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Because some thin, bituminous surfacings in Saskatchewan exhibited satisfactory performance, the Saskatchewan Department of Highways decided three years ago to conduct a study to determine the reasons for such performance. It was felt that such knowledge would contribute much toward a rational approach to the design of pavements.
Factors related to environment and traffic, and which influence the ultimate density of base and subgrade soils, are enumerated and their effects on density are described.
The relationship of pavement thickness to ultimate density of granular and fine-grained, plastic, subgrade soils tested to depth of 6 in. immediately beneath the pavements is shown.
California Bearing Ratio (CBR) strength values of granular soils compacted to different densities are compared. In the case of plastic soils, it is assumed that densities and strengths are equivalent and are discussed and compared on that basis.
Relationship of density of a subgrade soil with depth for an unpaved, gravel maintained road is also shown.
Winnitoy, W. E.
Materials and research engineer, Saskatchewan Department of Highways, Regina, Saskatchewan,