4D characterisation of damage and fracture mechanisms of ultra high performance fibre reinforced concrete by in-situ micro X-Ray computed tomography tests

Yang, Zhenjun; Qsymah, Ansam; Peng, Yong; Margetts, Lee; Sharma, Rajneesh

doi:10.1016/j.cemconcomp.2019.103473

Cited by 46 publications

(10 citation statements)

References 35 publications

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“…16c), the fibre is fully pulled out from the matrix with a slip of 1.80 mm. Because the embedment length is short at the right end, this fibre is slightly bent at the left exit point only, which is consistent with the finding in [24].…”

Section: μXct Image Processing Segmentation and Statistical Analysessupporting

confidence: 89%

“…18, where the fibre forces the crack to propagate along the fibre-matrix interface. This so called 'pseudo-debonding' phenomenon [34] is also noted in [24] where insitu μXCT tests of UHPFRC specimen under wedge-split loading is reported.…”

Section: μXct Image Processing Segmentation and Statistical Analysesmentioning

confidence: 63%

“…Although μXCT has been used to visualise internal micro-structures and analyze fracture mechanisms of a wide range of materials, such as metal composite material [12], carbon fibre reinforced polymers [13], ceramic matrix composite [14], plain concrete [15], foamed concrete [16], and fibre reinforced concrete (FRC) [17][18][19][20][21][22][23], 4D μXCT studies of composites are still very limited, due to the lack of in-situ μXCT facilities and high costs of performing such tests. Our recent study [24] appears to be the only reported 4D μXCT tests of UHPFRC materials, which has demonstrated the powerful capability of this method in visualising and analysing the complicated deformation and failure process of UHPFRC, especially the effects of fibre crack-bridging and orientation.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Ex-situ micro X-ray computed tomography tests and image-based simulation of UHPFRC beams under bending

Zhang

Yang

Pang

et al. 2021

Cement and Concrete Composites

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Section: μXct Image Processing Segmentation and Statistical Analysessupporting

confidence: 89%

Section: μXct Image Processing Segmentation and Statistical Analysesmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Ex-situ micro X-ray computed tomography tests and image-based simulation of UHPFRC beams under bending

Zhang

Yang

Pang

et al. 2021

Cement and Concrete Composites

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“…SDT such as pull out test, pull off test, computer tomography,chloride test etc 1,2 . is popular techniques to examine bond strength of steel fibers, 3 study interface between steel fiber and cementitious matrix, 4 characterize internal microstructure, 5 and evalaute behavior of bridge connections 6 . NDT based on vibration methods, imaging techniques, and nonlinear ultrasonic testing has been successfully applied to monitor deep foundation piles, 7 diagnose nonlinear effects in aircraft engines, 8 understand the behavior of transmission line conductors in field conditions by evaluating natural frequencies, 9 detect damage in fiber‐reinforced polymer‐bonded structures, 10 and describe modulated sidebands in metallic and carbon fiber‐reinforced polymer specimens 11 .…”

Section: Introductionmentioning

confidence: 99%

Smart monitoring of strengthened beams made of ultrahigh performance concrete using integrated and nonintegrated acoustic emission approach

Prem

Verma

Murthy

et al. 2021

Struct Control Health Monit

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Summary Ultrahigh performance concrete (UHPC) is one of the recent advancements in construction building materials and popularly used as a precast applications or strengthening material. The current paper attempts to improve understanding about fracture and failure mechanisms of UHPC application as a strengthening material using acoustic emission (AE) technique. The paper proposes an integrated and nonintegrated approach to relate the mechanical energy with AE energy for (i) undamaged reinforced concrete (RC) beams and (ii) damaged RC beams strengthened with UHPC. The integrated approach evaluates the damage mechanisms by evaluating sentry function (logarithmic ratio of mechanical and acoustic energy), while nonintegrated approach considers superimposition of flexure and AE response, load versus AE energy behavior and damage index. To validate the proposed approach, experiments are conducted on (i) control RC beams and (ii) RC beams strengthened with UHPC layers of t, 1.5t, and 2t thickness (where t = 10 mm). From the study, it is found that analysis of structures using both the approaches can overcome corresponding limitations. Hence, to completely characterize the damage, both methods are recommended.

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“…1, relatively higher than CA thereby arresting the crack growth [13]. As the specimen peak stress is reached, the strength of bridging material governs the propagation of cracks [14] In the design of a superior construction material, understanding the mechanics of crack initiation, growth, leading to fracture is critical. To study these mechanisms, In-house test methods such as three-point bend test, uniaxial tension test and WST are widely used.…”

Section: Introductionmentioning

confidence: 99%

Visualization and quantification of aggregate and fiber in self-compacting concrete using computed tomography for wedge splitting test

Rajeshwari

Sivakumar

Praneeth³

2020

Archiv.Civ.Mech.Eng

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Wedge splitting test gained popularity as a stable and simple method to predict the fracture mechanism properties of concrete specimens. The present research focuses on understanding the behavior of self-compacting concrete specimens made with and without steel fibers tested using wedge splitting test, later scanned under high resolution computed tomography. The contribution of hooked end steel fiber and coarse aggregates in fiber reinforced specimens was compared without steel fiber reinforced concrete specimens using high resolution computed tomography. As fracture takes place across the plane perpendicular to the splitting force, i.e. along the depth of specimens. High resolution computed tomography technique was adopted in visualizing the changes taking place across the matrix, coarse aggregate and steel fibers, along with the specimen's depth. Datasets of the images, obtained from computed tomography, after images analysis and volume reconstruction, revealed a higher coarse aggregate and steel fiber participation in the failure region of without and with fibers specimens. Computed tomography investigation indicated a total of 23 coarse aggregate and 64 steel fibers participated in resisting the failure, during wedge splitting test of without and with fibers specimens. Therefore, high resolution computed tomography can be used in understanding, quantifying the participation of coarse aggregate and steel fiber in the failure plane, under fracture loads.

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4D characterisation of damage and fracture mechanisms of ultra high performance fibre reinforced concrete by in-situ micro X-Ray computed tomography tests

Cited by 46 publications

References 35 publications

Ex-situ micro X-ray computed tomography tests and image-based simulation of UHPFRC beams under bending

Ex-situ micro X-ray computed tomography tests and image-based simulation of UHPFRC beams under bending

Smart monitoring of strengthened beams made of ultrahigh performance concrete using integrated and nonintegrated acoustic emission approach

Visualization and quantification of aggregate and fiber in self-compacting concrete using computed tomography for wedge splitting test

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