Étude et valorisation des cendres de tailles micrométriques et nanométriques issues d’un réacteur de pyrolyse des coques d’anacarde : Application aux bétons hydraulique et bitumineux

Abstract

Over the years, industrial development has led to a significant production of residual materials and organic matter around the world. In Canada and Benin, the management of these residual materials is a real problem. Thus, poor management of landfill sites will later lead to leachate infiltration into the water table with potentially high environmental impact risks. The cashew nut shell ash recovery study was conducted to reduce these risks. Cashew nut is a crop of great importance in Benin (nearly 150,000 tons/year). Its industrial processing leads to an abundant production of waste shells (more than 10,000 tons) which are difficult to manage because they are corrosive, harmful and toxic wastes. An experiment to recover cashew nut shells by pyrolysis had been carried out in Benin, but this generates ash which must also be recovered. This study consists in incorporating the ashes into hydraulic concrete or bituminous concrete. The different ash additions replace the quantity of cement added to the concrete, gradually at proportions of 5%, 10%, 15%, 20% and 25% ash. The related physical-mechanical characteristics, i.e. compressive strength, tensile strength, hydraulic conductivity and slump of the concrete over time have been determined. Also, the same work was carried out with bituminous concrete and the characteristics of the said mixture, namely stability, compactness, creep and thickness were determined. The progressive addition of ashes in the asphalt concrete resulted in a decrease of the threads in the asphalt concrete.

Date	20 Aug 2020
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Victor Songmene (Supervisor) & Thierry Godjo (Co-supervisor)