Influence of Humidity of Concrete on Its Deformation Diagrams under Load at Low Negative (up to -70°C) Temperatures

Karpenko, N. I.; YARMAKOVSKY, V.N.; KADIEV, D.Z.

doi:10.31659/0585-430x-2017-749-6-10-13

Cited by 6 publications

(6 citation statements)

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“…Taking into account the foregoing, the degree of influence of the variable stressed state of concrete at σ max <R 0 T on its frost resistance can be reduced at the corresponding humidity conditions of the reinforced concrete structure exploitation. This is confirmed by the results of experimental investigations carried out by the authors and the mathematical calculations given below, obtained under processing of the data on the influence of concrete moisture on the diagrams of its deformation under load at the corresponding low negative temperatures [13,14].…”

Section: On Thesupporting

confidence: 72%

“…Thus, the processing of the experimental investigations results of concrete with different natural moisture content and various water-cement ratio (W/C) under axial compression loads showed that at W/C=0,4 and moisture content change in the range from W=3,1% to W=4,9%, not exceeding the limiting value W lim =5,11% (corresponding to the excess of the limiting degree of water saturation of pores and capillaries of cement stone -ξ cr >90%), shows the following. It can be accepted for application in the diagram calculation method of reinforced concrete structures [13,14], derived by the authors of this article, the dependence of the change of elasticity modulus of concrete under the action of low negative temperatures, determined in the range from +20 °С to -70 °С, taking in account the coefficient of moisture content according to the formula:…”

Section: On Thementioning

confidence: 99%

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Influence of Variable Stress State of Concrete on its Frost Resistance

Karpenko

YARMAKOVSKY

KADIEV

2019

MSF

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Test results of concrete under the conditions of simultaneous action of multiply repeated loads of axial compression and cyclic freezing at different temperatures are given. It is established that such variable stress state of concrete under the condition σmax<R0T (where σmax is the maximum stress of the loading cycle and R0T is the stress level determining the lower boundary of the microcrack formation region of concrete) can increase its frost resistance. This is only true if the degree of water saturation of gel pores and pore capillaries of concrete does not exceed a critical value – more than 90% by volume. The results of the investigations of the structural and technological characteristics of concrete (water-cement ratio, moisture content, differential porosity, ice content, determined by calorimetric and ultrasonic methods), frozen to temperatures down to minus 70 °C, confirm the validity of the conclusions about the effect of the variable stressed state of concrete on its frost resistance.

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Section: On Thesupporting

confidence: 72%

Section: On Thementioning

confidence: 99%

Influence of Variable Stress State of Concrete on its Frost Resistance

Karpenko

YARMAKOVSKY

KADIEV

2019

MSF

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“…In recent years, one of the promising areas for the development of methods for calculating reinforced concrete structures is the use of a deformation model. The diagram method is widely used in the design of reinforced concrete structures and has broad prospects for the dissemination of a uniform approach that allows us to evaluate elements simultaneously by bearing capacity and stiffness, to include in the design model different in nature and intensity of load and impact [4][5][6][7][8][9][10][11][12][13][14]. The purpose of this article is to develop a diagrammatic method for evaluating the effectiveness of concrete when strengthening structures under load.…”

Section: Introductionmentioning

confidence: 99%

“…be adopted, presented in domestic and foreign design standards and in scientific literature. This article adopts the state diagram described in [5], later included in domestic design standards and developed for various cases of loading and impact [6][7][8]. The relationship of stress and strain is established by the equation:…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Structures’ Reinforcement Effectiveness Based on Non-Linear Concrete State Diagrams

Toshin

2019

MSF

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The article describes a diagrammatic method for evaluating the effectiveness of strengthening structures under load. As an indicator of efficiency, a parameter is introduced that is set as the level of reinforcement loading of concrete by the beginning of the reinforced structure’s concrete destruction. The nonlinear deformation diagrams show the sequence of development and redistribution of stresses in the sections of the conditional inflexible concrete element, amplified without removing the load. The results of the practical calculation of the gain under load for some variations of the strength and the deformative characteristics of concrete are given. The data obtained indicate the possibility of applying the proposed methodology to the evaluation of the strengthening structures effectiveness without removing the load.

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“…The calculated dependencies of the method were formed on the basis of the numerous experimental data, which ultimately ensured sufficient reliability of the design decisions made. Further development of the design standards for reinforced concrete elements was facilitated by a more detailed study of the laws of nonlinear deformation of concrete and steel reinforcement under load [1][2][3][4][5] with the receipt of complete diagrams of the materials state.…”

Section: Introductionmentioning

confidence: 99%

Perspectives of the Application for the Nonlinear Deformation Model in the Calculations of Reinforced Concrete Elements

Toshin

2019

MSF

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The perspective directions of the calculation method applied application based on the nonlinear deformation model are presented. Some examples of the elements reinforced sections calculation applicability method with flexible, rigid steel reinforcement, composite reinforcement are given as well as the application of this method for the calculation of the uneven distribution of the strength and deformative characteristics of concrete and other damage to reinforced concrete structures; for the gain structure design, including the non-removing load; to assess the stiffness and carrying capacity of the elements with composite sections of various combinations of materials; for the calculation of the effect of repeated, alternating loads. To a large extent, the possibility of a broad application of the nonlinear deformation model is provided by the flexible form of mathematical writing of expressions for determining stiffness characteristics, which are transformed to the requirements of the solved problem.

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Influence of Humidity of Concrete on Its Deformation Diagrams under Load at Low Negative (up to -70°C) Temperatures

Cited by 6 publications

References 0 publications

Influence of Variable Stress State of Concrete on its Frost Resistance

Influence of Variable Stress State of Concrete on its Frost Resistance

Evaluation of the Structures’ Reinforcement Effectiveness Based on Non-Linear Concrete State Diagrams

Perspectives of the Application for the Nonlinear Deformation Model in the Calculations of Reinforced Concrete Elements

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