MODELING THE UNBOUND GRANULAR MATERIAL LONG TERM BEHAVIOR

Abstract eng:
The purpose is to evaluate the use of soft limestones as unbound granular base materials. Two limestone materials were studied using cyclic triaxial tests. Two series of tests were performed, first to quantify the influence of fabric factors (aggregate type, water content, fines content, density) on their mechanical properties and second to study their permanent deformation behavior. A statistical model, relating the permanent deformations to the initial state of the material and to the applied stresses has been identified. The laboratory results were then compared with measurements on an experimental pavement, built with one of the tested materials. The permanent strains and water contents in the pavement were monitored for nine months, under real traffic. Results confirm a strong influence of moisture content on the modulus and permanent deformations of the granular material. The site results are in good agreement with the predictive models derived from the laboratory tests.

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