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Totok Sulistyo
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Civil Engineering Dept, Balikpapan State Polytechnics Office : Jalan Soekarno-Hatta Km.08 Balikpapan 76126 Telp. (0542)860895, 862305 Fax. 861107 web: sipil.poltekba.ac.id email. admin@ojs.poltekba.ac.id
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INDONESIA
Nusantara Civil Engineering Journal
Published by Politeknik Negeri Balikpapan
ISSN : -     EISSN : 2828612X     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture
Nusantara Civil Engineering Journal is the open-access peer-reviewed journal of civil engineering and environment. This journal is published by the Department of Civil Engineering, Balikpapan State Polytechnics, it has scopes and focuses in: 1. Road & Bridge Construction 2. Transportation System 3. Structure 4. Geotechnics 6. Construction Management 7. Material Technology 8. Hydrology & Environment 9. Hydraulic 10. Architecture & Urban Planning 11. Geomatics, Photogrammetry & GIS
Arjuna Subject : Teknik (semua kategori) - Bangunan dan Konstruksi
Articles 32 Documents
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Flexural Performance of Concrete with Modified Eucalyptus Bark Waste as Partial Replacement of Fine Aggregate Farizi, Azzan; Aulia Ulfa, Anis; Fatmawati, Fatmawati
Nusantara Civil Engineering Journal Vol 3 No 2 (2025): Nusantara Civil Engineering Journal
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v3i2.662

Abstract

The utilization of eucalyptus bark waste as an alternative material in concrete represents an effort to reduce by-products from the forestry industry. However, the organic nature of this material may influence the mechanical performance of concrete. This study investigates the effect of alkali-treated eucalyptus bark waste used as a partial replacement for fine aggregate on the flexural strength of concrete. Prior to mixing, the bark waste was modified through alkaline treatment using a 1% NaOH solution for approximately 24 hours to improve its compatibility with the cement matrix. Replacement levels of 0%, 1%, 2.5%, and 5% by weight of fine aggregate were examined. Concrete beam specimens were tested for flexural strength at 28 days. The results indicate that increasing the proportion of eucalyptus bark waste leads to a reduction in flexural strength. The control mixture (0%) satisfies the flexural strength requirement of K250 concrete based on SNI T-15-1991-03, whereas mixtures containing eucalyptus bark waste fail to meet the minimum criterion. These findings suggest that alkali-treated eucalyptus bark waste is not suitable as a fine aggregate substitute in structural concrete.
The Productivity Analysis of Heavy Equipment Usage in Cut and Fill Work for the IKN Toll Road Construction Project Section 1B, Bandara Sepinggan – Balsam Toll Segment Sulistianto, Dedy; Rus, Tatag Yufitra; Mahfud, Mahfud
Nusantara Civil Engineering Journal Vol 3 No 2 (2025): Nusantara Civil Engineering Journal
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v3i2.664

Abstract

Cut and fill work is a critical initial stage in toll road construction, including the IKN Toll Road Project Section 1B spanning the Bandara Sepinggan – Balsam Toll segment. The effective use of heavy equipment is a key factor influencing the speed and quality of earthwork operations in this project. This study aims to analyze the productivity of excavators, dump trucks, and bulldozers, as well as determine the optimal number of heavy equipment units based on actual operational conditions in the field. A quantitative research method was employed by collecting primary data such as cycle time and equipment efficiency, along with secondary data including equipment capacity and production targets. The results indicate that excavators with bucket capacities of 0.93 m³ and 1.4 m³ have similar productivity levels of approximately 100 m³/hour, requiring nine units each. Dump trucks with capacities of 22 m³ and 10 m³ produce 32.73 m³/hour and 29.03 m³/hour, with required units of 26 and 30, respectively. The bulldozer shows a productivity of 93.2 m³/hour requiring five units. The findings highlight that productivity is influenced not only by equipment capacity but also by cycle time and operational efficiency. The study concludes that planning based on actual field data is crucial for determining the required heavy equipment efficiently and preventing resource inefficiencies.

Page 4 of 4 | Total Record : 32

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