Temperature-Dependent Modulus and Ultrasonic Velocity of Concrete

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Ding Wang, Jing Tang
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Abstract

The temperature dependence of the internal structure and elastic properties of concrete is revealed by subjecting concrete to different heating conditions. The variation trend of wave velocity in the concrete medium with temperature is analyzed through ultrasonic properties. The decrease in cement matrix modulus and the increase in crack density in concrete are the main factors leading to a decrease in wave velocity. The changes in the composition of the concrete matrix after dehydration are obtained using a thermal decomposition model. Based on the effective medium model, the calculation results of the effective modulus at different temperatures are presented, with a focus on analyzing the influences of the temperature-dependent changes in the matrix elastic properties and the randomly distributed cracks on the effective modulus. The experimental tests and the presentation of the model results indicate a relatively satisfactory agreement, thereby verifying the reliability of the models. The results of this study can explain the basic propagation mechanism of waves in concrete and have promising applications in the ultrasonic testing of thermal damage to cement-based materials.

Abstract Image

混凝土随温度变化的模量和超声波速度
通过将混凝土置于不同的加热条件下,揭示了混凝土内部结构和弹性特性与温度的关系。通过超声波特性分析了混凝土介质中波速随温度的变化趋势。混凝土中水泥基体模量的降低和裂缝密度的增加是导致波速降低的主要因素。利用热分解模型得出了脱水后混凝土基体成分的变化。在有效介质模型的基础上,介绍了不同温度下有效模量的计算结果,重点分析了基体弹性特性随温度变化的影响以及随机分布的裂缝对有效模量的影响。实验测试和模型结果表明两者的一致性比较令人满意,从而验证了模型的可靠性。这项研究的结果可以解释波在混凝土中的基本传播机制,在水泥基材料热损伤超声波测试中具有广阔的应用前景。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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