Opening letter of RILEM TC MTZ: Influence of recycled aggregates on multi-interfacial transition zones in recycled concrete

Abstract

Recycled aggregate concrete (RAC) has emerged as a practical route toward low-carbon construction, offering clear environmental advantages by reducing both natural resource consumption and waste generation. The incorporation of recycled aggregates in concrete results in the coexistence of multiple interfacial transition zones (MITZ), which have significant influence on the mechanical performance, durability and functional properties of RAC. However, the formation and performance evolution of MITZ and its influence on performance of RAC remain insufficiently understood. To achieve a better understanding of ITZs in RAC , this Technical Committee (TC) will focus on (1) investigating the formation mechanisms and damage evolution of MITZ, (2) characterizing the anisotropic and heterogeneous characteristics of MITZ across different scales, (3) exploring the key variables on ITZ performance, (4) quantifying the influence of MITZ on the macro properties of RAC, (5) developing innovative technologies to strengthen MITZ, and (6) establishing quantitative models for MITZ evolution.