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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Sutandi, Arianti
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Civil Engineering, Building, Construction & Architecture Computer Science & IT

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PENGARUH UKURAN BUTIRAN MAKSIMUM TERHADAP KUAT TEKAN REACTIVE POWDER CONCRETE Sutandi, Arianti; Kushartomo, Widodo
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 3, No 1 (2019): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v3i1.5193

Abstract

Kuat tekan beton merupakan faktor yang paling dominan untuk menentukan kualitas beton dibandingkan faktor lainnya. Kuat tekan beton atau mutu beton dipengaruhi oleh beberapa faktor diantaranya adalah perbandingan semen terhadap air (fa/s), kualitas material, perbandingan komposisi material dan sebagainya. Gradasi butiran agregat  juga merupakan salah satu faktor yang berperan penting untuk menentukan mutu beton. Agregat dengan ukuran butiran yang lebih halus dan bervariasi dapat memperkecil volume pori yang terbentuk, sehingga susunan butiran yang baik akan menghasilkan kepadatan tinggi dan porositas minimum. Pada penelitian ini dipelajarai pengaruh ukuran butiran maksimum agregat halus terhadap  kuat tekan reactive powder concrete. Benda uji dibuat dalam bentuk silinder dengan diameter 100,0 mm dan tinggi 200,0 mm. Ukuran diameter maksimum agergat halus dibuat dalam tiga jenis yaitu 300 µm. 425 µm, dan 600 µm. Seluruh benda uji dirawat dengan teknik perendaman selama 3 hari, dilanjutkan dengan steam curing pada temperature 90 oC – 95 oC selama 4 jam. Pengujian kuat tekan dilakukan pada umur 7 hari. Hasil pengujian menunjukkan terjadinya peningkatan kuat tekan recative powder concrete dengan bertambah kecilnya ukuran butiran maksimum agregat halus. The compressive strength of concrete is the most dominant factor to determine concrete quality compared to other factors. Concrete compressive strength and grade are influenced by several factors, including water cement ratio (fa/s), material quality, material composition, and others. Aggregate gradation is also one of the dominant factors that play an important role in determining the quality of concrete. Finer and varied aggregate size can reduce void volume, so that a good granular structure will produce high density and minimum porosity. In this research, the effect of maximum size of fine aggregate on the compressive strength of reactive powder concrete was studied. The specimens were made in cylindrical shapes with a diameter of 100.0 mm and a height of 200.0 mm. The maximum diameter size of fine agergate was varied in three types, 300 µm. 425 µm, and 600 µm. All specimens were treated with immersion technique for 3 days, followed by steam curing at 90 oC - 95 oC for 4 hours. Compressive strength testing was done at the age of 7 days. The test results showed that the increase of maximum fine aggregate size increase the compressive strength of reactive powder concrete.
MEMPERKIRAKAN PERBANDINGAN KADAR AIR SEMEN PADA BETON KERAS Kushartomo, Widodo; Sutandi, Arianti; Linggasari, Dewi
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 4, No 1 (2020): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v4i1.7416

Abstract

Comparison of cement water content (w / c-ratio) is one important factor to determine the strength of concrete, so it is important to know the ratio of the amount of water used in a concrete mix. Many problems that arise related to the quality of concrete in ready-made buildings require an in-depth investigation of the composition of concrete materials in order to estimate the quality of concrete including the ratio of the amount of water to cement. Estimating the ratio of the amount of water to the amount of cement in hard concrete is not an easy matter, there are many factors that influence it. A number of special tests are needed on hard concrete to get the accuracy of the ratio of cement water content (w / c-ratio). A number of test specimens were prepared for testing with known water content and amount of cement. After going through the treatment process for 28 days, at the age of 60 days all test specimens are examined both chemically and volumetricly to recalculate the amount of water and cement that has been used. The calculation results show the technique used has a suitability of 99% to the planning. ABSTRAKPerbandingan kadar air semen (w/c-ratio) merupakan salah satu faktor penting untuk menentukan kekuatan beton, sehingga penting sekali mengetahui perbandingan jumlah air yang digunakan dalam suatu adukan beton. Banyak permasalahan yang muncul terkait mutu beton pada bangunan yang sudah jadi memerlukan penyelidikan     yang mendalam terhadap komposisi material beton tersebut guna memperkirakan mutu beton termasuk didalamnya perbandingan jumlah air terhadap semen. Memperkirakan perbandingan jumlah air terhadap jumlah semen pada beton keras bukan merupakan suatu perkara yang mudah, ada banyak faktor yang mempengaruhinya. Diperlukan sejumlah pengujian khusus pada beton keras untuk mendapatkan akurasi nilai perbandingan kadar air semen (w/c-ratio). Sejumlah benda uji disiapkan untuk pengujian dengan kadar air dan jumlah semen yang telah diketahui. Setelah melalui proses perawatan selama 28 hari, pada umur 60 hari seluruh benda uji diperiksa baik secara kimiawi maupun secara volumetrik untuk menghitung ulang jumlah air dan semen yang telah digunakan. Hasil perhitungan menunjukkan teknik yang digunakan  memiliki kesesuaian sebesar 99% terhadap perencanaan.
Effek Ukuran Butiran Maksimum terhadap Nilai Modulus of Rupture Reactive Powder Concrete Kushartomo, Widodo; Linggasari, Dewi; Sutandi, Arianti
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 26, Nomor 1, JULI 2020
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (588.359 KB) | DOI: 10.14710/mkts.v26i1.25088

Abstract

Modulus of rupture (R) is a measurement of a tensile strengh of a concrete beam. The value of R is affected by the size of fine aggregat grain, the density of the concrete beam and the water-cement ratio. The unit of R is MPa expressing the tensile strength of the concrete beam without reinforcement to withstand a buckling failure. The distance between the supports of the concrete beam should not be less than three times of the height of the beam. In this research the size of the concrete beam speciment was 100 mm x 100 mm x 350 mm, the maximum fine aggregate size was varied (300 µm, 425 µm, and 600 µm) and the water-cement ratio was also varied (0.25, 0.22 and 0,20). All speciments were cured by steam curing and were tested after seven days. The results show that the larger the size of the fine aggregat grain and the higher the water-cement ratio, the smaller the R.
Co-Authors Linggasari, Dewi Widodo Kushartomo, Widodo