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Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia
Published by Universitas Tribhuwana Tunggadewi
ISSN : 25033654     EISSN : 25032682     DOI : -
Core Subject : Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science Industrial & Manufacturing Engineering
Focus and Scope of this journal are : Chemical Engineering including : bioenergy processing, environmental engineering, natural resource management, Heat and Mass Transfer, Chemical Reaction, Analytical Chemistry, Biochemistry, Designing tools and chemical processes, Chemical industry process, Computing and modeling (simulation) process, Particle and nano technology, membrane technology, esessential oil technology, and phytopharmaca, etc. Civil Engineering including : technology of construction materials, transportation system, environmental layout, concrete and wood structures, steel construction, bridge and dam construction, management of water resources and Hydrology, earthquake engineering, sanitation systems and urban drainage.
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Articles 182 Documents
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The Effect of Addition LDPE Plastic on Porous Asphalt Mixture Saputra, Muhammad Yodhi; Agustien, Melawaty; Kadarsa, Edi
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.4607

Abstract

Many recent studies have used plastic waste as an ingredient in conventional asphalt mixtures. However, they did not notice that the addition of plastics can reduce the permeability of asphalt mixtures, which means that porous asphalt is a better plastic trash that will be added to a specific type of asphalt mixture. Despite having a low marshall value, porous asphalt provides a benefit in terms of permeability. Low-density polyethylene (LDPE), a form of plastic trash employed in this study, boosted the Marshall stability mark. This study changed porous asphalt by adding LDPE plastic for usage on the field, then tested for marshall stability and permeability. A porous asphalt mixture should be created as a result of this study's findings with the highest percentage of plastic content without reducing its permeability classification, considering the percentage of plastic used. It is equally essential, and evaluating the wheel tracking machine will help gather more information about its resistance to deformation. The permeability test of porous asphalt with the addition of plastic at 0%, 5%, 10%, 15%, and 20%, respectively, produced findings that were 0.2002 cm/s, 0.1507 cm/s, 0.1131 cm/s, and 0.0897 cm/s. The results of the Marshall stability check on porous asphalt with the percentage of added plastic starting from 0, 5, 10, 15, and 20 percent show values of 571.52 kilograms, 716.9067 kilograms, 731.9467 kilograms, 817.1733 kilograms, and 912 .4267 kilograms. In the wheel tracking machine test, it works well for dynamic stability values at a plastic percentage of 20%, or 7159.091 passes/mm.ABSTRAKBanyak penelitian telah menggunakan limbah plastik sebagai bahan campuran aspal konvensional beberapa tahun terakhir. Namun, mereka tidak memperhatikan bahwa plastik dapat mengecilkan permeabilitas campuran aspal, yang berarti aspal berpori adalah jenis campuran aspal yang lebih baik untuk dicampur dengan sampah plastik. Meskipun aspal berpori memiliki nilai marshall yang rendah, namun aspal jenis ini memiliki keunggulan pada permeabilitasnya. Dalam penelitian ini limbah plastik yang digunakan adalah jenis LDPE (low density polyethylene), yang mana terbukti memberikan peningkatan terhadap nilai stabilitas marshall. Penelitian ini mengubah aspal berpori dengan menambahkan plastik LDPE agar dapat digunakan di lapangan, kemudian dilakukan pengujian stabilitas marshall dan permeabilitas, Hasil penelitian ini diharapkan akan menghasilkan campuran aspal berpori dengan persentase kadar plastik tertinggi tanpa mengurangi klasifikasi permeabilitasnya dengan memperhitungkan persentase plastik yang digunakan. Hal yang tidak kalah penting, dibutuhkan data tambahan tentang ketahanan deformasinya melalui pengujian whell tracking machine. Dari hasil pengujian yang dilakukan, Dengan persentase penambahan plastik pada 0, 5, 10, 15, dan 20 berturut-turut, permeabilitas aspal berpori mencapai 0,2002 cm/s, 0,1640 cm/s, 0,1507 cm/s, dan 0,1131 cm/s, dan 0,0897 cm/s. Hasil dari pemeriksaan stabilitas Marshall pada aspal berpori dengan besaran persentase penambahan plastik mulai dari 0, 5, 10, 15, dan 20 persen menunjukkan nilai 571,52 kilogram, 716,9067 kilogram, 731,9467 kilogram, 817,1733 kilogram, dan 912,4267 kilogram. Untuk nilai stabilitas dinamis pada pengujian whell tracking machine memberikan hasil yang baik pada persentase plastik 20% yaitu sebesar 7159,091 lintasan/mm.
Stress and Strain on Self-Compacting Concrete using ALWA as Coarse Aggregates Substitution Darayani, Dhiafah Hera; Aryani, Fedya Diajeng
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.4524

Abstract

Concrete with lightweight aggregates is a type of concrete that is widely used in earthquake-prone areas. One of the building blocks for lightweight concrete utilizing waste is Styrofoam. Styrofoam in lightweight concrete began to be widely used in structural buildings. Self-compacting concrete is a type of concrete that can flow by itself without experiencing segregation. Light aggregate concrete is applied to self-compacting concrete in order to get benefits from an economic and construction time perspective, thereby saving costs and processing time. This study aimed to determine the ductility level of concrete seen from the magnitude of the stress and strain values at each ALWA content as a substitute for gravel in regular and self-compacting concrete. The loading of a concrete cylinder affects the relationship between stress and strain. Variations in the composition of ALWA substituted in concrete, from 0%, 15%, 50%, to 100%. The test was carried out as compressive strength with a cylindrical specimen with a height dimension of 200 mm and a diameter of 100 mm. The results of the test show that the strain values of 0.5f'c at SCC0, SCC15, SCC50, and SCC100 are 0.00140, 0.00140, 0.00146, 0.00151, the higher the ALWA substituted in the SCC mixture, the greater the strain value. In addition, the higher the amount of substituted ALWA in the SCC mixture, the lower the level of workability. This study shows that lightweight aggregate with Styrofoam can make concrete more ductile.ABSTRAKBeton dengan agregat ringan merupakan salah satu jenis beton yang banyak digunakan pada daerah rawan gempa. Bahan penyusun beton ringan dengan memanfaatkan limbah salah satunya berbahan Styrofoam. Penggunaan styrofoam pada beton ringan mulai banyak digunakan pada bangunan yang bersifat struktur. Beton memadat sendiri adalah jenis beton yang memiliki kemampuan untuk mengalir dengan sendirinya tanpa mengalami segregasi. Beton beragregat ringan diaplikasikan pada beton memadat sendiri agar mendapatkan manfaat dari segi ekonomi dan waktu pelaksanaan konstruksi, sehingga lebih menghemat biaya dan waktu pengerjaan. Tujuan penelitian ini untuk mengetahui tingkat daktilitas beton dilihat dari besarnya nilai tegangan dan regangan pada setiap kadar ALWA sebagai pengganti kerikil pada beton normal dan beton memadat sendiri. Pembebanan suatu silinder beton mempengaruhi hubungan antara tegangan dan regangan. Variasi komposisi ALWA yang disubstitusi pada beton yaitu dari 0%, 15%, 50% sampai 100%. Pengujian yang dilakukan berupa kuat tekan dengan benda uji berbentuk silinder dimensi tinggi 200 mm dan diameter 100 mm. Hasil dari pengujian menunjukkan nilai regangan 0.5f’c pada SCC0, SCC15, SCC50, SCC100 nilainya yaitu 0.00140, 0.00140, 0.00146, 0.00151, semakin tinggi ALWA yang disubstitusi dalam campuran SCC maka semakin besar nilai regangannya. Selain itu, semakin tinggi jumlah ALWA yang disubstitusi dalam campuran SCC maka semakin rendah tingkat workability. Penelitian ini menunjukkan penggunaan agregat ringan dengan styrofoam dapat menjadikan beton lebih daktail daripada sebelumnya.
Utilization of Vermicompost and Earthworms (Lumbricus Rubellus) for Bioremediation of Petroleum Polluted Soils Darmayanti, Lita; Putri, Nofia Afifah; Muhardi, Muhardi
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.3723

Abstract

As one of the petroleum-producing countries, Indonesia is vulnerable to pollution and environmental damage due to petroleum mining activities. Petroleum contains harmful hydrocarbon compounds and can harm the ecosystem of surrounding living things. The hydrocarbon compounds in petroleum are so numerous that to determine petroleum pollution in the soil, the Total Petroleum Hydrocarbon (TPH) parameter is used to represent these hydrocarbon compounds. One of the efforts to overcome the problem of soil pollution by petroleum can be done using biological methods known as bioremediation. Bioremediation is one of the essential alternative technologies because this effort is considered more economical and safe for the environment, although it takes longer. In this study, the technology applied was bioremediation using the vermicomposting technique. This study examined the bioremediation process using the vermicomposting technique by adding vermicompost and earthworms (Lumbricus rubellus) to overcome soil pollution due to petroleum waste. Based on the study's results, the composition of the mixture of oil-contaminated soil with vermicompost in a ratio of 1:2 (w/w) coupled with 25 worms can reduce the TPH level by 89.63%. The addition of vermicompost leads to an increase in soil porosity so that oxygen transfer for the survival of earthworms and the activity of degrading microbes during the bioremediation process is better than before.ABSTRAKIndonesia sebagai salah satu negara penghasil minyak bumi rentan terhadap risiko pencemaran dan kerusakan lingkungan akibat aktivitas pertambangan minyak bumi. Minyak bumi mengandung senyawa hidrokarbon berbahaya, serta dapat merugikan ekosistem makhluk hidup sekitarnya. Senyawa hidrokarbon dalam minyak bumi sangat banyak sehingga untuk menentukan pencemaran minyak bumi pada tanah digunakan parameter Total Petroleum Hydrocarbon (TPH) untuk mewakili senyawa-senyawa hidrokarbon tersebut. Salah satu upaya penanggulangan masalah pencemaran tanah oleh minyak bumi tersebut dapat dilakukan menggunakan cara biologi yang dikenal dengan isitilah bioremediasi. Bioremediasi merupakan salah satu teknologi alternatif penting karena upaya ini dianggap lebih ekonomis dan aman bagi lingkungan, walaupun membutuhkan waktu yang lebih lama. Dalam penelitian ini, teknologi yang diterapkan adalah bioremediasi menggunakan teknik vermicomposting. Penelitian ini dilakukan untuk mengkaji proses bioremediasi dengan menggunakan teknik vermicoposting dengan menambahkan vermikompos dan cacing tanah (Lumbricus rubellus) sebagai upaya penanggulangan pencemaran tanah akibat limbah minyak bumi. Berdasarkan hasil penelitian, komposisi campuran tanah terkontaminasi minyak dengan vermikompos dengan perbandingan 1:2 (b/b) yang ditambah dengan 25 ekor cacing bisa menurunkan kadar TPH sebesar 89.63%. Penambahan vermikompos menyebabkan peningkatan porositas tanah sehingga transfer oksigen untuk kelangsungan hidup cacing tanah dan aktivitas mikroba pendegradasi selama proses bioremediasi menjadi lebih baik
Hydrolysis Kinetics of Bacterial Cellulose Using Sodium Hydroxide Panjaitan, Jabosar Ronggur Hamonangan; Padang, David Andrian; Fatchurohman, Aziz; Ramadhan, Fourka Fitra
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.4433

Abstract

The hydrolysis reaction is a rupture reaction of reactants with water which is generally used to produce useful derivative products and can be reviewed for kinetics as a basis for reactor design. Nata or bacterial cellulose is a compound consisting of pure cellulose and water so that it can be hydrolyzed to produce various cellulose degradation products. This research examined the kinetic hydrolysis of bacterial cellulose using a sodium hydroxide catalyst. This study aimed to determine the kinetic parameters of the nata hydrolysis reaction using a base sodium hydroxide catalyst. The results showed higher temperatures and longer hydrolysis time performed better in hydrolysis reactions. The hydrolysis kinetics in this study were divided into two types, Type 1 hydrolysis kinetics which used the wet weight of bacterial cellulose, and Type 2, which used the dry weight of bacterial cellulose. From the calculation results, the order of bacterial cellulose hydrolysis reaction ranges from 5 – 6, with the kinetic constants of Type 1 hydrolysis kinetics at 40oC, 60oC, and 80oC were 0.000012, 40,255.4, and 299,839 min-1. In comparison, the reaction constants of Type 2 hydrolysis kinetics at 40oC, 60oC, and 80oC were 0.516851, 1.124119, and 2.408972 min-1. The activation energy of Type 1 hydrolysis kinetics was 558.3932 kJ/mol, and Type 2 hydrolysis kinetics was 35.31205 kJ/mol. The difference in kinetic parameter values for Types 1 and 2 will be a reference in designing a nata hydrolysis reactor from wet and dry nata reactants to produce various cellulose degradation compounds.ABSTRAKReaksi hidrolisis merupakan reaksi pemecahan reaktan dengan air yang umumnya dilakukan untuk memproduksi produk – produk turunan bermanfaat dan dapat ditinjau kinetikanya sebagai dasar dalam perancangan reaktor. Nata atau selulosa bakteri merupakan senyawa yang terdiri dari selulosa murni dan air sehingga dapat dihidrolisis untuk menghasilkan berbagai senyawa degradasi selulosa. Pada penelitian ini diteliti kinetika hidrolisis selulosa bakteri menggunakan katalis natrium hidroksida. Tujuan dari penelitian ini adalah untuk menentukan parameter kinetika reaksi hidrolisis nata menggunakan katalis basa natrium hidroksida. Hasil penelitian menunjukkan bahwa semakin tinggi suhu dan lama waktu hidrolisis akan meningkatkan kinerja reaksi hidrolisis. Kinetika hidrolisis pada penelitian ini terbagi dua tipe yaitu kinetika hidrolisis Tipe 1 yang menggunakan berat basah selulosa bakteri dan dan Tipe 2 yang menggunakan berat kering selulosa bakteri. Dari hasil perhitungan diperoleh orde reaksi hidrolisis selulosa bakteri berkisar antar 5 – 6 dengan konstanta reaksi kinetika hidrolisis Tipe 1 pada suhu 40oC, 60oC dan 80oC berturut – turut adalah 0,000012; 40.255,4; dan 299.839 min-1. Sedangkan konstanta reaksi kinetika hidrolisis Tipe 2 pada suhu 40oC, 60oC dan 80oC berturut – turut adalah 0,516851; 1,124119; dan 2,408972 min-1. Energi aktivasi kinetika hidrolisis Tipe 1 sebesar 558,3932 kJ/mol, dan energi aktivasi kinetika hidrolsis Tipe 2 sebesar 35,31205 kJ/mol. Perbedaan nilai parameter kinetika pada Tipe 1 dan 2 akan menjadi acuan dalam perancangan reaktor hidrolisis nata berbahan baku nata basah dan kering untuk memproduksi berbagai senyawa degradasi selulosa.
Potential Analysis of the Sumberringin River for a Micro Hydro Power Plant in Tumpang District, Malang Regency Hanggara, Ikrar; Arystianto, Deni Putra; Susilo, Helik
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.3890

Abstract

The Sumberringin River is included in the upstream section so that the shape of the land surface around the river is still a hilly area, so it has a narrow river dimension with a reasonably high flow velocity. This condition is interesting for conducting studies related to the potential of the river supported by the existence of the Wringinsongo area, which relies on flowing water sources as tourism. This study aims to determine : 1) the potential of the Sumberringin River in the form of river water discharge, 2) the elevation of the land surface to obtain a high potential for falling for the potential energy utilization of river water, 3) the shape of the land surface (land-surface) for modeling river utilization construction, 4) The potential amount of electrical power that can be generated theoretically using a micro-hydro power plant (PLTMH). This study used a survey method of measurement/observation of two biological parameters (water flow discharge and ground elevation/falling height of river water flow) to simulate potential water flows and model the construction of the PLTMH building. River discharge measurements are carried out at four points in the location as a reference for calculations. The first point is ninety liters per second; the second is one hundred and forty liters per second; the third is thirty liters per second; and the fourth is eight twenty liters per second, so the average measured flow rate is eighty liters per second. The results of contour modeling show that the height of the fall is 3-3 meters high, the width of the planned weir is five and a half meters, with a weir height of one and a half meters, it is planned to be able to generate electricity in a turbine of eleven kilowatts using a crossflow type turbine. This research can be a comparison method for other similar areas in calculating river potential.ABSTRAKSungai Sumberringin termasuk pada bagian hulu sehingga bentuk permukaan tanah sekitar sungai masih merupakan daerah perbukitan, sehingga memiliki dimensi sungai yang tidak lebar dengan kecepatan aliran yang cukup tinggi. kondisi tersebut menarik untuk dilakukan kajian terkait potensi sungai ditunjang dengan keberadaan daerah wringinsongo yang mengandalkan aliran sumber air sebagai wisatanya. Penelitian ini bertujuan untuk mengetahui: 1) potensi sungai sumberringin berupa debit air sungai, 2) elevasi muka tanah untuk mendapatkan potensi tinggi jatuh untuk pemanfaatan energi potensial air sungai, 3) bentuk muka tanah (land-surface) untuk pembuatan model konstruksi pemanfaatan sungai, 4) potensi besaran daya listrik yang dapat dihasilkan secara teoritis menggunakan pembangkit listrik tenaga mikro-hidro (PLTMH). Penelitian ini menggunakan metode survei pengukuran / observasi terhadap dua parameter alam (debit aliran air dan elevasi muka tanah / ketinggian jatuh aliran air sungai) untuk kemudian dilakukan simulasi potensi aliran air dan pemodelan konstruksi bangunan PLTMH. Pengukuran debit sungai dilaksanakan pada empat titik di lokasi sebagai acuan perhitungan, titik pertama sebesar sembilan puluh liter per-detik, titik kedua sebesar seratus empat puluh liter per-detik, titik ketiga sebesar tiga puluh liter per-detik, titik ke-empat sebesar delapan puluh liter per-detik sehingga rerata debit aliran yang terukur sebesar delapan puluh liter per detik. Hasil pemodelan kontur didapatkan besarnya tinggi jatuh yang didapatkan setinggi 3 tiga meter, lebar bendung rencana sebesar lima setengah meter, dengan tinggi bendung sebesar satu setengah meter, direncanakan mampu untuk membangkitkan listrik pada turbin sebesar sebelas kilowatt menggunakan turbin tipe crossflow. Hasil penelitian ini dapat menjadi salah satu metode pembanding daerah lain yang sejenis dalam menghitung potensi sungai.
Congestion Charge Analysis for Private Vehicle Users in the Central Business District (Case Study: Jalan Pemuda-Pandanaran-Ahmad Yani, Semarang City) Utami, Adita; Qumara, Nadhiyah Ayu; Nurhidayat, Asep Yayat
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.4188

Abstract

Semarang, part of the Kedungsepur area, has a population of 1,656,564 with an average annual growth of 1.57%. The increase in population can increase the intensity of trips, so good transportation infrastructure is needed. The presence of the Central Business District (CBD) area in Semarang, precisely on Jalan Pemuda-Pandanaran-Ahmad Yani, often results in congestion. The purpose of this research was to provide recommendations for solutions in the form of a study on applying congestion charges to private vehicles to overcome congestion on the road. This research uses traffic analysis to determine the performance of existing roads using the PKJI 2014 method. After knowing the traffic performance, modeling the mode selection of private cars for BRT Trans Semarang was carried out using the logit binomial difference method. In this study, three travel attributes were considered influential in the choice of mode: travel time, congestion costs, and frequency. The private car utility equation for BRT Trans Semarang is obtained with a value of U=-11.3774-0.2639(X1)-0.0120(X2)-1.5403(X3). Based on the research results, a congestion charge of IDR 10,000 was obtained, with the percentage of private car users switching to BRT Trans Semarang at 79.8%. So implementing a congestion charge is considered adequate to reduce the congestion on the road.ABSTRAKKota Semarang merupakan bagian dari kawasan Kedungsepur memiliki 1.656.564 jiwa penduduk dengan pertumbuhan rata-rata tiap tahun sebesar 1,57%. Peningkatan jumlah penduduk tersebut berpotensi meningkatkan intensitas perjalanan, sehingga dibutuhkan sarana prasarana transportasi yang baik. Adanya Central Business District (CBD) kawasan di kota Semarang tepatnya di Jalan Pemuda-Pandanaran-Ahmad Yani sering mengakibatkan kemacetan. Sehingga tujuan penelitian ini dilakukan untuk memberikan rekomendasi solusi berupa kajian penerapan congestion charge terhadap kendaraan mobil pribadi, untuk mengatasi kemacetan lalu lintas di Jalan tersebut. Diawali dengan melakukan analisis lalu lintas untuk mengetahui kinerja ruas jalan eksisting dengan metode PKJI 2014. Selanjutnya setelah diketahui kinerja lalu lintasnya, dilakukan pemodelan pemilihan moda mobil pribadi terhadap BRT Trans Semarang dengan metode logit binomial selisih.  Penelitian ini menggunakan 3 atribut perjalanan yang dinilai berpengaruh dalam pemilihan moda yaitu waktu tempuh, biaya kemacetan, dan frekuensi. Didapatkan persamaan utilitas mobil pribadi terhadap BRT Trans Semarang dengan nilai U = - 11.3774 - 0.2639 (X1) - 0.0120 (X2) - 1.5403 (X3). Nilai congestion charge diperoleh Rp.10.000 dengan persentase pengguna mobil pribadi yang akan berpindah menggunakan BRT Trans Semarang sebesar 79,8%. Sehingga adanya skenario penerapan congestion charge dinilai cukup efektif untuk menurunkan tingkat kemacetan dijalan tersebut.
Safety Evaluation of Rockfill Dam Based on Seepage Discharge Data Sulistya, Krisna; Sachro, Sri Sangkawati; Sukamta, Sukamta
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.3730

Abstract

The leading cause of failure of an embankment dam is the occurrence of excessive seepage, which triggers piping that can disrupt the stability and safety of the dam. This study discusses the dam's safety against the danger of seepage with a case study of the Jatibarang Dam. The safety evaluation uses V-notch monitoring data during the operational period from 2018 to 2021. The highest seepage discharge recorded during that period was 2,232 lt/sec/m, where the unsafe threshold for seepage based on the dam's height was 0,56 lt/sec/m, so seepage is unsafe. Meanwhile, based on the seepage discharge index (QI) calculation, the QI value is less than one, so the seepage discharge is still safe. Evaluating dam safety against excessive seepage discharge for dams of the same type as the Jatibarang Dam is more appropriate to use the seepage discharge index (QI) threshold because the parameters in the equation are complete.ABSTRAKPenyebab utama kegagalan suatu bendungan tipe urugan adalah terjadinya rembesan berlebih yang memicu piping yang dapat mengganggu kestabilan dan keamanan bendungan. Penelitian ini membahas keamanan bendungan terhadap bahaya rembesan dengan studi kasus Bendungan Jatibarang.  Evaluasi keamanan menggunakan data pemantauan V-notch selama masa operasional tahun 2018 sampai dengan 2021. Debit rembesan tertinggi yang tercatat pada kurun waktu tersebut sebesar 2,232 lt/dt/m, dimana ambang batas tidak aman terhadap rembesan berdasarkan ketinggian bendungan adalah 0,56 lt/dt/m sehingga rembesan dalam kondisi tidak aman. Sedangkan berdasarkan perhitungan indeks debit rembesan (QI) menghasilkan nilai QI kurang dari satu sehingga debit rembesan masih dalam kondisi aman. Evaluasi keamanan bendungan terhadap debit rembesan berlebih terhadap bendungan yang se-tipe Bendungan Jatibarang lebih tepat menggunakan ambang batas indeks debit rembesan (QI) karena parameter pada persamaannya lebih lengkap.
Experimental Study on the Failure of Bamboo Laminated Hollow Section Beam-Column Joints using Glue-in-Rod Bracket Arifin, Achmad Saiful; Karyadi, Karyadi; Nindyawati, Nindyawati
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 2 (2023): EDISI SEPTEMBER 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i2.4638

Abstract

Building materials that emit pollutants, are non-renewable, and generate environmental waste require attention. Wood, a popular and natural material, is facing increasing scarcity, necessitating a substitute. Laminated bamboo emerges as the most akin and natural alternative to wood. Research into laminated bamboo encompasses diverse cross-sections, joint types, and field applications, demanding further investigation.This study aimed to ascertain failure types and damage patterns in laminated bamboo hollow section beam-column joints modified with glue-in rod-bracket connections, using petung bamboo (dendrocalamus asper). The research employed an experimental approach with descriptive analysis. Joint failures were evaluated based on moment-rotation relationships within prescribed rotational limits per standards, while joint damage was assessed through visual inspection of joint components.The study's dependent variables included thread rod diameters of 6 mm, 8 mm, dan 10 mm, and 4 dan 6 embedded thread rods, while the independent variables were failure types and joint collapses. Results revealed serviceability failures in samples 8.6, 10.4, and 10.6. Joint damage across all test specimens primarily manifested as broken thread rods. The highest joint strength observed was 6.28 kNm in sample 10.6, with the lowest at 2.25 kNm in sample 6.4.Based on the findings, increasing thread rod diameters to achieve ductile joints resulted in longer rotations but did not meet the planned strength due to bracket-induced prying effects causing bolt head failure. Despite this, the collapse type aligned with the research plan. Addressing the bracket's fulcrum effect during field applications requires solutions, potentially involving enlarging the bracket's base and increasing the number of thread rod points. The tests did not damage the laminated bamboo components, emphasizing the need to consider laminated bamboo cross-sectional dimensions and thread rod fulcrum effects in subsequent tests to ensure uniform component performance. 
Production of HCl Activated Carbon From Rice Husk Waste Alwardah, Chairunnisa; Kusuma, Daffa Meifan; Bagastama, Bima; Yuda, Dimas; Wahyuningtyas, Aulia; Aeni, Alfieta Rohmaful
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 2 (2024): EDISI SEPTEMBER 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i2.6102

Abstract

Rice husks are agricultural waste whose utilization is not optimal because the waste is usually only burned. Agricultural waste that is burned will harm the environment. Chemical contents such as cellulose and lignin in rice husks can be used to make active carbon. This research aims to determine the optimum operating conditions for producing carbon, obtain information regarding functional groups and changes in pore surface area on carbon before and after activation, and determine the effect of chemical activator HCl on the carbon produced. Rice husks were carbonized using a furnace at temperatures of 200°C, 250°C, and 300°C for 30, 60, and 120 minutes, followed by chemical activation using HCl for 12, 24, and 36 hours. The research results showed that the carbonization variation of 300°C at 120 minutes was closest to SNI standards: water content of 3.91%, ash content of 14.63%, volatile content of 20.01%, and fixed carbon content of 65.36%. Activation of HCl causes the appearance of carboxylic acids. Chemical activation of HCl for 12 hours resulted in proximate content that was close to the SNI 06-3730-1995 standard and resulted in the husk carbon having a larger pore surface area, namely 141,369 m2/g, compared with the pore surface area of the husk carbon before activation was 118,083 m2/g.
Effect of Salt Solution in Electrochemical Stabilization with Variation of Potential Difference on Clay's Shear Strength Darmiyanti, Lydia; Wiharja, Ujang
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 9, No 1 (2024): EDISI MARET 2024
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v9i1.5434

Abstract

Clay is one of the problematic soils in Indonesia, with a distribution in Java of close to 20% of surface pedology. The biggest problem with clay soil is its ability to swell when it absorbs water and shrink when the water content decreases. Indonesia's tropical climate, where only the rainy and dry seasons, significantly affects clay's swelling potential, hindering the soil's mechanical properties. The significant expansion potential causes the soil to have a slight shear angle, which affects its bearing capacity. This condition underlies the urgency of clay soil improvement to increase the shear strength of the soil. Electrochemical stabilization is one of the effective methods for soils with low permeability. This study aimed to determine the most optimum voltage in electrochemical stabilization using a salt solution. The electrochemical process is used in soil stabilization. This method is used to improve soils with low permeability and high plasticity index (18%), which results in increased bearing capacity and decreased soil development. This study was conducted with four different stress scenarios, and from the results of testing the mechanical properties of the soil, it was found that the greatest shear strength occurred at a stress of 12V. Stabilization of clay soil by electrochemistry can be inferred from the research to increase the value of soil shear strength and affect the increase in soil bearing capacity.

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