Evaluation of the frost resistance of concrete in real operating conditions

Lapovska, Svitlana Davydivna; Krasnianskyi, Grygorii; Klapchenko, V. I.; Aznaurian, Iryna

doi:10.1088/1757-899x/907/1/012039

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Наразі у розвитку вирішення аналізованого завдання розроблено методику, в якій оцінку морозостійкості бетону визначають на основі інформації про кінетику дифузії вологи й утворення льоду в порах бетону при дії циклів "заморожування -відтавання". Таку інформацію одержують на основі вимірювань кондуктометричним методом [4]. Показано, що використання цього методу дозволяє встановити швидкість дифузії води та фронту утворення льоду, а також глибину промерзання зразків бетону, відповідну цим параметрам.…”

Section: аналіз останніх досліджень і публікаційunclassified

Justification of the methods for operational research of the operational reliability of acid-resistant concrete under the influence of climate cycles “freezing – thawing” by the ultrasonic pulse method

Serikov

2023

УМЖ

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An important task of the construction industry is to establish the operational reliability of construction objects under the influence of cyclic climatic loads from freezing and thawing on the concrete. This is especially relevant if such loads are accompanied by moistening followed by the concrete freezing. Such loads cause a violation of the structure of concrete and lead to a decrease in its strength. It is especially important to solve this problem for acid-resistant concrete, which is used in the construction of platforms for unloading or using material and liquids characterized by their aggressive action – acids, alkalis, etc. According to regulatory documents and official methods, the class of concrete in terms of its frost resistance is determined at the stage of its design using destructive methods. For this purpose, a series of concrete samples are prepared, the strength of which is determined by compressive load during a series of “moistening – freezing – thawing” cycles. Samples are frozen in a special freezer. The peculiarity of the operation with acid-resistant concrete is that its saturation in real conditions occurs not only with water, but also with a solution of an aggressive environment. This can intensify the decrease in the concrete strength, and therefore the decrease in its operational reliability. Published research results aimed at improving the determination of frost resistance of the concrete involve the use of, for example, strain gauges embedded in concrete, the acoustic emission method, etc. The main disadvantage of such methods is the significant complexity of implementation, or the impossibility to test the concrete in production conditions. The results of the experiments presented in the paper indicate a real possibility of determining the strength of acid-resistant concrete during operation using the improved ultrasonic pulse method.

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Section: аналіз останніх досліджень і публікаційunclassified

Justification of the methods for operational research of the operational reliability of acid-resistant concrete under the influence of climate cycles “freezing – thawing” by the ultrasonic pulse method

Serikov

2023

УМЖ

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“…On average, it takes no more than 1-1,5 month to determine the frost resistance of an AACusing the proposed methodology for frost resistsnce grade F100.Determination of the rate of ice spreading front and moisture diffusion in building materials by conductometric method during one-sided freezing allows a more detailed study of the mechanisms of frost failure of building materials. Previously, the authors conducted a similar experiment on samples of expanded clay aggregate concrete and masonry mortar[11].…”

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Development of a standard for accelerated determination of frost resistance of autoclaved aerated concrete

Lapovska,

Klapchenko,

Demchenko

2023

ce papers

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IntroductionThe “Introduction” analyses the mechanisms of concrete frost damage and describes standard methods for determining the frost resistance of lightweight and cellular concrete.Research methodsThe frost resistance at different freezing temperatures was carried out on samples of autoclaved cellular concrete of D400 to D600 density. Specimens with dimensions of 100 × 100 × 100 mm were cut from prefabricated parts in accordance with EN 771‐4. During the experiment, frost resistance of ААС samples was determined at a standard temperature of −18 ± 2°C, as well as at temperatures from −5°C to −40°C4.Results and discussionIn the paper, frost resistance of concrete at various freezing temperatures was evaluated by the experimental‐analytical method, which is based on the assumption that frost resistance, expressed in the number of cycles (F) should be inversely proportional to the volume of frozen water at this temperature.The frost resistance of concrete was evaluated experimentally and analytically at different freezing temperatures, assuming that the frost resistance (F), expressed in the number of cycles, should be inversely proportional to the volume of frozen water at that temperature V(t).Determination of the rate of ice spreading front and moisture diffusion in building materials by conductometric method during one‐sided freezing allows a more detailed study of the mechanisms of frost failure of building materials.ConclusionsThe proposed experimental‐analytical method for evaluating AAC frost resistance at different freezing temperatures allows, with a small expenditure of time, to obtain more complete information on the material behavior in freezing temperatures than it is provided by the existing standard methods. The analysis of the dependence of freezing resistance on temperature also allows revealing the regions of temperature where it changes most strongly, and to shift, if necessary, these regions towards lower or higher temperatures by adjusting the composition and technology of AAC production.The developed combined method of independent measurements of moisture diffusion kinetics and ice content makes it possible to determine the speed of diffusion of ice formation front and moisture conductivity depending on the composition (capillary‐porous structure) of samples and their initial storage conditions. This information can give a more reliable picture of the behaviour of AAC under alternating temperature loading under varying initial moisture conditions.

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Effect of nano-modified permeable silicone emulsion on the durability of concrete curbstone

Liu

Qian

et al. 2022

Construction and Building Materials

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Evaluation of the frost resistance of concrete in real operating conditions

Cited by 3 publications

References 5 publications

Justification of the methods for operational research of the operational reliability of acid-resistant concrete under the influence of climate cycles “freezing – thawing” by the ultrasonic pulse method

Justification of the methods for operational research of the operational reliability of acid-resistant concrete under the influence of climate cycles “freezing – thawing” by the ultrasonic pulse method

Development of a standard for accelerated determination of frost resistance of autoclaved aerated concrete

Effect of nano-modified permeable silicone emulsion on the durability of concrete curbstone

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