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INDONESIA
Jurnal Rekayasa
Published by Universitas Lampung
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Articles 9 Documents
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Search results for , issue "Vol 15, No 2 (2011): Edisi Agustus Tahun 2011" : 9 Documents clear
PENGARUH PROSENTASE PENAMBAHAN SERAT TERHADAP KUAT TEKAN DAN KUAT TARIK BELAH BETON RINGAN Edy Puwanto
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Beton merupakan bahan konstruksi paling banyak digunakan pada saat ini, karena dipandang memiliki beberapa kelebihan dibandingkan bahan-bahan konstruksi lain. Kelebihan utama beton adalah kemampuan menahan gaya tekan yang tinggi. Namun beton juga memiliki kelemahan yakni berat meter kubiknya yang cukup besar dan kekuatan tarik yang rendah dan bersifat getas (brittle). Hal tersebut dapat diperbaiki dengan penggunaan beton ringan dan penambahan serat pada adukan beton. Beton ringan diperoleh dengan mengganti agregat kasar dengan agregat yang lebih ringan, dalam penelitian ini digunakan ALWA. Penelitian ini mengevaluasi seberapa besar kemampuan beton ringan berserat kawat galvanis terhadap pengujian mekanik berupa kuat tekan dan kuat tarik belah. Benda uji pada penelitian terdiri dari benda uji silinder diameter 100 mm tinggi 200 mm untuk pengujian kuat tekan dan kuat tarik belah. Variasi serat yang digunakan yaitu 0% ; 0,3% ; 0,75% ; 1% dengan panjang serat 60 mm diameter 1 mm. Benda uji berjumlah 12 buah untuk pengujian kuat tekan dan 12 buah untuk pengujian kuat tarik belah dan masing-masing 3 buah untuk setiap variasi serat. Hasil pengujian kuat tekan, nilai untuk masing-masing variasi serat 0% ; 0,3% ; 0,75% dan 1% berturut-turut adalah 21,58 MPa ; 24,00 MPa ; 24,81 MPa dan 25,01 MPa. Dengan peningkatan kuat tekan optimum terjadi pada variasi serat 1% yaitu 15,89%. Hasil pengujian kuat tarik belah, nilai untuk masing-masing variasi serat 0% ; 0,3% ; 0,75% dan 1% berturut-turut adalah 2,23 MPa ; 2,76 MPa ; 3,50 MPa dan 3,61 MPa. Dengan peningkatan kuat tarik belah optimum terjadi pada variasi serat 1% yaitu 61,90%. Dapat disimpulkan bahwa dengan penambahan serat kawat galvanis ke dalam adukan beton ringan hanya sedikit meningkatkan kuat tekan beton ringan namun meningkatkan kuat tarik belah beton sesuai dengan peningkatan jumlah volume fraksi serat dan mengubah beton dari bahan yang getas menjadi bahan yang lebih daktail.
Sampul Muka Jurnal Rekayasa Edisi Agustus Tahun 2011 Zakaria, Ahmad
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Sampul Muka Jurnal Rekayasa Edisi Agustus Tahun 2011
Daftar Isi Jurnal Rekayasa Edisi Agustus Tahun 2011 Ahmad Zakaria
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Daftar Isi Jurnal Rekayasa Edisi Agustus Tahun 2011
TRANSFORMASI PADA RUANG PUBLIK KOTA MELALUI KONSEP DESIGN CATALYST M. Subhi Yuda Wibawa; William Ibrahim
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Humans as social beings need interaction with the others to show the existence of oneself and the actualization of the surroundings. The need for this is that basically creates social spaces on the order of social life. Social space as a public area for individuals or community groups (communal) to meet each other and socialize. Diversity of community groups who use public space as a social space, making it vulnerable to the interface of public space needs and activities of community groups. The existence of government policy (political), economic activity, social, cultural to participate in shaping the public sphere in the context of transformation. The strength of a design is produced to establish the context of the activities and behavior of various social groups that interact in a public space. Architectural design as a catalyst of change in the function of public spaces to produce a positive reaction from its use for the life of society and social order for the visual character of the surrounding area and as an essential overview of the development area.
PERBANDINGAN KUAT TEKAN BETON RINGAN DENGAN METODA RANCANG-CAMPUR ACI DAN DREUX-CORRISE Ratna Widyawati
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Lightweight concrete is one of solving problems to deficiency or loss that is about the size of the dead load weight of the concrete itself. Generally, lightweight concrete has the same mix-design with normal concrete, except that coarse aggregate in lightweight concrete its density must be reduced. One of the lightweight aggregate that has been produced in bulk is ALWA (Artificial Light Weight Aggregate coarse), which is lightweight aggregate from the burning of clay. Because the aggregate is light, then the aggregate can be used as coarse aggregate in lightweight concrete mixtures for building structures. There are several kinds of lightweight concrete mix design. The purpose of this research is compare of compressive strength of lightweight concrete aggregates ALWA with the ACI Methods and Dreux-Corrise Method. Specimens consist of 15 pieces of concrete cylinders (d = 150 mm, t = 300 mm) for lightweight concrete ALWA with the ACI Method. Treatment of samples was done by soaking and aerated for 7 days. Compressive strength testing performed on specimens aged 28 days. There are 3 specimens for 3 days, 7 days and 14 days for compressive strength, and there are 6 speciments for 28 days compression test. The results showed 28 days compressive strength of Dreux-Corrise Method has increased significantly by 35.36% from 14 days compressive strength. While the concrete compressive strength of 28 days with ACI method only increased by 1.92% from 14 days compressive strength. Value of compressive strength at Dreux-Corrise method is higher than the ACI method that is equal to 16.37% in the same targeted of 24.5 MPa.
KAJIAN KARAKTERISTIK MEKANIK ROLLER COMPACTED CONCRETE (RCC) SEBAGAI BAHAN PERKERASAN JALAN Sukmawan Hendriyanto
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 2 (2011): Edisi Agustus Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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RCC concrete pavement is concrete pavement that has durability, economic value, long life and low maintenance service life. In this study conducted in the field compaction with baby roller more or less as much as 3-5 times the trajectory, and retrieval of test specimen cubes (10x10x10) and beam (10x10x30), with a concrete cutting tools. Taking a test specimen in the laboratory of conventional concrete cubes (15x15x15). The composition of mixtures used were water: sand: split: cement is 108:811:1217:300 (kg/m3). Variations in the age of treatment (7,14,21 and 28 days), and performed two tests, namely: the testing of compressive strength and lentur.Hasil tensile strength showed that the mixture of the same compressive strength and flexural strength RCC is higher than conventional concrete., more economical, faster utilization after the implementation of the work. Compressive strength obtained at 28 days was 29.25 MPa and 5.14 MPa flexural tensile strength, is still included in the range required by the ACI (American Concrete Institute) that the range of tensile strength for RCC split between 400 (2.75 MPa) and 600 psi (4.13 MPa) at 28 days, for compressive strength are eligible for RCC mixtures where, according to the specifications for RCC of the PCA (Portland Cement Association) where the requirements are between 28 MPa - 69 MPa.
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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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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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.

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