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.