Title: Modified mechanistic design accounting for permanent deformation of flexible pavement layers
Abstract: Users of accepted mechanistic procedures assume negligible permanent deformations in pavement materials that meet or exceed certain quality requirements. Often, however, significant permanent deformations develop in such materials during service. Also, the many attractions of using lower quality materials are countered by the need to allow for permanent deformations expected with such usage. This paper presents an evaluation of pavement performance data which suggests that there are significant shortcomings to the mechanistic procedures when applied to lower quality pavement layers, especially in the relationships between elastic strains, permanent deformations, and pavement quality indices. A review is presented of some procedures, with the specific intent of incorporating lower-quality sub-base layers into conventional pavement designs. The approach can be adapted to a variety of situations: for example the vast areas of Queensland where no pavement-quality materials exist, and where increased levels of performance are desired from non-standard materials.
Publication Year: 1990
Publication Date: 1990-01-01
Language: en
Type: article
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