Amélioration de la résistance mécanique des chaussées Souples par ajout de fibres de bois

Abstract

Undoubtedly, the road pavement industry poses significant environmental and climate challenges for both governments and researchers in this field. In our pursuit of a solution, we investigated the potential of sawdust as a renewable alternative to partially replace aggregate in asphalt-mixes. To achieve this, a comprehensive Design of Experiment (DOE) was conducted, assessing the impact of different sawdust content levels (5%, 10%, and 15% of total aggregate volume) on key parameters like Marshall Stability, flow values, density, and Marshall Quotient. Additionally, we explored various factors such as binder content (ranging from 5.77% to 6.45%), manufacturing temperature (from 140°C to 180°C), and mixing time (2 minutes to 4 minutes) to comprehensively understand their influence on the asphalt mix. To bolster durability, the sawdust underwent treatment with a proven emulsion coating. The results unequivocally demonstrate that sawdust can be effectively harnessed as a partial replacement for (3/8) aggregate in asphalt mixes. Implementing this renewable material leads to improved Marshall Stability and Marshall Quotient while reducing density and flow values, all falling within acceptable parameters and yielding positive environmental outcomes. Moreover, viewing sawdust as a waste material makes it a cost-effective solution for the road pavement industry. Hence, our study holds promise as an economically and technically efficient resolution to the challenges faced by the road pavement sector. Embracing sawdust as an aggregate replacement offers a pathway to more sustainable and eco-friendly road construction practices.