Toward a codified design of recycled aggregate concrete structures: Background for the new fib Model Code 2020 and Eurocode 2. (9th December 2020)

• Record Type: Journal Article
• Authors: Tošić, Nikola; Torrenti, Jean Michel; Sedran, Thierry; Ignjatović, Ivan
• Is Part Of: Structural concrete. Volume 22:Number 5(2021)
• Page Start: 2916
• Page End: 2938
• Publication Date: 2020-12-09
• Subjects: concrete structure -- design -- mechanical property -- model code -- recycled aggregate -- recycled concrete; Reinforced concrete -- Periodicals; 624.1834
• DOI: 10.1002/suco.202000512
• Languages: English
• ISSNs: 1464-4177

Abstract

Abstract: The use of recycled aggregate (RA) to produce recycled aggregate concrete (RAC) is a proven way of decreasing the consumption of natural aggregate (NA) and the landfilling of construction and demolition waste. However, adoption of codes for the design of RAC and RAC structures has been lacking. Within the framework of the new fib Model Code 2020 and Eurocode 2, provisions for RAC can be adopted. Therefore, in this study, a comprehensive and critical review of literature on RAC is performed as well as own meta‐analyses of results. Material properties of RAC and structural behavior of reinforced and prestressed RAC members are analyzed, and based on the findings, code adjustments for RAC are proposed. The results show that, in order to incorporate RAC into design codes, changes are necessary in expressions for physical–mechanical properties (volumetric mass, modulus of elasticity, tensile strength, fracture energy, peak and ultimate strains, shrinkage strain and creep coefficient), durability‐related properties (minimum concrete cover for durability) and structural behavior (shear strength of members not requiring shear reinforcement and deflections). The recommendations are formulated in terms of the total mass substitution ratio of RA that can be classified as Type A according to standard EN 206 for concrete. The results and findings presented herein can provide an important contribution toward the codification of RAC use and the wider utilization of RA in construction.