• Anant Kumar
• Nitin Mishra

The escalating volume of construction and demolition (C&D) waste globally presents critical environmental and logistical challenges. Concurrently, the construction sector’s heavy reliance on Natural Coarse Aggregate (NCA) leads to the depletion of natural reserves. In response, this thesis, titled “Towards Sustainable Construction: Mechanical and Durability Assessment of Concrete with Partial and Full Replacement of Coarse Aggregate from C&D Waste,” investigates the feasibility of integrating Recycled Coarse Aggregate (RCA) derived from C&D waste as a sustainable alternative. The study systematically assesses the mechanical behaviour, durability characteristics, and overall performance of concrete incorporating RCA at replacement levels of 0% (control), 20%, 40%, 60%, 80%, and 100% by weight, using an M30 grade mix design. The results showed that concrete performance was adversely impacted by RCA's intrinsic characteristics, particularly its increased porosity and adhering mortar. Because RCA absorbed mixing water and lowered the amount of free water available for lubrication, workability steadily declined as RCA concentration increased. All mechanical strength decreased as replacement increased, with the 28-day compressive strength for the 100% RCA mix falling from 38.5 MPa to 27.2 MPa, a 29.4% decrease from the control mix. Because of higher permeability and a poorer Interfacial Transition Zone (ITZ), durability worsened proportionately to RCA concentration; water absorption rose by 92.8% in the 100% RCA combination, and resistance to freeze-thaw and acid attack dramatically decreased.

RCA, NCA, C&D, Durability, ITZ, Compressive strength.

"Mechanical and Durability Assessment of Concrete with partial and full replacement of coarse aggregate from C&D waste", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 12, page no.c300-c309, December-2025, Available :http://www.jetir.org/papers/JETIR2512235.pdf

"Mechanical and Durability Assessment of Concrete with partial and full replacement of coarse aggregate from C&D waste", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 12, page no. ppc300-c309, December-2025, Available at : http://www.jetir.org/papers/JETIR2512235.pdf