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STUDI PERBAIKAN TANAH RESIDUAL TROPIS MENGGUNAKAN ADDITIVE XANTHAN GUM
Tanah residual tropis memiliki kekuatan dan stabilitas rendah akibat pelapukan intensif dan curah hujan tinggi, sehingga menjadi tantangan dalam konstruksi dan stabilisasi tanah. Metode stabilisasi konvensional seperti semen memang mampu meningkatkan kekuatan tanah, namun menimbulkan dampak lingkungan signifikan berupa emisi karbon tinggi dan konsumsi energi besar. Penelitian ini menggunakan metode true eksperimen untuk mengevaluasi pengaruh xanthan gum (XG) sebagai bahan penstabil ramah lingkungan terhadap sifat mekanik dan permeabilitas tanah residual tropis, baik pada kondisi kering maupun setelah perendaman. Pengujian dilakukan melalui karakterisasi sifat fisik, Unconfined Compressive Strength (UCS), Triaxial Unconsolidated Undrained (UU), dan permeabilitas metode Falling Head. Hasil klasifikasi menunjukkan tanah termasuk lanau plastisitas tinggi (MH) dengan berat kering maksimum 1,26 g/cm³ dan kadar air optimum 37%. Penambahan XG meningkatkan UCS dari 7,43 kg/cm² (0% XG) menjadi maksimum 19,08 kg/cm² pada kadar 3% XG, yang merupakan kadar optimum peningkatan kekuatan tekan bebas, sebelum menurun pada kadar lebih tinggi. Pada kondisi kering, kohesi meningkat dari 3,15 kg/cm² (0% XG) menjadi 8,00 kg/cm² (3% XG), sedangkan sudut geser dalam menurun dari 6,50° menjadi 2,05°. Pada kondisi jenuh, XG masih meningkatkan kuat geser dibandingkan tanah tanpa stabilisasi, namun tegangan deviator menurun sekitar 86,47% hingga 88,88% dibandingkan kondisi kering. Permeabilitas menurun sekitar 92%, dari 2,6350 × 10⁻⁶ cm/s menjadi 1,937 × 10⁻⁷ cm/s pada kadar 3% XG. Selain itu, Plasticity Index meningkat dari 22,4 (0% XG) menjadi 56,4 (6% XG), yang mengindikasikan potensi masalah kembang-susut pada tanah terstabilisasi XG. Tropical residual soils generally exhibit low strength and stability due to intensive weathering and high rainfall, posing significant challenges for construction and soil stabilization. Conventional stabilization methods such as cement can improve soil strength but have substantial environmental impacts, including high carbon emissions and considerable energy consumption. Using True Experiment method, this study aims to evaluate the effect of xanthan gum (XG) as an environmentally friendly stabilizing agent on the mechanical and permeability properties of tropical residual soils under both dry and soaked conditions. The experimental program included physical characterization, Unconfined Compressive Strength (UCS), Triaxial Unconsolidated Undrained (UU), and permeability testing using the Falling Head method. The soil was classified as high-plasticity silt (MH) with a maximum dry density of 1.26 g/cm³ and an optimum moisture content of 37%. The addition of XG increased UCS from 7.43 kg/cm² (0% XG) to a maximum of 19.08 kg/cm² at 3% XG, which represents the optimum content for enhancing UCS, before decreasing at higher contents. Under dry conditions, cohesion increased from 3.15 kg/cm² to 8.00 kg/cm² (3% XG), while the internal friction angle decreased from 6.50° to 2.05°. In soaked conditions, XG still improved shear strength compared to untreated soil, although deviator stress decreased by approximately 86.47% to 88.88% compared to dry conditions. Permeability was reduced by up to 92%, from 2.6350 × 10⁻⁶ cm/s to 1.937 × 10⁻⁷ cm/s at 3% XG. Additionally, the Plasticity Index increased from 22.4 (0% XG) to 56.4 (6% XG), indicating a potential swelling–shrinkage problem in XG-stabilized soils
KODEPRODI22201#Teknik Sipil_S1, Universitas Pendidikan Indonesia
STUDI PERBAIKAN TANAH RESIDUAL TROPIS MENGGUNAKAN ADDITIVE XANTHAN GUM (Text)
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TA Engineering (General). Civil engineering (General)