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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

41卷

期数:

2024年02期

页码:

17-30

栏目:

综述

出版日期:

2024-03-30

文章信息/Info

Title:

Review on durability of FRP bar reinforced seawater sea-sand concrete materials and components

文章编号:

1673-2049(2024)02-0017-14

作者:

张凯建,王 琳

(福州大学 土木工程学院,福建 福州 350108)

Author(s):

ZHANG Kaijian, WANG Lin

(College of Civil Engineering, Fuzhou University, Fuzhou 350108, Fujian, China)

关键词:

FRP筋;  耐久性;  海水海砂混凝土;  破坏模式转变;  钢-FRP复合筋

Keywords:

FRP bar;  durability;  seawater sea-sand concrete;  transformation of failure mode;  steel-FRP composite bar

分类号:

TU528.572

DOI:

10.19815/j.jace.2023.08055

文献标志码:

A

摘要:

将纤维增强复合材料(FRP)应用在海水海砂混凝土(SSC)中可避免氯离子引起的钢筋腐蚀,但FRP增强海水海砂混凝土(FRP-SSC)结构在恶劣环境中仍存在耐久性问题。依据现有文献研究成果,梳理了海洋环境下FRP筋、SSC以及FRP-SSC构件的耐久性。结果表明:在混凝土的碱性环境以及海水海砂中盐离子的共同作用下,FRP筋的力学性能退化程度与变异性提高,FRP筋与SSC的黏结强度降低; 海水和海砂中盐离子的引入加快了水化反应,提高了SSC的密实度与耐久性,提高了SSC的耐久性; 海洋环境作用导致FRP筋力学性能退化及FRP筋/钢-FRP复合筋(SFCB)与SSC的黏结强度降低,削弱了SSC构件承载力,改变了构件破坏模式,SSC构件承载力随再生粗骨料(RCA)取代率提高而降低; 建议以FRP筋与SSC力学性能变异性量化和基于时变可靠度的构件设计方法作为今后进一步研究的方向。

Abstract:

The application of fiber reinforced polymer(FRP)in seawater sea-sand concrete(SSC)can avoid the corrosin of steel bars induced by the chloride ion, but FRP reinforced seawater sea-sand concrete(FRP-SSC)structures still have durability issues in harsh environments, which is one of the hot and difficult issues of current research. Based on the existing literature, the durability of FRP bars, SSC and FRP-SSC components in marine environments was sorted out. The results show that under the combined effect of the alkaline environment of concrete and salt ions in seawater and sea-sand, the degradation and variability of mechanical properties of FRP bars increase, and the bonding strength of FRP bars and SSC decreases. The addition of salt ions in seawater and sea-sand accelerates the hydration reaction, thus improving the compactness and durability of SSC. The effect of marine environment leads to the deterioration of the mechanical properties of FRP and the reduction of bonding strength between FRP/steel-FRP composite bars(SFCB)and SSC, which weakens the bearing capacity of SSC components and changes the failure mode of SSC components. The bearing capacity of SSC components decrease with the increase of recycled coarse aggregate(RCA)replacement rate. It is suggested that the quantification of variability of mechanical property of FRP bars and SSC, and the time-dependent reliability-based design methods of components should be taken as the direction of further research in the future.

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Liang等^[26]根据预测模型得到BFRP筋在高温高湿条件下暴露50、100、200年后,抗拉强度折减系数分别为0.77、0.75、0.73。

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备注/Memo

备注/Memo:

收稿日期:2023-08-17
基金项目:国家自然科学基金项目(52008304); 福建省自然科学基金项目(2023J05021)
作者简介:张凯建(1989-),男,工学博士,副教授,E-mail:kaijian.zhang@fzu.edu.cn。

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更新日期/Last Update: 2024-03-25