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All Journal Media Teknik Sipil Jurnal Ilmiah Teknik Sipil MEDIA KOMUNIKASI TEKNIK SIPIL Sinergi Rekayasa Sipil Semesta Teknika Teknisia Jurnal Teknik Sipil Bangunan Jurnal Rekayasa Sipil Journal of the Civil Engineering Forum Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jurnal Aplikasi Teknik Sipil Jurnal Riset Rekayasa Sipil Publikasi Riset Orientasi Teknik Sipil (Proteksi) Journal of Civil Engineering and Planning (JCEP) Bulletin of Civil Engineering Andalasian International Journal of Applied Science, Engineering, and Technology Universitas Muhammadiyah Yogyakarta Undergraduate Conference Proceeding Prosiding Seminar Nasional Program Pengabdian Masyarakat Journal of the Civil Engineering Forum Jurnal Penelitian Transportasi Darat
Hakas Prayuda
Universitas Muhammadiyah Yogyakarta
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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Strategi Penawaran dalam Industri Konstruksi (Studi Kasus di Layanan Pengadaan Secara Elektronik, Kota Bandung) Hakas Prayuda, Mandiyo Priyo ,
Jurnal Semesta Teknika Vol 16, No 1 (2013): MEI 2013
Publisher : Jurnal Semesta Teknika

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Abstract

The aims of this research are to calculate the value of mark-up using bidding strategy approach and to determine the best bidding strategy to win a tender with the optimum mark-up value and the optimum profit. The data being used in this research are auction data that have been completed in 2010-2012 at LPSE Bandung using statistical approach namely discrete multi distribution, normal multi distribution, and single normal distribution. Bidding strategy methods being used are Friedman Method, Gates Method, and Ackoff & Sasieni Method. The Friedman Method can generate an optimum mark-up of 10% with expected profit of -0.0014, an optimum mark-up of -9% with expected profit of -0.0003, and an optimum mark-up of -1%  with expected profit -0.0004 for discrete multi-distribution, multi-normal distribution, and  single normal distribution, respectively. The Gates Methods can produce an optimum mark up of 6% with expected profit of 1,5000, an optimum mark up of 5% with expected profit 0.0097, and an optimum mark up of 6% with expected profit 1.2888 for discrete multi distribution, multi-normal distribution, and single normal distribution, respectively. While the Ackoff & Sasieni Methods can generates an optimum mark-up of -2%  with expected profit -0.0003, an optimum mark-up of  1% with expected profit for 0,0013 for discrete multi distribution, and for both multi and single normal distributions, respectively.
Pengaruh Variasi Bahan Tambah Abu Sekam Padi dan Zat Adiktif Bestmittel 0,5% Terhadap Kuat Tekan Beton Mutu Tinggi Nugraha, Yoga; Prayuda, Hakas; Saleh, Fadillawaty
Semesta Teknika Vol 20, No 2 (2017): NOVEMBER 2017
Publisher : Semesta Teknika

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Abstract

Concrete is the mixture of portland cement or hidrolyc cement, fine aggregate, coarse aggregate and water with or without additional mixture to form solid mass. The use of cement makes the concrete price more expensive, so an innovation is needed which to be use natural additive, such as rice husk ash. This research was carried by decreasing the use of cement that was replaced by rice husk ash with the variation 5%, 10%, and 15%, and 0.5% additive material (bestmittel) of the cement. Cylinder samples with the diameter of 15 cm and heigth of 30 cm were tested at the age of 28 days. The result of this research shows that the compresssive strength of the concrete was affected by the additional of rice husk ash (RHA) and additive material (bestmittel), which decrease the compressive strength every additional rice husk ash. The use of rice husk ash and bestmittel on the concrete for 3 variation which were 5 % ; 10% ; and 15% with the additive (bestmittel) 0.5%  obtained compressive strength were 32,23MPa; 31,84MPa and 27,71MPa.
Pengaruh Penambahan Pecahan Kaca Sebagai Bahan Pengganti Agregat Halus dan Penambahan Fiber Optik Terhadap Kuat Tekan Beton Serat Ikhsan, Muhammad Nur; Prayuda, Hakas; Saleh, Fadillawaty
Semesta Teknika Vol 19, No 2 (2016): NOVEMBER 2016
Publisher : Semesta Teknika

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Abstract

Fibre concrete is an innovation of normal concrete to special concrete to be stronger withstands the tensile force. Fibre concrete consists of cement, water, fine aggregate, coarse aggregate and additional fibre materials. The addition of fibre is expected to reduce the segragation and prevent cracks of the concrete. In this research used additional glass fracture with variation of 15%, 20%, 25% to the weight of the fine aggregate as well as additional of optic fibre of 0,15% of the concrete’s weight. Their compressive strength was examined at the age of 28 days. The result is gained by adding 15% of glass fracture 24,94 MPa with modulus of elasticity 23471,8 MPa, addition of 20% gained the result of compressive strength by 25,48 MPa with modulus of elasticity 23724,5 MPa, meanwhile by adding glass fracture 25% gained the result of compressive strength 25,77 MPa with modulus of elasticity 23859,2 Mpa.
Kuat Tekan Beton Serat Menggunakan Variasi Fibre Optic dan Pecahan Kaca Pratiwi, Sustika; Prayuda, Hakas; Prayuda, Fadillawaty
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
Publisher : Semesta Teknika

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Abstract

Fibre concrete is one of special concretes which developed from normal concrete by adding fibre into concrete mortar. It aims at preventing crack of loading, heat hydrating as well as depreciation and to increase the stress force, bent force, and tensile force. In this research used the fibre optic which is a synthetic fibre obtained from the inside of optic cable. Glass is a material which is easy to find and has an economic value, beside that glass also has excellent resistance of abrasion, weather or chemical attack. This research uses three variations of fibre grade that are 0,1%; 0,15%; 0,2% with the length 10 cm obtained from concrete weight, while glass fracture that used is 20% of sand weight. Average Compressive strength   of fibre addition consecutively 22,43 MPa; 24,31 MPa and 29,63 MPa. Compressive strength increased with the increasing number of fibre.
Gaya Lateral In-Plane Struktur Portal Dinding Pasangan Bata ½ Batu Melalui Analisis Numerik Prayuda, Hakas
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
Publisher : Semesta Teknika

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Abstract

Building construction in Indonesia is categorized as two big classes; there are engineered building and non-engineered building. Non-engineered building is very susceptible to the lateral load such as an earthquake, either medium earthquake or massive earthquake that causing sudden collapse so that the research of mitigation building strength needs to be done which is rely on the strength of brick masonry (non-engineered building) that can be predicted through measuring micro vibration at the bottom and the top of the brick masonry wall surface. The aims of this research is to find out the effect of ½ stone brick masonry in its contribution to the rigidity of simple portal structure by using loading in-plane lateral system. Loading analysis result at the plastic limit is 95, 524 kN or only 86,89% of the maximum load, meanwhile lateral deviation at the plastic limit is 7,506 cm or 27,51% of maximum lateral deviation. Besides, The rigidity of ½ stone brick masonry wall is 12,72 kN/cm.
Analisis Kuat Tekan Beton Mutu Tinggi Dengan Bahan Tambah Superplastisizer Dan Limbah Las Karbit Prayuda, Hakas; Pujianto, As’at
Rekayasa Sipil Vol 12, No 1 (2018)
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Brawijaya

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Abstract

This research will discuss about the compressive strength of concrete by using superplastisizer as an addictive substance and waste of carbide weld as the admixture material of cement replacement. Through this research is expected to know the right composition to produce a concrete formula with high quality by utilizing the existing local waste dan superplastisizer (Viscocrete-10). In this study made a sample of concrete cylinders measuring 15 cm diameter with a height of 30 cm totaling 63 specimens with 7 variations with each variation made as many as 9 specimens. The compressive strength test was performed at age 7, 14 and 28 days. Through this research, the result of flowability, compressive strength and elastic modulus of each test object variation.
KUAT TEKAN BETON AWAL TINGGI DENGAN VARIASI PENAMBAHAN SUPERPLASTICIZER DAN SILICA FUME Prayuda, Hakas; Saleh, Fadillawaty
Media Teknik Sipil Vol 17, No 1 (2019): Februari
Publisher : Department of Civil Engineering, Faculty of Engineering, University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.828 KB) | DOI: 10.22219/jmts.v17i1.5951

Abstract

Concrete is one of the construction materials of combination between cement, fine aggregate, coarse aggregate, and water mixed into one solid mass. The work of concrete making can be added a mineral additive as well as chemical additive (admixture) for the interest in construction work. In some cases construction work is desirable for concrete to produce optimum strength during the early age of the concrete so that the timing of concreting work can be shortened. The strength of concrete at the early age can be increased with added mineral (additive) and chemical (admixture) materials. This research made a mixture of concrete with 7 variations of mixture with total specimen 54 sample of cylindrical size with diameter 15 cm and height 30 cm. Tests conducted in the form of testing workability and compressive strength of concrete at the age of 3 days, 7 days and 28 days. Through this study obtained the right composition to make concrete with a high early age of compressive strength.
Analisis Tegangan Regangan dan Defleksi pada Sambungan Balok-Kolom Beton Bertulang Menggunakan Beban Statik Prayuda, Hakas; Cahyati, Martyana Dwi; Soebandono, Bagus
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 24, Nomor 2, DESEMBER 2018
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1953.548 KB) | DOI: 10.14710/mkts.v24i2.18346

Abstract

Reinforced concrete is commonly used in any infrastructures. In building, it can be applied for beam and column separately, but the joints between those elements in this type of structure might be vulnerable due to the strength compared to the element itselft. In this study, some parameters namely ductility, stiffness, and energy dissipation of beam-column connection in precast concrete will be examined using finite element method. Six samples in this experiment are made considering some variations such as connection type in interior and exterios condition, round-shaped and rectanguler-shaped of column, and T-shaped and rectanguler-shaped of beam. Static loads were given in the middle of the beam and column so that the crack pattern can be obtained. From this experiment, it will be known the best and suitable joints by observing those three parmeters.
KUAT TEKAN BETON DAN NILAI PENYERAPAN DENGAN VARIASI PERAWATAN PERENDAMAN AIR LAUT DAN AIR SUNGAI Pujianto, As'at; Prayuda, Hakas; Zega, Berkat Cipta; Afriandini, Besty
Semesta Teknika Vol 22, No 2 (2019): NOVEMBER 2019
Publisher : Semesta Teknika

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Abstract

Penelitian ini membahas pengaruh dari perawatan beton menggunakan air laut dan air sungai terhadap karakteristik beton. Tujuan dari penelitian ini untuk menjelaskan pengaruh dari jenis air pada perawatan beton, khususnya pada beton yang digunakan yang berhubungan langsung dengan air. Pada penelitian ini menggunakan tiga jenis produk semen yaitu Holcim, Tiga Roda dan Gresik dengan total 12 variasi dan 108 benda uji berbentuk silinder berdiameter 15 cm dan tinggi 30 cm. Seluruh variasi menggunakan standar mix design yang sama dengan 6 variasi menggunakan perbedaan jumlah superplasticizer dan 6 variasi menggunakan bahan tambah fly ash. Pengujian yang dilakukan berupa pemeriksaan workabilitas, kuat tekan dan nilai penyerapan. Hasil pada pengujian ini menunjukkan bahwa nilai workabilitas pada beton menggunakan superplasticizer lebih baik dibandingkan beton menggunakan bahan tambah fly ash. Hasil kuat tekan menunjukkan bahwa seluruh benda uji dengan perawatan air laut lebih tinggi dibandingkan dengan beton menggunakan perawatan air sungai. Sedangkan nilai penyerapan menunjukkan bahwa pada umur 28 hari dengan menggunakan air laut menghasilkan nilai yang lebih tinggi dibandingkan perawatan menggunakan air sungai. This study will discuss the effect of concrete treatment using sea water and river water on the characteristics of concrete. The purpose of this study was to determine the effect of water types in concrete treatment, especially for concrete used directly in contact with water. In this study three types of cement brands, Holcim, Tiga Roda and Gresik were used with a total variation of this study as many as 12 with the number of test specimens of 108 cylindrical concrete measuring 15cm in diameter and 30 cm in height. All variations use the same mix design and then modified with 6 variations using super-plasticizer added material while the remaining 6 variations use material added admixture in the form of fly ash which then carried out workability testing, compressive strength and percentage of absorption. The results of this study indicate that the level of concrete workability using superplasticizer added material is much better than using materials added by fly ash. The results of the compressive strength obtained showed that almost all specimens with soaking seawater had a higher compressive strength than concrete with treatment with river water. Absorption results show that at 28 days the seawater absorption rate is greater than river water.  
FRESH AND MECHANICAL CHARACTERISTICS OF SELF-COMPACTING POLYPROPYLENE FIBER CONCRETE INCORPORATED WITH KAOLIN Saleh, Fadillawaty; Cahyati, Martyana Dwi; Prayuda, Hakas; Zega, Berkat Cipta; Monika, Fanny
SINERGI Vol 24, No 3 (2020)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2020.3.007

Abstract

Self Compacting Concrete (SCC) is concrete with high fluidity so that it can flow and fill the spaces in the mold without the compaction process. This study discusses the effect of the adding of kaolin and polypropylene fibers in order to increase the flowability, compressive strength, flexural strength, and tensile strength in self-compacting concrete. The additional material of kaolin was 5%, 10%, and 15% of the cement weight. The polypropylene fibers were 1%, 1.5%, and 2%. The flowability test, which was used, was Table flow, V-Funnel, and L-Box. Compressive strength testing was conducted when the concrete was 7, 14, and 28 days old. The flexural test was performed with a measurement of 150 x 150 x 600 mm as many as 18 specimens tested at the age of 28 days. The results showed that the addition of kaolin and polypropylene fibers met the flowability specifications of self-compacting concrete. The addition of polypropylene can increase the flexural strength and tensile strength of the concrete beam, but cannot increase the compressive strength of self-compacting concrete.
Co-Authors Acep Widiyanto Afriandini, Besty Aji, Kartika Restu Al Fajir M Sarita Andi Herius Anita Rahmawati Aristyasari, Yunita Furi Arma Rizal Riyandar As'at Pujianto As’at Pujianto, As’at As’at Pujianto Bagus Soebandono Bella Lutfiani Al Zakina Berkat Cipta Zega Cahyati, Martyana Dwi Dodi Agusto Wijaya Eri Putra Siswantoro Erlinda, Risky Dwi Fadhila Firdausa Fadhila Firdausa Fadillawaty Prayuda Fadillawaty Saleh Fadillawaty Saleh Fadillawaty Saleh Fadillawaty Saleh Fadillawaty Saleh Fadillawaty Saleh, Fadillawaty Fauzan, Okta Marzantio Hanif Nursyahid Hasibuan, Samsul A Rahman Sidik Hendy Wijaya Ibrahim Ibrahim Ikhsan, Muhammad Nur Indra Bagus Kurniawan Istiawan, Istiawan Istiawan, Istiawan Junaidi Abdurazak Kholil Muqorrobin Lilis Tiyani M Fahrul Hidayat Martyana Dwi Cahyati Martyana Dwi Cahyati Moh. Ervianto Moh. Ervianto, Moh. Monika, Fanny Muhammad Imaduddin Muhammad Nur Ikhsan Nugraha, Yoga Ogata Wilasamba Paudel, Satish Pratiwi, Sustika Prayuda, Fadillawaty Pujianto, As'at Pujianto, As'at Purwanto Purwanto Putra, Firhan Mahreza Yunanto Ramadhan Ramadhan restu faizah Saleh, Fadillawaty Salsabila, Bella Saugani, Muh Sofyan Sinta Rizky Amalia Siti Solihah Soebandono, Bagus Sri Atmaja P. Rosyidi Sri Rezki Artini Sustika Pratiwi Talitha Zhafira Taufiq I. Maulana Taufiq Ilham Maulana Taufiq Ilham Maulana Taufiq Ilham Maulana Tiyani, Lilis Tri Ananda Putri Yanuar Ade Putra Yoga Nugraha