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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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Analisis Percepatan Pelaksanaan Pekerjaan Pada Proyek Pembangunan Jalan Simpang Petai - Sari Galuh (Majapahit) Kecamatan Rumbio Jaya Kabupaten Kampar Adipa, Tomi; Trikomara, Rian; Taufik, Hendra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Project management in construction covers both time and cost control. Any delay related to construction work may result in cost escalation of which the contractor of the project should pay. The construction of Simpang Petai – Sari Galuh (Majapahit) road project is having work delay along the way to its completion. The work completion at week 32nd can only be fulfilled at 26,08% from its initial target of 37,35% resultingin the project having a marginal delay of 11,27%. Such delay on project should be treated by accelerating the works on the project on the remaining works. Work acceleration can be done by using overtime work alternative, equipment and worker addition alternative, and shift work system alternative. The analysis conducted focuses on works that are in critical line. From the analysis result, it can be obtained cost addition from each alternative used to accelerate works. Cost addition from the analysis are;Rp.5.221.985.034,25 from overtime work alternative; Rp.14.352.243.801,50 from equipment and worker addition alternative; and Rp.11.001.593.778,46 from shift work system alternative.Keywords : construction delay, construction cost, duration control, overtime work, equipment and worker addition, shift work.
Analisis Kerentanan Pantai Pulau Bengkalis Berbasis Sistem Imformasi Geografis Panggabean, Grace Julianti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Coastal area has an important role for the people who live nearby but it is prone to damage. The damage to the coastal area require countermeasures so that its impact can be minimised or eliminated. Prior to countermeasure, vulnerability analysis needs to be done by specifying coastal vulnerability index (CVI). This research was conducted along the northern coast of Bengkalis Island which is directly adjacent to Malacca Strait. Coastal vulnerability index is calculated with the value of the physical variables such as shoreline changes, visual observation, the length and width of the damage, the width of the green belt, lithology, wave height, tidal range, land use, and coastal slope. The required data for the research are landsat imagery, hydro-oceanography, bathymetry, and visual observation of damage. Results of anaysis showed that Simpang Ayam Village, Jangkang Village, Teluk Papal Village, Bantan Air Village, Teluk Pambang Village have very high coastal vulnerability. Sekodi Village has high coastalvulnerability. Area that has a moderate coastal vulnerability is Prapat Tunggal Village. Selat Baru Village, Teluk Kembung Luar Village, dan Teluk Lancar Village have low vulnerability.Keys word: Coastal vulnerablity Index (CVI), Landsat Imagery, Prone to damage
Model Pintu Air Di Daerah Pasang Surut Untuk Mengurangi Intrusi Air Laut Herdianto, Dwi Ori; Siswanto, Siswanto; Rinaldi, Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Rainfed located in coastal areas needs floodgates that serves as seawater intrusion barrier, a permanent construction has been built on desa Bantan, Kab. Bengkalis to model floodgates in form of combination of holes and threshold that function in such way. With the scientific research that has been conducted, parameters of the building which is regarded as a breakthrough can be determined. Other than that, in order to obtained the flow profile this research also yields the coefficient of discharge (Cd), correlation of discharge coefficient and height different (ΔH) and the correlation between discharge coefficient and discharge. Which is shown in the form of a logarithmic equation. With a range of discharge 101.44 cm3 / s ~ 524.89 cm3 / s , the obtained values of Cd range 0.191 ~ 0.464 cm 3 / s , and the shape of a logarithmic equation ΔH relation to the variation of Cd and Cd = 1 is 0.088 ln ( ΔH ) - 0 , 3 , while the logarithmic equation and Q is therelationship Cd Cd = 0.1212 ln ( Q ) - 0,311.Key Word :Rainfed, floodgates, hole and threshold, discharge coefficient, logarithmic equation .
Analisis Dampak Perubahan Tata Guna Lahan DAS Siak Bagian Hulu Terhadap Debit Banjir Junius Nainggolan; Yohanna Lilis H; Sigit Sutikno
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Historical data discharge in Upper Siak watershed is incrase event caused by the land use change. This study aims to analyze the effect of land use change on the flood discharge in Upper Siak watershed. This Study analyze flood discharge by using HEC-HMS (Hydrologic Engineering Centre-Hydrologic Modelling System) software with input data models in the form of daily rainfall data, land use maps of 2003 and 2012 and soil type maps. The result showed that there is significant changes in land use on land farming with icrease of 28,8 %, meanwhile there is changes in land use on forest with reduction to 34,4 %. Peak flood on 25-year return period incrase to 13,3 m3/s (5.9 %) and peak flood on the 50-year return period incrase of 14,1 m3/s (6.1 %).Keywords: land use change, flood discharge, HEC-HMS
Perbandingan Penggunaan Data Hujan Satelit Dan Data Hujan Lapangan Untuk Pemodelan Hidrologi Hujan-Aliran (Studi Kasus DAS Tapung Kiri) Linggasari, Rahma Setya; Sutikno, Sigit; Handayani, Yohanna Lilis
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Abstract

Data availability for hidrologic modeling usually become a problem because of incompleteness and imprecision data. The development of advanced technology recently encourage the development of hydrological modeling by using remote sensing data. This research conducted rainfall-runoff modeling using remote sensing data and ground rainfall data with Integrated Flood Analysis System (IFAS) tools and took a case study in Tapung Kiri sub-watershed in Riau Province. This model was simulated and calibrated with rainfall-runoff periode of forward verification (2005-2006) and backward verification (2006-2005). The results of this research shows that the model to be optimal after calibration process in rain satellite data backward verification period from 1 January to 31 December 2005 by corellation value (R) 0.75, volume error (VE) of 3.22%, and coefficient of efficiency (CE) 0.9. It means that this model has a high degree of association with measurement data (0,7 < R < 1,0), the difference of volume can be tolerated ( VE < 5%), and effiency of this modeling with measurement discharge is highly efficient (CE > 0,75).Key words : rainfall-runoff modeling, satellite data, ground rainfall data, IFAS Model
Peramalan Tinggi Gelombang Transmisi Dengan Permodelan Gelombang Irreguler Pada Pemecah Gelombang Kantong Pasir Tipe Tenggelam Menggunakan Artifical Neural Network (ANN) Muhammad Rico Saputra; Imam Suprayogi; Ferry Fatnanta
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

There are some conditions and problems in coastal engineering that can’t be solved by mathematical analysis. ANN method is a soft computing method has been usesd to solve many problems in any cases. Judging from the success of the research is the application of ANN method, it is necessary to prove the performance of the ANN method to predict transmission waves for sandbag breakwater.The Incoming wave, period, slope, width crest, freeboard, shape and arrangement of sandbags are the parameter that can be used as the test variables. The process to get the result is consisted by training, testing, and validation process. The algorithm used in the development of ANN model is backpropagation algorithm.The results obtained in this study indicate that the performance of the ANN model that has been made to produce the value of the test statistic parameters of the correlation coefficient (R) and Root Mean Square Error (RMSE) that categorized as a very strong correlation and has small error. The best forecasting scheme obtained that the forecasting which resulted in a correlation coefficient (R) is 0.95111 and RMSE value 0.6529 cm.Keywords: forecasting, ANN, Transmission waves, Breakwater
Kajian Antisipasi Defisit Air Daerah Irigasi Sei Paku Pada Kondisi Kering Meteorologis ( Daerah Irigasi Sei Paku, Kecamatan Kampar Kiri, Kabupaten Kampar) Sudarmanto Sudarmanto; Mudjiatko Mudjiatko; Trimaijon Trimaijon
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Abstract

Sei paku irrigation area is located in Kampar Kiri District, Kampar Regency, Riau Province, this irrigation area is specifically planned for rice fields with total area of ± 1000 Hectares. Function change from agricultural land into fish ponds and palm plantation resulted potential land decrease to ± 350 Hectares. Uncontrolled water utilization for fish pond, channels leakage and influence of meteorological factors resulted water supply shortage for agricultural land and water deficit for certain month.Analysis of evapotranspiration, effective precipitation, percolation and water replacement are used to determine the value of the rice water requirement of plant and crops planting. Fish pond water demand and oil palm plantations is used as a reduction of the value of intake discharge, which then the rest of discharge will be used as a main rate of flow for fulfilling plants water needs. In March, May and July crop water requirement is greater than the mainstay discharge, then a simulation done by allocation of planting schedule that is 5 group for rice planting and 3 group for crops planting.The results showed that planting schedule can reduce the value of the maximum water deficit in the existing condition that is 0.36 m3 / s to 0.041 m3 / s or decreased 88.61%, but the deficit is still occurs. So it is necessary to do a Long Storage planning with 2000m long, width 5m and 5m depth with a land area of 1.2 hectares which function as water reservoir that can be used to fulfilling the crops water needs on dry meteorological conditions.Keywords: Sei Paku Irrigation Area, water deficit, water balance, critical discharge, weirs, and long storage
Pemanfaatan Abu Terbang (Fly Ash) Sebagai Bahan Subtitusi Semen Pada Sebagian Sifat Beton Segar Dan Beton Keras Panjaitan, Aprizal; Djauhari, Zulfikar; Kurniawandy, Alex
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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The research aims to obtain the characteristic of fresh and hard concrete using fly ash as substitute material on normal concrete. It is focused on analyzing the bulk density, workability, setting time, permeability and sulfate resistance. The percentage of fly ash waste that is used are 0% and 30% of the weight of the cement. The results show that using 30% of fly ash decrease the workability and bulk density on concrete. Meanwhile, the setting time with 30% of fly ashsubstitution is faster compared to 0% fly ash substitution. The use of 30% fly ash also increase the value of permeability on those concrete. At the testing of sulfate resistance, concrete with 0% of fly ash increases the compressive strength at ageof 28 and 56 days, then will decrease at the age of 90 days. Meanwhile, for 30 % of fly ash, the compressive strength decreases at the age of 56 and 90 days.Keywords : fly ash, bulk density, workability, setting time, permeability, sulfate resistance
Pengaruh Tegangan Listrik Dan Waktu Pelapisan Hidroksiapatit Pada Logam 316L Dengan Metode Elektroforesis Deposisi (EPD) Mayang Sari; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Stainless steel 316L is a metal which used to bone plate, this metal has low biocompatibility in a human body. The stainless steel 316L need to be coated by HA for increased their biocompatibility. The purpose of this research is to learn the effect of applied voltage and deposition time, then characterize HA coated 316L stainless steel. Stainless steel 316L put into alcohol and water solution for 1 hour. The HA powder was deposited by electrophoretic deposition (EPD) using carbon as anode and stainless steel 316L as cathode. It was observed from SEM analysis that HA deposited on stainless steel increased with higher voltage, thickness of HA layer on stainless steel was 30 μm, 45 μm and 55 μm for deposition 17 minutes and applied voltage 40, 60 and 80 volt. Thickness of HA layer on substrate increased, as the time deposition increased with result 30 μm dan 55 μm at deposition 80 volt and deposition time 2 and 17 minutes. HA coatings at applied voltage 80 volt and deposition time 17 minutes was obtained suitable for bone plate.Keywords : Coating, Electrophoretic Deposition, Hydroxyapatite, Stainless Steel 316L
Pemanfaatan Limbah Abu Terbang (Fly Ash) Batubara Sebagai Bahan Pembuatan Beton Geopolimer Yuanda, Dedi; Fadli, Ahmad; Drastinawati, Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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Fly ash has a high content of silica and alumina that potential as a subtitute of portland cement. In this study fly ash is utilized for making geopolimer concrete materials. The geopolymer was sinthesized from fly ash Paiton Power Plant using 8 ,10, 12 and 14 NaOH solution and Na-silicate/NaOH. Na-silicate/NaOH ratio used in this study were 0,8;1,2;1,6;2,0. and 80oC for curing temperature. The geopolymer were test in porosity, compressive strength, leached value and it’s morphology. The compressive strength test showed that 14 NaOH solution and 2.0 Na-silicate/NaOH weight ratio were the strongest. It’s value was 7.56 MPa and it’s porosity was 0,0249. It was also found that the compressive strength increases with the composition of NaOH solution and Na-silicate/NaOH weight ratio. The result of TCLP test shows that for Pb, Cu, Cr are still below the quality standards based on PP No.85 TH 1999 and is still considered harmless.Keywords: geopolymer concrete;fly ash; NaOH solution; leached

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