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All Journal Rekayasa Sipil JMPM (Jurnal Material dan Proses Manufaktur) Turbo : Jurnal Program Studi Teknik Mesin International Journal of Marine Engineering Innovation and Research Jurnal Pengabdian kepada Masyarakat Nusantara Nusantara Hasana Journal Batara Wisnu : Indonesian Journal of Community Services Yudishtira Journal : Indonesian Journal of Finance and Strategy Inside
Rosalina, Amanda
Shipbulding Engineering Department, Shipbuilding Polytechnic Institute Surabaya
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Nursing Physics Social Sciences Transportation

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EDUKASI PEMILAHAN SAMPAH ORGANIK DAN ANORGANIK PADA ANAK-ANAK KB-RA MASJID JENDERAL SUDIRMAN SURABAYA Rosalina, Amanda; Sholihah, Mar’atus; Sari, Nur Fajar Aprilia; Gastriani, Ovi Prina; Rismawati, Ria; Fajardini, Ridhani Anita
Batara Wisnu : Indonesian Journal of Community Services Vol. 5 No. 1 (2025): Batara Wisnu | Januari - April 2025
Publisher : Gapenas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53363/bw.v5i1.351

Abstract

Efforts to conserve the environment must begin with small, tangible actions in one's immediate surroundings. Waste management is particularly critical, as every human activity has the potential to generate waste. Therefore, it is crucial to educate young children about the environmental impacts of waste to cultivate their awareness and concern for their environment. This community service initiative aims to enhance early childhood awareness of waste management's importance at KB-RA Masjid Jenderal Sudirman Surabaya through a comprehensive waste sorting program for organic and inorganic materials. The methodology employs a participatory approach, actively engaging children in learning activities. Evaluation involves conducting pre-tests and post-tests, which include giving children different kinds of organic and inorganic waste samples and assessing them to sort the waste into appropriate bins. Data is processed and analyzed using the paired sample T-test approach with Minitab software. The study's results indicate a significant increase in knowledge following educational sessions and assistance in sorting organic and inorganic waste. It is anticipated that this positive behavior will extend to their homes and communities, making waste sorting a concrete step towards mitigating environmental issues caused by waste
PENGARUH PILIHAN AUDITOR EKSTERNAL TERHADAP KUALITAS LAPORAN KEUANGAN PADA PERUSAHAAN PERBANKAN YANG TERDAFTAR DI BURSA EFEK INDONESIA Gastriani, Ovi Prina; Sholihah, Mar'atus; Rosalina, Amanda; Sari, Nur Fajar Aprilia; Rismawati, Ria; Fajardini, Ridhani Anita
Yudishtira Journal : Indonesian Journal of Finance and Strategy Inside Vol. 4 No. 3 (2024): Yudishtira Journal : Indonesian Journal of Finance and Strategy Inside
Publisher : Gapenas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53363/yud.v4i3.119

Abstract

This study aims to determine the effect of auditor choice, in this case Big-4 and Non-Big-4 Affiliated Auditors, on the Financial Reporting Quality in Banking Companies listed on the Indonesia Stock Exchange. The dependent variable in this study is Financial Reporting Quality with the proxy of Discretionary Accruals which are estimated using the Cross-Sectional Modified Jones Model. Meanwhile, the Independent Variable uses Big-4 or Non-Big-4 Auditor Choices. Hypothesis testing was carried out using Multiple Linear Regression analysis in 43 banking companies for 6 (six) years, namely 2016 – 2021. The test results show that the auditor choice has a negative effect on discretionary accruals. Thus, the auditor choice has an influence on the quality of financial statements.
PEMANFAATAN LIMBAH SANDBLASTING INDUSTRI PERKAPALAN MENJADI PRODUK BATA BETON PEJAL MENDUKUNG MATERIAL HIJAU Nur Fajar Aprilia Sari; Luqman Cahyono; Amanda Rosalina; Maret’atus Sholihah; Ria Rismawati; Ovi Prina Gastriani; Muhammad Akbar Febianto
Nusantara Hasana Journal Vol. 5 No. 4 (2025): Nusantara Hasana Journal, September 2025
Publisher : Yayasan Nusantara Hasana Berdikari

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59003/nhj.v5i4.1705

Abstract

Indonesia, as a maritime country, has industrial activities that generate a large amount of waste. One of the largest waste-producing sectors is the shipping industry, particularly from ship maintenance and repair activities in shipyards. In this industry, there is a process called sandblasting, which is used to clean ship surfaces from rust, old paint, and other contaminants. The silica sand used in this sandblasting process is classified as hazardous and toxic waste (B3 waste). This waste poses a risk of environmental pollution if not properly managed.The research problem in this study is how to utilize sandblasting waste as an alternative material in the production of solid concrete bricks. The objective of the study is to process this waste into technically and environmentally feasible solid concrete bricks. The methods used include chemical characterization of raw materials using XRF, making test specimens in the form of 50 × 50 × 50 mm cubes, and conducting compressive strength and TCLP (Toxicity Characteristic Leaching Procedure) tests. The results show that the A2 variation produced a compressive strength of 142 kg/cm², exceeding the SNI 03-0349:1989 standard for quality I concrete bricks, and the TCLP test results indicated that the levels of Cu and Cr met the quality standards set by Government Regulation No. 22 of 2021. Therefore, solid concrete bricks made from hazardous and toxic waste are considered feasible as an environmentally friendly alternative construction material.
Analysis of Fly Ash and Sandblasting Waste Addition in Cementitious Composite Lawn Table Reinforced by Cocofiber and Wiremesh Primaningtyas, Widya Emilia; Auliyasari, Inshiro; Pratiwi, Wiwik Dwi; Nisazarifa, Adristi; Nursyifaulkhair, Desrilia; Rosalina, Amanda
International Journal of Marine Engineering Innovation and Research Vol 9, No 4 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i4.21852

Abstract

Concrete technology has significantly advanced and remains an interesting research topic. The demand for cement usage rises significantly due to concrete usage in various sectors. Cement production leads to air pollution issues and causes a greenhouse effect, even in the modern filtration era. Fly ash is an industrial waste that has been identified as a viable substitute for cement due to its pozzolanic properties. Silica Sand is sandblasting waste, where added value is needed. This study investigates the effectiveness of fly ash substitution in the cement portion of cementitious composite materials as an effort to minimize cement usage. Using sandblasting waste is an effort to implement 3R activity (reduce, reuse, recycle) for maritime waste.  Compressive and tensile tests were evaluated in the variation of fly ash substitution for cementitious composite reinforced by coco fiber and wiremesh model. The results show that a 40% fly ash substitution gives the highest compressive strength of 32.98 MPa and the tensile strength of 5.90 N/mm². The best model composition provides the increments of compressive and tensile strength compared to the control specimen at 43.60% and 12.60%, respectively. ANOVA tests confirmed the significance of the enhancing effect as the presence of fly ash, both for compressive and tensile strength. Additionally, static analysis simulations using Fusion360 software were performed and indicated that the cementitious composite lawn table prototype’s design is safe and has good formability, as a safety factor performed 2.26, exceeding the required value of 2.00. This result explicates that fly ash and waste materials can be effectively used in cementitious composites for practical applications.
Eco-Friendly Cellular Lightweight Concrete Partition Walls Using Sandblasting Waste for Seismic Mitigation Cahyono, Luqman; Dermawan, Denny; Pratiwi, Wiwik Dwi; Widiana, Dika Rahayu; Utomo, Agung Prasetyo; Fahmi, M. Rizal; Rosalina, Amanda; Suroidah, Eva Nur; Carina, Annisa; Oktaviastuti, Blima
Rekayasa Sipil Vol. 20 No. 1 (2026): Rekayasa Sipil Vol. 20 No. 1
Publisher : Department of Civil Engineering, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rekayasasipil.2026.020.01.10

Abstract

The increasing demand for efficient construction materials has driven the popularity of lightweight bricks in the last decade. On the other hand, ship repair activities generate sandblasting waste, amounting to 2.5–3 million tons per year, which contains heavy metals and corrosive residues, and is therefore categorized as B3 waste. This study aims to transform sandblasting waste into environmentally friendly partition walls that support earthquake and fire disaster mitigation by formulating lightweight bricks of the Cellular Lightweight Concrete (CLC) type through the modification of foam agents and the substitution of fine aggregates. Initial studies, conducted through interviews at one of the shipyards, revealed an average monthly generation of sandblasting waste of 12,100 kg. This study combines laboratory experiments and a literature review to examine material properties, including gradation, specific gravity, water absorption, and metal content (XRF–TCLP), as well as to evaluate compressive strength, density, and potential applications in earthquake disaster mitigation. The characterization results indicate that the sandblasting waste meets the gradation requirements specified in SNI 03-2834-2000 and passes physical tests according to SNI 03-1970-2008, with heavy metal content (Ba, Zn, Cu) below the threshold set in PP No. 22 of 2021. Lightweight bricks are made with a composition ratio of 1:1 cement and sandblasting waste, and variations in the foam agent range from 5% to 12.5%. The best formula, according to SNI 8640-2018, is obtained at a foam agent content of 5%, resulting in a compressive strength of 7.28 MPa and a density of 1,283.33 kg/m³, which is lighter than concrete blocks and red bricks. From an earthquake mitigation perspective, it was found that lighter material weight contributed to reducing inertial forces and loads on the structure, thereby enhancing resistance to initial collapse and facilitating ease of dismantling during post-earthquake evacuation. These findings indicate that sandblasting waste has the potential to be processed into environmentally friendly alternative construction materials that not only meet technical standards but also contribute to earthquake risk mitigation strategies.
DESIGN OF A SANDBLASTING WASTE SIEVE MACHINE (CASE STUDY OF SHIPYARD) Indrawan, Rizal; Utomo, Alfarell Akbar Pradhana; Fajardini, Ridhani Anita; Bisono, Fipka; Setiawan, Tri Andi; Purnomo, Dhika Aditya; Rosalina, Amanda; Primaningtyas, Widya Emilia
TURBO [Tulisan Riset Berbasis Online] Vol 14, No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4559

Abstract

At the shipyard, the sandblasting process is routinely carried out to clean material surfaces from rust and other contaminants. This process produces waste in the form of used sand mixed with metal fragments and other debris, requiring separation before the waste can be reused as a concrete mixture. Currently, the separation process is still performed manually, which is considered inefficient due to the large volume of waste, averaging 42 tons per day. To address this issue, the author designed a sandblasting waste sieving machine to make the separation process more automatic and effective. The structural design and strength analysis were carried out using Autodesk Fusion 360 software. The simulation results of the selected design concept showed a minimum safety factor of 6.51, a maximum von Mises stress of 38.134 MPa on the main frame, and a maximum displacement of 0.186 mm on the sieve holder. The design has an estimated total manufacturing cost of Rp4.244.000,-.  
Study of the Mechanical Properties of Ship Cleats Fabricated from Recycled High-Density Polyethylene Nisazarifa, Adristi; Rosalina, Amanda; Nursyifaulkhair, Desrilia; Wibawa, I Putu Arta; Saputra, Muhammad Rizki Andika
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 9 No. 2 (2025): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v9i2.29556

Abstract

High-Density Polyethylene (HDPE), known for its high resistance to chemicals and impact, as well as its low carbon emission production process. However, the high production of HDPE plastic waste poses a significant challenge in the maritime world. This study focuses on efforts to recycle HDPE waste generated from the shipbuilding process at the Non-Metal Workshop of the Surabaya State Shipping Polytechnic (PPNS). This HDPE waste has great potential to be processed into ship components, including cleats. Cleats are essential devices on ships that function to tie ropes. HDPE waste is molded into new sheets using the Hot Press Compression Molding method, followed by tensile and bending tests. These values will be compared with the mechanical properties of virgin HDPE and simulated using ANSYS software to evaluate the cleat's resistance to tensile loads of 470 N, 600 N, and 730 N. Simulations show that the cleat can withstand loads of 470 N and 600 N, but fails plastically under a load of 730 N, with the stress exceeding its yield strength. The results of this study are expected to contribute to the development of more sustainable shipbuilding technology and encourage the development of other recycled products in the maritime industry.
Implementasi Pengomposan secara Aerobik sebagai Solusi Pengelolaan Sampah Organik di RT 012 RW 008 Perumahan Sutorejo Indah Surabaya Rosalina, Amanda; Rismawati, Ria; Sholihah, Mar’atus; Aprilia Sari, Nur Fajar; Gastriani, Ovi Prina; Fajardini, Ridhani Anita
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 4 (2025): Edisi Oktober - Desember
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Sampah rumah tangga, terutama sisa makanan dan tumbuhan, menjadi salah satu penyumbang utama pencemaran lingkungan akibat kurangnya pemahaman masyarakat dalam pengelolaannya. Kegiatan pengabdian masyarakat ini bertujuan meningkatkan pengetahuan warga tentang pengelolaan sampah organik melalui pembuatan kompos secara aerobik dari limbah rumah tangga. Metode yang digunakan meliputi sosialisasi, demonstrasi pembuatan kompos, dan pengamatan proses pengomposan selama 40 hari. Penelitian ini menerapkan desain quasi-eksperimental dengan pendekatan one group pre-test dan post-test, dan data dianalisis menggunakan uji t berpasangan (paired sample T-test) dengan software Minitab untuk mengukur perubahan tingkat pemahaman. Hasil menunjukkan adanya peningkatan signifikan antara nilai pre-test dan post-test, yang menandakan kegiatan ini berhasil meningkatkan pengetahuan masyarakat dalam mengolah sampah organik menjadi kompos serta mendorong perilaku ramah lingkungan di tingkat rumah tangga.
Co-Authors Annisa Carina, Annisa Aprilia Sari, Nur Fajar Auliyasari, Inshiro Blima Oktaviastuti, Blima Cahyono, Luqman Denny Dermawan Dika Rahayu Widiana Fajardini, Ridhani Anita Fipka Bisono Gastriani, Ovi Prina Indrawan, Rizal Luqman Cahyono M. Rizal Fahmi Maret’atus Sholihah Muhammad Akbar Febianto Nisazarifa, Adristi Nisazarifa, Adristi Nur Fajar Aprilia Sari Nursyifaulkhair, Desrilia Nursyifaulkhair, Desrilia Ovi Prina Gastriani Pratiwi, Wiwik Dwi Primaningtyas, Widya Emilia Purnomo, Dhika Aditya Ria Rismawati Ridhani Anita Fajardini Rismawati, Ria Saputra, Muhammad Rizki Andika Sari, Nur Fajar Aprilia Sholihah, Mar'atus Sholihah, Mar’atus Suroidah, Eva Nur Tri Andi Setiawan Utomo, Agung Prasetyo Utomo, Alfarell Akbar Pradhana Wibawa, I Putu Arta Wiwik Dwi Pratiwi, Wiwik Dwi