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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Rekayasa Jurnal Rekayasa Sipil dan Desain Teras Jurnal Jurnal Aplikasi Teknik Sipil Journal of Engineering and Scientific Research (JESR) Interdisciplinary Social Studies Journal of the Civil Engineering Forum Jurnal Ilmiah Sistem Informasi dan Ilmu Komputer Jurnal Rekayasa Proses Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung
Masdar Helmi
Universitas Lampung
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Public Health Social Sciences Other

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Development of Concrete Flat Sheetpile Joint Model As A Soil Retaining Wall Muchtar, Billy; Irawan, Agustinus Purna; Helmi, Masdar
Interdisciplinary Social Studies Vol. 4 No. 3 (2025): Regular Issue: April-June 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v4i3.823

Abstract

The problem of soil retaining wall stability is an important concern in civil construction, especially in the use of concrete sheetpile as an efficient and durable structural solution. However, the design of concrete Sheetpile joints still faces challenges in ensuring structural strength, waterproofness, ease of installation, and resistance to extreme environments. This study aims to develop an optimal concrete flat Sheetpile connection model as a soil retaining wall. The research method involves experimental analysis and numerical simulation on various configurations of Sheetpile joints, including testing of mechanical strength, waterproofness, and material testing against environmental factors. The collected data will be analyzed using an experimental design approach and model validation with structural software. Predicted results show that the developed connection model will improve the stability of the ground retaining wall with better installation time efficiency, while meeting safety and sustainability standards. The continuation of the research is directed at the application of the connection model in actual construction projects to evaluate performance in the field and refine the model based on practical implementation feedback.
Perancangan Sistem E-Commerce MotoPart Berbasis Web dengan Metode Waterfall Masdar Helmi; Ahmad Wahyudi; Bagus Rifai; Luthfi Ardeansyah R
Jurnal ilmiah Sistem Informasi dan Ilmu Komputer Vol. 5 No. 1 (2025): Jurnal ilmiah Sistem Informasi dan Ilmu Komputer
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juisik.v5i1.1435

Abstract

This research aims to develop MotoPart, an online marketplace application specifically designed to meet the demand for motorcycle spare parts in Indonesia. The background to the development of this application is the high demand for motorcycle spare parts along with the increasing number of two-wheeled vehicles, as well as various problems still frequently encountered in conventional distribution systems. These problems include limited access to genuine products, inefficiencies in the transaction process, and limited information regarding product availability. MotoPart was developed with the main goal of facilitating digital spare part buying and selling transactions that are easier, safer, and more efficient, as well as building an active, trusted, and integrated automotive ecosystem. In this research, a comprehensive system requirements analysis was conducted, covering functional requirements such as user registration and authentication, product management by sellers, a product search and filter system, a shopping cart feature, digital payments, delivery services, a user review system, notifications, transaction management, and an admin panel for monitoring. Meanwhile, non-functional requirements were also outlined to ensure system performance and reliability, including the required hardware and software specifications. The system design was carried out using a Data Flow Diagram (DFD) approach, starting from the context diagram to level 1 to illustrate the data flow and processes that occur. Furthermore, the database design was designed in detail with tables such as users, products, orders, and order items, to support systematic data management. With the development of MotoPart, it is hoped that it can provide solutions to obstacles in spare parts distribution, guarantee product authenticity, and become part of the digital transformation in the Indonesian automotive sector.
Pengaruh Substitusi Bahan Penyusun Beton Menggunakan Abu Ketel dan Limbah Genteng Terhadap Kuat Tekan Beton Safari, Azka Muhammad; Irianti, Laksmi; Helmi, Masdar; Husni, Hasti Riakara
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 1 (2025): Volume 15 Nomor 1, Maret 2025
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i1.1198

Abstract

Abstrak Hasil dari pembakaran limbah kelapa sawit menghasilkan abu ketel yang dapat dimanfaatkan sebagai bahan pozzolan. Limbah genteng juga dimanfaatkan sebagai substitusi dari agregat kasar. Pembuatan benda uji kubus 15cm x 15cm x 15cm untuk diuji kuat tekan pada umur 3, 7, 14, dan 28 hari, dengan variasi pada bahan penyusunnya 5% abu ketel terhadap berat semen dan 5%, 10%, 15%, dan 20% limbah genteng terhadap berat agregat kasar. Kuat tekan terbesar pada umur 28 hari untuk beton dengan substitusi hanya limbah genteng terdapat pada variasi 5% (G5) dengan kuat tekan 34,86 MPa. Substitusi 5% abu ketel untuk semen pada G5, kuat tekan beton mengalami peningkatan yang cukup signifikan menjadi 37,45 MPa. Hasil kuat tekan pada benda uji dengan kadar limbah genteng lain seluruhnya mengalami peningkatan kuat tekan setelah dilakukan substitusi 5% abu ketel pada semen. Sehingga subtitusi 5% abu ketel dapat meningkatkan kuat tekan pada beton dengan substitusi limbah genteng. Kata kunci: Abu ketel, limbah genteng, kuat tekan Abstract The combustion of palm oil waste produces boiler ash, which can be used as pozzolanic material. Tile waste is also used as a substitute for coarse aggregate. A 15cm x 15cm x 15cm cube specimen was produced to test the compressive strength at 3, 7, 14 and 28 days with variations in the constituents 5% boiler ash by weight of cement and 5%, 10%, 15% and 20% tile waste by weight of coarse aggregate. The highest compressive strength at 28 days for concrete with only tile waste substitution found in the 5% variation (G5) with a compressive strength of 34.86 MPa. Substituting 5% boiler ash for cement in G5, the compressive strength increased to 37,45 MPa. The compressive strength of other variations of tile waste increased after 5% substitution of boiler ash in cement. Therefore, 5% boiler ash substitution can increase the compressive strength of concrete with tile waste substitution. Keywords: boiler ash, tile waste, compressive strength
Pemanfaatan Limbah Industri Berupa Abu Ketel dan Silica Fume Untuk Peningkatan Kuat Tekan Beton Irianti, Laksmi; Helmi, Masdar; Widyawati, Ratna; Abdullah, Habib Ilham; Hidayatullah, Hadi
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1247

Abstract

Abstrak Pembangunan infrastruktur di Indonesia mengalami kemajuan signifikan. Penelitian ini mengeksplorasi penggunaan abu ketel dan silica fume dalam beton sebagai alternatif berkelanjutan. Variasi percobaan mencakup penambahan dan penggantian sebagian semen dengan abu ketel dan silica fume. Hasil menunjukkan bahwa campuran dengan kandungan abu ketel dan silica fume memiliki slump yang lebih rendah, namun meningkatkan kuat tekan pada umur 28 dan 56 hari. Proporsi optimum sebagai bahan tambah adalah 5% abu ketel dan 5% silica fume dengan peningkatan kuat tekan dari 28 hari ke 56 hari sebesar 9,42 MPa sedangkan sebagai bahan pengganti sebagian semen adalah 85% semen, 5% abu ketel, dan 10% silica fume, mencapai kuat tekan beton kubus sebesar 28,93 MPa pada umur 28 hari dan 30,67 MPa pada umur 56 hari. Penelitian ini memberikan wawasan tentang potensi penggunaan limbah kelapa sawit dan sisa industri sebagai bahan tambahan dalam industri konstruksi untuk mendukung pembangunan berkelanjutan.   Kata kunci: Abu Ketel, Silica Fume, Kuat Tekan Beton   Abstract Infrastructure development in Indonesia has experienced significant progress. This research explores the use of palm kettle ash and silica fume in concrete as a sustainable alternative. Experimental variations include adding and replacing some of the cement with palm kettle ash and silica fume. The results showed that the mixture containing palm kettle ash and silica fume had a lower slump, but increased compressive strength at the ages of 28 and 56 days. The optimum proportion as an additive is 5% palm kettle ash and 5% silica fume with an increase in compressive strength from 28 days to 56 days of 9.42 MPa while as a partial replacement material for cement it is 85% cement, 5% palm kettle ash and 10% silica fume, reaching a compressive strength of cube concrete of 28.93 MPa at 28 days and 30.67 MPa at 56 days. This research provides insight into the potential for using palm oil waste and industrial residue as additional materials in the construction industry to support sustainable development.   Keywords: Palm Kernel Ash, Silica Fume, Compressive Strength of Concrete
Pengaruh Styrofoam sebagai Pengganti Sebagian Agregat Kasar terhadap Sifat Mekanik Self-compacting Concrete (SCC) Agustin, Cahyani Putri; Helmi, Masdar; Noorhidana, Vera Agustriana; Isneini, Mohd
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1284

Abstract

Abstrak   Styrofoam merupakan salah satu solusi untuk mengurangi beban mati pada struktur. Styrofoam dalam beton dapat berperan sebagai pengisi udara yang menciptakan void, sehingga styrofoam dapat menghasilkan beton yang lebih ringan. Penelitian ini dilakukan dengan mengganti sebagian agregat kasar dengan 10%, 20%, dan 30% butiran styrofoam pada SCC (Self-compacting Concrete). Hasil uji menunjukkan bahwa semakin tinggi kadar styrofoam, maka akan semakin rendah berat volume, kuat tekan, kuat tarik, kuat lentur, dan akan semakin tinggi daya serap air beton tersebut. Hasil optimum yang diperoleh berdasarkan pengujian kuat tekan, kuat tarik belah, dan kuat lentur ada pada beton dengan kadar styrofoam 10%, dengan hasil pengujian berturut-turut yaitu, 20,6227 MPa, 2,348 MPa, dan 4,3148 MPa, sedangkan untuk Penyerapan air tertinggi terjadi pada BS3 (styrofoam 30%), yang menghasilkan 12,4450% peningkatan daya serap.    Kata kunci: Styrofoam, berat volume, sifat mekanik, self compacting concrete (SCC)   Abstract   Styrofoam is one of the solutions to reduce dead loads on structures. Styrofoam in concrete can act as an air filler that creates voids, so styrofoam can produce lighter concrete. This research was carried out by replacing part of the coarse aggregate with 10%, 20%, and 30% styrofoam granules in SCC (Self-compacting Concrete). The test results show that the higher the styrofoam content, the lower the volume weight, compressive strength, tensile strength, bending strength, and the higher the water absorption of the concrete. The optimum results obtained based on the testing of compressive strength, tensile strength, and flexural strength were on concrete with a styrofoam content of 10%, with consecutive test results of 20.6227 MPa, 2.348 MPa, and 4.3148 MPa, while for the highest water absorption occurred in BS3 (30% styrofoam), which resulted in a 12.4450% increase in absorbency.    Kata kunci: Styrofoam, weight volume, mechanical properties, self-compacting concrete (SCC)
Studi Kinerja Pelat dan Balok Beton Bertulang di Gedung E Fakultas Teknik Universitas Lampung Akibat Getaran Resmonida, Dhea Yulia; Helmi, Masdar; Alami, Fikri
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 2 (2020): Edisi Juni 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i2.1348

Abstract

In General, the plate of building will restrain the live load from various activities on it. Furthermore, this live load may produce structural vibrations which cause the inconvenient condition for the users.  The study aims to evaluate the vibrations of the plate based on testing on fieldand numerical analysis using SAP2000 Software. The analysis calcutionsaccording to ISO 2631-2 : 2003 and steel design guide 11th series floor vibrations due to human activity The measurement on field shows that the compression strength of reinforced concrete for the plate and beams are between K-350 and K-400 which means both of them are medium quality concrete in addition. Thefrequencies of plate are between 12,94 - 23,29 Hz with the acceleration rates of 0,235 - 1,13 m/s². The numerical analysis results that the frequences of plate in 8,05 Hz and 8,13 Hz frequences due to walking load with the accelerations under 0,5% g. Based on both of analysis is concluded that the plate E building is a rigid structure. Keywords: Beam, Plate, Vibrations and Acceleration .
Kajian Permasalahan Getaran pada Pelat dan Balok Beton Bertulang di Gedung E Fakultas Teknik Universitas Lampung Firdasa, Silsila Jana; Alami, Fikri; Helmi, Masdar
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 2 (2020): Edisi Juni 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i2.1350

Abstract

The planning of a building has some criterias that need detailed attention which are the stiffness, strength, stability, flexibility and economical aspect. This result focus for building planner which is need the experimental method that use tools such as hammer test, Ultrasonic Pulse Velocity (UPV) and accelerator. Hence, the numerical method used SAP 2000 v.14.14.0.0. This result the frequency of the building was 1,953 Hz and the acceleration was 0,263 m/s2. Based on the SAP 2000 v.14.14.0.0 calculation, the building frequency was 7,078142 Hz and the acceleration was 0,001005 m/s2. The different results between those two methods were caused by unsatisfying building quality that caused the difference of result between those two methods. The building frequency fitted the specification attached on ISO 2631-2: 2003 but the acceleration was bigger 0,5% than the gravitation. The adding of BJ 37 IWF 350 mm x 175 mm could enhance the vibration frequency from 7,078142-7,3351 Hz as many as 3,630% and the acceleration from 0,001005-0,0009177 m/s2 as many as 8,6865%.Key words: Beam, Plate, Vibration, Frequency, Acceleration.
Pengaruh Serat Baja Terhadap Kuat Tarik Lentur Balok Beton yang Disambung Utami, Tri Ratna; Noorhidana, Vera Agustriana; Sebayang, Surya; Helmi, Masdar
Jurnal Rekayasa Sipil dan Desain Vol. 10 No. 2 (2022): Edisi Juni 2022
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v10i2.2596

Abstract

The casting of concrete at different times often occurs, this is due to insufficient casting time, expansion or connection of structural components, strengthening of structures with additional dimensions, and so on. Thus there will be the addition of a new layer of concrete (overlay). This study is to determine the flexural tensile strength of concrete beams for joining old concrete and new concrete with the addition of steel fiber volume fractions of 0%, 1%, 1.5%, and 2% in the substrate layers overlay and also the compressive strength of the concrete in each layer. The samples in this study were beams (15 x 15 x 60 cm) with a thickness of 7.5 cm for substrate and overlay for flexural tensile strength testing and cylinders (15 cm in diameter and 30 cm in height) for compressive strength testing. From the results of the study, it was found that the flexural tensile strength of the beam with the addition of steel fibers in the substrate layer was higher than the addition of steel fibers in the overlay layer. The addition of steel fibers in the substrate and overlay layers makes the beam more ductile. The maximum flexural tensile strength of the beam with the addition of steel fibers in the substrate layer occurs at  volume fraction 1.5%, has an increase of 114.03% from the joint beam without steel fibers while the addition of steel fibers in the overlay layer occurs at volume fraction 2%, has an increase of 8.66% of the joint beams without steel fibers.
STUDI PERBANDINGAN PEMBEBANAN DINAMIS PADA JEMBATAN BETON TERHADAP PEMODELAN FEA Firdaus, Afridho; Alami, Fikri; Isnaeni, Mohd; Helmi, Masdar
Jurnal Rekayasa Sipil dan Desain Vol. 11 No. 2 (2023): Edisi Juni 2023
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v11i2.3190

Abstract

The natural frequency of the bridge is the frequency to determine the theoretical and experimental feasibility requirements of the bridge. The natural frequency value is used to determine the theoretical and experimental feasibility requirements of the bridge. Analysis of bridge behavior in resisting dynamic loads and comparing theoretical natural frequencies with field tests on prestressed concrete bridges with a span of 40 m using the line model and the shell model in the sap2000 application. Based on the results of bridge modeling using SAP 2000, the natural frequency on the model line is f○ 3.9876 hz and T 0.2507 seconds, while in shell modeling it is obtained f○ 16.045 hz and T 0.6232 seconds. When given a running load the frequency of the bridge in the shell model is f 15.577 hz and T 0.0642 seconds. The natural frequency value obtained from the model line is 3.9876 hz and the natural frequency from the shell model is 16.045 hz which in the shell model the frequency results are closer to the field test results of 16.67 hz with a ratio of 3.75%. The shell model is used as a comparison to the field model.
Pengaruh Air Laut Pada Proses Curing dan Treatment Terhadap Kekuatan Beton Sari, Rendityas Mayang; Helmi, Masdar; Alami, Fikri
Jurnal Rekayasa Sipil dan Desain Vol. 11 No. 3 (2023): Edisi September 2023
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v11i3.3620

Abstract

Pembangunan infrastruktur di wilayah pesisir memerlukan penggunaan bahan konstruksi yang dapat bertahan dalam kondisi terpapar air laut. Namun, air laut memiliki pengaruh yang cukup besar pada kekuatan beton. Penelitian ini bertujuan untuk mengevaluasi dampak air laut dan lingkungan pesisir terhadap kekuatan beton serta tingkat karbonasinya. Sampel beton berbentuk kubus dengan dimensi 15x15x15 cm disubjekkan pada perawatan dengan air tawar dan air laut selama periode 7, 14, 28, dan 56 hari. Hasil penelitian menunjukkan bahwa beton yang diperlakukan dengan air laut memiliki kekuatan tekan yang lebih rendah dibandingkan dengan beton yang diperlakukan dengan air tawar, dengan nilai kekuatan tekan berturut-turut adalah 273,53 kg/cm2 , 302,23 kg/cm2 , 331,21 kg/cm2 , dan 316,01 kg/cm2 . Selain itu, beton yang terpapar lingkungan pesisir juga mengalami penurunan nilai kekuatan tekan pada usia 28 dan 56 hari untuk setiap sampel. Nilai kekuatan tekan pada sampel BAZ adalah 426,63 kg/cm2 ; pada sampel BTZ adalah 384,09 kg/cm2 pada usia 28 hari dan 361,05 kg/cm2 pada usia 56 hari; sementara pada sampel BSZ adalah 351,6 kg/cm2 pada usia 28 hari dan 342,2 kg/cm2 pada usia 56 hari. Hasil uji karbonasi pada usia 28 dan 56 hari menunjukkan bahwa sampel BUR dan BAZ tidak mengalami karbonasi dengan kedalaman 0 mm, sementara sampel BTZ mengalami karbonasi dengan kedalaman 4,4 mm pada usia 28 hari dan 6,4 mm pada usia 56 hari. Sampel BSZ memiliki tingkat karbonasi yang lebih dalam, yaitu 7,4 mm pada usia 28 hari dan 11 mm pada usia 56 hari. Hasil ini mengindikasikan bahwa semakin dalam tingkat karbonasi, semakin menurun kekuatan beton.
Co-Authors Abdullah, Habib Ilham Aditia Reshi Dista Agustin, Cahyani Putri Agustinus Purna Irawan Ahmad Wahyudi Ahmad Zaenudin Alraimi, Ala Ali Qasem Bagus Rifai brina, ardi elsa Dhea Yulia Resmonida Dista, Aditia Reshi Endro Prasetyo Wahono Fikri Alami Fikri Alami Fikri Alami Firdasa, Silsila Jana Firdaus, Afridho Hadi, Ayatullah Hasti Riakara Husni Ika Kustiani Ikromi, Muhammad Fauzan Irawan, Doni Isnaeni, Mohd Isneini, Mohd Isneini, Muhammad Iswan Iswan Jamiatul Akmal kartorono, suyadi Laksmi Irianti Laskmi Irianti Luthfi Ardeansyah R Magnolia, An-Nisa Malau, Joses Aristo Martinus, Martinus Mohd. Isneini Muchtar, Billy Mufidah Aulia Annisa Nadya Safira Nasution, Ali Napiah Niken, Chatarina nur syahidah aini Ratna Widyawati Resmonida, Dhea Yulia Safari, Azka Muhammad Sari, Rendityas Mayang Shirley Savetlana, Shirley silsila jana firdasa Suharno Suharno Sumantri, Devie Arisandy Suri, Yola Andara Pratami Surya Sebayang Surya Sebayang Surya Sebayang Syamsurijal Rasimeng Todo Herdyson Sitohang Tri Ratna Utami Tugiyono Tugiyono Utami, Tri Ratna Vera Agustriana Noorhidana Vera Agustriana Noorhidana Yoga Marta Agustiawan Zikrillah, Daffa