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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Civil Engineering Journal
Lujaya, Jason
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Civil Engineering, Building, Construction & Architecture

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Uji CBR (California Bearing Ratio) pada Tanah Lempung Stabilisasi Abu Marmer dan Biogrouting Waruwu, Aazokhi; Pangemanan, Indah; Yunita, Yulia; Calvin, Fransiscus; Lujaya, Jason; Wijaya, Nehemia
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 1 (2024)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i1.58304

Abstract

Tanah dasar yang ada untuk konstruksi jalan cukup beragam, ada kalanya tidak memenuhi standar sebagai tanah dasar konstruksi. Upaya perbaikan diperlukan apabila tanah yang ada memiliki nilai CBR (California Bearing Ratio) yang cukup rendah. Bahan stabilisasi untuk perbaikan tanah dapat menggunakan limbah berupa abu marmer dan sebagai pembanding dalam penelitian ini juga dilakukan perbaikan dengan metode biogrouting. Tujuan penelitian ini adalah untuk mendapatkan pengaruh stabilisasi abu marmer dan biogrouting terhadap nilai CBR. Penelitian dilakukan melalui uji CBR pada model fisik tanah yang distabilisasi 3-6% abu marmer dan tanah dengan perbaikan menggunakan bakteri bacillus subtilis dan bacillus amyloliquefaciens. Pengujian dibedakan berdasarkan tebal tanah stabilisasi 10-30 cm. Hasil penelitian menunjukkan bahwa tanah stabilisasi abu marmer menghasilkan peningkatan nilai CBR yang lebih baik dibandingkan tanah yang diperbaiki dengan metode biogrouting. Nilai CBR yang memenuhi standar untuk tanah dasar konstruksi jalan didapatkan pada tanah dengan stabilisasi 6% abu marmer dengan tebal lapisan tanah stabilisasi minimum 20 cm.
Performance of Soil Biogrouting as a Subgrade Material of the Road Pavement Widjajakusuma, Jack; Waruwu, Aaazokhi; Kusnadi, Yulia Yunita; Lujaya, Jason; Wibowo, Kevin Aprilio
Civil Engineering Journal Vol. 11 No. 10 (2025): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-10-017

Abstract

Soft clay subgrade is unsuitable for road pavement because it has low bearing capacity and CBR value. Therefore, the soil needs stabilization, but with a sustainable stabilization method. One of these methods is biogrouting, namely grouting, which uses bacteria. Thus, the main objective of this study was to determine the performance of Bacillus subtilis and Bacillus amyloliquefaciens bacteria in stabilizing the soil. The performance of these bacteria was quantified by the CBR value and soil-bearing capacity experimentally in a laboratory model test with each soil thickness of 0-30 cm. The CBR value of the soil improved by the biogrouting method by about 4 times the CBR value of untreated soil. The increase in bearing capacity was obtained about 4 times for treated soil with Bacillus subtilis and about 5 times for treated soil with Bacillus amyloliquefaciens. The layer thickness significantly improves the performance of the subgrade at a layer thickness of 20 cm. The new result of this study is that both bacteria are native Indonesian bacteria, so they are suitable for use in Indonesia. In addition, Bacillus amyloliquefaciens has never been used in research to increase soil-bearing capacity.
Co-Authors Aazokhi Waruwu Calvin, Fransiscus Jack Widjajakusuma Kevin Aprilio Wibowo Kusnadi, Yulia Yunita Pangemanan, Indah Waruwu, Aaazokhi Wijaya, Nehemia Yunita, Yulia