Mafriyal Mafriyal
Jurusan Teknik Sipil, Politeknik Negeri Padang

Published : 5 Documents
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Perbandingan Pemakaian Microwave Oven and Oven Standard Untuk Menentukan Kadar Air Aggregat dan Beton Segar Satwarnirat, Satwarnirat; Mafriyal, Mafriyal
JURNAL R & B Vol 2, No 1 (2002)
Publisher : JURNAL R & B

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Abstract

Absorbing process of on “aggregat” can be usad es an assential clue in determining the exact values of water resistance and the cerpability of that concrete, if it is applied in natural condition will take a quite long of time. Therefore its necessary utilitize microwave. For this research, the concrete is divided into three mixtures, based on watering fac of cement which shows, 3 , 0,5 * 0,7. The of these mixtures will be compared with standed oven. The research proves that microwave oven can be used to measure water content both smooth and rough aggregat. As well as in the concrete. The data shows that it takes about 8 minutes for dry the smooth aggregat and 10 minutes for rough aggregat and finally it is two times faster to observe the water persentage for concrete
Analisis Risiko Penawaran Underestimate Terhadap Kualitas Proyek Konstruksi Jalan dan Jembatan di Propinsi DKI Jakarta Mafriyal, Mafriyal
POLI REKAYASA Vol 9, No 1 (2013)
Publisher : POLI REKAYASA

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Abstract

The contractor selection process for the implementation of construction projects are generally done by bidding process. Problem arises if the offer is underestimated. In order not to gain loss or to obtain value of a certain benefit, the contractor applied strategy to reduce the cost allocation for implementation in the field. This research aims to identify underestimate offer risks and determine preventive and corrective actions to the quality of road and bridge construction projects in DKI Jakarta Province. This research is a quantitative study with survey method. The research result identified that the most dominant risks are lack of material required, the quality does not comply with its specification, and the number of equipment is inadequate.
Pengaruh Temperatur dan Pendinginan Terhadap Kehalusan Permukaan Cincin Polyethylene Hasil Cetak Mesin Teforma Tipe RN 350 Rusmardi, Rusmardi; Mafriyal, Mafriyal
POLI REKAYASA Vol 9, No 1 (2013)
Publisher : POLI REKAYASA

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The research aims to study influence temperature and cooling time to surface refinement of printed products of polyethylene plastic ring. The method is heat treatment, injection and cooling, heat temperature 170°C — 250°C, injection time 13 — 50 seconds and cooling time 2 — 50 minutes. Experiment I consists of 5 samples and experiment II using 8 samples, and each samples is repeated 4 times. The result of the research is specimen no 1-15 on experiment I and experiment 11 the results of polyethylene ring surface is in good refinement. It means, the heating time and cooling time have a same positive influence with significance 0,05 to the surface refinement of printed product, or an increating in heating temperature and cooling time have a positive significance 0,05 to the surface refinement of printed product using teforma Printing Machine type RN-350. It is advised to continue this research in tern of the influence of surface refinement in plastic printing and using other plastic materials life polyethylene. Polypropylene, polyvinyl, styrene acrylonitric and acrylonitric butadine styrene.
Faktor Penyebab Kegagalan Akibat Keterlambatan Proyek Konstruksi Pada Bangunan Gedung di Kota Padang Riswandi, Riswandi; Natalia, Monika; Mafriyal, Mafriyal
Jurnal Ilmiah Rekayasa Sipil Vol 15 No 1 (2018): Edisi April 2018
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.85 KB) | DOI: 10.30630/jirs.15.1.89

Abstract

Keberhasilan proyek adalah tujuan akhir yang utama dari setiap pelaksanaan proyek konstruksi gedung. Perbedaan keberhasilan proyek disebabkan karena tiap proyek mempunyai faktor-faktor pengaruh yang berbeda-beda. Ada kalanya proyek tidak berjalan lancar sesuai perencanaan awal. Hal ini disebabkan oleh banyak faktor, seperti faktor alam, faktor tenaga kerja, lokasi, material, koordinasi, administrasi dan lain-lain. Faktor-faktor tersebut dapat menjadi permasalahan atau kendala yang menyebabkan tidak lancarnya pelaksanaan proyek konstruksi. Padahal proyek konstruksi harus memenuhi tiga criteria yaitu mutu, biaya, dan waktu (triple constraint) sesuai dengan yang telah ditetapkan.Oleh karena itu, semua pihak yang terlibat dalam proyek konstruksi gedung (owner, konsultan, kontraktor) harus mengetahui faktor-faktor penyebab kendala selama pelaksanaan proyek konstruksi gedung. Dengan diketahuinya faktor-faktor ini, semua pihak yang terlibat dapat menentukan solusi/strategi apa yang harus dilakukan untuk menangani masalah yang timbul di lapangan selama pelaksanaan proyek konstruksi. Dengan diketahui dari awal, dapat diantisipasi sedini mungkin semua kendala/permasalahan yang timbul, dan tidak akan ada pihak yang dirugikan.Penelitian ini bertujuan untuk mengidentifikasi faktor-faktor penyebab kendala kegagalan yang disebabkan oleh keterlambatan pelaksanaan proyek konstruksi di Kota Padang Sumatera Barat.  Metode Penelitian yang digunakan analisis deskriptif menggunakan quisioner dengan data proyek konstruksi yang sedang atau sudah dikerjakan di Sumatera Barat. Adapun respondennya adalah project manager, site manager.Dari quisioner yang dilakukan pengujian data dengan menggunakan SPSS. Pengujian data meliputi uji validasi, uji reliabilitas,uji normalitas uji korelasi,dan uji analisa diskritif. Adapun tujuan dari penelitian ini adalah untuk mengetahui faktor dominan penyebab kendala proyek konstruksi di Kota Padang adapun faktor dominan pada pengujian ini yaitu pada subfaktor jadwal penggunaan material yang terperinci dan tepat waktu (material’s schedule) dengan nilai mean 3,55 atau 87,50 % . Hasil penelitian ini nantinya diharapkan dapat sebagai bahan masukan/pertimbangan dalam mengambil kebijakan  untuk semua pihak yang terlibat dalam pelaksanaan proyek konstruksi agar tercapai keberhasilan proyek.
Analisis Variabel-Variabel Risiko pada Pelaksanaan Proyek Konstruksi Jalan Hidayati, Rahmi; Natalia, Monika; Adibroto, Fauna; Mafriyal, Mafriyal; yurisman, yurisman; Saskia, Rizkina
Jurnal Ilmiah Rekayasa Sipil Vol 14 No 2 (2017): Edisi Oktober 2017
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.549 KB) | DOI: 10.30630/jirs.14.2.106

Abstract

This research aims to identify the risk variables that ever occurred while executing of road construction project. In addition, it is to identify how significant and how big the influence of risk variables to the articulation of project execution processes of a road construction project, based on questionnaire that distributed to 30 questionnaires who are project managers and site managers on contractors of road construction project.  From the research data, there were identified 14 risk variables with 84 risk sub-variables on execution of road construction project. Those 14 risk variables were natural, social, politic, economic, law, occupational safety and health, managerial, technical, cultural, logistic, condition around construction site, design and technology, labor, and contractual variables. From the data analysis by using SPSS version 16, obtained there were 14 risk sub-variables which became the most influential sub-variables (indicators) to the road construction project. All sub-variables on the questionnaire are valid and reliable. The results of this research is expected to be considered for all parties involved in the construction project to pay more attention to risk variables during the execution of road construction project.