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    An Experimental Study on the Usability of Reclaimed Asphalt Pavements or Waste Bricks in the Stone Columns
    (Springer Science and Business Media Deutschland GmbH, 2024) Sarici T.; Ok B.; Akbulut N.; Cenk A.H.
    This study presents experiments to find out if recycled asphalt pavements (RAP) or waste bricks (WB) can be used instead of natural aggregates (NA) in the stone columns that are used to increase bearing capacity and speed up consolidation settlement. The first step in this research was to get RAP, WB, and NA, then figure out a suitable gradation and unit weight for stone columns, and lastly do tests in the lab, such as pycnometer, minimum and maximum dry unit weights, water absorption, California bearing ratio (CBR), aggregate impact value (AIV), and large-scale direct shear tests. In order to perform CBR, AIV, and large-scale direct shear tests, it was necessary to find the unit volume weight in the stone column. Therefore, the model tests were conducted in a steel tank. The tank was filled with cohesive soil, so that soft soil conditions were created. And then, the stone columns with a diameter of 5 cm were built using RAP, WB, and NA in the middle of the soft soil. Thus, the unit weight values of RAP, WB, and NA were determined according to the amount of material used for the stone column. The results show that RAP and WB could be an alternative to NA for the stone column, although their strengths were lower than those of NA according to the shear strength parameters. However, it was thought that these waste aggregates should be used by improving their insufficient properties, such as water absorption and crushing behavior. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Large scale tests for geogrid reinforced unpaved roads
    (Korean Geosynthetics Society, 2018) Demir A.; Sarici T.; Ok B.; Demir B.; Komut M.; Comez S.; Mert A.
    This paper intends to present and discuss the performance of geogrid reinforced and unreinforced granular fill layer in unpaved road systems using large scale cyclic plate load tests. A large scale cyclic plate load test facility was developed to study the permanent deformation (rutting) characteristics. Cyclic loads at a constant frequency were applied on geogrid reinforced and unreinforced laboratory unpaved road sections through a rigid circular plate. An unpaved road structure consisting of granular road material over a soft clay soil subgrade was made. To prepare reinforced sections, geogrid was placed within the granular road material at the desired location. Also, geotextile was placed at the interface between road material and soft clay soil subgrade for separation. The model of unpaved road structure was constructed in a steel tank. A total of 5 large scale laboratory tests were conducted to evaluate the effects of geogrid reinforcement. The test results indicated that considerable improvement in bearing capacity was observed when geogrid was placed within the granular road material at all levels of deformations. Permanent deformation (rutting), plastic surface deformation and vertical stress development under cyclic loading was greatly reduced with the inclusion of geogrid. The optimum placement position of geogrid was found at a depth of one-third of the plate diameter below the surface. Copyright © 11th Inter. Conf. on Geos. 2018, ICG 2018. All rights reserved.