Efektifitas Metode Biosementasi Menggunakan Inokulum Tempe dan Presipitasi Kalsit Berbasis Kedelai untuk Perbaikan Tanah Pasir

Abstract

Tanah berpasir memiliki ikatan antarpartikel yang lemah sehingga memerlukan perbaikan. Metode Soybean Crude Urease Carbonate Precipitation (SCU-CP) berpotensi menghasilkan CaCO3 secara ramah lingkungan. Stabilisasi berbasis jamur mampu membentuk jaringan miselium sebagai pengikat tanah, tetapi memiliki keterbatasan dalam ketahanan jangka panjang. Penelitian ini bertujuan menganalisis pengaruh penambahan jamur pada SCU-CP serta mengevaluasi pengaruh metode treatment terhadap stabilitas tanah pasir. Kinerja SCU-CP dievaluasi melalui pengujian hidrolisis urea dan presipitasi CaCO3. Stabilitas tanah dianalisis menggunakan pengujian Unconfined Compressive Strength (UCS), pengamatan mikroskopis, curing time, dan soaking time. Hasil penelitian menunjukkan penambahan inokulum tempe tidak mempengaruhi kinerja larutan. Kondisi optimum diperoleh pada 5% kadar air dan 5% dosis inokulum dengan nilai UCS 70,58 kPa. Miselium berfungsi sebagai matriks pengikat dan situs nukleasi CaCO3. Kombinasi miselium dan SCU-CP mampu mempertahankan 70,1% kekuatan awal setelah 3 hari perendaman.

Sandy soil has weak interparticle bonds and therefore requires improvement. The Soybean Crude Urease Carbonate Precipitation (SCU-CP) method has the potential to produce CaCO3 in an environmentally friendly manner. Fungus-based stabilization can form a mycelial network to bind the soil, but it has limitations in terms of long-term durability. This study aims to analyze the effect of adding fungi to the SCU-CP process and to evaluate the impact of treatment methods on the stability of sandy soil. The performance of SCU-CP was evaluated through urea hydrolysis and CaCO3 precipitation tests. Soil stability was analyzed using Unconfined Compressive Strength (UCS) testing, microscopic observation, curing time, and soaking time. The results showed that the addition of tempeh inoculum did not affect the solution’s performance. Optimal conditions were achieved at 5% moisture content and a 5% inoculum dose, yielding a UCS value of 70.58 kPa. The mycelium functions as a binding matrix and a nucleation site for CaCO3. The combination of mycelium and SCU-CP retained 70.1% of its initial strength after 3 days of soaking