水铸工程胶凝复合材料(WECC)弯曲破坏特征及声发射分析

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Tianyun Zhang , Shuling Gao , Yanping Zhu
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引用次数: 0

摘要

水下混凝土构件暴露在多荷载耦合环境下,对不易发现的裂缝进行有效控制和修补是至关重要的。本研究旨在设计具有优异裂缝控制能力的水铸工程胶凝复合材料。这种材料可以在水下环境中进行有效的修复,而不会影响原有结构的可用性。以不同剂量的水洗海砂和絮凝剂为变量,配制了9种类型的WECC,并对27个薄片试样进行了抗弯性能测试。分析了不同试样的极限抗弯强度、韧性指数和变形指数,并利用声发射(AE)设备对破坏全过程进行了监测。WECC具有良好的水下浇注性能和良好的力学性能,极限抗弯强度为7.35 MPa ~ 10.23 MPa,最大韧性指数为375.13,最大变形指数为112.77。声发射分析表明,适当的絮凝剂用量(2 %)和砂胶比(0.25)可有效减缓WECC损伤进展。增加水洗海砂含量会降低基体强度,促进纤维的拉出和滑移,而絮凝剂含量增加会增加内部孔隙率,加速损伤进程,降低WECC的极限抗弯强度和延性。本研究为利用WECC修复水下构件提供了实验基础和理论参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flexural failure characteristics and acoustic emission analysis of water-castable engineered cementitious composites (WECC)
It is essential to effectively control and repair cracks that are not easily detected when underwater concrete components are exposed to a multi-load coupled environment. This study aims to design water-castable engineered cementitious composites (WECC) with superior crack control capability. The material enables efficient repair in underwater environments without compromising the original structural serviceability. Nine types of WECC were formulated with varying dosages of washed sea sand and flocculant as variables, and 27 thin sheet specimens were tested for their flexural performance. The ultimate flexural strength, toughness index, and deformation index of different specimens were analyzed, and acoustic emission (AE) equipment was used to monitor the entire failure process. WECC demonstrates excellent underwater castability and competitive mechanical properties, with ultimate flexural strength ranging from 7.35 MPa to 10.23 MPa, and maximum toughness and deformation indices of 375.13 and 112.77, respectively. Acoustic emission analysis reveals that an appropriate dosage of flocculant (2 %) and sand-colloid ratio (0.25) effectively slows down damage progression in WECC. Increasing the washed sea sand content reduces matrix strength, facilitating fiber pull-out and slippage, while higher flocculant content increases internal porosity, which accelerates damage progression and reduces the ultimate flexural strength and ductility of WECC. This study provides an experimental foundation and theoretical reference for the repair of underwater components using WECC.
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来源期刊
Structures
Structures Engineering-Architecture
CiteScore
5.70
自引率
17.10%
发文量
1187
期刊介绍: Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.
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