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    Experimental Investigation of the Stabilization Performance of Geogrids for Unpaved Roads with Low Bearing Capacity Subgrade
    (Springer Science and Business Media Deutschland GmbH, 2022) Gökova, Süleyman; Saltan, Mehmet; Terzi, Serdal; Tutumluer, Erol; Uz, Volkan Emre; Karaşahin, Mustafa
    In this study, laboratory experiments were carried out on real sized samples to investigate the reinforcement performance of geogrids in highway pavements constructed on low bearing capacity subgrade (California Bearing Ratio, CBR = 3%). In all prepared samples, Hot Mix Asphalt (HMA ) layer was not applied. A moving wheel load was applied with Accelerated Pavement Tester (APT) device on representative pavement samples with and without geogrids. Two types of geogrids were used to construct the pavement sample configurations. Resistance to plastic (permanent) deformation was recorded as a performance indicator to compare structural performance trends of the pavement samples. For this objective, surface deformations were measured after certain wheel load repetitions. Rut depths have been calculated from surface profiles measured with a laser profiler and were plotted versus number of load repetitions. As a result of this study, the use of geogrid over soft subgrade with low CBR values has been shown to extend the life of the pavement by reducing the rut depth. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Öğe
    Experimental investigation of the stabilization performance trends of two geogrids constructed on low bearing capacity subgrade
    (Korean Geosynthetics Society, 2018) Gökova, Süleyman; Saltan, Mehmet; Terzi, Serdal; Tutumluer, Erol; Uz, Volkan Emre; Karaşahin, Mustafa
    Experiments were carried out on real size samples in the laboratory to investigate the geogrid stabilization performance in highway pavement applications. A moving wheel load was applied on representative pavement samples constructed on low bearing capacity subgrade with and without geogrids. Two types of geogrids were used to construct the pavement sample configurations. Resistance to plastic (permanent) deformation was recorded as a performance indicator to compare structural performance trends of the pavement samples. For this objective, surface deformations were measured after certain wheel load repetitions. Rut depths were calculated from surface profiles measured with a laser profiler. Layer thicknesses were varied to observe differences in the deformation trends. When appropriate conditions were reached in the trial configurations, all layer thicknesses were kept constant during the tests. The two geogrid types constructed with the same granular materials and varying layer thicknesses were used in different layer interfaces to search for the most optimum solution. According to the study findings, the use of geogrid over soft subgrade with low CBR values has been shown to extend the life of the pavement by reducing the rut depth. Copyright © 11th Inter. Conf. on Geos. 2018, ICG 2018. All rights reserved.
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    Investigation of the effect of using geogrids on the performance of the road in pavements constructed with reduced layer thicknesses
    (Crc Press-Taylor & Francis Group, 2024) Terzi, Serdal; Saltan, Manzoor; Gokova, Süleyman; Erkmen, F.; Tutumluer, Erol; Karaşahin, Merve; Uz, Volkan Emre; Pekcan, Önder; Taciroǧlu, Murat Vergi; Çömez, Saadet; Sağlık, Ahmet; Komut, Muhammet; Altıok, Serhat; Yalçın, Evrim
    In this study, the structural performance of road pavements with reduced layer thicknesses at different rates using geogrids was examined, and the benefits of geogrids in preventing rutting were investigated. Within the scope of the study, a total of 16 test sections of 50 meters in length, 12 with geogrids and four without geogrids, were constructed on the Adana - Kozan road determined by the General Directorate of Highways of Turkey (KGM). The constructed sections were divided into two, and besides the reference sections, two types of geogrids with different geometric structures were used in successive sections. Some layer thicknesses used in the study were determined following the specification, and the other part was determined through a pavement design program. In addition, to compare the effect of using geogrids in different locations on the pavement performance in the application sections, the geogrid was used in two positions, on the subbase layer and between the base layer. Data from the load, displacement and temperature sensors placed between the layers during the construction phase and on-site Heavy Weight Deflectometer (HWD) data at certain time intervals were used to observe the structural performances of the constructed pavement sections. In addition, GPS and IRI measurements are made regularly. The traffic values of the trial section are also monitored. Examining the obtained data aims to compare the economic gain achieved by reducing the layer thicknesses, the cost to be spent for the geogrid, and to make cost-benefit analyses.