Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The use of byproducts of industrial materials is one the most interesting areas in geotechnical engineering in recent years. Microsilica is one of these harmful byproducts that obtained from silicon or silicon alloy metal factories. On the other hand, silty soils are not considered as suitable soils due to their low strength characteristics. In this research, the effects of lime and microsilica on stabilization of silty bed soil of a region of Karaj railway are investigated and its efficiency as a subgrade material is evaluated. To determine the best combination of the stabilizer, various contents of lime and microsilica are mixed with the soil at the optimum moisture content. Then CBR tests have been conducted on the stabilized samples after 28 days of curing time in saturated condition. For next stage, the content which is the optimum CBR value (from an economic and resistant viewpoint) has been chosen. The sample stabilized with 5% lime and 12% microsilica was indicated the maximum CBR values. Additionally, in order to observe the influence of freeze- thaw cycles on CBR values of stabilized soil, several specimens, rebuilt in similar condition. After that, the samples are exposed to freezing- thawing cycles and results are compared. Results show a reduction in CBR values by freezing- thawing cycles; but almost 90 percent of this reduction was occurred in the first cycle and there were no significant decrease happened on the CBR values of the next cycles.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

The Influence of Freeze-Thaw Cycles on CBR Values of Silty Soils Stabilized With Lime and Microsilica

Chicago, Illinois

The use of byproducts of industrial materials is one the most interesting areas in geotechnical engineering in recent years. Microsilica is one of these harmful byproducts that obtained from silicon or silicon alloy metal factories. On the other hand, silty soils are not considered as suitable soils due to their low strength characteristics. In this research, the effects of lime and microsilica on stabilization of silty bed soil of a region of Karaj railway are investigated and its efficiency as a subgrade material is evaluated. To determine the best combination of the stabilizer, various contents of lime and microsilica are mixed with the soil at the optimum moisture content. Then CBR tests have been conducted on the stabilized samples after 28 days of curing time in saturated condition. For next stage, the content which is the optimum CBR value (from an economic and resistant viewpoint) has been chosen. The sample stabilized with 5% lime and 12% microsilica was indicated the maximum CBR values. Additionally, in order to observe the influence of freeze- thaw cycles on CBR values of stabilized soil, several specimens, rebuilt in similar condition. After that, the samples are exposed to freezing- thawing cycles and results are compared. Results show a reduction in CBR values by freezing- thawing cycles; but almost 90 percent of this reduction was occurred in the first cycle and there were no significant decrease happened on the CBR values of the next cycles.