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Feasibility Studies for the use of Recycled Concrete Aggregate and Manufactured Sand in Highway Concrete Pavements

Concrete is second only to water as the most consumed resource in India and the world as well. The basic ingredients of concrete are Cement, Water, Coarse Aggregates and Fine Aggregates. Huge amount of natural resources are exploited and consumed for the production of concrete. Hence there is a need to introduce sustainability in concrete production. In the recent times, Rigid Pavement (Concrete Pavement) is gaining more popularity for the construction of highways as the life of rigid pavement is more than that of flexible pavement. The cost of maintenance of rigid pavement is very less in comparison to flexible pavement. Also the rigid pavement can be designed for perpetuity. The materials used in the rigid pavements can be made more sustainable by partial replacement Natural Coarse Aggregates (NCA) with Recycled Aggregates and Natural River Sand with Manufactured Sand (M. Sand). Cement can also be partially replaced with industrial waste such as Flyash, Slag and Silica Fume. Hence, Sustainable pavement concrete is a concrete mixture, which possess the required strength and performance along with significant reduction in greenhouse emissions as compared to conventional concrete.