Article Per Year (5 Year)
p-Index From 2019 - 2024
1.984
P-Index
This Author published in this journals
All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Teknik Journal of the Civil Engineering Forum
Kamaldi, Alfian
Universitas Riau
Arts Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering

Published : 26 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 26 Documents
Search

 1   2   3 
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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
Analisis Beban Ledakan Dan Pengaruhnya Terhadap Struktur Portal Baja Joni, Mustika; Suryanita, Reni; Kamaldi, Alfian
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Bomb explosions in Indonesia have occured relatively more frequently and become a real threat to society. In the blast phenomena, loss of life and injuries to occupants can result from the structural collapse. Therefore it were necessary to do an analysis of the effect under blast load on the building with the aim of this research was to analyze the condition of the frame on a structure based on analysis of internal forces and structural response due to blast load. The building structure model was a steel frame structure of 5 story with a typical floor to floor height of 4 m. Variations of explosive weights of 500 kg and 1.000 kg of TNT were applied to a building structure model have converted into a static load at distance 25 m of blast source. To define the blast load on the structure, ATBLAST software will be used, and to determine blast load parameters need to be calculated with Pythagoras Theorem based on TM 5-1300-1990. Analysis was performed with Finite Element Method (FEM) software with linier static method will be used, the results of analysis were axial and moment force. The axial force was 621,28 kN, moment force weakness axis direction was -665,93 kN-m and moment force strong axis direction was 0,48 kN-m. Based on this analyze it can be concluded that the internal forces have occured proportional to the explosive weights of the building structure and frame conditions in the structure model was considered still allowable to received blast load of 500 kg TNT, however for the 1.000 kg of TNT explosive weights, structure model was collapse.Keywords: Blast load, inform force, linier static
Pemodelan Perilaku Tegangan Dan Regangan Beton Saat Terbakar Rahmadhan, Wahyu; Kamaldi, Alfian; Suryanita, Reni
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Concrete exposed to high temperatures decrease its strength. Droped down in concrete strength under strength requirement will make the concrete fail to be functioned. The strength of the concrete can be determined from laboratory test, or mathematic model based on the results from experimental test. This study aims to identify the behavior of the stress and strain of the concrete exposed to high temperatures. The model was carried at using Finite Element Software LUSAS and the results compared to mathematic model proposed by Li and Purkiss (2005) and Chang (2006). The speciment used in this study was cylindrical with diameter of 150 mm and height of 300 mm with a 25 MPa of the concrete strength. The model was simulated burning with a constant temperature that varied from 100°C to 800°C. The result showed that strain stress curve shown from the empirical formula has an elastic phase of 0.6f'c, while modeling based LUSAS has an elasticity phase of 0.45 f'c. The difference between the elastic and plastic phases in the LUSAS model was clearly visible according to the temperature of the concrete, while the models using the empirical formula were not affected by temperature. It can concluded that empirical formula model and LUSAS can be used as a reference for the behavior of concrete when exposed to high temperatures.Keywords : modeling, high temperature, stress, strain, LUSAS
Pengaruh Persentase Semen Opc Terhadap Kuat Tekan Mortar Geopolimer Abu Terbang Dengan Perawatan Suhu Ruang Pratama, Rudy Satriya; Kamaldi, Alfian; Olivia, Monita
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Geopolymers are environmentally friendly materials that utilize inorganic industrial waste rich in silica and alumina such as fly ash which is reacted with alkaline solutions. This study examined the effect of the percentage of Ordinary Portland Cement used as a partial substitute for fly ash against the compressive strength of mortar. The variation in the percentage of OPC used was 5%, 10%, 15%, 20% and 25%. The size of the mortar used was 50 mm × 50 mm × 50 mm. Tests on geopolymer mortar were carried out at 7, 14 and 28 days after the samples were cured under room temperature. The results showed the increase in the use of OPC would increase the compressive strength of geopolymer mortar. The use of OPC with 25% of the fly ash had a compressive strength of 11.2 MPa at 28 days after the samples were cured under room temperature. Furthermore, the compressive strength increased to 180% against the compressive strength of geopolymer mortar with the used 5% OPC. Mortar geopolymers with used of OPC 5%, 10%, 15%, and 20% had compressive strength 4 MPa, 8 MPa, 8 MPa, and 11.2 MPa after the samples were cured under room temperature. The conclusion obtained from this study was that the use of OPC of 25% as a substitute of fly ash in the geopolymer mortar was the optimum percentage which resulted in the maximum compressive strength.Keywords: Mortar, geopolymer, fly ash, compressive strength, OPC cement
Perkuatan Sambungan Perpanjangan Batang Kayu Resak Dengan Kombinasi Baut Dan Perekat Epoxy Saputra, Yogi; Fakhri, Fakhri; Kamaldi, Alfian
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Resak is local wood originated from Indonesia, this wood is classified as class II for its strength and class III for its durability according to (PKKI 1961 NI-5). Three type of connections were observed in this study, they were U1, U2, and U3. U1 was the bolt connection, U2 was the combination of bolt with adhesive on the slice plane, while U3 wasthe combination of bolt with adhesive on the bolt hole. This study oins to study the shear strength of wood connection with respective connection models by being tested using a tool Universal Testing Machine (UTM). The test results showed that the shear strength of the thecombination of bolt with adhesive on the slice plane showed a strength increase of about + 31.02%. For the combination of bolt with adhesive on the bolt hole did not increase, even decreased by -13.86%. the connection bolt and adhesive connection in the slice plane show good gluing performance making it suitable for large capacity connection designs and increase connection reinforcement.Keywords: Wood resak, reinforcement joints, extension joints, bolts, epoxy adhesives.
Pemodelan Perilaku Tegangan dan Regangan Beton pada Suhu Tinggi dengan Software LUSAS Suryanita, Reni; Rahmadhan, Wahyu; Kamaldi, Alfian
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 1, JULI 2019
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (767.458 KB) | DOI: 10.14710/mkts.v25i1.20575

Abstract

The concrete structure exposed to high temperatures can affect the strength of the structure. Limitations in the experimental method can be solved by mathematical modeling. This study aims to identify the stress and strain behavior that occurs at high-temperatures. The model is a cylindrical concrete with a diameter of 150 mm and a height of 300 mm. The concrete strength design is 25 MPa. The temperatures of the model are 100 °C, 200 °C, 300 °C, 400 °C, 500 °C, 600 °C, and 700 °C. The model analysis using LUSAS v. 16 Software to observe the properties of the concrete material due to exposure to high temperatures. The results of the study get the higher the temperature received by concrete, the strength of the concrete decreases. Concrete that burned to a temperature of 300 °C still had 82% available power, and at a temperature of 700 °C, the remaining concrete strength was 30%. The strain increases to 423% from normal conditions at a temperature of 700 ° C. Therefore, the results of the study can be used as a reference for structural engineers to know the behavior of the concrete that exposure to high temperatures.
Porositas Beton Blended Abu Terbang (Fly Ash) Sebagai Substitusi Semen Di Air Gambut Mardiah, Ramona; Kamaldi, Alfian; Olivia, Monita
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

One of the environmental conditions that can affect the quality of concrete is peat water. In this study an alternative was carried out to improve the durability of concrete in peat environments using pozzolanic material, one of them is fly ash. Fly ash has pozzolanic properties with fine particle size and can react with lime and water so as to produce material that has binding ability. This research studied the porosity of Ordinary Portland Cement (OPC) containing 25% of fly ash immersed in peat water. Fly ash was used as a cement substitutive. The cylinder concrete strength of the specimen at 28 days were 15, 21 and 29 MPa. The specimens were cured first in fresh water for 28 days and then they were immersed in peat water for 7 and 28 days. The porosity of OPC-FA-15, OPC-FA-21, and OPC-FA-29 immersed in peat water for 28 days were 16.10%, 12.16%, and 11.62% lower than that of immersed in fresh water. Moreover, higher concrete quality would result lower porosity value. Based on the results of the tests it is concluded that the replacement of 25% cement by fly ash for the three concrete grades has better physical properties with immersion in peat water. Keywords : Concrete, fly ash, peat water, porosity
Uji Keterawetan Kayu Karet (Hevea Brasiliensi Muell. Arg) Menggunakan Bahan Pengawet Biocide Pangestu, Hizbulah; Fakhri, Fakhri; Kamaldi, Alfian
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Rubber wood (Hevea brasiliensis, Muell Arg) belongs to the Euphorbiaceae family. Rubber wood is susceptible to fungal attack, especially blue fungus (blue stain). The use of wood preservatives is the most effective way to improve the quality of wood. wood preservation is an understanding that talks about the amount of preservative that seeps into wood. This study aims to determine the durability of rubber wood by three of absorption, retention and penetration. The research method was carried out by cold immersion with a preservative used was Biocide-TCMBT / MBT with a dosage of preservative used 0,25%, 0,50%, 0,75% and 1% of water, with a number of sample repetitions five times with. The results of the absorption test that have been carried out the absorption value of immersion for 36 hours have a higher value than the absorption value of immersion for 5 minutes, 12 hours and 24 hours in all variations of the dosage of preservatives. The results of retention testing that have been carried out show that the retention value of rubber wood samples with a preservative dose of 0,25 %, 0,50 %, 0,75 % and 1% does not meet the retention standard, namely: 8kg / m³ (SNI 03-5010.1, 1999). The results of the penetration test that have been carried out show that the penetration value of rubber wood samples with a preservative dose of 0,25 %, 0,50 %, 0,75 % and 1% does not meet the penetration standard, namely: 5mm (SNI 03-5010.1, 1999). Keywords: Rubber Wood, Biocide, Absorption, Retention, Penetration
Kuat Tekan Dan Sorptivity Beton Dengan Serbuk Kulit Kerang (Anadara Granosa) Reny Akmalia; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study examines the compressive strength and sorptivity of the concrete using powdered shells as a partial replacement of cement. Powder derived from the shells of shell types Anadara granosa who experience burning in the furnace brick and filtered using a sieve # 200. Variations shells used is 4% due to a variation of the optimum. After the trial manufacture of test specimens was performed to compare the nature of the powder concrete with normal concrete shells, then soaking for 7, 28 and 91 days. The results showed the strength of concrete shells powder is lower than normal concrete, concrete Sorptivity powdered seashells higher than normal concrete. From the results show the physical properties of concrete dust shells higher than normal concrete. This happens because the powder concrete shells have more pores and has a lower workability.Keywords: powder shells, Anadara granosa, compressive strength, sorptivity
Kuat Tekan Beton OPC Abu Terbang (Fly Ash) Di Air Gambut Arnef Frenki; 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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study examines the mechanical properties of Ordinary Portland Cement (OPC) concrete and OPC concrete containing fly ash immersed in peat water. Fly ash as a pozzolanic material with high silica content is used as substitution of 25% of the volume of cement. The designed concrete strength was 21 MPa. Concrete Specimens was made in the cylinder mould with a diameter of 105 mm and height of 210 mm. The samples were first cured in fresh water for 28 days and then they were immersed in peat water for 7 and 28 days. The mechanical properties was evaluated by measuring the compressive strength of the concrete specimens. The total number of test specimens was 9 pieces, with 3 test specimens for each variation and testing age, which is without immersion, 7 and 28 days immersion in peat water. The pH value of peat water was ranging from 3.0 to 5.0. The result showed that the compressive strength of OPC concrete immersed in peat water decreased while the compressive strength of OPC concrete containing fly ash was dependent of how long the specimen was cured in peat water. The compressive strength of OPC-21 decreased by 7.08% at 28 days immersion in peat water while the compressive strength of OPC-FA-21 showed an increase of 8.81%.Keywords: Compressive strength, OPC, Fly Ash (FA), peat water
Co-Authors Alex Kurniawandy Alfadh, Mhd Raja Ali Imron Rusadi Arnef Frenki Azizah Fil Ahlia Bambang Arif Hidayat Bambang Sugiarto Dyna Aulia R Elen Tarisa Fakhri Fakhri Fakhri, Fakhri Gunawan Wibisono Intan Monica MG Ismeddiyanto Joni, Mustika M Hari Bhakti Mardiah, Ramona Marlaily Idris Monita Olivia Muhammad Rizki Novan, Andre Nur Alfikri Pangestu, Hizbulah Pratama, Rudy Satriya Rani Putri Handayani Reni Suryanita Reny Akmalia Rian Tri komara Iriana Ridwan Ridwan Riska Yulia Wahyu Rahmadhan, Wahyu Wan Muhammad Nurhud Yogi Saputra, Yogi Yuri Khairizal