Abstract
The effect of mechanical load and thermal treatment on sandstone specimen is numerically investigated. Based on Newton’s second law, we established the rate- equation model of sandstone rock specimen under uniaxial mechanic load and fire. We introduce in the model the material nonlinear stress/strain relationship and the effect of material non linearity is analyzed. We show that globally, the amplitude of the internal stress gradually decreases when the temperature increases. The analysis of the internal stress reveals that the combined effect of the thermal treatment and mechanical load on the specimen lead to the rapid damage of the specimen. Heating the specimen to 100°C reduces around 30% of the internal stress. We found that 450°C is a critical temperature of damage for the physical and mechanical properties of this sandstone. Above 450°C of heating, the internal stress tends to fall to zero. Moreover, above this temperature, a significant reduction in strength occurs. This result shows the loss of rigidity of sandstone when the temperature increases and reveals that the fire reduces the mechanical performance of sandstone significantly. The materiel non linearity parameter slowly affects the thermal damage of sandstone.
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References
Inserra, C., Biway, S., and Youqing C., Nonlinear Ultrasonic Characterization of Thermally Damaged Westerly Granite, Jpn. J. Appl. Phys., vol. 48, 2009.
Houpertm R. and Homand, E., Influence of Temperature on the Mechanical behavior of Rocks, Proc. 4th Int. Cong. Rock Mech., Montreux, 1979, pp. 115–122.
Rao, Q., Wang, Z., XIE, H., and Xie, Q., Experimental Study of Mechanical Properties of Sandstone at High Temperature, J. Cent. South Univ. Technol., 2007, s1-0478-06.
Zhang, L., Mao, X., and Lu A., Experimental Study on the Mechanical Properties of Rocks at High Temperature, Science in China, Series E: Tech. Sci., 2009.
Masri,. Shao, J.F., and Sibai, M., Etude de l’effet de la haute température sur le comportement anisotrope de l’Argile de Tournemire, 19e Congrès Français de Mécanique, 2009.
Saiang, C. and Miskovsky, K., Effect of Heat on the Mechanical Properties of Selected Rock Types—A Laboratory Study, Harmonising Rock Eng. Env., 2012.
Hong, T., Kempka, T., Neng-Xiong, X., and Ziegler, M., Physical Properties of Sandstones after High Temperature Treatment, Rock Mech. Rock Eng., 2012, vol. 45, pp. 1113–1117.
Wu, G., Wang, Y., Swift G., and Chen, J., Laboratory Investigation of the Effects of Temperature on the Mechanical Properties of Sandstone, Geotech. Geol. Eng., 2013, DOI 10.1007/s10706-013-9614-x.
Keshavarz, M., Pellet, F.L., and Loret, B., Damage and Changes in Mechanical Properties of a Gabbro Thermally Loaded up to 1000°C, Pure Appl. Geophys., 2010, vol. 167, pp. 1511–1523.
Akos Torok and Monika Hajpal, Effect of Temperature Changes on the Mineralogy and Physical Properties of Sandstone: A Laboratory Study, Restoration of Building and Monuments (Bauinstandsetzen und Baudenkmalpflege), 2005, vol. 11, no. 4, pp. 1–8.
Nubissie, A., Ndoukouo, N. A., and Woafo, P., Dynamical Behavior of a Wooden Beam under Mechanical Loading and Fire, J. Mater. Des., 2011, vol. 32, pp. 133–136.
Ndoukouo, A.N., Noubissie, A., and Waofo, P., On the Dynamics of Fire Exposed Steel Beam under Mechanical Load, J. Constr. Steel Res., 2011, vol. 67, pp. 1864–1871.
Chaki, S., Takarli, M., and Agbodjan, W.P., Influence of Thermal Damage on Physical Properties of a Granite Rock: Porosity, Permeability and Ultrasonic Wave Evolutions, Constr. Build. Mater., 2008, vol. 22, pp. 1456–1461.
Seputro, J., Effect of Support Conditions on Steel Beams Exposed to Fire, Master Thesis in Fire Engineering, School of Engineering, University of Canterbury, New Zealand, 2001.
Bernhart, D., The Effect of Support Conditions on the Fire Resistance of a Reinforced Concrete Beam, Fire Engineering Research Report 04/5, August, 2004.
Somerton, W.H., Thermal Properties and Temperature-Related Behavior of Rock/Fluids System, Developments in Petroleum Science, 1992, vol. 187, pp. 22–29.
Hager, G., Comportement à haute température des bétons à haute performance—évolution des principales propriétés mécaniques, PhD Thesis, Polytechnic School of Cracovie, 2004.
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Ngueyep Mambou, L.L., Ndop, J. & Ndjaka, J.M.B. Theoretical investigations of mechanical properties of sandstone rock specimen at high temperatures. J Min Sci 50, 69–80 (2014). https://doi.org/10.1134/S1062739114010116
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DOI: https://doi.org/10.1134/S1062739114010116