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All Journal JURNAL POLI-TEKNOLOGI Retensi
lelly marini
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KARAKTERISASI SIFAT FISIK DAN MEKANIK TANAH TIMBUNAN BABALESI YANG BERDASAR DARI LIMBAH BAUKSIT DAN BAKTERI PROBIOTIK: KARAKTERISASI SIFAT FISIK DAN MEKANIK TANAH TIMBUNAN BABALESI YANG BERDASAR DARI LIMBAH BAUKSIT DAN BAKTERI PROBIOTIK marini, lelly; Hariyani, susi; Purnama, Ikhwan Arief
RETENSI Vol. 2 No. 1 (2021): Retensi
Publisher : Jurusan Teknik Sipil Polnep

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31573/retensi.v2i1.405

Abstract

Bauxite waste in the form of red mud is known as waste could pollute water and soil in theenvironment around the mining area and endanger public health if not given advance prevention. Bythe increasing amount of waste and the growing amount of bauxite production, this problem becomeimportant 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 usingprobiotic bacteria as a modifier. The feasibility and potential testing of Babalesi soil is carried out byphysical and mechanical tests of the soil based on ASTM Standards. These tests produce parametersthat refer to the AASHTO and USCS Classifications to determine the requirements for embankment2soil. 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 soilshowed A-4 classification, namely silt soil with medium quality. Meanwhile, the mechanical test forboth conditions, namely the original red mud condition and the Babalesi soil condition, could not becarried out because even in dry conditions, Babalesi soil proved to be very hard, but if it was inwatery conditions as a procedure in the mechanical test, it could not be formed and the mechanicalparameters could not be measured. The results of the physical test concluded that Babalesi landfillmeet the requirements and could be recommended as a road construction embankment. Themanufacture of Babalesi soil could be carried out directly in the waste pond by layered way usingheavy equipment as a stirrer of bacterial solution and bauxite waste.
PERBAIKAN SIFAT KIMIA RED MUD(RM) DENGAN MENGGUNAKAN BAKTERI PROBIOTIK: PERBAIKAN SIFAT KIMIA RED MUD(RM) DENGAN MENGGUNAKAN BAKTERI PROBIOTIK marini, lelly; Hariyani, susi; Anggraini, irene
RETENSI Vol. 2 No. 1 (2021): Retensi
Publisher : Jurusan Teknik Sipil Polnep

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31573/retensi.v2i1.428

Abstract

ed mud (RM) is waste from a series of bauxite mining processes, with the amount of RM producedaround 1.2 – 1.4 tons for every 1 tonne of alumina produced. RM has chemical properties that are quitedangerous because in addition to containing a lot of non-degradable metals, it also contains a strong base witha pH of around 13-14. If released in its original condition, RM is very dangerous because it could cause waterand soil pollution in the mining environment and could cause disease in humans. All the time, the handling ofRM is by making tailing dam or piling up the subsoil of the highway in the area around the mine which costs alot of money to restore the pH close to neutral before use because the requirement to be released into theenvironment around the allowable pH value is a minimum of 9. Therefore, in this study, the author uses asolution, namely by utilizing the biological activity of probiotic bacteria microorganisms, it could live in analkaline environment and are safe for humans and environmentally friendly. By mixing RM with activatedprobiotic bacteria which will be carried out direct observation of the sample and measuring the pH value. Witha total sample of 27 samples based on variations in the number of active probiotic bacteria mixed and theincubation time of bacteria, the results showed that the more active probiotic bacteria were mixed into the RMand the longer the incubation time of the bacteria, the pH indicator showed close to neutral, namely 8-9. It isalso supported by direct observations based on shape, color, smell and touch, showing that the harmfulchemical properties of RM are decreasing.
Analisa Perbandingan Komposisi Agregat Halus Pasir Kuarsa dan Fly Ash pada Beton Geopolymer Berbasis Binder Kalium Hidroksida Terhadap Kuat Tekan dan Daya Serap Beton Indah Rosanti; Rona Ariyansyah; Satriyo Utomo; Lelly Marini; Indah Permatasary; Mega Septiani Mega
Jurnal Poli-Teknologi Vol. 23 No. 1 (2024)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v23i1.6037

Abstract

The development of concrete construction has the impact of increasing cement production anddamaging the balance of nature because every 1kg of cement production produces CO2 emissionsof 0.5 - 0.7 kg. To reduce this iMPact, geopolymer concrete innovation was formed. Geopolymerconcrete is formed from the polymerization reaction of silica (Si) and alumina (Al) compoundsfound in quartz sand and fly ash waste from burning coal which has binding properties like cement.Fly ash reacts with alkaline activators of potassium hydroxide (KOH) and sodium silicate(Na2SiO3). The research method used is a quantitative method with experimental studies in thelaboratory. Geopolymer concrete mix design refers to previous research. Geopolymer concrete testobjects are cylindrical with a size of 100 x 200 mm. There are 2 variations of the composition ofalkali activator forming geopolymer concrete, namely 8M KOH concentration, alkali activatorratio of 1:1 mol ratio and 10M KOH, alkali activator ratio of 1:1.5 mol ratio. The composition offly ash and quartz sand for each binder was 20%:80%, 40%: 60%, 50% : 50%, 60% : 40%,80%:20% with a total of 36 samples. Testing compressive strength and absorption at the age of 14and 28 days. The results of the compressive strength obtained ≤ 50 MPa where the concrete doesnot include high quality concrete and not for the needs of precast construction. The results ofaverage concrete absorption reached 3,72%, which already met the permissible absorption of amaximum of 10%. Keywords: Fly Ash, Quartz Sand, Potassium Hydroxide, Geopolymer Concrete.
Co-Authors Hariyani, Susi ikhwan Arief Purnama Indah Permatasary Indah Rosanti Irene anggraini Mega Septiani Mega Rona Ariyansyah Satriyo Utomo