{"title":"船用涂砂复合玻璃钢管:海水下与海水-海砂混凝土的粘结性能","authors":"Jivan Subedi , Milad Bazli , Shalik Dhungana , Ali Rajabipour , Reza Hassanli , Mehrdad Arashpour","doi":"10.1016/j.marstruc.2025.103872","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigates the durability of the bond between sand-coated hybrid carbon-glass fibre-reinforced polymer (HFRP) tubes and seawater-sea sand concrete (SWSSC) under simulated marine conditions. Concrete-filled filament-wound HFRP tubes were immersed in seawater at temperatures of 25 °C, 40 °C, and 60 °C for durations of 30, 90, and 120 days. Push-out tests were conducted to evaluate the bond performance of the concrete-filled FRP tubes (CFFTs), focusing on failure modes, bond strength, and bond-slip characteristics. Results revealed an initial enhancement in bond strength for all conditioned samples after 30 days compared to unconditioned references, followed by a gradual decline, culminating in a maximum bond strength reduction of 9 % after 120 days. The primary failure mode for conditioned specimens occurred at the interface between the HFRP tube and the sand-coated layer, while unconditioned specimens failed at the interface of the tube and the concrete. The study found that post-peak bond behaviour varied, with bond strength either maintained or gradually reduced, mainly due to the loss of chemical adhesion and friction. Using the fib Bulletin 40 approach, a knock-down factor of 0.5 is recommended for bond strength durability over a 50-year service life in seawater environments. This research stresses the potential of sand-coated HFRP tubes and SWSSC as sustainable, marine-compatible construction materials that meet structural durability requirements.</div></div>","PeriodicalId":49879,"journal":{"name":"Marine Structures","volume":"104 ","pages":"Article 103872"},"PeriodicalIF":4.0000,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Sand-coated hybrid FRP tubes for marine applications: Bond performance with seawater-sea sand concrete under seawater\",\"authors\":\"Jivan Subedi , Milad Bazli , Shalik Dhungana , Ali Rajabipour , Reza Hassanli , Mehrdad Arashpour\",\"doi\":\"10.1016/j.marstruc.2025.103872\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigates the durability of the bond between sand-coated hybrid carbon-glass fibre-reinforced polymer (HFRP) tubes and seawater-sea sand concrete (SWSSC) under simulated marine conditions. Concrete-filled filament-wound HFRP tubes were immersed in seawater at temperatures of 25 °C, 40 °C, and 60 °C for durations of 30, 90, and 120 days. Push-out tests were conducted to evaluate the bond performance of the concrete-filled FRP tubes (CFFTs), focusing on failure modes, bond strength, and bond-slip characteristics. Results revealed an initial enhancement in bond strength for all conditioned samples after 30 days compared to unconditioned references, followed by a gradual decline, culminating in a maximum bond strength reduction of 9 % after 120 days. The primary failure mode for conditioned specimens occurred at the interface between the HFRP tube and the sand-coated layer, while unconditioned specimens failed at the interface of the tube and the concrete. The study found that post-peak bond behaviour varied, with bond strength either maintained or gradually reduced, mainly due to the loss of chemical adhesion and friction. Using the fib Bulletin 40 approach, a knock-down factor of 0.5 is recommended for bond strength durability over a 50-year service life in seawater environments. This research stresses the potential of sand-coated HFRP tubes and SWSSC as sustainable, marine-compatible construction materials that meet structural durability requirements.</div></div>\",\"PeriodicalId\":49879,\"journal\":{\"name\":\"Marine Structures\",\"volume\":\"104 \",\"pages\":\"Article 103872\"},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2025-06-18\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Marine Structures\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0951833925000954\",\"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":"Marine Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0951833925000954","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}
Sand-coated hybrid FRP tubes for marine applications: Bond performance with seawater-sea sand concrete under seawater
This study investigates the durability of the bond between sand-coated hybrid carbon-glass fibre-reinforced polymer (HFRP) tubes and seawater-sea sand concrete (SWSSC) under simulated marine conditions. Concrete-filled filament-wound HFRP tubes were immersed in seawater at temperatures of 25 °C, 40 °C, and 60 °C for durations of 30, 90, and 120 days. Push-out tests were conducted to evaluate the bond performance of the concrete-filled FRP tubes (CFFTs), focusing on failure modes, bond strength, and bond-slip characteristics. Results revealed an initial enhancement in bond strength for all conditioned samples after 30 days compared to unconditioned references, followed by a gradual decline, culminating in a maximum bond strength reduction of 9 % after 120 days. The primary failure mode for conditioned specimens occurred at the interface between the HFRP tube and the sand-coated layer, while unconditioned specimens failed at the interface of the tube and the concrete. The study found that post-peak bond behaviour varied, with bond strength either maintained or gradually reduced, mainly due to the loss of chemical adhesion and friction. Using the fib Bulletin 40 approach, a knock-down factor of 0.5 is recommended for bond strength durability over a 50-year service life in seawater environments. This research stresses the potential of sand-coated HFRP tubes and SWSSC as sustainable, marine-compatible construction materials that meet structural durability requirements.
期刊介绍:
This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.