Fluorescent molecular probe based optical fiber sensor dedicated to pH measurement of concrete

Tariq, Ayedah; Baydoun, Jalal; Rémy, Charlotte; Ghasemi, Rasta; Lefèvre, J.; Mongin, Cédric; Dauzères, Alexandre; Leray, Isabelle

doi:10.1016/j.snb.2020.128906

Cited by 36 publications

(18 citation statements)

References 30 publications

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“…2 The proof of this is that several OFS have been reported in recent years for application in concrete structures. 2,[6][7][8][9][10][11] For instance, an OFS for chloride detection in concrete was reported by Ding and coworkers. 11 Lucigenin was immobilised on a sol-gel membrane and the presence of chloride ions quenched the uorescence of the compound with a limit of detection of 0.02 M. OFS for pH monitoring in concrete has also been reported.…”

Section: Introductionmentioning

confidence: 99%

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

et al. 2021

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“…Therefore, OFS enable to monitor and evaluate structural integrity with more accuracy and selectivity, mitigating or preventing structural degradation [61,71,79]. Commonly, OFS are designed to individually monitor parameters such as temperature [64], strain [219,220], pH [66,128,129], moisture [63,197,221], and chloride ion content [28,140]. Variations of those parameters are then transmitted through changes in intensity, frequency, polarization, phase of light, or wavelength.…”

Section: Multifunctional Ofs For Shmmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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“…They were used to measure temperature, strain and relative humidity using fiber Bragg gratings and/or long period fiber gratings [11][12][13][14]. pH measurements, indicative of carbonation, also proved fruitful [15], making use of multimode fibers with pH sensitive polymers in their tip. Non-reversible optical fiber sensors were, also, produced for the monitoring of chloride ion ingress [16,17].…”

Section: Introductionmentioning

confidence: 99%

Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste

2021

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Reinforced concrete structures are an essential part of our modern society, and monitoring their structural health is of paramount importance. Early detection of decay allows for the reduction of repair costs and, more importantly, the prevention of catastrophic failure. For this purpose, a single fiber reflectance spectrometer was embedded in cement paste samples for the monitoring of water at the fiber tip through its sensitivity to changes in the refractive index. It monitored the curing of samples with different water-to-cement ratios (w/c), between 0.45 and 0.60, measuring the water exhaust during the hardening of the cement paste. It also measured the capillary coefficient from cement paste samples of 0.50, 0.55 and 0.60 w/c: 0.668 ± 0.002 mm/√h, 1.771 ± 0.052 mm/√h and 6.360 ± 0.269 mm/√h, respectively. The capillary coefficient values agree with gravimetric measurements of sorptivity and are further confirmed through porosity measurements made with a scanning electron microscope. Thus, single fiber reflectance spectroscopy can be a gateway to inexpensively measure the entire life cycle of cement, from its curing until its eventual decay, assessing, in situ, its durability through the capillary coefficient.

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Fluorescent molecular probe based optical fiber sensor dedicated to pH measurement of concrete

Cited by 36 publications

References 30 publications

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

Organic–inorganic hybrid sol–gel materials doped with a fluorescent triarylimidazole derivative

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste

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