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

Figure 9

Crack development of sample with different pH value solution after one-time cyclic drying-wetting (5000 times larger). (a) pH = 7, (b) pH = 5, and (c) pH = 3.