On the construction of the diagram of calculation method of rod reinforced concrete structures under the action of low negative temperatures

Karpenko, N. I.; Yarmakovskiy, V N; Karpenko, Sergey N.; KADIEV, D.Z.

doi:10.1088/1757-899x/456/1/012003

Cited by 8 publications

(9 citation statements)

References 2 publications

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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: 73%

“…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: 73%

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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“…По [4] для обеспечения долговечности применяются добавки, повышающие водонепроницаемость и морозостойкость бетона, усиливающие его биостойкость и защиту стали от коррозии.…”

Section: кв шулдяков ля крамар бя трофимов ам махмудовunclassified

“…Классификация агрессивных воздействий, снижающих долговечность железобетонных конструкций, приведена в [4]:…”

Section: Introductionunclassified

Structure and Properties of Hardened Cement Paste With Modifying Agents

Shuldyakov¹,

Kramar²,

Trofimov³

et al. 2020

build

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Рис. 6. Рентгенограмма цементного камня с добавкой 1 % АСЕ Рис. 7. Электронная микрофотография цементного камня с 1 % АСЕ Рис. 8. Электронный микроснимок цементного камня с добавкой 1 % АСЕ и 12 % МК Рис. 9. Электронный микроснимок цементного камня, модифицированного добавкой 1 % СП-1

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“…A lot of scientific works are devoted to questions of practical and philosophical longevity. In work [2] modern approaches to the evaluation of technical durability are described in sufficient details. In particular, it is proposed to introduce into the design standards a calculation based on a new limit state -durability.…”

Section: Models Of Durability Of Buildingsmentioning

confidence: 99%

Durability of Buildings in Urban Environment

Varlamov

Rimshin²,

Tverskoi

2018

MSF

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The longevity forecast is proposed to be implemented on the basis of models of degradation theory. The theory of degradation is developed as a general energy method for estimating the longevity of objects. It is based on the law of conservation of energy. To analyze the longevity of urban environment, it is proposed to adopt the simplest model of theory of degradation. The proposed work provides an explanation for the description of proposed model. The urban environment is divided into a number of simpler systems. The more the degree of system separation into simpler ones, the more accurately one can describe the behavior of the entire system in time. Each simple system is described by the simplest model of degradation theory. The general behavior of the system is understood as a simple sum of individual degradation models. A feature of the proposed theory is that the simplest model can describe the entire system or the sum of its individual parts at once. The model makes it possible to consider the issue of equalizing the longevity of individual systems. The analysis of durability of a multicompartment building is taken as an example. In terms of analyzing the given example, individual stages of systems operation, that are still subject to discussion, are identified.

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On the construction of the diagram of calculation method of rod reinforced concrete structures under the action of low negative temperatures

Cited by 8 publications

References 2 publications

Influence of Variable Stress State of Concrete on its Frost Resistance

Influence of Variable Stress State of Concrete on its Frost Resistance

Structure and Properties of Hardened Cement Paste With Modifying Agents

Durability of Buildings in Urban Environment

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