Steel fiber's effects on the physical and mechanical characteristics of selfcompacting concrete (SCC) made of recycled gravel

In order to adapt the concrete to structures with more complex and highly reinforced sections,research has been carried out in recent years in Japan with the aim of developing concrete formulationscharacterized by high workability while being stable. (Low segregation, bleeding, and compaction), withgood mechanical characteristics and durability. The culmination of this research has given rise to a newtype of concrete that can satisfy the properties mentioned above, called self-compacting concrete (SCC).SCC is characterized by its high volume of paste, a large amount of fines, the use of superplasticizers, anda low volume of gravel. For the preservation of the environment and in the vision of sustainabledevelopment, due to the increasing demand for the use of aggregates, crushed gravel can be replaced byrecycled concrete gravel. To improve the properties of SCCs based on recycled concrete gravel, metal fibersare added. The objective of this work is to study the effect of the introduction of metal fibers in selfcompacting concretes based on recycled concrete gravel on the physico-mechanical properties of theseSCCs. The results obtained show that 50% recycled concrete gravel is the best, and the 1% fibers improvethe physico-mechanical characteristics of these SCCs.