Behaviour of fine-grained gypsum-rich soil under triaxial tests

Author:

Razouki Sabah Said1,Kuttah Dina K.2ORCID

Affiliation:

1. Former Professor, Civil Engineering, College of Engineering, Al-Nahrain University, Baghdad, Iraq

2. Researcher at the Swedish National Road and Transport Research Institute (VTI), Linköping, Sweden (corresponding author: )

Abstract

This study presents the unconsolidated undrained (UU) and consolidated undrained (CU) behaviour of a compacted gypsum-rich sandy lean clay with a total soluble salt content of 35% and a gypsum content of 33%. The compaction curve of the soil exhibits a double peak indicating two maximum dry densities and two optimum moisture content (OMC) values for the standard American Association of State Highway and Transportation Officials (Aashto) compaction effort. For triaxial testing, soil specimens were compacted at the wet OMC. UU triaxial tests on both unsoaked and 120 d soaked specimens in fresh water indicate a significant decrease of soil cohesion and angle of internal friction due to long-term soaking. An increase of compaction effort from that of standard Aashto to that of modified Aashto improved both soil strength parameters. CU triaxial tests were carried out on specimens compacted at standard Aashto compaction in a manufactured mould to prepare the triaxial soil specimens. The test results revealed that the stress paths for the tested samples differ markedly from those displaying the behaviour of overconsolidated soils, as discussed in detail in this paper.

Publisher

Thomas Telford Ltd.

Subject

Mechanics of Materials,General Materials Science,Civil and Structural Engineering

Reference47 articles.

1. Ahmed KI (2013) Effect of Gypsum on the Hydro-Mechanical Characteristics of Partially Saturated Soil. PhD thesis, Geo-Environmental Research Centre, Cardiff School of Engineering, Cardiff University, Cardiff, UK.

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