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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 16 Documents
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Search results for , issue "Vol 15, No 2 (2012): NOVEMBER 2012" : 16 Documents clear
Aplikasi Metode Nilai Hasil (Earned Value Method) pada Sistem Pengendalian Proyek Pujihastuti, Siti Yuliani; Priyo, Mandiyo
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Jurnal Semesta Teknika

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Abstract

In a project implementation, the project implementer wants the project completed on time as efficient as possible while the produced quality is in accordance with the initial plan. Therefore, in order to meet the requirements for controlling process and to minimize any deviations that can occur during the project, the earned value method is considered accurate. The aim of this study was to identify the final result of the project which will be achieved in the aspect of cost (whether the project experience gains, losses, or within budget) and time (whether the project is delayed, ended early, or on time as scheduled). The study was conducted on the 4th, 8th, 12th, 16th, and 20th weeks by using the earned value. Earned Value Method, or often called the Concept of Earned Value, is the concept of calculating project costs in accordance with the budget and the scope of job which have been completed or implemented (budgeted cost of works performed). This method combines the cost, schedule, and work performance of a project. Therefore, this method is considered effective in monitoring and controlling project activities.
Studi Kelayakan Investasi Proyek Perumahan pada Proyek Pembangunan Perumahan Aura Tirta Graha Banjarnegara Priyo, Mandiyo
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

The aim of this study is to evaluate the cash flow and the feasibility of the building investment project of Perumahan Aura Tirta Graha Banjarnegara. The data used in this study were collected from the contractor. The collected data were classified into two groups: primary and secondary data. The primary data cover the direct detailed examination of the research objectives. The data were collected by doing interview and observation. On the other hand, the secondary data were the historic data dealing with the plan and implementation of the project. In this study, there were several methods carried out in measuring the criterion of investment feasibility, i.e.: Break Event Point (BEP), Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Profitability Index (PI).  Evaluation results show that every method demonstrated various performance of the investment appropriateness. From the analysis, it can be concluded that the development plan of Perumahan Aura Tirta Graha Banjarnegara has been carefully analyzed and properly implemented.
Analisis Kinerja Ruas Jalan HOS Cokroaminoto Akibat Perkembangan Lalu Lintas di Yogyakarta Gustav, Reza
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

Yogyakarta is a region with high traffic. It also has high population density. These matters have been predicted to cause transportation problems. HOS Cokroaminoto Street, as a road in urban city center, has the potential to have such problems. Analysis and evaluation needs to be done to maintain good performance of the road. Manual Kapasitas Jalan Indonesia 1997 is used to measure the performance of traffic which includes operational analysis and the planning of urban roads. Level of Service Criteria (LSC) is determined based on the regulation of The Ministry of Transportation KM No. 14 of 2006. Traffic data had been obtained by counting the number of vehicles for 3 days on the busy-hour. These data were presented in tabular data of the vehicle, and then the performance of the traffic was analyzed. For urban roads, form UR-1, UR-2, and UR-3 (MKJI 1997) are used. Based on the results of the performance analysis on HOS Cokroaminoto Street with MKJI 1997 method, in 2010, the degree of saturation (DS) of the road is 0.43. It means that, in LSC term, this road is in level B. It is predicted that, in 2016-2020, this road will not satisfy the eligibility standard (DS> 0.75). This shows that the performance improvement of HOS Cokroaminoto Street is required. From the alternative solutions, the scenario of side friction reduction is more rational to maintain the eligibility and performance of HOS Cokroaminoto Street.
Unjuk Kerja Resapan Air Hujan Barid, Burhan; Nugroho, Prasetyo Adi; Huda, Asri Lutfi
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

Nowadays, the environmental problems that often occur are flood in wet season and drought in dry season. This happens because the rainwater runoff cannot seep into the ground well and the ground water level is decreased.  Excessive surface runoff can be reduced by a simple water infiltration wells on the land. To determine the efficiency of absorption well, a model was created using infiltration rainfall simulator unit to create the condition of heavy rain. This study aims to analyze the relationship between times and several parameters: soil moisture, the changes in the groundwater table, the runoff time, the volume of rainfall infiltration, and to determine the reliability of models with changes in water table. The study was conducted using the infiltration model unit which was made of steel plate with a size of 170x170x200 cm3. This model is divided into three spaces. The first space, which its size is 150x150x200 cm3, has two tests. The first one is labeled as A test and filled with medium silt with the elevation of -150 cm. The B test is filled with medium clay with the elevation of -125 cm. The second space, with the dimension of 170x20x200 cm3, is used to control the ground water level. The third space is used for measuring absorption capability and has dimension of 30x30x100 cm3. This model has nine holes on each side for measuring soil moisture and the 12th hole underneath is used for measuring changes in ground water level. After the artificial rain descended for 120 minutes, soil moisture and ground water level changes measured in every 10 minutes.
Analisis Volume, Kecepatan, dan Kepadatan Lalu Lintas dengan Metode Greenshields dan Greenberg Widodo, Wahyu; Wicaksono, Nur; Harwin, Harwin
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

The creation of a transportation system that ensures the movement of people, vehicles, or goods in a smooth, safe, fast, cheap, convenient, and environmentally friendly way has been the goal of country development. An increase in traffic volume will cause a change in traffic behavior. Theoretically, there is a fundamental relationship between the flow, speed, and density of traffic. Activities and land use will affect the performance of a variety of roads. Land in Jalan Wates Km 5 is used as commercial and market area that is the center of the crowd. The purpose of this study was to determine: speed, traffic volume, density, capacity, and the relationship between speed, volume and density using Greenshields and Greenberg methods, degree of saturation, and level of service. The study was conducted in one day. The result showed that the capacity of the road is still able to accommodate the volume of existing traffic.
Pengaruh Penggunaan Bambu Sebagai Pengganti Agregat Split terhadap Kuat Tekan Beton Ringan Pujianto, As’at; Tajuddin, M.
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

The use of bamboo as an aggregate replacement is one of the efforts to reduce the density and static load of structural elements, sincethe structural strength of bamboo is high. This study focus on the issue of the using bamboo as aggregate concrete with flowing method on a review of specific gravity and compressive strength of the concrete. This study uses bamboo as a percentage of the aggregate at 0% (normal), 20%, 40%, 60%, 80% and 100% of the conventional split and using additional silicafume aggregates. Specimens used in this study is the concrete cylinder (diameter 15 cm and height 30 cm). The identification and testing of tap density after 14 days of treatment.Results show that using more bamboo aggregate will result lower slump value, higher water absorption, decreasing in both specific gravity and compressive strength.
Pengaruh Penambahan Parutan Karet Ban Gradasi Tipe 2 terhadap Parameter Marshall pada Campuran Hot Rolled Sheet Wearing Course Hardwiyono, Sentot
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

The provision of road infrastructure cannot be separated with the pavement construction itself. One of the materials used is asphalt that is really related to natural resources. Using asphalt is not durable in many cases because of the oxidation process, mainly due to heating. This can lead the road (flexible pavement) to fast deformation, including cracking. Nowadays, there are many additives to improve the asphalt quality. One of them is adding rubber to the asphalt which can give more durability under high temperatures, increase its adhesion, and improve its flexibility. This study used the additives in the form of shredded rubber with the content of 20%, 21%, and 22% of the total mass of asphalt. The shredded rubber was mixed with the asphalt, and then heated at least 45 minutes before mixing it with the aggregates. The HRS WC mixture with the tire rubber was compared in term of optimum asphalt content and Marshall results. The results show that adding shredded tire rubber in HRS WC mixture can decrease the flow. This shows that the addition of shredded rubber can decrease of the sample deformation, so that the mix will not be too plastic and easily deformed under the loading. It can also increase the VIM and decrease the VFA, so that it can reduce the bleeding possibility.
Pengaruh Penggunaan Abu Sekam Padi sebagai Bahan Pengisi pada Campuran Hot Rolled Asphalt terhadap Sifat Uji Marshall Rosyidi, Sri P. Atmaja
Jurnal Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
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Abstract

Rice Husk Ash (RHA) has fairly high content of SiO2 and easily obtainable. It is inexpensive since it is the residual waste of the tile or brick combustion process that is not utilized properly. RHA has the potential to be used as filler in Hot Rolled Asphalt (HRA) since it has high flexibility mixture design. The influential characteristic of RHA is that it has fine aggregate fraction. This study aims to discover the physical properties of RHA, the characteristic of the Marshall test properties, the optimum bitumen content, and the economical comparison between the RHA-mixed HRA and the conventional one using stone dust filler. The results of this study indicate that the use of the RHA is able to increase the optimum bitumen content. In terms of economical comparison, the use of RHA as filler material is much more economical than using stone dust as filler.
Unjuk Kerja Resapan Air Hujan Barid, Burhan; Nugroho, Prasetyo Adi; Huda, Asri Lutfi
Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i2.1325

Abstract

Nowadays, the environmental problems that often occur are flood in wet season and drought in dry season. This happens because the rainwater runoff cannot seep into the ground well and the ground water level is decreased.  Excessive surface runoff can be reduced by a simple water infiltration wells on the land. To determine the efficiency of absorption well, a model was created using infiltration rainfall simulator unit to create the condition of heavy rain. This study aims to analyze the relationship between times and several parameters: soil moisture, the changes in the groundwater table, the runoff time, the volume of rainfall infiltration, and to determine the reliability of models with changes in water table. The study was conducted using the infiltration model unit which was made of steel plate with a size of 170x170x200 cm3. This model is divided into three spaces. The first space, which its size is 150x150x200 cm3, has two tests. The first one is labeled as A test and filled with medium silt with the elevation of -150 cm. The B test is filled with medium clay with the elevation of -125 cm. The second space, with the dimension of 170x20x200 cm3, is used to control the ground water level. The third space is used for measuring absorption capability and has dimension of 30x30x100 cm3. This model has nine holes on each side for measuring soil moisture and the 12th hole underneath is used for measuring changes in ground water level. After the artificial rain descended for 120 minutes, soil moisture and ground water level changes measured in every 10 minutes.
Pengaruh Penambahan Parutan Karet Ban Gradasi Tipe 2 terhadap Parameter Marshall pada Campuran Hot Rolled Sheet Wearing Course Sentot Hardwiyono
Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i2.1358

Abstract

The provision of road infrastructure cannot be separated with the pavement construction itself. One of the materials used is asphalt that is really related to natural resources. Using asphalt is not durable in many cases because of the oxidation process, mainly due to heating. This can lead the road (flexible pavement) to fast deformation, including cracking. Nowadays, there are many additives to improve the asphalt quality. One of them is adding rubber to the asphalt which can give more durability under high temperatures, increase its adhesion, and improve its flexibility. This study used the additives in the form of shredded rubber with the content of 20%, 21%, and 22% of the total mass of asphalt. The shredded rubber was mixed with the asphalt, and then heated at least 45 minutes before mixing it with the aggregates. The HRS WC mixture with the tire rubber was compared in term of optimum asphalt content and Marshall results. The results show that adding shredded tire rubber in HRS WC mixture can decrease the flow. This shows that the addition of shredded rubber can decrease of the sample deformation, so that the mix will not be too plastic and easily deformed under the loading. It can also increase the VIM and decrease the VFA, so that it can reduce the bleeding possibility.

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