An Experimental Study on Mechanical properties and Durability of Concrete with Recycled Aggregate Concrete and Zeolite

Recently, there has been an increasing trend toward the use of sustainable materials. Sustainability helps the environment by reducing the consumption of non-renewable natural resources. Concrete – the second most consumed material in the world after water – uses a significant amount of non-renewable resources. Efforts aimed at producing environmentally friendly concrete can play a major role in securing sustainable construction.Candidate technologies for sustainable concrete materials include the incorporation of supplementary cementitious materials (SCMs) as a partial replacement for Portland cement; as well as recycled materials in concrete production. As a result, an experimental investigation was conducted to study the mechanical properties and durability of concrete constructed with 15% and 30% recycled aggregate concrete as well as 10% zeolite. This experimental program consisted of fourteen mix designs. Thecompressive strength,split tensile strength, electrical resistivity and chloride ion penetration of recycled concrete mixes were compared with the conventional concrete. Results of this study show that the zeolite and recycled aggregate concrete increased compressive strength,split tensile strength and electrical resistivity also decreased chloride ion penetration of concrete. To overcome inferior durability andmechanical properties of recycled mixes, zeolite (10%) has been added to recycled mixes. Results of the mixes including both recycled aggregate concrete and zeolite show superior durability (both electrical resistivity and chloride ion penetration) compared with the conventional concrete.