RESEARCH PROGRESS ON MECHANICAL MECHANISM AND CONSTITUTIVE MODEL OF CFRP STRIP ACTIVELY CONSTRAINED RECYCLED AGGREGATE EXPANSIVE CONCRETE
DOI:
https://doi.org/10.36773/1818-1112-2025-138-3-30-40Keywords:
CFRP strips, active constraint, recycled aggregate, expansive concrete, constitutive modelAbstract
Recycled aggregate (RA) concrete has attracted much attention due to its environmental benefits, but its low mechanical properties and high brittleness limit its application in structures. Fiber-reinforced polymer (FRP) confinement is an effective means to improve its performance. Among them, the "active confinement" achieved by combining expansive concrete (EC) with CFRP strips is a promising new technology. This technology generates pre-tension stress in the CFRP strips through chemical expansion, placing the core concrete in a triaxial pre-compression state, thereby optimizing concrete performance before loading. However, the interaction between the porosity of recycled aggregate, the effectiveness of the expansive agent, and the discontinuous confinement effect of the CFRP strips is very complex, and its mechanical mechanism is not yet clear, nor is a mature constitutive model available. This paper aims to systematically review the current research status of the mechanical mechanism and constitutive model of CFRP strip-confined recycled aggregate expansive concrete. First, the multiple physical and mechanical coupling mechanisms among the expansive agent, recycled aggregate, and CFRP strips were explored. Second, the influence of key factors such as the replacement rate of recycled aggregate, the type of expansive agent, and the spacing of CFRP strips on the mechanical properties of the composite structure was reviewed. Finally, the limitations of existing constitutive models were analyzed in detail, pointing out that existing models cannot accurately describe the full stress-strain curve of this novel composite material. This paper aims to clarify the research gaps in this field and provide direction for the future development of high-precision constitutive models.
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