micro-XRCT data sets of a stone mastic asphalt drill core before and after a uniaxial compression test (sample 2): sample 2-3

This data set contains two micro X-ray Computed Tomography (micro-XRCT) data sets resulting from region of interest scans (diameter 58.32 mm, height 46.06 mm) of the center region of a stone mastic asphalt (SMA) drill core. The drill core was scanned with identical scanner settings before ("reconstructed_20200505_01.tar.gz") and after ("reconstructed_20201016_01.tar.gz") a uniaxial compression test. The sample had a diameter of 75.33 mm and a height of 70.64 mm before, respectively a diameter of 76.71 mm and a height of 67.40 mm after the compression test (measured by caliper). The asphalt mixture is a stone mastic asphalt with a nominal maximum aggregate size (NMAS) of 11 mm (SMA 11 S). It contains diabase aggregates and a 50/70 bitumen binder. The material is described in detail by Hu et al. (2017). The compression test was performed by controlling the displacement with the following procedure: Starting the measurement at a contact load of 10 N, where the displacement is set to 0 mm. Increasing the displacecment to 0.1 mm (strain around 0.14 %), with a speed of 50 mm/min. Holding the displacement at 0.1 mm for 300 s. Increasing the displacement by another 0.1 mm (strain around 0.14 %) to 0.2 mm (strain around 0.28 %), with a speed of 50 mm/min and holding it for 300 s. Repeating the procedure of adding displacements 0.1 mm increments (strain around 0.14 %), until the maximum load of 3.7 mm (strain around 5.24 %) is reached and held for 300 s. During the test, time (s), distance (mm), and load (N) were logged at regular intervals and can be found in "2_3_compression_test_data.csv". A visualization of the test procedure is shown in "test_procedure.pdf".

本数据集包含两个微米级X射线计算机断层扫描（micro-XRCT）数据集，这些数据集由对石沥青（SMA）钻心中心区域进行感兴趣区域扫描（直径58.32毫米，高度46.06毫米）所得。钻心在单轴压缩试验前后（分别命名为“reconstructed_20200505_01.tar.gz”和“reconstructed_20201016_01.tar.gz”）使用相同的扫描参数进行扫描。试验前样品直径为75.33毫米，高度为70.64毫米，而试验后样品直径为76.71毫米，高度为67.40毫米（均由卡尺测量）。沥青混合料为石沥青，标称最大集料粒径（NMAS）为11毫米（SMA 11 S），包含辉绿岩集料和50/70沥青结合料。该材料的具体描述可参见Hu等（2017）的研究。压缩试验通过以下步骤进行位移控制：从10牛顿的接触载荷开始测量，位移设定为0毫米。以50毫米/分钟的速率增加位移至0.1毫米（应变约为0.14%），保持该位移300秒。再以相同的速率增加位移0.1毫米（应变约为0.14%），达到0.2毫米（应变约为0.28%），并保持300秒。重复此过程，以0.1毫米的增量增加位移（应变约为0.14%），直至达到最大载荷3.7毫米（应变约为5.24%），并保持300秒。在整个试验过程中，时间（秒）、距离（毫米）和载荷（牛顿）以固定时间间隔进行记录，相关数据可在“2_3_compression_test_data.csv”文件中找到。试验过程的可视化图示可见于“test_procedure.pdf”。