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All Journal INERSIA Jurnal Pengabdian kepada Masyarakat Multidisiplin (JUPENGEN) Innovative Research in Civil and Environmental Engineering (IRCEE)
Bimawijaya Laia
Public Works And Spatial Planning Office Gunungsitoli City
Religion Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Materials Science & Nanotechnology Neuroscience Transportation

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PENGARUH KERAPATAN TANAH PASIR KALI OPAK PLERET YOGYAKARTA TERHADAP POTENSI LIKUIFAKSI BERDASARKAN UJI SHAKING TABLE Laia, Bimawijaya
JURNAL INERSIA Vol. 7 No. 1 (2015): Jurnal Inersia
Publisher : POLITEKNIK NEGERI SAMARINDA

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Abstract

Likuifaksi adalah suatu peristiwa berubahnya sifat tanah dari keadaan padat menjadi keadaan cair, yang disebabkan oleh beban siklik pada saat gempa terjadi sehingga tekanan air pori meningkat melebihi tegangan efektif tanah. Likuifaksi umumnya terjadi di lapisan sedimen granular dengan tingkat kerapatan rendah. Pengaruh kerapatan relatif tanah terhadap mekanisme likuifaksi dapat diketahui dengan melakukan uji eksperimental menggunakan shaking table. Parameter yang digunakan untuk menentukan tanah yang mengalami likuifaksi adalah rasio peningkatan tegangan air pori (ru). Jika ru ≥ 1 maka likuifaksi dapat terjadi, sedangkan jika ru < 1 maka likuifaksi tidak dapat terjadi. Tanah pasir Kali Opak Pleret yang digunakan sebagai objek dalam penelitian memiliki kerapatan sebesar 24,35%. Hasil evaluasi uji shaking table menunjukkan bahwa potensi likuifaksi terbesar terjadi pada kerapatan relatif tanah 25% untuk percepatan gempa 0,4g dan terendah tercatat pada kerapatan relatif tanah 55% untuk percepatan gempa 0,3g. Penurunan muka tanah terbesar terjadi pada kerapatan relatif 25% yakni 4 cm dan terendah pada kerapatan 55% sebesar 0,53 cm. Pengujian ini menunjukkan bahwa pada tanah pasir Kali Opak Pleret dengan kerapatan relatif tanah 25% dan 35% berpotensi likuifaksi, dan pada kerapatan relatif tanah 45% dan 55% tidak berpotensi likuifaksi.
The Influence Of Using Sea Sand As Aggregate On The Compressive Strength Of Concrete Dermawan Zebua; Hamedoni Harita; Serta Denius Daeli; Muhammad Haris Zalukhu; Bimawijaya Laia
Innovative Research in Civil and Environmental Engineering Vol. 1 No. 1 (2024): IRCEE - October
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/ircee.v1i1.41

Abstract

This study investigates the effect of using sea sand as fine aggregate on the compressive strength of concrete. The experimental research involved preparing concrete samples with varying proportions of sea sand, comparing their performance against conventional river sand. Compressive strength tests were conducted on the samples at 14 days, revealing that samples containing river sand exhibited significantly higher compressive strength than those with sea sand. The average compressive strength for concrete with 100% river sand was found to be 18.23 N/mm², while the presence of chlorides in sea sand, despite washing, adversely affected the strength. Statistical analysis confirmed a significant difference in strength between the control and sea sand mixtures. While sea sand presents an environmentally sustainable alternative, particularly in coastal regions, its use requires careful consideration of chloride content to prevent corrosion of steel reinforcement. This study concludes that sea sand can be a viable option for non-load-bearing or temporary structures, provided that appropriate measures are taken to mitigate potential risks.
Strategi Peningkatan Keterampilan Pertukangan Kayu Sebagai Upaya Pemberdayaan Ekonomi Masyarakat Desa Mudik Zebua, Dermawan; Harita, Hamedoni; Laia, Bimawijaya; Zalukhu, Muhammad Haris; Daeli, Serta Denius; Daeli, Ikhtiar Aronifati; Giawa, Jun Fajar Krisman; Mendrofa, Kevin Berkat; Zebua, Friski Dermawan; Mendrofa, Rifki Wahyudi; Daeli, Jefri Rahmat
Jurnal Pengabdian Kepada Masyarakat Multi Disiplin Vol. 2 No. 3 (2025): JUPENGEN - Agustus
Publisher : CV. SINAR HOWUHOWU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70134/jupengen.v2i3.728

Abstract

The carpentry training program in Mudik Village aims to improve the technical and entrepreneurial skills of the community as part of local economic empowerment efforts. The three-day training program utilizes a combination of theory and practice. The first day focused on theoretical material, including an introduction to wood types, equipment usage, measurement techniques, occupational safety principles, and entrepreneurial fundamentals. The second and third days focused on hands-on practice in making simple products, such as bookshelves, covering the measuring, cutting, assembly, and finishing processes. Evaluation results showed significant skill improvements across all aspects, with the greatest improvement in the ability to use modern tools (+64%). Furthermore, participants demonstrated increased awareness of occupational safety and understanding of product marketing strategies. This training demonstrated that the three-day, integrative approach can improve skills while motivating the community to develop carpentry businesses. Future recommendations include further training, business mentoring, and the formation of village business groups to support the program's sustainability.
Co-Authors Daeli, Jefri Rahmat Dermawan Zebua Giawa, Jun Fajar Krisman Harita, Hamedoni Ikhtiar Aronifati Daeli Mendrofa, Kevin Berkat Mendrofa, Rifki Wahyudi Muhammad Haris Zalukhu Serta Denius Daeli Zebua, Friski Dermawan