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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 Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Journal of the Civil Engineering Forum Jurnal Ilmiah Sistem Informasi dan Ilmu Komputer Jurnal Dieksis ID Jurnal Rekayasa Proses Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung
Masdar Helmi
Universitas Lampung
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Public Health Social Sciences Other

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Green Building Assessment and Recommendations for Optimization Case Study of the Rectorate Building the University of Lampung Ika Kustiani; Masdar Helmi; Nur Syahidah Aini
Journal of Engineering and Scientific Research Vol. 5 No. 1 (2023)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jesr.v5i1.135

Abstract

The Green Building Concept is a concept that offers a method of managing buildings with less energy and resources utilization to minimize the environmental impact. Since its implementation to be mandator, it is time for the University of Lampung to start implementing this concept. This research was aimed at assessing the Rectorate Building rating based on the national standard on Green Building Certification (Greenship-GBCI). There were several steps in conducting this research. Firstly, an opinion survey was conducted to measure the level of satisfaction of the building’s users. Secondly, a series of measurements related to lighting, temperature, humidity, noise, and air quality were carried out. Furthermore, an interview survey related to the operation and maintenance of the building were conducted. Finally, all of these data were entered in the Green Building rating tool for existing buildings. The results showed that the Rectorate Building score was 23 out of 117. This score is way below the score for a bronze rating of 35. Therefore, corrective action must be taken in order the building operation management to meet the Greenship-GBCI standard. Assessment also needs to be done on buildings througout the university for a reference in developing the University of Lampung Eco-campus program.
Pengaruh Abu Ketel sebagai Bahan Penambah Campuran Beton Normal terhadap Kuat Tekan Hidayatullah, Hadi; Irianti, Laksmi; Helmi, Masdar; Widyawati, Ratna
Jurnal Rekayasa Sipil dan Desain Vol 12, No 1 (2024): Edisi Maret 2024
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Much of the kettle ash waste found in palm oil mills is wasted and can pollute the environment. Therefore, efforts need to be made to handle this waste. One of them is its use as an additional ingredient in concrete mixtures. . This research aims to analyze the effect of kettle ash on the rate of increase in compressive strength through laboratory testing with variations in kettle ash used, namely 0%, 5%, 10%, 15% and 20% of the cement weight. The test specimens have dimensions of 15 cm x 15 cm x 15 cm with testing times at 3 days, 7 days, 14 days, 28 days and 56 days. Based on analysis of research data, it was found that the majority experienced an increase in the compressive strength of concrete without additional materials. Increases occurred at 3 days, 7 days, 14 days and 28 days. The percentage increase in compressive strength for the majority decreased at the age of 3 days, 7 days, 14 days. Meanwhile, at the age of 56 days the majority experienced an increase in the percentage of compressive strength which was caused by a quite significant increase in compressive strength. The highest compressive strength at 56 days was produced by test object code BAK 1 of 38.59 MPa
Penentuan Letak Pengukuran Reflected Temperature dengan Menggunakan Termokopel pada Pengujian Termografi Aktif Terhadap Beton Bertulang Ikromi, Muhammad Fauzan; kartorono, suyadi; Helmi, Masdar; Isneini, Mohd
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

AbstrakPengujian termografi aktif merupakan salah satu pengujian non-destruktif yang menggunakan kamera inframerah sebagai perekam dan menghasilkan termogram. Termogram merupakan interpretasi energi panas yang diterima oleh sensor termal kamera inframerah yang masih mengandung noise. Reflected temperature (Trefl) merupakan salah satu noise yang muncul dari pengujian termografi aktif dan akan digunakan sebagai nilai koreksi. penelitian ini menyajikan suatu metode untuk mencari posisi pemasangan termokopel di sekitar sumber panas, sehingga nilai suhu pada posisi tersebut digunakan sebagai nilai Trefl untuk memperbaiki noise pada termogram. Sampel beton berbentuk kubus dengan ukuran 10x10x15 cm diukur suhu permukaannya menggunakan termokopel dan kamera inframerah sejauh 1 meter. Hasil penelitian menunjukkan selisih hasil pengukuran menggunakan termokopel dan termografi sebesar 2,349 ℃, lalu rata-rata nilai Trefl yang didapatkan dari pengujian termografi aktif sebesar 51,649℃ terletak 13 cm dari atas papan grid sebesar dan 5 cm di depan lampu halogen. Suhu permukaan beton sebelum dikoreksi memiliki nilai yang lebih tinggi karena memiliki noise, namun setelah dilakukan analisis perhitungan suhu mengalami penurunan dan mendekati suhu hasil pengukuran termokopel dengan analisis kesalahan (ΔTerr) rata-rata didapatkan 1,448%. Berdasarkan hasil analisis terebut menunjukkan akurasi data kesalahan tergolong bagus karena nilai rata-rata analisis kesalahan (ΔTerr) <5%.Kata kunci : Reflected Temperature, Termografi aktif, Pengujian Non-destruktif
Pengaruh Pasir Laut Sebagai Campuran dan Air Laut Untuk Curing Terhadap Kuat Tekan Beton Zikrillah, Daffa; Helmi, Masdar; Isneini, Mohd; Alami, Fikri
Jurnal Rekayasa Sipil dan Desain Vol 11, No 3 (2023): Edisi September 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

AbstrakIndonesia merupakan negara maritim Namun dikarenakan belum meratanya akses masyarakat terhadap air bersih dan langkanya pasir yang sesuai standar, membuat banyak pembangunan yang dilakukan di pesisir pantai dilakukan dengan material yang tidak sesuai dengan standar dan mengakibatkan berubahnya kekuatan beton. Dalam penelitian ini dibahas kuat tekan beton yang menggunakan material pasir laut dan curing menggunakan air laut dimana didapatkan hasil bahwa pasir laut dan curing dengan air laut memiliki dampak negatif terhadap kuat tekan beton dibandingkan menggunakan pasir sungai dan curing dengan air tawar menggunakan sample beton kubus 15x15x15 cm sejumlah 48 sample dengan 2 variasi campuran dan 2 metode curing diuji di umur 7, 14, 28, dan 56 hari. Hasil kuat tekan beton yang menggunakan material pasir laut dan curing menggunakan air laut dimana didapat hasil BPLCT memiliki kuat tekan yang lebih rendah dibanding BNCT senilai 336,1 kg/cm2 dan BNCT senilai 355,9 kg/cm2 pada umur 28 hari dan curing dengan air laut memiliki dampak negatif terhadap kuat tekan beton dibandingkan menggunakan pasir sungai dan curing dengan air tawar dengan nilai BNCL 331,2 kg/cm2 dibanding BNCT senilai 355,9 kg/cm2 pada umur 28 hari. Dapat disimpulkan bahwa penggunaan pasir laut sebagai pencampur beton dan air laut sebagai curing beton menghasilkan pengaruh buruk terhadap kuat tekan beton.Kata kunci : pasir laut, air laut, dan kuat tekan
Perbandingan Antara Regangan Susut yang Terjadi pada Jalan Beton di Iklim Tropis Lembap dan Prediksi ACI 209R-92 Malau, Joses Aristo; Niken, Chatarina; Helmi, Masdar; Irianti, Laksmi
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

Jurnal ini membahas tentang perbandingan antara prediksi susut ACI 209R-92 dengan susut yang terjadi dalam perkerasan kaku. Penelitian ini dilakukan di Indonesia, yang memiliki iklim tropis lembab dengan suhu dan kelembapan yang tinggi sepanjang tahun. Perilaku beton akan berbeda dengan negara yang memiliki empat musim seperti Amerika Serikat, tempat dimana ACI diterbitkan. Benda uji yang digunakan dalam penelitian ini berukuran 5m × 4,5m × 0.3m. Regangan susut beton didapatkan dari pembacaaan keempat alat vibrating wire strain gauges(VWSG) yang ditanam dalam beton. Pengamatan dilakukan sampai beton berusia 90 hari. Hasil dari regangan beton kemudian dibandingkan dengan prediksi ACI 209R-92. Hasil regangan beton yang terbesar terjadi pada daerah tengah pelat (VWSG 1) dikarenakan daerah tengah memiliki luasan yang berkontak langsung dengan udara sekitar paling besar, jadi suhu dan kelembapan sekitar bisa masuk ke dalam beton dan mempercepat penguapan air yang ada dalam beton. Hasil prediksi dari ACI 209R-92 sekitar 15,6%-36,7% lebih kecil daripada hasil penelitian. Perbedaan ini disebabkan karena lokasi penelitian ini memiliki suhu yang cukup tinggi dankelembapan tinggi karena berada di iklim tropis.
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 : Jurnal Rekayasa Sipil dan Desain

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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 : Jurnal Rekayasa Sipil dan Desain

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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.
Pengaruh Perendaman Air Laut Terhadap Kuat Tekan dan Permeabilitas Beton irawan, doni; Niken, Chatarina; Zaenudin, Ahmad; Helmi, Masdar
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract

AbstractConcrete is one of the most commonly used building materials in infrastructure, including buildings in marine environments. This research aims to provide an overview of the strength of concrete due to exposure to sea water and compare it with protected concrete. The research was carried out experimentally using the SNI 03 - 2834 - 2000 mix design method by testing the compressive strength and permeability of concrete with a total of 30 test objects. The concrete is given a protected treatment and submerged in sea water. The results of research on the compressive strength of protected concrete aged 28, 56 and 90 days were 22, 56 MPa, 24.35 MPa and 25.84 MPa respectively. Meanwhile, the compressive strength of concrete submerged in sea water aged 28, 56 and 90 days is 22.27 MPa, 17.67 MPa and 16.10 MPa. Meanwhile, testing the permeability of concrete using the natural method (immersing the concrete in sea water) showed that the permeability of concrete aged 28, 56 and 90 days was 27.7 mm, 35.0 mm and 40.7 mm. The greater the permeability of the concrete, the smaller the compressive strength of the concrete and the smaller the permeability of the concrete, the greater the compressive strength value. Sea water can reduce the compressive strength of concrete based on the soaking time. In this case it is recommended when building construction in a marine environment to make the concrete watertight. Key words : compressive strength, concrete, concrete permeability, sea water. AbstrakBeton adalah salah satu bahan bangunan yang paling umum digunakan dalam infrastruktur termasuk bangunan yang ada dalam lingkungan laut. Penelitian ini bertujuan untuk mengetahui gambaran mengenai kekuatan beton akibat terpapar oleh air laut dan membandingkan dengan beton terlindung. Penelitian dilakukan secara eksperimental dengan metode mix design SNI 03 – 2834 – 2000 dengan pengujian kuat tekan dan permeabilitas beton dengan jumlah benda uji sebanyak 30 sampel. Beton diberikan perlakuan terlindung dan terendam air laut. Diperoleh hasil penelitian kuat tekan beton terlindung umur 28, 56 dan 90 hari berturut – turut sebesar 22, 56 MPa, 24,35 MPa dan 25,84 MPa. Sedangkankuat tekan beton terendam air laut umur 28, 56 dan 90 hari sebesar 22,27 MPa, 17,67 MPa dan 16,10 MPa. Sedangkan pengujian permeabilitas beton menggunakan metode alami (merendam beton di air laut) diperoleh permeabilitas beton umur 28,56 dan 90 hari sebesar 27,7 mm, 35,0 mm dan 40,7 mm. Semakin besar permeabilitas beton maka akan semakin kecil kuat tekan beton dan semakin kecil permeabilitas beton maka nilai kuat tekan akan semakin besar. Air laut dapat menurunkan kuat tekan beton berdasarkan lama perendaman. Dalam hal ini disarankan dalam pembangunan kontruksi dilingkungan laut untuk membuat beton kedap air.Kata kunci : air laut, beton, kuat tekan, permeabilitas beton.
Effects of Carbon Fiber on Mechanical Properties of Reactive Powder Concrete Helmi, Masdar; Alraimi, Ala Ali Qasem
Journal of the Civil Engineering Forum Vol. 10 No. 3 (September 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.12439

Abstract

The use of fiber generally might change the mechanical properties of concrete in flexural or compressive strength. Reactive powder concrete (RPC) is one of the ultra-high-performance concrete types that has been applied for some constructions. Carbon fiber, having high strength in tensile, also has the potency to improve the physical characteristics of RPC. The purpose of this study is to evaluate the flexural and compressive performance of RPC, focusing on the interfacial binding of carbon fiber. Flexural and compressive tests used samples with dimensions of 40 x 40 x 160 mm were tested in accordance with BS-EN-196-1:2011, which allows to use one of the two broken pieces from the flexural test as the sample. The microstructure surrounding carbon fiber and paste was qualitatively compared using Scanning Electron Microscopy (SEM) in the secondary electron detector mode. Samples were subjected to static pressure at 8 MPa after 1 hour of pouring and heat curing at 240 °C in a dry oven after demolding. Results show that the presence of carbon fiber increased the flexural strength of RPC by up to 28.85% for samples without treatments and up to 14.32% for samples with both treatments. Although carbon fiber increased toughness by 20% and flexural modulus by 6%, it had no effect on the failure mode after reaching the peak load, which remained brittle. On the other hand, the presence of carbon fiber had little effect on compressive strength. Despite the pressure and heat, curing treatments had no effect on enhancing the adhesion between carbon fiber and cement paste, which was indicated by theundamaged surface of carbon fiber. However, the implementation of both treatments on samples might produce RPC with good mechanical properties in flexure.
Increasing The Strength of Cellular Lightweight Concrete Bricks with The Addition of Bamboo Fiber Magnolia, An-Nisa; Akmal, Jamiatul; Martinus, Martinus; Savetlana, Shirley; Helmi, Masdar
Jurnal Rekayasa Proses Vol 18 No 2 (2024): Volume 18, Number 2, 2024
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.15320

Abstract

This research aims to obtain technology for improving the quality of CLC (Celullar Lightweight Concrete) bricks to be equivalent to AAC (Autoclaved Aerated Concrete). This is a response to the rapid development, especially in the property sector, which is followed by the increasing need for bricks as the main material for building walls. CLC bricks are an alternative product other than red bricks that have the potential to pollute the environment because in the production process there is burning. The problem is that the quality of CLC bricks is relatively lower compared to AAC bricks. The method is to add bamboo fiber as a reinforcement and optimize the elements. The design of the experiment was made using the Taguchi Method, but preliminary experiments had previously been carried out to predict the percentage of elements. The research includes manufacturing process technology and quality testing on samples. Bamboo fiber-reinforced CLC bricks are obtained with an optimal composition of 0.5% fiber and a ratio of cement mass to sand mass of 1:1.6. This sample has a compressive strength of 1.1235 MPa and a bending strength of 1.1723 MPa. From this composition, samples were obtained with an average compressive strength of 1.1285 MPa and an average bending strength of 1.3551 MPa. Thus, it can be concluded that the addition of fiber can increase the strength of CLC bricks to be equal to or stronger than AAC bricks on the market.
Co-Authors Abdullah, Habib Ilham Aditia Reshi Dista Agustin, Cahyani Putri Agustinus Purna Irawan Agustriana, Vera Ahmad Wahyudi Ahmad Zaenudin Alraimi, Ala Ali Qasem An Nisa Magnolia Bagus Rifai Basith A, Muhammad Billy Muchtar 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 Ilham Fajar Khairi Irawan, Doni Islamy, Zamzami Isnaeni, Mohd Isneini, Mohd Isneini, Muhammad Iswan Iswan Jamiatul Akmal kartorono, suyadi Laksmi Irianti Laskmi Irianti Luthfi Ardeansyah R Malau, Joses Aristo Martinus, Martinus Medi Yandriguna Mohd. Isneini Mufidah Aulia Annisa muhammad karami Nadya Safira Nasution, Ali Napiah Niken DWSBU Niken, Chatarina Noorhayati, Siti Mahmudah nur syahidah aini Rahayu Sulistyorini Ratna Widyawati Resmonida, Dhea Yulia Safari, Azka Muhammad Sari, Rendityas Mayang Shirley Savetlana, Shirley silsila jana firdasa Suharno Suharno Sumantri, Devie Arisandy Supratman, Hadi 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