Title: COMPARATIVE ANALYSIS OF STRAINS BETWEEN CRUSHED ROCK BASE AND SOIL-CEMENT BASE ASPHALT PAVEMENTS
Abstract: There are two design criteria adopted in the analytical design of asphalt pavement structures, namely: (1) maximum radial tensile strain on the underside of the asphalt concrete surface, and (2) maximum vertical compressive strain on top of the subgrade. Both critical strains control cracking and rutting of the road surface. In this paper a PSAD2A computer program is used to perform a comparative analysis of strain and displacements of five layer asphalt pavements containing crushed rock base and soil-cement base under 3-axle truck loads of 21, 23 and 25 tonnes for road subgrade CBRs of 2, 4 and 6. The results of the analysis show that asphalt pavements with soil-cement base are stronger than those with crushed rock base on the basis of strains and displacements of various layers. The thickness of the AC surface generally has an insignificant effect on strains in the layers of soil-cement pavements, but much more for crushed rock pavements. The result reflects the fact that in designing asphalt roads carrying very heavy traffic loads, asphalt pavements having a soil-cement base will be stronger than crushed rock base pavements. This result can be used as a guideline for designing asphalt roads that generally have the problem of truck overloading. (a) For the covering entry of this conference, please see ITRD abstract no. E204151.
Publication Year: 2000
Publication Date: 2000-01-01
Language: en
Type: article
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