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All Journal Teknosains: Media Informasi Sains dan Teknologi Mattawang: Jurnal Pengabdian Masyarakat PENGABDI: Jurnal Hasil Pengabdian Masyarakat Journal of the Civil Engineering Forum Jurnal Flyover Jurnal Teknik Sipil Macca Vokatek : Jurnal Pengabdian Masyarakat Seminar Nasional Hasil Penelitian LP2M UNM International Journal of Environment, Engineering, and Education Jurnal Sipakatau sCEj– : Sustainable Civil Engineering Journal
Mohammad Junaedy Rahman, Mohammad Junaedy
Program Studi Pascasarjana Teknik Sipil, Fakultas Teknik Sipil dan Lingkungan - Institut Teknologi Bandung Jl. Ganesa No.10 Bandung.
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Journal : Journal of the Civil Engineering Forum

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An Assessment of Derelict Building Constructions Situated In Coastal Regions Rahman, Mohammad Junaedy; Hasrul, Muhammad Reza; Ashad, Hanafi; Yusuf, Furqan Ali; Hasrul, Nur Refera
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.10433

Abstract

Reinforced concrete structures constructed in coastal areas in Indonesia often suffer damage before reaching their intended service life, with steel reinforcement corrosion being a major contributing factor. This study aims to investigate the use of concrete structures produced with simple methods and inadequate supervision in coastal regions. Reinforced concrete structures near the coast are susceptible to carbonation due to marine environmental factors, leading to reinforcement corrosion. The study was conducted on the Dande Dandere Market building, Tanakeke Island, Takalar Regency, South Sulawesi. The research method employed quantitative techniques, including surveys and structural testing. Visual inspections were conducted to identify the types of damage present in the building and estimate their causes. Structural testing involved both destructive and non-destructive tests. Concrete compressive strength testing was also conducted to assess the concrete sample’s compressive strength, along with carbonation testing to determine the acidity level of concrete due to the intrusion of salt compounds or carbonation formed within the concrete mass. The research findings indicate structural degradation in the market’s construction, occurring more rapidly than the intended lifespan of the building. Signs of structural degradation in the reinforced concrete construction include spalling of concrete cover on beams, supporting columns, and cantileverslabs, as well as degraded reinforcement, with an average reduction in steel weight of 62.70% over six years, and an average weight loss of 0.103 grams per day. Therefore, efforts are needed to optimize the structural quality of the building through comprehensive repairs, starting from the foundation. However, for cost-efficient alternatives, it is recommended to use timber structural materials for new market construction. The use of timber in coastal buildings, which are vulnerable to marine influences, is more feasible as the presence of saltwater can inhibit wood decay caused by microorganisms.
Sustainable Lightweight Concrete Using Candlenut Shell as Coarse Aggregate: The Impact of Water-Cement Ratios on Strength and Density Hasrul, Muhammad Reza; Rahman, Mohammad Junaedy; Helmy, Ahnaf Riyandirga Ariyansyah Putra; Natsir, Taufiq; Asrib, Ahmad Rifqi
Journal of the Civil Engineering Forum Vol. 11 No. 3 (September 2025)
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.18175

Abstract

This study explores the promising potential of Candlenut Shell Aggregate (CSA) as a sustainable and innovative alternative for lightweight concrete production. Derived from Aleurites moluccanus, CSA is an agricultural by-product characterized by its low density, moderate abrasion resistance, and high water absorption make it suitable for non-structural applications like wall panels and flooring. However, integrating CSA into concrete mixes requires careful management of the water-cement (w/c) ratio which significantly affects compressive strength, density, and workability. Concrete mixes were prepared using the absolute volume method, with w/c ratios ranging from 0.65 to 0.30, to identify the optimal balance. The absolute volume principle was applied for all mix designs. Our results indicate that an optimal w/c ratio of 0.55 yields the most favorable balance, achieving the highest compressive strength of 14.3 MPa and a maximum density of approximately 1850 kg/m3. This specific ratio strikes an ideal equilibrium between adequate cement hydration and effective void minimization within the concrete matrix. Conversely, higher w/c ratios lead to increased porosity, diminishing both strength and density, while lower ratios impair workability, hindering compaction and hydration, ultimately degrading performance. These findings resonate strongly with existing prior research, further emphasizing the crucial need for pre-treatment of CSA, such as soaking or the strategic incorporation of admixtures, to effectively mitigate its inherent high absorption and enhance overall mix performance. In conclusion, this study robustly confirms the feasibility of utilizing CSA as a lightweight aggregate. This represents a significant step towards developing an eco-friendly solution that not only contributes to global sustainability goals by repurposing agricultural waste but also actively reduces reliance on conventional, resource-intensive aggregates. Future research should explore the long-term durability of CSA-based concrete and investigate advanced admixtures to further enhance its properties for broader applications.
Co-Authors Afiah, Indah Nur Ahmad Rifqi Asrib Ahmad Wahidiyat Haedar Ahsan, Muhammad Andriadi, Andi Muhammad Rezky Andriady, Andi Muhammad Rezky Ardiyanti, Riska Asnur, Moeh. Kay Muddin BP, Muh Syarif Chatarina Umbul Wahyuni Cheng, Aw Yoke Dwiasta, Andi Yusdy Fahrul, Muhammad Hanafi Ashad Hasrul, Nur Refera Hasrul, Reza Helmy, Ahnaf Riyandirga Ariyansyah Putra Iriandy Iriandy Kurniawan, Ryan Dimas Mahmuda, Ali Fauzi Maming, Muhammad Idhil Mappangara, Surianto B. Moeh. Kay Muddin Asnur Muhammad, Ahmad Fauzan Natsir, Taufiq Nurafni Oktaviyah Pareang, Alias Riyandirga Ariyansyah Putra Helmy, Ahnaf Saraswati, Rizki Ayu Tumaadir, Andi Butsainah Yusuf , Furqan Ali Yusuf, Furqan Ali