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All Journal Jurnal Pendidikan Teknologi dan Kejuruan CIVED (Journal of Civil Engineering and Vocational Education) Jukung (Jurnal Teknik Lingkungan) Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri Teknomekanik Jurnal Applied Science in Civil Engineering Jurnal Aerasi Journal of Engineering Researcher and Lecturer International Journal of Environment, Engineering, and Education Journal of Civil Engineering and Vocational Education Jurnal Keilmuan dan Aplikasi Teknologi Industri
Yaumal Arbi
Teknik Sipil Universitas Negeri Padang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Journal : teknomekanik

 1 
Durability performances of ferronickel slag aggregate and seawater concrete Sandra, Nevy; Caronge, Muhammad Akbar; Sunaryati, Jati; Kawaai, Keiyu; Nsama, Willick; Arbi, Yaumal; Arifin, Ari Syaiful Rahman
Teknomekanik Vol. 8 No. 1 (2025): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v8i1.34572

Abstract

The rising demand for concrete in the building sector has resulted in the exhaustion of natural sand and freshwater supplies, leading to the pursuit of sustainable substitutes. Coastal areas have plentiful ferronickel slag (SL) and seawater (SW), which can be used to manufacture concrete. Nevertheless, the possibility of corrosion to steel reinforcement raises concerns that require further research. This investigation examines the mechanical and durability performance of concrete that incorporates SL as a partial replacement for fine aggregate and SW as a mixing component. The objective is to optimize SL content to improve compressive strength, resistance to chloride ions, and overall durability. Experimental results show that replacing 25% of the aggregate with SL yields the best combination of workability, strength, and durability, significantly enhancing compressive strength, decreasing porosity, and lessening chloride ion penetration, as evidenced by the Rapid Chloride Penetration Test (RCPT). Although seawater promotes early-age hydration and strength development, its extended use slightly diminishes compressive strength due to salt-induced micro-cracking. However, SL counters these effects, making SW–SL mixture a feasible and sustainable option for concrete production in coastal and resource-limited areas. A significant relationship between RCPT and compressive strength underscores the important role of SL in densifying the matrix and improving impermeability. The concrete mixture with 25% SL exhibits the lowest abrasion weight loss at 28 and 120 days, showing improved durability. This study highlights the potential of using SL and seawater to create eco-friendly and high-performance concrete for harsh environments.
Spatial modelling of shallow groundwater quality in coastal areas with Kriging interpolation Arbi, Yaumal; Syah, Nurhasan; Umar, Iswandi; Dewata, Indang; Gusman, Mulya; Sandra, Nevy
Teknomekanik Vol. 9 No. 1 (2026): Regular Issue
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/teknomekanik.v9i1.47272

Abstract

This study maps shallow coastal groundwater quality in Padang, Indonesia, using four operational parameters: potential of hydrogen (pH), electrical conductivity (EC), total dissolved solids (TDS), and salinity. We characterize spatial dependence using empirical variograms, evaluate directional anisotropy, and generate prediction surfaces with Ordinary Kriging. The variogram analysis indicates stronger spatial continuity along the coastline for EC and TDS, while salinity shows shorter continuity with a distinct directional structure, reflecting localized freshwater-seawater mixing processes. Groundwater pH remains neutral to slightly alkaline and exhibits lower spatial variability than EC, TDS, and salinity. Leave-one-out cross-validation supports the reliability of the kriging estimates at the study scale, indicating low prediction error and strong agreement between observed and predicted values. The resulting thematic maps enable a three-level quality zoning that differentiates a lower-risk northern segment, a transitional central belt, and a higher-risk southern segment consistent with seawater intrusion influence. These outputs provide a practical basis for prioritizing monitoring locations, protecting vulnerable wells, and strengthening evidence-based coastal groundwater management aligned with SDG 6 Clean Water and Sanitation and SDG 11 Sustainable Cities and Communities.
Co-Authors Ade Prima Rizki Adfuza, Gloria Poppy Akmal, Ikhsanul Al-Saffar, Zaid Hazim Aldri Frinaldi Amri, Zainul Andi Irawan Ari Syaiful Arifin Ashadi Rizki Zumaro Bunyamin Bunyamin Bunyamin Bunyamin Caronge, Muhammad Akbar Chalik, Adrian Chandra, Arief Dasman Lanin Devi Rofiani Eka Prihandana Eka Rahmatul Aidha Eltika, Rifa Faisal Ashar Fajri, Gilang Dwi Febri Prasetya Fitra Rifwan Fitrianti, Rahma Giatman, M Hapzi Ali Haq, Syaiful Hendri Sawir, Hendri Herza, Habil Abdilah Iing Surya Marlis Indang Dewata Intan Purnama Sari Irfan, Fadhil islami, Zaidina Resvita Ivena, Jevon Ona Jati Sunaryati Jaya, Ramadhansyah Putra Jimmy Vernando Kawaai, Keiyu Khairuni Delfi Anisa Linda Deflianti Mardizal, Jonni Maulana, Majid Mhd. Handal Hamdallah Mirshad, Emilham Mithfan Fadhli Muhammad Irsad Mulya Gusman Mulyani, Yusni Nabawi, Rahmat Azis Nevy Sandra Nidal Zuwida Nisa Ardaneri Nizwardi Jalinus Nofriya Nofriya, Nofriya Novirman Jamarun Nsama, Willick Ona Pebiani Patriotika, Fithriyah Pranagung, Muhamad Iqbal Putri, Widia Rahayu, Shinta Rahman Arifin, Ari Syaiful Ramadhansyah Putra Jaya Ramadhianty, Rumia Rani, Thania Mustika Rembrandt, Rembrandt Riko Fernando Putra Rinda Dwi Utari Rizki Aziz Ronald Leonardo Siregar Salma Rahmadita Sani, Wan Noor Hin Mior sri yanti lisha Sri Yanti Lisha Sumbara, Bagas Surenda, Rian Syahril Syahril Syahril Syahril Taufiq Ihsan Totoh Andayono Tri Padmi Damanhuri Umar, Genius Umar, Iswandi Utama, Rizky Indra Vina Lestari Riyandini, Vina Lestari Wan Noor Hin Mior Sani Weni Jumadi Windi Shintia Aneva Yandra, Muvi Yendri, Farhan Yonita, Wulan Alfi Yusmar, Fajri Zaid Hazim Al-Saffar