Effect of heat-treatment on the dynamic compressive strength of Longyou sandstone
2015; Elsevier BV; Volume: 191; Linguagem: Inglês
10.1016/j.enggeo.2015.03.007
ISSN1872-6917
Autores Tópico(s)High-pressure geophysics and materials
ResumoTemperature plays an important role in many rock engineering practices. The increase or decrease of temperature induces the damage characterized by cracks/voids in the rock and thus reduces its strength. Therefore it is essential to quantify the damage induced by the heat-treatment and establish its correlation to the mechanical properties of rocks. In this study, X-ray Micro-computed tomography (CT), a non-destructive observation technique was utilized to quantify the damage induced by the heat-treatment. Using CT images, the damage variables were measured for Longyou sandstone (LS) at three heat-treatment temperatures, 250 °C, 450 °C, and 600 °C, and room temperature of 25 °C. The dynamic compressive strength of LS was then obtained by a modified split Hopkinson pressure bar system with the loading rate from 102 to 104 GPa/s. An empirical equation to quantify the correlation between the damage variable and the dynamic compressive strength was established from the experimental data.
Referência(s)