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Sumajouw, M. D.J
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Analisa Struktur Cara Kekakuan: Sebagai Alat Bantu Alternatif Dalam Perhitungan Stuktur Harahap, John. Th.; Sumajouw, M. D.J; Wallah, S. E.
JURNAL ILMIAH MEDIA ENGINEERING Vol 6, No 3 (2016): JURNAL ILMIAH MEDIA ENGINEERING
Publisher : Sam Ratulangi University

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ABSTRACT Analysis of a frame structure is necessary for evaluation of how large is the structural response of applied load. In general, the understanding of Stiffness Method were done by using simple structure example. As the number of structural dimensions increases which could be represented by the number of joint and element, will required the use of adequate sophisticated computers and other application of computation. One of the most popular computation application is MS Excel. The aims of this research are to make an alternative MS Excel oriented structural analysis tool and to make comparison of the computation output with other program available in the market. Otomatization in the computation of stiffness method by MS Excel oriented will make the analysis steps which consist of numerical processes, now could be display on the sheets so that we could verify its validity according to the structural theory. This transparant computational processess will alleviate the confidency of the computational out put and in the practice, it is appropriate to be use for educational purpose or as the comparison to the other output using other application program. Computation output of six types of frame structures using this alternative tools give less significance output so that it would be conclude that thoh alternative tool could be used. The transparancy of the computation were appropriate to be used in the learning processess and also it could be used as the comparison tools to the other available structural analysis application. Key words : stiffness method, frame structures,transparancy,element stiffness,structure stiffness ABSTRAK Analisis struktur rangka dimaksudkan untuk mengetahui besar respons struktur terhadap beban. Pemahaman metode kekakuan dalam perkuliahan, umumnya dilakukan dengan memakai contoh struktur sederhana. Meningkatnya ukuran struktur yang direpresentasikan oleh banyaknya titik kumpul dan elemen batang, mengharuskan pemakaian komputer dan aplikasi perhitungan yang sesuai. Salah satu aplikasi populer untuk menghitung ialah MS Excel. Tujuan yang ingin dicapai dengan penelitian ini membuat alat bantu alternatif analisis struktur berorientasi MS Excel dan melakukan perbandingan hasil perhitungan dengan output aplikasi lain yang sudah ada di pasaran. Otomatisasi perhitungan cara kekakuan berorientasi MS Excel membuat. tahapan analisis yang bentuk fisiknya merupakan pengolahan angka, tampil pada sheet sehingga dapat diperiksa kebenarannya sesuai dengan teori. Proses perhitungan yang transparan meningkatkan kepercayaan atas hasil perhitungan dan dalam praktek, cocok digunakan dalam edukasi atau sebagai pembanding terhadap output aplikasi lainnya. Hasil perhitungan enam jenis struktur rangka dengan program bantu alternatif dengan program aplikasi lain, memberikan perbedaan yang sangat kecil sehingga dapat disimpulkan bahwa output program bantu alternatif, dapat digunakan. Transparansi perhitungan merupakan alasan program bantu alternatif cocok digunakan dalam proses perkuliahan dan sebagai alat pembanding dari aplikasi analisis struktur yang lain. Kata kunci : metode kekakuan , struktur rangka,transparansi,kekakuan elemen, kekakuan struktur Jurnal Ilmiah Media Engineering Vol.6 No.3, September 2016 (529-534) ISSN: 2087-9334530 
PENGARUH KADAR AIR DAN SUPERPLASTICIZER PADA KEKUATAN DAN KELECAKAN BETON GEOPOLIMER MEMADAT SENDIRI BERBASIS ABU TERBANG Gumalang, Stevanny; Wallah, S E; Sumajouw, M. D.J
JURNAL ILMIAH MEDIA ENGINEERING Vol 6, No 3 (2016): JURNAL ILMIAH MEDIA ENGINEERING
Publisher : Sam Ratulangi University

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AbstractEenvironmental issues that caused by the production of portland cement and the development needs of the concrete casting technology, where in the last few decade scientists has started to do research and development of fly ash based - self compacting geopolymer concrete. Fly ash based - self compacting geopolymer concrete is a concrete which made of geopolymer material (fly ash) that combined with aggregate without using of portland cement. It is must have workability criteria of self compacting concrete (SCC). To get SCC’s required workability, it needs addition of extra water to the mixture of geopolymer concrete. But with the addition of extra water, the mixture of fresh geopolymer concrete could undergo dispersion and segregation, also might be affect to the chemical binding of geopolymer material. So, it needs admixture material such as superplasticizer which serves to increase workability of fresh geopolymer concrete although the amount of water content is reduced. From the description above, the author conducted a study that aims to determine the extent of the influence of water and superplasticizer on the workability and compressive strength of fly ash based -self compacting geopolymer concrete.Fly ash based- Self Compacting Geopolymer Concrete planned as follows, Fly ash (Class F) in dry condition; coarse and fine aggregates in a SSD condition; Sodium Hydroxide’s concentration is 14M; Alkaline / Fly Ash Ratio is 0.8; Doses of Viscocrete-10 are 0%, 1%, 2% and 3%; Extra Water / Fly Ash ratio are 0, 0.2, 0:25, 0.3, and 0,32; curing in an oven for 48 hours at temperature 70 °C.The maximum slump flow value according to EFNARC for Self Compacting Concrete is 67 cm that obtained on the addition of 3% superplasticizer and the ratio of extra water / fly ash is 0.3. Filling ability and viscosity specified in the V-Funnel test is 9.50 seconds. The test results of passing ability using the L-shaped box shows blocking ratio H2 / H1 is 0.83 seconds. Extra Water on Geopolymer Concrete provide significant impact on the slump flow value. Addition of extra water 0.3 is already getting slump flow value required by EFNARC for self compacting concrete ( 67 cm > 65 cm). The optimum composition in terms of qualified workability of Self Compacting Concrete and compressive strength are obtained on the addition of 3% superplasticizer and 0.3 extra water ratio. They give slump flow value at 67 cm and an average compressive strength of 16.28 MPa. So that in this composition, the concrete can be categorized as fly ash based - self compacting geopolymer concrete. The maximum compressive strength obtained on the mixing without extra water which is gives an average 30.55 MPa.Keywords: water content, superplasticizer, workability, compressive strength, Self Compacting Geopolymer Concrete
PENGARUH KEHALUSAN SEMEN TERHADAP PENINGKATAN KEKUATAN MORTAR Slat, Ventje Berty; Sumajouw, M. D.J; Wallah, S. E.
JURNAL ILMIAH MEDIA ENGINEERING Vol 6, No 3 (2016): JURNAL ILMIAH MEDIA ENGINEERING
Publisher : Sam Ratulangi University

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AbstractSlurry density which is determined by the number of cavities / micro pores in the cement paste will reduce the strength to withstand loads on an element due to a reduction in the broad field of contact . Estrangement between aggregate and paste will causes micro cracks and result in crack propagation . Therefore, it is very important to reduce the number of pores in mortar and improve the hydration of cement more perfect . Effective method to overcome the problem of gap graded grainwhich serves as an adhesive as well as the use of granular cement filler is finer than standard cement The smaller cement granules will produce better hydration process .The aimed this study are to investigate the effect of fineness of cement in the mortar with a modified fineness method. The composition of the fineness of cement used are vary between 200 Standard , 400 , 500 and 600 m2 / kg . Specimens used have dimension of 50 × 50 × 50 mm and be tested at ages 3 , 7 , 14 and 28 days in order to get the compressive strength. In this study,ratio of cement to sand is 1 to 2.75 with water to cement ratio of 0.485. Type of cement used is the type of PCC ( Portland Composite Cement ) commonly used in IndonesiaResults indicate that the fineness of cement affects the mechanical properties of concrete and workability .Keywords:cement fineness , compressive strength . type of cement, mechanical properties, workabilityAbstrakKepadatan adukan ditentukan dengan banyaknya rongga/pori-pori mikro dalam pasta semen akan mengurangi kekuatan menahan beban pada suatu elemen karena terjadinya pengurangan luas bidang kontak. Kerenggangan antara agregat dan pasta menyebabkan terjadinya retak mikro dan mengakibatkan perambatan retak. Oleh karena itu menjadi sangat penting untuk mengurangi jumlah pori-pori pada mortar dan meningkatkan hidrasi semen yang lebih sempurna. Metode yang efektif mengatasi masalah kesenjangan gradasi butiran yang berfungsi sebagai perekat juga sebagai pengisi adalah penggunaan butiran semen yang lebih halus dari semen standar. Butiran semen yang lebih kecil akan menghasilkan proses hidrasi yang lebih baik.Penelitian ini bertujuan untuk menyelidiki pengaruh kehalusan semen pada mortar dengan metode modifikasi kehalusan. Komposisi kehalusan semen yang digunakan bervariasi antara 200, Standard, 400, 500 dan 600 m2/kg. Spesimen yang digunakan berukuran 50×50×50 mm dan diuji pada usia 3, 7, 14 dan 28 hari untuk mendapatkan nilai kuat tekan. Perbandingan semen dan pasir adalah 1 berbanding 2,75 dengan nilai faktor air semen 0.485 digunakan dalam penelitian ini. Jenis semen yang digunakan adalah tipe PCC (Portland Composite Cement) yang umum digunakan di Indonesia.Hasil menunjukkan bahwa kehalusan semen sangat berpengaruh terhadap sifat mekanis beton serta workability.Kata kunci : Kehalusan semen, kuat tekan. type semen, sifat mekanis, workability
Co-Authors Gumalang, Stevanny Harahap, John. Th. Slat, Ventje Berty Steenie E. Wallah