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    Evaluation of the bearing capacity of poor subgrade soils stabilized with waste marble powder according to curing time and freeze-thaw cycles
    (Springer Science and Business Media Deutschland GmbH, 2021) Yorulmaz, Aysegul; Sivrikaya, Osman; Uysal, Firdevs
    In this study, pavement subgrade soils were stabilized with two difference types of waste marble powder, and California bearing ratio (CBR) tests were conducted to evaluate the improvement in their bearing capacity. To this end, highly plastic silt (MH) and highly plastic clay (CH) layers were used as the subgrade soil material. A number of unsoaked CBR tests were conducted on the test samples by adding a varying percentage of calcitic marble powder (CMP) and dolomitic marble powder (DMP) using different freeze-thaw cycles (0, 1, 3, 5, 7, and 11 cycles) and curing times (0, 7, 30, and 60 days) in the laboratory. The waste marble powder ratios were taken as 5, 10, 20, 30, and 50% by the dry weight of each soil specimen. SEM and energy dispersive X-ray (EDAX) analyses were also performed on the specimens to determine the efficiency of the marble powders. According to the comparison based on the CBR values, the inclusion of an appropriate amount and type of waste marble powder positively affected the bearing capacity of the subgrade soil samples regardless of curing time and number of freeze-thaw cycles. Moreover, both curing time and freezing-thawing cycles influenced the CBR values depending on the waste marble powder type and content and subgrade soil type. © 2021, Saudi Society for Geosciences.
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    The Efficiency of Waste Marble Powder in the Stabilization of Fine-Grained Soils in Terms of Volume Changes
    (Springer Heidelberg, 2020) Sivrikaya, Osman; Uysal, Firdevs; Yorulmaz, Aysegul; Aydin, Kemal
    The recycling of waste marble powder (MP) for soil stabilization is still under research for geotechnical engineers, with the aim of improving poor soil properties. This paper investigated the effect of calcitic marble powder (CMP) and dolomitic marble powder (DMP) on the geotechnical properties of fine-grained soils. Consistency limits, linear shrinkage, expansion index, and one-dimensional consolidation tests were performed on non-stabilized and stabilized samples with 5, 10, 20, 30, and 50% of waste CMP and DMP to determine the efficiency of using waste marble powders in soil stabilization. The marble powder ratio which gave the best results was determined as 50% for both MH samples and CH samples. The laboratory test results showed that the waste marble powders were effective in soil stabilization by reducing the plasticity index from 49 to 26 for the CH samples and from 21 to 9 for the MH sample, expansion index from 45 to 20 for the CH sample and from 32 to 7 for the MH sample, swelling index from 0.0030 to 0.0012 for the MH sample, compression index from 0.013 to 0.010 for the MH sample, and linear shrinkage from 16.2 to 10.5 for the CH sample. The waste MP content and fine-grained soil type need to be taken into consideration in soil stabilization based on volume change.