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    Long-Term Durability of UHPECC-Embedded GFRP Bars in Alkaline Environments

    Source: Journal of Composites for Construction:;2024:;Volume ( 028 ):;issue: 006::page 04024065-1
    Author:
    Jun-Jie Zeng
    ,
    Zhi-Hao Hao
    ,
    Yuan-Yuan Jiang
    ,
    Qi-Jin Liang
    ,
    Yue Liu
    ,
    Yan Zhuge
    DOI: 10.1061/JCCOF2.CCENG-4834
    Publisher: American Society of Civil Engineers
    Abstract: Novel fiber-reinforced polymer (FRP) bar-reinforced ultrahigh-performance engineered cementitious composites (UHPECCs) have been proposed recently. This innovative composite structure aims to address two critical challenges: (1) the reduced stiffness in FRP-reinforced normal concrete stemming from the lower elastic modulus of FRP; and (2) corrosion concerns faced by steel-reinforced concrete structures. Despite various investigations into the long-term performance of glass fiber–reinforced polymer (GFRP) bars in concrete environments, typically conducted through immersion in simulated concrete pore solutions, the durability of GFRP bars within UHPECCs remains unexplored. The inherently reduced water permeability of UHPECCs raises expectations for the enhanced protection they will provide to internal GFRP bars. Therefore, this study explores the durability performance of GFRP bars embedded in UHPECCs. Three types of GFRP bars made of various matrices (polyester, vinyl ester, and epoxy) were employed. The embedded GFRP bars were immersed in an alkaline solution at room temperature and 40°C for a duration of up to 360 days. Their tensile properties were assessed after specified periods. The results indicated a more pronounced deterioration in GFRP bars made of polyester than bars made of epoxy and vinyl ester. UHPECC covers provided good protection for internal GFRP bars compared with ordinary concrete due to the reduced permeability of UHPECCs. A microstructural analysis revealed that bar deterioration was predominantly due to matrix hydrolysis. This phenomenon resulted in the efficiency of fiber stress transfer. Notably, fibers in UHPECC-embedded GFRP bars exhibited no evident degradation, whereas those in the bars without UHPECC covers displayed slight degradation.
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      Long-Term Durability of UHPECC-Embedded GFRP Bars in Alkaline Environments

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    contributor authorJun-Jie Zeng
    contributor authorZhi-Hao Hao
    contributor authorYuan-Yuan Jiang
    contributor authorQi-Jin Liang
    contributor authorYue Liu
    contributor authorYan Zhuge
    date accessioned2025-04-20T10:31:04Z
    date available2025-04-20T10:31:04Z
    date copyright9/24/2024 12:00:00 AM
    date issued2024
    identifier otherJCCOF2.CCENG-4834.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4304874
    description abstractNovel fiber-reinforced polymer (FRP) bar-reinforced ultrahigh-performance engineered cementitious composites (UHPECCs) have been proposed recently. This innovative composite structure aims to address two critical challenges: (1) the reduced stiffness in FRP-reinforced normal concrete stemming from the lower elastic modulus of FRP; and (2) corrosion concerns faced by steel-reinforced concrete structures. Despite various investigations into the long-term performance of glass fiber–reinforced polymer (GFRP) bars in concrete environments, typically conducted through immersion in simulated concrete pore solutions, the durability of GFRP bars within UHPECCs remains unexplored. The inherently reduced water permeability of UHPECCs raises expectations for the enhanced protection they will provide to internal GFRP bars. Therefore, this study explores the durability performance of GFRP bars embedded in UHPECCs. Three types of GFRP bars made of various matrices (polyester, vinyl ester, and epoxy) were employed. The embedded GFRP bars were immersed in an alkaline solution at room temperature and 40°C for a duration of up to 360 days. Their tensile properties were assessed after specified periods. The results indicated a more pronounced deterioration in GFRP bars made of polyester than bars made of epoxy and vinyl ester. UHPECC covers provided good protection for internal GFRP bars compared with ordinary concrete due to the reduced permeability of UHPECCs. A microstructural analysis revealed that bar deterioration was predominantly due to matrix hydrolysis. This phenomenon resulted in the efficiency of fiber stress transfer. Notably, fibers in UHPECC-embedded GFRP bars exhibited no evident degradation, whereas those in the bars without UHPECC covers displayed slight degradation.
    publisherAmerican Society of Civil Engineers
    titleLong-Term Durability of UHPECC-Embedded GFRP Bars in Alkaline Environments
    typeJournal Article
    journal volume28
    journal issue6
    journal titleJournal of Composites for Construction
    identifier doi10.1061/JCCOF2.CCENG-4834
    journal fristpage04024065-1
    journal lastpage04024065-11
    page11
    treeJournal of Composites for Construction:;2024:;Volume ( 028 ):;issue: 006
    contenttypeFulltext
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