Вязкость Разрушения Цементных Материалов, Модифицированных Углеродными Нанотрубками

Zhdanok, S. A.; Полонина, Е. Н.; Sadovskaya, E. A.; Леонович, С. Н.

doi:10.36773/1818-1112-2021-126-3-48-53

Vestnik of Brest State Technical University. Civil Engineering

2021

DOI: 10.36773/1818-1112-2021-126-3-48-53

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Вязкость Разрушения Цементных Материалов, Модифицированных Углеродными Нанотрубками

S. A. Zhdanok¹,

Е. Н. Полонина

E. A. Sadovskaya

et al.

Abstract: In order to increase the fracture toughness of concrete, dispersed fiber reinforcement is increasingly used in practice. The initiation of crack initiation occurs at the nanoscale in the cement matrix. Thus, the use of nano-reinforcement with dispersed nanoparticles can have a positive effect on the fracture toughness of the cement composite. It is proposed to consider carbon nanotubes (CNTs) as such nanofibers.This article discusses the possibility of using nanocarbon tubes as elements for restraining the dev… Show more

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Cited by 3 publications

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Nanofiber Concrete: Multi-Level Reinforcement

Леонович

Sadovskaya

2022

Nauka teh.

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Concrete is the most commonly used building material worldwide. One of its main disadvantages is the fragility of fracture and low crack resistance. The use of dispersed reinforcement of concrete composites is a promising direction in solving this type of problem. Dispersed fibers, evenly distributed over the entire volume of the material, create a spatial frame and contribute to the inhibition of developing cracks under the action of destructive forces. In order to increase the fracture toughness of concrete, dispersed fiber reinforcement is increasingly used in practice. The beginning of crack nucleation occurs at the nanoscale in the cement matrix. Thus, the use of nano-reinforcement with dispersed nanofibers can have a positive effect on the crack resistance of the cement composite. It is proposed to consider carbon nanotubes as such nanofibers. The presence of carbon nanofibers changes the microstructure and nanostructure of cement modified with carbon nanotubes. The result of the processes occurring in capillaries and cracks are deformations in the intergranular matrix, the free flow of which is prevented by rigid clinker grains and nanocarbon tubes, which creates a certain stress intensity at the tips of the separation cracks. The working hypothesis is confirmed that the required fracture toughness of structural concrete is provided by multi-level reinforcement: at the level of the crystalline aggregate of cement stone – carbon nanotubes, and at the level of fine-grained concrete – various macro-sized fibers (steel, polymer). Reinforcement of a crystalline joint with carbon nanotubes leads to an increase in the fracture toughness of the matrix (cement stone) by 20 %, compressive strength by 12 %, and tensile strength in bending by 20 %. When reinforcing at the level of fine-grained concrete, we obtain a composite – nanofibre-reinforced concrete with fracture toughness.

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Nanofiber Concrete: Multi-Level Reinforcement

Леонович

Sadovskaya

2022

Nauka teh.

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Optimization of Composition of Nanofiber Concrete in Terms of Fracture Toughness by Matrix Modifiсation

Sadovskaya

Леонович

2022

Nauka teh.

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Concrete is a quasi-brittle building material that has low tensile strength. The process of its destruction under loading is inhomogeneous, due to the nature of the concrete structure mass, consisting of components with different physical and mechanical properties. Gradual deformation and destruction can be characterized as a process of formation and development of microcracks. The presence of different-sized components in concrete makes it possible to consider its structure as a multi-level system. In this system, each level is a matrix with its own structural inclusions, which play both a structure-forming role and the role of stress concentrators under the action of mechanical loads. The critical stress intensity factor is a good indicator of the crack resistance (fracture toughness) of a material. Nanoconcrete, from the point of view of a multilevel system, is a concrete composite with crack propagation inhibitors at the level of the cementing substance (carbon nanotubes are consi-dered as inhibitors). The presence of fiber fibers at subsequent scale levels allows us to consider concrete as a composite with multi-level dispersed reinforcement (nanofiber concrete). The paper discusses the change of concrete fracture toughness indicator (crack resistance) with dispersed reinforcement of the matrix at different structural levels. The presented for normal separation of notched cubes under eccentric compression with the determination of the stress intensity factor for concrete modified with carbon nanotubes acting as crack propagation inhibitors at the level of cementing substance (nanoconcrete), as well as for nanofiber concrete with dispersed reinforcement at the level of fine-grained concrete. Based on experimental studies by non-equilibrium methods of fracture mechanics, compositions of nanofiber-reinforced concrete of maximum crack resistance (fracture toughness) with different fiber concentrations and several types of matrices modified with nanocarbon additives are proposed in the paper.

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Strength and crack resistance of cement composites under multilevel reinforcement

Zhdanok,

Leonovich,

Sadovskaya

et al. 2023

Dokl. Akad. nauk

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The working hypothesis is confirmed that the required fracture toughness of structural concrete can be provided by multi-level reinforcement: at the level of the crystalline joint of cement stone – carbon nanotubes, and at the level of fine-grained concrete – various macro-sized fiber fibers (steel, polymer). Reinforcement of a crystalline splice with carbon nanotubes leads to an increase in tensile strength by 20 %, an increase in Young’s modulus. With dispersed reinforcement of concrete modified with nanoparticles at the level of fine-grained concrete, the tensile strength increases by 109 %, the critical stress intensity coefficient (crack resistance index) increases by 280 % at normal separation, and by 48 % at transverse shear.

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Вязкость Разрушения Цементных Материалов, Модифицированных Углеродными Нанотрубками

Cited by 3 publications

References 5 publications

Nanofiber Concrete: Multi-Level Reinforcement

Nanofiber Concrete: Multi-Level Reinforcement

Optimization of Composition of Nanofiber Concrete in Terms of Fracture Toughness by Matrix Modifiсation

Strength and crack resistance of cement composites under multilevel reinforcement

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