{"title":"不同界面处理的GFRP混合混凝土梁在潮湿环境下的耐久性和弯曲性能","authors":"Tuna Ülger, Murat Cavuslu","doi":"10.1016/j.cscm.2025.e04988","DOIUrl":null,"url":null,"abstract":"<div><div>This study presents an experimental investigation into the long-term flexural behavior and interface shear failure mechanisms of Concrete-Filled Hybrid Glass Fiber Reinforced Polymer (CF-GFRP) beams exposed to humid environmental conditions. The research primarily focuses on enhancing the bond efficiency at the concrete–GFRP interface using different surface treatment techniques aimed at improving load transfer and mitigating premature debonding. The mechanical properties of the constituent materials - including concrete, GFRP profiles, and bonding adhesives—were comprehensively characterized through laboratory testing. A series of three-point bending tests were conducted on a reference GFRP box beam and four hybrid beam specimens, each incorporating a unique surface treatment strategy: natural bonding (untreated), granular coating, epoxy adhesive, and mechanical fastening. Both short-term performance (after 30 days of curing) and long-term durability (following two years of exposure to uncontrolled outdoor conditions) were assessed. The findings revealed that, except for the naturally bonded specimens, the beams retained a significant portion of their flexural capacity over time, with only moderate reductions observed. Among all configurations, the epoxy-bonded beam exhibited the highest initial flexural strength; however, it also demonstrated the greatest performance degradation under environmental exposure, highlighting the critical influence of environmental durability on bonded interfaces. Detailed observations of crack initiation, propagation, and final failure modes emphasized the importance of optimized surface preparation and mechanical interlocking in promoting structural integrity and long-term serviceability of CF-GFRP beams.</div></div>","PeriodicalId":9641,"journal":{"name":"Case Studies in Construction Materials","volume":"23 ","pages":"Article e04988"},"PeriodicalIF":6.6000,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Durability and flexural behavior of concrete-filled hybrid GFRP beams with various interface treatments under humid environmental exposure\",\"authors\":\"Tuna Ülger, Murat Cavuslu\",\"doi\":\"10.1016/j.cscm.2025.e04988\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study presents an experimental investigation into the long-term flexural behavior and interface shear failure mechanisms of Concrete-Filled Hybrid Glass Fiber Reinforced Polymer (CF-GFRP) beams exposed to humid environmental conditions. The research primarily focuses on enhancing the bond efficiency at the concrete–GFRP interface using different surface treatment techniques aimed at improving load transfer and mitigating premature debonding. The mechanical properties of the constituent materials - including concrete, GFRP profiles, and bonding adhesives—were comprehensively characterized through laboratory testing. A series of three-point bending tests were conducted on a reference GFRP box beam and four hybrid beam specimens, each incorporating a unique surface treatment strategy: natural bonding (untreated), granular coating, epoxy adhesive, and mechanical fastening. Both short-term performance (after 30 days of curing) and long-term durability (following two years of exposure to uncontrolled outdoor conditions) were assessed. The findings revealed that, except for the naturally bonded specimens, the beams retained a significant portion of their flexural capacity over time, with only moderate reductions observed. Among all configurations, the epoxy-bonded beam exhibited the highest initial flexural strength; however, it also demonstrated the greatest performance degradation under environmental exposure, highlighting the critical influence of environmental durability on bonded interfaces. Detailed observations of crack initiation, propagation, and final failure modes emphasized the importance of optimized surface preparation and mechanical interlocking in promoting structural integrity and long-term serviceability of CF-GFRP beams.</div></div>\",\"PeriodicalId\":9641,\"journal\":{\"name\":\"Case Studies in Construction Materials\",\"volume\":\"23 \",\"pages\":\"Article e04988\"},\"PeriodicalIF\":6.6000,\"publicationDate\":\"2025-06-28\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Case Studies in Construction Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2214509525007867\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Construction Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214509525007867","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Durability and flexural behavior of concrete-filled hybrid GFRP beams with various interface treatments under humid environmental exposure
This study presents an experimental investigation into the long-term flexural behavior and interface shear failure mechanisms of Concrete-Filled Hybrid Glass Fiber Reinforced Polymer (CF-GFRP) beams exposed to humid environmental conditions. The research primarily focuses on enhancing the bond efficiency at the concrete–GFRP interface using different surface treatment techniques aimed at improving load transfer and mitigating premature debonding. The mechanical properties of the constituent materials - including concrete, GFRP profiles, and bonding adhesives—were comprehensively characterized through laboratory testing. A series of three-point bending tests were conducted on a reference GFRP box beam and four hybrid beam specimens, each incorporating a unique surface treatment strategy: natural bonding (untreated), granular coating, epoxy adhesive, and mechanical fastening. Both short-term performance (after 30 days of curing) and long-term durability (following two years of exposure to uncontrolled outdoor conditions) were assessed. The findings revealed that, except for the naturally bonded specimens, the beams retained a significant portion of their flexural capacity over time, with only moderate reductions observed. Among all configurations, the epoxy-bonded beam exhibited the highest initial flexural strength; however, it also demonstrated the greatest performance degradation under environmental exposure, highlighting the critical influence of environmental durability on bonded interfaces. Detailed observations of crack initiation, propagation, and final failure modes emphasized the importance of optimized surface preparation and mechanical interlocking in promoting structural integrity and long-term serviceability of CF-GFRP beams.
期刊介绍:
Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation).
The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.