Assessment of a Cement Bound Granular Mixture Using Recycled Concrete Aggregate and Coconut Fiber

摘要

When not adequately processed, the construction and demolition waste, CDW, and green coconut shell tend to end in landfills. The big volume of material to be deposited in landfills poses an environmental problem. This work aims to promote circular economy principles under a perspective of waste valorization, by stimulating the use of recycled concrete aggregate (RCA) derived from crushed concrete of CDW, and coconut fibers (CF) coming from green coconut shell. An RCA was characterized and used to produce a cement bound granular mixture (CBGM) for the base/subbase layers reinforced by CF. In laboratory, an experimental program was developed to evaluate the performance of the CBGM incorporating RCA and CF against a traditional CBGM. Mechanical performance was assessed through unconfined compressive strength and indirect tensile strength tests, and the durability was evaluated through the wet-dry durability method. The results indicated an adequate performance underlying the effectiveness of GBGM with RCA and CF to be used in pavement layers.