Influence of Corrosion Conditions on Prestressing Force and Residual Tensile Capacity of Corroded Prestressed Concrete Steel Strands

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2023-11-23 DOI:10.3151/jact.21.956
Jingyuan Li, Tomohiro Miki, Qiuning Yang, Mingjie Mao
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Abstract

This paper investigates the mechanism of the corrosion pattern of wires on the prestressing forces of prestressed concrete (PC) strands. A rigid frame testing machine combined with an electrically accelerated corrosion device was used to test 16 steel strands. Specimens subjected to the tensile load of 50% of the tensile strength were divided into three groups according to the target corrosion level (mass loss). The rigid frame testing machine can remain the prestressing force, and the force and deformation were measured continuously during the corrosion test. The prestress was degraded in two stages; the beginning and development of the second stage being related to the maximum cross-sectional area loss and fracture type of the wires, respectively. The prestress loss of the strands was the result of the internal force balance after the deterioration of the tensile properties. It was found that the deterioration process of the ultimate tensile capacity related to the fracture type of the wire. The fracture type of PC strand was influenced by the shape and the distribution of the cross-sectional area loss of corroded wires.

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腐蚀条件对腐蚀预应力混凝土钢绞线预应力力和残余抗拉能力的影响
本文研究了预应力混凝土(PC)钢索的腐蚀模式对预应力力的影响机理。采用刚性框架试验机结合电加速腐蚀装置对16根钢绞线进行了试验。在抗拉强度为50%的拉伸载荷下,根据目标腐蚀程度(质量损失)将试样分为三组。刚性框架试验机可以保留预应力,并在腐蚀试验过程中连续测量受力和变形。预应力降解分为两个阶段;第二阶段的开始和发展分别与导线的最大截面积损失和断裂类型有关。预应力损失是拉伸性能恶化后的内力平衡的结果。结果表明,焊丝极限抗拉能力的恶化过程与断口类型有关。腐蚀线材的形状和截面积损失的分布对PC线材的断裂类型有影响。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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