Fig. 2 shows a slice image of the 3D CT data of the wet asphalt sample just after drainage: The aggregates, bitumen, water and air are easily distinguishable. Cellulose fibers that were added to the mixture to reduce binder drain down due to high porosity of PA have similar grey values as water, though. It was verified that the sample location is stable during the whole measurement campaign, i.e. the change in the position was less than the size of a voxel. This allows for restricting the region of interest to the pores determined from the dry sample, and a straightforward segmentation of the water