Investigation of the Effect of Strain Rate and Moisture on the Direct Tensile Strength of Clay Soils Stabilized with Bentonite, Lime, and Cement

Document Type : Research Paper

Authors

1 Civil Engineering Dept.- Faculty of Civil Engineering and Architecture- Shahid Chamran University of Ahvaz, Ahvaz, I.R.Iran

2 Civil Engineering Dept., Shahid Chamran University of Ahvaz, Ahvaz, I.R.Iran

3 Civil Engineering Dept., Civil Engineering and Architecture, Shahid Chamran University of Ahvaz, Ahvaz, I.R. Iran

Abstract

Knowledge of the Behavior of the compacted soils in tension is of importance for understanding of cracking that occurs in earth structures, in particular embankment dams and landfill barriers. The tensile behavior of geomaterials plays a significant role in various engineering applications. Compacted soil layers such as in dams and clayey liners can suffer from cracking due to tensile failure. Geomaterials such as stabilized soils used in road pavement construction can undergo cracking induced by tensile stresses. Tensile stresses and strains can be induced by desiccation and shrinkage due to moisture loss, bending of soil layers due to differential settlements or external loads, and by gravitational forces as at the crest of slopes. In order to understand the development of tensile crack, it is necessary to know the exact value of tensile strength that the particular soil consist of.

Understanding the correlation between tensile properties and traditional soil parameters and soil suction is essential in identifying problems associated with desiccation induced cracking.

A series of extensive laboratory experiments was performed on clayey and Stabilized soils. This paper concentrated on the investigation of tensile strength in relation to the type of soil, compaction water content, compaction density, rate of Strain, and the effect of Stabilizing with Lime and Cement.

Tensile properties indicated a dependence on soil type and compaction criteria. The clay content and type of mineral has shown a significant influence on tensile strength.

This paper describes a newly developed apparatus for measuring the tensile strength

of compacted and stiff soils as well as saturated soft to medium clayey soils.Repeatability of

test results is also verified. Effects of strain rate, water content, dry density, and bentonite particles are examined. Also tensile Strength of stabilized soil are tested.

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Articles in Press, Accepted Manuscript
Available Online from 08 December 2024
  • Receive Date: 24 July 2024
  • Revise Date: 24 October 2024
  • Accept Date: 08 December 2024
  • Publish Date: 08 December 2024