Title: EFFECT OF TEMPERATURE GRADIENTS ON ASPHALT CONCRETE PERFORMANCE . 5TH CONFERENCE ON ASPHALT PAVEMENTS FOR SOUTHERN AFRICA (CAPSA 89). PROCEEDINGS HELD IN SWAZILAND, 5-9 JUNE, 1989
Abstract: Modern pavement design technology assumes linear elasticity of the pavement materials and does not directly allow for the effect of changing temperature gradients on the performance of asphaltic concrete pavements. It was shown at CAPSA '84 in a paper given by W O Yandell on the mechano-lattice prediction of pavement performance (see IRRD 815718) that it is more appropriate to analyse the pavement as a multi-layered elasto-plastic structure, sustaining repeated one directional loads. This was subsequently verified on a Sydney test road. However, further mathematical research has shown that positive and negative temperature gradings have a marked effect on rutting and cracking life. The authors predict that, for the particular pavement analysed, when the modulus and plasticity of the asphalt in the upper layer is held constant the degree of straight-edge rutting at the surface decreases as the modulus of the lower layer decreases and the plasticity increases. When the modulus and the plasticity of the asphalt in the bottom layer are held constant the degree of straight-edge rutting at the surface was predicted to decrease as the modulus of the upper layer decreases and its plasticity increases. In both cases where temperature profiles were inverted it was predicted that the straight-edge rutting at the surface remains fairly constant but the fatigue life is increased when the stiffer material is in the upper layer.(A) For the covering abstract of the conference see IRRD 828827.
Publication Year: 1989
Publication Date: 1989-01-01
Language: en
Type: article
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