VALORIZATION OF MATERIALS FROM ROAD WASTES: CASE OF THE SEASHELL AGGREGATE

The main objective of this study is to see to what extent it is possible to recover a material from road waste: the case of the seashell aggregate. Public works produce 100 millions tonnes of surplus and construction waste every year. Among the 100 million tons, 95% is inert and non-polluting waste. And faced with the ever-increasing demand for road construction materials and the scarcity of materials satisfying the specifications, it is urgent to initiate study programs on the possibility of using the materials in place in order to anticipating the total exhaustion of careers. In road works, and in particular for making embankments and capping layers, the bearing capacity of the soil, i.e. its resistance to rupture, is determined by the test C.B.R. (Californian Bearing Ratio) or Californian lift test. Thus, after characterization, the seashell aggregate from road waste was improved with Portland cement with different percentages. We find with a treatment at 1.5% then 2.5% respective CBR values ​​of 94 and 140. This work shows that these materials can be reused in road construction.