{"title":"水铸工程胶凝复合材料(WECC)弯曲破坏特征及声发射分析","authors":"Tianyun Zhang , Shuling Gao , Yanping Zhu","doi":"10.1016/j.istruc.2025.108602","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":48642,"journal":{"name":"Structures","volume":"74 ","pages":"Article 108602"},"PeriodicalIF":4.3000,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Flexural failure characteristics and acoustic emission analysis of water-castable engineered cementitious composites (WECC)\",\"authors\":\"Tianyun Zhang , Shuling Gao , Yanping Zhu\",\"doi\":\"10.1016/j.istruc.2025.108602\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>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.</div></div>\",\"PeriodicalId\":48642,\"journal\":{\"name\":\"Structures\",\"volume\":\"74 \",\"pages\":\"Article 108602\"},\"PeriodicalIF\":4.3000,\"publicationDate\":\"2025-03-03\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2352012425004163\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CIVIL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352012425004163","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
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.
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.