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The Effect of Some Soil Conditioners on Friability and Compactibility of Soils¹

ABSTRACT

The effect is reported of aggregate stabilization with vinyl acetate maleic acid copolymer upon the breaking strength (Modulus of rupture) of soil briquets molded from several soils of known mineral composition at the moisture content equivalent to the one-third atm. point of the treated samples. In most cases the stabilization decreased breaking strength, the differences being greatest at the lower bulk densities. Soils rich in montmorillonite gave generally higher Modulus of rupture values than those rich in kaolinite. Aggregate stabilization with this polymer also reduced compressibility of soils with 1:1 lattice type clay dominant, especially at the higher pressures used. The breaking strength of briquets and the water stability of the 1.0 to 0.25 aggregates tests were compared for several materials used to stabilize Lloyd clay aggregates. The various materials affected these two properties differently. A material that increased aggregate stability greatly does not necessarily reduce the briquet breaking strength appreciably. Inter-aggregate and intra-aggregate bonding is discussed in light of the results. Field and laboratory tests are reported showing that the method of soil treatment with a stabilizer and weather conditions after treatment will modify the effect upon soil crusts formed. Stabilizers sprayed on the surface may give rise to tough soil-plastic crusts that are harder than natural crusts upon drying.

¹ Contribution of the Eastern Section of Soil and Water Management, Soil and Water Conservation Research Branch, ARS, USDA, in cooperation with the USDA Tillage Machinery Laboratory, and the Alabama Agr. Exp. Sta., Auburn, Ala., presented before joint meeting of Div. I and Div. III, Soil Science Society of America, Dallas, Texas, Nov. 19, 1953.

² Soil Scientist.

Received for publication January 19, 1954.