Қазақ ұлттық қыздар педагогикалық университеті / Казахский национальный женский педагогический университет

Постоянный URI для этого сообществаhttps://cris.qyzpu.kz/handle/123456789/1

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Автор: search.filters.author.Bagdat Burkhanbaiuly TeltayevТема: search.filters.subject.minimum temperature

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    Тип записи:Публикация,
    Characteristics of Cyclic Freeze-Thaw of a Highway Pavement and Subgrade
    (2026-01-01)
    Bagdat Burkhanbaiuly Teltayev
    ;
    Giuseppe Loprencipe
    ;
    Yerbol Aitbayev
    ;
    Azamat Zhaisanbayev
    ;
    G. I. Salgarayeva
    Temperature has a strong influence on the mechanical behavior of road pavement layer materials and subgrade soil which requires reliable information on temperature changes in them.At different characteristic periods of a year temperature can be one of main factors in a destruction of structural elements of highways.This paper analyzes the results of monitoring of temperature and moisture in layers of a pavement structure and its subgrade on the section (58 km + 895 m) of the "Almaty-Bishkek" highway.The monitoring was carried out using a special measuring system.In particular, based on the measured temperature values, characteristics of cyclic freeze-thaw (number, durations and minimum temperatures) in the first asphalt concrete layer of the pavement are established: the number of FTCs is 83; most FTCs have a duration of no more than 20 hours (80.72%) and a minimum temperature of no lower than -6°C (more than 80%); there are correlations between duration and minimum temperature for short (less than 25 hours) and (more than 25 hours) long durations.Correct accounting of the characteristics of FTCs will increase the strength and durability of road pavements.
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    Characteristics of cyclic freeze-thaw of a city road
    (Elsevier BV, 2026-04-14)
    Bagdat Burkhanbaiuly Teltayev
    ;
    Yerbol Aitbayev
    ;
    Azamat Zhaisanbayev
    ;
    Aizhan Muta
    The purpose of this paper is to experimentally establish quantitative indicators, relationships and dependencies on the depth of characteristics (amount, duration and minimum temperature) of freeze-thaw cycles of a road in the climatic conditions the Almaty city located in the south-eastern region of Kazakhstan. Monitoring of temperature in the road was carried out using a special measuring system. It was found that the largest amount of FTCs, equal to 76, occurs on the pavement surface and decreases with depth (up to 6 at a depth of 28 cm); the absolute value of the lowest minimum temperature of FTCs also decreases with depth: -17.9 °C on the pavement surface and –0.3 °C at a depth of 69 cm. The depth of 21.5 cm is designated as the boundary, above which the FTCs characteristics are determined by daily temperature fluctuations and below which they are determined by seasonal and annual temperature fluctuations; at the boundary depth the maximum, minimum and average durations of FTCs have the greatest values (1039.5, 3.3 and 521.4, respectively). In the region under consideration and in others with similar climatic conditions, when assessing the strength and durability of asphalt concretes taking into account cyclic freezing and thawing, it is recommended to assign the amount and minimum temperature of FTCs according to the results obtained in the paper; the duration of FTCs is taken to be equal to 20 h; it is recommended to conduct laboratory tests on asphalt concrete samples when they are fully saturated with water.