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| TEST RESEARCH ON MECHANICAL PROPERTIES OF MARBLE UNDER HIGH TEMPERATURE |
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Abstract Laboratory tests were made to study the mechanical properties of Xuzhou marble from room temperature to 800 ℃. The changes of peak stress，peak strain，elastic modulus and complete stress-strain curve of marble at high temperature and after high temperature were analyzed in detail. The mesoscopic characteristics of the marble under different temperature conditions were discussed using scanning electron microscope(SEM). The results show that the volume of marble increases，and its mass and density decrease with the rise of temperature. The mechanical properties of marble change little when the temperature is below 400 ℃. The peak stress and elastic modulus of marble decrease in different amplitudes when the temperature is above 400 ℃. The peak strain of marble increases significantly with increasing temperature. The structure change of marble at 800 ℃ leads to the mutations of its mechanical properties. The strength index(peak stress，elastic modulus) of marble after high temperature is lower than that at high temperature. The peak strain of marble after high temperature is lower than that under high temperature. The major section microcracks for marble are tensile cracks when the temperature is below 200 ℃. When the temperature is above 600 ℃，the section of marble appears polycondensation crack and shear crack，and the number of these cracks gradually increases. The expansion and coalescence of microcracks for marble after high temperature become more apparent than at high temperature.
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Received: 25 December 2011
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2012, Vol. 31 
