The Equilibrium Time and Salt Expansion Characteristic of Sulfate Saline Soil upon Cooling

Table 1

1D test plan for salt expansion of Qinghai silty clay.

Test number	Degree of compaction	Sample size	The cooling rate of an incubator	Cooling method
B1	0.95	H = 11.59 cm and D = 17.90 cm	1°C/min	Air bath
S1, S2, S3, and S4	0.84, 0.89, 0.93, and 0.97	H = 4.00 cm and D = 6.18 cm	1°C/min	Air bath
S5, S6, S7, and S8	0.84, 0.89, 0.93, and0.97	H = 4.00 cm and D = 6.18 cm	1°C/h	Air bath
S9	0.95	H = 3.91 cm and D = 8.00 cm	—	Liquid bath

Note. The critical crystallization temperature of samples B1 and S1–S8 was 22°C. The critical crystallization temperature of sample S9 was 20°C.