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

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Kuat Geser Kayu Laminasi Acacia Crassicarpa Menggunakan Perekat Epoxy Rani Putri Handayani; Fakhri Fakhri; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 9 (2022): Edisi 1 Januari s/d Juni 2022
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Indonesia is a tropical country that has various types of wood. However, the supply of wood time to time is decreasing, while in construction the demand for wood is increasing. This increase has resulted in massive exploitation of the forest, so that the availability of large diameter timber from natural forests is increasingly limited. The use of wood that has a shorter cutting age (10-15 years) and has a small diameter is not efficient as a structural or construction component. The technology used is a structural form that does not come from whole wood but rather a laminated component that is made through a bonding process. This study aims to determine the shear strength of solid testing, solid coating testing, lamination testing, and coating lamination testing. The wood used in this study is acacia crassicarpa wood and the adhesive used is epoxy adhesive. The adhesive weight used was 50 MDGL (Multilayer Double Glue Line). From the test for testing the solid shear strength is 4,01 MPa, the shear strength of the laminate is 2,10 MPa, the shear strength of the solid coating is 3,37 MPa, the shear strength of the coating laminate is 2,83 MPa.Key words: Laminate beam, acacia crassicarpa wood, shear strength, epoxy adhesi.
Pengaruh Modulus Aktivator (Na2SiO3/NaOH) Terhadap Kuat Tekan Mortar Geopolimer Abu Terbang Dengan Perawatan Suhu Ruang Ali Imron Rusadi; Alfian Kamaldi; Monita Olivia
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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Abstract

Geopolymer is a material made without cement mixture by utilizing waste material such as fly ash, palm ash and husk ash and other materials that are rich in silica and alumina, and activated using solution activators such as NaOH and Na2SiO3. This study examines the characteristics of fly ash and the effect of activator modulus (Ms) on the compressive strength of mortar with the treatment of room temperature. Fly ash used was sourced from PLTU Ombilin, West Sumatra. The variations of activator modulus used were Ms 1, 1.5, 2, 2.5, and 3. The mold used was cube with the size 5x5 cm. The speciments were casted and treated in the laboratory under room temperature condition. The compressive tests were performed at 7, 14, and 28 days of mortar age. The results showed that the fly ash used was included in class F in accordance with ASTM C 618. The compressive strength test showed that there was an increase in compressive strength as the test age increased in all variations of the activator modulus. The highest value of compressive strength was produced by mortar geopolymer with modulus activator 2 which was 11.2 MPa at 28 days, while the lowest compressive strength was produced by mortar with modulus activator 2.5 with difference 19.14% at age 28 day. Key words : mortar, compressive strength geopolimer mortar, room temperature, siactivator iiimodulus
Kekuatan Tekan Sejajar dan Geser Kayu Ulin (Eusideroxylon Zwageri) di Kota Pekanbaru Berdasarkan SNI 7973:2013 Marlaily Idris; alfian kamaldi; Andre Novan
JURNAL TEKNIK Vol. 13 No. 1 (2019): Edisi April 2019
Publisher : JURNAL TEKNIK UNILAK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/teknik.v13i1.2971

Abstract

Kayu adalah salah satu bahan bangunan yang sudah lama dikenal oleh masyarakat kita dan telah dipakai untuk berbagai keperluan, termasuk sebagai pendukung struktur bangunan. Tanaman yang memiliki nama latin Eusideroxylon zwageri Teijsm ini tergolong kedalam suku Lauraceae. kayu Ulin dikenal sebagai kayu kelas kuat I dan kelas awet I sehingga memiliki banyak manfaat dan sangat diminati masyarakat. Tujuan penelitian ini adalah mengkaji sifat sifik dan mekanik dari kayu Ulin tersebut sehingga bisa mendapatkan nilai modulus elastisitas lentur, kuat lentur, kuat tekan, kuat geser dan bisa di klasifikasikan berdasarkan SNI 7973:2013. Dalam penelitian ini terdapat dua variasi yaitu kuat tekan kering udara dan kering oven. Hasil yang didapat yaitu kuat tekan sejajar kayu Ulin lebih besar apabila kayu Ulin dalam keadaan kering oven daripada kering udara, dengan nilai kuat tekan sejajar serat kering oven 26,69 MPa dan kering udara 17,58 MPa. Sedangkan hasil kuat geser lebih besar kering udara daripada kering oven dengan nilai kering udara 3,04 MPa dan kering oven 2,81 MPa
Kajian Kuat Tekan Sejajar Serat dan Kuat Geser Kayu Tembusu (Fragraea Fragrans) di Pekanbaru Terhadap SNI 7973:2013 Intan Monica MG; Alfian Kamaldi; Andre Novan
JURNAL TEKNIK Vol. 13 No. 1 (2019): Edisi April 2019
Publisher : JURNAL TEKNIK UNILAK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/teknik.v13i1.2972

Abstract

Kayu adalah bahan yang umum digunakan baik secara struktural maupun non-struktural. Penggunaan kayu dalam bentuk struktural memerlukan spesifikasi tertentu. Kayu adalah bahan alami yang pertumbuhannya dipengaruhi oleh faktor lingkungan yang menyebabkan perbedaan kualitas kayu. Penelitian ini bertujuan untuk menguji dan memperoleh nilai kuat tekan sejajar serat kayu dan kuat geser kayu serta mengklasifikasikan kayu berdasarkan SNI 7973: 2013. Kayu tembusu (Fragraea fragrans) digunakan sebagai objek dalam penelitian ini. Hasil pengujian diperoleh nilai kuat tekan paralel kayu tembusu variasi A 16,31 MPa sehingga termasuk dalam kategori kayu dengan kode mutu E19. Nilai kuat tekan sejajar serat kayu kayu tembusu variasi B 16,26 MPa sehingga termasuk dalam kategori kayu dengan kode mutu E18. Modulus elastisitas kayu tembusu variasi A yang diperoleh adalah 3.555,95 MPa dan 5.324,24 MPa untuk variasi B. Nilai kuat geser kayu variasi A didapat sebesar 2,54 MPa dan untuk variasi B didapat 3,27 MPa. Penelitian ini bermanfaat untuk menganalisis kuat tekan sejajar serat, kuat geser kayu dan untuk penelitian lanjutan lainnya. Hasilnya diharapkan berkontribusi pada basis data ilmiah umum sifat mekanis kayu di Indonesia dan khususnya dalam desain komponen struktural tekan dan lentur serta untuk penelitian lebih lanjut.
Evaluating Properties of Blended and High Volume Fly Ash Bottom Ash (FABA) Concrete in Peat Water Monita Olivia Olivia; Alfian Kamaldi; Ismeddiyanto; Gunawan Wibisono; Edy Saputra
Journal of the Civil Engineering Forum Vol. 9 No. 1 (January 2023)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.3397

Abstract

FABA is a by-product of coal combustion in power plants comprising fly ash (FA) and bottom ash (BA) in ratios of 80/20. Fly ash has great potential as a mineral ingredient in concrete, while bottom ash compromises its strength and durability. However, both materials are used to improve the strength and durability of structures in sulfate, chloride, and acidic environments. This research evaluated the properties of blended and high-volume FABA concrete, such as the strength, porosity, weight loss, and sorptivity in organic acidic peat water. OPC (Ordinary Portland Cement) was compared to the blended concrete containing 25% FABA and its high-volume containing 50% and 75% FABA with target strengths of 15, 21, and 29 MPa. The compressive strength of blended and high volume FABA increased during the immersion period, while the porosity and sorptivity rates decreased. Furthermore, the strength of the OPC concrete declined at 28 days, with a gradual marginal weight loss of 5% observed in all mixes. This research suggested that blended and high-volume FABA has potential as a construction material in an acidic peatland environment.
Perkuatan Sambungan Perpanjangan Batang Kayu Ulin Dengan Kombinasi Baut Dan Perekat Epoxy Bambang Sugiarto; Fakhri Fakhri; Alfian Kamaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

In this paper, to strengthen the connection between wood joints is conducted by the use of combination of bolt and epoxy adhesives. There where three variations of connection observed in this study e.g; U1, U2, U3. U1 was using a bolt connecting device. U2 was using a bolt connectors which is reinforced with epoxy adhesive on the bolt hole. U3 was using a bolt connectors which is reinforced with 40 MDGL epoxy adhesives in the joint slice plane. The result of this study indicates that the bolt connection yielding mode is theoretically as same as the yielding mode that occurs in the result of laboratory testing, named mode IIIs. The lateral resistance of bolt joints form laboratory tests result is 108% greater compared to the lateral resistance of bolt joints theoretically. The addition of epoxy adhesive to the bolt hole does not provide the real reinforcement of the joint extension of Ulin Woods with bolt connecting tools. The addition of epoxy adhesives with the amount of 40 MDGL in the joint slice plane, provides 16.6% reinforcement on the joint extension of Ulin Woods with bolt joint tools.Keywords: reinforcement joints, bolt joints, epoxy adhesive joints, lateral resistance
Pengujian Modulus Elastisitas Lentur Kayu Tembusu (Fragraea fragrans) di Pekanbaru Monica MG, Intan; Alfian Kamaldi; Andre Novan; Marlaily Idris
SAINSTEK Vol. 12 No. 2 (2024)
Publisher : Sekolah Tinggi Teknologi Pekanbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35583/js.v12i2.292

Abstract

The flexural modulus of elasticity (MOE) is a critical parameter in assessing the mechanical performance of wood, particularly for structural applications. This study investigates the MOE of Tembusu wood (Fragraea fragrans), a tropical hardwood renowned for its durability and versatility in construction and furniture production. Specimens were prepared following SNI 03-3960-1995 standards, ensuring consistency in dimensions and testing protocols. A three-point bending test was employed to evaluate the flexural MOE under controlled laboratory conditions. The results reveal that Tembusu wood exhibits a high flexural modulus, averaging 10.000 MPa, making it comparable to other hardwood species used in structural applications. Additionally, microscopic analysis of wood fibers indicated a correlation between the density and elastic behavior of the material. The study concludes that Tembusu wood possesses excellent bending properties, demonstrating its suitability for beams, joists, and other load-bearing applications. Recommendations for further research include exploring the effects of environmental factors such as humidity and temperature on the long-term performance of Tembusu wood. This research contributes to the growing body of knowledge on sustainable wood materials for engineering applications.
Perkuatan Balok Beton Bertulang Yang Mengalami Kegagalan Geser Menggunakan Metode Deep Embedment Kurniawan, Fahmuji; Kamaldi, Alfian; Yuniarto, Enno; Ridwan
Journal of Infrastructure and Construction Technology Vol. 1 No. 1 (2023): January 2023
Publisher : Dept. of Civil Engineering Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56208/Jictech.1.1.28-37

Abstract

Bridges are infrastructure buildings that are commonly used and very functional in everyday. One of the structural components of the bridge is a reinforced concrete beam as a load bearer that will be forwarded to the foundation. The shear capacity of reinforced concrete beam structures sometimes cannot meet the existing requirements. This can be caused by increased loads, inadequate shear strength in the initial design and material damage due to natural factors. There are several methods that have been carried out to overcome the decrease in shear strength in beam structures, namely reinforcement methods by externally bonded (EB) and near-surface mounted (NSM). In reality, shear reinforcement with EB and NSM methods in implementation only relies on epoxy adhesion and concrete blankets, which still causes structural failure. The deep embedment strengthening method (DE) can be proposed as a shear reinforcement for reinforced concrete beams to overcome the previous problems. Reinforcement with DE method is a shear reinforcement that is reinforced in the core of reinforced concrete beams. This research was conducted by embedding 8 reinforcements vertically with a distance of 200 mm along the shear span. In this study, finite element modeling was carried out using ABAQUS. The results of finite element modeling with the DE method showed that the maximum load was 30.646 kN and the maximum deflection was 13.00 mm. The collapse model that occurs from finite element modeling on test specimens with DE reinforcement experiencing flexural failure.
Disain Kebutuhan Tulangan Glass Fiber Reinforced Polymer (GFRP) Untuk Elemen Struktur Pada Bangunan Beton Bertulang Putri, Dhea Triviananda; Kamaldi, Alfian; Ridwan
Journal of Infrastructure and Construction Technology Vol. 1 No. 1 (2023): January 2023
Publisher : Dept. of Civil Engineering Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56208/jictech.1.1.38-44

Abstract

Fiber Reinforced Polymer is a combination of two main materials Resin Polymer (plastic) as a binder matrix and Fiber (fiber) as reinforcement. This material has three fibers, namely Carbon, Glass, and Aramid. Glass fiber was used in this study, because it has a greater strain compared to other fibers. This study aims to design reinforced concrete structures using steel reinforcement and GFRP as well as to compare the reinforcement requirements of each reinforced concrete. Calculation of reinforcement for steel reinforced concrete refers to SNI 1726-2019, while for GFRP reinforced concrete it is based on ACI 440 1R-2015. This research begins by collecting data in the form of a design structure drawing of a 6-storey hypothetical building, with a total building height of 23 m. The hypothesis building has the number of spans in the X-axis direction is 5 with a distance between columns of 6 m, while the number of spans in the Y direction is 3 with a distance between columns of 5 m. The column dimensions for all floors are 60 cm x 60 cm, while the beam dimensions are 40 cm x 40 cm. The thickness of the floor and roof slabs is 12 cm and the concrete quality is 30 MPa. For the calculation of structural loading, dead load, live load and earthquake load are used and the design of reinforcement for conventional steel reinforced concrete structures and GFRP is carried out. Steel reinforced concrete structures with GFRP reinforced concrete have differences in the amount and diameter of reinforcement required. For beam elements bearing steel reinforcement, 24 pieces of flexural reinforcement are needed with a diameter of 19 mm, while for beam elements, GFRP reinforcement requires 12 pieces of flexural reinforcement with a diameter of 1 inch to 1,128 inches. For the field area, steel reinforcement beam elements need 12 pieces with a diameter of 19 mm, while for GFRP reinforcing beam elements require 8 pieces of flexural reinforcement with a diameter of 0.875 inch to 1.128 inch. In column elements, steel reinforcement and GFRP reinforcement require the same amount of main reinforcement, which is 32 pieces. However, in terms of diameter, steel reinforcement requires 25 mm diameter reinforcement, while GFRP is 1 inch in diameter.
Nilai Slump, Porositas Dan Kuat Tekan Beton OPC Dan OPC RHA Untuk Aplikasi Di Lingkungan Gambut Alfadh, Mhd Raja; Kamaldi, Alfian; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The aggressive environment, especially the peat environment contains many chemicals that can unravel the elements in the concrete, causing damage to the concrete. This study examines the strength and physical properties of OPC (Ordinary Portland Cement) concrete and OPC RHA (Rice Husk Ash) concrete exposed in peat environments. RHA as one of pozzolan with high silica is used as a replacement of cement with the substitution of 5% and 10%. This concrete are tested mechanically and physically such as compressive strength and porosity tests after soaking in peat canals for 28 days, in addition to fresh concrete tests such as workability. The concrete strength of the planned concrete is K-250. The peat water used as a test immersion medium has a pH of 3.5-4.5. The results of fresh concrete testing show that the addition of RHA makes the workability decreases. The lowest workability was obtained from a mix containing 10% RHA. The OPC concrete has the highest compressive strength of 20,28 MPa. Porosity of OPC RHA concrete decreased with increase in curing time. The lowest porosity is shown by OPC RHA 10% concrete. Based on the results of the test, it is concluded that the replacement of cement by RHA, has a positive effect on all physical properties of concrete.Keywords: Peat Environtment, OPC, RHA, Compressive strength, Physical Properties
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 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 Wahyu Rahmadhan, Wahyu Wan Muhammad Nurhud Yogi Saputra, Yogi Yuri Khairizal