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All Journal Nusantara Civil Engineering Journal
Fatmawati Fatmawati
Balikpapan State Polytechnic
Civil Engineering, Building, Construction & Architecture

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Pengaruh Jumlah Tumbukan Pada Campuran AC-WC Terhadap Nilai Marshall Ridho Hafidz; Fatmawati Fatmawati; Sara Wibawaning Respati
Nusantara Civil Engineering Journal Vol 3 No 2 (2024): 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.v3i2.644

Abstract

Asphalt Concrete Wearing Course (AC-WC) is the surface layer of flexible pavement that directly bears traffic loads and provides driving comfort. This study aims to analyze the effect of varying the number of compaction blows on the Marshall characteristics of AC-WC mixtures and to determine the optimal number of blows according to applicable specifications. The testing methodology adhered to SNI 06-2489-1991 and the Bina Marga Specification 2018 Revision 2, which included comprehensive material testing and Marshall testing for Stability, Flow, Voids in the Mix (VIM), Voids in Mineral Aggregate (VMA), and Voids Filled with Bitumen (VFB). The results indicate that increasing the number of blows from 2x50 to 2x85 significantly impacts the mixture's properties. Stability, VFB, and Marshall Quotient values increased with more blows, while Flow, VIM, and VMA decreased. Average Stability rose from 802.2 kg (2x50 blows) to 2657.1 kg (2x85 blows). Conversely, average Flow decreased from 6.5 mm to 2.5 mm, VIM from 9.0% to 1.3%, and VMA from 19.3% to 12.5%. Based on the analysis of all Marshall criteria, the 2x80 blows treatment was identified as the most optimal. At this level, the mixture achieved an ideal balance between strength (Stability of 2214.3 kg) and flexibility (Flow of 3.0 mm) while meeting all specification requirements. This study concludes that compaction effort is crucial for performance and recommends 2x80 blows to produce a superior AC-WC mixture for preventive maintenance purposes.
Flexural Performance of Concrete with Modified Eucalyptus Bark Waste as Partial Replacement of Fine Aggregate Azzan Farizi; Anis Aulia Ulfa; Fatmawati Fatmawati
Nusantara Civil Engineering Journal Vol 4 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.
Co-Authors Anis Aulia Ulfa Azzan Farizi Ridho Hafidz Sara Wibawaning Respati