RESEARCH PROGRESS ON DEFORMATION CHARACTERISTICS AND CONFINEMENT EFFECT OF RECYCLED AGGREGATE EXPANSIVE CONCRETE
DOI:
https://doi.org/10.36773/1818-1112-2025-138-3-21-29Keywords:
recycled aggregate concrete, expansion agent, deformation characteristics, constraint effect, self-stress, creep, constitutive modelingAbstract
With the surge in global construction waste (CDW) production and the increasing depletion of natural sand and gravel resources, the widespread application of recycled aggregate concrete (RAC) has become a key strategy for sustainable development in the construction industry. However, the inherent multi-interface transition zone (ITZ) defects, low elastic modulus, and significant shrinkage and creep characteristics of RAC severely limit its application in high-performance structures. Introducing expansive agents (EAs) to prepare recycled aggregate expansive concrete (RAEC) and utilizing chemical prestressing to compensate for shrinkage is considered an effective approach. This paper systematically reviews the deformation characteristics of RAEC and its mechanical response under different constraint conditions. In particular, this paper focuses on the theoretical modeling of restrained expansion and creep stress relaxation, integrating a modified early-age strain development model to predict self-stress evolution. Finally, a comprehensive strategy to improve the service performance of RAEC is proposed based on carbonation modification and mix optimization.
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