KARAKTERISASI SIFAT FISIK DAN MEKANIK TANAH TIMBUNAN BABALESI YANG BERDASAR DARI LIMBAH BAUKSIT DAN BAKTERI PROBIOTIK

lelly marini; susi Hariyani; Ikhwan Arief Purnama

doi:10.31573/retensi.v2i1.405

lelly marini Politeknik Negeri Pontianak
susi Hariyani Politeknik Negeri Pontianak
Ikhwan Arief Purnama Politeknik Negeri Pontianak

DOI: https://doi.org/10.31573/retensi.v2i1.405

Abstract

Bauxite waste in the form of red mud is known as waste could pollute water and soil in the
environment around the mining area and endanger public health if not given advance prevention. By
the increasing amount of waste and the growing amount of bauxite production, this problem become
important issue for the mining sector, the government and the surrounding public directly affected.
Utilization on a large scale and environmentally friendly are the points in this bauxite waste solution.
The Babalesi landfill for road construction is a consideration in utilizing bauxite waste by using
probiotic bacteria as a modifier. The feasibility and potential testing of Babalesi soil is carried out by
physical and mechanical tests of the soil based on ASTM Standards. These tests produce parameters
that refer to the AASHTO and USCS Classifications to determine the requirements for embankment
2
soil. For the physical test in the initial test of the red mud condition, the parameters indicated the A-7-
6 classification, namely clay with poor quality. Furthermore, the physical test on Babalesi soil
showed A-4 classification, namely silt soil with medium quality. Meanwhile, the mechanical test for
both conditions, namely the original red mud condition and the Babalesi soil condition, could not be
carried out because even in dry conditions, Babalesi soil proved to be very hard, but if it was in
watery conditions as a procedure in the mechanical test, it could not be formed and the mechanical
parameters could not be measured. The results of the physical test concluded that Babalesi landfill
meet the requirements and could be recommended as a road construction embankment. The
manufacture of Babalesi soil could be carried out directly in the waste pond by layered way using
heavy equipment as a stirrer of bacterial solution and bauxite waste.

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