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All Journal Jurnal Teknik Sipil ITENAS REKA RACANA
Abinhot Sihotang
Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan
Civil Engineering, Building, Construction & Architecture Education

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PENGARUH MODULUS KEHALUSAN PASIR PADA BETON DENGAN MIXED DESIGN METODE ACI Hamid, Agus; Suraatmadja, Djuanda; Sihotang, Abinhot
Jurnal Teknik Sipil ITENAS Vol 5, No 1 (2007): APRIL 2007
Publisher : Jurnal Teknik Sipil ITENAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1354.378 KB)

Abstract

Fineness modulus of sand was defined to be total number percentage of granular cumulative that is restrained over a standardized sieve in terms of a weight percentage. In a concrete mix design, the proportion of a coarse aggregate is dependent upon the percentage of fineness modulus of sand. The research is designed to examine any definition of fineness modulus of sand begins at fineness modulus in a concretemix. The amount of experimental materials are 3 to be used to each mixed composition. An experiment was conducted in a cylindrical  experimental with 10 cm in diameter, 20 cm in height. The observation is conducted at 14 days, 21 days, 28 days with ACI method. The research shown that best fineness modulus of sand applied to 25 MPa quality concrete mix is a mixture with fineness modulus of sand of 2,63 – 3,38. While best fineness modulus of sand applied to 40 MPa quality concrete in concrete mix design are 3,32 – 3,38.
Studi Mengenai Kadar Maksimum Abu Terbang Sebagai Subtitusi Semen pada Campuran Beton dengan Kuat Tekan Tetap. (Hal. 42-51) Dewanti, Dewindha Putri; Sihotang, Abinhot
RekaRacana: Jurnal Teknil Sipil Vol 5, No 3: September 2019
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (650.509 KB) | DOI: 10.26760/rekaracana.v5i3.42

Abstract

ABSTRAKPenggunaan beton dalam proyek konstruksi yang semakin besar, menuntut penggunaan semen yang semakin tinggi. Upaya yang banyak dilakukan adalah melakukan substitusi semen dengan suatu bahan yang sifatnya sama dengan semen. Abu terbang (fly ash) menjadi salah satu alternatif dalam pengurangan penggunaan semen. Pembuatan campuran beton normal digunakan cara SNI, dan untuk campuran beton abu terbang digunakan perancangan campuran beton metode Dreux dengan permodelan blended cement. Kuat tekan rencana yang dirancang sebesar 40 MPa dengan substitusi semen oleh abu terbang sebesar 0% sampai dengan 50%, dengan nilai pertambahan 5%. Ukuran maksimum agregat kasar yang digunakan adalah 20 mm, dan pengujian berupa kuat tekan beton dilakukakan saat umur beton mencapai 7 hari, 14 hari, dan 28 hari. Hasil kuat tekan beton umur 28 hari menunjukkan kadar maksimum substitusi semen oleh abu terbang menggunakan cara Dreux Gorrise dengan permodelan blended cement hanya mencampai kadar 20% abu terbang.Kata kunci: beton abu terbang, Dreux Gorrise, kuat tekan, semen blended ABSTRACTThe use of concrete in construction projects is getting bigger, demanding the use of cement which is increasingly high. The current effort is to do cement substitution with a material that has the same properties of cement. Fly ash is an alternative in reducing the use of cement. The preparation of normal concrete mixtures is used by SNI method, and for fly ash concrete mixtures, the Dreux method as a blended cement modeling concrete mixture design is used. The planned compressive strength of 40 MPa with cement substitution by fly ash is 0% to 50%, with a 5% increase. The maximum size of coarse aggregate used is 20 mm, and testing in the form of concrete compressive strength is done when the concrete reaches 7 days, 14 days, and 28 days. The results of 28 days old concrete compressive strength showed the maximum cement substitution level by fly ash using the Dreux Gorrise method with blended cement modeling only reaching 20% fly ash content.Keywords: fly ash concrete, Dreux Gorrise, compressive strength, blended cement
Studi Mengenai Pengaruh Ukuran Maksimum Agregat Kasar pada Campuran Beton Memadat Mandiri (SCC). (Hal. 62-73) Hermansah, Fitri Yanto; Sihotang, Abinhot
RekaRacana: Jurnal Teknil Sipil Vol 5, No 1: Maret 2019
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (792.845 KB) | DOI: 10.26760/rekaracana.v5i1.62

Abstract

ABSTRAKBeton memadat mandiri (SCC) adalah beton inovatif yang tidak memerlukan getaran pada saat proses pelaksanaanya. Beton ini diberikan zat tambah berupa superplasticizer pada campurannya agar dapat mengalir. Berdasarkan EFNARC, beton ini harus memenuhi 3 (tiga) kriteria yaitu filling ability, passing ability dan segregation resistance. Oleh karena itu dilakukan penelitian untuk mengetahui sifat beton segar dan beton keras pada campuran beton SCC dengan ukuran agregat kasar maksimum 10 mm dan 20 mm. Kemudian komposisi campuran juga dibedakan berdasarkan modulus kehalusan gabungan agregat yang seragam dan bervariasi. Kuat tekan target pada campuran beton SCC 27 MPa dan 47 MPa.Perancangan campuran beton SCC untuk penelitian ini menggunakan cara SNI yang dimodifikasi dengan metode Dreux. Kadar superplasticizer yang digunakan untuk semua jenis campuran sebesar 1,5% dari berat semen. Hasil pengujian beton SCC menunjukan campuran mempunyai karakteristik yang relatif seragam jika modulus kehalusan agregat campuran mempunyai nilai yang sama.Kata kunci: beton memadat mandiri (SCC), modulus kehalusan, ukuran maksimum agregat, superplasticizer ABSTRACTSelf Compacting Concrete (SCC) is an innovative concrete that doesn’t require vibration during the process. This concrete is added with a superplasticizer in the mixture. Based on EFNARC, this concrete must fulfill 3 (three) conditions, such asfilling ability, passing ability and segregation resistance. Therefore, a study was conducted to determine the characteristic of fresh concrete and hard concrete in SCC mixtures with maximum size of 10-mm and 20-mm coarse agregates. The target compressive strength of SCC mixturesis 27 MPa and 47 MPa. In this study,the design of the SCC mixtures uses the SNI method that modified by the Dreux Method. The superplasticizer content used for all types of SCC mixtures is 1.5% of the weight of cement. The SCC test result shows the mixtures have relatively uniform characteristics if the fineness modulus of aggregate has the same value.Keywords: self-compacting concrete (SCC), fineness modulus, maximum agregate size, superplasticizer
Kajian Karakteristik Beton Memadat Sendiri yang Menggunakan Serat Ijuk (Hal. 54-65) Nurjamilah, Iis; Sihotang, Abinhot
RekaRacana: Jurnal Teknil Sipil Vol 4, No 4: Desember 2018
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (832.276 KB) | DOI: 10.26760/rekaracana.v4i4.54

Abstract

ABSTRAKKajian karakteristik beton memadat sendiri yang menggunakan serat ijuk merupakan sebuah kajian yang dilakukan untuk mengetahui pengaruh penambahan serat ijuk terhadap karakteristik beton memadat sendiri (SCC). Beton memadat sendiri yang menggunakan serat ijuk (PFSCC) didesain memiliki campuran yang encer, bermutu tinggi (= 40 MPa) dan memiliki persentase kekuatan lentur yang lebih baik. PFSCC  didapatkan dari hasil pencampuran antara semen sebanyak 85%, fly ash 15%, superplastizicer 1,5%, serat ijuk 0%, 0,5%; 1%; 1,5%; 2% dan 3% dari berat binder (semen + fly ash), kadar air 190 kg/m3, agregat kasar 552,47 kg/m3 dan pasir 1.063 kg/m3. Semakin banyak persentase penambahan serat ijuk ke dalam campuran berdampak terhadap menurunnya workability beton segar. Penambahan serat ijuk yang paling baik adalah sebanyak 1%, penambahan tersebut dapat meningkatkan kekuatan tekan beton sebesar 13% dan lentur sebesar 1,8%.Kata kunci: beton memadat sendiri (SCC), beton berserat, beton memadat sendiri yang menggunakan serat ijuk (PFSCC), serat ijuk ABSTRACTThe study of characteristics self compacting concrete using palm fibers is a study conducted to determine the effect of adding palm fibers to characteristics of self compacting concrete (SCC). palm fibers self compacting concrete (PFSCC) is designed to have a dilute mixture, high strength (= 40 MPa), and have better precentage flexural strength. PFSCC was obtained from mixing of 85% cement, 15% fly ash, 1.5% superplastizicer, 0%, 0.5%, 1%, 1.5%, 2% and 3% palm fibers from the weight of binder  (cement + fly ash), water content 190 kg/m3, coarse aggregate 552.47 kg/m3 and sand 1,063 kg/m3. The more persentage palm fibers content added to the mixture makes workability of fresh concrete decreases. The best addition of palm fiber is 1%, this addition can increases the compressive strength 13% and flexural strength 1.8%.Keywords: self compacting concrete (SCC), fiber concrete, Palm fiber self compacting concrete (PFSCC), palm fiber
Co-Authors Agus Hamid Dewanti, Dewindha Putri Djuanda Suraatmadja Hermansah, Fitri Yanto Nurjamilah, Iis