Iv. Kuznetsova et Ad. Startsev, METHODS OF INVESTIGATING SWELLING AND SHRINKAGE OF SOIL AS RELATED TOITS STRUCTURE, Eurasian soil science, 24(9), 1992, pp. 113-119
A method of studying swelling and shrinkage and the density and porosi
ty of soil peds by controlled alteration of their moisture content aft
er applying a 10 percent solution of natural rubber in white gas, whic
h forms a thin elastic film on the surface of the specimen, is describ
ed. The permeability of the film to water and gas is regulated by perf
orating it with a needle.