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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Journal of Civil Engineering and Vocational Education
Ochtharima, Zaerima Zahira
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Education Engineering Environmental Science Materials Science & Nanotechnology Physics Transportation

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The Compressive Strength of Unfired Clay Brick with MICP Reinforcement Ochtharima, Zaerima Zahira; Indriani, Andi Marini; Utomo, Gunaedy; Maslina, Maslina
CIVED Vol. 11 No. 3 (2024): September 2024
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cived.v11i3.637

Abstract

Industrial waste in the form of sewage sludge, which is often overlooked, can have significant environmental impacts, especially polluting groundwater and surface water sources. This pollution leads to degradation of water quality, reduces the availability of clean water, and affects ecosystems. To reduce these impacts, sewage sludge can be utilized in the manufacture of construction materials, such as bricks, which is considered an economical and environmentally friendly solution. Fireless brick making, in accordance with the concept of green building, avoids air pollution from the firing process. This study explores the use of Bacillus huizhouensis bacteria in the Microbially Induced Calcite Precipitation (MICP) method to improve the strength of fireless bricks. Bacillus huizhouensis, which can hydrolyze urea and produce calcium carbonate (CaCO₃) or calcite, was chosen for its ability to produce CaCO₃ under alkaline conditions. Bacillus Huizhouensis bacteria were used to strengthen bricks with 15%, 20%, and 25% bacteria concentration variations with culture ages of 8 hours, 10 hours, and 15 hours.  The results showed that the addition of 15% sewage sludge and 25% Bacillus huizhouensis bacterial solution with a culture age of 10 hours produced the highest compressive strength of 34.20 Kg/cm² (3.35 MPa), compared to sewage sludge bricks without bacteria (13.87 Kg/cm² or 1.36 MPa). Although showing significant improvement, this value is still below the SNI 15-2094-2000 standard of 50 Kg/cm² (5 MPa).
Unfired Bricks Green Material with Microorganism Biocementation Indriani, Andi Marini; Utomo, Gunaedy; Maslina; Az’Zahrah, Yuninda; Ochtharima, Zaerima Zahira
Jurnal Penelitian Pendidikan IPA Vol 10 No 12 (2024): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i12.9110

Abstract

The disposal of industrial sludge from Water Treatment Plants (WTP) poses environmental risks, particularly groundwater pollution. One solution is reusing this sludge in brick production, as clay use is unsustainable and may lead to shortages. This research investigates innovations in brick making, specifically using WTP sludge and the Microbially Induced Calcite Precipitation (MICP) technique with Bacillus huizhouensis to enhance brick strength. The MICP method produces calcium carbonate (CaCO₃) naturally, reinforcing bricks without harmful burning. After 50 days, compressive tests showed that bio-bricks with 15% WTP sludge and 25% bacteria achieved the highest strength of 3.79 MPa, compared to 1.49 MPa for mud bricks with only sludge. However, bio-bricks with 6% bacteria and 15% sludge reached only 1.74 MPa, with all values below the SNI 15-2094-2000 standard of 5 MPa.
Co-Authors Andi Marini Indriani, Andi Marini Az’Zahrah, Yuninda Maslina Maslina, Maslina Utomo, Gunaedy