Abstract
High temperature changes the internal microstructure of marble and consequence affects its physical and mechanical performances. In this study, in order to investigate the thermal effects on the fracture behaviors of marble specimens containing mode I crack after different thermal treatments (20, 200, 400, 600, 800 °C), three-point bending (TPB) tests were conducted on rock mechanics testing machine. The results showed that, the fracture toughness and elasticity modulus as well as the longitudinal wave velocity of marble decrease gradually as the temperature increases from 20 to 800 °C. Noted the fracture toughness and the elasticity modulus have a significant linear correlation with the longitudinal wave velocity. Besides, based on the acoustic emission (AE) and digital image correlation (DIC) methods, change laws of horizontal strain field, accumulated AE counts, the aperture of pre-crack of marble specimens under TPB is quantitatively determined. And these change laws are affected by treated temperature. Finally, the discs, directly drilled from the fractured TPB specimens, were carried out to Brazilian tests. And we obtained the tensile strength under different treated temperatures. The tensile strength also shows a significant linear relationship with the fracture toughness in general.
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