An experimental study on the physico-mechanical properties of two post-high-temperature rocks

Experimental study on the influence of temperature on the mechanical properties of granite under uni-axial compression and fatigue loading

An investigation of thermal effects on micro-properties of granite by X-ray CT technique

The particle mechanics method is used to simulate the process of thermally induced micro- and macrocracks in granite, to elucidate the mechanisms responsible for temperature-dependent mechanical properties The numerical results are quantified and compared with existing results from other experimental data in the literature The results indicate that heating generally reduces the compressive and tensile strengths of granites, first because of increasing thermal stresses, and second because of the generation of tensile microcracks Rock mechanical properties are reduced in specimens subjected to heating–cooling cycles, solely because of the increase in density of thermally induced tensile microcracks The presence of a thermal gradient induces the formation of macrocracks, which propagate from relatively cool to relatively warm areas It is also observed that the boundary condition of the specimen can also affect the development of microcracks

Thermal Influence on Mechanical Properties of Granite: A Microcracking Perspective

High temperature may lead to the development of new microcracks or growth of pre-existing microcracks within granite, varying its physical and mechanical properties. Experiments were conducted to study the evolution of the physical and mechanical properties of granite specimens from room temperature to 800 °C. The specimens were heated in heating furnace and uniaxial compression tests were done using MTS servo-controlled testing machine. The results indicate five phases in the variation of physical and mechanical properties with temperature: from room temperature to 100, 100–300, 300–400, 400–600, and 600–800 °C. The first phase corresponds to the vaporization-escaping interval of adhered water, bound water, and structural water. Larger changes of physical and mechanical parameters in the temperature range of 300–600 °C, mostly 400–600 °C, are probably caused by the transition from the brittle state to plasticity (or ductility) of granite, and 400 °C may be a critical threshold of its thermal damage. These results confirm the important link among physical and mechanical properties in response to thermal treatment.

Wei Shao

Papers

Experimental study on the influence of temperature on the mechanical properties of granite under uni-axial compression and fatigue loading

Experimental research on the behaviour of high frequency fatigue in concrete