Durability and impact performance of concrete beam coated with polyurea

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-06-13 DOI:10.1016/j.istruc.2025.109401

Luis Mercedes, Arnau Viella, Ernest Bernat-Maso, Lluis Gil

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Abstract

Polyurea, a versatile and highly durable elastomeric coating, has gained attention in recent years for its potential to enhance the ductility and strength of concrete structures. This study investigates the durability of polyurea-coated prestressed concrete beams under accelerated aging conditions (chloride-induced corrosion), followed by bending and impact testing to evaluate the mechanical effects of the polyurea coating. Results demonstrate that polyurea significantly enhances load capacity, ductility, and resilience against corrosion, effectively protecting structural integrity over time. Specifically, coated beams show a 16 % improvement in maximum load and an 81 % increase in deflection, while uncoated beams experience notable degradation due to corrosion. In impact tests, polyurea-coated beams absorb forces more effectively, showing reduced peak loads, minimized structural damage, and greater post-impact recovery, with a coefficient of restitution of 41–61 % for the uncoated beams and 71–77 % for the polyurea-coated beams. These benefits make polyurea a coating material, capable of extending the lifespan of concrete structures in corrosive and impact-prone environments.

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聚脲涂层混凝土梁的耐久性和冲击性能

聚脲是一种多用途和高度耐用的弹性体涂层，近年来因其提高混凝土结构的延展性和强度的潜力而受到关注。本研究考察了聚氨酯涂层预应力混凝土梁在加速老化条件下（氯化物腐蚀）的耐久性，随后进行了弯曲和冲击试验，以评估聚氨酯涂层的机械效果。结果表明，聚脲显著提高了承载能力，延展性和抗腐蚀弹性，有效地保护了结构的完整性。具体来说，涂覆梁的最大载荷提高了16% %，挠度增加了81% %，而未涂覆梁由于腐蚀而出现明显的退化。在冲击试验中，聚氨酯涂层梁更有效地吸收力，表现出峰值载荷降低，结构损伤最小化，冲击后恢复更大，未涂层梁的恢复系数为41-61 %，聚氨酯涂层梁的恢复系数为71-77 %。这些优点使聚脲成为一种涂层材料，能够延长混凝土结构在腐蚀性和易受冲击环境中的使用寿命。

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来源期刊

Structures Engineering-Architecture

CiteScore

5.70

自引率

17.10%

发文量

1187

期刊介绍： Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.