Effect of High Temperature (600°C) on Mechanical Properties, Mineral Composition, and Microfracture Characteristics of Sandstone

Table 3

The geometrical dimensions and fracture toughness of the specimens.

Specimen no.	R (mm)	B mm)	a0 (mm)	ac (mm)	Treatment temperature (°C)	Load Pmax (N)	CMODc (mm)	Elastic modulus (GPa)	Kif (MPa∙m)	Kun (MPa ∙m)
S01	50.20	40.41	20.15	29.20	Rt	1525	0.0821	11.28	0.52	0.76
S02	50.02	40.10	20.14	28.50	Rt	1276	0.0834	8.81	0.44	0.63
S03	49.98	38.88	21.35	27.32	Rt	1178	0.0944	6.48	0.45	0.58
S04	50.23	39.52	20.35	27.18	Rt	1235	0.0915	6.73	0.43	0.58
S05	49.95	40.72	21.08	29.38	Rt	1323	0.0863	9.59	0.47	0.69
Average						1307	0.0875	8.58	0.46	0.65
S06	49.82	40.54	21.58	27.93	600	1150	0.1333	4.65	0.43	0.57
S07	50.16	40.89	20.13	27.71	600	1134	0.1624	3.56	0.38	0.52
S08	50.16	40.89	20.13	27.92	600	1339	0.1667	4.18	0.45	0.62
S09	50.75	40.77	20.94	29.47	600	1234	0.1528	4.82	0.42	0.61
S10	50.13	40.74	22.01	30.37	600	1178	0.1173	7.02	0.42	0.65
Average						1207	0.146	4.85	0.42	0.60

Note. S, SCB specimen; RT, room temperature (without heat treatment).