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Jurnal Rekayasa
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Articles 246 Documents
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TINJAUAN SIFAT-SIFAT MEKANIK BETON ALIR MUTU TINGGI DENGAN SILIKA FUME SEBAGAI BAHAN TAMBAHAN Sebayang, Surya
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Flowing concrete flow under it own weight and maintain homogeneity while filling and passing around congested reinforcement. Flowing concrete is used to reduce or eliminate the need formvibration to reduce construction cost and reducing construction time. High strength flowing concrete in this research used silica fume as additive material in flowing concrete. The properties investigated are workability, concrete setting time, and compression strength. Proportion ofmaterial for concrete determined according to ACI 211-4R-1993 and combine with Hashimoto method. The addition of silica fume to the concrete are 0 %, 3%, 6%, 9%, 12% and 15% of the cement content. The test result indicated that effect of silica fume in fresh concrete was reduced the workability of the concrete. Addition of silica fume was made fresh concrete enough cohesiveness without causing segregation. Addition of silica fume was increased the initial andfinal setting time. The cylinder compression strength of silica fume flowing concrete at 7day,14 days, and 28 day was higher than compression strength of flowing concrete without silica fume at the same days. The optimum strength of silica fume flowing concrete was 51,35 MPa at 56 days age, in 9 % presence of silica fume.
PERBANDINGAN MUTU PAVING BLOCK PRODUKSI MANUAL DENGAN PRODUKSI MASINAL Syukur Sebayang; I Wayan Diana; Alexander Purba
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Pengembangan penggunaan Paving Block sebagai alternativ perkerasan sangat menguntungkan bagi negara-negara berkembang, guna menunjang pembangunan infrastruktur seperti komplek pertokoan, perkantoran, pariwisata, tempat ibadah, kawasan perumahan guna menghubungkan antar titik di kawasan tersebut. Sekalipun paving block sudah menyebar luas penggunaannya di sekitaran wilayah Bandar Lampung, tetapi kualitas mutu yang baik masih suli tuntuk di identifikasi. Untuk mengatasi hal ini, kami telah mengadakan penelitian Evaluasi Mutu dan Aspek Ekonomi Pada Pembuatan Paving Block Secara Manual dan Pabrikasi. Tujuan dari penelitian ini adalah untuk mengetahui mutu kuat tekan paving block yang diproses secara manual dan masinal serta mengetahui aspek ekonomi dari industri pembuatan paving block. Benda uji paving block berdimensi 20 x 10 x 6 cm2 dengan komposisi campuran yang dibuat sendiri oleh industri pembuatan paving block, maka diambil sebanyak 24 sampel yang dikumpulkan dari 4 industri manual dan 2 industri masinal. Ditetapkan untuk masing-masing industri diambil 4 buah sampel. Pengamatan lapangan mutlak dilakukan untuk mengetahui proses pembuatan dan komposisi campuran yang digunakan .Benda uji diuji dengan menggunakan Compression Testing Machine (CTM), dengan meletakkan bendauji pada mesin uji dan mencatat hasil yang ditampilkan. Dari hasil penelitian bahwa mutu Paving Block yang dibuat secara Manual atau Masinal dapat memenuhi spesifikasi mutu seperti Karya Indah (Industri Manual) dengan kuat tekan rata-rata 21,26 Mpa (Mutu III), dan ANIS (Industri Masinal) dengan kuat tekan 23,07 Mpa (Mutu III).
PENGARUH PELUBANGAN PADA BADAN BALOK BETON BERTULANG TERHADAP KAPASITAS BEBAN LENTUR Vera Agustriana Noorhidana; Eddy Purwanto
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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The purpose of this study is to analyze the behaviour of reinforced concrete beam with web opening. The variable of research is the location of web opening on a beam. There were no strengthening around the opening to represent situation of making an opening on existing beam. There were three reinforced concrete beams (150mmx270mmx3000mm) as spesimens, namely a beam without web opening (Code: BU), a beam with web opening which is located on the middle of span of beam (Code: BLLTP), and the other one is a beam with web opening which is located near the support (Code: BLGTP). Compressive strength of concrete was 20 MPa. The beamswere simply supported on 2700mm clear span, and subjected to at two points load were located 900mm from the support. The results were curve of load-deflection, curve of moment-curvature, and crack pattern. The maximum load of BU, BLLTP, and BLGTP were 3717kg, 3581kg, dan 3649kg respectively. The curve of load-deflection and moment-curvature showed that after first crack was happened, the curve of BLLTP and BLGTP were more ramps than curve of BU. The cracks were concentrated on around of openings start at lower load. The results showed that making the web opening without strengthening on existing beam has a little effect on the load capacity of beams (below 5%), but decrease the stiffness of beam significantly.
PEMANFAATAN ABU SEKAM PADI SEBAGAI PENGGANTI SEMEN PADA METODA STABILISASI TANAH SEMEN Idharmahadi Adha
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Sub base course and base course are the layers under the surface course. Generally, materials of sub base course or base course are fine aggregates and coarse aggregates. But some locations in field, sometimes can not be found the aggregates to use as the material construction. Portland cement is always used as the additive material in soil stabilization method, but cost of portland cement is very high. One of the solution is used mixture of rice husk ash and portland cement as the additive material to stabilized of soils. The result of research, showed that mixing of rice husk ash material and portland cement can be able to increase of soil plasticity properties and bearing capacity and shear strength of soils. Based on testing of bearing capacity at 9% prosentage of rice husk ash material and portland cement, with curring time in 28 days, can be recommended that soil stabilization be used as base course in pavement structure of highway engineering, where CBR Laboratory value is 120% in unsoked CBR and 102% in soaked CBR.
MITIGASI BENCANA TSUNAMI DI WILAYAH PESISIR LAMPUNG Dwi Jokowinarno
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Disaster management is a dynamic process, integrated and sustainable effort to increase quality of preventive, preparedness,mitigaton, emergency response, evacuation and reconstruction. Mitigation is strategy to reduce and minimize negative impact of disaster. At least, there are six strategies in tsunami mitigation. Firstly, to protect living, infrastructure and coastal zone environment. Secondly, to increase understanding and participation in mitigation of tsunami. Third, to increase preparedness and awareness of upcoming disaster. Fourth, to increase coordination and institution capacity. Fiveth, to establish law enforcement that can be efective to realize disaster mitigation by mean of making code of conduct that regulate mitigation implementation, to develop guidance of planning and implemetation of disaster protection. Sixth, to push sustainability of economic activity and increasing social wellfare, security, and confort in coastal zone area.
Sampul Muka Jurnal Rekayasa Edisi Desember Tahun 2011 ahmad zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 3 (2011): Edisi Desember Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Sampul Muka Jurnal Rekayasa Edisi Desember Tahun 2011
Daftar Isi Jurnal Rekayasa Edisi Desember Tahun 2011 ahmad zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 3 (2011): Edisi Desember Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Daftar Isi Jurnal Rekayasa Edisi Desember Tahun 2011
KONSEP DESIGN CATALYST DALAM REVITALISASI KAWASAN Studi Kasus Penataan Kawasan Kota Agung Kabupaten Tanggamus Agung Cahyo Nugroho
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 3 (2011): Edisi Desember Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Phisycal intervention in the planning process could be the ‘micro’ intervention, which mean thatthe pysical aspect of infilltration is the growth ‘catalyst’ of the area/environment. Catalyst is oneof the concept for revitalitation strategy in built area/environment. In the concept of urbancatalyst, architectural design could be the catalyst for area/environment planning and designingprocess. This concept give important point for revitalitation process, which mean ‘designarchitectural’ could be the catalyst for revitalitation. Kota Agung as the municipal of KabupatenTanggamus has a significant history as one of important place in South of Sumatra in colonialismera, which is also indicate by its location. This study take as design study with synoptic method asthe metodology of the study. From the analysis process, showed that public space, commercialcenter and beach/waterfront activity could be the catalyst for the growth of Kota Agung. Thisprocess also could reinforce the cultural aspect of the place. Those catalyst could be moresignificant with the forming of linkage system in the area/environment.
PERBANDINGAN NILAI TANAH MENGGUNAKAN MODEL ANALISIS REGRESI BERGANDA DAN JARINGAN SYARAF TIRUAN (Studi kasus: Kelurahan Way Lunik, Ketapang dan Way Laga, Kota Bandar Lampung) Citra Dewi
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 3 (2011): Edisi Desember Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

The characteristics of land value is not linier and high multicolinierity, the methods of landassessment using MRA might resulting less accuracy,Therefore land ANN method to improve thepredicted value quality to be more accurate is required. ANN method could identify the patternsand relationships between linier and non linier independent variables to the dependent variablesthrough the learning process iteratif. The previous explanation encourage the authors tocomparison use MRA and ANN, when applied in Kelurahan Way Lunik, Ketapang and Way LagaBandar Lampung. The modelling results of MRA method is lin-log, while the modeling results ofANN is backpropagation. The influence of independent variables to the land value in ANN modelis better than MRA model. This can be seen in R2 value ANN model is 98.3% and the R2 valueMRA model is 90.1%. The accuracy of ANN model is higher than MRA model. This can be seen inCOV value ANN model is 10.1% and COV value MRA model is 50.2%. The dispersion of ANNmodel is higher than MRA model. This can be seen in COD value ANN method is 7.2% and valueCOD MRA method is 35.3%. The estimation land value of ANN model is closer to the actual valuethan estimation land value of MRA model. This can be seen in PRD value ANN method is 1.00 andthe value of PRD MRA model is 1.07. The comparison result of land value estimation using theMRA and JST shows that the ANN land value estimation is closer to the sample data.
ANALISIS DAMPAK TANGGUL TERHADAP ELEVASI BANJIR SUNGAI NAGARA KALIMANTAN SELATAN Dyah Indriana Kusumastuti
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 3 (2011): Edisi Desember Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Nagara River is a river in South Kalimantan province with extensive swamp area which formsseasonal flood plain and protects downstream area from flooding and salt water intrusion. Theplan for land use change from the swamp area to plantation area involves building dyke on thesides of Nagara River. This research aims to analyze the elevation of Nagara River duringflooding when the swamp area is occupied as an extension of flood plain, compared that resultedfrom the scenario when this area is converted into plantation area which needs dyke on the sidesof the river for flood protection. There are two kinds of scenarios, first only one side of the riverwhich will be build dyke, and second both sides of the river will be built dykes. The analysisinvolved rainfall data analysis using daily module rainfall, design discharge analysis usingRational Method and hydraulic analysis using HEC-RAS software with one-dimensional steadyflow. The result shows that using dyke at elevation +11.00 m, the increase of water level is notsignificant while one side of the river is protected by dyke. An increase of 30 cm of water elevationis obtained using scenario of both sides are protected by dykes. The increase of water level maycause flooding in the area located at the upstream and downstream of the plantation area.

Page 9 of 25 | Total Record : 246

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