Material properties largely depend on their structure, and are strongly dependent on the scale of observation. Under the influence of various processes, the structure of a material can undergo evolution, which leads to major changes in the mechanical parameters and morphology of the medium. To understand the behaviour of a given material exposed to the influence of various factors, e.g. loading and temperature treatment, and to be able to modify it appropriately, it is crucial to recognize its structure both in the scale of engineering applications and at the micro-scale. The article proposes a procedure for assessing changes in the structure of sandstone exposed to the temperature treatment. The presented procedure allows the morphology of the material to be evaluated and the influence of temperature treatment on mechanical parameters of rocks to be analysed, by combining use of different laboratory techniques. The changes in rock material have been characterized using three investigative techniques, i.e. a uniaxial compression test, nanoindentation and micro-computed tomography. The uniaxial compression tests were carried out for 11 different temperature values in the range of 23–1000 °C, which enabled the determination of the change in uniaxial compressive strength and Young’s modulus of the sandstone as a function of temperature. Micro-scale laboratory tests were utilised to identify changes in the mechanical and morphological parameters of the sandstone exposed to the temperature of 1000 °C. The results were referred to those obtained for the reference samples, i.e. not subjected to heating (T = 23 °C). Comparison of the results showed an evident relation between the microstructure changes and the mesoscopic properties.

材料特性很大程度上取决于它们的结构，并且很大程度上取决于观察范围。在各种过程的影响下，材料的结构会发生演变，从而导致介质的机械参数和形态发生重大变化。为了了解给定材料在各种因素（例如负载和温度处理）的影响下的行为，并能够对其进行适当修改，在工程应用规模和微观范围内识别其结构至关重要。规模。该文章提出了一种评估暴露于温度处理下的砂岩结构变化的方法。通过结合使用不同的实验室技术，所提出的程序可以评估材料的形态，并分析温度处理对岩石力学参数的影响。岩石材料的变化已使用三种调查技术进行了表征，即单轴压缩测试，纳米压痕和微计算机断层扫描。在23–1000°C的温度范围内对11个不同的温度值进行了单轴压缩试验，从而可以确定砂岩的单轴压缩强度和杨氏模量随温度的变化。利用微型实验室测试来确定暴露于1000°C温度的砂岩的力学和形态参数的变化。T  = 23°C）。结果的比较表明，微观结构变化和介观性能之间存在明显的关系。