Recycled mixed aggregate concrete: Quadruple interfacial structure system and its influence mechanisms on mechanical properties

Key Points

• Recycled mixed aggregate concrete shows enhanced mechanical properties due to a quadruple interfacial structure system—this structural complexity is critical.
• The study highlights that concrete with this interfacial structure achieves up to 20% better compressive strength compared to conventional mixtures.
• Observations were made using experimental methods to investigate the influence mechanisms on these mechanical properties.
• Understanding these mechanisms may enable the development of higher-quality concrete, but real-world performance needs further validation.