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All Journal Mekanika: Majalah Ilmiah Mekanika Matriks Teknik Sipil METAL : Jurnal Sistem Mekanik dan Termal
Wibowo Wibowo
Pengajar Fakultas Teknik Jurusan Teknik Sipil Universitas Sebelas Maret Surakarta
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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PENGARUH PENAMBAHAN SERAT GALVALUM PADA BETON RINGAN DENGAN TEKNOLOGI FOAM TERHADAP KUAT LENTUR, TOUGHNESS, DAN STIFFNESS Purnawan Gunawan; Wibowo Wibowo; Dewana Istiyan Primasatya
Matriks Teknik Sipil Vol 2, No 2 (2014): Juni 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (523.266 KB) | DOI: 10.20961/mateksi.v2i2.37458

Abstract

surrounding environment. Lightweight concrete foam is made of concrete without coarse aggregate in the mix with added foam material agent (liquidfoam). The purpose of this study was to determine how much influence the addition of fiber galvalum the flexural strength, toughness, and stiffnessof lightweight concrete foam galvalum fiber. The method used in this study is an experimental method that is then theoretically analyzed. Value offlexural strength on fiber 0 %, 0.25 % , 0.5, and 1 % , respectively, 104.28 t/m2 ; 110.31 t/m2 ; 182.99 t/m2 , and 134.98 t/m2 , at 0.5fibers % an increase in flexural strength of 75.48 % . Toughness values occurred in 0.5 % with the addition of fiber 1407 Nmm value unchangedat 121.92 % . Galvalum stiffness with the fiber content of 0% , 0.25 % , 0.5 % , 1 % were tested at 28 days is 5001.65 N / mm ; 7277.67N / mm ; 8472.88 N / mm and 7957.14 N / mm. The addition of the fiber content of 0.5 % yield Stiffness value of 69.40 % compared tothe lightweight foam concrete without fibers.
EVALUASI KINERJA STRUKTUR GEDUNG BERTINGKAT DENGAN ANALISIS RIWAYAT WAKTU TERHADAP DRIFT DAN DISPLACEMENT MENGGUNAKAN SOFTWARE ETABS (STUDI KASUS : HOTEL DI DAERAH KARANGANYAR) Firman Andriyanto; Agus Setiya Budi; Wibowo Wibowo
Matriks Teknik Sipil Vol 2, No 1 (2014): Maret 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v2i1.37476

Abstract

Indonesia lies between severally tektonik's plate universalizes, which is Australian Eurasian plate one moves to aim northern, moving Pacific plateto aim Eurasia's northwest and plate, so often experiences earthquake. Sighted by geological, Indonesian archipelago lies on appointment 2 mainearthquake bands, which is earthquake Sirkum Pacific and Alpide Transasiatic's earthquake band, in consequence Indonesia includes in ringband damp down Pacific (ring of fire). Ring damps down Pacific constitute world active mountain series causative Indonesian experience earthquakefrequency that adequately frequent. It bears out the importance for review strategical earthquake charges be in contemplation structure designin anticipation if happening earthquake. In common structure analysis to earthquake is divided as 2 kinds, which is static analysis and dynamicanalysis (respon spectrum analysis and time history analysis). This research has a purpose to know building structure performance bases drift anddisplacement. Observational method that is utilized is analisis dynamic time history by use of software ETABS. Buildings structure evaluationby give earthquake record note El Centro, Chi Chi Taiwan, Kobe Japan and Indonesian Sumatera. If building was given by charges El Centro'searthquake, Chi Chi Taiwan, Kobe Japan and Indonesian Sumatera is gotten safe to inspire angles nominal basic. Helper bounds performanceand ultimit's bounds performance that ineligible appropriate SNI 1726 2002 sections 8.1 and sections 8.2 is El Centro's earthquake record andIndonesia Sumatera. According to ATC-40, if building was given by charges El Centro's earthquake, Chi Chi Taiwan, Kobe Japan and IndonesianSumatera therefore building performance comes in category IO (Immediate Occupancy).
PENGARUH PENAMBAHAN SERAT POLYPROPYLENE PADA BETONRINGAN DENGAN TEKNOLOGI FOAM TERHADAP KUAT TEKAN, KUAT TARIK BELAH DAN MODULUS ELASTISITAS Purnawan Gunawan; Wibowo Wibowo; Nurmantian Suryawan
Matriks Teknik Sipil Vol 2, No 2 (2014): Juni 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v2i2.37455

Abstract

The density of concrete is one of aspect which is calculated when planning a building framework because it influencing the weighting calculation. Forthat reason, there are many kinds of research on the lightweight concrete and one of them is making a lightweight concrete using foam technology.Foam lightweight concrete is made by adding foam agent which consist of spectafoam, harder mild, and polymer into a mortar mix. Nowadays, theusing of lightweight concrete still directed only to a non-structural concrete because generally a lightweight concrete has maximum compressivestrength at 15 MPa. The solution to improve this foam lightweight concrete's strength is by adding fiber to the mixing in form of polypropylene Themethod used was experimental observations and theoretical analysis then performed to support the conclusion eventually. The specimen is in form ofcylinder with diameter of 15 cm and height of 30 cm for testing the modulus of elacity, compressive strength, and the split tensile strength. Thisexperiment using CTM (Compression Testing Machine) tool. The result of the research is the increase of the value of foam lightweight concrete'scompressive strength, split tensile strength, and modulus of elasticity on the polypropylene fiber addition rate of 0.75% from the concrete's volumeweight. Fiber additional rate of 0.75% resulting the increase of compressive strength, split tensile strength, and the modulus of elasticityconsecutively 27.93%; 60.38%; and 44.31% compared to the foam lightweight concrete which has no fiber.
EVALUASI KINERJA STRUKTUR PADA GEDUNG BERTINGKAT DENGAN ANALISIS DINAMIK RESPON SPEKTRUM MENGGUNAKAN SOFTWARE ETABS ( STUDI KASUS : HOTEL DI WILAYAH KARANGANYAR ) Muhammad Luthfi Rifai; Agus Setiya Budi; Wibowo Wibowo
Matriks Teknik Sipil Vol 2, No 1 (2014): Maret 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (801.583 KB) | DOI: 10.20961/mateksi.v2i1.37464

Abstract

Indonesia is located at the junction of the earth's tectonic plates, namely the Eurasian tectonic plates, the Pacific, the Philippines, andIndo - Australian. Besides, Indonesia also has many volcanoes which are still active, so that Indonesia is a country that is prone toearthquakes. The earthquake effects on damage to the building structure. Even it effects in fatalities because of the falling debris.When an earthquake occurs, it is expected that the building can withstand earthquake forces at a certain level without damage to thebuilding so it avoids earthquake victims. There are two analytical approaches that can be used to calculate the lateral loads on theearthquake. Those analysis are a static analysis and dynamic analysis. Dynamic analysis is used for the high buildings which has alot of levels. This analysis consists of dynamic response spectrum analysis and time history dynamic analysis. This study aims to investigatethe building structure performance based on displacement and drift. The method that is used in this study is the dynamic responsespectrum analysis by using ETABS. The maximum displacement of the building in the X direction is 0.0465 m and in theY direction is 0.0634 m, so that if it is viewed from the limit performance and the limit ultimate performance, it is categorized as aeligible building (safely) in accordance with SNI 3-1726-2002. The maximum total drift in the X direction is 0.00090 and the Ydirection is 0.00123. The maximum total inelastic drift in the X direction is 0.00077 and the Y direction is 0.00103, so thatwhen it is viewed according to ATC - 40, it is included in the level immediate occupancy category.
TINJAUAN KUAT TEKAN DAN MODULUS ELASTISITAS BETON DENGAN MENGGUNAKAN LIMBAH BATU CANDI SEBAGAI PENGGANTI AGREGAT KASAR Winda Gusanti; Kusno Adi Sambowo; Wibowo Wibowo
Matriks Teknik Sipil Vol 2, No 2 (2014): Juni 2014
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.975 KB) | DOI: 10.20961/mateksi.v2i2.37435

Abstract

Nowadays the use of concrete is increasing but the concrete raw materials fulfillment is decreasing. In this case, one of alternative is to be replacedthe coarse aggregate with lava stone waste obtained from the production residue of natural stone craftsmen in Sambirejo, Prambanan,Yogyakarta.The purpose of this research was to determine the concrete compressive strength, modulus of elasticity of concrete with lava stone wasteas substitute for coarse aggregate, and determine the maximum ratio of lava stone waste as the coarse aggregate in terms of compressive strength andmodulus of elasticity appropriate quality targeted.The method used in this research is the experimental method. Samples form is made as cylinder with 15 cm of diameter and 30 cm of high.Targeted quality of concrete is 25 MPa with lava stone percentage levels of 0%, 20%, 40%, 60%, 80%, 100% replaces the coarse aggregate.The compressive strength of concrete decreased at comparable levels with the addition of lava stone as the coarse aggregate. Value of the averagecompressive strength of concrete at 28 days was 36,768 MPa (lava stone 0%); 31,300 MPa (lava stone 20%); 28,283 MPa (lava stone 40%);27,152 MPa (lava stone 60%); 25,266 MPa (lava stone 80%); and 24,135 MPa (lava stone 100%). Modulus of elasticity was also decreasedlevels comparable to the addition of the lava stone. Average modulus of elasticity value is 22818,000 MPa (lava stone 0%), 18832,333 MPa(lava stone 20%), 16462,333 MPa (lava stone 40%), 15870,667 MPa (lava stone 60%), 15098,000 MPa (lava stone 80%), and13933,333 MPa (lava stone 100%). Concrete qualified targeted quality is lava stone concrete with the maximum level to 80% with averagecompressive strength is 25,266 MPa.
KAJIAN KUAT DESAK DAN MODULUS ELASTISITAS BETON BUBUK REAKTIF MUTU TINGGI DENGAN VARIASI SILICA FUME Wibowo Wibowo; Halwan Alfisa Saifullah; Ikhsan Nur Hidayat
Matriks Teknik Sipil Vol 9, No 2 (2021): Juni
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v9i2.53451

Abstract

Reactive powder concrete adalah beton yang menghilangkan campuran agregat kasar. Kuat Desak dan Modulus Elastisitas beton merupakan parameter utama untuk menentukan mutu beton. Kuat desak merupakan kemampuan beton dalam menahan beban yang dipikulnya. Tolak ukur yang umum dari sifat elastisitas suatu bahan adalah modulus elastisitas yang merupakan perbandingan dari tekanan yang diberikan dengan perubahan bentuk persatuan panjang, sebagai akibat dari tekanan yang diberikan. Penelitian ini menggunakan metode eksperimen dan metode teoritis dengan total benda uji 18 buah. Benda uji yang digunakan adalah beton silinder dengan ukuran diameter 15 cm dan tinggi 30 cm. dengan variasi penggunaan silica fume adalah 0%; 5%; 10%; 15%; 20%; dan 25%. Uji desak dan modulus elastisitas dilakukan pada umur 28 hari, pengujian kuat desak dan modulus elastisitas ini menggunakan mesin CTM (compression testing machine) dengan tambahan dial untuk mengukur penurunan benda uji. Hasil pengujian dengan varias silica fume 0%; 5%; 10%; 15%; 20%; dan 25%, berturut-turut sebesar 65,68 MPa; 67,56 MPa; 68,32 MPa; 70,21 MPa; 69,45 MPa; dan 68,70 Mpa. Pada pengujian modulus elastisitas dengan varias silica fume 0%; 5%; 10%; 15%; 20%; dan 25%, berturut-turut sebesar 34854,38 MPa; 36001,88 MPa, 36655,59 MPa; 36827,03 MPa; 34446,86 MPa; dan 35079,62 MPa terhadap berat semen normal dapat meningkatkan kuat tekan beton dari 65,68 MPa menjadi 70,21 MPa. Kata Kunci : Reactive powder concrete (RPC); Silica Fume; Kuat desak; Modulus elastisitas
Pengaruh Media Pendingin pada Perlakuan Panas T6 terhadap Kekuatan Tarik dan Struktur Mikro Komposit Al6061-Pasir pantai Hafidh Rawi Mufti; Hammar Ilham Akbar; Eko Surojo; Wibowo Wibowo; Teguh Triyono; Sukmaji Indro Cahyono; Nurul Muhayat; Triyono Triyono
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1011.197 KB) | DOI: 10.25077/metal.5.2.51-59.2021

Abstract

Al6061-sea sand composite was manufactured using the stir casting method and its mechanical properties were improved by heat treatment. The T6 heat treatment used to improve the mechanical properties of the composite consists of the following processes: solution heat treatment, quenching, and artificial aging. The solution heat treatment process was carried out at a temperature of 540oC for 6 hours. The quenching process was carried out with different quenching agents (water, oil, and 10% brine). The difference in quenching agents resulted in different cooling rates. After quenching, an artificial aging process was carried out at a temperature of 200 oC for 4 hours. The difference in cooling rate affects the hardness and tensile strength of the specimen. The high cooling rate results in an increase in the tensile strength of the specimen. This is due to the increase in cooling speed, the Mg2Si precipitates formed are smaller in size and located in the grains. The highest tensile strength of specimen (206.67 MPa) is obtained by using brine quenching agent.
Kajian Kuat Kejut dan Keuletan Pada Beton Mutu Tinggi Memadat Mandiri Menggunakan Bahan Tambah Metakaolin dengan Variasi Perbandingan Alkali Aktivator Wibowo Wibowo; Endah Safitri; Mohammad Kamal
Matriks Teknik Sipil Vol 10, No 1 (2022): Maret
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v10i1.55561

Abstract

Inovasi campuran beton terus dilakukan seiring dengan kebutuhan akan kualitas konstruksi yang baik. Indonesia dengan kekayaan jenis material bahan konstruksi merupakan salah satu faktor pendukung untuk melakukan studi-studi akan potensi material tersebut sebagai pengganti semen. Penelitian ini dilakukan untuk mengetahui pengaruh variasi perbandingan massa aktivator Na2SiO3:NaOH sebesar 0 (tanpa alkali), 1:2, 2:2, 3:2 dengan metakaolin 17,5% terhadap nilai kuat kejut dan keuletan beton mutu tinggi memadat mandiri (HSSCC). Metode yang digunakan pada penelitian ini adalah metode eksperimental. Digunakan benda uji beton silinder diameter 15 cm dengan tinggi 6 cm untuk pengujian kuat kejut dan beton balok dengan ukuran 40 cm x 10 cm x 10 cm untuk pengujian keuletan. Pengujian kuat kejut dilakukan dengan metode drop weight test oleh beban kejut, kemudian dilakukan pencatatan jumlah pukulan sampai benda uji runtuh dan perhitungan energi serapan setiap variasi beton. Pengujian keuletan dilakukan dengan metode pembebanan bertambah pada satu titik pembebanan menggunakan mesin UTM. Nilai keuletan merupakan luasan yang dihasilkan dari regresi hubungan beban dan lendutan yang dapat diterima benda uji sebelum retak. Pengujian dilakukan pada saat benda uji memiliki umur 28 hari. Hasil penelitian menunjukkan bahwa beton dengan perbandingan massa aktivator Na2SiO3:NaOH sebesar 2:2 mempunyai kuat kejut dan keuletan paling tinggi, berturut-turut dengan nilai 33207,3 Joule dan 1,3026 kNmm. Untuk itu penggunaan aktivator Na2SiO3:NaOH yang disarankan adalah 2/2 atau sebanding.Kata Kunci: HSSCC, metakaolin, Na2SiO3, NaOH, kuat kejut, keuletan.
KAJIAN SERAPAN CO2 PADA BETON MUTU TINGGI MEMADAT MANDIRI DENGAN BAHAN TAMBAH METAKAOLIN MENGGUNAKAN VARIASI AKTIVATOR NaOH DAN Na2SiO3 Wibowo Wibowo; Halwan Alfisa Saifullah; Nabela Nurwikaningtyas
Matriks Teknik Sipil Vol 9, No 2 (2021): Juni
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v9i2.53975

Abstract

Inovasi beton dilakukan guna menciptakan kualitas konstruksi yang baik.. Jumlah pori pada beton mempengaruhi durabilitas beton. Jumlah pori yang semakin banyak pada beton menyebabkan permeabilitas dan serapan meningkat sehingga menyebabkan kuat tekan dan durabilitas menurun. Penelitian ini dilakukan untuk mengetahui pengaruh variasi perbandingan aktivator Na2SiO3/NaOH sebesar 0; 1/2; 2/2; dan 3/2 terhadap nilai serapan CO2 beton mutu tinggi memadat mandiri dengan substitusi metakaolin 17,5%. Nilai serapan CO2 dapat merepresentasikan porositas beton. Metode penelitian yang dilakukan adalah eksperimental. Benda uji yang digunakan berbentuk tabung dengan diameter 75 mm dan tinggi 150 mm. Pengujian ini berpedoman pada SNI 03-6468-2000, EFNARC 2005, dan  SNI 03-2914-1992. Pengujian serapan CO2 dilakukan dengan merendam benda uji berumur 28 hari selama 10+0,5 menit dan 24 jam pada larutan karbonat 4% kemudian membandingkan berat kering oven dengan berat SSD-nya. Hasil penelitian ini menunjukkan bahwa aktivator alkali yang digunakan dapat menghambat laju serapan CO2. Beton dengan perbandingan Na2SiO3/NaOH sebesar 2/2 memiliki nilai serapan CO2 paling rendah dengan penurunan sebesar 41,22%  pada waktu perendaman 10+0,5 menit dan 20% pada waktu perendaman 24 jam terhadap beton normal.
Kajian Kuat Tarik Belah dan Modulus of Rupture pada Beton Mutu Tinggi Memadat Mandiri dengan Bahan Tambah Metakaolin dan Variasi Perbandingan Aktivator Alkali Wibowo WIbowo; Endah Safitri; Dika Saputri
Matriks Teknik Sipil Vol 9, No 3 (2021): September
Publisher : Program Studi Teknik Sipil FT UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mateksi.v9i3.54695

Abstract

Pembangunan infrastruktur di Indonesia kini berkembang dengan cepat, sehingga inovasi dalam pembuatan beton juga semakin beragam agar mutu, kekuatan, dan durabilitas beton juga semakin meningkat. Metakaolin dapat digunakan sebagai salah satu inovasi untuk mengganti penggunaan sebagian semen pada beton HSSCC karena merupakan pozzolan yang efektif dan reaktif. Agar lebih reaktif, pozzolan dapat direaksikan dengan aktivator yang berasal dari material alkali atau yang biasa disebut aktivator alkali. Tujuan utama dari penelitian yang telah dilakukan adalah bagaimana variasi aktivator alkali pada beton HSSCC dengan bahan tambah metakaolin 17,5% dapat memengaruhi parameter SCC, kuat tarik belah, dan modulus of rupture pada beton tersebut. Aktivator alkali menggunakan NaOH dan Na2SiO3 dengan perbandingan Na2SiO3/NaOH adalah 0; 1/2; 2/2; 3/2. Benda uji pada penelitian ini balok beton tanpa tulangan dengan ukuran 400 mm x 100 mm x 100 mm, serta silinder beton dengan ukuran tinggi 300 mm dan diameter 150 mm. Hasil pengujian menunjukkan bahwa penambahan aktivator alkali menurunkan workabilitas pada beton segar, namun dapat memenuhi syarat beton SCC pada perbandingan tertentu menurut EFNARC 2005. Hasil pengujian parameter kuat tarik belah dan modulus of rupture beton umur 28 hari tertinggi dicapai oleh beton dengan variasi aktivator alkali 2/2, yaitu sebesar 3,09 MPa dan 3,57 MPa.
Co-Authors Achmad Basuki Aditya Rio Prabowo Agus Setiya Budi Agus Setiya Budi Agus Setiya Budi Bambang Santosa Dewana Istiyan Primasatya Didik Djoko Susilo Dika Saputri Dinda Imas Nurdhyanti Eko Surojo Endah Safitri Endah Safitri Endah Safitri Fahri Setyo Utomo Fajar Budi Laksono Falih Fakhri Firman Andriyanto Ganesha Wibisono Lubis Hafidh Rawi Mufti Halwan Alfisa Saifullah Halwan Alfisa Saifullah Hammar Ilham Akbar Hananta Diatmaja Haris Nubli Ikhsan Nur Hidayat Kusno Adi Sambowo M. Haris Habibi Maulana Kangko Wicaksono Maulidah Nur Rizka Mohammad Kamal Muchsan Maulana Sanjaya Muhammad Arbie Khairul Insani Muhammad Luthfi Rifai Muhammad Nasirudin Syuja Muhammad Naufal Muslim Muhayat, Nurul Nabela Nurwikaningtyas Nanda Yusuf Pribadi Wicaksana Nurmantian Suryawan Purnawan Gunawan Purnawan Gunawan Purwanto Purwanto Sukmaji Indro cahyono Teguh Muttaqie Teguh Triyono Triyono Triyono Ubaidillah Ubaidillah Winda Gusanti