Many physical processes in the field of rock physics are influenced by the presence of fractures and microcracks. Therefore, intact rock samples are often used for reproducible experimental studies, and cracks are artificially created by various methods. For this, one possibility is the use of thermal treatments. In this work, twelve different thermal treatments are experimentally studied for dry Bianco Carrara marble under ambient conditions. The focus is primarily on the influence of the cooling rate (slow versus fast cooling) in combination with different applied maximum temperatures. This also raises the question of the influence of the specimen size, which has never been systematically investigated in this context before. Therefore, three sizes of cylindrical core samples are investigated to identify a potential specimen size effect. As effective quantities on the core-scale, the bulk volume, the bulk density, and the P- and S-wave velocities, including shear wave splitting, are examined. To obtain a three-dimensional insight into the mechanisms occurring on the micro-scale level, micro X-ray Computed Tomography ($\mathrm{\mu }$XRCT) imaging is employed. For both cooling conditions, with increasing maximum temperature, the bulk volume increases, the propagation velocities significantly drop, and shear wave splitting increases. This behavior is amplified for fast cooling. The bulk volume increase is related to the initiated crack volume as $\mathrm{\mu }$XRCT shows. Based on comprehensive measurements, a logarithmic relationship between the relative bulk volume change and the relative change of the ultrasound velocities can be observed. Although there is a size effect for fast cooling, the relationship found is independent of the specimen size. Also the cooling protocol has almost no influence. A model is derived which predicts the relative change of the ultrasound velocities depending on the initiated relative bulk volume change.

岩石物理学领域的许多物理过程都受到裂缝和微裂纹的影响. 因此，完整的岩石样品通常用于可重复的实验研究，并通过各种方法人为地产生裂缝。为此，一种可能性是使用热处理。在这项工作中，在环境条件下对干燥的 Bianco Carrara 大理石进行了十二种不同的热处理实验研究。重点主要是冷却速率（慢速冷却与快速冷却）与不同应用的最高温度相结合的影响。这也提出了样本大小影响的问题，此前从未在此背景下进行过系统研究。因此，研究了三种尺寸的圆柱形岩心样品，以确定潜在的样品尺寸效应。作为核心尺度上的有效量，体积体积、体积密度以及 P 波和 S 波速度，包括剪切波分裂，进行检查。为了获得对微观尺度上发生机制的三维洞察，微型 X 射线CT检查 （$\mathrm{\mu }$XRCT)成像被采用。对于这两种冷却条件，随着最高温度的增加，体积增加，传播速度显着下降，剪切波分裂增加。这种行为被放大以实现快速冷却。体积体积增加与起始裂纹体积有关$\mathrm{\mu }$XRCT 显示。基于综合测量，可以观察到相对体积变化与超声速度相对变化之间的对数关系。尽管快速冷却存在尺寸效应，但发现的关系与试样尺寸无关。冷却协议也几乎没有影响。推导出一个模型，该模型根据启动的相对体积变化预测超声速度的相对变化。