Table 3.

Comparison of the average compressive strength values depending on the doping level.

Degree of Doping	Average Compressive Strength [MPa]	Standard Deviation
non-doped	84.95	2.35
1.0%	90.75	2.69
2.0%	82.02	0.66
3.0%	76.67	2.67
4.5%	75.48	1.50
6.0%	69.90	2.14
6.5%	68.86	0.88
9.0%	66.17	0.53
10.0%	65.50	4.07
11.0%	66.77	0.87