Figure 2 shows some transmission (a–c) and dark-field images (d–f) for the angle ϕ = 0° at different points in time.
Here, the above mentioned effects can clearly be seen. While the sample remains unchanged in the
transmission images, a strong change is observed in the dark-field images. At t = 0 hours the six limestone grains are clearly visible in the dark-field image and their approximate vertical position is marked in Fig. 2.
While a clear contrast between the limestone grains of type 2 and 3 (i.e. the grains K2T, K2B and K3T, K3B respectively) and the cement paste remains in the dark-field images during time, this contrast diminishes with time for the