الفهرس Only 14 pages are availabe for public view
 |  | from | 212 |  |  |
| | | from | 212 | | |
Abstract
Unbound base layers deform under load and contribute to the accumulation of ruts. Therefore , this study was concerned with studying the effect of reinforcement on the behavior of unbound granular material that used in flexible pavement layers as a base course . Two main geothynthetic types were used in this study . These types were woven geotextile and geogrid. Two geogrids were used. The experimental work was designed to evaluate plastic and elastic deformation and the modulus of elasticity of reinforced limestone base course. This experimental work carried out utilizing the static piate loading test in a test-model which simulated the subgrade and base course of the flexible pavement . The effect of base thickness , geogrid depth within the base course and effect of geogrid edges fixation on the deformation characteristics were studied . Moreover, the effect of loading time on the accumulated deformation under a constant pressure of 0.35 N/mm2 at reinforced and control sections was investigated. The construction cost saving of the reinforced sections was calculated to determine the cost benefits .Moreover, theoretical analysis was achieved using Finite Element program (STRAUS) for the purpose of estimating the vertical deformation and stress in the reinforced pavement layers and comparing it with the experimental results .