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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Pengaruh Penggunaan Soil Stabilization Terhadap Sifat Fisik Beton Dengan Agregat Halus Berkadar Lumpur Tinggi Siregar, Syarif Hidayat; Ismeddiyanto, Ismeddiyanto; Djauhari, Zulfikar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This study examines the physical properties of concrete with high mud fine aggregate by adding soil stabilization. Based on SNI 03-2461-2002, it is stated that fine aggregate should not contain mud more than 5% of the weight. Soil stabilization as addition material in the mortar mixtures could increase the quality of concrete. This research aims to identify the influence of soil stabilization material to the performance of concrete that was the addition mixed with the fine aggregate that contain high percentage. The percentage of mud used in this study were 0%, 5%, 10%, 15%, 20% and 23% of the fine aggregate weight. Percentage of soil stabilization was 1% from concrete’s mud weight. The designed strength of concrete was 20 MPa. All samples were cured by soaking them in normal water for 28 days. The concrete physical properties observed in this study consisted of workability, sorptivity, and porosity. The results of the tests showd that the compressive strength of concrete with 20% variation mud level and added soil stabilization was 30,41% higher compared to concrete without soil stabilization. Sorptivity results in 5% of mud variation with the addition of soil stabilization had the lowest absorption of 16,10% lower than absorption compared to 10% sludge variation. Porosity values in 5% mud variation with the addition of soil stabilization have the smallest porosity of 15.81% lower compared to other mud variations. Based on the results of these tests it could be concluded that the strength of high mud concrete by adding soil stabilization was better than without soil stabilization. Keywords : Physical properties, sorptivity, tensile strength, porosity, soil stabilization, mud
Studi Carbon Footprint dari Kegiatan Pabrik Minyak Sawit PT. Johan Sentosa di Bangkinang, Riau Lestari, Wanda; Sasmita, Aryo; Asmura, Jecky
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Climate change is one of the effects of global warming caused by the greenhouse effect by increasing concentration of greenhouse gases. In response to global warming Indonesia goverment is committed to reducing greenhouse gas emissions 26% by its own effort and 41% if it receives international assistance in 2020. One of the industrial sectors that contributes to greenhouse gas emissions in Indonesia is the Palm Oil Mill (POM) . To find out the total of CO2 emissions produced uses method by Intergovermental Panel on Cilmate Change (IPCC). Total emissions from POM PT. Johan Sentosa is 115.015,18 CO2 eq/year.Keywords: Palm Oil Mill (POM), IPCC, CO2
Pengaruh Penambahan Abu Ampas Tebu Terhadap Sifat Mekanik Beton Pada Campuran Beton Normal Akbar, Ilham; Djauhari, Zulfikar; Suryanita, Reni
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The increasing in the population has an impact on the increasing of housing or bulding demand. The alternative solution to reduce the use of cement is by leveraging on natural materials such as baggase ash as a substitution part of cement in the concrete mixtures. Results from test showed that silicte (SiO2) content in bagasse ash was dominant, so that it might be used as a cement substitution to enhance the properties of the concrete. The specimens were tested at 7, 14, 28 and 56 days of treatment to observe the development of bagasse ash concrete with the variation of the ash at 5 % and 10 % from the weight of the cement. The result showed that the higher percentage of bagasse ash would result lower workability. The compressive strength has also decreased from normal concrete at 28 days of the treatment, at 5 % variaton that has a compressive strength at 21,221 MPa and 10% variation has a result at 16.411 MPa. Propertional to compressive test, the flexural test has also decreased from normal concrete, at 5% variation has a flexural strength at 3.60 MPa and at 10 % variation has a result at 3.40 MPa. It was because imperfect of bond between Ca(OH)2 with SiO2. Hence, instead of cement substitute, bagasse ash rolled better as filler in concrete mixtures. Keywords: bagasse ash, concrete, compressive strength, flexural strength, workability
Penyisihan Cod Pada Limbah Cair Sawit Menggunakan Chlorella Sp. Yang Diimmobilisasi Dalam Flat-Fotobioreaktor Dengan Sistem Semikontinu Denada Curie; Shinta Elystia; Said Zul Amraini
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Palm oil mill effluent is one of the by-products of palm oil producing which contains high organic matter, so it needs a treatment before discarded into the water. One of the treatment method that can be done is by utilizing the organic matter into a source of nutrition for the growth of microalgae Chlorella sp. This study is conducted to determine the ability of microalgae Chlorella sp. in removing COD of palm mill effluent and knowing the specific growth rate of cells Chlorella sp. during the allowance process. Chlorella sp. has a small size, smooth, low density and easily carried by the flow of wastewater, so the cells Chlorella sp. immobilized with calcium alginate to make the cells are more stable and protected from the pressure of wastewater. In this study, the continuous system is carried out by replacing wastewater with fresh wastewater at variations of the wastewater volume replacments 0, 25, 50, 75 (% v/v) at 24 hours contact time. The removing process is carried out for 7 days with irradiation on the light intensity 5000 ± 300 lux and the lighting period (L:D) 12:12. The stirring process uses an aerator with 3 L/minute aeration discharge. The results showed that the 25% wastewater volume replacement was able to put aside the best COD with removal efficiency 85.71% at the best removing process detention time 7 days. Keywords: Chlorella sp., Semicontinuous systems, Palm Oil Mill Effluent, COD, Contact Time.
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (Pcc) Cangkang Telur Itik Melalui Proses Hidrotermal Dengan Variasi Ph Dan Waktu Reaksi Miftah Anugrah; Yelmida Azis; Ahmad Fadli
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is one of the calcium phosphate compounds, which is the main inorganic component of human’s hard tissue such as bones and teeth. Hydroxyapatite (HAp) is a material used as an implant, adsorbent, and catalyst. The purpose of this study were to obtained product of hydroxyapatite from duck egg shell, studied the effect of variations in pH and reaction time on diameter of crystals and degree crystallinity of hydroxyapatite, and obtained the optimum conditions based on variations given. In this study, duck egg shell PCC and (NH4)2HPO4 were reacted using hydrothermal vessels with variations in pH of reactants at 8, 9, 10, 11, and 12, reaction time 15 and 16 hours, ratio of Ca/P 1,77 and HAp being synthesized at 140oC. The results were analyzed using X-Ray Diffractometer (XRD), Scanning Electron Microscopy (SEM-EDX), and Brunaeur-Emmet-Teller (BET). The result shows, the best hydroxyapatite were obtained at 15 hours of reaction time and pH 12 with diameter of crystals 26,91 nm, crystallinity 74,28%, ratio of Ca/P 1,60, and surface area 30,017 m²/g.Keywords: Hydroxyapatite, Hydrothermal, Crystallinity, PCC
Pendekatan Arsitektur Kontemporer Pada Perancangan Galeri Cokelat Pekanbaru Tien Manurung; Yohannes Firzal; Mira Dharma
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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As a result of processed product, chocolate has grown rapidly into a sculpture, clothes, hats and more. Market demands allow for more than chocolate products, but there is still minimal information dissemination about chocolate. Then it will be effective in chronologizing the chocolate products from initial knowledge, current production, to planning future production. Packaging all forms of knowledge about chocolate is more possible in the form of galleries. Chocolate Gallery is the place which is able to present the knowledge about the cultivation of Brown, as well as the results of the work of the chocolate itself. The Gallery is located in the city centre, is an assertion in its own to make an iconic building. The design uses the Contemporary Architecture approach that is authentic with the present nature, as well as the concept of the character of Cocoa's Skin. Key word: Gallery, Chocolate, Contemporary Architecture
Kaji Eksperimental Rugi-Rugi Aliran Campuran Partikel Padat-Udara Dalam Saluran Horizontal Pada Sistem Pneumatic Conveying D.Erianto Simanjuntak; Asral Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Pneumatic Conveyor is a System used to move solid particle from one site to another with air as a medium of transportation.Phenomenon that occurs in Pneumatic Conveying flow systems such as: Pressure losses, channel erosion, formation of deposits on the channel and so on. Channel erosion is seen getting bigger at the bottom of the channel. Besides that solid particles tend to be more concentrated in the bottom of the channel.Testing by varying the flow rate of mass and type of dust by regulating the opening of the channel entrance, the velocity of air flow, resulting in that increasing this variation can increase the pressure drop Channel erosion becomes large when the concentration of dust increases in flow. At the time of testing if there is a buildup in the bottom of the dust channel the system exits longer (transport is not smooth). Then the dust attached to the blower blade will be a new problem for the system. So thus increasing the concentration of dust in the flow can affect the performance of the system.Keywords: Pneumatic Conveying, Dust (Particles), Pressure drop.
Optimasi Jaringan Backbone Multiprotocol Label Switching (MPLS) Menggunakan Routing Protocol EIGRP (Studi Kasus PT. Chevron Pasifik Indonesia) Rifaldo, Rifaldo; Sari, Linna Oktaviana
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Process of sending and receiving data is often a problem in telecommunications networks. Some problems such as the process of sending and receiving data require a long time, thus affecting the quality of services provided. One factor that causes service quality to be less good is the use of routing protocols. The routing protocol used has not yet supported the process of delivering highspeed packets. This study uses a Multiprotocol Label Switching (MPLS) based backbone network and the Enhanced Interior Gateway Routing Protocol (EIGRP) protocol as a packet delivery technology on high-speed backbone networks, MPLS combines several advantages of circuit-switched and packet-switched communication systems that make technology better. The software used is Graphical Network Simulator (GNS3) as a tool to design and simulate MPLS-based backbone networks at PT. Chevron Pacific Indonesia. The result shows MPLS delay from testing the data packet delivery in the form of video streaming is 31.49 ms smaller than the result of testing Non-MPLS delay which is 60.24 ms. In conclusion, MPLS can be implemented in the PT Chevron Pacific Indonesia network because the delay value obtained is smaller than the ITU standard of 150 ms. Keywords: Backbone, MPLS,EIGRP, Delay.
Analisis Produktifitas Tenaga Kerja Pada Pekerjaan Pylon Proyek Pembangunan Jembatan Siak IV Pekanbaru Azizah Fil Ahlia; Rian Tri Komara Iriana; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Labors productivity greatly impacts the success of construction project. Therefore, it is imperative to perform analysis on the determination of labors productivity. The purpose of this research is to find out the coefficient value of labors on the Siak IV Bridge project and to assess coefficient value of labors that has been obtained between coefficient value on the minister of public works regulation No. 28/PRT/M/2016 and project contract document. So, to find the coefficient value, the researcher must know the labor’s productivity whis is important factor for the success of a project, so it needs to ways examine to measure labors productivity in a project. In this study, the measurement of labors productivity was carried out in the upstream and downstream pylon jobs in segment 9 with sub workings reinforcement, formwork, casting by doing observation in the field. Field observation has purpose to find out timing which is needed to finish sub workings. Coefficient which is obtained from result analysis on front pylon for sub working reinforcemant is 0.414 OH for labors, 0.160 OH for workers, 0.032 OH for foreman. On formwork sub working it shows 0.324 OH for labors, 0.88OH for workers, 0.029 OH for foreman. Then the result shows on back pylon analysis sub working reinforcement, 0.432 OH for labors, 0.170 OH for workers, 0.033 OH for foreman. On formwork shows 0.148 OH for labors, 0.049 OH for workers and 0.025 OH for foreman. Coefficient for casting sub working shows 0.304 OH for labors, 0.083 OH for workers and 0.028 OH for foreman.Keywords: Coefficient, Labors, Productivity, Siak IV Bridge Construction.
Sintesa Surfaktan Metil Ester Sulfonat (MES) Dari Palm Oil Metyhl Ester Dan Natrium Bisulfit Menggunakan Katalis CaO; Variasi Rasio Mol Dan Kecepatan Pengadukan Hedri Yanti; Syaiful Bahri; Panca Setia Utama
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Surfactant (surface active agent) is a chemical compound used to reduce the surface tension of the liquid. Surfactants are divided into four groups: anionic, nonionic, cationic and amphoteric. The most widely used surfactant is an anionic surfactant which is synthesized from Linier Alkylbenzene Sulphonate (LABS) a petroleum base surfactant. LABS is not ecofriendly, low resistant to high salinity levels, hard to degradable, expensive and still imported. Methyl Ester Sulfonate (MES) is an anionic surfactant which is currently being developed. These surfactants can be produced from POME. MES produced by sulfonation reaction with addition of sulfonation agents. In this research sodium bisulfite used as sulfonation agent. The aims of this research was to synthesized MES from POME and Sodium Bisulfite (NaHSO3) and Calcium Oxide as the catalyst, to characterize the product, and to study the effects of mole ratio and stirring speed of surface tension and emulsion stability MES. POME obtained from PT. Cemerlang Eka Perkasa Dumai Riau Province. Sulfonation process was carry out at the mole ratio of 1:1, 1:1,5 and 1:2, stirring speed of 300, of 500, of 700 rpm, temperature of 80°C, and the time of 6 hours. The best characteristic of the MES was obtain at stirring speed of 500 rpm and mole ratio of 1:2 density of 0,8659 gr/ml; viscosity of 2,002 cP; pH of 3,52; surface tension of 33,3 dyne/cm; interfacial surface tension of 29,2 dyne/cm and emulsion stability of 89%. The yield of 83,51% can be obtained in this research.Keyword : Methyl Ester, Methyl Ester Sulfonate, Sulfonation, Surfactant.

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