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INDONESIA
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 Comparison of Flexural Performance of Reinforced Concrete Beam With Lap Splice and Threaded Coupler-Type Mechanical Splices Zaneta Ambarwati; Jafar Jafar
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4192

Abstract

In the construction world, there are several ways to connect reinforcement: lap splice, welding, and mechanical. This study compares the flexural performance of reinforced concrete beams where the reinforcement is connected by lap splice and mechanical threaded coupler type. The size of the reinforced concrete beam used as the test object is 200×300×2000 mm, with an f'c value of 25 MPa. Three test specimen beams were prepared in this study: beams without reinforcement joints beams with lap joints, and beams with mechanical joints. From the laboratory tests, the nominal moment values (Mn) for reinforced concrete beams with lap joints and mechanical coupler-type connections were 42.231 MPa and 29.436 MPa, respectively. The maximum load is on the beam with lap joints of 138.85 kN. From the nominal moment value and maximum load obtained, it can be seen that the beam with lap joints can bear the most significant load. Regarding ductility, beams with coupler connections tend to be more brittle (non-ductile) when compared to beams with lap joints. Therefore, although the coupler-type mechanical connection has benefits, it has yet to be able to replace the lap joints in reinforced concrete beams in terms of strength and ductility. Mechanical connection failure occurred in the reinforcement section, which was turned to connect with the coupler.ABSTRAKDalam dunia konstruksi terdapat beberapa cara untuk menyambung tulangan yakni dengan cara penyaluran lewatan (Lap Splice), pengelasan (welded), dan mekanis. Penelitian ini membandingkan kinerja lentur balok beton bertulang dimana tulangannya disambung dengan cara penyaluran lewatan (Lap Splice) dan mekanis tipe threaded coupler. Ukuran balok beton bertulang yang digunakan sebagai benda uji adalah 200×300×2000 mm dengan nilai f’c 25 MPa. Tiga balok benda uji disiapkan dalam penelitian ini yakni, balok tanpa sambungan tulangan, balok dengan sambungan lewatan, dan balok dengan sambungan mekanis. Dari pengujian laboratorium yang dilakukan didapatkan nilai momen nominal (Mn) untuk balok beton bertulang dengan sambungan lewatan dan sambungan mekanis tipe coupler berturut-turut sebesar 42,231 MPa, dan 29,436 MPa. Beban maksimum terdapat pada balok dengan sambungan lewatan yakni sebesar 138,85 kN. Dari nilai momen nominal dan beban maksimum yang diperoleh dapat dilihat bahwa balok dengan sambungan lewatan dapat menanggung beban terbesar. Dari segi daktilitas, balok dengan sambungan coupler cenderung lebih getas (tidak daktail) jika dibandingkan dengan balok dengan sambungan lewatan. Oleh karena itu, meskipun sambungan mekanis tipe coupler memiliki benefit, namun belum mampu menggantikan sambungan lewatan pada balok beton bertulang dari segi kekuatan dan daktilitas. Kegagalan sambungan mekanis terjadi pada bagian tulangan yang dibubut untuk keperluan penyambungan dengan coupler. 
Evaluation Study of Green Open Space in Pulogadung Industrial Area Based on Ministry of Industry Standards Towards Green-Blue Open Space Monalisa Monalisa; Agus Suroso; Sutrisno Sutrisno
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4431

Abstract

One of the harmful effects of limited green space is high air pollution. As many as 7.78% of residents who live in East Jakarta suffer from ISPA. This problem can be overcome by building green open spaces around settlements. This study aims to analyze and evaluate green open spaces located in the Pulogadung Industrial according to the Minister of Industry's regulation towards the green-blue open space concept. The method used in this research is descriptive quantitative. The results of this study are that the Pulogadung industrial area has land that functions as a green open space of 30.49 hectares, or around 6% of the entire area. Based on the Minister of Industry regulation, a minimum green open space is 10% of the total area. It proves that green open space in the Pulogadung industrial area must meet the assessment criteria. The Pulogadung industrial area has green-blue open space. However, it does not fulfill the green-blue open space concept according to the ATR/BPN ministerial regulations in terms of fulfilling socio-cultural and aesthetic functions because it does not provide recreational facilities, and tree planting does not show a symmetrical pattern. ABSTRAKSalah satu dampak buruk dari RTH yang terbatas adalah polusi udara yang tinggi. Sebanyak 7,78% warga yang bertempat tinggal di Jakarta Timur menderita penyakit ISPA. Masalah tersebut dapat diatasi dengan cara membangun ruang terbuka hijau di sekitar permukiman. Tujuan penelitian ini adalah menganalisa dan mengevaluasi ruang terbuka hijau yang berlokasi di Kawasan Industri Pulogadung berdasarkan peraturan menteri perindustrian menuju konsep green-blue open space. Metode yang digunakan dalam penelitian ini adalah deskriptif kuantitatif. Hasil pembahasannya adalah Kawasan industri pulogadung memiliki lahan yang difungsikan sebagai ruang terbuka hijau sebesar 30,49 Ha atau sekitar 6% dari total luas areal. Berdasarkan peraturan menteri perindustrian, minimal luas RTH yaitu 10% dari keseluruhan luas kawasan. Hal ini menunjukkan bahwa RTH yang berlokasi di kawasan industri pulogadung belum memenuhi kriteria penilaian. Kawasan industri pulogadung memiliki ruang terbuka hijau-biru namun belum memenuhi konsep green-blue open space sesuai peraturan menteri ATR/BPN dalam hal pemenuhan fungsi sosial budaya dan fungsi estetika karena tidak menyediakan fasilitas rekreasi dan penanaman pohon tidak menunjukkan pola simetris.
Utilization of Activated Carbon Derived from Dragon Fruit Foliage Using Strong Acid Activator as a Lead (Pb) Metal Adsorbent Chrisnandari, Rosita Dwi; Witasari, Wianthi Septia; Mustikarini, Anugrah Windy
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.3856

Abstract

The majority of industrial liquid waste contains heavy metal lead (Pb). Lead (Pb) levels can be lowered by employing activated carbon as an adsorbent. Lignin and cellulose found in dragon fruit stem can be employed as activated carbon for heavy metal adsorption. This research aimed to examine the addition of HCl and H3PO4 as activators to the properties of carbon and determine variations in activator concentration that affected the reduction of lead (Pb) levels. The carbonization method was applied to produce carbon. The batch method was implemented to adsorb lead (Pb) on the sample. The utilized concentrations of HCl and H3PO4 to activate carbon were 2, 3, and 4 M. The best water content of activated carbon was obtained by adding 3 M HCl, which accounted for 4.76%. The best iodine absorption, measured for 990,05 mg/g, was procured on HCl 2 M activated carbon. Atomic Absorption Spectrophotometry (AAS) was applied to quantify the lead reduction (Pb) levels, with the best reduction efficiency accounting for 55.6% produced by carbon activated 2M HCl. Furthermore, H3PO4-activated and unactivated carbon only reduced by about 22.2% and 44.4%, respectively. Scanning Electron Microscope (SEM) results revealed that carbon activated with 2 M HCl had a larger cavity than that activated by H3PO4 and without activation. According to the results obtained in this study, dragon fruit stem can be utilized as a low-cost and effective metal (Pb) adsorbent.ABSTRAKLimbah cair dari aktivitas industri sebagian besar mengandung logam berat timbal (Pb). Logam (Pb) dapat diturunkan kadarnya menggunakan karbon aktif. Karbon aktif dapat dibuat dari bahan yang mengandung lignin dan selulosa, salah satunya batang daun buah naga. Tujuan penelitian ini yaitu untuk menentukan pengaruh penambahan aktivator HCl dan H3PO4 terhadap karakteristik karbon aktif serta pengaruh variasi konsentrasi aktivator terhadap penurunan kadar logam (Pb). Metode karbonisasi digunakan untuk pembuatan karbon aktif, sedangkan metode batch digunakan untuk proses adsorpsi logam (Pb). Aktivator HCl dan H3PO4 yang digunakan sebesar 2, 3 dan 4 M. Kadar air terbaik sebesar 4,76% diperoleh pada karbon yang teraktivasi HCl 3 M. Daya serap iod terbaik sebesar 990,05 mg/g diperoleh pada karbon teraktivasi HCl 2 M. Kadar logam (Pb) dianalisis menggunakan Atomic Absorption Spectrophotometry (AAS) dengan efisiensi penurunan terbaik sebesar 55,6% pada karbon aktif teraktivasi HCl 2 M. Efisiensi penurunan kadar logam (Pb) pada karbon teraktivasi H3PO4 dan tanpa aktivasi berturut-turut sebesar 22,2% dan 44,4%. Hasil Scanning Electron Microscope (SEM) menunjukkan bahwa karbon yang teraktivasi HCl 2 M memiliki rongga yang lebih besar dibandingkan dengan yang teraktivasi H3PO4 dan tanpa aktivasi. Hasil dari penelitian ini menunjukkan bahwa daun buah naga berpotensi digunakan sebagai adsorben logam (Pb) yang murah dan cukup efisien.
Redesign of Laboratory Facilities Layout Quality Control at PT. Industri Kimia Putri Dwi Octaviani; Yanty Maryanty
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4518

Abstract

PT. The chemical industry is a company that has been producing hydrogen peroxide since 1992. One of the essential roles of this chemical factory is the Quality Control Laboratory, which functions to analyze raw materials and hydrogen peroxide products before distributing them to consumers to ensure product quality. Based on the standard of laboratory quality management system, SNI ISO/IEC 17025:2008 states that in order to facilitate the correctness of test performance, the laboratory must monitor, control and record the temperature and humidity in the testing room because it will have an impact on the validity of the quality of the data produced—however, Procurement of test equipment facilities in the QC laboratory of PT. The chemical industry is not supported by good facility layout planning, so it is necessary to rearrange the layout, including the function of equipment and materials and the conditioning of utility and electricity systems. The laboratory layout redesign parameters used are floor area measurement, ARC (Activity Relationship Chart) analysis, and ARD (Activity Relationship Diagram) analysis. The study results are in the form of calculating the total closeness rating value on the activity proximity relationship diagram, the largest value is the sample space of 6200, and the lowest value is the computer room of 200. From these calculations, a layout template for testing laboratory facilities is created based on the order of the highest total closeness rating value to the smallest value so that a laboratory layout will be obtained according to the SNI ISO/IEC 17025:2008 standard and can create an effective and efficient work environment.
Utilization of Palm Fiber and Sikacim Concrete Additive as Additional Materials in Concrete Mixtures Viewed From the Strength of Pulling Zulkarnain, Fahrizal; Lubis, Delva Enzelya Adila
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.v8i1.3371

Abstract

Concrete is an important material used in regional construction. The purpose of this study was to utilize palm fiber as an additive to increase the split tensile strength of concrete. In addition, the sicacim concrete additive is used as a chemical additive in concrete mixtures to produce higher-quality concrete. This study used sicacim concrete additives (0.08% cement) and palm fiber (4%, 5%, and 6% by weight) as cement substitutes. The components of the test object used in this study were vessels with a size of 15 x 30 cm, aged 28 years, and rut values of 60-180 cm—alloy configuration using SNI 03-2834-2000 technique. There are a total of 12 specimens, three for each variation. The finished test is a substantial elasticity test. Based on the research results, the split tensile strength of standard concrete is 3.52 MPa; the split tensile strength of concrete with a mixture of 4% palm fiber and 0.8% sicacim concrete additive is 3.69 MPa; the splitting tensile strength of concrete using a mixture of 5% palm fiber and 0.8% sicacim concrete additive is 4.09 MPa; then the tensile strength of the concrete uses a mixture of 6% palm fiber and 0.8%.ABSTRAKBeton merupakan bahan penting yang digunakan dalam pembangunan daerah. Tujuan penelitian ini adalah memanfaatkan ijuk sebagai bahan tambahan untuk imeningkatkan ikuat itarik ibelah ibeton. iSelain iitu, aditif betonisicacim digunakanisebagaiibahanikimia itambahan idalam campuran betonidalam upaya menghasilkan ibeton iyang ilebih iberkualitas. Dalam penelitian iini, iaditif ibeton isicacim i(0,08% isemen) idan iijuk (4%, 5%, dan 6% berat) digunakan sebagai pengganti semen. Komponen benda uji yang dimanfaatkan pada penelitian ini adalah bejana dengan ukuran yaitu 15 x 30 cm dengan umur 28 tahun, dan nilai rut 60-180 cm. Konfigurasi paduan menggunakan teknik SNI 03-2834-2000. Total ada 12 spesimen, tiga untuk setiap variasi. Uji selesai adalah uji elastisitas substansial. Berdasarkan hasil penelitian, daya tarik belah pada beton normal adalah diangka 3,52 MPa kuat tarik belah beton dengan campuran 4% ijuk dan 0,8% aditif beton sicacim adalah 3,69 MPa; daya tarik belah beton menggunakan bahan campuran 5% ijuk dan 0,8% aditif beton sicacim adalah 4,09 MPa; kemudian daya tarik belah beton menggunakan campuran sebesar 6% ijuk dan 0,8%.
Mechanical Characterization of Sumbawa Local Sisal Fiber Polyester Composite Sandwich Panel compared to Meranti Wood Panels Fitrayudha, Adryan; Hidayati, Nurul; Zarkasi, Ahmad
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.v8i1.4493

Abstract

The development of composite material engineering is an effective solution for the development of green building-based materials that are being campaigned in various parts of the country today. The fundamental problem in composite engineering that is developing is the lack of use of environmentally friendly materials as the basic material for composite constituents. The use of natural fiber-based composite materials as reinforcement is one of the right solutions to answer the issue of green building in producing more environmentally friendly materials with much better mechanical resistance. The study aims to determine the flexural characteristics of sandwich panel beams of sengon (SPS) in comparison to Meranti beams. The material used as skin for SPS beams is a composite of sisal fiber polyester from Sumbawa Island. Test standard based on ASTM C393 (length 550 mm, width 50 mm, thickness 25 mm), with a total of 5 specimens each. The test results showed that the SPS beams had an average bending stress of 167.66 MPa, while the Meranti wood beams produced an average bending stress of 94.29 MPa. The amount of bending stress produced by SPS beams is 43.38% higher than meranti wood beams. The average deflection value of SPS beams is 20.34 mm, greater than the average deflection value of sengon wood of 15.42 mm. This shows that the use of sisal polyester composite skin on SPS beams can produce better mechanical characteristics compared to Meranti wood.ABSTRAKPerkembangan rekayasa material komposit merupakan solusi yang efektif bagi pengembangan material berbasis green building yang sedang dikampanyekan di berbagai belahan negara saat ini. Permasalahan mendasar dalam rekayasa komposit yang tengah berkembang adalah minimnya penggunaan material ramah lingkungan sebagai bahan dasar penyusun komposit. Penggunaan material komposit berbasis serat alam sebagai perkuatan (reinforcement) merupakan salah satu solusi yang tepat guna menjawab isu green building dalam menghasilkan material yang lebih ramah lingkungan dengan ketahanan mekanis yang jauh lebih baik pula. Penelitian ini bertujuan untuk mengetahui karakteristik lentur pada balok sandwich panel kayu sengon (SPS) dengan pembanding balok kayu meranti (kayu kelas II). Material yang digunakan sebagai skin pada balok SPS adalah komposit polyester serat sisal yang dibudidayakan di Pulau Sumbawa, Nusa Tenggara Barat. Standar pengujian berdasarkan ASTM C393 (panjang 550 mm, lebar 50 mm, tebal 25 mm), dengan jumlah masing-masing 5 benda uji. Hasil pengujian menunjukkan balok SPS memiliki tegangan lentur rata-rata sebesar 167,660 MPa, sedangkan pada balok kayu meranti menghasilkan tegangan lentur rata-rata sebesar 94,292 MPa. Besarnya tegangan lentur yang dihasilkan balok SPS lebih tinggi 43,380% dibandingkan balok kayu meranti (kayu kelas II). Nilai lendutan rata-rata pada balok SPS sebesar 20,340 mm, lebih besar dibandingkan nilai lendtan rata-rata kayu sengon sebesar 15,420 mm. Hal tersbut menunjukkan bahwa penggunaan skin komposit polyester sisal Sumbawa pada sandwich panel kayu sengon mampu menghasilkan karakteristik mekanik yang lebih baik dibandingkan dengan kayu Meranti.
Optimasi Produktivitas Alat Berat dengan Metode Simpleks LINGO (Heavy-Duty Productivity Optimization Using LINGO Simplex Method) Heru Setiyo Cahyono; Apif Miptahul Hajji; Aisyah Larasati; Imam Alfianto
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4439

Abstract

One of the areas that are now the location for clearing residential land is in Karang Widoro Village, which is now a plantation and fruit farm and has been purchased by the developer Podo Joyo Masyhur (PJM) Group who then runs the project "The OZ Tidar Housing, Malang" where the land being worked on has a total area of 47,000 m2. Construction work involving digging, hauling, and leveling equipment requires consideration so that the work can be carried out following the target volume of work and the specified time allocation. So it is necessary to carry out project control by considering aspects that affect excavation and backfill work by heavy equipment in the field. Several choices of methods in optimizing calculations and selecting tools to increase work productivity of heavy equipment are the Linear Simplex Method Program. Then combined with the use of currently widely developed software, this method is more effective in finding the best solution for a function with several variables from existing problems. LINGO can be a solution for optimizing work execution so that work targets can be completed on time with minimum operational costs and minimizing the number of units obtained. The results of the analysis of several factors that influence productivity are calculated using a linear program to achieve an optimum choice. The Simplex Method Lienar Program Optimization Model is: Minimization Z = 1836000 x1 + 483000 x2 + 712200 x3 (in IDR/day).ABSTRAKSalah satu area yang sekarang menjadi lokasi pembukaan lahan perumahan adalah di Desa Karang Widoro yang sekarang menjadi perkebunan dan pertanian buah serta telah dibeli oleh pengembang Podo Joyo Masyhur (PJM) Group yang kemudian menjalankan proyek “Perumahan The OZ Tidar, Malang” dimana lahan yang dikerjakan memiliki luas total 47.000 m2. Pada pekerjaan konstruksi yang mengikutsertakan alat gali-muat, angkut, dan perata tanah memerlukan pertimbangan agar pekerjaan dapat dilaksanakan sesuai dengan target volume pekerjaan dan alokasi waktu yang ditetapkan. Maka perlu dilakukan pengendalian proyek dengan mempertimbangkan aspek-aspek yang berpengaruh terhadap jalannya pekerjaan galian dan urukan oleh alat berat di lapangan. Beberapa pilihan metode dalam perhitungan optimasi dan pemilihan alat untuk peningkatan produktivitas kerja alat berat adalah Program Linear Metode Simpleks. Lalu digabungkan dengan penggunaan perangkat lunak yang saat ini banyak berkembang, metode ini lebih efektif dalam pencarian solusi terbaik suatu fungsi dengan beberapa variabel dari permasalahan yang ada. LINGO dapat menjadi solusi dalam optimasi pelaksanaan pekerjaan sehingga target pekerjaan dapat selesai tepat waktu dengan biaya operasional yang minimum serta meminimalkan jumlah unit yang didapatkan. Hasil analisis terhadap beberapa faktor yang berpengaruh pada produktivitas dan dihitung menggunakan program linear sehingga mampu dicapai pilihan yang optimum. Model Optimasi Program Lienar Metode Simpleks yang ditetapkan adalah : Minimasi Z =1836000 x1 + 483000 x2 + 712200 x3 (dalam Rp/hari)
Greywater Waste Treatment as a Solution to the Clean Water Crisis in Bontang City Lies Kurniawati Wulandari
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4383

Abstract

This research develops a technique for treating greywater and rainwater wastewater into clean water, namely by using a filtration technique using sand as a filter material, as well as adding PAC (Poly Aluminum Chloride) and soda ash (Sodium Chloride) to neutralize pH. Observations were made on variations in PAC and soda ash levels (X1) and variations in sand thickness (X2) on water quality parameters (Y) consisting of pH and turbidity (NTU). Data analysis was performed using the linear regression method. The treatment techniques applied are proven capable of converting greywater and rainwater waste into class II clean water. In other words, water can be used for daily needs but not for consumption. The filtration method can remove pollutants in greywater wastewater and be a solution for meeting clean water in urban areas, especially in Bontang City, East Kalimantan.ABSTRAKPenelitian ini mengembangkan sebuah teknik pengolahan air limbah greywater dan air hujan menjadi air bersih, yakni dengan teknik filtrasi menggunakan pasir sebagai material filter, serta penambahan PAC (Poly Alumunium Chloride) dan soda ash (Sodium Chloride) untuk menetralisir pH. Pengamatan dilakukan terhadap variabel variasi kadar PAC dan soda ash (X1) dan variasi ketebalan pasir (X2) terhadap parameter kualitas air (Y) yang terdiri dari pH dan kekeruhan (NTU). Analisis data dilakukan dengan menggunakan metode regresi linier. Secara umum, teknik pengolahan yang diterapkan terbukti mampu merubah limbah greywater dan air hujan menjadi air bersih kelas II. Dengan kata lain, air telah dapat digunakan untuk keperluan sehari-hari, namun tidak untuk dikonsumsi. Metode filtrasi mampu menghilangkan polutan yang terkandung dalam air limbah greywater, dan dapat menjadi solusi pemenuhan air bersih di kawasan perkotaan, khususnya Kota Bontang, Kalimantan Timur.
Evaluation of the level of service users for the Ketapang–Gilimanuk Ferry Service during the Covid-19 Pandemic Using the Customer Satisfaction Index and Importance Performance Analysis Utomo, Dyon Setio; Siswanto, Henri; Supriyanto, Bambang
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.3971

Abstract

The Indonesian government has established a policy of limiting community mobilization to prevent the spread of Covid-19. This policy decreased the number of public transport passengers, including a decrease in ferry passengers crossing Ketapang-Gilimanuk. The study assesses user satisfaction with the Ketapang-Gilimanuk ferry service during the Covid-19 pandemic. The analysis methods are the Importance Performance Analysis (IPA) and Customer Satisfaction Index (CSI). The results obtained a CSI value of 75.12%, indicating that ferry service users are generally 'satisfied' with the quality of service provided. The attributes that need to be evaluated and improved based on the IPA analysis are available life jackets, first aid kits, lifeboats, security officers, complaint number information, trash bins, toilets, and air circulation facilities.ABSTRAKPemerintah Indonesia telah menetapkan kebijakan pembatasan mobilisasi masyarakat untuk mencegah penyebaran Covid-19. Kebijakan ini berdampak pada penurunan jumlah penumpang transportasi umum, termasuk penurunan penumpang kapal feri penyebrangan Ketapang–Gilimanuk. Tujuan penelitian ini untuk menganalisis tingkat kepuasan penumpang terhadap pelayanan pada kapal penyeberangan rute Ketapang–Gilimanuk pada saat pandemi Covid-19. Analisis dalam penelitian ini menggunakan metode Importance Performance Analysis (IPA) dan metode Customer Satisfaction Index (CSI). Temuan yang diperoleh pada  penelitian adalah nilai CSI yaitu 75,12%, ini mempunyai makna bahwa  penumpang jasa kapal penyeberangan umumnya ‘puas’ terhadap pelayanan yang diberikan. Beberapa atribut perlu dievaluasi dan diperbaiki berdasarkan analisis IPA, yaitu: tersedia jaket keselamatan, tersedia perlengkapan P3K, tersedia sekoci, tersedia petugas keamanan, tersedia informasi nomor pengaduan, tersedia tempat sampah, tersedia toilet, dan tersedia fasilitas sirkulasi udara.
Characterization of Biodiesel Quality from Transesterification of Palm Oil Using Homogeneous Catalysts KOH and NaOH Endah Kusuma Rastini; Jimmy Jimmy
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 7, No 2 (2022): EDISI SEPTEMBER 2022
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v7i2.4476

Abstract

Biodiesel is a renewable fuel as an alternative fuel in diesel engines. Its use can be combined with petrodiesel. Making biodiesel with a homogeneous catalyst (KOH/NaOH) requires low production costs. This research was conducted to determine the physical and chemical characteristics of biodiesel products using a homogeneous catalyst from food-grade palm oil, which was worked at room temperature, with a stirring time of 8 minutes (200 rpm), the reaction time of 4 hours with a mole ratio of methanol: oil 6:1. The results of the feasibility test for density (KOH 859 kg/m3, NaOH 868 kg/m3) and viscosity (KOH 2.70 cSt, NaOH 3.08 cSt) show that biodiesel meets the quality requirements of biofuels. FFA feasibility test results, acid number, total glycerol, saponification number, and alkyl ester content for biodiesel with KOH catalyst (0.205%, 0.3716 mg ̶ KOH/g, 0.012% ̶ mass, 58.99 mg ̶KOH/g, 99.074% ̶mass, respectively) has met the quality requirements. However, the glycerol content for NaOH has not met the quality requirements for biofuels, so it is necessary to review the optimum conditions. Further testing of biodiesel quality by applying it to diesel engines is required for production feasibility. ABSTRAKBiodiesel merupakan bahan bakar terbarukan sebagai alternatif bahan bakar pada mesin diesel. Penggunaannya dapat dikombinasi dengan petrodiesel. Pembuatan biodiesel dengan katalis homogen (KOH/NaOH) memerlukan biaya produksi yang murah. Penelitian ini dilakukan untuk menentukan karakteristik fisika dan kimia produk biodiesel dengan katalis homogen dari minyak kelapa sawit food grade yang dikerjakan pada temperatur kamar, waktu pengadukan 8 menit (200 rpm), waktu reaksi 4 jam dengan rasio mol methanol:minyak 6:1. Hasil pengujian kelayakan terhadap massa jenis (KOH 859 kg/m3, NaOH 868 kg/m3) dan viskositas (KOH 2,70 cSt, NaOH 3,08 cSt) menunjukkan bahwa biodiesel telah memenuhi syarat mutu bahan bakar nabati. Hasil pengujian kelayakan FFA, bilangan asam, gliserol total, bilangan penyabunan dan kadar ester alkil untuk biodiesel dengan katalis KOH (berturut-turut 0,205%, 0,3716 mg ̶ KOH/g, 0,012% ̶ massa, 58,99 mg ̶ KOH/g, 99,074% ̶ massa) telah memenuhi syarat mutu, namun untuk NaOH kadar gliserol belum memenuhi syarat mutu bahan bakar nabati sehingga perlu dikaji ulang kondisi optimumnya. Pengujian lanjutan kualitas biodiesel dengan mengaplikasikan pada mesin diesel diperlukan untuk kelayakan produksi.

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