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Engineering Geology
Volume 51, Issue 2, December 1998, Pages 89-107
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Copyright © 1998 Elsevier Science B.V. All rights reserved

Expansive characteristics of gypsiferous/anhydritic soil formations

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Shahid Azama, Sahel N. Abduljauwadb, *, Naser A. Al-Shayeab and Omar S. B. Al-Amoudib

a Department of Projects and Maintenance, KFUPM, Dhahran, Saudi Arabia

b Department of Civil Engineering, KFUPM, Dhahran, Saudi Arabia

Received 14 January 1998;
accepted 5 August 1998.
Available online 6 January 1999.


Geology and climatic and environmental conditions have led to the formation of expansive soils in the Eastern Province of Saudi Arabia. Calcium sulphate, which commonly occurs in such soils, is well known for phase transformation and dissolution. Phase changes from gypsum to anhydrite and vice versa, and dissolution of these phases, add to the potential hazards of local expansive soils. This paper discusses the behaviour of the expansive soil formations of eastern Saudi Arabia containing gypsum and anhydrite.

Author Keywords: Calcium sulphate; Dissolution; Expansive soil; Phase transformation

Article Outline

1. Introduction
2. Geology
3. Experimental
4. Geotechnical properties
5. Thermal analysis
6. X-ray diffraction analysis
7. Swell tests
8. Leaching tests
9. Conclusions

*Corresponding author. Fax: +966 3 860 2879; e-mail:

Engineering Geology
Volume 51, Issue 2, December 1998, Pages 89-107
- selected
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