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All Journal Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain Makara Journal of Technology Journal of Infrastructure and Construction Technology
Andius Dasa Putra
Universitas Lampung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Studi Daya Dukung Tanah Lempung Lunak menggunakan Ecomix. Setyanto, .; Putra, Andius Dasa; Permana, Erik
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 17, No 3 (2013): Edisi Desember 2013
Publisher : UNIVERSITAS LAMPUNG

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Abstract

In this research, the soil to test is soft clay soil from Rawa Sragi area of Belimbing Sari village, inJabung sub district of East Lampung regency, Lampung province. The soil properties were as thefollowing: specific gravity 2.546; water content 50.64%, liquid limit 61.26%, plasticity limit30.77%, plasticity index 30.49%, and material sieve passing no. 200 was 90.42%. Additive mate-rial to use was Ecomix. There were three treatments of ecomix mixtures of 3 gr, 4 gr, and 5gr with0.4 kg cement and 6 kg soft clay soil samples. The mixture samples were letting aside for 7 daysand soaked for 4 days.The results showed that the ecomix addition to mixture or cement and soft clay soil was able toimprove the soil mechanical and physical properties. The physical test results such as specificgravity, optimal water content, and plasticity index tests showed decreasing results after soil sta -bilization. The maximum CBR value was obtained in mixture of 34.49% in non-soaked condition,while the lowest CBR value was 8.2% soaked condition. The CBR test results showed that the soilmixture of ecomix additive material and cement can be used for road construction subgrade be-cause the CBR value was ≥ 6%
ANALISIS KAWASAN KESELAMATAN OPERASI PENERBANGAN (KKOP) BANDAR UDARA PEKON SERAI DI KABUPATEN LAMPUNG BARAT Putra, Andius Dasa; Purba, Alexander
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 13, No 2 (2009): Edisi Agustus Tahun 2009
Publisher : UNIVERSITAS LAMPUNG

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As the one requirement for air transport safety and airport operating is Obstacle LimitaionSurface (OLS) area. The aimed of this research is to determining the major obstacle limitationsurface, consist of take-off and landing surface, possibility accident area, conical area, innerhorizontal, outer horizontal, transition area, and instrument of navigation posistion. This researchas inputing program to Pemerintah Daerah Kabupaten Lampung Barat to prevent of high buildingand tower BTS who would be disturb or give the risk for air transport operation at the SeraiAirport. Based on the observation and geodetic calculation we can determining of ObstacelLimitaion Surface (OLS) area at Serai Airport. Thsi research shown that high building and towerBTS by height about 70 – 120 m, not enter in this area of obstacle limitation surface.Furthermore, Pemerintah Kabupaten Lampung Barat will prepare and make a regulation abouthow many height of building who considered will be allowed in the Obstacel Limitation Surface(OLS) area.
Mechanical Behavior of Clay Soil Stabilized with Fly Ash and Bottom Ash Nugroho, Soewignjo Agus; Zulnasari, Azra; Fatnanta, Ferry; Putra, Andius Dasa
Makara Journal of Technology Vol. 26, No. 1
Publisher : UI Scholars Hub

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Soil is one of the most important aspects of an infrastructure given its functions of receiving and holding structural loads. However, not all soils have good physical and mechanical properties. To overcome those conditions, stabilization of the soil is practiced to meet the technical requirements. This study aims to determine the behavior of high plasticity clay stabilized with lime, fly ash, and bottom ash. These additives can be used as a stabilizing agent to increase soil strength. The percentage of additives varied from 5%–25% then mixed with clay and were tested through the (Unconfined Compression Strength (UCS) test. The UCS test was carried out with 6 treatments, including consecutively non-curing and unsoaked, non-curing and soaked, curing for 7 days and unsoaked, cured for 7 days and soaked, cured for 28 days and unsoaked, and cured for 28 days and soaked. Results show that the UCS value increased along with the span of curing time. Meanwhile, the soaking treatment of the sample decreased the UCS value.
Manajemen Penjadwalan Menggunakan Microsoft Project dan Analisis Risiko pada Proyek Pembangunan RSPTN Universitas Lampung Alviani, Enggar; Putra, Andius Dasa; Siregar, Amril Maruf; Usman, Kristianto
Jurnal Rekayasa Sipil dan Desain Vol 11, No 2 (2023): Edisi Juni 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Pelaksanaan proyek konstruksi melibatkan serangkaian kegiatan atau pekerjaan yang kompleks dan saling berketerkaitan satu sama lain. Proyek RSPTN Universitas Lampung memiliki potensi risiko yang cukup tinggi dan akan memakan waktu pelaksanaan yang cukup lama mengingat besarnya bobot pekerjaan sehingga dapat menyebabkan keterlambatan, pembengkakkan biaya dan berbagai macam risiko.. Untuk mengantasi hal tersebut diperlukan analisis mengenai penjadwalan guna mencapai efektivitas dan efisiensi yang cukup tinggi serta analisis mengenai faktor risiko terhadap biaya dan waktu agar dapat diidentifikasi dan dikelola dengan baik pada kemungkinan risiko yang akan terjadi. Analisis penjadwalan dilakukan dengan menggunakan Precedence Diagram Method (PDM) dan bantuan perangkat lunak Microsoft Project, sedangkan untuk metode analisis risiko yang digunakan adalah analisis semi kuantitatif, dimana skala-skala deskriptif yang digunakan dalam analisa kuantitatif diberi nilai. Berdasarkan hasil pengolahan data didapatkan bahwa durasi kegiatan normal proyek, yaitu 176 hari, dan pekerjaan yang berada pada lintasan kritis sebanyak 60 pekerjaan dimana sebagian besar berada pada pekerjaan struktur kolom dan dari analisis faktor risiko didapatkan beberapa faktor risiko dominan yakni cuaca tidak menentu, kerusakan atau kehilangan material, kecelakaan tenaga kerja, kesalahan estimasi biaya dan waktu, serta timbulnya kemacetan di sekitar proyek. Kemudian setelah dianalisis kembali penjadwalan setelah terpengaruh oleh faktor risiko didapatkan durasi proyek menjadi 240 hari dengan 50 pekerjaan kritis. Kata kunci : Precedence Diagram Method, Microsoft Project, Risiko, Jadwal.
Tinjauan Prioritas Peningkatan Ruas Jalan Kabupaten Pesawaran Dalam Meningkatkan Pengembangan Wilayah Kabupaten Pesawaran Prangesty, Agnes Regina; Putra, Andius Dasa; Ofrial, Siti Anugrah Mulya Putri; Sulistyorini, Rahayu
Jurnal Rekayasa Sipil dan Desain Vol 11, No 1 (2023): Edisi Maret 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Abstract Pesawaran Regency has a strategic value in increasing the regional development of Lampung province. Regional development aims to improve regional welfare by utilizing all available resources so that whole community gets the maximum benefit. There are indicators that can help develop the territory of a district, namely the availability of infrastructure and road network systems in the region. In order to improve road network infrastructure, a method is needed, namely by setting priorities because the large number of road sections in Pesawaran Regency can result in limited time, costs, manpower, and resources in improving the quality of road network infrastructure. In this study, the Analytical Hierarchy Process (AHP) method was used as a determinant of priority order with the criteria used, namely road conditions, accessibility, mobility, public service infrastructure, and regional development. From the results of the calculations and analysis that has been carried out, it is found that the main criteria that determine priorities are road condition criteria (45,52%), in addition there are accessibility criteria (22,06%), mobility criteria (13,64%), public service infrastructure criteria (10,32%), and regional development criteria (8,46%). The order of priority for the improvement of the Pesawaran Regency road sections includes Kubu Batu - Kota Jawa, Pasar Baru - Gunung Sari, Penengahan - Gunung Sari, Kubu Batu - Lubuk Tanah, Tegineneng - Tri Rahayu, Sidodadi - Pringsewu Boundary, Way Harong - Sukamandi, Wiyono - Way Brulu, Wates - Sumber Jaya, Guyuban - Pringsewu Boundary. Key words : Regional Development, Priority, Analytical Hierarchy Process Abstrak Kabupaten Pesawaran memiliki nilai strategis dalam meningkatkan pengembangan wilayah provinsi Lampung. Pengembangan wilayah bertujuan untuk meningkatkan kesejahteraan wilayah dengan memanfaatkan seluruh sumberdaya yang dimiliki agar seluruh masyarakat memperoleh manfaat yang sebesar-besarnya. Terdapat indikator yang dapat membantu pengembangan wilayah suatu kabupaten yaitu ketersediaannya Infrastruktur dan sistem jaringan jalan di wilayah tersebut. Dalam rangka meningkatkan infrastruktur jaringan jalan diperlukan suatu cara yaitu dengan menetapkan prioritas karena banyaknya ruas jalan Kabupaten Pesawaran dapat mengakibatkan adanya keterbatasan waktu, biaya, tenaga, dan sumber daya dalam meningkatkan kualitas seluruh jaringan jalan yang ada. Pada penelitian ini digunakan metode Proses Hierarki Analitik sebagai penentu urutan prioritas dengan kriteria yang digunakan yaitu kriteria kondisi jalan, aksesibilitas, mobilitas, prasarana layanan publik, dan pengembangan wilayah. Dari hasil perhitungan dan analisis yang telah dilaksanakan Dapatkan kriteria utama yang menjadi penentu dalam menetapkan prioritas yaitu kriteria kondisi jalan (45,52%), selain itu kriteria aksesibilitas (22,06%), kriteria mobilitas (13,64%), kriteria prasarana layanan publik (10,32%), dan kriteria pengembangan wilayah (8,46%). Adapun urutan prioritas peningkatan ruas jalan Kabupaten Pesawaran diantaranya ruas Kubu Batu - Kota Jawa, Pasar Baru - Gunung Sari, Penengahan - Gunung Sari, Kubu Batu - Lubuk Tanah, Tegineneng - Tri Rahayu, Sidodadi - Batas Pringsewu, Way Harong - Sukamandi, Wiyono - Way Brulu, Wates - Sumber Jaya, Guyuban - Batas Pringsewu. Kata kunci : Pengembangan Wilayah, Prioritas, Proses Hierarki Analitik
Upaya Peningkatan Daya Dukung Tanah Dasar (Subgrade) dengan Menggunakan Campuran Fly Ash, Bottom Ash dan Silika Putri, Silfa Nayyira; Putra, Andius Dasa; Iswan, Iswan; Syah, Aminudin
Jurnal Rekayasa Sipil dan Desain Vol 11, No 3 (2023): Edisi September 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Soil or subgrade is the place where the construction made by technicians for personal and collective interests stands. Before starting a construction, soils that have low bearing capacity, water absorption and high plasticity can be stabilised by soil stabilisation methods. Soil stabilization may involve the use of chemical stabilization materials. This research aims to determine the effect and get the appropriate comparison of the results of the addition of a mixture of fly ash, bottom ash and silica. This research study was conducted using soil samples from Kalianda subdistrict and stabilization materials in the form of fly ash, bottom ash and silica matured for 24 hours. Tests were conducted at the Soil Mechanics Laboratory and physical and mechanical properties were tested.. Clay soils classified as A-7-5 (AASHTO) and OH (USCS) mixed with 4 different compositions of stabilising materials had different results. Of the 4 compositions, the mixture that has the largest bearing capacity value is only silica. Because the results of the CBR test on the mixture that added silica were greater than the mixture using only fly ash and bottom ash. Fly ash, bottom ash and silica gel are easily found or affordable, but the use of silica can increase costs due to its relatively expensive price, inversely proportional to the very affordable price of fly ash and bottom ash.  
Pengaruh Spasi dan Panjang pada Kelompok Tiang Terbuka di Pasir: Studi Model Kelompok Tiang dan Fondasi Blok Agus Nugroho, Soewignjo; Satibi, Syawal; Putra, Andius Dasa; Andriani, Andriani
Journal of Infrastructure and Construction Technology Vol. 1 No. 2 (2023): July 2023
Publisher : Dept. of Civil Engineering Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56208/jictech.1.2.45-51

Abstract

Planning for existing construction requires taking into consideration the exact location of the structure; sandy soil is typically found in Indonesia, and pile foundations are a very frequently used type of support. Whenever the stable soil is located at a quite deep depth or when the building's foundation is situated on a relatively high embankment, the pile foundation is utilized to support the structure. Given the quantity of pile foundations utilized in Riau, where soft soil makes up the majority of the soil type, a study on pile foundations is necessary. A possible research approach involves conducting a small-scale pile foundation modeling experiment to determine the group pile's bearing capacity on sand soil, taking into account variations in the pile's length and space. Direct testing on a pile foundation model with length, spacing, and length variations of 20, 30, and 40 cm as well as spacing variations of 2.5D, D, and 5D was used for the research. Pile group length 40 cm has the highest capacity, according to the results of a direct loading test conducted with a spacing of 2.5D. According to the findings of the Terzaghi and Peck method interpretation, the pile with a length of 40cm and 2.5D spaces has the largest qult of 1.665 kN. A pile with a length of 40cm and 2.5D pile spacing is the pile with the largest qult of 2.232 kN, followed by a pile with a length of 30cm and a space of 2.5D. Based on the results of the investigation, it can be stated that Qult will get higher the more closely spaced the pile exists and that Qult will become higher the longer the pile is on the foundation model.
Co-Authors . Setyanto Agus Nugroho, Soewignjo Alexander Purba Alviani, Enggar Andriani Andriani Erik Permana Ferry Fatnanta Iswan Iswan Kristianto Usman Ofrial, Siti Anugrah Mulya Putri Prangesty, Agnes Regina Putri, Silfa Nayyira Rahayu Sulistyorini Satibi, Syawal siregar, amril maruf Soewignjo Agus Nugroho Syah, Aminudin Zulnasari, Azra