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All Journal Nusantara Civil Engineering Journal
Anis Aulia Ulfa
Balikpapan State Polytechnic
Civil Engineering, Building, Construction & Architecture

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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.
Utilization of Red Brick Demolition Waste as a Substitute for Fine Aggregate in Paving Block Mortar Raja Riono; Sunarno Sunarno; Anis Aulia Ulfa
Nusantara Civil Engineering Journal Vol 5 No 1 (2026): Nusantara Civil Engineering Journal (January - June 2026)
Publisher : Civil Engineering Dept, Balikpapan State Polytechnics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32487/nuce.v4i1.710

Abstract

Paving blocks are construction materials composed of cement, fine aggregate, and water. Continuous use of natural fine aggregates may increase environmental exploitation; therefore, environmentally friendly alternative materials are needed, one of which is red brick demolition waste. This study aimed to determine the effect of red brick waste substitution as fine aggregate on the compressive strength of paving block mortar. The substitution variations used were 0%, 5%, 10%, 15%, and 20% of the fine aggregate weight. Cube specimens measuring 5 cm × 5 cm × 5 cm were prepared with three samples for each variation. Compressive strength tests were conducted at the ages of 7 and 14 days. The results showed that the highest compressive strength was obtained in the normal mixture (0%) with values of 142.75 kg/cm² at 7 days and 183.54 kg/cm² at 14 days. The addition of red brick waste reduced the compressive strength at the 5% variation, but the strength gradually increased up to the 20% variation. The 20% variation produced compressive strengths of 126.44 kg/cm² at 7 days and 127.80 kg/cm² at 14 days. Based on these results, red brick waste has the potential to be used as a partial substitute for fine aggregate in paving block mortar.
Co-Authors Azzan Farizi Fatmawati Fatmawati Raja Riono Sunarno Sunarno