Abstract
Cohesive soils present difficulties in construction projects because it usually contains expansive clay minerals. However, the engineering properties of cohesive soils can be stabilized by using various techniques. The research aims to elaborate on the influences of using hydrated lime on the consistency, compaction, and shear strength properties of clayey soil samples from Sulaimnai city, northern Iraq. The proportions of added hydrated lime are 0%, 2.5%, 5%, 7.5% and 10% to the natural soil sample. The results yielded considerable effects of hydrated lime on the engineering properties of the treated soil sample and enhancement its strength. The soil's liquid limit, plasticity index, and optimum moisture content were decreased with the increase of hydrated lime percent. The soil's other geotechnical properties such as plastic limit, maximum dry density, and unconfined compressive strength were increased with the hydrated lime content increase. The oedometer test results produced a notable decrease in the compressibility characteristics of the lime-treated soil sample. Hence, hydrated lime is successfully contributed and can be considered as an effective material to improve the strength, compressibility, and consistency properties of the cohesive soils in Sulaimani city.
Highlights
In order to obtain an eligible soil foundation for construction projects, its geotechnical characteristics might require some improvement
This study presents the effect of hydrated lime on the Atterberg limits, compaction characteristics, compressibility parameters, and unconfined compressive strength of Sulaimnai city, Northern Iraq
Each part was mixed with 0%, 2.5%, 5%, 7.5%, and 10% of hydrated lime, which was replaced from the total dry mass of the natural soil sample, and the required water content was added
Summary
In order to obtain an eligible soil foundation for construction projects, its geotechnical characteristics might require some improvement. Lime is effectively utilized for soil improvement purposes to stabilize soil's weak geotechnical engineering characteristics. For soils shear strength characteristics, in some recent studies (Consoli et al, 2012; Calik et al, 2014; Asad et al, 2019; Kumar et al, 2019; Chandak and Babu, 2015; Al-Alwan, 2019), the addition of lime found to improve the soils significantly strength properties. The obtained sample was light brown clayey soil and is composed of some clay It can be defined as low plasticity soil (CL) according to the Unified Soil Classification System (D-422, 2007).
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