Characterization of fracture process in polyolefin fibre-reinforced concrete using ultrasonic waves and digital image correlation

Rucka, Magdalena; Wojtczak, Erwin; Knak, Magdalena; Kurpińska, Marzena

doi:10.1016/j.conbuildmat.2021.122522

Cited by 22 publications

(10 citation statements)

References 41 publications

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“…Additionally, Meza et al reported in [ 69 ] that the addition of 2.7 kg/m 3 of copolymer (l f /d f = 38 mm/2.0 × 0.5 mm) fibers resulted in 6.44% increase of f fl . Finally, Rucka et al in [ 40 ] tested exactly the same type of fibers PM with the dosage equaled to 2 kg/m 3 what resulted in a 6.83% f fl increase. There also exist studies in which the improvement in strength was smaller, even though fibers with similar length and content were used, namely f fl , which increased from 2.96 to 4.41%, depending on the V f in [ 70 ].…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, Bertelsen et al [ 39 ] focused on plastic shrinkage while testing samples with micro synthetic fibers. Finally, under 3PBT, the polyolefin FRC were investigated in [ 40 ] by Rucka et al, and in [ 41 ] by Bhosale and Prakash. Furthermore, one of the reasons for such big popularity of this optical technique is its non-destructive and non-contact character.…”

Section: Introductionmentioning

confidence: 99%

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Flexural Tensile Strength of Concrete with Synthetic Fibers

Blazy

Drobiec

Wolka³

2021

Materials

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Fiber reinforcement is currently most often used in floors, railway sleepers, prefabricated structural elements such as slabs, beams and tanks, and in small architecture elements. Designing elements or structures made of fiber-reinforced concrete requires knowledge of its basic mechanical parameters. In the case of concretes with metallic fibers, the literature can find many tests and standard guidelines regarding compressive, flexural, tensile strength and fracture energy. The properties of concretes with non-metallic fibers are slightly less recognized, especially concretes with new types of polymer fibers. Additionally, the lack of standardized methods of testing concrete with polymer fibers make their application much more difficult. In the article, the possibility of using the EN 14651 standard to assess the flexural tensile strength of concrete with the addition of 2.0 and 3.0 kg/m3 of synthetic fibers with different geometry and form was presented. There was a 5.5–13.5% increase in the flexural tensile strength depending on the mixture type. Moreover, in the case of fiber-reinforced concretes, the ductility was enhanced and the samples were characterized by significant residual flexural tensile strengths. Additionally, from the workability tests it was concluded that after the incorporation of fibers, the consistency class decreased by one, two or three. Nevertheless, the compressive strengths of concrete with and without fibers were very similar to each other, and varied from 58.05 to 61.31 MPa. Moreover, it was concluded that results obtained from three-point bending tests significantly differed from empirical formulas for the calculation of the flexural tensile strength of fiber-reinforced concretes with dispersed steel fibers present in the literature. As a result, the new formula determined by the authors was proposed for concrete with polymer fibers with a nominal fiber content ≤1.0% and slenderness of up to 200. It must be mentioned that the formula gave a very good agreement with studies presented in different literature positions. In addition, an attempt was made to evaluate the strengths of tested mixes in accordance with the Model Code 2010. However, it occurred that the proposed fiber-reinforced concrete mixtures would not be able to replace traditional reinforcement in a form of steel bars. Furthermore, in uniaxial tensile tests, it was not possible to determine the σ–w graphs, and received results for maximum tensile strength did not show the clear influence of fibers incorporation on concrete. Then, the fracture energy enhancement (from about 16 to 22 times) and dependencies: crack mouth opening displacement–deflection; crack mouth opening displacement–crack tip opening displacement; and crack tip opening displacement–deflection were analyzed. Finally, the results from flexural tensile tests were compared with measurements of the surface displacement field obtained through the Digital Image Correlation technique. It was concluded that this technique can be successfully used to determine the crack mouth and crack tip opening displacements with very high accuracy.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexural Tensile Strength of Concrete with Synthetic Fibers

Blazy

Drobiec

Wolka³

2021

Materials

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“…To analyze the present and future of any science, it is essential to build on a specific stage of the evolution of the Homo sapiens species and science in relation to overall global challenges facing society and problems affecting the coexistence of the organic and inorganic world as a whole [1][2][3][4]. Scientific progress occurs in parallel with the development of mankind [5][6][7][8]. Over time, discoveries have been made and inventions have been created that were relevant for a certain period in human evolution [9].…”

Section: Introductionmentioning

confidence: 99%

Self-Healing Construction Materials: The Geomimetic Approach

et al. 2021

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A person spends most of his life in rooms built from various building materials; therefore, the optimization of the human environment is an important and complex task that requires interdisciplinary approaches. Within the framework of the new theory of geomimetics in the building science of materials, the concepts of technogenic metasomatism, the affinity of microstructures, and the possibilities of creating composites that respond to operational loads and can self-heal defects have been created. The article aims to introduce the basic principles of the science of geomimetics in terms of the design and synthesis of building materials. The study’s novelty lies in the concept of technogenic metasomatism and the affinity of microstructures developed by the authors. Novel technologies have been proposed to produce a wide range of composite binders (including waterproof and frost-resistant gypsum binders) using novel forms of source materials with high free internal energy. The affinity microstructures for anisotropic materials have been formulated, which involves the design of multilayered composites and the repair of compounds at three levels (nano-, micro-, macro-). The proposed theory of technogenic metasomatism in the building science of materials represents an evolutionary stage for composites that are categorized by their adaptation to evolving circumstances in the operation of buildings and structures. Materials for three-dimensional additive technologies in construction are proposed, and examples of these can be found in nature. Different ways of applying our concept for the design of building materials in future works are proposed.

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“…At the same time, it becomes possible to Fibers 2021, 9, 64 2 of 13 achieve the target characteristics of static and dynamic strength, impermeability to toxic vapors and gases, as well as durability, which will make it possible to operate structures in extreme conditions and, accordingly, preserve the life and health of people in protective shelters [9][10][11]. Transdisciplinary positions that combine the theoretical foundations and technical justification for the creation of multicomponent composites from the standpoint of reducing the economic and environmental burden, provide the ability to control structure formation in order to achieve high values of operational characteristics [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…A significant effect is provided by the use of secondary aggregate from concrete scrap of demolished buildings and structures [16]. As it was revealed as a result of a literature review [7][8][9][10][11][12][13][14][15], with the acceleration of loading (and hence deformation), the material acquires dynamic strength. A representative parameter of this kind of hardening is the coefficient of dynamic hardening (CDH), which is the ratio of dynamic compressive strength to static one.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

Fediuk

Amran

Klyuev

et al. 2021

Fibers

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The use of fiber in cement materials is a promising and effective replacement for bar reinforcement. A wide range of fiber-reinforced concretes based on composite binders with increased impact strength characteristics have been developed. The synthesized composites included the composite binder made of Portland cement, silica, and carbonate additives. Basalt and steel were used as fibers. The nature of the influence of the composition and manufacturing technology of cement composites on the dynamic hardening coefficient has been established, while the growth of these indicators is achieved by creating a denser interfacial transition zone between the cement paste, aggregate, and fiber as a result of improving the homogeneity of the concrete mixture and controlling the consistency. Workability indicators (slump flow up to 730 mm; spreading time up to a diameter of 50 cm is up to 3 s) allow them to be classified as self-compacting concrete mixtures. An increase in the values of the impact strength coefficient by a factor of 5.5, the dynamic hardening coefficient by almost 70% as a result of interfacial interaction between fibers and binder matrix in the concrete composite, as well as absorption of impact energy by fiber, was revealed. The formula describing the effect of the loading rate on the coefficient of dynamic hardening of fiber-reinforced concrete has been refined. The fracture processes of the obtained materials have been established: after the initiation of primary cracks, the structure of the composite absorbs impact energy for a long time, while in the inelastic range (the onset of cracking and peak loads), a large number of secondary cracks appear.

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Characterization of fracture process in polyolefin fibre-reinforced concrete using ultrasonic waves and digital image correlation

Cited by 22 publications

References 41 publications

Flexural Tensile Strength of Concrete with Synthetic Fibers

Flexural Tensile Strength of Concrete with Synthetic Fibers

Self-Healing Construction Materials: The Geomimetic Approach

Increasing the Performance of a Fiber-Reinforced Concrete for Protective Facilities

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