Influence of Early Dry-Wet Cycles on Performance and Durability of Steel-Fiber Recycled Coarse Aggregate Concrete.

Authors

Jie Wu, Dewen Liu, Shengwen Li, Yong Ding, Shian Mu

Published in

Annals of the New York Academy of Sciences. Volume 1560. Issue 1. Pages e70328.

Abstract

To enhance the durability of recycled coarse aggregate concrete (RCAC) under early dry-wet cycles, this study investigates the effects of incorporating copper-plated steel fibers (CPSFs) at volume fractions of 0%, 0.5%, 1.0%, and 1.5%. We systematically evaluated the Cl^- erosion resistance, splitting tensile strength, mass-change rate, pore structure, phase composition, and microstructural evolution of RCAC subjected to 21 NaCl dry-wet cycles. Results show that CPSF effectively inhibits microcrack propagation and improves the interfacial transition zone within the concrete matrix. At a fiber content of 1.5%, the mass of the specimen increased by 1.23% after 21 erosion cycles, and the splitting tensile strength reached 2.86 MPa, which is 80% higher than that of the fiber-free control group. Comprehensive evaluation using the entropy weight method confirms that RCAC with 1.5% CPSF exhibits the best durability performance. This study demonstrates that an appropriate dosage of CPSF significantly mitigates the detrimental effects of early dry-wet cycles on RCAC performance.

PMID:
42308381
Bibliographic data and abstract were imported from PubMed on 18 Jun 2026.

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