Complex salt frost resistance of pre-damaged reinforced HPC columns wrapped with BFRP sheets

IF 4.4 3区工程技术 Q1 ENGINEERING, CIVIL Archives of Civil and Mechanical Engineering Pub Date : 2024-11-19 DOI:10.1007/s43452-024-01098-y

Qi Zhou, Kuihua Mei, Fengxuan Wang, Bo Li, Shengyu Xu, Shengjiang Sun

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Abstract

Fibre-reinforced polymer (FRP) sheets have been extensively used to strengthen existing structures in harsh environments (e.g., freeze–thaw and chemical attacks) due to their excellent mechanical properties and durability. However, the effects of FRP sheets on strengthening reinforced concrete columns eroded by chloride and sulphate ions in freeze–thaw environments remain ambiguous. Therefore, this paper investigates the salt frost resistance of basalt fibre-reinforced polymer (BFRP)-reinforced columns subjected to complex salt-frozen environment. The effects of the freeze–thaw medium, reinforcement method, and pre-damage degree on the salt frost resistance of the columns were evaluated, followed by revealing the freeze–thaw damage mechanism of the columns eroded by sulphate and chloride. Moreover, the correlation between the durability and the mechanical properties of the columns wrapped with BFRP sheets was analysed. Results indicate higher concentrations of sodium chloride and sodium sulphate solutions decelerate the deterioration of high-performance concrete (HPC). The double-layer BFRP sheet wrapping method increases the ultimate load of the columns by 84.8%. The partially damaged epoxy resin coatings can serve as a protective layer for the concrete. The ultimate-transition stress ratio of columns wrapped with double-layer BFRP sheets can be used as an index to evaluate the durability. The proposed BFRP retrofit method demonstrates significant potential for enhancing the durability of HPC in salt frost regions. This method provides a theoretical basis for the durability design of reinforced HPC columns wrapped with BFRP sheets in salt frost regions.

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用 BFRP 片材包裹的预破坏加筋 HPC 柱的复合盐霜抗性

纤维增强聚合物（FRP）板材因其优异的机械性能和耐久性，已被广泛用于加固恶劣环境（如冻融和化学侵蚀）中的现有结构。然而，在冻融环境中，FRP 片材对于加固受氯离子和硫酸根离子侵蚀的钢筋混凝土柱的效果仍不明确。因此，本文研究了玄武岩纤维增强聚合物（BFRP）加固柱在复杂盐冻环境下的抗盐冻性能。评估了冻融介质、加固方法和预破坏程度对柱子抗盐冻性的影响，并揭示了柱子受硫酸盐和氯化物侵蚀后的冻融破坏机理。此外，还分析了用 BFRP 片材包裹的柱子的耐久性与机械性能之间的相关性。结果表明，氯化钠和硫酸钠溶液的浓度越高，高性能混凝土（HPC）的劣化速度就越慢。双层 BFRP 片材包裹法可将柱子的极限荷载提高 84.8%。部分损坏的环氧树脂涂层可作为混凝土的保护层。用双层 BFRP 片材包裹的柱子的极限过渡应力比可作为耐久性的评估指标。所提出的 BFRP 改造方法在提高盐霜地区 HPC 的耐久性方面具有巨大潜力。该方法为盐霜地区用 BFRP 片材包裹的加筋 HPC 柱的耐久性设计提供了理论依据。

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来源期刊

Archives of Civil and Mechanical Engineering 工程技术-材料科学：综合

CiteScore

6.80

自引率

9.10%

发文量

201

审稿时长

4 months

期刊介绍： Archives of Civil and Mechanical Engineering (ACME) publishes both theoretical and experimental original research articles which explore or exploit new ideas and techniques in three main areas: structural engineering, mechanics of materials and materials science. The aim of the journal is to advance science related to structural engineering focusing on structures, machines and mechanical systems. The journal also promotes advancement in the area of mechanics of materials, by publishing most recent findings in elasticity, plasticity, rheology, fatigue and fracture mechanics. The third area the journal is concentrating on is materials science, with emphasis on metals, composites, etc., their structures and properties as well as methods of evaluation. In addition to research papers, the Editorial Board welcomes state-of-the-art reviews on specialized topics. All such articles have to be sent to the Editor-in-Chief before submission for pre-submission review process. Only articles approved by the Editor-in-Chief in pre-submission process can be submitted to the journal for further processing. Approval in pre-submission stage doesn''t guarantee acceptance for publication as all papers are subject to a regular referee procedure.