Table 2.

Mechanical parameters of specimens under UCT and TCT conditions (average value).

Conditions	Parameter	RC-0	RCB-15	RCB-30	RCB-45	RCB-60
UCT	Young’s modulus, E (GPa)	2.96	3.09	3.47	3.54	3.18
	UCS (MPa)	25.20	24.35	26.75	23.01	21.10
	Crack closure stress, σcc (MPa)	5.89	6.23	6.49	5.95	6.81
	Crack initiation stress, σci (MPa)	10.20	11.61	13.03	9.72	10.93
	C = (σci − Pc)/(σp − Pc)	0.40	0.48	0.49	0.42	0.52
	Crack damage stress, σcd(MPa)	20.61	18.91	24.15	19.90	18.82
	D = (σcd − Pc)/(σp − Pc)	0.82	0.78	0.90	0.86	0.89
TCT	Young’s modulus, E (GPa)	15.29	18.88	12.46	24.69	25.12
	TCS (MPa)	73.80	37.94	47.81	58.53	27.85
	Crack closure stress, σcc (MPa)	13.80	12.93	22.81	16.10	9.36
	Crack initiation stress, σci (MPa)	21.15	16.55	27.45	22.72	14.25
	C = (σci − Pc)/(σp − Pc)	0.17	0.24	0.46	0.26	0.25
	Crack damage stress, σcd(MPa)	63.25	31.61	42.10	51.00	24.25
	D = (σcd − Pc)/(σp − Pc)	0.83	0.78	0.85	0.85	0.82