Perbaikan Kuat Geser Tanah Gambut Menggunakan Enzyme Induce Calcite Precipitation (Studi Kasus Daerah Desa Buana Makmur Km 55 Kecamatan Dayun, Kabupaten Siak)

Suganda, Agung Dhimas (2022) Perbaikan Kuat Geser Tanah Gambut Menggunakan Enzyme Induce Calcite Precipitation (Studi Kasus Daerah Desa Buana Makmur Km 55 Kecamatan Dayun, Kabupaten Siak). Other thesis, Universitas Islam Riau.

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Abstract

In world of civil engineering construction that is built on peat soil, there are many problems that must be faced, for example the shear strength of the peat soil. This can be dangerous and detrimental to the construction of the building above it. This study aims to determine the effect of the addition of enzyme varieties on the shear strength of peat soil using the Enzyme Induce Calcite Prepicitation method The original peat soil was taken at the location of Buana Makmur Village km 55 Dayun District, Siak Regency, the soybean ingredients came from a daily shop in Pekanbaru city and additional materials used were CaCl2 and Urea from Bandung producers. This research method refers to the ASTM (American Society for Testing and Materials) and SNI procedures. The test object was made using a modified sondir tool with a cylindrical shape with a diameter of 3.64 cm and a height of 10.75 cm2, the object was made according to standard compaction at an optimum moisture content of 157%. The shear strength test was carried out after adding soybean enzyme reagent with variations of 0%, 5%, 10%, 15%, 20%, and 25%. The data obtained from the results of this test are processed in the form of tables and graphs according to variations in the addition of soy enzyme reagents. The effect of the addition of soybean enzyme reagent resulted in a higher shear strength than the original soil, so it was related to the bearing strength of the peat soil. The results of testing the physical properties of the original peat soil revealed that the soil originating from the location of Buana Makmur Village km 55 Dayun District, Siak Regency was classified as peat soil with a moisture content of 407.5% and specific weight (Gs) = 1.3. From the results of the shear strength test of the original soil specimen with variations in the enzyme reagent mixture at the percentages of 0%, 5%, 10%, 15%, 20%, and 25%, the value of the free compressive strength of the original soil specimen + the addition of 0% enzyme reagent is 0.71 kg/cm2, while the highest shear strength value was found in the addition of 5% enzyme reagent of 0.90 kg/cm2.

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