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Open research questions in Recycled Aggregate Concrete Performance

103 gap statements mined from Recycled Aggregate Concrete Performance papers in our 4.5M-paper local library, which holds 1,148 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • A key limitation of recycled concrete aggregate (RCA) is its high variability, stemming from differences in source concrete quality, processing, and contamination. Unlike natural aggregates, properties such as density, water absorption, and strength largely depend on adhered mortar content and parent material characteristics.

    Recycled concrete aggregates derived from construction waste: potential applications in structural engineering · 2026 · DOI

  • Lack of effective separation and sorting processes for waste recovery. Resistance from builders to adopt new materials and construction methods. The need for a practical tool to address gaps and assess material flows in construction.

    Evaluating Circularity of Plastic Use in Traditional and Modular Urban Construction Through Micro-Indicators · 2026 · DOI

  • Although the adhered old mortar is recognized as the most distinctive feature of RAC, its bidirectional influence on chloride transport, acting as a preferential transport pathway and a chloride-binding reservoir, has not yet been systematically elucidated.

    Multi-Species Modeling of Chloride Ingress in Heterogenous Recycled Aggregate Concrete: Bidirectional Effects of Old Mortar · 2026 · DOI

  • The model is validated through experimental results, but further validation is needed. The study does not investigate the long-term durability of recycled aggregate concrete.

    A New Experiment-Based Numerical Model for Simulating the Mesoscopic Damage of Recycled Aggregate Concrete Under Impact Loading · 2026 · DOI

  • Further validation of the new numerical model is needed. The study's findings can inform the development of new standards for recycled aggregate concrete. The long-term durability of recycled aggregate concrete needs to be investigated.

    A New Experiment-Based Numerical Model for Simulating the Mesoscopic Damage of Recycled Aggregate Concrete Under Impact Loading · 2026 · DOI

  • There is a lack of understanding of the mechanical properties of RBCA concrete. There is a need to develop sustainable construction materials and practices.

    Axial Compressive Behaviour of Steel Tube Confined Recycled Brick–Concrete Aggregate Concrete · 2026 · DOI

  • Existing studies lack a systematic analysis of pricing mechanisms for recycled construction and demolition waste as substrate products. The impact of bargaining power and green sensitivity on profit distribution is not well understood.

    Bargaining and Pricing in Recycling Supply Chains for Construction and Demolition Waste as a Substrate · 2026 · DOI

  • Limited detailed stage-specific quantification of residential construction waste. Lack of understanding of the drivers of current attitudes towards waste reduction. Need for a baseline to measure progress against in the future.

    A Case Study of Residential Construction Waste Generation in New Zealand · 2026 · DOI

  • There is a lack of standardized industry standards for RAC. There is limited construction experience with RAC. There is a need for further research on the long-term durability of RAC.

    The Application of Recycled Aggregate Concrete in Sustainable Civil Engineering · 2026 · DOI

  • There is a lack of understanding of the fire performance of concrete with high recycled aggregate content. The current guidelines for the use of recycled concrete aggregates in construction do not account for their fire performance.

    Experimental Investigations About the Fire Performance of Concrete with High Recycled Aggregate Content (IWCF RILEM 2025) · 2026 · DOI

  • Further studies are needed to validate the results of the simulated model using experimental data. The effects of other factors, such as the type of recycled aggregate and the curing conditions, on the behavior of CFRP-confined RAC short columns should be investigated. The study of the long-term behavior of CFRP-confined RAC short columns is necessary to ensure the safety and reliability of structures.

    Size Effect Analysis of Axial Compressive Mechanical Behavior of CFRP-Confined RAC Short Columns Based on a Three-Dimensional Mesoscopic Finite Element Method · 2026 · DOI

  • Existing research on the axial compressive performance and size effect of carbon fiber-reinforced polymer (CFRP)-confined recycled aggregate concrete (RAC) short columns mainly relies on macroscopic experimental analysis, lacking research methods capable of reflecting the heterogeneous characteristics of materials and mesoscopic damage evolution mechanisms.

    Size Effect Analysis of Axial Compressive Mechanical Behavior of CFRP-Confined RAC Short Columns Based on a Three-Dimensional Mesoscopic Finite Element Method · 2026 · DOI

  • The stability of transportation infrastructure in permafrost regions is threatened by warming and engineering disturbance. The use of recycled aggregate concrete in permafrost regions is limited by its low early-age mechanical performance.

    Early-Age Strength Development and Microstructural Mechanisms of CO 2 -Cured Recycled Weathered Limestone Concrete · 2026 · DOI

  • There is a need to investigate the effects of CO2 curing on the mechanical performance of recycled aggregate concrete. There is a lack of understanding of the microstructural mechanisms underlying the enhancements in the concrete’s early-age mechanical performance.

    Early-Age Strength Development and Microstructural Mechanisms of CO 2 -Cured Recycled Weathered Limestone Concrete · 2026 · DOI

  • There is a lack of research on the use of FRCA in self-compacting mortar. The study aims to fill this gap by investigating the effect of FRCA incorporation rates on the properties of self-compacting mortar.

    Effect of fine recycled concrete aggregate incorporation rates on rheological and mechanical properties of self-compacting mortar · 2026 · DOI

  • The study is limited to laboratory evaluations and does not include large-scale field applications. The study does not investigate the long-term performance of recycled aggregates in pavement construction.

    FLEXIBLE PAVEMENT PERFORMANCE EVALUATION FOR ENHANCEMENT IN DESIGN METHODOLOGY · 2026 · DOI

  • There is a need to investigate the use of recycled sand and aggregates in flexible pavement construction. There is a lack of research on the mechanical properties, durability, and suitability of recycled aggregates compared to conventional materials.

    FLEXIBLE PAVEMENT PERFORMANCE EVALUATION FOR ENHANCEMENT IN DESIGN METHODOLOGY · 2026 · DOI

  • Further research should focus on full replacement of natural aggregates and sand with construction and demolition waste. Long-term field performance monitoring and life-cycle cost analysis are needed. Studies on climatic adaptability and fatigue behavior under repeated traffic loads will strengthen confidence in adopting recycled materials for large-scale infrastructure projects.

    EVALUATION OF GEOSYNTHETIC-REINFORCED C&D WASTE FOR FLEXIBLE PAVEMENT APPLICATIONS – A SUSTAINABLE APPROACH · 2026 · DOI

  • There is a need for characterization of construction waste materials in Abuja, Nigeria. The study identifies a gap in the development of valorization strategies for construction waste.

    Compositional analysis and quantification of construction waste from residential building projects · 2026 · DOI

  • Future research should investigate the long-term performance of SSB pavements made with recycled aggregates. Future research should consider the economic feasibility of using recycled aggregates in SSB pavements.

    Türkiye koşullarında beton atıklarından elde edilen geri dönüşüm agregalarının silindirle sıkıştırılmış beton yol kaplama şartnamesi açısından kullanılabilirliğinin değerlendirilmesi · 2026 · DOI

  • There is a lack of understanding of the engineering properties of recycled aggregates and their potential use in SSB pavements. There is a need to identify the limitations and requirements for the use of recycled aggregates in SSB pavements.

    Türkiye koşullarında beton atıklarından elde edilen geri dönüşüm agregalarının silindirle sıkıştırılmış beton yol kaplama şartnamesi açısından kullanılabilirliğinin değerlendirilmesi · 2026 · DOI

  • This involves incorporating building permits, mandatory site waste management plans, allocating duties for waste separation and disposal, and enhancing monitoring and enforcement of illegal dumping. In a sustainable C&D waste management system, there should be dedicated infrastructure, including sorting facilities, a concrete crushing facility, and disposal areas for construction debris.

    Construction and Demolition Waste Management in Kabul, Afghanistan · 2026 · DOI

  • Further research is required to evaluate durability properties, long-term 1 3Circular Economy and Sustainability (2026)…

    Impact of Incorporating Recycled Fine Concrete Aggregate and Recycled Concrete Powder in Mortar: Technical and Environmental Impact Assessment · 2026 · DOI

  • The study uses a Stackelberg game model which may not fully capture the complexity of real-world scenarios, - The study relies on numerical simulations and may not be generalizable to all situations, - The study only considers a limited number of parameters…

    Decision-Making in a Rural Construction Waste Recycling Supply Chain Under the Influence of Transportation Costs and Subsidies · 2026 · DOI

  • Investigating the long-term effects of using eggshell powder and recycled fine aggregate in concrete production. Analyzing the economic and environmental benefits of using recycled materials in concrete production. Developing new concrete mix designs that incorporate recycled materials and optimizing their mechanical properties.

    Effect of Utilizing Eggshell Powder and Fine Recycled Aggregate on the Mechanical Properties of Sustainability Concrete · 2026 · DOI

Most-cited papers in Recycled Aggregate Concrete Performance

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Open questions raised by papers listed on this page include: (1) Lack of effective separation and sorting processes for waste recovery (“Evaluating Circularity of Plastic Use in Traditional and Modular Urban…”, 2026); (2) The model is validated through experimental results, but further validation is needed (“A New Experiment-Based Numerical Model for Simulating the Mesoscopic Damage of…”, 2026); (3) There is a lack of understanding of the mechanical properties of RBCA concrete (“Axial Compressive Behaviour of Steel Tube Confined Recycled Brick–Concrete…”, 2026); (4) The impact of bargaining power and green sensitivity on profit distribution is not well understood (“Bargaining and Pricing in Recycling Supply Chains for Construction and…”, 2026); (5) Lack of understanding of the drivers of current attitudes towards waste reduction (“A Case Study of Residential Construction Waste Generation in New Zealand”, 2026). 103 gap statements have been mined from Recycled Aggregate Concrete Performance papers in our 4.5M-paper local library, which holds 1,148 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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