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1972•Australian Road Research Board Conference ProcRequires access

SOME EFFECTS OF TEMPERATURE OF BITUMINOUS LAYERS ON DEFLECTION

M J Pawsey, A J Scala

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Abstract

Variations in temperatures will result in significant changes in the load-spreading properties of pavements in which one or more of the courses consist of bituminous concrete. High temperatures reduce the modulus of the bituminous materials and hence increase the vertical stress in the subgrade. This loss of stability may lead to increased deformation in hot weather. Analyses of a number of bituminous pavements with granular sub-bases show that the ratio of the rebound deflection at 50 degree C to that at 10 degrees C is about 3 and appears to independent of the thickness of the bituminous layers. With a stiffer sub-base such as cement stabilised layer, this ration is about 1.5. The implications of these effects in evaluating pavement performance are discussed.

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What this paper is about

Variations in temperatures will result in significant changes in the load-spreading properties of pavements in which one or more of the courses consist of bituminous concrete. High temperatures reduce the modulus of the bituminous materials and hence increase the vertical stress in the subgrade. This loss of stability may lead to increased deformation in hot weather. Analyses of a number of bituminous pavements with granular sub-bases show that the ratio of the rebound deflection at 50 degree C to that at 10 degrees C is about 3 and appears to independent of the thickness of the bituminous layers. With a stiffer sub-base such as cement stabilised layer, this ration is about 1.5. The implications of these effects in evaluating pavement performance are discussed.

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Available abstract

Variations in temperatures will result in significant changes in the load-spreading properties of pavements in which one or more of the courses consist of bituminous concrete. High temperatures reduce the modulus of the bituminous materials and hence increase the vertical stress in the subgrade. This loss of stability may lead to increased deformation in hot weather. Analyses of a number of bituminous pavements with granular sub-bases show that the ratio of the rebound deflection at 50 degree C to that at 10 degrees C is about 3 and appears to independent of the thickness of the bituminous layers. With a stiffer sub-base such as cement stabilised layer, this ration is about 1.5. The implications of these effects in evaluating pavement performance are discussed.

Key concepts: Asphalt, Deflection (physics), Subgrade, Geotechnical engineering, Materials science, Cement, Modulus, Composite material

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