Development of the strain field along the crack in ultra-high-performance fiber-reinforced concrete (UHPFRC) under bending by digital image correlation technique

Niu, Yanfei; Huang, Haoliang; Zhang, Jie; Jin, Wen Cheng; Wei, Jiangxiong; Qin, Yu

doi:10.1016/j.cemconres.2019.105821

Cited by 66 publications

(28 citation statements)

References 22 publications

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“…8. However, reinforcing the concrete with fibres did not induce a pronounced improvement in first-crack load as it is mainly influenced by the matrix strength (Niu et al, 2019). The flexural strength determined based on point B in Fig.…”

Section: Load-deflection Behaviourmentioning

confidence: 89%

“…the blue coloured area), pointing out that very tiny crack was initiated in point A for RS1.0. This further implies that RTSF can better disperse the stress and restrict the crack propagation in the early loading stage (Niu et al, 2019;Onuaguluchi and Banthia, 2018;Skar _ zy nski and Suchorzewski, 2018). Upon reaching the peak load (point B shown in Fig.…”

Section: Load-deflection Behaviourmentioning

confidence: 99%

“…Fig. 11 presents the typical three zones identified in DIC image for tensile strain analysis (Niu et al, 2019). In zone 1 (uniform zone), the cracks are not formed with the lowest longitudinal strain while the fibre slipping often occurs in the zone 2, known as fracture process zone.…”

Section: Load-deflection Behaviourmentioning

confidence: 99%

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Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Zhong

Zhang

2020

Journal of Cleaner Production

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Recycled tyre steel fibre (RTSF) is considered as a potential and sustainable alternative to manufactured steel fibre (MSF), while RTSF resulted in lower energy absorption capacity and more serious corrosion problem in concrete compared to MSF. This paper presents an experimental study on engineering properties of concrete reinforced with hybrid RTSF (0.5%e0.9% V f ) and polypropylene fibre (PPF, 0.1% e0.5% V f ). Results show that combining RTSF with PPF could compensate the serious workability loss caused by RTSF and the workability was improved by 38.9%e66.7%. However, the compressive, splitting tensile and flexural strengths were weakened significantly when PPF was over 0.3% V f in hybrid fibre reinforcement (total content of 1.0% V f ). The strain field shown in digital image correlation images suggests that hybrid RTSF and PPF can create a synergistic effect in restraining the crack growth and the post-cracking behaviour of concrete especially toughness that was enhanced with the presence of PPF. RTSF was more effective in restraining shrinkage of concrete than PPF. With the increase of PPF content in hybrid fibre reinforcement, the chloride migration coefficient of concrete was reduced by 4.9%e6.8% as compared with the mixture reinforced with only RTSF.

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Section: Load-deflection Behaviourmentioning

confidence: 89%

Section: Load-deflection Behaviourmentioning

confidence: 99%

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Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Zhong

Zhang

2020

Journal of Cleaner Production

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“…When the deflection increases to a certain value, the first crack appears. During loading, the limit of proportionality (LOP) is defined as the initial crack strength, and the modulus of rupture (MOR) is defined as flexural strength [ 31 , 32 ]. Figure 5 b shows the equivalent flexural strength of specimens.…”

Section: Resultsmentioning

confidence: 99%

Study of Flexural and Crack Propagation Behavior of Layered Fiber-Reinforced Cementitious Mortar Using the Digital Image Correlation (DIC) Technique

Meng

Liu

et al. 2021

Materials

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By optimizing the distribution of steel fibers in fiber-reinforced cementitious mortar (FRCM) through the layered structure, the role of fibers can be fully utilized, thus improving the flexural behavior. In this study, the flexural behavior of layered FRCM at different thicknesses (25 mm, 50 mm, 75 mm, 100 mm) of the steel fiber layer was investigated. The evolution of the crack propagation behavior was analyzed using the digital image correlation (DIC) technique. The results showed that the steel fiber layer thickness of 75 mm has the best flexural behavior. Moreover, the crack propagation path is more tortuous. The maximum value of crack opening displacement (COM) increases with the increase in fiber thickness. In addition, increasing the bottom layer thickness can increase the height of the tensile zone, but the interface inhibits the increase of the tensile zone.

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“…Compared with the accelerometer method, the DIC measurement method is full-field, non-contact, and convenient. It is also used to measure the surface cracks and deformation of asphalt and concrete structures [ 13 , 14 ]. In recent years, the DIC method has been used to measure the displacement of the actual bridges to obtain the modal parameters and perform damage detection, which validated the effectiveness of the DIC method for field measurement [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Comparisons of Differential Filtering and Homography Transformation in Modal Parameter Identification from UAV Measurement

Zhang

Chen

et al. 2021

Sensors

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This paper proposes a differential filtering method for the identification of modal parameters of bridges from unmanned aerial vehicle (UAV) measurement. The determination of the modal parameters of bridges is a key issue in bridge damage detection. Accelerometers and fixed cameras have disadvantages of deployment difficulty. Hence, the actual displacement of a bridge may be obtained by using the digital image correlation (DIC) technology from the images collected by a UAV. As drone movement introduces false displacement into the collected images, the homography transformation is commonly used to achieve geometric correction of the images and obtain the true displacement of the bridge. The homography transformation is not always applicable as it is based on at least four static reference points on the plane of target points. The proposed differential filtering method does not request any reference points and will greatly accelerate the identification of the modal parameters. The displacement of the points of interest is tracked by the DIC technology, and the obtained time history curves are processed by differential filtering. The filtered signals are input into the modal analysis system, and the basic modal parameters of the bridge model are obtained by the operational modal analysis (OMA) method. In this paper, the power spectral density (PSD) is used to identify the natural frequencies; the mode shapes are determined by the ratio of the PSD transmissibility (PSDT). The identification results of three types of signals are compared: UAV measurement with differential filtering, UAV measurement with homography transformation, and accelerometer-based measurement. It is found that the natural frequencies recognized by these three methods are almost the same. This paper demonstrates the feasibility of UAV-differential filtering method in obtaining the bridge modal parameters; the problems and challenges in UAV measurement are also discussed.

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Development of the strain field along the crack in ultra-high-performance fiber-reinforced concrete (UHPFRC) under bending by digital image correlation technique

Cited by 66 publications

References 22 publications

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres

Study of Flexural and Crack Propagation Behavior of Layered Fiber-Reinforced Cementitious Mortar Using the Digital Image Correlation (DIC) Technique

Comparisons of Differential Filtering and Homography Transformation in Modal Parameter Identification from UAV Measurement

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