Study on Hygroscopic Swelling and Dehumidification Cracking Characteristics of Expansive Soil under Acid Rain and Cyclic Drying-Wetting

Table 5

The average crack width of the sample after one-time cyclic drying-wetting.

pH value	Average crack width (mm)
	Humidity
	22%	17–18%	12–14%	8–9%	4–6%
3	0.00	1.74	1.98	1.40	1.13
5	0.00	1.19	1.46	0.89	0.75
7	0.00	0.90	1.15	0.64	0.54