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All Journal IPTEK Journal of Proceedings Series Jurnal Konstruksia RACIC : Rab Construction Research Border: Jurnal Arsitektur Jurnal Teslink : Teknik Sipil dan Lingkungan Jurnal Penelitian Rumpun Ilmu Teknik Jurnal Sains dan Teknologi
Firmansyah, Yerry Kahaditu
Universitas Pembangunan Nasional “Veteran” Jawa Timur
Arts Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Social Sciences Transportation

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Modification of Reinforced Concrete Retaining Wall at Pilangbango Reservoir Construction Project Madiun, East Java Mudji Irmawan; Yerry Kahaditu Firmansyah; Afif Navir Refani
IPTEK Journal of Proceedings Series No 1 (2017): The 2nd International Conference on Civil Engineering Research (ICCER) 2016
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23546026.y2017i1.2205

Abstract

The reservoir is the tendon of water in order to accommodate the excess rain water in the rainy season and its utilization in the dry season for various purposes, both in the field of agriculture as well as the interests of the community. To find out the cause of the crack wall of the reservoir Pilangbango Madiun, East Java, then do the test strongly press on concrete walls and soil investigations on the area of the reservoir. Spunpile 400 mm in diameter used by the mounting distance 200 cm and a depth of 12 m and pole mounted on the heels of concrete walls. Manual calculation of the results and analysis of the Finite Element program it can be concluded that in the presence of an additional retaining her 400 spunpile mm using a distance 200 cm and a depth of 12 m, retaining wall construction is then quite able to hold style pillow case and Sliding with style has a safety factor more than 1.5. So the movement of the sliding walls do not happen again.
Analisis Settlement Timbunan Causeway dan Container Yard pada Pembangunan Terminal Multipurpose Labuhan Bajo di Manggarai Barat, Nusa Tenggara Timur Yerry Kahaditu Firmansyah
Jurnal TESLINK : Teknik Sipil dan Lingkungan Vol 5 No 2 (2023): Next Issue on, September 2023
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/teslink.v5i2.276

Abstract

The Labuhan Bajo Multipurpose Terminal, located in West Manggarai, East Nusa Tenggara, has a very important strategic value as the main transportation hub for domestic and international trade. With the increasing demand for the efficient handling of cargo and passenger traffic, the construction of well-designed causeways and container yards is essential to ensure the terminal's long-term functionality and stability. The main objective of this study is to evaluate potential settlement patterns, identify potential risks associated with soil deformation, and propose appropriate mitigation measures to ensure safe and sustainable operation of the terminal. The findings from this research explain the importance of a thorough settlement analysis in large-scale infrastructure projects, especially those involving causeways and container yards. By understanding the response potential of the soil and implementing effective mitigation measures, engineers, contractors and policy makers can increase the resilience of terminals, minimize adverse impacts and ensure their long-term viability.
STUDY OF PREFERENCES FOR STUDENT COMMUNAL SPACE IN THE UPN VETERAN JAWA TIMUR Azkia Avenzoar; Dominikus Aditya Fitriyanto; Yerry Kahaditu Firmansyah
Border: Jurnal Arsitektur Vol. 6 No. 1 (2024): JUNE 2024
Publisher : Department of Architecture, Faculty of Architecture and Design, Universitas Pembangunan Nasional "Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/border.v6i1.766

Abstract

The communal space for students in the university is important to support academic activities, considering that student activities on campus are not only in classrooms, studios, laboratories, and libraries. However, these shared areas are often poorly designed, leading to disruptions and discomfort for users. This research aims to gather preferences for student communal spaces at UPN "Veteran" Jawa Timur. The research objectives include identifying perceptions of the availability of student communal spaces and the activities carried out in these spaces. Furthermore, it aims to identify expectations for the atmosphere and facilities in these communal spaces. The results of the analysis of these expectations for the atmosphere and facilities are then linked to the types of activities. This research is conducted using a qualitative method. Data is collected through online questionnaires distributed to UPN "Veteran" Jawa Timur students and then analyzed using content analysis with stages including open coding, axial coding, and selective coding. The results show that psychological atmosphere factors, as well as thermal, auditory, and visual comfort, are dominant in the desired atmosphere by respondents. Additionally, the expected facilities are electronic and electrical.
PERENCANAAN PERKUATAN LERENG MENGGUNAKAN SHEET PILE SEBAGAI ALTERNATIF DINDING PENAHAN TANAH LERENG JEMBATAN KACA KAB.PROBOLINGGO Dwi Septy Wahyuningdiah; Laily Endah Fatmawati; Yerry Kahaditu Firmansyah
Racic : Rab Construction Research Vol 8 No 2 (2023): DESEMBER
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v8i2.3626

Abstract

Slopes are the plains of the earth that create an angle of inclination on the horizontal side. Slopes are formed in two ways, naturally (geological processes) or man-made. Several ways that can be used to avoid the formation of collapse are retaining walls by identifying the effect of the safety factor on slope stability under existing conditions. In this study it was intended to plan slope reinforcement using sheet piles with the help of the plaxis program and using the manual calculation of the fellenius method to determine the safety factor for slope stability to overcome landslide disasters on glass bridges. The results of this study are the results of the analysis of the factor of safety from manual fellenius calculations and using the help of the Plaxis software before being given reinforcement and after being given sheet pile reinforcement.
Tinjauan Kebutuhan Geotextile pada Timbunan Tinggi di atas Tanah Lunak Achmad Firman Maulana; Evandra Sebastian; Yerry Kahaditu Firmansyah
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 4 No. 1 (2025): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Pusat Riset dan Inovasi Nasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v4i1.4657

Abstract

The process of embankment of the road body aims to create a safe and comfortable transportation route. However, the slopes on the road body often have limited stability and are susceptible to construction failure. The researcher intends to review the stability of the slope on the embankment with various variations in embankment height against the stability of embankment soil located on soft soil with a fairly deep depth. The need for geotextile reinforcement is influenced by the condition of the base soil itself. In geotextiles with the same Tult, the Tult of geotextiles used for all variations of embankment height in this study is 50 kN. The need for the number of geotextiles with the same embankment width and different variations in embankment height, the higher the embankment, the more geotextiles are needed.
Pengaruh Penambahan Fly Ash Terhadap Nilai Indeks Plastisitas Tanah Lanau Berpasir di Jembatan Sine, Tulungagung Marco Dian Qinanta; Yerry Kahaditu Firmansyah; Himatul Farichah
Konstruksia Vol 17 No 2 (2026): Jurnal Konstruksia Vol 17 No. 2 Tahun 2026
Publisher : Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jk.17.2.11-18

Abstract

Pada pembangunan proyek jln Lot 6a, jenis material tanah yang dijadikan timbunan mengacu pada spesifikasi pekerjaan tanah 2016. Area jembatan sine merupakan salah satu lokasi yang kondisi tanahnya tidak memenuhi spesifikasi teknik yang ada, karena termasuk dalam klasifikasi jenis tanah A-7-5 menurut AASHTO dan MH (Lanau elastis dengan pasir) menurut U.S.C.S., maka dari itu diperlukan stabilitas terhadap tanah tersebut. Adapun stabilisasi yang digunakan yaitu dengan menambah fly ash kelas F kedalam tanah. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan fly ash terhadap nilai indeks plastisitas tanah lanau berpasir pada proyek pembangunan khususnya di area jembatan sine. Penambahan fly ash dilakukan dengan 3 variasi yaitu 15% (v1), 20% (v2), dan 25% (v3) dengan parameter pengujian diantaranya berat jenis (GS), batas cair (LL), batas plastis (PL), batas susut (SL), dan indeks plastisitas (PI). Hasil pengujian menunjukkan penurunan terbesar pada penambahan fly ash 25%(v3), dengan nilai pernurunan untuk berat jenis (GS) sebesar 19,33%, batas cair (LL) 13,20%, batas plastis (PL) 5,25%, batas susut (SL) 11,08%, serta indeks plastisitas (PI) 8,07%. Secara keseluruhan, penggunaan fly ash terbukti efektif dalam memperbaiki sifat fisis tanah lanau berpasir, sehingga berpotensi digunakan sebagai bahan stabilisasi alternatif untuk perbaikan tanah dasar (subgrade) pada proyek infrastruktur jalan. Kata kunci: fly ash, tanah lanau berpasir, sifat fisis tanah, stabilisasi tanah, pozzolan
Analisis Neraca Massa Penyisihan Ion Timbal (Pb²⁺) oleh Bioadsorben Daun Rami pada Sistem Adsorpsi Batch Rania Nurlita Sari; Raden Kokoh Haryo Putro; Yerry Kahaditu Firmansyah
Jurnal Sains dan Teknologi Vol. 5 No. 1 (2026): Juni : Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58169/saintek.v5i1.1116

Abstract

Lead (Pb²⁺) contamination in wastewater is a major environmental concern due to its toxicity, persistence, and ability to accumulate in living organisms. Adsorption using biomass-based materials has been developed as an alternative treatment method because it is efficient, economical, and environmentally friendly. This study aimed to analyze the effect of bioadsorbent dosage and contact time on Pb²⁺ removal efficiency and evaluate Pb²⁺ mass distribution using mass balance analysis in a batch adsorption system. Ramie leaf (Boehmeria nivea) was utilized as a bioadsorbent due to its lignocellulosic content, which provides active sites for metal ion adsorption. The research was conducted experimentally through bioadsorbent preparation, chemical activation, and batch adsorption using artificial Pb²⁺ solutions with variations in bioadsorbent dosage and contact time. Pb²⁺ concentrations before and after adsorption were analyzed using Atomic Absorption Spectroscopy (AAS). The obtained data were used to determine removal efficiency and Pb²⁺ distribution between the liquid phase and bioadsorbent. The results showed that ramie leaf bioadsorbent effectively reduced Pb²⁺ concentration, with the optimum condition obtained at 4 g/L bioadsorbent dosage and 90 minutes contact time, achieving 98.46% removal efficiency. Mass balance analysis indicated that Pb²⁺ ions were successfully transferred from the solution phase onto the bioadsorbent surface. These findings demonstrate that ramie leaf bioadsorbent has potential as a sustainable alternative material for heavy metal removal in wastewater treatment.
Co-Authors Achmad Firman Maulana Azkia Avenzoar Dominikus Aditya Fitriyanto Dwi Septy Wahyuningdiah Evandra Sebastian Himatul Farichah Irmawan, Mudji Laily Endah Fatmawati Marco Dian Qinanta Raden Kokoh Haryo Putro Rania Nurlita Sari Refani, Afif Navir