A Study on the Durability of Dispersive Soils Improved by Alum in Western Jilin Province of China

Table 6

Results of the double hydrometer test and the percentage of exchangeable sodium ion test for the soil samples treated with 2.5% alum.

Mixture amount (%)	Double hydrometer test			Percentage of exchangeable sodium ion test
	Percent finer (0.005 mm) aperture size		Dispersion (%)	Exchangeable sodium ion content	Total cation exchange	ESP (%)
	Without a dispersing agent	With a dispersing agent
2.5	3.35	18.24	18.37	0.29	15.6	1.86