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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, adoptionof 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, provisionsfor RAC can be adopted. Therefore, in this study, a comprehensive andcritical review of literature on RAC is performed as well as own meta-analysesof results.
Material properties of RAC and structural behavior of reinforcedand prestressed RAC members are analyzed, and based on the findings, codeadjustments for RAC are proposed. The results show that, in order to incorporateRAC into design codes, changes are necessary in expressions for physicalmechanical 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 reinforcementand deflections). The recommendations are formulated in terms ofthe total mass substitution ratio of RA that can be classified as Type Aaccording to standard EN 206 for concrete.
The results and findings presentedherein can provide an important contribution toward the codification of RACuse and the wider utilization of RA in construction.
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