Experimental investigation and theoretical analysis of long-term performance for optical fiber Bragg grating-fiber reinforced composite in alkaline concrete environment

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Case Studies in Construction Materials Pub Date : 2024-12-17 DOI:10.1016/j.cscm.2024.e04130

Tiejun Liu , Yangyu Fu , Kexuan Li , Ao Zhou , Renyuan Qin , Dujian Zou

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引用次数: 0

Abstract

Fiber reinforced composite (FRP) is a promising material to encapsulate optical fiber Bragg grating sensors for in-situ structural monitoring and reinforcement. However, the long-term performance of multifunctional optical fiber Bragg grating-basalt fiber reinforced polymer (OFBG-BFRP) in concrete structures remains unclear. Hence, its mechanical and sensing properties under alkaline concrete condition were experimentally investigated and theoretically analyzed. The results showed that the tensile strength and strain sensing range of OFBG-BFRP decreased by 22 % and 43 % under alkaline concrete condition, respectively. The relationship between the elastic modulus and sensing sensitivity was significant with 0.77 Person correlation coefficient. It is revealed that, for OFBG-BFRP bar, the sensing performance degradation in alkaline concrete condition was mainly caused by optical fiber-resin interfacial debonding, while the mechanical deterioration was attributed to resin hydrolysis and basalt fiber-resin interfacial debonding. Based on the deterioration mechanism and chemical etching theory, a service life prediction model is proposed to evaluate the performance of OFBG-BFRP accurately. This work facilitates in-depth understanding on the deterioration behavior and mechanism of OFBG-BFRP bars in concrete structures, inspiring accurate service life prediction for safe and durable FRP reinforced concrete structures.

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光纤Bragg光栅-光纤增强复合材料在碱性混凝土环境下长期性能的实验研究与理论分析

光纤增强复合材料（FRP）是一种很有前途的封装光纤光栅传感器的材料，用于现场结构监测和加固。然而，多功能光纤Bragg光栅-玄武岩纤维增强聚合物（OFBG-BFRP）在混凝土结构中的长期性能尚不清楚。为此，对其在碱性混凝土条件下的力学性能和传感性能进行了试验研究和理论分析。结果表明：在碱性混凝土条件下，OFBG-BFRP的抗拉强度和应变感知范围分别下降了22 %和43 %；弹性模量与传感灵敏度之间的相关系数为0.77。结果表明，在碱性混凝土条件下，OFBG-BFRP杆的传感性能下降主要是由于光纤-树脂界面的脱粘，而力学性能下降主要是由于树脂水解和玄武岩纤维-树脂界面的脱粘。基于老化机理和化学腐蚀理论，提出了一种准确评价复合材料性能的寿命预测模型。本研究有助于深入了解OFBG-BFRP筋在混凝土结构中的劣化行为及机理，为FRP筋混凝土结构的安全耐用提供准确的使用寿命预测。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

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.