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Jurnal Rekayasa
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Articles 246 Documents
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PENGEMBANGAN RUANG ENCLOSURE JALAN DI KAWASAN KOMERSIAL, BANDAR JAYA, LAMPUNG TENGAH Panji Kurniawan
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

When thinking of a city, the easiest thing that can be recorded from that city is the activity in its streets in which the city’s all activities can be reflected in its external performance through public open space which in this case is a street. In fact, the lively condition of a city can be measured from its streets that form the structure of the city. Proklamator Raya, Bandar Jaya, is a street that forms the city structure of Bandar Jaya. This street is not only as a primary artery street of the citybut also in a wider scale as transportation line of trans-Sumatera. Therefore, this street has high complexity seen from vehicle intensity, activity and other interest. Commerciality is one activity that dominates this area. As a generator, a street becomes the easiest access for economic sectors that become a logic consequence. Unfortunately, the development is imbalance with its existence in a wider context. The spreading of commerciality concentrated along a street, the decreasedattention upon green areas, and the heaps of signage without urban planning development are the influential problems for the quality of the area. The elements should thus be present with a good composition in order to enhance the taste toward the space of Proklamator Raya Street. Referring to the taste of the space, this is inseparable with the elements of the forming of street walls and street space that leads to the enclosure of the space. Therefore, this study aims at (1) analyzingelements that form enclosure in Proklamator Raya Street; (2) analyzing the quality of enclosure; and (3) giving direction of enclosure of street space that fits Proklamator Raya Street as a commercial area in Bandar Jaya. The research paradigm used in this study was rationalistic qualitative, emphasizing on the understanding about problems in the field based on real condition. Analysis was done with dialoging the element data of the forming of street wall (2 vertical dimensions) and street space dimension (2 horizontal dimensions) that finally form street section with different scales. The data were then dialoged with theory of ideal enclosure. The results of this study showed that there were two factors that affected the quality of an enclosure of road space were (1) direct influential factors comprising (a) setback and elements’ height (b) fixedelements’ type, pattern, height and layout (c) moving elements that form street wall and (2) indirect influential factors comprising (a) the present of land use and (b) circulation pattern in the area Keywords: Street, Enclosure, Street Wall and Street Space.
STUDI KUAT TEKAN BETON RINGAN DENGAN METODA RANCANG-CAMPUR DREUX-CORRISE Ratna Widyawati
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

Concrete as a civil building construction materials have a deficiency or loss that is about the size of the dead load weight of the concrete itself. Dead load on the building structure can be minimized by the use of lightweight concrete. To get a lightweight concrete that meets the quality or value of concrete compressive strength, is strongly influenced by the selection of coarse aggregate and mix proportion of concrete used. Concrete is called lightweight concrete if volume weight is 1400-1850 kg/m3 (ACI 213R-79). The purpose of this research is to investigate the values of compressive strength of lightweight concrete aggregates ALWA with the Dreux-Corrise Method. Specimens consist of 15 pieces of concrete cylinders (d = 150 mm, t = 300 mm) for lightweight concrete ALWA with the Dreux-Corrise 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 average for compressive strength are 9,38 MPa; 7,86 MPa ; 13,30 MPa dan 20,59 MPa for 3 days; 7 days; 14 days and 28 days respectively. The average value of the compressive strength obtained from the Dreux-Corrise Method was 20,59 MPa (28 days) lower than targeted of 24,5 MPa.
CORRELATION BETWEEN RICE HUSK ASH AS SUBSTITUTION MATERIALS THE AMOUNT OF CEMENT AND PROPERTIES OF HIGH STRENGTH FLOWING CONCRETE Surya Sebayang
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April 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 for vibration to reduce construction cost and reducing construction time. High strength flowing concrete in this research used rice husk ash as substitution material the amount of cement. The properties investigated are workability, concrete setting time, and compression strength.Proportion of material for concrete determined according to ACI 211-4R-1993 and combine with Hashimoto method. The substitution of rice husk ash to the concrete are 0 %, 3%, 6%, 9%, 12% and 15% of the cement content. The test result indicated that effect of rice husk ash in fresh concrete was increased the workability of the concrete. Addition of rice husk ash was made fresh concrete enough cohesiveness without causing segregation. Addition of rice husk ash was increased the initial and final setting time. The cylinder compression strength of rice husk ash flowing concrete at 7day and 14 days was lower than compression strength of flowing concrete without rice husk ash at the same days. The optimum strength of rice husk ash flowing concrete was 44,44 MPa at 56 days age in 12 % presence of rice husk ash.
PENGARUH JUMLAH DATA DAN LOKASI TRAFFIC COUNT TERHADAP ESTIMASI MATRIKS ASAL-TUJUAN KOTA BANDAR LAMPUNG BERDASARKAN ARUS LALU LINTAS Wiwit Tri Rahayu
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 15, No 1 (2011): Edisi April Tahun 2011
Publisher : UNIVERSITAS LAMPUNG

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Abstract

The more data traffic count using in process with unconventional methods, will estimate the better OD matrix, but it spend a lot of times, effort, and cost. Efficiency can be done by finding the amount of data and point the exact location, making it more effective in terms of time and costs but still produce an optimal estimate of O-D Matrix. The use of 42 traffic count produce estimate of OD Matrix model (100%) with R-square is 0,3114 for the current level. Scenarios is done by selecting roads with the lowest flow rate, 2 data for each scenario. Selection of input data traffic flow yield of the 13 scenarios, each of scenarios produce estimate of O-D Matrix with variation Rsquare. R-square of 0,9517 for linear trend line shows the amount of data has a tremendous influence in the decline in the value of R-square for the current level. Inconsiderably the condition of dependence, inconsistency, and the proportion movement make estimate of O-D Matrix has not been seen significantly. The optimum number of traffic count data is about 32 traffic count data, or about 76,19% of the total data traffic count (100%). Roads that could be recommended to input data to estimate O-D Matrix traffic count of more effective and efficient based on the study of the road with a large amount of movement of vehicles, roads with a large proportion of the movement of traffic between the zones, and roads are not only through private vehicles but also by public transport.
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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Abstract

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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Abstract

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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Abstract

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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Abstract

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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Abstract

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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Abstract

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.

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