Spatial variability analysis of aged bridge concrete interfacial transition zone using 3D image scanning

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

Cement and Concrete Research Pub Date : 2024-08-07 DOI:10.1016/j.cemconres.2024.107621

Hongtao Cui, Zhonglong Li, Xu Zhang, Yapeng Guo, Shunlong Li

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Abstract

This study employed core specimens taken from a 24-year-old concrete bridge to investigate the ITZ spatial variation. As the lowest hardness component in the concrete, the ITZ was determined by height differences with other components caused by polishing. An automatic method for identifying the ITZ was developed based on 3D images with horizontal and vertical resolutions 1.75 μm and 0.41 μm, respectively. The thicknesses of ITZ and height differences between ITZ and mortar were statistically analysed, and a copula joint distribution model was established to describe these characteristics. The results showed that thicknesses at beam end and midspan were 47.62 μm and 42.95 μm, and height differences were 24.38 μm and 19.98 μm, respectively, indicating that the ITZ degradation in beam end was more severe. However, the correlation coefficients for the joint distribution at beam end and midspan were nearly identical (0.7197 and 0.7111, respectively), showing a relative stable relationship between the ITZ thickness and hardness.

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利用三维图像扫描对老化桥梁混凝土界面过渡区进行空间变化分析

本研究采用从一座有 24 年历史的混凝土桥梁上提取的岩芯试样来研究 ITZ 的空间变化。作为混凝土中硬度最低的成分，ITZ 是通过抛光造成的与其他成分的高度差来确定的。基于水平和垂直分辨率分别为 1.75 μm 和 0.41 μm 的三维图像，开发了一种自动识别 ITZ 的方法。对 ITZ 的厚度以及 ITZ 与灰浆之间的高度差进行了统计分析，并建立了一个共轭联合分布模型来描述这些特征。结果表明，梁端和中跨的厚度分别为 47.62 μm 和 42.95 μm，高度差分别为 24.38 μm 和 19.98 μm，表明梁端 ITZ 退化更为严重。然而，梁端和中跨接合部分布的相关系数几乎相同（分别为 0.7197 和 0.7111），表明 ITZ 厚度与硬度之间存在相对稳定的关系。

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.