Strength and Consolidation Characteristics for Cement Stabilized Cohesive Soil Considering Consistency Index
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ORIGINAL PAPER
Strength and Consolidation Characteristics for Cement Stabilized Cohesive Soil Considering Consistency Index Ahmed F. Zidan
Received: 3 May 2019 / Accepted: 16 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract The undrained shear strength and consolidation characteristics for both remolded and stabilized soil are required in many geotechnical applications. In this paper a comprehensive laboratory work was carried out on cement-stabilized cohesive soil. The undrained shear strength of both untreated and treated soil at different consistency indices particularly at liquid and plastic limits has been determined based on direct and reverse extrusion tests. Furthermore, a series of oedometer test was performed in order to estimate the consolidation characteristics in terms of compression index, swelling index and yield stress of cement-stabilized soil in comparison to untreated soil. Three different soils available in Upper Egypt were extensively used under the influence of four different cement contents. Besides, the effect of curing period on soil strength and the variation of soil water content during treatment were also presented. The laboratory results were used to establish nonlinear regression formula for untreated soil combining the consistency index and undrained shear strength. The results indicated, through the variation of parameters, that the soil strength due to cement stabilization ranges between 152 and 625 times that for untreated soil at liquid limit. In addition, compression index for treatment soil decreased by about 92% to 37%. A. F. Zidan (&) Department of Civil Engineering, Faculty of Engineering, Beni-Suef University, Beni-Suef 62514, Egypt e-mail: [email protected]
Keywords Undrained shear strength Remolded soil Soil–cement stabilization Extrusion test Consolidation characteristics
1 Introduction The undrained shear strength of remolded and stabilized cohesive soil is one of the key parameters in many geotechnical problems. Through several decades ago, due to low strength and high compressibility characteristics for soft clay deposits, various techniques such as admixtures and soil densification were used to enhance their strength as well as decreases compressibility. The admixture could be binder chemical, fly ash and industrial wastes (see for example; Zidan et al. 2019; Aboukhadra et al. 2018; Baghdadi et al. 1995; Gyanen et al. 2013; Khan and Sarker 1993; Khandaker and Anwar 2011). Among several modes of stabilizations, cement additives either cement slurry or powder form into soft soil is a common method of ground soft improvement technique. The inclusion of cement into the soil water system leads to improving the mechanical performance of the treated soil. This attributed to, due to cement stabilization, physcio-chemical changing at microstructural level. The in situ columnar inclusion using rotating mixing tools is an established mean to increase soil bearing capacity and reducing potential
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