Open AccessInfluence of heat shock on the strength properties of rocks: an experimental study of thermal fatigue strength
Author(s) -
N. N. Lipatov
Publication year - 2021
Publication title -
doklady akademii nauk vyšej školy rossijskoj federacii/doklady akademii nauk vysšej školy rossii
Language(s) - English
Resource type - Journals
eISSN - 2658-3747
pISSN - 1727-2769
DOI - 10.17212/1727-2769-2020-4-32-40
Subject(s) - weathering , thermal shock , cracking , materials science , porosity , thermal , composite material , mineralogy , geology , geochemistry , physics , meteorology
In the study, various rocks were heated to raise the values up to a temperature of 250 ° C, to determine the values of loss of strength and changes in physical properties, during thermal cycles. As a result of thermal stresses, micro-cracks or visible macro-cracks appear, which lead to noticeable loss of strength depending on various factors such as temperature, heating duration, cooling details and some rock properties such as mineralogical composition, grain size, porosity, microcracks before heating, process [2, 5]. The reason for the loss of strength during heating and cooling, variations in the deformation of various minerals cause cracking in the contacts of the minerals and the propagation of existing cracks. This situation causes the physical weathering of rock materials. In addition, chemical weathering at high temperatures should be noted as one of the main causes of loss of strength due to thermal changes. In physical weathering, the mineralogical composition of rocks and the temperature level are the determining parameters for chemical weathering. Since temperatures in this study are generally not critical for the onset of chemical weathering, the study focused on physical weathering rather than chemical weathering.