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All Journal JURNAL TEKNIK SIPIL UNAYA Jurnal Teknik Sipil
Nurul Rochmah
Universitas 17 Agustus 1945 Surabaya
Civil Engineering, Building, Construction & Architecture Materials Science & Nanotechnology

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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.
Co-Authors Bantot Sutriono Dew Pertiwi Michella Beatrix Muhammad Andi Rizki Ferdiansyah