Table 5.

Compressive strength of investigated materials.

	CR		CF
Sample No.	Crushing force[kN]	Compressive strength [MPa]	Crushing force[kN]	Compressive strength [MPa]
1	651.28	65.13	687.53	68.75
2	672.48	67.25	702.35	70.24
3	651.06	65.11	727.43	72.74
4	661.53	66.15	695.48	69.55
5	700.58	70.06	713.68	71.37
6	697.88	69.79	722.59	72.26
Mean value	672.47	67.25	708.18	70.82
Standard deviation	22.19	2.22	15.69	1.57