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Research of concrete residual strains monitoring based on WLI and FBG following exposure to freeze-thaw tests

机译：基于WLI和FBG的冻融试验后混凝土残余应变监测研究。

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In this work, fiber optic sensors were developed and utilized in concrete structure freeze-thaw cycle monitoring due to their exclusive properties compared with conventional sensing technologies, which can realize more accurate, effective, long-term and real-time monitoring. Fiber Bragg grating (FBG) sensing technique and white light interferometer (WLI) sensing technique were introduced and used to test the residual expansion strain in a number of cylindrical concrete samples. Embedded FBG and WLI sensors were designed and their performances were evaluated in real-time when the concrete samples were saturated with water and subjected to repeated freezing and thawing cycles. This work was intended to show the feasibility of the developed sensors on monitoring the concrete freeze-thaw damage based on residual strain, and a new evaluation index compared with the traditional methods (mass loss rate and relative dynamic elastic modulus). The residual strain sensitively measured by fiber sensors was basically fitted with the phenomenon that the residual strain increased along with the number of freeze-thaw cycles, indicating that two fiber sensing techniques were able to monitor the concrete freeze-thaw damage. Meanwhile, comparing the two techniques from four aspects, WLI was more suitable for residual strain monitoring in concrete freeze-thaw damage. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项工作中，由于光纤传感器与传统的传感技术相比具有独特的性能，因此开发了光纤传感器并将其用于混凝土结构的冻融循环监测中，从而可以实现更准确，有效，长期和实时的监测。介绍了光纤布拉格光栅（FBG）传感技术和白光干涉仪（WLI）传感技术，并用于测试许多圆柱混凝土样品中的残余膨胀应变。设计了嵌入式FBG和WLI传感器，并在混凝土样品用水饱和并经受反复的冻融循环后实时评估其性能。这项工作旨在展示开发的传感器基于残余应变监测混凝土冻融损伤的可行性，以及与传统方法相比（质量损失率和相对动态弹性模量）的新评估指标。由纤维传感器灵敏地测量的残余应变基本上符合以下现象：残余应变随着冻融循环次数的增加而增加，这表明两种纤维传感技术能够监测混凝土的冻融损伤。同时，从四个方面对两种技术进行比较，WLI更适合于混凝土冻融损伤中的残余应变监测。 （C）2015 Elsevier B.V.保留所有权利。

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