Author(s): Lucas M Ferreira, Ana R Vasquez, Miguel A Torres and Sofia L Romano

Abstract: Recycled aggregate concrete has emerged as a promising material for improving sustainability in the construction sector by reducing natural aggregate consumption and construction and demolition waste. This research presents an experimental assessment of recycled aggregate concrete intended for use in secondary structural components such as lintels, slabs, partition beams, and non-primary load bearing members. Laboratory investigations were carried out on concrete mixes incorporating varying proportions of recycled coarse aggregates replacing natural aggregates. Fresh concrete properties were evaluated through workability measurements, while hardened concrete performance was examined using compressive strength, split tensile strength, flexural strength, density, water absorption, and stress strain behavior tests. Particular emphasis was placed on evaluating performance at curing ages relevant to practical construction timelines. The results indicate that recycled aggregate concrete exhibits marginal reductions in mechanical strength compared to conventional concrete, primarily due to the presence of adhered mortar and higher porosity of recycled aggregates. However, strength levels remained within acceptable limits for secondary structural applications when appropriate mix design adjustments were implemented. Durability related indicators such as water absorption and density showed predictable trends with increasing recycled aggregate content, highlighting the importance of controlled replacement ratios. The experimental findings demonstrate that up to moderate levels of recycled aggregate substitution can produce structurally reliable and environmentally beneficial concrete. This research reinforces the feasibility of recycled aggregate concrete as a sustainable alternative for secondary structural components and provides experimental evidence to support its responsible adoption in practice, contributing to circular economy objectives within the construction industry. The outcomes also underline the need for standardized guidelines, quality control of recycled aggregates, and performance-based acceptance criteria to enable engineers, contractors, and policymakers to confidently integrate recycled aggregate concrete into routine construction while maintaining safety, serviceability, and long-term sustainability goals across diverse structural and environmental conditions worldwide today.

DOI: 10.22271/27078280.2026.v7.i1a.60

Pages: 22-26 | Views: 2 | Downloads: 2

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