Acoustic emission analysis of UHPC slabs subjected to coupled hydraulic pressure, stray current, and flexural bending

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-16 DOI:10.1016/j.conbuildmat.2025.141274

Mingyue Chen , Renpeng Chen , Xin Kang

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引用次数: 0

Abstract

Ultra-high performance concrete (UHPC), renowned for its exceptional durability and strength, is projected to play a pivotal role in future underground projects. However, the effects of load, high hydraulic pressure, and stray currents on UHPC durability in underground electric systems, such as subways, remain insufficiently understood due to limitations in existing experimental methodologies. To address this challenge, we developed an advanced corrosiontesting system tailored for deep underground concrete components, incorporating acoustic emission technology to investigate the mechanical degradation of UHPC slabs under combined load, high hydraulic pressure, and stray current conditions. Results reveal that the primary factors influencing UHPC slab corrosion characteristics are, in order of significance: stress ratio, stray current, and high hydraulic pressure. Corrosion tends to cause failure of UHPC slabs at the original crack locations (fragile area) and increases the proportion of tensile cracks. It was determined that embedded reinforcement effectively mitigates the impact of corrosion on crack classification in UHPC slabs, directly establishing a proportional relationship between RA and AF through support vector machine(SVM). These insights are essential for the comprehensive life cycle assessment of UHPC structures in underground environments.

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水压、杂散电流和弯曲耦合作用下UHPC板的声发射分析

超高性能混凝土（UHPC）以其卓越的耐久性和强度而闻名，预计将在未来的地下工程中发挥关键作用。然而，由于现有实验方法的限制，负载、高水压和杂散电流对地下电力系统（如地铁）中UHPC耐久性的影响仍然没有得到充分的了解。为了应对这一挑战，我们开发了一种先进的腐蚀测试系统，专门为地下深处的混凝土构件量身定制，结合声发射技术来研究UHPC板在联合载荷、高水压和杂散电流条件下的机械退化。结果表明，影响UHPC板腐蚀特性的主要因素依次为应力比、杂散电流和高水压。腐蚀容易导致UHPC板在原始裂纹位置（脆弱区）破坏，并增加拉伸裂纹的比例。确定预埋钢筋有效缓解了腐蚀对UHPC板裂纹分类的影响，通过支持向量机（SVM）直接建立了RA与AF之间的比例关系。这些见解对于地下环境中超高压混凝土结构的综合生命周期评估至关重要。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.