Constitutive damage model for polypropylene fiber-reinforced recycled fine aggregate concrete under compressive loading

Abstract

To promote the application of green recycled construction materials in civil engineering, this study presents a statistical damage constitutive model for polypropylene fiber recycled fine aggregate concrete (PRFAC), based on the strain equivalence principle and the assumption that microelement strength follows a Weibull statistical distribution. The proposed model incorporates the Drucker‐Prager failure criterion. By examining the influence of Weibull distribution parameters m and S₀ on the stress‐strain response, empirical relationships were established between the fine aggregate replacement ratio and the distribution parameters. This enabled the derivation of a theoretical stress‐strain curve accounting for variable recycled fine aggregate (RFA) replacement ratios. The experimental results show that the proposed model exhibits high agreement with measured data and effectively captures the increased brittleness of PRFAC with higher RFA replacement ratios. Moreover, increasing the replacement rate accelerates internal crack propagation, reduces deformability and toughness, and significantly hastens the accumulation of internal damage in PRFAC.

Keywords

green concrete / polypropylene fibers / recycled fine aggregate / damage constitutive model / compressive behavior / aggregate replacement ratio

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Funding

National Natural Science Foundation of China(52168022)