Abstract: The purpose of this research is to study the impact of the dope product on a semi-granular bituminous silexite mixture. The new tested material which is silexite is recognized as a sedimentary rock derived from industrial waste from phosphate mining by the chemical industries of Senegal. It has captured the attention of researchers by its quantity, proximity and hardness to make it undergo mechanical and physical tests and to associate it with the hydraulic binder and dope products, so that, it can be an alternative solution to the basaltic material which is becoming rarer and boring day by day. In a first one a mechanical characterization of the material is operated through the tests Los Angeles and Micro Deval which gives satisfactory results for a use of the material in wearing course. Then, it is mixed alone with a 35/50 hydrocarbon binder to form a semi-grained bituminous concrete. The performances obtained do not give enough satisfaction if one refers to the ratio immersion compression which is equal to 0.67<0.70. This report provides information on the ability of the material to resist stripping in the presence of water. So, a lack of adhesiveness has arisen between the binder and the granulate. Following this, it is added two types of dopes namely CECABASE and ITERLENE. Improvements in performance from the point of view of stability, creep and compaction are noted. It has also been found that CECABASE gives better results than ITERLENE. At the end of the analysis made on the silexite material, it is retained that the addition of adhesive dope positively influences on different scales depending on the type, the performance of the bituminous mixture in the presence of water.
Souleymane Mbengue, Djibril Sow, Astou Diokhané, Fatou Samb, Makhali Ba and Ibrahima Khalil Cisse, 2019. Influence of the Dope on a Semi-Granular Bitumen Mixture Silexite. Journal of Engineering and Applied Sciences, 14: 10437-10441.