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All Journal JURNAL KARYA TEKNIK SIPIL
Purwanto Purwanto
Departemen Teknik Sipil Jl.Prof.Ir. Soedarto, Tembalang Semarang. 50275
Civil Engineering, Building, Construction & Architecture

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PENGARUH RASIO JARAK AGREGAT TERHADAP KUAT TEKAN BETON MORTAR Bayu Asmoro; Moh. Wahyudi; Han Ay Lie; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 2, Nomor 3, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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In this research used  aggregate with the diameter of 2 cm and heigth of 5 cm, with the number of 2, is being plant to a mortar concrete, That have a cube and  10 x10 x5cm size, with the position of the aggregate is being variant from vertical to horizontal planted with the ratio of the distance between the two aggregate is 4 cm and 3 cm from its center of gravity point.Making mortarconcrete specimens using Ordinary Portland Cement (OPC) using the comparison 1 Pc: 2.75 of sand and 0.485 of water cement ratio conforming with ASTM C 109 (Compressive Strength of Hydraulic Cement mortars) standard. The Test is being held with used of compression test which is Hung Ta with the compressive and displacement data out put is being recorded by data logger and LVDT (Linear Variable Displacement Transducer). The results from research show how different ratio of the distance affect the compressive strength. Specimen with the 4 cm distance ratio horizontal position has highest value strength of concrete mortar. The crack of model is columnar crack following contour  compressive stress and perpendicular tensile stress.
STUDI KELAYAKAN PEMANFAATAN CAMPURAN FLY ASH DAN TANAH PUTIH SEBAGAI SEMEN ALTERNATIF Samuel Parluhutan; Gilbert Fernando; Purwanto Purwanto; Yulita arni priastiwi
Jurnal Karya Teknik Sipil Volume 7, Nomor 2, Tahun 2018
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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ABSTRAKMortar merupakan campuran semen, pasir, dan air dengan proporsi tertentu. Pada umumnya bahan ikat campuran yang digunakan adalah semen. Unsur utama pembentuk semen itu sendiri adalah silika, alumina, dan kalsium. Kandungan silika dan alumina pada semen dapat pula diperoleh dari fly ash sedangkan kandungan kalsium dapat diperoleh dari tanah putih. Dalam penelitian ini akan dibuat mortar yang menggunakan campuran fly ash, tanah putih, dan pasir yang akan diteliti mengenai kuat tekan mortar tersebut. Variasi perbandingan fly ash dan tanah putih dengan persentase masing - masing sebesar 0%-100%, 25%-75%, 50%-50%, 75%-25%, dan 100%-0% dalam campuran mortar. Bentuk benda uji yang digunakan berbentuk kubus berukuran 5 cm x 5 cm x 5 cm. Mortar dibuat dengan metode adukan manual. Hasil penelitian menunjukkan adanya pengaruh persentase tanah putih dan fly ash terhadap kuat tekan mortar. Kuat tekan tertinggi pada umur 28 hari ditunjukkan oleh varian mortar dengan persentase fly ash dan tanah putih 50%-50%, yaitu sebesar 2,218 kg/cm2. Nilai kuat tekan mortar yang menggunakan fly ash dan tanah putih tersebut masih sangat rendah, sehingga campuran fly ash dan tanah putih tidak dapat digunakan sebagai pengganti semen bahan konstruksi.
PERENCANAAN JEMBATAN SUNGAI SIKATAK UNDIP Fuad Kamal Azmi; Estiana Kussanty; Djoko Purwanto; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 7, Nomor 4, Tahun 2018
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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ABSTRAKJembatan Sikatak yang berlokasi di Kampus Undip Tembalang dibangun untuk menghubungkan Jalan Prof. Soedharto dan Jalan Lingkar Undip yang terputus oleh Sungai Sikatak. Dengan pembangunan jembatan ini diharapkan dapat mengakomodasi pergerakan arus lalu lintas dari Jalan Lingkar Undip menuju Jalan Prof Soedharto tanpa harus memutar arah ataupun memasuki Kampus Undip. Dalam penyusunan Tugas Akhir ini direncanakan jembatan rangka baja tipe Truss Arsch Bridge dengan bentang 60 meter dan lebar 11 m ( termasuk lebar trotoar pada sisi kanan dan kiri jembatan 1,5 m). Konfigurasi jalur pada jembatan ini adalah 2 lajur dua arah tak terbagi (2/2 UD) dengan masing – masing lebar lajur 3,5 m.Standar yang dipakai untuk merencanakan jembatan ini mengacu pada SNI 1725 2016 (Pembebanan untuk Jembatan), SNI 2833 2008 (Standar Perencanaan Tahan Gempa untuk Jembatan) dan SNI 1729 2015 (Spesifikasi Bangunan Baja Struktural).Tahap awal perencanaan struktur atas adalah perencanaan sandaran, trotoar, dan lantai jembatan. Kemudian dilanjutkan perencanaan gelagar memanjang dan melintang, sekaligus perhitungan shear connector. Memasuki tahap konstruksi rangka pemikul utama, dilakukan perhitungan beban – beban yang bekerja, kemudian dianalisis dengan menggunakan program SAP 2000. Setelah didapatkan gaya – gaya dalam yang bekerja dilakukan perhitungan kontrol tegangan dan perhitungan sambungan.Setelah selesai analisis struktur atas jembatan, dilakukan analisis perencanaan struktur bawah jembatan ( abutment, wing wall, plat injak, dan pondasi). Dari data tanah yang ada, substruktur jembatan tersebut menggunakan pondasi bore pile dengan kedalaman 12 m. Pondasi bore pile dipilih karena karakteristik tanah di lapangan lebih sesuai dan efisien dengan podasi tersebut. Pada setiap perencanaan komponen struktur dilakukan kontrol kapasitas terhadap beban yang bekerja meliputi momen, gaya geser, gaya aksial, dan gaya lateral. Adapun tahap terakhir dari perencanaan Jembatan Sikatak adalah desain perkerasan .yakni meliputi penentuan jenis dan tebal perkerasan.
STUDI EKSPERIMENTAL PENGARUH INKLUSI BAJA TERHADAP PERILAKU MORTAR-INKLUSI Nauval Rabbani; Mona Dwi Anggraini; Purwanto Purwanto; Yulita Arni P
Jurnal Karya Teknik Sipil Volume 6, Nomor 3, Tahun 2017
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Beton merupakan material komposit yang tersusun dari mortar dan agregat kasar, serta disatukan oleh semen melalui proses hidrasi. Kuat tekan material beton sangat tergantung dari karakteristik material penyusunnya, dan kekuatan lekatan daerah peralihan antara mortar dengan permukaan agregat kasar yang disebut Interfacial Transition Zone (ITZ). Penelitian mengenai mortar inklusi sudah banyak dilakukan, namun masih sedikit penelitian yang memodelkan inklusi dengan baja. Untuk mengetahui lebih lanjut mengenai pengaruh ITZ baja terhadap mortar inklusi, maka dalam penelitian ini menggunakan beberapa macam mutu mortar yaitu dengan kuat tekan 20, 40, dan 60 MPa. Benda uji menggunakan ukuran 150 x 150 x 50 mm dengan inklusi silinder baja tipe BJTP-40 berdiameter 25 mm dan 32 mm. Silinder baja diletakkan tepat di pusat titik berat benda uji. Hasil penelitian menunjukkan bahwa mutu mortar dan diameter inklusi sangat mempengaruhi perilaku dari benda uji. Kuat tekan mengalami penurunan diakibatkan oleh semakin luasnya diameter inklusi, sedangkan angka deformasi menurun dengan kenaikan pada nilai mutu mortar. Pengamatan yang dilakukan saat pengujian menunjukkan bahwa pola retak yang terjadi adalah columnar yang terjadi di daerah inklusi yang merupakan daerah terlemah dikarenakan oleh ITZ.
STUDI EKSPERIMENTAL PENGARUH PENAMBAHAN ABU SEKAM PADI NANO DAN BAHAN TAMBAH SUPERPLASTICIZER TERHADAP KUAT TEKAN BETON Putri Ardiyati; Mira Budi Octaviani; Purwanto Purwanto; Parang Sabdono
Jurnal Karya Teknik Sipil Volume 2, Nomor 4, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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This research aimed to investigate effect of using nano materials rice husk ash and superplasticizer admixture to concrete compressive strength. Nano rice husk ash used as subtitute of pozzolan portland cement. Production of nano rice husk ash use Planetary Ball Milling with  duration of  milling  for 1 hour. To determine effect of using nano materials rice husk ash dan superplasticizer admixture used variation percentage of materials nano rice husk ash such ash 5%, 10%, and 15% with or without superplasticizer admixture. Tests were conducted  at 28 days with uniaxial loading (one-way). Result of this research indicate normal concrete without substitution of nano rice husk ash and without superplasticizer have highest of concrete compressive strength. Concrete with rice husk ash decreased in compressive strength because of rice husk ash absorb much water and increase the length of  hydration process of cement in concrete mix. Although there is a decrease through this research is expected, nano techonology in civil engineering can more developed.
PENGARUH KOMPOSISI NANO SEMEN TERHADAP KUAT TEKAN MORTAR Dion Aji Fadlillah; Frisky Sustiawan; Han Ay Lie; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 3, Nomor 4, Tahun 2014
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

The micro voids in the cement paste of cementitious material drastically reduce the load-carrying capacity of the element, due to the reduction in area. On the other hand, the weak interface between aggregates and mortar induces micro-crack initiation and promote crack propagation. It therefore becomes curial to reduce the voids in the mortar, and promotes a better hydration degree of cement. A method that has been proven effective is the use of nano-cement particles. The smaller cement particles will result in a better hydration process, and create less large ettringites and calcium hydrates. This research work studied the effect of nano-cement percentage in the mortar mix by the substitution method. The ratio in weight of the nano-cement with respect to the normal cement ranged from 0%, 20%, 40%, 60%, 80%, to 100%. The specimens sized 50 × 50 × 50 mm were tested at the age of 28 days to obtain their compression strength. The cement-to-sand proportion was 1 to 2.75, while a water-cement-ratio of 0.485 was maintained throughout the experiments. Two cement types, PCC (Portland Composite Cement) and PPC (Portland Pozzolane Cement), all Indonesian based products, were compared to obtain a picture of the overall cement condition in Indonesia, and the effectiveness of the nano-cement use to each of the types.
STUDI EKSPERIMENTAL PENGARUH TEGANGAN TEKAN SELAMA PROSES PRODUKSI TERHADAP KUAT TEKAN DRY CONCRETE M. Mirza Abdillah Pratama; Vemi Widoanindyawati; Han Ay Lie; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 3, Nomor 4, Tahun 2014
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

Dry concrete is basically a cementitious material, consisting of aggregates imbedded in a cement matrix that function as the binding agent. The water cement factor during this production is customary kept low, since from the economic point of view, speed in production is favored. A low water-cement-factor will result in a faster unmolding of elements. As a consequence, the probability of the hydration process is not at optimum. A technique of optimizing the hydration process is to apply a compression stress to the dry concretes, during the hydration stage. This stress is aimed to reduce the air voids in the mixture and to enable the entrapped water within the mortar to optimize the reaction with the cement. The application of compression stress is not only freed the entrapped water, but also creates a more dense material so it will provides a better performance of the dry concrete. This study uses 2 types of mix design with a water-cement ratio of 0.4 and 9 types of compressive stress variations during the production process from 0 MPa to 40 MPa. The experimental test showed that the compressive stress during the production process affect the compressive strength of dry concrete. The greater compressive stress given during the production process increase the compressive strength of the dry concrete. This increase occurred gradually until it reaches the optimum compressive stress, which is 35 MPa. The rate of increase in compressive strength and the optimum compressive stress on both the mix design is in the same point, it is due to both the mix design using the same water-cement ratio.
STUDI EKSPERIMENTAL PENGARUH TEMBAGA TERHADAP KUAT TARIK BAJA Muhammad Jailani Muslim; Ageng Habrur Fahmi; Purwanto Purwanto; Arif Hidayat
Jurnal Karya Teknik Sipil Volume 4, Nomor 4, Tahun 2015
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Steel is a metal alloy composed of iron as main element and carbon as an element of reinforcement. Carbon element play a role in improving the quality of the steel. Combined steel to can fix the ability of tensile strength the steel. In this research, combine carbon steel with copper. Copper alloy steel expected to increase the tensile strength of the steel. In this research we use sample with the non alloy steel (TP), alloy steel with 0,5% copper alloy (FeCu-5), and alloy steel with 1,0% copper alloy (FeCu-10), testing that will do in the form of composition testing, hardness testing, and tensile testing. The steel tensile testing we get the data of stress,strain,modulus elasticity,and ductility. The result obtaine from this research is 1% copper alloy increases the ultimate tension by 42,42% compared with non alloy steel. While there is decrease in the ultimate strees by 0,5% copper alloy by 30,98% compared with non alloy steel.
PERENCANAAN GEDUNG PAVILIUN GARUDA II RUMAH SAKIT DOKTER KARIADI SEMARANG Bernard Bayu Baskoro; Daniel Erlanda; Nuroji Nuroji; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 2, Nomor 2, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Abstract

Design of Paviliun Garuda II  dr. Kariadi Hospital Building, Semarang is designed using the Special Moment Frame System (SMFS). With the election of SMFS system expected to behave ductile structure, because ductile structure not only has large energy but also has a large caapacity in the resist earthquake loads. In system of SMFS, we have to use the concept of strong column weak beam in which the vertical elements of the structure (column) must be made stronger than the horizontal elements of the structure (beam), so that the plastic joints formed first on the beam. In addiction, beam-column joint must also be properly designed to prevent the collapse first. The technique of design and analysis structure, by using the SAP 2000v14 program, will obtain internal forces used to calculate the number of the reinforcements needed by the structure. It is in accordance with Indonesian National Standard or SNI as the main guidance in design of Paviliun Garuda II  dr. Kariadi Hospital Building, Semarang.
STUDI EKSPERIMENTAL PENGARUH TEGANGAN TEKAN SELAMA PROSES PRODUKSI TERHADAP KUAT TEKAN DRY CONCRETE M. Mirza Abdillah Pratama; Vemi Widoanindyawati; Han Ay Lie; Purwanto Purwanto
Jurnal Karya Teknik Sipil Volume 3, Nomor 4, Tahun 2014
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (452.617 KB)

Abstract

Dry concrete is basically a cementitious material, consisting of aggregates imbedded in a cement matrix that function as the binding agent. The water cement factor during this production is customary kept low, since from the economic point of view, speed in production is favored. A low water-cement-factor will result in a faster unmolding of elements. As a consequence, the probability of the hydration process is not at optimum. A technique of optimizing the hydration process is to apply a compression stress to the dry concretes, during the hydration stage. This stress is aimed to reduce the air voids in the mixture and to enable the entrapped water within the mortar to optimize the reaction with the cement. The application of compression stress is not only freed the entrapped water, but also creates a more dense material so it will provides a better performance of the dry concrete. This study uses 2 types of mix design with a water-cement ratio of 0.4 and 9 types of compressive stress variations during the production process from 0 MPa to 40 MPa. The experimental test showed that the compressive stress during the production process affect the compressive strength of dry concrete. The greater compressive stress given during the production process increase the compressive strength of the dry concrete. This increase occurred gradually until it reaches the optimum compressive stress, which is 35 MPa. The rate of increase in compressive strength and the optimum compressive stress on both the mix design is in the same point, it is due to both the mix design using the same water-cement ratio.
Co-Authors Ageng Habrur Fahmi Arif Hidayat Bayu Asmoro Bernard Bayu Baskoro Daniel Erlanda Darma Adi Syaputra Dion Aji Fadlillah Djoko Purwanto Elfiranahla Chandra Dewi Estiana Kussanty Farizka Rahman Nugroho Frisky Sustiawan Fuad Kamal Azmi Gilbert Fernando Han Ay Lie Han Ay Lie Han Ay Lie Han Ay Lie Kartika Trisna Apsari M. Mirza Abdillah Pratama Mira Budi Octaviani Moh. Wahyudi Mona Dwi Anggraini Muhammad Bahruddin Ridho Paradipta Muhammad Jailani Muslim Nauval Rabbani Nuroji Nuroji Nuroji Nuroji Parang Sabdono priyo Nugroho P. Putri Ardiyati Ridho Paradipta Rizqi Maulana Wijaya Samuel Parluhutan Vemi Widoanindyawati Yulita Arni P Yulita Arni Priastiwi