Performance Evaluation of Cement-Stabilized Oil Shale Semicoke as Base or Subbase Course Construction Material

Table 8

UCS test results.

Curing times (days)	Gradation structure types	Minimum strength value (MPa)	Maximum strength value (MPa)	Mean value (MPa)	Standard deviation	Coefficient variation (%)	Strength representative value (MPa)
7	FDS	3.98	5.01	4.51	0.291	6.45	4.03
	SDS	4.01	4.85	4.39	0.306	6.97	3.89
28	FDS	5.01	6.24	5.36	0.385	7.17	4.73
	SDS	6.19	7.71	6.75	0.507	7.51	5.92
90	FDS	5.82	6.31	6.11	0.472	7.21	5.33
	SDS	7.18	7.88	7.49	0.503	7.60	6.66