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Predicting Long-term Soaked CBR of Gypsiferous Subgrade Soils
Nahrain University.
Nahrain University.ORCID iD: 0000-0003-0478-1150
2006 (English)In: Proceedings of the Institution of Civil Engineers: Transport, ISSN 0965-092X, E-ISSN 1751-7710, Vol. 159, no 3, p. 135-140Article in journal (Refereed) Published
Abstract [en]

Thirty-two laboratory California Bearing Ratio (CBR) tests were carried out on a CH gypsiferous subgrade soil with an initial gypsum content of 34%. The soil samples were prepared according to ASTM D 1883-99 at 95% of the maximum modified AASHTO dry density. For each 40 Ib (178 N) and 70 Ib (311-5 N) surcharge load, eight pairs of CBR samples were prepared, and soaked for periods of 0, 4, 7, 15, 30, 60, 120 and 180 days respectively. To develop a general empirical formula for predicting long-term soaked CBR from unsoaked CBR, use was made of available results on CH soil with a gypsum content of 15%, on granular gypsiferous soils of the SW-SM group with a gypsum content of 64%, and on SM soils with gypsum contents of 34% and 61%. The empirical equation developed in this paper enables the soaked CBR to be determined from the unsoaked CBR for all types of gypsiferous soil and for any surcharge load and soaking period. The equation's validity was examined using six different gypsiferous soils (eight case studies) including both granular and fine-grained soils. This paper also shows the invalidity of Fekpe's empirical equation in modelling the long-term behaviour of gypsiferous soils.

Place, publisher, year, edition, pages
2006. Vol. 159, no 3, p. 135-140
Keywords [en]
Gypsum, Subgrade, Soil, Modulus of elasticity, Moisture content, Variability, Mathematical model, Strength, Stiffness, California bearing ratio
National Category
Soil Science
Research subject
60 Road: Soil and geotechnics, 62 Road: Soil mechanics
Identifiers
URN: urn:nbn:se:vti:diva-13213ISI: 000240028600006Scopus ID: 2-s2.0-33748574596OAI: oai:DiVA.org:vti-13213DiVA, id: diva2:1241272
Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2018-11-19Bibliographically approved

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Kuttah, Dina K

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