Advances in Materials Science and Engineering

Research Article

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Table 5

The mineral composition and mass content of sandstone at various temperatures.


Temperature (°C)	Mineral composition	Chemical formula	Mass content (%)

25	Quartz	SiO₂	67
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	9
	Albite	NaAlSi₃O₈	21
	Anorthite	CaAl₂Si₂O₈	3

100	Quartz	SiO₂	67
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	9
	Albite	NaAlSi₃O₈	21
	Anorthite	CaAl₂Si₂O₈	3

200	Quartz	SiO₂	52
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	14
	Albite	NaAlSi₃O₈	29
	Anorthite	CaAl₂Si₂O₈	5

300	Quartz	SiO₂	47
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	27
	Anorthite	CaAl₂Si₂O₈	19
	Laumontite	Ca [AlSi₂O₆]₂∗4H₂O	7

400	Quartz	SiO₂	57
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	23
	Albite	NaAlSi₃O₈	15
	Anorthite	CaAl₂Si₂O₈	3
	Anorthite, Na-rich	(Ca,Na) (Si,Al)₄O₈	2

500	Quartz	SiO₂	53
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	11
	Albite	NaAlSi₃O₈	26
	Anorthite	CaAl₂Si₂O₈	6
	Anorthite, Na-rich	(Ca,Na) (Si,Al)₄O₈	4

600	Quartz	SiO₂	67
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	9
	Albite	NaAlSi₃O₈	18
	Anorthite	CaAl₂Si₂O₈	4
	Anorthite, Na-rich	(Ca,Na) (Si,Al)₄O₈	2

700	Quartz	SiO₂	75
	Albite, Ca-rich	(Na,Ca)Al (Si,Al)₃O₈	6
	Albite	NaAlSi₃O₈	14
	Anorthite	CaAl₂Si₂O₈	3
	Anorthite, Na-rich	(Ca,Na) (Si,Al)₄O₈	2