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All Journal Jurnal Manajemen Teknologi dan Teknik Sipil (JURMATEKS)
Gunaedy Utomo
Program Studi Teknik Sipil, Fakultas Teknik Sipil Dan Perencanaan, Universitas Balikpapan, Balikpapan, Indonesia
Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Transportation

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Kuat Lentur Beton Menggunakan Agregat Batu Petangis dan Pasir Semboja dengan Penambahan Botol Plastik Topik Wahyu Widianto; Andi Marini Indriani; Gunaedy Utomo
Jurnal Manajemen Teknologi & Teknik Sipil Vol. 6 No. 2 (2023): DECEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jurmateks.v6i2.4989

Abstract

Utilizing local materials is a strategic step in optimizing concrete production in East Kalimantan. There's an example supply of petangis stone and semboja sand aggregates. Apart from that, using various wastes, including plastic waste, in concrete production is also a current issue. This study aims to investigate the potential substitution of fine aggregates with PET and combine them with local materials, to understand their impact on the bending strength of concrete.  The study tested concrete bending strength using 15x15x60 cm blocks with PET plastic substitutions at 0.30%, 0.45%, and 0.60% of sand weight, comparing them with PET-free concrete. The research results show that adding 0.30 and 0.45% PET plastic bottles causes a decrease in the flexural strength of concrete. This is related to the influence of changes in the composition of the concrete mix, including factors such as uneven aggregate distribution and less-than-optimal material binding. Flexural strength increases at a percentage of 0.60% by 3.7% or 3.3 MPa and shows better results than normal concrete. So the PET percentage can be used as a recommendation in making concrete using local materials such as petangis stone aggregate and semboja sand.
Permeabilitas Tanah Lanau Sebagai Temporary Landfill Cover yang Distabilisasi dengan Bakteri dan Larutan Sementasi Alfian Rahmadi; Andi Marini Indriani; Gunaedy Utomo
Jurnal Manajemen Teknologi & Teknik Sipil Vol. 6 No. 2 (2023): DECEMBER
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/jurmateks.v6i2.4998

Abstract

In the development of waste management, piles of rubbish can produce liquid waste called leachate. Leachate from landfills can affect human health and pollute the environment and aquatic biota because leachate contains various chemical compounds and many pathogenic bacteria. To minimize the impact of landfill waste on the surrounding environment, the waste is covered with material that can isolate it from the surrounding environment. This research aims to determine the optimal level of cementation solution addition to waste sludge as temporary landfill cover using the MICP method. The research results reveal that the sample permeability meets the criteria for a temporary cover landfill, where the permeability specification limits are between 10-4 to 10-5 cm/s. The research revealed that 0.25M cementation solution and Bacillus Subtilis bacteria had the lowest permeability. Soil without cementation solution has a permeability coefficient value of 5.04×10-4 cm/s, and decreases to 6.67×10-5 cm/s with a cementation solution concentration of 0.25M over a 28-day peram period. Variations in the 0.25M cementation solution showed its ability to reduce soil permeability by up to 86.7%. Permeability has decreased, which means the soil pores are getting smaller. Thus, this addition can reduce soil permeability and minimize the possibility of environmental damage by leachate.
Co-Authors Alfian Rahmadi Andi Marini Indriani Andi Marini Indriani, Andi Marini Topik Wahyu Widianto