Research on mechanical characteristics, fractal dimension and internal structure of fiber reinforced concrete under uniaxial compression

Zheng, Di; Song, Weidong; Fu, Jianxin; Xue, Gaili; Li, Jiajian; Cao, Shuai

doi:10.1016/j.conbuildmat.2020.120351

Cited by 66 publications

(20 citation statements)

References 27 publications

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“…Fibre addition is thought to overcome some of these limitations due to their beneficial influence on the mechanical properties of hardened mortar, such as impact resistance, and splitting tensile and flexural strengths [ 3 , 4 , 5 , 6 , 7 ]. Additionally, the improvement of tensile strength, flexural toughness and energy absorption capacity due to fibre addition, as far as the mechanics of cracking propagation are concerned, have been confirmed in the case of the most popular cementitious material—concrete—in numerous experimental [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ] and numerical [ 23 , 24 , 25 , 26 , 27 ] investigations. The latest research programmes in that area are focused mostly on subjects concerning newly developed materials [ 8 , 10 , 20 ], the ecological impact of building materials [ 19 , 22 ] or less typical performance tests [ 18 , 21 ].…”

Section: Introductionmentioning

confidence: 90%

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

et al. 2021

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The results of flexural tests of basalt fibre-reinforced cementitious mortars in terms of flexural strength and the occurrence of the bridging effect are summarised. Mixture proportions and curing conditions were altered for various series. The main parameters concerning mixture proportions were water to cement ratio (w/c), micro-silica and plasticiser addition and fibre dosage (1%, 3% and 6.2% by binder’s mass). Various curing conditions were defined by different temperatures, humidity and time. The influence of the amount of water inside the pores of the hardened cementitious matrix on the flexural strength values, as far as the impact of the alkaline environment on basalt fibres’ performance is concerned, was underlined. The designation of flexural strength and the analysis of post-critical deformations were also performed on the reference series without fibres and with the addition of more common polypropylene fibres. The bridging effect was observed only for the basalt fibre-reinforced mortar specimens with a relatively low amount of cement and high w/c ratio, especially after a short time of hardening. For the lowest value of w/c ratio (equalling 0.5), the bridging effect did not occur, but flexural strength was higher than in the case of non-reinforced specimens. Comparing mortars with the addition of basalt and polypropylene fibres, the former demonstrated higher values of flexural strength (assuming the same percentage dosage by the mass of the binder). Nevertheless, the bridging effect in that case was obtained only for polypropylene fibres.

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Section: Introductionmentioning

confidence: 90%

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

et al. 2021

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“…Basalt fiber reinforced concrete with each fiber content consisting of three-cylin specimens, were tested on a WES-1000b electro-hydraulic universal testing machine accordance with IS Code Standard and the Test Standard for Mechanical Properties of O nary Concrete (GB/T50081-2002) [12,13,25]. In the test results, the arithmetic mean va of 3 specimens was used as the compressive strength value of the group of specimen the difference between the maximum value and the minimum value and the interme ate value was not more than 15% of the intermediate value, the intermediate value w taken as the compressive strength value of the group of specimens.…”

Section: Uniaxial Compression Experimentsmentioning

confidence: 99%

“…Basalt fiber reinforced concrete with each fiber content consisting of three-cylinder specimens, were tested on a WES-1000b electro-hydraulic universal testing machine in accordance with IS Code Standard and the Test Standard for Mechanical Properties of Ordinary Concrete (GB/T50081-2002) [12,13,25]. In the test results, the arithmetic mean value of 3 specimens was used as the compressive strength value of the group of specimens.…”

Section: Uniaxial Compression Experimentsmentioning

confidence: 99%

“…In recent years, with the improvement of computer processing ability, the use of a computer can realize the commands of CT image denoising, filtering, image segmentation, so as to build a three-dimensional model of concrete, which is called digital image processing technology [21][22][23][24]. At present, there is a variety of research on the processing of CT scanning images of fiber reinforced concrete with digital image processing technology, but there is little research on the microstructure of basalt fiber reinforced concrete with this technology [25]. For example, in reference [26], the concrete aggregate, pores, and other structures were extracted using digital image processing technology.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Internal Defects and Fiber Distribution of BFRC Based on the Digital Image Processing Technology

Chen

Jiao

et al. 2021

Crystals

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Adding basalt fiber into concrete can significantly improve its mechanical properties. In order to explore the influence of basalt fiber content on the uniaxial compressive strength and splitting tensile strength of concrete and the mechanism of fiber action, this paper conducts compressive and splitting tensile tests on three kinds of basalt fiber concrete specimens with different fiber content and obtains the relationship between the macro mechanical properties and the fiber content. At the same time, with the help of CT scanning equipment and digital image processing technology, the microstructure of basalt fiber concrete with three groups of fiber content is reconstructed, and the pore, crack, and fiber distribution are quantitatively described using the calculation and processing function of the Avizo reconstruction software. The results show that when the optimal fiber content is 3 kg/m3, the improvement rates of uniaxial compressive strength and splitting tensile strength are 31.9% and 23.7%, respectively. The network structure formed by fiber in concrete has the best compactness and the least number of pores, with an average sphericity of 0.89 and an average pore volume of 20.26 μm3. Through analysis, it was found that the initial defects of basalt fiber concrete exist in the form of pores, and the addition of basalt fiber will destroy the large pore size of concrete, change the pore size distribution, and increase the average sphericity; The distribution of the fiber in the concrete is a three-dimensional network, and the distribution of the fiber in the initial defect distribution area is parallel to the direction of pore arrangement.

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“…In addition to reducing drying shrinkage and cracking, the rest of the variables studied did not show significant changes. Zheng et al (2020) conducted laboratory tests to explore the effects of fibre dosage on the mechanical properties and failure modes of reinforced concrete. Samples with different dosages (0 wt%, 0.4 wt%, 0.8 wt%, or 1.2 wt%; wt=weight fraction) and fibre types (polypropylene, glass and polyacrylonitrile) were prepared and subjected to uniaxial compression tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the mechanical behavior of polypropylene fibre reinforced concrete subjected to monotonic loads

Núñez

Torres-Moreno

Ligas-Fonseca

et al. 2021

Lat. Am. j. solids struct.

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The properties of fibre reinforced concrete were studied under monotonic loads according to Japanese, North American and European codes. Two different types of SIKA polypropylene fibre were with different dosages. One hundred and eighty tests were performed, obtaining resistance to compression, tension, bending, toughness, and energy absorption in the hardened state. The results show that the addition of fibres affects the workability of the concrete mix. The increase in fibre dosage does not affect compressive, tensile, or flexural strength. However, the failure changes from brittle to more ductile, allowing it to reach residual strengths of 50% of the maximum reached and 200% deformation. The dissipated energy increased with increasing fibre dosage. The performance achieved by both fibres was similar, although the optimal dosage was 6 kg/m 3 for type A fibres and 8 kg /m 3 for type B. Therefore, the replacement of flexural reinforcing steel in the foundation slabs of one-story buildings can be performed if adequate dosages are used in compliance with established analytical procedures for industrial floor design.

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Research on mechanical characteristics, fractal dimension and internal structure of fiber reinforced concrete under uniaxial compression

Cited by 66 publications

References 27 publications

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

Flexural Behaviour of Cementitious Mortars with the Addition of Basalt Fibres

Characterization of Internal Defects and Fiber Distribution of BFRC Based on the Digital Image Processing Technology

Experimental study on the mechanical behavior of polypropylene fibre reinforced concrete subjected to monotonic loads

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