Durability and Strength Evaluation of Sustainable Concrete Structures
DOI:
https://doi.org/10.54536/ajcec.v2i1.7141Keywords:
Compressive Strength, Durability, Fly Ash, Recycled Aggregate, Sustainable ConcreteAbstract
Rapid urbanization and infrastructure development have led to a substantial increase in concreteplaced greater pressure on natural resources. Ordinary Portland cement accounts for approximately 7-8% of global carbon emissions. At the same time, the need to use recycled materials has become clear as construction and demolition waste increases. This study evaluated the mechanical strength and durability of concrete incorporating recycled concrete aggregate, replacing fly ash and natural aggregate as a partial substitute for cement. Mixtures prepared in different proportions were tested for compressive strength, split tensile strength, flexural strength, modulus of elasticity, water absorption, rapid chloride permeability, and acid resistance at 7, 28, and 90 days. The results show that although the initial strength decreases slightly with the use of 20 percent fly ash, the strength increases significantly through pozzolanic reactions at 90 days. A mixture containing 20 percent fly ash and 30 percent recycled aggregate gave the best results, with a chloride permeability of 950 coulombs and a weight loss in acid of 4.25 percent. Research proves that with proper mix design, sustainable concrete can be an effective solution for environmentally friendly and long-lasting construction.
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Copyright (c) 2026 Ahmed Sagar Ridoy, Ahmed Nafees Hassan, Md. Rafsan Jany, Arup Kumar Saha, Fariba Mahamud
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