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All Journal Journal of the Civil Engineering Forum Jurnal Talenta Sipil
I Nyoman Sutarja
Jurusan Teknik Sipil Fakultas Teknik Universitas Udayana
Civil Engineering, Building, Construction & Architecture Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Manajemen Risiko Kesehatan, Keselamatan, Kerja dan Lingkungan (K3L) pada Proyek Pembangunan Embung Tukad Unda Provinsi Bali Suryawan, M. Alit; Sutarja, I Nyoman; Pariartha, I Putu Gustave Suryantara
Jurnal Talenta Sipil Vol 8, No 2 (2025): Agustus
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v8i2.982

Abstract

The construction work of the Tukad Unda Reservoir is located in a former sand quarry area characterized by water-filled pits and unstable coral aggregates. This area also serves as a lahar flow path during eruptions of Mount Agung, which remains active. This condition was identified through geological and geotechnical sampling tests. The aim of this study is to analyze the Occupational Health, Safety, and Environment (HSE) risks that can be identified in this project. Data were collected through interviews, brainstorming sessions, and field observations. Risk coefficients were scored based on risk acceptability. The assessment focused on dominant risks that require management actions, specifically those categorized as “high” and “very high” risk levels. The final identification results revealed a total of 75 risks based on the type of work, consisting of 28 risks (37%) in sub-structural work, 41 (55%) in structural activities, and 6 (8%) in architectural activities. Based on the sources of risk, 26 risks (35%) originated from equipment, 27 (36%) from materials, and 22 (29%) from environmental factors. In terms of impact targets, 64 risks (85%) affect humans, 10 (13%) affect both humans and the environment, and 1 (1%) affects the environment alone. Based on the analysis using the AS/NZS 4360:2004 standard, 17 risks (23%) were classified as low risk, 39 (52%) as medium risk, and 19 (25%) as high risk. Risk ownership was predominantly allocated to the contractor's HSE supervisors (56%), followed by site managers (35%) and technical staff (9%). It is recommended that competent and authorized personnel at the project site conduct safety briefings before commencing any work activities to minimize the potential for unwanted incidents. Workers are also advised to pay more attention to occupational health and safety by wearing appropriate personal protective equipment (PPE) and complying with all established regulations and standard operating procedures (SOPs).
Experimental Study on Compressive Strength, Flexural Strength, and Microstructure of Epoxy Mortar as Concrete Repair Mortar Umbu Tay, Bonaventura Haryanto; Sutarja, I Nyoman; Widiarsa, Ida Bagus Rai
Journal of the Civil Engineering Forum Vol. 12 No. 1 (January 2026)
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.23442

Abstract

his study investigates the potential of custom-formulated epoxy-based concrete repair mortar as an alternative material for structural applications. Conventional commercial mortars, while practical, often exhibit limitations in long-term strength and durability. This research evaluates the mechanical and microstructural performance of epoxy mortar using a self-mixed composition consisting of epoxy resin, cornice adhesive, and silica sand. Three variations were developed based on the ratio of epoxy resin to cornice adhesive (50%, 70%, and 100%), and were labeled as RE0.5, RE0.7, and RE1. A commercial epoxy–cement-based mortar, Sikafloor-81 Epocem (SF), was used as a benchmark for comparison. Specimens were prepared in the form of cubes and prisms and tested at curing ages of 7, 14, and 28 days for compressive and flexural strength. Microstructural characteristics were analyzed using X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy (SEM). At 28 days, the compressive strength values were 30.88 MPa for RE0.5, 48.56 MPa for RE0.7, 51.84 MPa for RE1, and 18.00 MPa for SF. Flexural strength results at 28 days reached 25.74 MPa (RE0.5), 31.18 MPa (RE0.7), 32.54 MPa (RE1), and 8.32 MPa (SF). Elemental analysis confirmed that the high silica content in the fine aggregate and the presence of calcium sulfate in the filler contributed to a denser and more rigid matrix. Crystalline phase analysis revealed quartz as the dominant structure, and microstructural observations indicated fewer pores and cracks in RE1 and RE0.7 compared to SF. These results indicate that a carefully optimized epoxy mortar formulation can exceed the performance of commercial products such as SF, offering enhanced mechanical strength and improved microstructural integrity for use in concrete repair.
Co-Authors I PUTU GUSTAVE SURYANTARA PARIARTHA Suryawan, M. Alit Umbu Tay, Bonaventura Haryanto Widiarsa, Ida Bagus Rai