micro-XRCT data sets of a stone mastic asphalt drill core before and after a uniaxial compression test (sample 2): sample 2-1

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_20200429_01.tar.gz") and after ("reconstructed_20201015_01.tar.gz") a uniaxial compression test. The sample had a diameter of 75.12 mm and a height of 70.93 mm before, respectively a diameter of 78.05 mm and a height of 67.11 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 load with the following procedure: Starting the measurement at a contact load of 10 N. Increasing the load to 500 N (stress around 0.11 N/mm2) with a speed of 100 mm/min. Holding the load at 500 N (stress around 0.11 N/mm2) for 600 s. Increasing the load by another 500 N (stress around 0.11 N/mm2) with a speed of 100 mm/min and holding it for 600 s. Repeating the procedure of adding load in 500 N (stress around 0.11 N/mm2) increments, until the maximum load of 5000 N (stress around 1.13 N/mm2) is reached and held for 600 s. During the test, time (s), distance (mm), and load (N) were logged at regular intervals and can be found in "2_1_compression_test_data.csv". A visualization of the test procedure is shown in "test_procedure.pdf". NOTE: It turned out that the specimen top and bottom surfaces were not exactly plane-parallel which led to an non-uniform transmission of the load, which lead to a first full-surface contact between the load plate and top surface of the specimen when the 1500 N load increment was reached.

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，源自于对石屑玛蹄脂沥青（SMA）钻芯中心区域感兴趣区域的扫描（直径58.32毫米，高度46.06毫米）。钻芯在单轴压缩试验前（文件名为“reconstructed_20200429_01.tar.gz”）和试验后（文件名为“reconstructed_20201015_01.tar.gz”）使用相同的扫描仪设置进行了扫描。在试验前，样品直径为75.12毫米，高度为70.93毫米；试验后，样品直径增加至78.05毫米，高度减小至67.11毫米（由卡尺测量）。沥青混合料为最大名义集料粒径（NMAS）为11毫米的石屑玛蹄脂沥青（SMA 11 S），其中包含辉绿岩集料和50/70沥青结合料。材料详情由Hu等人在2017年的研究中进行了详细描述。压缩试验通过以下步骤进行控制：从10牛顿的接触载荷开始测量，以100毫米/分钟的速率将载荷增加到500牛顿（应力约为0.11牛顿/平方毫米），保持该载荷600秒。以100毫米/分钟的速率再增加500牛顿（应力约为0.11牛顿/平方毫米）的载荷，并保持600秒。重复以500牛顿（应力约为0.11牛顿/平方毫米）的增量增加载荷的步骤，直至达到最大载荷5000牛顿（应力约为1.13牛顿/平方毫米），并保持600秒。在试验过程中，每隔一定时间（秒）、距离（毫米）和载荷（牛顿）都会进行记录，并可在“2_1_compression_test_data.csv”文件中找到。试验过程的可视化展示在“test_procedure.pdf”文件中。注意：试验结果表明，样品的上下表面并非完全平面平行，导致载荷传递不均匀，当达到1500牛顿的载荷增量时，载荷板与样品顶表面之间出现了首次全面接触。