Rock Mechanics Symposium (pp. 1-8). Montreal, Quebec, Canada: American Rock Mechanics Association.
Nasseri, M.H.B., Schubnel, A., & Young, R.P. (2007). Coupled evolutions of fracture toughness and elastic wave velocities at high crack density in thermally treated Westerly granite. International Journal of Rock Mechanics and Mining Sciences, 44(4), 601-616.
Obasi, R.A. (2012). Geochemistry and appraisal of the economic potentials of Calc-gneiss and marble from Igarra, Edo State, Southwest Nigeria. ARPN Journal of Science and Techno-logy, (2), 1018-1021.
Peng, J., Rong, G., Cai, M., Yao, M.-D., & Zhou, C.-B. (2016). Physical and mechanical behaviors of a thermal-damaged coarse marble under uniaxial compression. Engineering Geology, (200), 88-93.
Salah, H., Omar, M., & Shanableh, A. (2014). Estimating unconfined compressive strength of sedimentary rocks in United Arab Emirates from point load strength index. Journal of Applied Mathematics and Physics, 02(06), 296-303.
Saliu, M.A., Akindoyeni, A.F., & Okewale, I.A. (2013). Correlation between blast efficiency and uniaxial compressive strength. International Journal of Engineering and Techno-logy, (3), 799-805.
Shafiei, A., & Dusseault, M.B. (2012). Viscous oil carbonates at elevated temperature. In Proceedings of the 46th US Rock Mechanics/Geomechanics Symposium (pp. 1-12). Chicago, Illinois, United States: American Rock Mechanics Association.
Sirdesai, N.N., Singh, T.N., Ranjith, P.G., & Singh, R. (2017). Effect of varied durations of thermal treatment on the tensile strength of red sandstone. Rock Mechanics and Rock Engineering, 50(1), 205-213.
Ulusay, R., & Hudson, J.A. (2007). The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974-2006. Ankara, Turkey: International Society for Rock Mechanics (ISRM) Turkish National Group.
Yavuz, H., Demirdag, S., & Caran, S. (2010). Thermal effect on the physical properties of carbonate rocks. International Journal of Rock Mechanics and Mining Sciences, 47(1), 94-103.
Zhu, Z., Tian, H., Jiang, G., & Cheng, W. (2018). Effects of high temperature on the mechanical properties of Chinese marble. Rock Mechanics and Rock Engineering, 51(6), 1937-1942.