Résumé: Asphalt concrete (AC), is a sensitive material compared to other configurations used in civil engineering. Therefore scientists and engineers are constantly trying to improve the performance of asphalt pavements. Modification of the asphalt binder is one approach taken to improve pavement performance. Nowadays, there are different materials that have been employed to reinforce asphalt concrete. Furthermore, fibers and rubber waste are two important examples used for this purpose. The objective of this study to evaluate the static creep behaviour of bituminous concrete modified by rubber crumb inserted in the aggregate of mixtures. The experimental design for this study included the use of different percentages of rubber crumb (0%, 1,5%, 3%, 4,5% and 6%), the mixtures performances already evaluated by the tests (Marshall and Duriez). The tests results indicated that the addition of rubber crumb was show advantages compared to the conventional mixture. However, the excess quantity of this last reduced the resistance of modified mixtures.

Résumé: The accumulation of industrial wastes stemming has a negative influence on the environment. The adopted procedure aimed to eliminate these undesirable wastes through recycling them by utilizing them in appropriate areas. Over the years, recycled has become one of the most attractive flexible pavement rehabilitation alternatives. Different recycling materials are now available to address specific pavement distresses and structural needs. Recycle materials offers multiple environmental advantages: a saving of natural materials, a sharp reduction in the traffic of heavy goods vehicles transporting these materials and thus a great saving of energy. This work constitutes an experimental contribution to the study of the mechanical behavior of various materials coming from the demolition of the building (concrete, brick and breeze block) for their use in the base layers of the flexible pavements. The primary results obtained are extremely encouraging for optimal incorporation of these recycled materials, in the base layers. The utilization in these materials in the road area has therefore allowed the recycling these wastes, decreasing pollution, and using a minimum product requiring important energy and an economy on layers of surface realized with costly materials (bituminous concrete).

Résumé: The accumulation of industrial wastes stemming from the iron and steel industry has had a negative influence on the environment. The adopted procedure aimed to eliminate these undesirable wastes through recycling them by utilizing them in appropriate areas. The objective of this work is to study the mechanical behaviour of a gravel–slag mixture based on crystallized and granulated slag activated by lime. The resistance to punching and the bearing ratio of this slag are studied through Proctor, California Bearing Ratio CBR, compression, and tensile tests for use in the layers of pavement (foundation and base layers). The obtained results of the gravel–slag mixture show very good performances compared with natural aggregates with regard to the resistance and thickness of the layers. The mixture’s utilization in the road area has therefore allowed the recycling these industrial wastes, decreasing pollution, and using a minimum product requiring important energy and an economy on layers of surface realized with costly materials (bituminous concrete).