An electromechanical impedance measurement-based solution for monitoring fresh concrete maturity

IF 2.4 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Intelligent Material Systems and Structures Pub Date : 2024-04-09 DOI:10.1177/1045389x241241599

Guobiao Hu, Yaowen Yang, Lipi Mohanty, Soungho Chae, Kohsuke Ishizeki, Lihua Tang

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Abstract

This paper proposes an electromechanical impedance measurement (EIM)-based solution for monitoring concrete maturity that refers to concrete strength development at the early stage. A smart aggregate (SMA) that consists of a waterproofed piezoelectric patch is developed. The working principle is explained based on the impedance theory of an electromechanically coupled system. A finite element (FE) model of the EIM-SMA unit is established. The stiffness of the applied spring foundation is varied to emulate the concrete hardening process. The simulation results reveal that a peak located between 60 and 70 kHz in the impedance plot could be used as an indication to reflect the stiffness variation of the spring foundation. A 3D-printed mold is designed for rapid production of the EIM-SMA units. In the experiment, two sample EIM-SMA units are used to monitor fresh concrete maturity in the first 6 h after casting. The results of the two sample EIM-SMA units agreed well. The experimental results matched the simulation prediction. Compared to a bar-dropping test that is widely adopted at construction sites, the impedance evolution of an EIM-SMA unit is much smoother and has better monotonicity. In general, the proposed method has been proven to be a reliable solution to monitor the maturity development of concrete.

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基于机电阻抗测量的新拌混凝土成熟度监测解决方案

本文提出了一种基于机电阻抗测量（EIM）的混凝土成熟度监测解决方案，用于监测混凝土早期阶段的强度发展。本文开发了一种由防水压电贴片组成的智能骨料（SMA）。其工作原理基于机电耦合系统的阻抗理论。建立了 EIM-SMA 单元的有限元 (FE) 模型。通过改变弹簧基础的刚度来模拟混凝土硬化过程。模拟结果表明，阻抗图中位于 60 和 70 kHz 之间的峰值可以用来反映弹簧基础的刚度变化。为了快速生产 EIM-SMA 单元，设计了一个 3D 打印模具。在实验中，两个 EIM-SMA 单元样本用于监测浇注后 6 小时内新拌混凝土的成熟度。两个样品 EIM-SMA 单元的结果完全一致。实验结果与模拟预测相吻合。与建筑工地广泛采用的滴棒测试相比，EIM-SMA 单元的阻抗演变更为平滑，单调性更好。总之，所提出的方法已被证明是监测混凝土成熟度的可靠解决方案。

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

Journal of Intelligent Material Systems and Structures 工程技术-材料科学：综合

CiteScore

5.40

自引率

11.10%

发文量

126

审稿时长

4.7 months

期刊介绍： The Journal of Intelligent Materials Systems and Structures is an international peer-reviewed journal that publishes the highest quality original research reporting the results of experimental or theoretical work on any aspect of intelligent materials systems and/or structures research also called smart structure, smart materials, active materials, adaptive structures and adaptive materials.