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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*Pengarang
untuk surat-menyurat; email: fahmirina@gmail.com
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