Modulus of resilience under road and runway stresses for base soil modified with cement and lime

Document Type : Research Article

Authors

1 Geotechnical Engineering Department, Road, Housing & Urban Development Research Center, Tehran, Iran

2 Professor of the Department of Soils and Foundations, Faculty of Civil Engineering, Khwaja Nasiruddin Toosi University of Technology

3 Student of Soil and Foundation Department, Faculty of Civil Engineering, Khajeh Nasir al-Din Tusi University

4 Faculty member of Geotechnics and Pavement Department of Geotechnics and Infrastructure Research Center

Abstract

This paper examines the behavior of untreated and treated soil with cement and lime, as well as the relationship between the design parameters of the base layer such as uniaxial compressive strength (UCS), CBR with resilient modulus. The specimen selection for the triaxial test was based on the results of UCS, indirect tensile strength (INTS), wetting-drying, and freezing-thawing cycles tests. In general, the addition of lime along with cement causes the tensile strength to be halved compared to the addition of cement alone, but it eliminates the volume reduction problems caused by modification with cement. Also, a large-scale dynamic triaxial test was performed on the untreated base and C7L2 specimens. In all confining pressures, the values of elasticity modulus and damping ratio of C7L2 are higher and lower, respectively, compared to the untreated soil. The data points of the ratio of modulus of the elasticity-axial strain of specimen C7L2 are above the corresponding curves for sand and even higher than the rock ones, and its damping ratio data points are above the corresponding curve for rock specimens. The average values of the modulus of elasticity increase with the increase of confining pressure and initial axial stress. Increasing the loading frequency increases the Yang modulus, shear modulus, and damping ratio, but decreases the induced shear strain on the specimen.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 10
January 2024
Pages 2065-2090

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