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On the basis of the triaxial test, the development of a rational approach to the design of bituminous paving mixtures is outlined. The influence of the rate of deformation employed for the triaxial test, on the reported stability values of bituminous mixtures, is reviewed. It is demonstrated that data from the triaxial test enable an evaluation to be made of the amount of lateral support that bituminous pavements can develop under load in the field. Triaxial data make it possible to determine the influence of frictional resistance between pavement and tire and between pavement and base on the stability of bituminous pavements. It is shown that this factor has a very marked effect on the ability of bituminous pavements to support stationary and moving loads and to resist braking and acceleration stresses. The influence of pavement thickness on pavement stability is indicated. The treatment of the subject matter is entirely quantitative and is accompanied by equations and illustrated by graphs.
McLeod, Norman W.
Engineering Consultant, Dept. of Transport, Ottawa,