Research Flexural Test and Crack Development of PVA-steel Fiber Composite Reinforced Recycled Concrete Beams

Minghui Huang

doi:10.6919/ICJE.202510_11(10).0021

Authors

Minghui Huang

DOI:

https://doi.org/10.6919/ICJE.202510_11(10).0021

Keywords:

Recycled Aggregate Concrete Beam; PVA Fiber; Steel Fiber; Maximum Crack Width; The Number of Cracks.

Abstract

Excessive crack width and numerous cracks in high-strength recycled concrete beams significantly impair their serviceability. To address this, steel fibers and polyvinyl alcohol (PVA) fibers-known for their excellent crack resistance-were incorporated into high-strength recycled concrete beams to effectively restrict crack development. Through flexural tests on six steel/PVA fiber-reinforced recycled concrete beams, one natural aggregate concrete beam, and one recycled concrete beam without fibers, the effects of PVA fiber volume ratio, steel fiber volume ratio, and PVA-steel hybrid fibers on the average crack width under serviceability limit state, maximum crack width under ultimate limit state, and the number of cracks during loading were investigated. The results demonstrate that the incorporation of hybrid steel and PVA fibers effectively inhibits cracking in recycled concrete beams, reducing the maximum crack width under ultimate load by 47.5%. The failure load of hybrid fiber-reinforced recycled concrete beams exceeded that of both single-fiber recycled beams and the natural concrete beam, while exhibiting crack resistance comparable to that of natural concrete.

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