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All Journal RACIC : Rab Construction Research JURNAL TEKNIK SIPIL UNAYA Jurnal Teknik Industri Terintegrasi (JUTIN) Jurnal Teknik Sipil
Nurul Rochmah
Universitas 17 Agustus 1945 Surabaya
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Abu Sekam Sebagai Subtistusi Semen terhadap Slump Flow dan Berat Isi pada Flowing Concrete Nurul Rochmah; Bantot Sutriono; Michella Beatrix; Dew Pertiwi
Jurnal Teknik Sipil Vol 2, No 2 (2021)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (218.338 KB) | DOI: 10.31284/j.jts.2021.v2i2.2471

Abstract

In a construction project, the presence of dense reinforcement between reinforcement has its own problems when casting, namely when compaction it is very difficult to use a vibrator because of the density between the reinforcement. To minimize the negative impact of this, flowing concrete is made so that without using a vibrator, the concrete will self-compact properly. The constituent materials of flowing concrete are aggregate, cement and water. In the process of making cement production will produce carbon dioxide in the air, resulting in air pollution due to cement manufacture. To minimize the impact of air pollution due to cement, in this study, we tried one of the constituents of flowing concrete, namely partially substituted cement, so as to minimize air pollution. In this study, rice husk ash, which is the residue from burning rice husks, was used as a partial substitution of cement. The method used is conducting research in the laboratory. In this study, the variation of husk ash as a cement substitution was 0%, 5%, 7.5%, 10% and 12.5% with the addition of 1.5% superplasticizer. From the results of the study, the smallest diameter of slump flow was 53.17 cm in a mixture of 10% rice husk ash. The largest dry concrete density value is 2482.77 kg/m3 at 10% rice husk ash mixture. The conclusion that can be drawn is that based on slump flow and dry concrete density, the optimal substitution percentage for rice husk ash is 10 percent.
Pemanfaatan Limbah Fly Ash Pada Beton Mutu Tinggi Sebagai Bahan Tambah Untuk Campuran Beton Muhammad Andi Rizki Ferdiansyah; Nurul Rochmah
Jurnal Teknik Sipil Unaya Vol 9, No 1 (2023): Januari 2023
Publisher : Center for Research and Community Service (LPPM) University of Abulyatama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30601/jtsu.v9i1.3059

Abstract

Concrete with a compressive strength of more than 41.4 MPa is known as high strength concrete. High strength concrete is often used for precast concrete, especially for the construction of buildings, bridges, and also roads with wide spans. One of the materials used in this research is the addition of fly ash for concrete mixtures. Fly ash also has pozzolanic properties when mixed with other concrete mixtures. This research aims to analyze each proportion of fly ash used and also to determine the effect of using fly ash added materials, especially for compressive strength tests on high-quality concrete. In this study, fly ash was used with proportions of 0%, 5%, 10%, 12%, 15%, 20% using wcr 0.32 and also 0.4% superplasticizer level used. One of the tools used in this test is a cylindrical tube which has a size of 15 x 30 cm. Based on the research that has been done, the highest result for the test is 52.01 MPa for a percentage of 10% in 28 day concrete. It can be concluded that using fly ash material can increase the compressive strength of concrete by up to 10%, but the proportion above 10% decreases the compressive strength of concrete.
Pemanfaataan Abu Vulkanik Sebagai Substitusi Sebagian Semen pada Beton Alir Conrad Esguerra Jordy Beoang; Nurul Rochmah
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 9 No. 2 (2026): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v9i2.57154

Abstract

This study aims to analyze the effect of using volcanic ash as a partial replacement for cement on the slump value of self-compacting concrete. The main issue examined is the decrease in slump value as the percentage of volcanic ash increases, which affects the flowability and workability of the concrete. The substitution variations used are 0%, 5%, 10%, 20%, and 25%, with the addition of 1.5% superplasticizer Sika Viscocrete-3115N to improve workability. The research method involves preparing self-compacting concrete specimens for each variation and testing them using the slump flow method in accordance with ASTM C143 standards. Data analysis is carried out by comparing the average slump values of each mixture variation. The results show that increasing the percentage of volcanic ash leads to a decrease in slump value. The mixture without substitution produces the highest slump value, while the 25% substitution results in the lowest due to the higher absorption capacity of volcanic ash, which reduces the mixture’s workability. Overall, volcanic ash can still be used within certain limits. 
PENGARUH PENGGUNAAN ABU SERABUT KELAPA (ASK) SEBAGAI BAHAN TAMBAH TERHADAP KUAT TEKAN BETON ALIR Santoso Nugroho; Nurul Rochmah
Racic : Rab Construction Research Vol. 9 No. 1 (2024): JUNI
Publisher : LPPM Universitas Abdurrab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36341/racic.v9i1.4210

Abstract

Development in Indonesia continues to increase every year, this is due to the increasing population in this country. This construction requires important construction materials, such as concrete. Flowing concrete is a type of concrete that has a slump flow value of more than 19 cm, but still maintains the natural strength of the concrete according to ASTM C 1017 standards. Flowing concrete is usually used for placing thin sections or in areas of solid reinforcing steel to reduce handling costs, explained by (Dawood and Ramli 2010). To produce flowable concrete, it is necessary to use a superplasticizer so that the cement particles can be suspended evenly and separated into fine particles in the concrete mixture. Based on the research results, it shows that the addition of coconut fiber ash with percentages of 0%, 2.5%, 5%, 7.5% and 10% with superplasticizer of 1.5% of the cement weight to determine the compressive strength of the concrete. The coconut fiber ash test object used acts as an additive in the optimum concrete mixture. The sample used was a 15 x 30 cm cylinder for testing the compressive strength of coconut fiber ash at the age of 7 days, 14 days and 28 days. The test results showed that with the addition of coconut fiber ash, the compressive strength of the concrete experienced fluctuations up and down at mixed percentages of 2.5% and 5%, while at percentages of 7.5% and 10% it tended to decrease compared to normal concrete.
Co-Authors Bantot Sutriono Conrad Esguerra Jordy Beoang Dew Pertiwi Michella Beatrix Muhammad Andi Rizki Ferdiansyah Santoso Nugroho