Herri Mahyar
Politeknik Negeri Lhokseumawe

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PERENCANAAN GELAGAR BETON PRATEGANG PADA JEMBATAN KEUDE RANTO PEUREULAK KABUPATEN ACEH TIMUR

Portal: Jurnal Teknik Sipil Vol 9, No 1 (2017)
Publisher : Politeknik Negeri Lhokseumawe

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Abstract

Keude Ranto Peureulak Bridge a bridge connecting Keude Ranto Panjang with Keude Geurobak village and other villages in Ranto Peureulak Sub-district, East Aceh District. Keude Ranto Peureulak Bridge is planned with a span length of 20.8 meters and width of 7 meters. The longitudinal axis planned for the bridge is the posttractive pretreat type concrete girder. The girder plan includes gelagar dimensioning, stress calculation, prestress loss, cross-sectional capacity, deflection control, and drawing. The quality of concrete used is fc = 40 Mpa, the tendon used is seven wire strand diameter ½ inch with 51 mm diameter tendon sheath. Tendon fpu voltage = 1860 Mpa, fy threaded steel reinforcement = 320 Mpa, plain steel reinforcement fy = 240 Mpa, and efficient cross-sectional height is 0.9 meters. From the calculation results obtained the moment that occurred on the girder of 2563,439 kNm on the calculation of the third combination. The number of tendons obtained from the calculation is 3 pieces with 7 pieces of strand on each tendon. Losing the total prestress force is 380,694 Mpa. The principal reference is used D13 mm, the shear reinforcement is used Ø10-100 mm at the support area and Ø10-600 mm in the field area. The ultimate moment capacity of the prestress beam is 5575.60 kNm from the calculation of the third combination. The largest deflection of 0.0247 meters due to a combination of two loads. All the results of the calculations obtained are safe to use.Keywords: girder, prestress, tendon, reinforcement, deflection

PEMAKAIAN ADDITIVE MICRO SILICA DALAM CAMPURAN BETON UNTUK MENINGKATKAN KUAT TEKAN BETON NORMAL

Portal: Jurnal Teknik Sipil Vol 5, No 1 (2013)
Publisher : Politeknik Negeri Lhokseumawe

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Abstract

Micro silica types sikafume is one plus altemate materials (additive) than fly ash is often used to increase the compressive strength of concrete. Composition of the same material used on condition fas 0.5. Addition sikafume in concrete mixed with composition 0%, 5%, 10%, 15, and 20%. The Specimens used in this study is a concrete cylinder diameter of 15 cm and height 30 cm by 5 pieces for each sample. Compressive strength testing done at the time the specimen reaches the age of 3,7, 14, and 28 days. The result showed the maximum compressive strength of concrete at 28 days is 21 MPa without adding sikafume. Maximum compressive strength due to the use of additive type sikafume (15%) achieved at the age of 28 days with a concrete compressive strength of 34 MPa.

PEMANFAATAN ABU SEKAM PADI SEBAGAI BAHAN CAMPURAN BETON AGROPOLYMER

Portal: Jurnal Teknik Sipil Vol 2, No 2 (2010)
Publisher : Politeknik Negeri Lhokseumawe

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Abstract

Constribution of production PC every year at glasshouse emission continue to experience of increase, estimated about 7% from totalizing the glasshouse emission transmitted to atsmosphere earth. On that account, is very needed the new inventions of concrete technology to produce the friendly environment. Some alternatives among its by making the concrete polymer which materials base natural, be like fly ash and rice husk ash ( RHA ) . this research use the RHA upon which mixture to make the concrete agropolymer. Concrete agropolymer use fixative of silicate sodium condensation mixture, hydroxide sodium and RHA. Variable remain to this research is strength the concrete agropolymer. Free variable consist of the ratio variation water and agropolymer solid that is 0,6 and 0,7, treatment time during 3,7, 14 and 21 day. Temperature treatment of object test at room temperature, each;every variation made by the object test the cube with side of 10 cm counted 5. This research can give the alternative to invention of friendly concrete of environment by exploiting the waste materials natural agricultural produce, but not yet application can at building construction because of strength depress the concrete still lower. Strength depress the obtained by concrete range from 4 - 5 Mpa at the age of concrete of 21 day. It’s needed to do the further research to get the ideal composition of materials concrete agropolimer this so that can be obtained the strength depress the application concrete able to building construction.Keyword : RHA, agropolymer, concrete strength