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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Teknik Journal of Applied Materials and Technology Journal of the Civil Engineering Forum SAINSTEK Journal of Infrastructure and Construction Technology
Kamaldi, Alfian
Universitas Riau
Arts Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Penambahan Serat Polypropylene Terhadap Sifat Mekanis Beton Normal Yuri Khairizal; Alex Kurniawandy; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This research studies the mechanical properties of polypropylene concrete consist of compressive strength, modulus of elasticity, splitting tensile strength, flexural strength and deflection. Polypropylene fiber is a kind of plastic fiber that specially produced with high technology. Application of this polypropylene fiber aim to improve the mechanical propertiesof normal concrete. The specimens are cylinder and beam shapes. The variety that use is additional of polypropylene fiber at 0,0 kg/m3, 0,2 kg/m3, 0,4 kg/m3, 0,6 kg/m3, 0,8 kg/m3 and 1,0 kg/m3. The result of research shows that highest compressive strength and modulus of elasticity of concrete occurred at 0,4 kg/m3 polypropylene various. Highest splitting tensile strength and flexural strength of concrete occurs at 1,0 kg/m3 polypropylene fiber various. In generally, deflection test shows improvement within addition of polypropylene fiber. According to the result of research, additional polypropylene fiber into concrete mixture can improve the mechanical properties of concrete, especially compressive strength, modulus of elasticity, splitting tensile strength and deflection of concrete.Keyword : polypropylene fiber, mechanical properties, compressive strength, splitting tensile strength, flexural strength
Evaluasi Kegagalan Penawaran Kontraktor Pada Pelelangan Umum Pascakualifikasi Proyek Jalan Dan Gedung Tahun 2015 – 2017 Di Provinsi Riau Riska Yulia; Rian Tri komara Iriana; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The success of the contractor in getting a job (project) can be seen in the process called tender. In tender phase, as a Presidential Regulation of The Republic of Indonesia Number 4 in 2015 explanation about government procurement. Generally, the stage of bid evaluation is divided into 4 stages, that are administrative evaluation stage, technical evaluation, price evaluation, and verification stages, all use an electronic procurement system called Layanan Pengadaan Secara Elektronik (LPSE). Based on the regulation above, this research purposes to find out the failure variables and the percentage of its variables in each process the construction services auction in government project, especially in Riau Province. The primary data that was obtained from the quetionnaire to contractor companies and interview with LPSE staff, and secondary data was obtained from the LPSE website of Riau Province, speficifically the auction of road and building project from 2015 to 2017. A certain spread sheet application program was used to calculate and analyze data, and presented in some bar charts. As the result, the dominant failure in the bid evaluation phase during 2015 to 2017 are, (1) Administrative evaluation: it does not fulfill the requirements for validity period of offering letter not less than the time as stated in the Election Document (27%), (2) Technical evaluation: the schedule for the execution of the work offered is not as stated in the Election Document (43%), (3) Price evaluation: it does not fulfill the lowest price requirements, so it cannot be evaluated, because it has already received 3 aritmethic lowest offer that passed the evaluation (69%), (4) evaluation of verification: it does not fulfill requirements attaching Quarry permit in accordance to requirements in bid documents (44%) and addendum and proof of completeness of minimum number of personnel (67%). Keywords: evaluation, failure, offering, auction, tender.
Agregat Buatan Geopolimer Dengan Bahan Dasar Abu Terbang (Fly Ash) Dan Abu Sawit (Palm Oil Fuel Ash) M Hari Bhakti; Monita Olivia; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Artificial geopolymer aggregates is one of many methods on making aggregates in case for substitution of natural aggregates. The main ingredients of thisgeopolymer is a material that contains silica and aluminium in a great numbers. In the province of Riau fly ash (FA) and palm oil fuel ash (POFA) are waste materials that until this time did not get utilized optimally whereas this materials are verypotentially for geopolymerization. NaOH and Na2SiO3 are used as alkaline activators, NaOH molarity (0, 8, 10 and 12M ) used as variation on sample composition. The highest compressive strength based on variation is using as the next sample artificial aggregates composition with 1-2cm size of diameters. Researchshowed that 12M variation results the highest compressive strength, that is 2,8 MPa for FA and 9,9 MPa for POFA. Based on that composition artificial geopolymer aggregates were made and then tested by its specific gravity, gradations andabrations.Keywords: artificial, aggregates, geopolymer, fly ash, palm oil fuel ash
Durabilitas Beton Bubuk Kulit Kerang Di Lingkungan Air Laut Elen Tarisa; Monita Olivia; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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In this study,blood clam used as cement replacement material. The specimens were cured in distilled water until 28 days. Then specimens were immersed in sodium chloride solution until 91 days. The parameters studied include compressive strength, workability, and density. These properties were compared with those of a control concrete that was made of Ordinary Portland Cement (OPC). The main parameter of this study was the proportion of waste blood clam (4% by cement weight).Keywords: blood clam, cement replacement, sodium chloride solution, compressive strength, workability, density
Analisis Perilaku Balok Beton Bertulang Tanpa Tulangan Geser Melalui Pemodelan Elemen Hingga Muhammad Rizki; Ridwan Ridwan; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The Beam is a structural element that has the function of bearing the load perpendicular to the longitudinal axis. The collapse of reinforced concrete beams without shear reinforcement can be caused by the collapse of one of the shear force transfer components. Beams without shear reinforcement will experience changes in behavior both in terms of strength and collapse patterns. Crack patterns that occur in the test specimen due to loading can change due to changes in the shear strength of the concrete. The purpose of this study was to analyze the shear behavior of reinforced concrete beams without shear reinforcement to obtain crack patterns maximum load, and maximum deflection values through finite element model. The crack pattern of the specimens through the finite element program started by the initial cracks that initially occur in the tensile region in the form of flexural cracks, then cracks turned into diagonal cracks towards the compressive part of the beam near the load bearing which cause a failure in the form of shear failure. The results of finite element model showed the maximum load obtained by reinforced concrete beams without shear reinforcement is 31.493 kN with a deflection of 8.054 mm.Keywords: beam without shear reinforcement, FEM, shear behavior, crack pattern
Analisis Produktifitas Tenaga Kerja Pada Pekerjaan Pylon Proyek Pembangunan Jembatan Siak IV Pekanbaru Azizah Fil Ahlia; Rian Tri Komara Iriana; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Labors productivity greatly impacts the success of construction project. Therefore, it is imperative to perform analysis on the determination of labors productivity. The purpose of this research is to find out the coefficient value of labors on the Siak IV Bridge project and to assess coefficient value of labors that has been obtained between coefficient value on the minister of public works regulation No. 28/PRT/M/2016 and project contract document. So, to find the coefficient value, the researcher must know the labor’s productivity whis is important factor for the success of a project, so it needs to ways examine to measure labors productivity in a project. In this study, the measurement of labors productivity was carried out in the upstream and downstream pylon jobs in segment 9 with sub workings reinforcement, formwork, casting by doing observation in the field. Field observation has purpose to find out timing which is needed to finish sub workings. Coefficient which is obtained from result analysis on front pylon for sub working reinforcemant is 0.414 OH for labors, 0.160 OH for workers, 0.032 OH for foreman. On formwork sub working it shows 0.324 OH for labors, 0.88OH for workers, 0.029 OH for foreman. Then the result shows on back pylon analysis sub working reinforcement, 0.432 OH for labors, 0.170 OH for workers, 0.033 OH for foreman. On formwork shows 0.148 OH for labors, 0.049 OH for workers and 0.025 OH for foreman. Coefficient for casting sub working shows 0.304 OH for labors, 0.083 OH for workers and 0.028 OH for foreman.Keywords: Coefficient, Labors, Productivity, Siak IV Bridge Construction.
Pemodelan Perpindahan Panas (Heat Transfer) Beton Silinder Pada Saat Terbakar Dyna Aulia R; Alfian Kamaldi; Reni Suryanita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Fire hazard can bring serious problems to reinforced concrete buildings. At combustion temperatures, heat from the fire propagates from the surface into the core of the concrete. This study aims to model the heat transfer on concrete and the results were compared to numerical method proposed by Wickstrom (1987). The specimen used in this study was a concrete cylinder with the diameter of 150 mm and the height of 300 mm. The specimen was exposed to a combustion temperature of 800oC with the combustion duration of 3 hours. The model carried out in the LUSAS v.16 program. Measurements were made at the distance of 19, 38, 56, and 75 mm from the perimeter of cylinder. The results of the study showed the difference in temperature increase using 2D, 3D, and Wickstrom model. For comparison between Wickstrom and 2D at a depth of 19 mm is 15.96%, for 38 mm is 43.57%, for 56 mm is 66.95%, and for a distance is 75 mm of 89.93%. Moreover, the results gained from 2D finite element analysis was 2,05% higher than 3D finite element analysis. The greater the depth of the review, the results between model and Wickstrom method will be much different. The average value of these results can be used as a reference value of the temperature increase at the point of review at a certain distance from perimeter of cylindrical concrete model under high temperatures.Key words: heat transfer, thermal conductivity, specific heat , LUSAS v.16, Wickstrommethod.
Analisis Sifat Fisik Dan Mekanik Kayu Kelapa Sawit Hasil Kompregnasi Melamine Formaldehyde Bambang Arif Hidayat; Alfian Kamaldi; Fakhri Fakhri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
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Abstract

During the past time the utilization of palm oil tree only limited to producing fruit to produce oil with all their derivatives, as well as the utilization of  husk and midrib. Stem, as the biggest mass palm oil tree has not been used commercially due to its lack of quality. One effort in improving quality of palm oil wood is compregnation. Compregnation interpreted as an effort of putting the chemicals into wood structure using prresure. Chemicals that can penetrate into wood structure in this case is melamine formaldehyde resin. The result of research showed that compregnation palm oil wood by melamine formaldehyde increased the specific of gravity of wood from 0,32  before compregnation to 0,48, 0,58 and 0,65 for 50%, 75% and 100% concentrate. Moisture content decreased from 12,05% before compregnation to 10,67 at 100% concentrate. MOR increased  from 64,58 kg/cm2 before compregnation to 131,54 kg/cm2, 188,94 kg/cm2 and 361,14 kg/cm2 each for 50%, 75% and 100% concentrate. Keyword:  Elaeis guineensis Jacq, Compregnation, Melamine Formaldehyde,  MOR
Pemodelan Elemen Hingga Balok Beton Bertulang Yang Diperkuat Dengan Metode Deep Embedment Wan Muhammad Nurhud; Ridwan Ridwan; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Abstract

The shear capacity of existing reinforced concrete structures is often unable to meet existing requirements. This decrease in strength can be caused by increased load, strong shear that is inadequate in initial design and material damage due to natural factors. Many methods that have been done are by means of external bonded (EB) method and near-surface mounted (NSM) method. However, shear resistance using the EB and NSM methods is prone to structural failures due to the magnification of this method only to contain an epoxy attachment and its blanket. To overcome this problem, the resistance method using deep embedment (DE) method have been proposed to reinforcement the shear capacity of existing reinforced concentrate structures. The resistance using DE method is the strenghtned shear capacity in kernel of reinforced concentrate beams. The purpose of this study was to analyze the shear behavior of reinforced concrete beams strenghtned by the DE method through finite element modeling. In this research, the existing reinforced concentrate structures put up the reinforcement by implant three kinds of steel carcass with 200 mm each gaps spread out shear beam. The maximum load result obtained from finite element analysis on reinforced concrete beams reinforced by the DE method was 31.81 kN. While the maximum deflection results obtained in finite element analysis was 8.32 mm. The failure model that occurs in the beam which is strengthened from the results of finite element analysis is the bending collapse. Keywords: shear reinforcement, deep embedement method, finite element model, shear capacity, reinforced concrete beams
Behaviours Of Fiber Concrete Mechanic Using Polypropylene Nur Alfikri; Alex Kurniawandy; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
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Abstract

This research studies the mechanical properties of polypropylene concrete such as compressive strength, modulus of elasticity, splitting tensile strength, flexural strength and ultrasonic pulse velocity (UPV). Application of polypropylene fiber aims to improve the mechanical properties of normal concrete. The specimens were cylinder and beam shapes. The variations of polypropylene fiber used were 0,0 kg/m3, 1,2 kg/m3, 1,4 kg/m3, 1,6 kg/m3, 1,8 kg/m3 and 2,0 kg/m3. The result of research shows the highest compressive strength, modulus of elasticity, flexural strength and UPV occurred at 1,4 kg/m3 addition of polypropylene whereas. The highest splitting tensile strength was occured at 2,0 kg/m3 polypropylene fiber addition. According to the result, additional polypropylene fiber can improve the mechanical properties of concrete, especially compressive strength, modulus ofelasticity, splitting tensile strength and UPV of concrete.Keyword : polypropylene fiber, mechanical properties, compressive strength, splitting tensile strength, UPV
Co-Authors Alex Kurniawandy Alfadh, Mhd Raja Alfadh, Mhd Raja Ali Imron Rusadi Arnef Frenki Azizah Fil Ahlia Bambang Arif Hidayat Bambang Sugiarto Dyna Aulia R Elen Tarisa Enno Yuniarto Fakhri Fakhri Fakhri, Fakhri Gunawan Wibisono Ismeddyanto, Ismeddiyanto Jemaa, Yaser Joni, Mustika Kurniawan, Fahmuji M Hari Bhakti Mardiah, Ramona Marlaily Idris MG, Intan Monica Monita Olivia Muhammad Rizki Novan, Andre Nur Alfikri Pangestu, Hizbulah Pratama, Rudy Satriya Putri, Dhea Triviananda Rani Putri Handayani Reni Suryanita Reny Akmalia Rian Trikomara Iriana Ridwan Ridwan Ridwan Ridwan Riska Yulia Salsabila, Elsa Attila Wahyu Rahmadhan, Wahyu Wan Muhammad Nurhud Wanda Putri, T. Sy. Zahiyyah Aini Wulandari, Chrisfella Yogi Saputra, Yogi Yuri Khairizal