NMR Pore Structure and Dynamic Characteristics of Sandstone Caused by Ambient Freeze-Thaw Action

Table 3

Specimens parameters in dynamic compressive tests under different freeze-thaw cycles.

Specimen group and number	Diameter/mm	Height/mm	Strength/MPa		Strain rate/s^−1
			Tested	Average
0 freeze-thaw cycles
1	51.66	49.76	96.95	98.08	77.45
2	51.90	49.80	99.93		73.44
3	52.09	49.80	98.60		73.28
4	51.94	49.80	98.82		73.23
5	52.15	49.80	96.12		75.43
20 freeze-thaw cycles
1	52.03	49.76	94.31	93.59	75.03
2	51.70	49.80	92.52		77.24
3	50.77	49.82	94.19		78.09
4	51.00	49.80	93.83		74.58
5	51.86	49.72	93.12		81.01
60 freeze-thaw cycles
1	51.49	49.82	88.05	87.83	75.93
2	50.90	49.80	88.97		78.76
3	51.00	49.80	86.23		76.04
4	51.69	49.76	87.24		75.42
5	51.91	49.78	88.64		79.68
100 freeze-thaw cycles
1	51.95	49.74	82.81	83.69	73.80
2	51.79	49.80	83.88		77.59
3	51.74	49.80	83.43		69.60
4	51.78	49.80	83.47		76.15
5	52.23	49.76	84.88		72.47
140 freeze-thaw cycles
1	51.90	51.92	78.05	77.03	70.29
2	51.96	51.94	77.79		74.59
3	51.78	51.80	75.61		73.96
4	51.78	51.70	76.36		74.89
5	51.76	51.80	77.33		75.96