Sains Malaysiana 42(7)(2013): 881–891

Effects of Surfactant on Geotechnical Characteristics of Silty Soil

(Kesan SurfaktanTerhadap Ciri Geoteknik Tanah Berlodak)

Z.A. Rahman*, A.R. Sahibin, T. Lihan, W.M.R. Idris & M. Sakina

Pusat Pengajian Sains Sekitaran dan Sumber Alam, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia

Diserahkan: 18 Mei 2012/Diterima: 27 November 2012

ABSTRACT

Surfactants are often used as a cleaning agent for restoration of oil-contaminated soil. However the effect of surfactant on the geotechnical properties of soil is not clearly understood. In this study, the effects of surfactant on silty soil were investigated for consistency index, compaction, permeability and shear strength. Sodium dodecyl sulfate (SDS) was used in this study to prepare the surfactant-treated soil. Our results showed that the soil with added surfactant exhibited a decrease in liquid and plastic limit values. Maximum dry densities increased and optimum moisture contents decreased as contents of added surfactant were increased. The presence of surfactant assists the soil to achieve maximum density at lower water content. The addition of surfactant decreased the permeability of soil from 6.29×10-4 to 1.15×10-4 ms-1. The shear strength of soil with added surfactant was examined using the undrained unconsolidated triaxial tests. The results showed that the undrained shear strength, Cu was significantly affected, decreased from 319 kPa to 50 kPa for soil with 20% of added surfactant. The results of this study showed that the presence of surfactant in soil can modify the mechanical behaviour of the soil.

Keywords: Consistency index; geotechnical properties; residual soil; shear strength; surfactant

ABSTRAK

Surfaktan sering digunakan sebagai agen pembersih bagi membaik pulih tanah tercemar minyak. Walaupun begitu kesan surfaktan terhadap sifat geoteknik tanah tidak jelas. Dalam kertas ini, kesan surfaktan tehadap tanah berlodak dikaji berdasarkan indeks ketekalan, pemadatan, ketelapan dan kekuatan ricih. Natrium dodesil sulfat (SDS) telah digunakan dalam kajian ini untuk menyediakan tanah terawat surfaktan. Keputusan menunjukkan tanah yang ditambah surfaktan mempamerkan penurunan nilai-nilai had cecair dan plastik. Ketumpatan kering maksimum meningkat dan kandungan lembapan optimum menurun dengan peningkatan kandungan surfaktan. Kehadiran surfaktan membantu tanah untuk mencapai ketumpatan maksimum pada kandungan air yang lebih rendah. Penambahan surfaktan menurunkan ketelapan tanah daripada 6.29×10-4 ke 1.15×10-4 ms-1. Kekuatan ricih tanah yang ditambah surfaktan diuji menggunakan ujian tiga paksi tidak terkukuh tidak bersalir. Keputusan menunjukkan kekuatan ricih tidak bersalir, Cu adalah jelas dipengaruhi, menyusut daripada 319 kPa ke 50 kPa bagi tanah ditambah 20% surfaktan. Keputusan kajian ini menunjukkan bahawa kehadiran surfaktan dalam tanah boleh mengubah kelakuan mekanik tanah.

Kata kunci: Cirian geoteknik; indeks ketekalan; kekuatan ricih; tanah baki

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