Research on Wetting-Drying Cycles’ Effect on the Physical and Mechanical Properties of Expansive Soil Improved by OTAC-KCl

Table 5

Results of unconfined compressive strength during cyclic wetting-drying process.

Types of soil	Cycles	Unconfined compressive strength (kPa)	Strength loss (%)	Conditions of samples immersed in water
Natural soil	0th cycles	—	—	Cracking after 10-minute immersion in water
	—	—	—
Improved soil	0th cycles	47.73	—	Keeping good conditions without peelings
	2nd cycle	41.24	13.6	In good conditions basically, with a little amount of peelings on the edges
	4th cycle	37.33	21.8	In good conditions overall, with a little amount of cracks on the surface and peelings on the edges