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All Journal Bandar: Journal of Civil Engineering Jurnal Sipil Terapan
Irma Ridhayani
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Civil Engineering, Building, Construction & Architecture Engineering

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Kinerja Mortar dengan Substitusi Abu Sekam Padi sebagai Bahan Pozzolanan Ummu Kalsum Basman; Irma Ridhayani; Sainuddin Sainuddin; Abdi Manaf; Apriansyah Apriansyah; Muh Diah Fatur Ulhaq
Jurnal Sipil Terapan Vol. 3 No. 1 (2025): Mei: Jurnal Sipil Terapan
Publisher : Fakultas Teknik Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58169/jusit.v3i1.746

Abstract

Rice husk ash (RHA) is an agricultural waste rich in silica with potential as a partial cement substitute in mortar to support sustainable construction. This study evaluates the effect of varying RHA content on the compressive strength and porosity of mortar at 28 and 240 days of age. Mortar was prepared with RHA substitutions of 0%, 10%, 20%, and 30% by cement weight. Compressive strength was tested according to SK SNI 03-2834-2000, while porosity testing followed ASTM C642 standard. The results showed that 20% RHA substitution provided high compressive strength with acceptable porosity. In contrast, 30% RHA significantly increased porosity and sharply reduced compressive strength. These findings suggest that using RHA in the range of 10–20% can improve material efficiency without compromising mechanical performance. The study supports the development of environmentally friendly construction materials through the optimal use of agricultural waste.
Numerical Investigation of Soft Ground Improvement beneath Road Embankments Using Prefabricated Vertical Drains: Insights from PLAXIS 2D Modeling Muh Miftahulkhair; Irma Ridhayani; Nur Okviyani; Herni Suryani; Ellyyni Dwi Fortuna
BANDAR: JOURNAL OF CIVIL ENGINEERING Vol. 7 No. 2 (2025): Bandar: Journal of Civil Engineering
Publisher : Universitas Sulawesi Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31605/bjce.v7i2.5738

Abstract

Abstract Soft clay deposits often cause excessive settlement and instability in road embankments. This study investigates ground improvement using prefabricated vertical drains under staged embankment loading through finite element modeling in PLAXIS 2D. The analysis examines consolidation rate, settlement, pore water pressure dissipation, and safety performance for square and triangular drain layouts with spacings of 1.25 m and 1.50 m. Results show that vertical drains accelerate consolidation, reducing the time to reach 90 percent settlement from 8.3 years to less than 3 years, while improving overall embankment stability. The triangular 1.25 m configuration produced the most uniform deformation and fastest consolidation response. The study confirms that optimized drain geometry significantly enhances soft ground performance and provides a practical numerical framework for design applications in tropical regions.
Co-Authors . Apriansyah Abdi Manaf Ellyyni Dwi Fortuna Herni Suryani Muh Diah Fatur Ulhaq Muh Miftahulkhair Okviyani, Nur Sainuddin, Sainuddin Ummu Kalsum Basman