Judul: Analisis Erection Box Girder Menggunakan Launching Gantry pada Proyek Enam Ruas Tol Dalam Kota Jakarta
Abstrak: Pekerjaan konstruksi pada umumnya dilihat dari segi mutu, biaya dan waktu. Penelitian ini bertujuan menganalisis metode kerja, biaya dan waktu yang dibutuhkan untuk pekerjaan erection box girder menggunakan launching gantry serta membandingkannya dengan traveller. Analisis dilakukan berdasarkan pengamatan, wawancara dan data sekunder. Berdasarkan hasil penelitian, metode kerja launching gantry mencakup pembuatan precast box girder, pemasangan elemen gantry dan pemasangan box girder. Tahapan pekerjaan pemasangan box girder dengan launching gantry diantaranya adalah hanging, glueing, stressing, grouting, dismaintling spreader dan launching ke span berikutnya. Biaya seluruhnya yang dikeluarkan untuk pekerjaan metode launching gantry sebesar Rp. 36,749,953,230 dan waktu yang diperlukan adalah 103 hari. Hasil penelitian menunjukkan bahwa launching gantry menggunakan metode konstruksi span by span sedangkan traveller menggunakan balanced cantilever. Biaya untuk metode launching gantry lebih mahal dibandingkan dengan metode traveller sedangkan waktu yang dibutuhkan lebih cepat dibandingkan dengan metode traveller.
Keyword: balanced cantilever, cost, span by span, traveller method

Judul: Analisis Kekuatan Struktur Steel Box Girder Jalan Bebas Hambatan Tanjung Priok Seksi E-2A Terhadap Gempa
Abstrak: Tanjung Priok, Jakarta is one of the centers of economic activity in Indonesia, it is supported by the Jakarta International Container Terminal (JITC) and several large plants around it like PT. Pertamina and PT. Bogasari. Ground transportation is a type of transportation that is widely used by businesses to distribute the products it sells, or stored in the warehouse or to be exported out of the country by sea. Economic development of Tanjung Priok so rapidly causing traffic volume in Tanjung Priok is inadequate so the congestion. Congestion happens memperhambat economic activity in Tanjung Priok. Roads and bridges is one of the major factors in the field of transport infrastructure proponent, so do road and bridge infrastructure to keep pace with the development of economic activities in Tanjung Priok. This study aims to determine the structural strength of steel box with modeling grider CSI Bridge. Based on a study of the steel box girder Highway Tanjung Priok safe due to a combination of forces and especially the earthquake.
Keyword: 3D modeling, steel box girder analysis, Highway Tanjung Priok

Judul: Detoxification of Cassava’s Acid Hydrolyzate by Activated Carbon Method for Bioethanol Production
Abstrak: Cassava is one of natural resources for carbohydrate that also available for bioethanol production. Starch and fibers hydrolysis maybe conducted on acid condition. The restriction in acid hydrolysis is 5-hydroxymethyl furfural (HMF) and furfural formation, which inhibit yeast fermentation. This study applied two stages of detoxification, which are overliming and activated carbon adsorption methods for lowering HMF and furfural concentrations. In order to obtain tolerable amount in sugar solution, detoxification by activated carbon adsorption was done by concentration of 1%, 2.5%, 5% and 10% and duration of contact are 30 45 and 60 minutes. The results showed that overliming method decreased HMF and furfural concentrations 34.38% and 60.81%, respectively. Overliming followed by 5% activated carbon adsorption for 30 minutes produced the best sugar solution which has a lower HMF and furfural concentrations by 72.03% and 89.11%, respectively. Adsorption constants of HMF and furfural by 5% activated carbon were 0.044 g/min and 3,7 x 10-5 g/min, respectively. The concentration of ethanol produced was 5.00% (b/v) or 63.22% higher than obtained from detoxification by neutralization (NH4OH) which produced ethanol only 3.06%.
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