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INDONESIA
Forum Mekanika
Published by Institut Teknologi Perusahaan Listrik Negara
ISSN : 23561491     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering
FORUM MEKANIKA Journal, especially for Civil Engineering Lecturers and generally for all Practitioners to be able to contribute in the form of scientific writing that will be useful for the application of science and technology, especially in the field of Civil Engineering.
Arjuna Subject : -
Articles 85 Documents
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Pengembangan Metode Percepatan Penjadwalan Pada Keterlambatan Proyek EPC Di Fase Pelaksanaan Dengan Analisa “What If” Pratiwi Setyaning Putri; Hastanto S. M Hastanto S. M
FORUM MEKANIKA Vol 8 No 2 (2019): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.471 KB) | DOI: 10.33322/forummekanika.v8i2.537

Abstract

This study aims to analyze corrective actions that can be done if there is a project delay in one of the activities. Data collection techniques are carried out by observation. The gap between the actual and planned scheduling level (productivity gap) is a problem that must be evaluated and the root cause that causes the decline in work productivity is sought. After further evaluation, it is planned to re-target the acceleration that will be achieved both in the short and long term. The acceleration method for scheduling the duration of the project is done by the critical path method or CPM (Critical Path Method) for further development of corrective actions that can be done to overcome the delay in the duration of the project.
Karakteristik Marshall Pada Campuran Asphalt Concrete – Wearing Course (AC-WC) Dengan Penambahan Styrofoam Ika Sulianti; Ibrahim Ibrahim; Agus Subrianto; Adelia Monita; Medici Medici
FORUM MEKANIKA Vol 8 No 2 (2019): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.918 KB) | DOI: 10.33322/forummekanika.v8i2.653

Abstract

Styrofoam waste presents the environment issue because it is difficult to decompose. As an effort to recycle this pollutant, styrofoam can be utilized as an additive in asphalt concrete mixture. The use of additives aims to create a flexible pavement layer having good performance and meet the requirements. The purpose of this study is to find out whether the addition of styrofoam can improve the quality of asphalt mixtures, and look for alternative additives that can increase asphalt pavement performance. In this study, researchers used food container styrofoam as an addition and incorforated into Asphalt Concrete Wearing Course (AC-WC) mixture. The styrofoam content was 6.5%; 6.75%; 7% ; 7.25%; and 7.5% of asphalt weight. The optimum asphalt contentused is 5.5%. The value of the optimum stability was 3126,002 kg, found at 7.25% of styrofoam content. The best results of Marshall test was obtained at 6.5% of styrofoam content with stability value 1362,045 kg, VIM value 4,96%, VMA 15,025%, VFA 67,800%, flow 3,44 mm, and MQ 416,338 kg / mm.
Pengaruh Variasi Bentuk Potongan Agregat Bambu Petung Terhadap Berat Jenis dan Kuat Tekan Beton Ringan Yoga Putra Darmansyah; Farlin Rosyad
FORUM MEKANIKA Vol 8 No 2 (2019): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (344.866 KB) | DOI: 10.33322/forummekanika.v8i2.656

Abstract

The use of bamboo as an aggregate substitution is an effort to reduce the specific gravity of concrete, especially in the production of lightweight concrete. The use of bamboo material has the consequence of decreasing the compressive strength value of concrete. This study aims to determine the magnitude of the effect of the use of bamboo substitution on concrete on the compressive strength and specific gravity values. The bamboo material used is sized 15-30 mm in various shapes. The type of bamboo used is petung bamboo (Dendrocalamus Asper). As for the variations in the use of bamboo in the test specimens are 50% and 75% pieces of bamboo of the same shape, 50% and 75% pieces of bamboo form variations, of the weight of coarse aggregate. The research sample is in the form of a cube test object with a size of 15 cm x 15 cm x 15 cm. Based on the results of the study there was a decrease in the value of the concrete mortar slump along with the addition of the percentage of bamboo aggregate substitution. Concrete absorbs water which is indicated by an increase in water absorption in concrete test specimens which reaches 4.81%. The decrease also occurs in the specific gravity and compressive strength of the test specimen. The minimum value of average concrete density with bamboo substitution for various variations was obtained at 1902.2 kg/m3 (Bamboo Test Objects with Variation Shape 75%), and a maximum of 1991.1 kg/m3 (Bamboo Test Objects with 50% Equal Shape and Objects Bamboo Test Variation in the Form of 50%). The maximum compressive strength value is 135.1 kg/cm2 (Bamboo Test Objects of the Same Shape of 50%) and a minimum of 104.4 kg/cm2 (Bamboo Test Objects of 75% Variation Shape). Variations in the shape of bamboo pieces do not have much effect on the compressive strength of concrete.
Pengaruh Bubuk Fosfor Strontium Dan Limbah Plastik Pada Kuat Tekan Beton Dicki Dian Purnama; Tommy Iduwin; Ranti Hidayawanti
FORUM MEKANIKA Vol 8 No 2 (2019): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (372.792 KB) | DOI: 10.33322/forummekanika.v8i2.751

Abstract

Beton merupakan material konstruksi yang paling lazim digunakan saat ini. Penggunaan beton secara massal akan berdampak pada lingkungan dengan semakin banyaknya eksplorasi material-material penyusunnya. Maka dari itu diperlukan suatu upaya untuk mengurangi resiko kerusakan lingkungan, salah satunya dengan memanfaatkan sisa limbah plastik. Bubuk fosfor strontium digunakan dengan harapan tercipta beton yang dapat berpendar saat gelap. Namun bubuk fosfor strontium masih belum banyak digunakan untuk campuran beton. Tujuan penelitian ini yaitu mengetahui pengaruh penggunaan limbah plastik dan bubuk fosfor strontium dalam hal kuat tekan beton. Penelitian yang akan dilakukan terdiri dari beberapa tahapan, pertama tahap identifikasi masalah dan bahan material penyusun beton, sehingga dapat diketahui karakteristik dari material tersebut. Tahap kedua yaitu desain campuran (mix design) beton yang menggunakan pedoman SNI 03-2834-2000. Tahap ketiga pembuatan benda uji kuat tekan dan panel beton yang dilakukan di laboratorium. Tahap keempat yaitu pengujian benda uji kuat tekan beton serta analisa hasil pengujian. Hasil pengujian kuat tekan beton terbesar yakni pada kondisi beton normal dengan nilai kuat tekan 26,03 MPa pada usia 28 hari dan yang terendah pada variasi 5 sebesar 12,83 MPa pada usia 28 hari.
Pengaruh Penambahan Serbuk Kaca Dan Abu Sekam Pada Tanah Lunak Berdasarkan Uji Konsolidasi Dyah Pratiwi Kusumastuti; Irma Sepriyanna Sepriyanna
FORUM MEKANIKA Vol 8 No 2 (2019): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.429 KB) | DOI: 10.33322/forummekanika.v8i2.882

Abstract

It can not be avoided when the construction must stand on soft soil, then the construction will suffer damage due to subsidence or congestion from soft soil. To improve soft soils as one part of the construction of them is the method of chemical stabilization of the soil. The stabilizer material mixed was 10% glass powder and the percentage of husk ash was 0%, 2.5%, 5%, 7.5% and 10% of the dry weight of the original soil sample. Changes in the characteristics of soft soil and stabilized soils are reviewed based on the consolidation test. Based on the results of the study, the value of the void ratio decreases with increasing glass dust and husk ash, where the lowest void ratio is 0.5328 obtained in the addition of 10% glass powder and 7.5% husk ash. A decrease in the void ratio indicates a decrease in the compression index (Cc) and the swelling index (Cs). The lowering of the compression index and the swelling index indicate that the addition of glass powder and husk ash causes the soft soil sample to become denser. The lowest compressive index and swelling index values ​​were obtained in soil sample specimens with the addition of 10% glass powder and 10% husk ash, which respectively decreased by 35.165% and 75.757% when compared to the condition of the original soil sample.
Pengaruh Variasi Perendaman Beton Purun Tikus Terhadap Kuat Tekan dan Kuat Lentur Beton Ani Firda Firda; Indra Syahrul Fuad
FORUM MEKANIKA Vol 9 No 1 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i1.883

Abstract

ABSTRAK Salah satu bahan tambah beton ialah serat (fiber). Serat dalam beton berfungsi untuk mencegah retak–retak sehingga menjadikan beton lebih daktail dari pada beton biasa dan untuk meningkatkan kekuatan tarik beton. Pemakaian beton pada lingkungan agresif sangat berpengaruh pada keawatan dan nilai kuat tekan dan tarik beton. Struktur beton dapat dikatakan berada pada lingkungan agresif manakala beton terus-menerus berada dalam lingkungan air laut, air rawa, tanah, dan kawasan industri dimana banya terkandung sulfat, beton akan menjadi rentan terhadap serangan sulfat yang dapat mengurangi durabilitas beton dan dapat membuat beton menjadi korosi. Oleh karena itu dalam penelitian ini akan meneliti mengenai seberapa besar pengaruh variasi perendaman air PDAM Tirta Musi (pH=7) dan air rawa (pH<7) dan terhadap kuat tekan dan kuat lentur dengan tambahan serat purun tikus (eleocharis dulcis) sebesar 0.75% selama 28 hari. Hasil penelitian menunjukkan bahwa Perendaman beton mutu fc’ = 20Mpa umur 28 hari menggunakan air rawa (pH=4.5), dapat menurunkan kuat tekan beton normal sebesar 11.63%, sedangkan pada beton purun tikus 0.75% sebesar 4.12%, dibanding beton perendaman air PDAM Tirta Musi (pH=6.5). Perendaman beton mutu fc’ = 20Mpa umur 28 hari menggunakan air rawa (pH=4.5), dapat menurunkan kuat lentur beton normal sebesar 14.8%, sedangkan pada beton purun tikus 0.75% sebesar 5.8%, dibanding beton perendaman air PDAM Tirta Musi (pH=6.5). Keywords : pH air, kuat tekan, kuat lentur, serat purun tikus.
Analisa Tingkat Pelayanan dan Perhitungan Tarif Angkutan Umum Penumpang Trayek Ampera-Tangga Buntung Berdasarkan Biaya Operasional Kendaraan Yules Pramona Zulkarnain
FORUM MEKANIKA Vol 9 No 1 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i1.933

Abstract

Angkutan umum trayek Ampera– Tangga buntung merupakan salah satu angkutan kota yang melayani daerah yang cukup strategis, dilihat dari rute yang menjadi wilayah pelayanannya adalah terminal dan pasar Tangga Buntung, Dermaga penyeberangan Tangga Buntung, kawasan sekolah, perumahan dan berakhir di ikon kota Palembang yaitu Benteng Kuto Besak. Permasalahan yang sering dihadapi oleh pemakai jasa angkutan kota adalah besarnya biaya yang harus dikeluarkan untuk melakukan perjalanan (tarif), biaya waktu tunggu, ketidak nyamanan dan keamanan penumpang , biaya operasional yang harus dikeluarkan untuk mengoperasikan angkutan kota pada tingkat pelayanan tertentu. Penelitian ini membahas Analisa perhitungan tarif angkutan kota berdasarkan Biaya Operasional Kendaraan (BOK) dan tingkat pelayanan angkutan kota trayek Ampera –Tangga Buntung berdasarkan karakteristik pengguna jasa angkyan kota. Berdasarkan hasil pengolahan dan analisis data diketahui bahwa tarif optimum angkutan kota trayek Ampera – Tangga Buntung sebesar Rp.4.200,- dan tarif yang diinginkan konsumen yaitu sebesar Rp.3.000,- pada tingkat pelayanan angkutan kota masih sangat penting dan dibutuhkan oleh masyarakat tetapi perlu peningkatan dan perbaikan sarana dan prasarana untuk kenyamanan dan keamanan pengguna jasa angkutan kotasedangkan jumlah kebutuhan armada angkutan kota yang dibutuhkan sebanyak 17 kendaraan trip pada jam sibuk pagi, pada jam sibuk siang dibutuhkan 9 kendaraan trip dan pada jam sibuk sore dibutuhkan 12 kendaraan trip.
Pemodelan Curah Hujan-Limpasan Pada Sub DAS Cikapundung Hulu Ika Sari Damayanthi Sebayang; Syaefudin Wibowo
FORUM MEKANIKA Vol 9 No 1 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i1.952

Abstract

The Cikapundung River is one of the rivers that divides the city of Bandung and is often used as the main drainage center of the city, the flow of sewage or waste, tourism objects, and raw water sources. This causes the importance of observing reliable discharge values flowing on the Cikapundung River. In this study the authors analyzed the availability of minimum river discharge in Cikapundung Hulu Sub Das using the FJ Mock method. This study uses rainfall data and climatology data. The rainfall data used are rainfall data from Dago Pakar station and Meteo Lembang station, with a span of 10 years while the climatological data used is data from the Bandung Geophysical Station with a span of 10 years. Mainstay discharge calculated using the F.J Mock Method, where in the F.J Mock calculation there are a number of parameters assumed. This modeling test process is by calibrating the parameters assumed by Trial and Error. The average discharge magnitude for Q50, Q80, Q90, and Q95 in calculating the mock model in the period 2008 to 2014 resulted in a value of 3.87 m³ / sec; 2.98 m³ / sec; 2.46 m³ / sec; and 2.21 m³ /sec. While the discharge values of Q50, Q80, Q90, and Q95 in the observation debit produce successive values of 3.85 m³ / sec; 2.45 m³ / sec; 2.05 m³ / sec; and 1.91 m³ / sec. Even with the increase in the calculation period, reliable debit values have a tendency to rise.
Pengaruh Penggunaan Material Daur Ulang Terhadap Sifat Mekanik Beton Non Pasir Tommy Iduwin; Dicki Dian Purnama; Pratiwi Septyaning Putri; Hastanto Siswo Martono
FORUM MEKANIKA Vol 9 No 1 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i1.1080

Abstract

Infrastructure development is increasing every year making the need for concrete materials increases. Using alternative materials can reduce the scarcity of material and environmental damage caused by taking and dredging the material. This research is to find out how much influence the recycled material has on the compressive strength of no fines concrete. The variations used are recycled materials of 0%, 25%, 50%, 75% and 100%. Mechanical testing conducted is a compressive strength test to determine the compressive strength of no fines concrete at the age of 7, 14 and 28 days. The ratio of cement and aggregate used is 1: 4 with FAS 0.5. This research uses 15 x 30 cm cylindrical molds with 45 test specimens. The test results show the highest compressive strength value of non-sand concrete occurs at 0% recycled material by 10.47 Mpa and the lowest compressive strength on non-sand concrete 100% recycled material is 8.39 Mpa. The percentage of absorption of no fines concrete shows that the more recycled material is used, the smaller the value of water absorption. The highest absorption value in no fines concrete is 0% recycled material, which is 5.93% and the smallest value is in the variation of no fines concrete 100% recycled material recycled material that is equal to 4.99%.
Pengaruh Penggunaan Bahan Limbah Polimer Sebagai Campuran Aspal Modifikasi Terhadap Kinerja Marshall Indah Handayasari; Irma Sepriyanna Sepriyanna; Dyah Pratiwi Kusumastuti
FORUM MEKANIKA Vol 9 No 1 (2020): JURNAL FORUM MEKANIKA
Publisher : Sekolah Tinggi Teknik - PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33322/forummekanika.v9i1.1098

Abstract

One of the polymer materials that can be a mixture of asphalt is Ethylene Vinyl Acetate, which is a material that is widely used in making toys and making footwear. This large amount of toys and footwear production waste has only become rubbish and has not been utilized optimally. Ethylene Vinyl Acetate polymers themselves belong to elastomeric polymers which have flexible properties such as rubber, smooth, flexible, resistant to low temperatures, are not easily cracked and are resistant to water. The use of polymer material as a mixture of asphalt has been widely carried out considering that asphalt modification with polymeric materials is known from several tests showing that it has better resistance to deformation and overcoming cracks, so that road construction can be produced more durable and can reduce maintenance and repair costs Street. In this study the use of Ethylene Vinyl Acetate waste on asphalt mixes has a pretty good effect, this is seen from the results of marshall tests that can meet the requirements.

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