Sains Malaysiana 46(1)(2017): 97–106

http://dx.doi.org/10.17576/jsm-2017-4601-13

Compressibility Characteristics of Compacted Clay Treated withCement,

Peat Ash and Silica Sand

(Ciri Kebolehmampatan Tanah Liat Terpadat Dirawat dengan Simen, Abu Gambut dan Pasir Silika)

SEYEDESMAEIL MOUSAVI* & LEONG SING WONG

Department of Civil Engineering, College of Engineering, Universiti Tenaga Nasional, IKRAM-UNITEN Road, 43000 Kajang, Selangor Darul Ehsan, Malaysia

Received: 7 August 2015/Accepted: 22 April 2016

ABSTRACT

This paper investigates the compressibility characteristics of compacted clay treated with cement, peat ash and silica sand. For this purpose, one dimensional consolidation tests were conducted to determine the soil consolidation properties. The test specimens were trimmed from the compaction test specimen. The 1D consolidation test specimen was subjected to the normal pressures of 2.5, 5, 10, 20, 40, 80 and 160 kPa in sequence on the test specimen which was saturated with distilled water. At the end of the loading period of 80 kPa, the vertical load was removed and the specimen was allowed to expand for 24 h for the purpose of evaluating of its swelling behavior. The results showed that void ratio of the soil specimens decreased with increasing effective normal pressure. The laboratory investigation clearly demonstrates that, settlement is as the compression of a soil specimen due to vertical loading applied at the top surface of the 1D consolidation test specimen. It was concluded that, the compression settlement of the stabilized soil with the binder composition of 18% cement, 2% peat ash and 5% silica sand improved by almost 1.3-fold. A notable discovery is the suitability of the stabilized soil for road embankment and low lying marginal area for foundation works; also solving the environmental problems in relation to peaty ground. However, sufficient laboratory and field testing are required.

Keywords: Compressibility; road embankment; soft clay; 1D consolidation

ABSTRAK

Kertas ini mengkaji ciri kebolehmampatan tanah liat terpadat yang dirawat dengan simen, abu gambut dan pasir silika. Bagi tujuan ini, satu ujian penyatuan dimensi telah dijalankan untuk menentukan sifat konsolidasi tanah. Spesimen ujian telah dipotong daripada spesimen ujian pemadatan. Spesimen ujian konsolidasi 1D adalah tertakluk kepada tekanan normal 2.5, 5, 10, 20, 40, 80 dan 160 kPa dalam turutan ujian spesimen yang telah ditepu dengan air suling. Pada akhir tempoh pemuatan 80 kPa, beban menegak telah dihapuskan dan spesimen itu dibiarkan untuk berkembang selama 24 jam bagi tujuan menilai tingkah laku pembengkakan. Hasil kajian menunjukkan bahawa nisbah batal bagi spesimen tanah menurun dengan peningkatan tekanan normal yang berkesan. Kajian makmal dengan jelas menunjukkan bahawa penyelesaian adalah seperti pemampatan spesimen tanah yang disebabkan oleh beban menegak yang diguna pakai di atas permukaan spesimen ujian pengukuhan 1D. Ia menunjukkan bahawa penyelesaian mampatan tanah stabil dengan komposisi pengikat 18% simen, 2% abu gambut dan 5% pasir silika meningkat sebanyak hampir 1.3-lipatan. Satu penemuan yang ketara ialah kesesuaian tanah stabil bagi tambak jalan dan kawasan marginal rendah untuk kerja-kerja asas; juga menyelesaikan masalah alam sekitar berkaitan tanah gambut. Walau bagaimanapun, ujian makmal dan lapangan adalah perlu.

Kata kunci: Kebolehmampatan; konsolidasi 1D; tambak jalan; tanah liat lembut

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*Corresponding author; email: mousavi@khiau.ac.ir