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Febrijanto, Rudy
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Civil Engineering, Building, Construction & Architecture

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Studi Efektivitas Penambahan Cangkang Kemiri dan Superlasticizer pada Sifat Mekanik Beton Dahlan, Ayi; Yogaswara, Dendi; Febrijanto, Rudy
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 Febrijanto, Rudy; Zhafirah, Athaya; Rohadatul Aisy A, Aam
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.
Studi Efektivitas Penambahan Cangkang Kemiri dan Superlasticizer pada Sifat Mekanik Beton Dahlan, Ayi; Yogaswara, Dendi; Febrijanto, Rudy
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.
Sifat Fisis Tanah Lempung dengan Penambahan Limbah Serbuk Kulit Kopi Zhafirah, Athaya; Fadilah, Hikmatul; Hermadi, Madi; Febrijanto, Rudy
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 Zhafirah, Athaya; Febrijanto, Rudy; Munawar, Arby Muhyi
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.
Co-Authors Dahlan, Ayi Fadilah, Hikmatul Madi Hermadi, Madi Munawar, Arby Muhyi Rohadatul Aisy A, Aam Salim, Riyadi Yogaswara, Dendi