Field Experimental Investigations of Freezing and Thawing of Highway Subgrade

Teltayev, Bagdat; Zhussupbekov, Askar; Shakhmov, Zhanbolat; Suppes, Elena A.

doi:10.1007/978-981-15-0450-1_5

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Highway engineers have recently encountered widespread issues, such as rutting, raveling, stripping, and cracking, which cause flexible pavements to break early. The strength and operational life of the highway are mostly dependent on the subgrade layer [2,3]. A typical flexible pavement is made up of layers made of various materials, such as a surface layer, a base course layer, a subbase course layer, and a subgrade layer, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil

Tessema,

Wolelaw,

Abebe

et al. 2023

Advances in Civil Engineering

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Expansive clayey soils (CSs) expand and become softer as moisture content increases, but they get harder and stronger as they dry out. The earth’s swelling and shrinkage characteristics under varying moisture conditions make roads built on expansive CS, in particular, vulnerable to early degradation. In this investigation, coffee husk ash (CHA), gypsum, and a blend of the two additives (G-CHA) were used in experimental tests to treat expansive CS. This study aims to evaluate experimentally the potential of expansive soil stabilization using different additives: CHA, gypsum, and a combination of gypsum and CHA. Five different percentages of CHA (5%, 10%, 15%, 20%, and 25%), three percentages of gypsum (3%, 6%, and 9%), and variable percentages of their combinations were used to stabilize the soil for pavement subgrade application. Atterberg limits, compaction, linear shrinkage (LS), swelling, unconfined compressive strength (UCS), and California bearing ratio (CBR) tests were performed on treated and virgin soil specimens at 3, 7, 14, 28, and 56-day curing times. Results showed that CHA additives effectively reduced the plasticity, LS, and swell potential in addition to increasing the maximum dry unit weight, UCS, and CBR. It was determined that the UCS and CBR values for the 6% stabilized gypsum soil increased by 28.95% and 19.54%, respectively, and reduced by 41% of the plastic index parameter after the addition of 15% CHA. Based on the evaluation of the results, an optimum mixture of 6% gypsum and 15% CHA (SG6C15) stabilized soil can be used in pavement subgrade applications as it achieved the minimum strength target. The performance of CHA-treated samples as subgrade material is superior to that of untreated virgin soil. Because of the stronger subgrade, smaller pavement layers result in a thinner pavement structure.

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Section: Introductionmentioning

confidence: 99%

Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil

Tessema,

Wolelaw,

Abebe

et al. 2023

Advances in Civil Engineering

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“…In other works [24,25], the authors investigated the peculiarities of the temperature and moisture distribution at the points of the pavement and the subgrade and their variations over time during different periods of the year, including the winter season.…”

Section: Introductionmentioning

confidence: 99%

Freezing and Thawing Processes of Highways in Kazakhstan

Teltayev¹,

Rossi

Aitbayev³

et al. 2022

Applied Sciences

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This paper presents the results of an experimental study of freezing and thawing patterns of highways in Kazakhstan. Special sensors measure temperature and moisture change every hour in automatic mode. The purpose of this work is to develop a methodology for determining the depth of freezing of subgrade soils of roads of Kazakhstan, and the task is to establish the pattern of cold temperature change (temperature “0 °C”) through certain points (sensors) at any time. In the upper part of the pavement (up to 30–40 cm), the temperature changes in annual and daily cycles. As the depth increases, the daily temperature fluctuations disappear, leaving only the annual fluctuation. At a depth of 180 cm and below, temperature fluctuations occur only in the annual cycle. The freezing rate varied from 14 cm/day to 0.33 cm/day. The maximum freezing depth was 227 cm. The descending branch of thawing occurs almost uniformly, with an average rate of 6.25 cm/day to a depth of 220 cm; the average rate of the ascending branch of thawing is 0.9 cm/day. Asphalt–concrete layers of the pavement and the upper part of the subgrade were in a frozen state for 151 and 166 days, respectively. In the subgrade at the beginning and end of the cold period, there are abrupt changes in moisture, which are explained by phase transitions of the second order: the transition from the liquid state to the solid (ice) at the beginning of the cold period and the transition of moisture from the solid state to liquid at the end of the cold period.

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“…автомобильной дороги Астана-Боровое на участке 76км+30 [2], в 2013-2016 гг. был проведен мониторинг температурно-влажностного режима трассы Алматы-Бишкек на участке 58км+895 [7], в 2017 г. -Кызылорда-Шымкент 297км+00 [8], Атырау-Астрахань 598км+50 [9], в 2013-2015 гг.…”

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Мониторинг Состояния Автомобильных Дорог В Зимний Период В Городе Нур-Султан

Сарсембаева,

Мусаханова,

Сагинов

et al. 2022

bultechenukz

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В настоящей работе выполнен анализ физических и механических свойств грунтов оснований на участке автомобильной дороги в геоклиматических условиях города Нур-Султан. Пробы грунтов земляного полотна были изъяты в зимний период для определения плотности, природной влажности, а также пластических свойств грунтов в лабораторных условиях. Прочностные и деформационные характеристики были определены путем испытаний на компрессионных и сдвиговых проборах. Одновременно проводился мониторинг температуры в зимний период при помощи установки сенсоров в слоях дорожной одежды и земляного полотна автомобильной дороги. Была определена глубина промерзания в зимнее время, а также проанализировано распределение температуры в глубине дорожной одежды и грунтов основания. Установлено, что слои дорожной одежды остаются в стабильно мерзлом состоянии при краткосрочных повышениях температуры до +6,6 °С за счет субкомпенсации тепла (теплопередачи) подлежащих слоев и имеют достаточный запас прочности. А наибольшим температурным воздействиям подвергаются слои на глубину 25 см от поверхности дорожного покрытия. Для предотвращения негативного воздействия и неравномерной деформации земляного полотна вследствие сезонного промерзания предлагается устройство дополнительной пароизоляции на глубине 57 см, ниже -подстилающего слоя гравийно-песчаной смеси.

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Field Experimental Investigations of Freezing and Thawing of Highway Subgrade

Cited by 5 publications

References 9 publications

Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil

Utilization of Coffee Husk Ash on the Geotechnical Properties of Gypsum-Stabilized Expansive Clayey Soil

Freezing and Thawing Processes of Highways in Kazakhstan

Мониторинг Состояния Автомобильных Дорог В Зимний Период В Городе Нур-Султан

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