Effect of Carbonation on the Collapse Potential of Magnesium Oxide Treated Gypseous Soil

Document Type : Original Article

Authors

Civil Engineering Department, University of Technology, Baghdad, Iraq

Abstract

Collapsible soils are soils susceptible to large volumetric strains when they become saturated. Numerous soil types fall in the general category of collapsible soils, including gypseous soil which is characterized by relatively low density, appreciable strength and stiffness in the dry state, but is susceptible to significant deformations as a result of wetting. The aim of this study is to investigate the effectiveness of curing period time of carbonation on magnesium oxide stabilization of gypseous soil. In this research, magnesium oxide is used to improve a collapsible gypseous soil by using (0, 5, 10 and 15%) with two relative densities (35 and 75%) and carbonation at different carbonation periods (0, 1, 3 and 24 hours). Conventional collapse tests, single oedometer and double odeometer and modified collapse test are used in this research to investigate the effect of carbonation periods on the improvement of the soil. The modified collapse test apparatus is used. The results illustrated that the collapse potential decreased more than 65% and 55% for the carbonated soil without treatment for conventional tests and modified collapse test, respectively. A decreased about 55% for treated soil with 10% magnesium oxide and carbonated for 3 hours for both of conventional tests and modified collapse test. The carbonation period time is used to accelerate the improvement of the soil as well as decreased the collapse potential and the results showed that no clear change in collapse potential for the period time more than 3 hours.

Keywords

Main Subjects

References

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International Journal of Engineering
Volume 35, Issue 4
TRANSACTIONS A: Basics
April 2022
Pages 706-714

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