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All Journal Jurnal Teknik Sipil Unika Soegijapranata : G-SMART (Geoteknik, Struktur, Manajemen Konstruksi, Sumber Daya Air, Transfortasi)
Widija Suseno
Universitas Katolik Soegijapranata
Civil Engineering, Building, Construction & Architecture Engineering Transportation

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Pengaruh Substitusi Sebagian Agregat Halus Dengan Abu Batu Dan Penambahan Fly Ash Terhadap Kuat Tekan Beton Heronimus Lumenta; Stefanus Tri Bintoro; David Widianto; Widija Suseno
G-SMART Vol 3, No 1: Juni 2019
Publisher : Universitas Katolik Soegijapranata Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24167/gs.v3i1.1765

Abstract

The purpose of this research is to determine concrete compressive strengths with screenings variation of 0%, 25%, 50%, and 75% by addition the weight of fine aggregate (sand) and fly ash 15% by the weight of cement. The background of this research is increasing demand for concrete and the limited availability of concrete substances. Therefore innovation is needed to maintain the availability of concrete constituent materials and also to improve the quality of concrete. Up until now a lot of researches have been carried out regarding of substitute materials or added materials that can be substituted in making concrete. Based on this background the writer chose one of the added ingredients that can improve the quality (compressive strength) of concrete, namely fly ash. Fly ash produced from the remaining combustion of coal in the Steam Power Plant (PLTU).  While for substitution materials, the writer used the screenings that substituted by sand. In this study the writer used four variations of concrete with a ratio of 0% screenings : 100% sand, 25% screenings  : 75% sand, 50% screenings  : 50% sand, 75% screenings: 25% sand. Every variant was added with fly ash as much as 15% of the weight of cement.The result of this research was indicated that variations 25% screenings, 75% sand plus  fly ash of the weight of cement that having the highest quality of concrete among the other variations were as much as 298,95 kg/cm2 at the age of 7 days; 403,23 kg/cm2 at the age of 28 days; and 456,53 kg/cm2 at the age of 42 days. This was because means of air vents was in concrete filled by granules of screening so that the concrete became denser and made concrete strong press was increased.
Analisis Pengaruh Penggunaan Serat Baja 3D Dramix Dan Baja Tulangan Ditinjau Terhadap Kuat Lentur Dan Pola Retak Permukaan Pada Beton (Analysis of the Effect of Using Steel Fiber and Reinforcing Steel on Flexural Strength and Surface Crack Pattern in Concrete) Sandy Bunawan; Candra Yogi Pratama; Gabriel J.P. Ghewa; Widija Suseno
G-SMART Vol 7, No 2: Desember 2023
Publisher : Universitas Katolik Soegijapranata Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24167/gsmart.v7i2.10881

Abstract

Beton merupakan salah satu material yang mempunyai kelebihan pada kuat tekannya namun lemah pada kuat tariknya, hal ini menjadikan beton termasuk material yang getas. Penambahan baja tulangan pada beton sering digunakan untuk mengatasi kelemahan tersebut. Seiring dengan berkembangnya teknologi beton, bahan lain yang dapat mengatasi kelemahan beton dari segi kuat tariknya yaitu serat baja. Hal ini dikarenakan serat baja bekerja secara komposit dengan campuran beton. Penelitian ini bertujuan untuk mengetahui perbandingan kuat lentur dan pola retak beton serat baja dengan beton bertulang. Penelitian ini terdiri dari dua jenis sampel uji balok beton yaitu balok beton bertulang dan balok beton serat baja dengan mutu beton fc’ 25 MPa dengan masing-masing sampel sebanyak 3 sampel. Sampel uji balok beton bertulang ditambah baja tulangan polos diameter 8 mm, sedangkan balok serat baja ditambah serat baja tipe ujung kait 3D Dramix 80/60 BG. Benda uji balok beton mempunyai ukuran 15 cm × 15 cm × 60 cm. Uji kuat lentur dilakukan pada saat beton berumur 14 dan 28 hari. Berdasarkan uji kuat lentur diperoleh rata-rata hasil kuat lentur balok beton bertulang sebesar 14,64 MPa pada umur 14 hari dan 16,25 MPa pada umur 28 hari, sedangkan untuk balok beton serat baja nilai kuat lentur rata-rata sebesar 7, 38 MPa pada umur 14 hari dan 8,14 MPa pada umur 28 hari. Berdasarkan hasil penelitian diperoleh kuat lentur balok beton bertulang 50% lebih besar dibandingkan beton serat baja. 
Co-Authors Candra Yogi Pratama David Widianto Gabriel J.P. Ghewa Heronimus Lumenta Sandy Bunawan Stefanus Tri Bintoro