Characterisation of steel corrosion and matrix damage in reinforced mortar combining analytical, electrical and image-based techniques

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-01-30 DOI:10.1016/j.cemconres.2025.107792

Andreas Alhede , Jelke Dijkstra , Alessandro Tengattini , Karin Lundgren

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引用次数: 0

Abstract

Characterising steel corrosion at the steel-concrete interface and linking it to concrete damage is challenging due to limitations of current non-destructive techniques. This study combines electrical resistance measurements, full-field image-based analyses and analytical techniques to comprehensively characterise steel corrosion and damage in small-scale specimens.

X-ray and Neutron Computed Tomography of two reinforced mortar samples, before and after accelerated corrosion, were used to examine corrosion morphology, interfacial voids, and estimate volumetric strain in the corrosion layer. Inductively Coupled Plasma Mass Spectrometry was employed to measure iron isotope concentrations in water surrounding the specimens.

The results revealed delayed transport of corrosion products relative to mortar cracking. The volumetric expansion coefficients of corrosion products (3.84 and 3.90) align with previous research, and the risk of pitting corrosion correlated with the void size. Overall, the measurements obtained through the various techniques closely aligned with visual observations, providing a robust dataset for calibrating corrosion models.

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结合分析、电气和基于图像的技术表征钢筋砂浆中的钢腐蚀和基体损伤

由于当前无损技术的限制，表征钢-混凝土界面的钢腐蚀并将其与混凝土损伤联系起来是具有挑战性的。本研究结合电阻测量、基于全场图像的分析和分析技术，全面表征了小尺寸试样的钢腐蚀和损伤。对加速腐蚀前后的两个增强砂浆样品进行x射线和中子计算机断层扫描，检查腐蚀形态、界面空隙，并估计腐蚀层中的体积应变。采用电感耦合等离子体质谱法测定样品周围水中的铁同位素浓度。结果表明，与砂浆开裂有关，腐蚀产物的传输延迟。腐蚀产物的体积膨胀系数（3.84和3.90）与之前的研究结果一致，点蚀风险与空洞尺寸相关。总的来说，通过各种技术获得的测量结果与视觉观察结果密切相关，为校准腐蚀模型提供了可靠的数据集。

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

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.