Effect of Desert Sand on the Mechanical Properties of Desert Sand Concrete (DSC) after Elevated Temperature

Table 6

Experimental results of DSC after elevated temperature.

Index	T (°C)	DSRR-0%	DSRR-20%	DSRR-40%	DSRR-60%	DSRR-80%	DSRR-100%
Mass loss rate (%)	RT	0	0	0	0	0	0
	100	0.64	0.73	0.68	0.65	0.63	0.62
	300	3.10	3.50	3.35	3.16	3.08	3.03
	500	4.31	4.80	4.77	4.30	3.96	3.88
	700	6.48	6.86	6.63	6.30	5.96	5.72
Compressive strength (MPa)	RT	47.67	48.79	51.09	48.29	46.85	43.67
	100	50.82	51.62	56.24	53.54	48.57	47.07
	300	48.50	50.77	56.31	54.94	51.02	47.37
	500	42.26	47.58	49.65	44.38	42.05	40.79
	700	34.06	34.55	35.20	31.50	30.84	30.00
Splitting tensile strength (MPa)	RT	1.88	1.94	2.40	1.99	1.76	1.75
	100	1.99	2.04	2.45	2.12	1.77	1.80
	300	1.14	1.20	1.59	1.35	1.23	1.36
	500	0.81	0.84	0.91	0.89	0.78	0.75
	700	0.66	0.68	0.74	0.61	0.65	0.54
Flexural strength (MPa)	RT	3.45	3.53	3.89	3.63	3.45	3.43
	100	3.07	3.36	3.59	3.45	3.27	3.25
	300	2.26	2.45	2.64	2.31	2.33	2.30
	500	1.04	1.34	1.36	1.31	1.20	1.16
	700	0.73	0.95	0.99	0.98	0.97	0.94
Ultrasonic wave velocity (km·s^−1)	RT	4.28	4.37	4.41	4.32	4.25	4.16
	100	4.22	4.33	4.37	4.28	4.23	4.18
	300	3.55	3.77	3.74	3.71	3.68	3.66
	500	1.51	1.79	1.81	1.83	1.81	1.91
	700	1.21	1.37	1.46	1.66	1.60	1.74
Neutralization depth (mm)	RT	1.88	1.84	1.62	1.50	1.50	1.51
	100	1.87	1.79	1.58	1.55	1.21	1.14
	300	1.93	1.98	1.73	1.63	1.40	1.38
	500	5.81	5.15	5.55	4.81	4.56	3.81

RT, room temperature.