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    Wyświetlanie 1-6 z 6
    Tytuł:
    An assessment of how penetration curve adjustment affects the California bearing ratio (CBR)
    Autorzy:
    Bednarek, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2041293.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    CBR
    pavement structure
    subbase
    road base
    Opis:
    With the rapidly developing road transport, there is a demand for new roads to be constructed and for the existing ones to be repaired or extended. The base of any road is its foundation, usually made of crushed or uncrushed aggregate. To be used for road foundation purposes, a material needs to meet many requirements, as imposed by relevant standards. One of the basic tests to assess the suitability of an aggregate is to determine its California bearing ratio (CBR). This paper presents the results of CBR tests for mixed aggregate with the grading of 0–31.5 and 0–63 mm. Detailed assessments were carried out for penetration curves, which in many cases need to be adjusted to meet industry standards. The adjustment of plunger penetration curves in aggregate samples causes CBR to increase compared to the original curves.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, 4; 323-336
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of cyclic CBR test to approximation of subgrade displacement in road pavement
    Zastosowanie cyklicznych badań CBR do wyznaczania przemieszczeń podłoża drogowego
    Autorzy:
    Sas, W.
    Gluchowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/40953.pdf
    Data publikacji:
    2013
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    road pavement
    road base
    cohesive ground
    cyclic loading
    California Bearing Ratio
    Opis:
    The main aim of this paper was to approximate displacement of subgrade surface under cyclic loading. Soil specimens were loaded by force, which caused displacement to 2.54 mm. After that, specimens were loaded by the same force a number times. This procedure allowed to define the kind of displacement occurring under cyclic loading. An analysis of individual displacement was done on paper. Soil specimen was sandy clay and sandy clay stabilized by the addition of lime, the amount of which equals 8%. The additional aim was to prove that stabilization of cohesive soils with lime can marked increase stiffness of soil and to show various load-unload conditions of stabilized and non-stabilized sandy clay.
    Celem artykułu było określenie przemieszczeń osiowych powstałych w wyniku działania siły cyklicznej przyłożonej na powierzchni podłoża gruntowego. Próbki zostały obciążone siłą, która spowodowała przemieszczenie powierzchni o 2,54 mm. Po tym badaniu próbki były obciążane wielokrotnie tą samą siłą. Ta procedura badawcza pozwoliła na zdefiniowanie rodzaju przemieszczeń w wyniku obciążenia cyklicznego. W artykule dokonano analizy poszczególnych przemieszczeń. Materiałem była glina piaszczysta z 8-procentowym dodatkiem wapna hydratyzowanego. Dodatkowym celem badań było udowodnienie wyraźnego zwiększenia sztywności gruntów kohezyjnych za pomocą stabilizacji oraz ukazanie różnorodnych ścieżek obciażenie – odciążenie dla stabilizowanej i niestabilizowanej gliny piaszczystej.
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2013, 12, 1
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of gabbro dust in the cold recycling of asphalt paving mixes with foamed bitumen
    Autorzy:
    Iwański, M.
    Buczyński, P.
    Mazurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/200980.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gabbro dust
    cold recycling technology
    foamed bitumen
    road base course
    pył
    gabro
    technologia recyklingu na zimno
    bitumen
    Opis:
    Mineral fines are a waste product of aggregate production in quarries and asphalt mixing plants. The incorporation of mineral gabbro dust into foam bitumen causes developing of a mesh reinforcement in the recycled base mixture. This mesh reinforcement, observed in a recycled base structure, induces an increase in stiffness modulus, where its elastic part of complex modulus dominates over the imaginary part. Therefore, it is possible to create a recycled mixture with a lower susceptibility to loading time/temperature. In result, the presence of gabbro dust in recycled mixture limits the magnitude of strains induced by the traffic load. This paper presents the results of the tests carried out on the mineral dusts derived from gabbro rock. Structural and functional properties of the fines were determined to prepare their characteristics. Then, the cold recycled mixtures for the road base were designed with the 5–20% mineral fines content. The mixtures were prepared in cold recycling technology with foamed bitumen. Further tests involved determining mechanical and physical properties of the recycled mixes, including air voids content, Marshall stability, Marshall quotient (stiffness), indirect tensile strength and stiffness modulus at 20°C). The results indicated a positive influence of the gabbro dusts on the investigated parameters. With the use of ANOVA tests, the significance of the influence of the gabbro dust and foamed bitumen on these properties was evaluated. Harrington’s multicriteria method was employed to establish gabbro dust and foamed bitumen amounts, the addition of which would guarantee optimal properties of the recycled base mixture.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 763-773
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the pavement performance
    Autorzy:
    Iwański, M.
    Chomicz-Kowalska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202404.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Marshall hammer
    hydraulic press
    road base
    full-depth cold recycling technology
    foamed bitumen
    bitumen emulsion
    durability
    resistance to moisture damage
    diagnosis
    ubijak Marshalla
    prasy hydrauliczne
    technologia recyklingu pełnej głębokości na zimno
    asfalt spieniony
    bitumiczna emulsja
    trwałość
    odporność na uszkodzenia wilgoci
    diagnoza
    Opis:
    This paper focuses on evaluation of two laboratory-based methods of compaction of foamed bitumen and bitumen emulsion mixes: impact compaction with a Marshall hammer and static compaction using a hydraulic press. The investigated compaction methods were assessed in terms of their impact on the physical and mechanical properties of produced laboratory specimens, including: air void content, indirect tensile strength before and after conditioning in water (ITSdry, ITSwet), tensile strength ratio (TSR), and indirect tensile stiffness modulus (ITSM) at 0°C, 10°C and 20°C. The statically compacted specimens attained higher levels of mechanical properties and resistance to moisture damage, which was associated with a lower content of air voids in the specimens formed using a hydraulic press. Authors present a calculation showing that a mechanistic design based on the laboratory static press compaction method leads to overestimation of fatigue cracking resistance of the road base.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 97-105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Strategic Base in the Global Supply Chain: Türkiye
    Autorzy:
    Aydın, Kenan
    Powiązania:
    https://bibliotekanauki.pl/articles/2131120.pdf
    Data publikacji:
    2020-10-10
    Wydawca:
    Uniwersytet Warszawski. Centrum Europejskie
    Tematy:
    Silk Road
    One Belt One Road Project
    Logistics
    Logistics Base
    Türkiye
    Turkey
    Logistics Centres
    Opis:
    Türkiye is becoming a new base in the global supply chain due to its geopolitical position and the cost advantages it provides. Due to the COVID-19 outbreak, logistics problems, especially production and transportation costs, have further strengthened Türkiye's position in this context. Türkiye's strategic location, strong logistics infrastructure, costeffective and qualified workforce, along with a liberal investment climate, offer a suitable environment for international companies. Türkiye ranks well in the World Bank's Logistics Performance Index, which evaluates countries' logistics performance in customs, transportation, and infrastructure. Türkiye has served as a bridge between the east and west since historical times. During the Seljuk period, caravanserais and other infrastructure and service areas were established in Anatolia to support commercial activities. The Silk Road, which had an important place until a certain period of the Ottoman Empire, lost its importance due to other developments. The “One Belt One Road Project” initiated by China, still in progress and planned to be completed in 2049, will make Türkiye even more important in terms of the global supply chain in the next 10 years. İpekyolu follows the northern and southern routes in Anatolia. With China's “One Belt One Road Project”, the Silk Road will regain its former importance as the “Modern Silk Road”. Chinese President Xi Jinping first mentioned the Land and Sea Silk Road project in one of his speeches in 2013. It has been decided to name these two projects as the “Belt and Road Initiative-BRI” or the “One Belt One Road-OBOR” project. The word belt constitutes the land route of the project, which includes highways, railways, oil and natural gas pipelines, and infrastructure investments. The word road includes the sea routes covered by the project. The routes of these corridors are provided by multi-dimensional corridors in the direction of Asia-Europe instead of a single route. Within the scope of this project, many infrastructure investments are made in Türkiye as well. In this study, the cost advantages that Türkiye will provide to the global supply chain will be evaluated due to both its cost and geographical location and the infrastructure investments made.
    Źródło:
    Studia Europejskie - Studies in European Affairs; 2022, 26, 3; 117-141
    1428-149X
    2719-3780
    Pojawia się w:
    Studia Europejskie - Studies in European Affairs
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The methods for diagnostic of the technical condition of vehicles employing high precise satellite data
    Методика использования высокоточных спутниковых измерений для диагностики технического состояния транспортных средств
    Autorzy:
    Kulik, A.
    Dergachov, K.
    Lytvynenko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/374069.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    base station
    rover
    antenna
    transport unit
    controllability
    road holding
    stacja bazowa
    antena
    jednostka transportowa
    sterowalność
    Opis:
    The paper presents a methodology for diagnostic of the technical condition of vehicle. The high accuracy of the actual trajectory of the transport aggregate (TA) is provided by the use of local differential mode of global navigation satellite system (GNSS). Comparing the real and rational trajectories will determine the kinematic and dynamic characteristics of the car.
    Предложена методика определения технического состояния транспортного средства. Высокая точность определения реальной траектории движения транспортного агрегата (ТА) обеспечивается использованием локального дифференциального режима работы GNSS. Сравнение реальной и рациональной траекторий движения позволит определить кинематические и динамические качества автомобиля.
    Źródło:
    Transport Problems; 2014, 9, 1; 119-128
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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