Detection and Measurement of Matrix Discontinuities in UHPFRC by Means of Distributed Fiber Optics Sensing

Sawicki, Bartłomiej; Bassil, Antoine; Brühwiler, E.; Chapeleau, Xavier; Leduc, Dominique

doi:10.3390/s20143883

Cited by 8 publications

(9 citation statements)

References 46 publications

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“…It is important to mention that the SensoLux cable is the least sensitive to microcracks among the chosen FO cables, as it is characterized by low value of the strain lag parameter k [19]. The variation of strain measured with extensometers provoked by microcracking is clearly visible and in accordance with [14] as well as with [11,26,27]. While EXT1, 2 and 4 show good agreement with T2 fiber measurements, EXT3 shows higher strain.…”

Section: Strain Distribution In the Beammentioning

confidence: 66%

“…The LunaÒ High-Definition Polyimide coating fiber of diameter Ø155 lm was glued to the flat surface of longitudinal rib from both sides of rebar before casting. Same type of fiber, as well as the SMF-28 ThorlabsÒ Ø900 lm fiber with elastomer tubing, were glued to the surface of UHPFRC in a previously prepared groove, as described in detail in [14]. The SensoLux cable Ø2000 lm was directly embedded in UHPFRC during casting.…”

Section: Methodsmentioning

confidence: 99%

“…In this work, 21 microcracks were observed. This measurement method was developed and described in detail in [19] and demonstrated for UHPFRC in [14]. For the sake of brevity, the theoretical background is not presented here.…”

Section: Methodsmentioning

confidence: 99%

“…However, DFOs proved their usefulness for fatigue monitoring of strain [12] and crack opening [13] in reinforced concrete. They allow for detection and measurement of microcrack opening in UHPFRC as well [14].…”

Section: Introductionmentioning

confidence: 99%

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Deformational behavior and damage mechanism of R-UHPFRC beam subjected to fatigue loading

2021

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The fatigue behavior of a reinforced UHPFRC (Ultra High Performance Fiber Reinforced Cementitious composite) T-shaped beam under four-point bending is investigated. The beam was subjected to a fatigue loading range equal to 49% of the static resistance and failed after 0.88 million cycles. It was instrumented with extensometers, strain gauges and distributed fiber optic sensors for strain monitoring. The fatigue process consists of three stages: with rapid, stable and again rapid growth of strains during 10%, 80% and 10% of total number of fatigue cycles, respectively. Except of the first 10%, this process takes place locally; therefore, it cannot be followed with the deflection measurement. During the stable stage, growth of strain occurs at minimum loading level in the fatigue cycle, indicating a fatigue damage process under tensile-compressive response of UHPFRC. Advanced fatigue crack propagation in the reinforcement bar determines the location of rupture of the beam. When the remaining cross-section of the rebar does not suffice to carry the tensile load, stress is transmitted to the encompassing UHPFRC causing its fast deterioration. Complete rupture of the rebar occurs only at the end of the test, when the beam collapses.

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Section: Strain Distribution In the Beammentioning

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformational behavior and damage mechanism of R-UHPFRC beam subjected to fatigue loading

2021

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“…Sawicki et al [ 68 ] proceeded to validate the performance of DOFS (integrated with DIC and extensometers) for the SHM of Ultra-High-Performance Fiber-Reinforced Cementitious composites (UHPFRC). In particular, a full-scale UHPFRC beam was instrumented with three lines of OFDR DOFS positioned inside 2 × 2 mm grooves present on each face of the beam (the fibers were glued in place with a bi-component epoxy adhesive).…”

Section: Laboratory Experimental Applicationsmentioning

confidence: 99%

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

Bado

Casas

2021

Sensors

203

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The present work is a comprehensive collection of recently published research articles on Structural Health Monitoring (SHM) campaigns performed by means of Distributed Optical Fiber Sensors (DOFS). The latter are cutting-edge strain, temperature and vibration monitoring tools with a large potential pool, namely their minimal intrusiveness, accuracy, ease of deployment and more. Its most state-of-the-art feature, though, is the ability to perform measurements with very small spatial resolutions (as small as 0.63 mm). This review article intends to introduce, inform and advise the readers on various DOFS deployment methodologies for the assessment of the residual ability of a structure to continue serving its intended purpose. By collecting in a single place these recent efforts, advancements and findings, the authors intend to contribute to the goal of collective growth towards an efficient SHM. The current work is structured in a manner that allows for the single consultation of any specific DOFS application field, i.e., laboratory experimentation, the built environment (bridges, buildings, roads, etc.), geotechnical constructions, tunnels, pipelines and wind turbines. Beforehand, a brief section was constructed around the recent progress on the study of the strain transfer mechanisms occurring in the multi-layered sensing system inherent to any DOFS deployment (different kinds of fiber claddings, coatings and bonding adhesives). Finally, a section is also dedicated to ideas and concepts for those novel DOFS applications which may very well represent the future of SHM.

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A Novel Approach to Surface Strain Measurement for Cylindrical Rock Specimens Under Uniaxial Compression Using Distributed Fibre Optic Sensor Technology

et al. 2021

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This study proposes a novel approach to surface strain measurement for cylindrical rock specimens subjected to uniaxial compression using distributed fibre optic sensing technology. The capability and accuracy of this approach in measuring the full-field strain distribution of a rock specimen have been verified by a series of uniaxial compressive strength (UCS) tests on cylindrical specimens of aluminium alloy, sandstone, and granite. By analysing the experimental results, this new approach also has the potential of being utilized to detect the potential failure locations and sequence through strain localization zone variations and estimation of the development of crack opening displacement and rock fracturing characteristics during the loading and unloading process. Detailed installation procedures are provided for this study for assistance in the use of this new approach. The boundary issue of fibre measurements is identified, and solved by extending the bonding length of the measuring fibre.

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Detection and Measurement of Matrix Discontinuities in UHPFRC by Means of Distributed Fiber Optics Sensing

Cited by 8 publications

References 46 publications

Deformational behavior and damage mechanism of R-UHPFRC beam subjected to fatigue loading

Deformational behavior and damage mechanism of R-UHPFRC beam subjected to fatigue loading

A Review of Recent Distributed Optical Fiber Sensors Applications for Civil Engineering Structural Health Monitoring

A Novel Approach to Surface Strain Measurement for Cylindrical Rock Specimens Under Uniaxial Compression Using Distributed Fibre Optic Sensor Technology

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