Microstructural analyses of the addition of PP fibres on the fracture properties of high-strength self-compacting concrete by X-ray computed tomography

Ríos, José D.; Mínguez, Jesús; Concha, Antonio Martínez-De La; Cabrera, Miguel; Cifuentes, Héctor

doi:10.1016/j.conbuildmat.2020.120499

Cited by 16 publications

(4 citation statements)

References 60 publications

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“…Through the compression test, the compression strength curves of six fiber dosages were obtained, which were in the shape of a parabola [25,26], with the opening facing down, as shown in Figure 8. When the fiber dosage was 3 kg/m 3 , the peak compression strength was 44.4 MPa, which is much higher than that of plain concrete, and the increased rate of compression strength was 41.85%.…”

Section: Unconfined Compression Testmentioning

confidence: 99%

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

et al. 2022

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The macroscopic aspects of adding basalt fiber (BF) to concrete has been the subject of studies that document great increases in compression strength. Research into the microscopic aspects of the reinforcement mechanism is still in an exploratory stage, and the quantitative analysis and visual observation of fibers in the concrete matrix are difficult. In this paper, the reinforcement effect of fiber on concrete is studied by means of computed tomography (CT) scanning technology and digital image processing (DIP) technology, combined with the macro-mechanical properties obtained from the unconfined compression strength test, and quantitative analysis from the micro point of view. At the same time, the fiber visualization is realized with the help of Avizo. The results show that with the increase in fiber dosage, the peak stress of concrete first increases and then decreases. When the fiber dosage is 3 kg/m3, the peak stress is 44.4 MPa, which is 41.85% higher than that of ordinary concrete. Additionally, the proportion of macropores is the least, which is the best fiber dosage. It is found that when the fiber dosage is 3 kg/m3, the angular distribution of φ is relatively uniform, and the uniform distribution of fibers forms a dense network structure, which significantly increases the peak stress of concrete. However, when the fiber dosage is too high, it will lead to the accumulation of fibers and produce macropores, and these excess fibers mainly appear in the horizontal direction and do not contribute to the compression strength.

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Section: Unconfined Compression Testmentioning

confidence: 99%

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

et al. 2022

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“…For this reason, in recent years it has become established as the reference technique for assessing the geometric and morphological parameters of fibers within the concrete matrix (Balazs et al, 2017;González et al, 2020;Herrmann et al, 2016;Oesch et al, 2018;Ponikiewski & Katzer, 2016;Ríos et al, 2020;Ruan & Poursaee, 2019;Vicente et al, 2018). Among its many advantages, some of which have already been mentioned, is that of being a non-destructive method (Mena et al 2020;Vicente et al, 2014Vicente et al, , 2017Vicente et al, , 2021.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Orientation on the Fatigue Behavior of Steel Fiber-Reinforced Concrete Specimens by Performing Wedge Splitting Tests and Computed Tomography Scanning

González,

Mena-Alonso,

Mínguez

et al. 2024

Int J Concr Struct Mater

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This paper shows the relationship, in steel fiber-reinforced concrete, between fiber orientation and fatigue response through the combined use of computed tomography (CT), digital image processing (DIP) software and wedge splitting test (WST). The WST cubes were extracted from conventional 150 × 150× 600 concrete prisms and a groove and notch were carved on different faces in such a way that in half of the test specimens the fibers are oriented mostly perpendicular to the breaking surface and, in the other half, the fibers are mostly oriented parallel to the breaking surface. Fiber orientation was obtained using a CT device and DIP software from a miniprism extracted from the previously mentioned concrete prisms. The results show that there is a strong correlation between the crack-sewing fiber orientation on the one hand and fatigue life and crack opening rate per cycle on the other hand. Cubes with a higher percentage of fibers perpendicular to the crack surface (i.e., with a higher efficiency index) show a longer fatigue life and a lower crack opening rate per cycle, while cubes with a lower efficiency index show a shorter fatigue life and a higher crack opening rate per cycle.

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“…This in-situ (simultaneous scanning and loading) or ex-situ (scanning after loadingunloading cycles) approach, sometimes called 4D imaging [11], makes accurate investigation of failure modes at small length scales possible. 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: 99%

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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Microstructural analyses of the addition of PP fibres on the fracture properties of high-strength self-compacting concrete by X-ray computed tomography

Cited by 16 publications

References 60 publications

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

Effect of Fiber Orientation on the Fatigue Behavior of Steel Fiber-Reinforced Concrete Specimens by Performing Wedge Splitting Tests and Computed Tomography Scanning

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

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