Monitoring of the fracture mechanisms induced by pull-out and compression in concrete

Mpalaskas, A. C.; Vasilakos, Ioannis; Matikas, Theodore E.; Chai, Hwa Kian; Aggelis, D. G.

doi:10.1016/j.engfracmech.2014.07.020

Cited by 36 publications

(17 citation statements)

References 33 publications

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“…During pull-out process the fibers are subjected to tensile force, which works to pull the fiber out of the concrete, whereas an interfacial bond stresses work to resist that subjected tensile force by fully bond stresses in first phase, followed by debonding as second phase, then frictional sliding as final pull-out phase [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Khabaz

2016

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Khabaz

2016

Construction and Building Materials

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“…As already mentioned, the design at hand may suffer from several different fracture mechanisms: tensile cracking of the GFR.IPC box, debonding between the GFR.IPC box and concrete, cracking or crushing of concrete and -in case a carbon strip is attached-debonding between the strip and In several materials, and concrete in particular, signals with high frequency indicators (average frequency, AF) and short rise time (RT, see Fig. 10), indicate fracture events of tensile character while when signals become longer this usually implies a shift to a more shear character including delaminations and fibre pull-out [24,28,29]. This is also expressed by an increase of "RA" which is the ratio of RT over amplitude and it measures the inverse of the initial rising angle of the waveform (see again Fig.…”

Section: Acoustic Emission Testsmentioning

confidence: 99%

Experimental Structural Analysis of Hybrid Composite-Concrete Beams by Digital Image Correlation (DIC) and Acoustic Emission (AE)

et al. 2015

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The use of composites such as textile reinforced cements (TRCs) and fibre reinforced polymers (FRPs) enables the development of lightweight structures. Such a lightweight solution for floor renovation consists of a hybrid composite-concrete cross section: prefabricated beams (TRC-CFRP reinforced hollow boxes with concrete on top) support sandwich panels together with a finishing concrete compression layer creating a monolithic hybrid floor. As the hybrid beams are the main structural element of this floor system, their load-bearing and failure behaviour should be fully understood. In order to examine the optimal design of these structures in terms of load bearing capacity, the beams are separately tested in four point bending while the amount of CFRP reinforcement and the concrete thickness are varied. The digital image correlation (DIC) and acoustic emission (AE) measuring techniques are applied in a complimentary way to monitor the bending and failure behaviour of the full scale hybrid beams. DIC visualises the development of surface strain fields together with the exact cracking patterns in relation to the applied load. AE contributes in defining the load at the onset of serious cracking activity. Furthermore, AE characterizes the contribution of the different fracture modes that may vary from concrete cracking, delamination between the successive layers of the TRC or debonding at the interphase between the TRC hollow box and the concrete on the one hand and the CFRP on the other hand. B S. Verbruggen svetlana.verbruggen@vub.ac.be

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“…[13,14]. Despite the numerous articles in this scientific field, the provided AE data are usually not sufficient to solely characterize the structural health of the matrix and another technique is required to cross-plot the necessary information [15,16]. In this study, the exploitation of different types of advanced fibers made from polyvinyl alcohol (PVA) reinforced with carbon nanotubes (CNTs) for sensing the mechanical performance of the cement mortar used for the restoration of Acropolis' Parthenon will be investigated.…”

Section: Introductionmentioning

confidence: 99%

Strain monitoring of cement-based materials with embedded polyvinyl alcohol - carbon nanotube (PVA-CNT) fibers

Metaxa

Néri

Poulin

et al. 2017

Frattura Ed Integrità Strutturale

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ABSTRACT. This article investigates the possibility of exploiting innovative polyvinyl alcohol fibers reinforced with carbon nanotubes (PVA-CNT fiber) as a strain sensor in cement mortars used in the restoration of Cultural Heritage Monuments. Two types of PVA-CNT fibers were embedded in the matrix at a short distance from the bottom of the beam and their readings were correlated with traditional sensors, e.g. strain gauges and Fiber Optic Bragg Gratings. The Electrical Resistance Change (ERC) of the embedded PVA-CNT fiber was in-situ monitored during four-point bending mechanical tests. For the case of coated PVA-CNT fiber, a linear correlation of the applied strain at the bottom surface of the specimen along with ERC values of the fiber was noticed for the low strain regime. For the case of incremental increasing loading -unloading loops, the coated and annealed PVA-CNT fiber gave the best results either as embedded or as 'surface attached' sensor that exhibited linear correlation of ERC with applied strain for the low applied strain regime as well as hysteresis loops during unloading. The article discusses their high potential to be exploited as strain/damage sensor in applications of civil engineering as well as in restoration of Monuments of Cultural Heritage.

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Monitoring of the fracture mechanisms induced by pull-out and compression in concrete

Cited by 36 publications

References 33 publications

Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Monitoring of impact of hooked ends on mechanical behavior of steel fiber in concrete

Experimental Structural Analysis of Hybrid Composite-Concrete Beams by Digital Image Correlation (DIC) and Acoustic Emission (AE)

Strain monitoring of cement-based materials with embedded polyvinyl alcohol - carbon nanotube (PVA-CNT) fibers

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