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Eko Walujodjati
Sekolah Tinggi Teknologi Garut
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Transportation

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Pengaruh Limbah Abu Ampas Kopi Garut terhadap Kuat Lentur Beton Marsalina, Sali; Walujodjati, Eko
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.23-1.1805

Abstract

The development of coffee shop businesses in Garut has contributed to the increase in coffee grounds waste, which can pollute the environment. One of the uses of coffee grounds waste is as a substitute for part of the cement in concrete. Coffee grounds ash contains silica which is pozzolanic in concrete. The purpose of this study was to determine the effect of coffee grounds ash as a partial cement substitute on the flexural strength of concrete. The study was conducted using an experimental method using variations of coffee grounds ash of 3%, 6%, and 9% as a partial cement substitute in concrete with a design quality of K-300 (fc’ 25 MPa) and testing at a concrete age of 28 days. Compressive strength testing was carried out on cube test specimens (15 cm x 15 cm x 15 cm) and flexural strength on beams (10 cm x 18 cm x 60 cm), each with 3 samples per variation. The test was guided by SNI 7656:2012. The results showed that increasing the content of coffee grounds ash reduced the strength of concrete. The average compressive strength of normal concrete is 217.72 kg/cm2, decreasing to 198.20 kg/cm2 with a percentage decrease of (8.96%) at a content of 3%, 182.13 kg/cm2 (16.35%) at a content of 6%, and 150.22 kg/cm2 (31.01%) at a content of 9%. This study shows that although coffee grounds ash has the potential as an environmentally friendly material, its use as a partial replacement of cement in concrete with a content of more than 3% actually weakens the mechanical properties of the concrete. Therefore, further research is needed with a lower substitution content or a combination with other additives to improve concrete performance.
Kajian Struktur Terowongan Proyek Bintaro Jaya Xchange Mall Walujodjati, Eko; Fahmi, Muhammad Zaki; Fathir, Mirza
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.23-1.1879

Abstract

The construction of the tunnel structure of this mall project is intended for the construction of a tunnel under the Jakarta-Serpong toll road. This tunnel project has a length of 160 m and was built in 2022. The reason for taking this study was to determine how large the capacity is and prove that the tunnel structure is included in the safe and unsafe category of the structure. This research in this analysis was carried out using a manual calculation method and assisted by Microsoft Excel software to evaluate the structural strength, shear capacity, and moment capacity of the beam and column structures. As for the results of the study for the flexural reinforcement in the beam, the Mn value was obtained as 218370.52 KNm and Mu as 4572.55 kNm indicating that the structure or element has sufficient moment capacity to withstand the applied load. Furthermore, for the shear reinforcement, the Vs value is 1326.524 kN and the Vmax value is 1424.079 kN indicating that the shear force provided by the shear reinforcement (Vs) of 1326.524 kN is still below the maximum shear force that can be withstood by the element (Vsmax) of 1424.079 kN. While for the column structure section on the flexural reinforcement, the Pn value needs to be 481.23 kN and the Pnb value of 4,404.27 kN indicates that the structure has met the safety capacity and for the shear reinforcement, the Vu value is 156.40 kN and the value of 179.93 kN indicates that the structure has met the safety capacity. It can be concluded that the tunnel structure is safe and suitable for use by vehicles.
Analisis Stabilitas Dan Tegangan Bendungan RCC (Rolled-Compacted Concrete) Pada Pembangunan Bendungan Cibeet Walujodjati, Eko; Aprilianti, Mega; Permana, Sulwan
JURNAL TEKNIK SIPIL Vol 14, No 1 (2025): Volume 14 Nomor 1 Mei 2025
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jts.v14i1.40341

Abstract

Bendungan merupakan struktur penting yang berfungsi untuk menyimpan air dan mengatur alirannya sesuai dengan kebutuhan. Mengingat salah satu tujuan dibangunnya Bendungan Cibeet ini adalah untuk dapat mereduksi banjir yang terjadi di hilir sungai Citarum sebesar 66% pada Q25 yaitu 300,33 m3/det, analisis menyeluruh terhadap stabilitas dan tegangan pada tubuh bendungan menjadi langkah krusial dalam proses konstruksi. Penelitian ini bertujuan untuk menganalisis stabilitas dan distribusi tegangan pada bendungan tipe RCC (Rolled-Compacted Concrete) di sisi kanan Bendungan Cibeet pada tujuh kondisi pembebanan. Perhitungan manual dilakukan menggunakan metode keseimbangan gaya-gaya untuk menilai faktor keamanan terhadap guling, geser, dan daya dukung tanah pada bendungan. Sementara itu, nilai dan distribusi tegangan dianalisis menggunakan perangkat lunak berbasis Metode Elemen Hingga (Finite Element Method, FEM) yaitu Abaqus Learning Edition 2023. FEM merupakan langkah numerik yang dipakai dalam menyelesaikan berbagai permasalahan di bidang teknik. Hasil analisis menunjukan bahwa nilai FKguling paling kecil terjadi pada Kondisi VI sebesar 4,198 yang masih lebih besar dari 1,15. FKgeser paling kecil terjadi pada Kondisi I yaitu kondisi selesai konstruksi dengan nilai FKgeser 6,63 yang masih lebih besar dari 1,7. Tinjauan daya dukung tanah menunjukan tegangan paling besar diperoleh sebesar 0,707 terjadi pada Kondisi VII dengan batas maksimal tegangan sebesar 2,57 MPa, sedangkan tegangan minimum terjadi pada Kondisi II yaitu kondisi muka air waduk normal sebesar 0,206 MPa dengan batas minimum tegangan 0. Tegangan maksimum hasil analisis diperoleh sebesar 0,718 MPa yang terjadi pada pembebanan Kondisi VI dan masih dibawah dari batas maksimal tegangan yang diizinkan yaitu 2,67 MPa.
Co-Authors A.A. Ketut Agung Cahyawan W Abdul Chalid, Nugi Andriansyah, Danil Aprilianti, Mega Devi, Marta Resmana Fahmi, Muhammad Zaki Fathir, Mirza Ghilman, Rafiqan Mochammad Intan Nuriskha Rachma Kristalia, Risa Marsalina, Sali Maulidan, Ripan Nurliana, Ade Linda Pratama, Rama Reno Rukanda, Reno Sauri Al Qurthubi, Sopyan Sulwan Permana Wiguna, Andreansyah Yusup, Arip