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All Journal Teknisia Jurnal Civil Engineering Study
Mochamad Teguh
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Civil Engineering, Building, Construction & Architecture Engineering

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Effect of coconut shell ash substitution on compressive strength, wear resistance and water absorption in paving blocks Khairul Nur Ihfansyah; Mochamad Teguh
Teknisia Vol 29 No 1 (2024): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol29.iss1.art4

Abstract

Waste refers to leftover material generated from production processes, industrial activities, or other human activities, often considered discarded due to its lack of economic value. Coconut shell waste is one such material that has not been optimally utilized, and it often accumulates without adequate disposal. However, coconut shell ash, which contains silica, can potentially enhance the compressive strength of paving blocks. This study investigates the effect of coconut shell ash substitution on the compressive strength, wear resistance, and water absorption of paving blocks. The tests were conducted in accordance with SNI-03-0691-1996 standards, including compressive strength, wear resistance, and water absorption tests. Coconut shell ash was substituted at percentages of 5.5%, 7.5%, 9.5%, 11.5%, and 13.5% by weight of cement. The paving blocks were tested at 28 days. The mixture used a 1:3 ratio of cement to sand, with the sand comprising equal parts Merapi and Progo River sand to balance their different grain characteristics—Merapi sand being angular and sharp, and Progo River sand being fine and round. The compressive strength, wear resistance, and water absorption of normal paving blocks were found to be 36.925 MPa, 0.085 mm/min, and 2.132%, respectively. The highest optimal performance was achieved at 9.5% coconut shell ash substitution, yielding a compressive strength of 40.450 MPa, wear resistance of 0.086 mm/min, and water absorption of 2.349%, meeting the quality category A standard for roads.
Upaya Peningkatan Kuat Tekan Beton Porous Dengan Bahan Tambah Pasir dan Viscocrete Setiawan, Agung; Mochamad Teguh
Jurnal Civil Engineering Study Vol. 5 No. 02 (2025): Jurnal Civil Engineering Study
Publisher : Civil Engineering of Universitas Islam Nahdlatul Ulama Jepara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34001/ces.v5i02.1575

Abstract

Beton Porous memiliki kuat tekan rendah dibanding dengan beton konvensional. Aplikasi beton porous meliputi jalur pejalan kaki, area parkir, trotoar dan jalur sepeda. Beton porous digunakan karena kemampuan meresapkan air sebagai drainase vertikal. Spesifikasi khusus Bina Marga Skh.-1.5.14. Tahun 2022 Tentang Perkerasan Beton Porous (Porous Concrete) mensyaratkan kuat tekan 20 MPa untuk jalur sepeda dan pejalan kaki. Campuran beton porous terdiri dari semen, agregat kasar, sedikit atau tanpa agregat halus, air dan bahan tambah kimia. Komposisi variasi ukuran agregat beton porous yang berbeda-beda dapat meningkatkan kuat tekan. Desain campuran pada penelitian ini menggunakan 3 ukuran agregat yaitu Ukuran agregat lolos saringan 19 mm tertahan 12,5 mm, lolos ayakan 12,5 mm tertahan 9,5 dan lolos 9,5 mm tertahan 4,75. Bahan pengisi pasir variasi 0%, 10%, 20%, 30%, 40%, 50%, dan 60% dari berat semen. Admixture Viscocrete 1003 0,4% dari berat semen dan fas 0,3. Kuat tekan lebih besar 20 MPa. tercapai pada persentase bahan pengisi 40% dan 50%. Nilai permeabilitas sebesar 0,49 –2,54 cm /dt.
The Time History of a Specific Area in Yogyakarta with a Subduction Earthquake Source Based on the 2002 Earthquake Map Wisnu Erlangga; Mochamad Teguh; Lalu Makrup; Jafar; Maharani Dagi Saputri
Teknisia Vol 28 No 2 (2023): Teknisia
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol28.iss2.art3

Abstract

Indonesia is a country that is very prone to earthquake disasters. Earthquakes cause damage especially to buildings. In building planning, the usual earthquake load is the earthquake load from the spectral response. The use of earthquake loads from time history is very rarely used because of the difficulty of finding accurate data for an area. In this study, Alana Hotel and Apartment were chosen as research objects to find artificial time history. All earthquake data affecting Yogyakarta region were collected from several sources. Seismic hazard analysis in this study uses the PSHA (Probabilistic Seismic Hazard Analysis) method by calculating the main earthquake only. The selection of attenuation functions is based on the similarity of geological and tectonic conditions in Indonesia. These attenuation functions produce a seismic hazard curve and a uniform hazard spectrum response. The selection of time history data for bedrock is based on the results of the deaggregation process in the form of dominant magnitude and dominant distance from the subduction earthquake source. It is necessary to adjust the spectrum response in the time history data to fit the research location. Furthermore, earthquake waves from the bedrock are propagated to the surface. The results show that the peak time history acceleration value after surface propagation increased by 1.51 times than the time history in bedrock.
Co-Authors agung setiawan Jafar Khairul Nur Ihfansyah Lalu Makrup Maharani Dagi Saputri Wisnu Erlangga