Figure 1. Extrusion test specimen: CAD (left) and physical while production (right)
To determine the compressive strength (fck, cube, 28 d), cube-shaped specimens with an edge length of 150 mm were produced and stored under water for 28 days (according to DIN EN 12390-2 [11]). The compressive strength was determined in accordance with DIN EN 12390-3 [12]. Table 4 summarizes the test parameters.
Table 4. Test parameters