Abstract
Considering the dredging activity in ports and channels, large amounts of sediment are generated as waste materials to be disposed of. The administration of such sediments is a major environmental problem for many countries worldwide. Environmental impacts caused by dredging, such as turbidity and disruption of the marine ecosystem, have increased the demand for the reuse of dredged soil in civil engineering applications. Typically, dredged soils have a low bearing capacity and low shear strength, hence the dredged soils should be strengthened up by solidification. Also, the dredged soils have organic matter, so they have high compressibility. This study aims to improve the compressibility behavior of dredged soil obtained from Izmir Bay in Turkey. Also, the effects of organic matter content (OM) on the geotechnical and compressibility properties of dredged soil were investigated. Different percentages of lime (L), thermal power plant fly ash (T), and silica fume (S), namely 5, 10, 15, and 20% were used using a dry mixing method to improve the compressibility behavior of dredged soil and then 1D consolidation tests were conducted with these samples. Also sieve analysis, consistency limit, specific gravity, pH determination, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and 1D consolidation tests have been performed for dredged samples which have various OM (0, 4, 7, 11%). The test results have shown that change in the void ratio (Δe), compression index, and liquid and plastic limit of natural samples increased with the OM increasing. For L additive samples, compression index (Cc) and axial strain (ε) values decreased with the OM increasing but swelling index (Cs) values decreased with the OM increasing for only 11% OM (11OM) samples. The T additive had a positive effect on the Cc and ε values for all samples and Cs values for 7OM and 11OM samples. The S showed a positive effect of up to 10% for 11OM samples only. It was found to have a negative effect on all samples from 15% addition.
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Develioglu, I., Pulat, H.F. (2023). Laboratory Study on Stabilization of Dredged Soil by Sustainable Materials. In: Yukselen-Aksoy, Y., Reddy, K.R., Agnihotri, A.K. (eds) Sustainable Earth and Beyond. EGRWSE 2022. Lecture Notes in Civil Engineering, vol 370. Springer, Singapore. https://doi.org/10.1007/978-981-99-4041-7_24
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