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Use of Sewage Sludge Ash and Hydrated Lime to Improve the Engineering Properties of Clayey Soils

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Abstract

Using various additives has been considered as one of the most common stabilization methods for improvement of engineering properties of fine-grained soils. In this research the effect of sewage sludge ash (SSA) and hydrated lime (HL) on compressive strength of clayey soil was investigated. For this purpose, 16 kinds of mixtures or treatments were made by adding different amounts of SSA; 0, 5, 10 and 15% by weight and HL; 0, 1, 3 and 5% by weight of a clayey soil. First, compaction characteristics of the treatments were determined using Harvard compaction test apparatus. So that, 12 unconfined compressive strength test specimens were made using Harvard compaction mold from each treatments taking into account four different curing ages, including 7, 14, 28 and 90 days in three replications. Therefore, a total of 192 specimens were prepared and subjected to unconfined compressive strength tests. The results of this study showed that the maximum dry density of the treated soil samples decreases and their optimum water content increases by increasing the amount of SSA and hydrated lime in the mixtures. It is also found that the adding of HL and SSA individually would increase the compressive strength up to 3.8 and 1.5 times respectively. The application of HL and SSA with together could increases the compressive strength of a clayey soil more efficiently even up to 5 times.

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Acknowledgements

This research has been carried out in the laboratories of soil mechanics and construction materials in Tak Azmaye Zanjan Consulting Company, Iranian agricultural engineering research Institute and Sanaye Mese Novin Company. The authors hereby express their thanks to the staff and management of the mentioned companies and institute.

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Authors and Affiliations

  1. Department of Water Engineering, Isfahan University of Technology, Isfahan, Iran

    Kamyar Norouzian & Jahangir Abedi Koupai

  2. Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran

    Nader Abbasi

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  1. Kamyar Norouzian
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  2. Nader Abbasi
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  3. Jahangir Abedi Koupai
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Correspondence to Nader Abbasi.

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Norouzian, K., Abbasi, N. & Abedi Koupai, J. Use of Sewage Sludge Ash and Hydrated Lime to Improve the Engineering Properties of Clayey Soils. Geotech Geol Eng 36, 1575–1586 (2018). https://doi.org/10.1007/s10706-017-0411-9

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  • DOI: https://doi.org/10.1007/s10706-017-0411-9

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