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Sains Malaysiana 54(2)(2025): 377-388
http://doi.org/10.17576/jsm-2025-5402-05
Kesan Rawatan Dolomit terhadap Kekuatan Mampatan Tanah Jerlus dari Kawasan Penanaman Padi MADA, Kedah
(Effect of Dolomite Treatment on
Compressive Strength of Soft Soil from MADA Paddy Growing Area, Kedah)
Nadhirah Mursidi*, Mohamed Fauzi Md Isa &
Azimah Hussin
Program Geologi, Jabatan Sains Bumi dan Alam Sekitar, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor, Malaysia
Received: 8 May
2024/Accepted: 17 October 2024
Abstrak
Isu tanah jerlus di kawasan penanaman padi Lembaga Kemajuan Pertanian Muda (MADA) menjadi ancaman besar kepada para petani kerana ia mampu menjejaskan kebolehkerjaan tanah sawah dan jumlah pengeluaran beras negara. Tanah jerlus merupakan tanah tidak subur yang berkelimpahan mineral lempung, mudah dimampatkan, kekuatan mekanikal yang rendah dan kebolehtelapan yang rendah. Kajian ini telah dilakukan untuk meneliti keberkesanan dolomit terhadap cirian mekanikal tanah jerlus dari kawasan kajian. Penambahan dolomit sebagai bahan penstabil telah dilakukan mengikut nisbah 3%, 6%, 9% dan
12% daripada berat kering tanah jerlus dan diawet selama 3, 7, 14
dan 28 hari. Hasil kajian yang diperoleh menunjukkan tanah jerlus dari kawasan kajian mempunyai pH yang neutral (7.64-7.68), berkelembapan tinggi (57.85-66.62%), tinggi kandungan organik (8.37-10.69%), mempunyai nilai indeks keplastikan yang tinggi (17.63-17.69%), memiliki nilai graviti tentu 2.23-2.28 dan bertekstur lempung berlodak. Penambahan dolomit sebagai bahan tambahan rawatan telah dikesan dapat mengurangkan kekuatan mekanikal tanah jerlus. Berdasarkan ujian kekuatan mampatan tidak terkekang (UCS), penambahan 12% dolomit merupakan nilai optimum yang dapat meningkatkan kekuatan tanah jerlus dalam keadaan direndam dan tidak direndam (41.95-679.3 kPa) dengan tempoh rawatan yang berbeza.
Kata kunci: Dolomit; sifat fizikokimia; tanah jerlus
Abstract
The
issue of soft soil in the paddy cultivation area of the Muda Agricultural
Development Authority (MADA) poses a significant threat to farmers as it can
undermine the viability of paddy fields and the country’s rice production. The
soft soil is an infertile soil, abundant with clay minerals, easily compressed,
low mechanical strength, low permeability, and high potential for failure.
Accordingly, this study was carried out to examine the effectiveness of
dolomite stabilizers against the mechanical characteristics of soft soils from
the study area. The addition of dolomite as a stabilizing material was carried
out in the ratio of 3%, 6%, 9%, and 12% of the dry weight of the soft soil and
was cured for 3, 7, 14, and 28 days. The results showed that the soft soil from
the study area had a neutral pH (7.64-7.68), high moisture content
(57.85-66.62%), high organic content (8.37-10.69%), a high plasticity index
value (17.63-17.69%), a specific gravity value of 2.23-2.28, and a silty clay
texture. The addition of dolomite as a treatment additive has been detected to
reduce the mechanical strength of the soft soil. Based on the unconfined
compressive strength (UCS) test, the addition of 12% dolomite is the optimum
value that can enhance the strength of soft soil in both saturated and
unsaturated conditions (41.95-679.3 kPa) with varying treatment durations.
Keywords:
Dolomite; physicochemical characteristic; soft soil
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