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Rudy Febrijanto
Institut Teknologi Garut
Civil Engineering, Building, Construction & Architecture

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Studi Efektivitas Penambahan Cangkang Kemiri dan Superlasticizer pada Sifat Mekanik Beton Ayi Dahlan; Dendi Yogaswara; Rudy Febrijanto
Jurnal Konstruksi Vol 21 No 2 (2023): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.21-2.1415

Abstract

Candlenut shells are hard and light, so there is potential to obtain a lighter weight concrete structure but of greater quality by partially replacing it or adding coarse aggregate with candlenut shells. In this research, candlenut shells were used as a substitute for coarse aggregate in the concrete mixture. The aim of this research is to determine the mechanical properties (compressive strength, split tensile strength and deflection strength) of concrete with the addition of candlenut shells and superplasticizer. The method used in this research is a quantitative method. The amount of candlenut shell material used is a substitution for the volume of coarse aggregate of 15%, 30% and 45%. There were two types of samples made in this research, including cylindrical samples with a diameter of 15 cm, height 30 cm, and blocks with dimensions of 10 cm x 15 cm x 60 cm. These samples were made for testing the compressive strength of concrete, splitting tensile strength of concrete and deflection strength of concrete. Concrete with the substitute material for candlenut shells is expected to achieve the planned compressive strength target of 20 MPa. Based on the test results for compressive strength, split tensile strength and concrete deflection strength, the average value for each variation was obtained. Mixture 1 (0%) has an average compressive strength value of 25.68 MPa, an average split tensile strength of 2.11 MPa, deflection strength of 2.85 MPa. Mixture 2 (15%) has a compressive strength of 20.28 MPa, split tensile strength of 1.55 MPa, deflection strength of 1.49 MPa. Mixture 3 (30%) has a compressive strength value of 16.64 MPa, split tensile strength 1.41 MPa, deflection strength 1.24 MPa and for Mixture 4 (45%) the compressive strength value is 12.96 MPa, split tensile strength 1.25 MPa, deflection strength 1.00 MPa.
Analisis Stabilitas Dinding Penahan Tanah Tipe Kantilever, Gravitasi, dan Sheet Pile Rudy Febrijanto; Athaya Zhafirah; Aam Rohadatul Aisy A
Jurnal Konstruksi Vol 22 No 2 (2024): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.22-2.1631

Abstract

Permukaan bumi memiliki bentuk yang tidak rata atau membentuk kemiringan sehingga terjadi perbedaan elevasi muka tanah. Perbedaan elevasi muka tanah memiliki potensi terjadinya longsor. Dinding penahan tanah menjadi salah satu alternatif untuk mengatasi longsor. Tujuan dari penelitian ini menghasilkan desain dinding penahan tanah untuk menangani permasalahan longsor yang terjadi di Ruas Jalan Singajaya-Toblong (Blok Liang Kerud). Metode penelitian yang digunakan adalah analisis kestabilan dinding penahan tanah dengan metode rankine dan metode elemen hingga. Jenis dinding penahan tanah yang dipakai dalam penelitian ini antara lain, tipe gravitasi, kantilever, dan sheet pile. Hasil penelitian menunjukkan bahwa desain dinding penahan tanah tipe kantilever tidak aman karena nilai stabilitas geser yang tidak memenuhi persyaratan yaitu 0,742 < 1,5. Hasil analisis dinding penahan tanah tipe gravitasi paling aman terhadap kestabilan tanah dilihat dari nilai faktor keamanan 1,53 > 1,5; nilai stabilitas guling 2 ≥ 2; dan nilai stabilitas geser 4,642 > 1,5. Sementara itu, tipe sheet pile yang memperhitungkan seberapa panjang material baja yang dibutuhkan tetap tidak bisa menahan tanah. Kesimpulan penelitian ini menunjukkan bahwa dinding penahan tanah yang paling aman yaitu tipe gravitasi yang memiliki nilai faktor aman terhadap stabilitas guling dan stabilitas geser yang melebihi persyaratan kestabilan tanah.
Sifat Fisis Tanah Lempung dengan Penambahan Limbah Serbuk Kulit Kopi Athaya Zhafirah; Hikmatul Fadilah; Madi Hermadi; Rudy Febrijanto
Jurnal Konstruksi Vol 23 No 1 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-1.1932

Abstract

Coffee skin waste is waste obtained from the coffee fruit management process. Piling up coffee skin waste can pollute the environment, but it contains cellulose that can absorb water. This research aims to analyze the effect of the addition of coffee skin powder waste on the physical properties of clay soil in order to improve its quality as a construction and geotechnical material. The research method used experimental tests on the physical properties of clay soil, including moisture content, sieve analysis, content weight, specific gravity, and Atterberg limits. The variation of the addition of coffee skin powder waste was 0%, 10%, 20%, 30%, 40%, and 50% of the soil weight. The results showed that the addition of coffee husk waste caused a decrease in moisture content from 64% to 44.89%, content weight from 1.185 grams/cm3 to 0.677 grams/cm3, and soil specific gravity from 2.6 to 2.28. The plasticity index value also decreased from 26.68 to 18.15, indicating an improvement in soil characteristics. In addition, the proportion of fine grains decreased, while coarse grains increased based on sieve analysis. These results are useful in the geotechnical field to improve soil stability and reduce its plasticity, and in the construction field to improve the bearing capacity of subgrade soils, so they have the potential to be applied in various civil and environmental engineering projects.
Desain Dinding Penahan Tanah pada Lereng Tidak Stabil Berbasis Analisis Numerik Athaya Zhafirah; Rudy Febrijanto; Arby Muhyi Munawar
Jurnal Konstruksi Vol 23 No 2 (2025): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.23-2.2853

Abstract

A landslide occurred in Pananjung Village, Pamulihan District, Garut Regency, blocking the main road access in January 2024. The primary causes of slope instability were steep terrain and poor soil conditions. This study aims to analyze slope stability in the landslide area using a cantilever-type retaining wall as reinforcement. The study site is located in Pananjung Village, Pamulihan District, Garut Regency. The Bishop method was employed in the slope stability analysis, based on laboratory test results of the soil’s physical and mechanical properties. The tested parameters included water content, specific gravity, grain size distribution, and direct shear strength. The analysis was conducted both manually and using GeoStudio and Plaxis 2D software. The results indicate that the safety factor (FK) of the natural slope was below the safe threshold (FK < 1.5). After reinforcement with a retaining wall, the FK value increased beyond the safety limit, indicating a stable slope condition. The retaining wall design was developed based on an analysis of acting forces, considering stability against sliding, overturning, and bearing capacity. This study provides a practical contribution to landslide mitigation through a geotechnical approach based on numerical analysis. The findings can also serve as a technical reference for landslide risk mitigation in disaster-prone areas, offering a technical foundation for slope stabilization through the design of retaining walls grounded in numerical analysis.
Karakteristik Fisis Tanah dengan Penambahan Serbuk Eceng Gondok Ardhiya Rachmala Zedi; Athaya Zhafirah; Rudy Febrijanto
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2257

Abstract

The population of water hyacinth in Situ Bagendit has grown rapidly, causing ecological impacts, including the coverage of the water surface that leads to a decline in aquatic ecosystem quality. On the other hand, dried water hyacinth contains compounds such as cellulose, lignin, and silica, which have potential for use as soil stabilization material. This study aims to evaluate the effect of adding water hyacinth powder on the physical properties of clay soil with mixture variations of 0%, 3%, 6%, and 9% by weight of the original soil. The experimental method includes water content testing, sieve analysis, liquid limit, plastic limit, shrinkage limit, specific gravity, bulk density, and compaction tests, all conducted at the Laboratory of the Garut Institute of Technology. The results show that the addition of water hyacinth powder causes significant changes in the physical properties of clay soil, with the most optimal effect occurring at the 9% mixture. Practically, these findings indicate that water hyacinth powder has the potential to be used as an environmentally friendly additive to improve subgrade soil characteristics, particularly for light construction applications and foundation improvement.
Analisis Pengaruh Penambahan Geogrid pada Stabilitas Dinding Penahan Tanah GSRW (Geoforce Segmental Retaining Wall) Moch Wilman Abdillah; Athaya Zhafirah; Rudy Febrijanto
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2315

Abstract

The construction of the Amphitheater at POLMAN Majalengka Campus 2 employed a Geoforce Segmental Retaining Wall (GSRW) structure on a slope area with unstable subsoil conditions dominated by clay shale, which is prone to weathering and reduced shear strength. Field investigations revealed cracks at the top of the slope during construction, indicating the need for a stability evaluation of the structure. This study aims to calculate and analyze the effect of geogrid reinforcement on the safety factor, deformation, and settlement of the GSRW structure through numerical simulations using Plaxis 2D. The simulations applied a Mohr-Coulomb soil model with geogrid installed at each concrete panel layer, while seismic loads were analyzed pseudostatically using the Mononobe–Okabe method with horizontal (kh) and vertical (kv) acceleration coefficients of 0.18g and 0.036g, respectively. The analysis results showed that GSRW without geogrid had a safety factor of 1.30, which is the minimum stability threshold according to SNI 8460:2017. With geogrid reinforcement, the safety factor increased to 1.82. Maximum deformation decreased from 0.25 m to 0.14 m (a 41% reduction), and settlement decreased from 5.2 cm in 38 days to 3 cm in 64 days. This study demonstrates that geogrid reinforcement significantly improves the performance of GSRW, making it highly recommended for weak soil conditions such as clay shale.
Optimalisasi Penggunaan Alat Berat dalam Pekerjaan Timbunan Jalan Tol Patimban Paket 02 Athaya Zhafirah; Algi Muhaemin; Rudy Febrijanto; Madi Hermadi
Jurnal Konstruksi Vol 24 No 1 (2026): Jurnal Konstruksi
Publisher : Institut Teknologi Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33364/konstruksi/v.24-1.2984

Abstract

The Patimban Toll Road Project Package 02 at STA 21+800–23+600 is part of a National Strategic Project (PSN) that requires high efficiency, particularly in large-volume embankment works. This study aims to analyze the productivity of heavy equipment used in embankment operations in order to determine an optimal equipment utilization plan in terms of time and cost. The scientific contribution of this research lies in the development of an approach for planning the number of equipment units based on actual field productivity combined with operational cost analysis, which can serve as a reference for heavy equipment management in large-scale infrastructure projects. The results show that a combination of 6 units of Komatsu PC200 excavators, 38 units of Isuzu dump trucks, 6 units of Zomlion ZD170G bulldozers, 5 units of sheep foot rollers, and 5 units of vibratory rollers is capable of completing an embankment volume of 372,714 m³ within 90 working days, with a total rental cost of IDR 191,644,520 per day.
Co-Authors Aam Rohadatul Aisy A Algi Muhaemin Arby Muhyi Munawar Ardhiya Rachmala Zedi Ayi Dahlan Dendi Yogaswara Hikmatul Fadilah Madi Hermadi Moch Wilman Abdillah