ed to poor subgrades. It hasbeen found that similar road surfaces under similartraffic conditions will stand up in some parts of thecountry but not in others, and the reason must be lookedfor in differences of subgrade. The exact qualities ofsoil which make for good subgrades are not… … Investigation of Subgrade Soils Soil samples of a volume of 1 cu. ft. were sent to thelaboratory and tests were made to determine the per-centages of clay and silt, the colloidal properties, me-chanical analysis, slaking value, cementing value, bear-ing value, specific gravity, capillary…
Automobiles · Aeronautics
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