The Grading Effect of Coarse Sand on Consolidated Undrained Strength Behaviour of Sand Matrix Soils
Bakhtiar Affandy Othman1, Aminaton Marto2, Nor Zurairahetty Mohd Yunus3, Tan Choy Soon4, Faizal Pakir5

1Bakhtiar Affandy Othman, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia.
2Aminaton Marto, Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia.
3Nor Zurairahetty Mohd Yunus, Department of Geotechnics and Transportation, School of Civil Engineering, Universiti Teknologi Malaysia, Johor, Malaysia.
4Tan Choy Soon, Country Garden Malaysia Region, Johor Bahru, Johor, Malaysia.
5Faizal Pakir, Faculty of Civil and Enviromental Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Johor, Malaysia.

Manuscript received on 24 January 2019 | Revised Manuscript received on 30 March 2019 | Manuscript published on 30 January 2019 | PP: 88-92 | Volume-7 Issue-6, March 2019 | Retrieval Number: E1970017519©BEIESP
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Abstract: In geotechnical engineering field, the behaviour of soil does rely much on the shear strength for design purpose. Previously, findings show that the change of grained size in soil will change the structure (microstructure) and behaviour of the soil; consequently, affected the strength. To date, limited study focused on the effect of grading on the behaviour of sand fine mixtures. This study aims to investigate the effect of coarse sand on undrained strength behaviour of sand matrix soils in comparison with clean sand. A series of test on reconstituted sand matrix soils had been carried out by conducting consolidated undrained (CU) triaxial test using GDS ELDYN® triaxial machine. Coarse sand (retain within 2.0 mm to 0.6 mm) was mixed with 0%, 10 %, 20%, 30%, and 40% of fine particles (kaolin) independently by weight to prepare reconstituted samples. Triaxial samples of 50 mm diameter and 100 mm height were prepared using wet tamping technique (5% of moisture content) with targeted relative density at 15% (loose state). Each reconstituted sample was sheared at two effective confining pressures of 100 kPa and 200 kPa, respectively. Results show that the gradation contributed to the behaviour of the sand matrix soils. Increasing percentage of coarse sand in sand matrix soils exhibited higher effective friction angle. Similar trends were also observed on the angularity effect on undrained shear strength parameters.
Keywords: Sand Matrix Soils, Coarse Sand, Consolidated Undrained, Cohesion, Friction Angles.
Scope of the Article: Behaviour of Structures