Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete
| Parent link: | Materials Vol. 14, iss. 14.— 2021.— [4011, 34 p.] |
|---|---|
| Main Author: | |
| Corporate Authors: | , |
| Other Authors: | , |
| Summary: | Title screen It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1 < ε˙ < 100 s−1) is also characterized by the presence of a peculiar mechanism of interstitial water effect on the concrete fracture and compressive strength. Using computer simulations, we have shown that such a mechanism is the competition of two oppositely directed processes: deformation of the pore space, which leads to an increase in pore pressure; and pore fluid flow. The balance of these processes can be effectively characterized by the Darcy number, which generalizes the notion of strain rate to fluid-saturated material. We have found that the dependence of the compressive strength of high-strength concrete on the Darcy number is a decreasing sigmoid function. The parameters of this function are determined by both low-scale (capillary) and large-scale (microscopic) pore subsystems in a concrete matrix. The capillary pore network determines the phenomenon of strain-rate sensitivity of fluid-saturated concrete and logistic form of the dependence of compressive strength on strain rate. Microporosity controls the actual boundary of the quasi-static loading regime for fluid-saturated samples and determines localized fracture patterns. The results of the study are relevant to the design of special-purpose concretes, as well as the assessment of the limits of safe impacts on concrete structural elements. |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://earchive.tpu.ru/handle/11683/74811 https://doi.org/10.3390/ma14144011 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668159 |
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| 200 | 1 | |a Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete |f E. V. Shilko, I. S. Konovalenko, I. S. Konovalenko | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 87 tit.] | ||
| 330 | |a It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1 < ε˙ < 100 s−1) is also characterized by the presence of a peculiar mechanism of interstitial water effect on the concrete fracture and compressive strength. Using computer simulations, we have shown that such a mechanism is the competition of two oppositely directed processes: deformation of the pore space, which leads to an increase in pore pressure; and pore fluid flow. The balance of these processes can be effectively characterized by the Darcy number, which generalizes the notion of strain rate to fluid-saturated material. We have found that the dependence of the compressive strength of high-strength concrete on the Darcy number is a decreasing sigmoid function. The parameters of this function are determined by both low-scale (capillary) and large-scale (microscopic) pore subsystems in a concrete matrix. The capillary pore network determines the phenomenon of strain-rate sensitivity of fluid-saturated concrete and logistic form of the dependence of compressive strength on strain rate. Microporosity controls the actual boundary of the quasi-static loading regime for fluid-saturated samples and determines localized fracture patterns. The results of the study are relevant to the design of special-purpose concretes, as well as the assessment of the limits of safe impacts on concrete structural elements. | ||
| 461 | |t Materials | ||
| 463 | |t Vol. 14, iss. 14 |v [4011, 34 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a water-saturated concrete | |
| 610 | 1 | |a two-scale porosity | |
| 610 | 1 | |a permeability | |
| 610 | 1 | |a fluid filtration | |
| 610 | 1 | |a dynamic loading | |
| 610 | 1 | |a fracture | |
| 610 | 1 | |a compressive strength | |
| 610 | 1 | |a computer simulation | |
| 610 | 1 | |a discrete element method | |
| 610 | 1 | |a coupled poroelastic model | |
| 610 | 1 | |a бетон | |
| 610 | 1 | |a пористость | |
| 610 | 1 | |a проходимость | |
| 610 | 1 | |a фильтрация | |
| 610 | 1 | |a динамическая нагрузка | |
| 610 | 1 | |a прочность на сжатие | |
| 610 | 1 | |a компьютерное моделирование | |
| 700 | 1 | |a Shilko |b E. V. |c physicist |c engineer of Tomsk Polytechnic University, Doctor of physical and mathematical sciences |f 1973- |g Evgeny Viktorovich |3 (RuTPU)RU\TPU\pers\35909 | |
| 701 | 1 | |a Konovalenko |b I. S. |c physicist |c Associate Professor of Tomsk Polytechnic University, candidate of physical and mathematical sciences |f 1980- |g Igor Sergeevich |3 (RuTPU)RU\TPU\pers\35818 |9 18963 | |
| 701 | 1 | |a Konovalenko |b I. S. |c Physicist |c Associate Professor of Tomsk Polytechnic University, Candidate of physical and mathematical sciences |f 1980- |g Ivan Sergeevich |3 (RuTPU)RU\TPU\pers\37812 |9 20526 | |
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| 856 | 4 | |u https://doi.org/10.3390/ma14144011 | |
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