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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains SIKLUS: Jurnal Teknik Sipil Riau Journal of Empowerment Journal of Applied Materials and Technology JURNAL ILMIAH GLOBAL EDUCATION Jurnal Teknik Sipil Institut Teknologi Padang SAINSTEK Jurnal Teknologi & Rekayasa Sipil
Iskandar Romey Sitompul
Universitas Riau
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Transportation Other

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Kuat Tekan Dan Ultasonic Pulse Velocity (UPV) Beton OPC Dan OPC Abu Sekam Padi Untuk Aplikasi Di Lingkungan Gambut Muhammad Farhan Setyawan; Iskandar Romey Sitompul; Monita Olivia
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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This research study the compressive strength and ultrasonic pulse velocity (UPV) of OPC and OPC rice husk ash (RHA) concrete. Test will be measured after 28 days immersed in peat water. Specimens will be immersed in peat water after 28 days cured in normal water. Compressive strength of OPC concrete showed biggest value than OPC with admixture RHA 5% and 10% which is increasing amount of RHA for subsitute cement will decreasing compressive strength. Test UPV of the specimen showed OPC RHA 5% being best quality than other.Keywords: Durabilty, OPC, RHA, peat environment.
Pengaruh Variasi Volume Konsentrasi Bakteri Bacillus Subtilis Terhadap Sifat Mekanik Beton Yuridho Alfi; Zulfikar Djauhari; Iskandar Romey Sitompul
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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Concrete is the most favourite material used in construction. Concrete has some advantages, but in some cases, concrete also has drawbacks. One of the drawbacks founds during the use of concrete is that its tensile strength is low when the tensile strength of concrete is exceeded the cracks will exist. The inovation to solve this is theintroduction of self healing concrete that utilize bacteria bacillus subtilis in a concrete mix. This bacteria can repair cracks in concrete. In this research, bacteria bacillus subtilis were used with different concentration that is 105 cells/20 ml, 105 cells/25 ml and 105 cells/30 ml. Mechanical properties test carried in this research, namelycompressive strenght and flexural strength. The test consist of two loading types namely broken cracks where the concrete was loaded until it fully destroyed and loading up until initial cracks occured. The test was carried after 28 and 56 days of curing. Theresult shown that the concrete with 105 cells/20 ml concentration of bacillus subtilis had the highest compressive strength with increasement by 28,70 % and 34,50 % than normal concrete at 28 and 56 days. The highest flexural strength value has shown in concrete with 105 cells/20 ml.Keyword : Concrete, Cracks, Bacillus Subtilis, Mechanical Properties, Compressive Strength, Flexural Strength
Pengaruh Natrium Tripolyphosphate Terhadap Sifat Fisik Beton Cor Di Dalam Air (Under-Water Concrete) Hasmiyati Hasmiyati; Ismeddiyanto Ismeddiyanto; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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In the implemetation of concrete building construction there is a problem when casting in water. To solve this problem, sodium tripolyphosphate use in the concrete mixture. The purpose of using sodium tripolyphosphate is to accelerates the process of concrete hardening in water as well is to increase the binding of fresh concrete material. The alternative to maintain the quality concrete in water filler was needed. The filler used namely stone ash (self compacting concrete). The stone ash is hygroscopic and easy to obtain. The use of stone ash is to increase the viscosity of fresh concrete while reducing the tendency of segregation and bleeding in fresh concrete. The goal of the study is to determine Sodium Tripolyphosphate effect to the physical properties of under water concrete and to obtain the optimum composition of constituents of under water concrete. Sodium Tripolyphosphate which is used in this study is the addition of variations of 5%, 10% and 15% to the weight of cement. While the amount of stone ash used is 10% to the weight of fine aggregate. The slump flow of 5%, 10% and 15% sodium tripolyphosphate is 620 mm, 570 mm and 400 mm, respectively. The volume weight concrete with 5%, 10% and 15% sodium tripolyphosphate are 2274.98 kg/m3, 2312.54 kg/m3 and 2288.14 kg/m3, respectively. Whereas the porosity concrete with 5%, 10% and 15% sodium tripolyphosphate respectively were 23.10%, 21.97% and 22.55%. From the FTIR test results, it is showed that 10% sodium tripolyphosphate is the mixture were more stable compared to other variations.Key words: Sodium tripolyphosphate, under water concrete, stone ash, variation, percentage
Evaluasi Kinerja Struktur Rangka Baja Gedung Bertingkat Beraturan Tahan Gempa Berdasarkan SNI 1729 2015 Appriliya Destiyani; Iskandar Romey Sitompul; Reni Suryanita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Each building have to be designed so that the building is safe from earthquake load. The purpose of the study is to analyze the drift ratio, reaction force and structural performance at steel structures by using Direct Analysis Method (DAM) and Effective Length Method (ELM). the building structure is analyzed for earthquake loads based on the 2010 earthquake map and 2017 earthquake map. In the study, a 10-story building with a length of x 4 m and y 5 m, a ground floor height of 4,5 m and floors 1-10 is 3,5 m. The total building height is 36 m using IWF 478,447.60.60 and IWF beams 406,403.24.26. The structural system uses an open system without bracing. The structural analysis uses SAP2000 software. The results of the analysis for the DAM and ELM methods show that the deviation between levels is by the provisions of RSNI3 1726 201X, which is less than the deviation between permit levels of 0,0692 m for the ground floor and 0,0538 m for floors 1-10. Structural performance using pushover analysis based on FEMA 356, for the DAM and ELM methods results in an IO (Immediate Occupancy) level of performance with a drift value below 0,7%. Structural analysis found that the force in the DAM method was 1,4% smaller than the ELM method. This is because in the DAM method there is an increase in notional load at the nodal point at all levels. Analysis of the force on the 2017 earthquake map is smaller by 9,8% compared to the 2010 earthquake map. This is due to the acceleration value of the response spectrum on the 2017 map for S1 and Ss by 0,299 and 0,236, while for the 2010 earthquake map for S1 and Ss by 0,441 and 0,274.Keywords: Portal structure of Steel, performance, moment, stress ratio, earthquake hazard map 2017, earthquake hazard map 2010
Kuat Tekan Dan Sorptivity Beton Abu Terbang Dengan Perawatan Wet-Dry Di Air Gambut Fitri Amelia; Monita Olivia; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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This study examines the compressive strength and sorptivity of PCC concrete and PCC-FA concrete subjected to the exposure of peat water. The specimens were treated with two different, namely static and wet-dry exposure. In the static exposure, the sample were curedcontinuously in the peat water at the age of 7 and 28 days. In the wet-dry exposure, the samples were put in the cycles of wet and dry during the curing by using peat water. Fly ashwas used to increase the compressive strength and sorptivity of concrete during wet-dry cycles immersion since the wet-dry cycle in peat water is considered as the worst environmental condition that can affect the strength of concrete. The compressive strength ofPCC (static), PCC-FA (static) and PCC-FA (wet-dry) were increased at 28 days immersion in peat water, respectively by 7.24%, 20.45% and 12.89%. The compressive strength of PCC(wet-dry) decreased at 28 days immersion in peat water by 4.31%. The sorptivity was inversely proportional to the results of compressive strength. Based on the test results, it wasconcluded that the use of fly ash in concrete that experiences a wet-dry constant state could improve the quality of concrete if immersed in peat water.Keywords : Fly ash concrete, fly ash, wet-dry cycles, peat water, PCC.
Pengaruh Variasi Penambahan Naoh Pada Kuat Tekan Mortar Geopolimer Abu Terbang Dengan Opc Sebagai Tambahan Ferisma Ratu Giri; Monita Olivia; Iskandar Romey Sitompul
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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This study investigates the effect of NaOH molarity on geopolymer mortar with Ordinary Portland Cement in addition to geopolymer mortar. The intent of using Ordinary Portland Cement is to produces hybrid geopolymer concrete which can harden without high temperatures. Mortar was treated at room temperature (20-25 0C), then testing after mortars aged 7 and 28 days. The variation of molarity of NaOH used was 10 M, 12 M, and 14 M, while the ratio of silicate modulus, Ms ( Na2SiO3 / NaOH) and the percentage of OPC added to the mixture were 2,5 and 15% of the weight of fly ash, respectively compressive test was conducted to the specimens. The results showed that mortar with 12M NaOH had a compressive strength of 15,47 MPa, while the compressive strength of specimens with 8M, 10M, 14M and 16M were 10,93 MPa, 14 MPa, 13,20 MPa and 10,67 MPa, respectively. The optimal compressive strength is obtained on addition 12M NaOH. Keywords: Compressive strength testing, geopolymer, hybrid geopolymer, mortar, NaOH molarity, silicate modulus ratio, ordinary portland cement..
Kuat Tekan Dan Waktu Ikat Beton Abu Terbang Di Air Gambut Dengan Metode Statis Dan Metode Wet-Dry Zulfario Anugrah Pratama; Monita Olivia; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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This study examines effect of peat water to the setting time and compressive strength of PCC concrete, and PCC fly ash concrete (PCC-FA). In this study, fly ash was used to replace 25%of weight of cement. This specimen was designed to have the compressive strength of 28 MPa at 28 days. All specimens were cured with two different curing system, static and wet-drysystem. The concrete sample were cured continuously on peat water for 7 and 28 days. While on wet-dry system, the samples were cured by turns wet (soaked on peat water) and dry for 7and 28 days. Peat water had a pH value of 3.0-5.0. The results showed that the addition of fly ash was able to extend the final setting time from 113 minutes to 208 minutes. The compressive strength of PCC (static), PCC-FA (static), and PCC-FA (wet-dry) wereincreased at 28 days immersion in peat water with each increase of 7.24%, 20.45% and 12.89%, respectively. While the compressive strength of PCC concrete (wet-dry) was decreased at 28 days immersion in peat water with a decrease of 4.31%. Based on the test results, it was concluded that the wet-dry cycle adversely affected the concrete strength; however, fly ash addition in the mixture can increase the concrete resistance from the wet-drycycle.Keywords: Fly Ash Concrete, Fly Ash, Wet-Dry, Setting Time, Compressive Strength, Peat Water, PCC
Setting Time Dan Kuat Tekan Beton Pofa Dengan Tambahan Silica Fume Di Air Gambut Ines Junita Sinuhaji; Iskandar Romey Sitompul; Monita Olivia
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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As a province with the largest area of oil palm plantations in Indonesia, oil palm production in Riau continues to increase. When palm oil production increases, the residual waste of production also increases and has not been optimally utilized. This research aims to analyze characteristics of POFA (Palm Oil Fuel Ash) concrete by using additive silica fume with PCC (Portland Cement Composite) concrete as control. POFA is used as a partially substitute material of cement volume with variations 0% and 20%, which silica fume as addition material has constant levels in 10% of cement volume. In this research, the compressive strength and setting time of the concrete were tested. All variations were made and passed the curing stage for 28 days in plain water. The compressive strength test was carried using a cylindrical mold measuring 105 X 210 mm, while the setting time testing was carried out separately using the vicat tool. After the curing process, the specimens were immersed in peat water with immersion variations, namely 0.7, and 28 days. Setting time of PCC concrete is the longest binding time compared to other variations, in this research there are three variations. The final binding time of 145 minutes and the fastest final binding time, namely the variation with POFA 20% with the final binding time of 96 minutes. Concrete compressive strength was tested mechanically at 0, 7, and 28 days of peat water, while setting time was tested separately. The compressive strength plan is 20 MPa and peat water as immersion water of concrete has a pH 4.0-5.0. The results shows that the compressive strength of POFA variation concrete was higher than control concrete at 0 days of immersion with the highest compressive strength value at POFA 0% of 25,84 MPa. At 28 days of immersion, POFA 0% with silica fume was higher than the control. Increase level of POFA in mixture decrease the compressive strength to 21,18%. The lowest compressive strength than the control at POFA 20% of 25,76 MPa at 28 days. Based on the results of the test, it is concluded that the use of POFA affects the results of compressive strength and setting time. The results of the compressive strength test showed that more POFA in the concrete, the compressive strength tended to decrease at  age of 0, 7,  and 28 days. In testing the setting time, POFA has the effect of shortening the initial setting time and the final setting time. More levels of POFA decreased the setting time in this study. Keywords : Palm Oil Fuel ASh, Silica fume, PCC, Peat Water, Setting Time, Compressive Strength.
Durabilitas Mortar Geopolimer Di Air Gambut Chrisfela Wulandari; Monita Olivia; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
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This research studies the durability of OPC mortar, geopolymer mortar based fly ash and geopolymer mortar based palm oil fuel ash in acidic environment like peat water and netral environment like aquadest. This mortars will testing by mechanics and physical behaviour likes visual inspection and compressive strength after submerged in that water at age 7, 28, 91 and 120 days. The range of pH by peat water are 4,0-4,5. Geopolymer mortar based fly ash and geopolymer mortar based palm oil fuel ash use modulus activator (Ms)= SiO2/Na2O= 1 and %Na2O = 19%. This research show that the compressive strength of geopolymer mortar based fly ash (FA) increase in peat water and aquadest immersion, whereas the compressive strength of geopolymer mortar based palm oil fuel ash (POFA) decrease because the two type of this water immersion. The compressive strength of OPC mortar increase in aquadest immersion, but decrease in peat water immersion. Visual inspection of OPC mortar and geopoymer mortar based POFA changes become brown colored in peat water immersion.Keywords: durability, OPC, fly ash, palm oil fuel ash, geopolymer, peat water, aquadest, compressive strength, pH, alkali activator, and acidic environment
Pengaruh Variasi Konsentrasi Bakteri Bacillus Subtilis Terhadap Sifat Mekanik Beton Di Lingkungan Sulfat Ahmad Zulfitri; Iskandar Romey Sitompul; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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Concrete has several advantages and disadvantages. One of the weaknesses of concrete is crack. The strength of concrete will decrease if there are cracks. One of the innovations that can overcome the problem is by using bacteria as a concrete mixture material. One way to overcome cracks in concrete is to add Bacillus subtilis bacteria. Bacillus subtilis bacteria is able to repair cracks in concrete. This study used concrete with a mixture of Bacillus subtilis bacteria with variations in the volume of different concentrations namely 105 cells/20 ml, 105 cells/25 ml and 105 cells/30 ml. Bacterial concrete soaked in the sulfate solution. This study examined the mechanical properties of concrete, namely compressive strength and flexural strength. Testing is carried out at the concrete age of 28 days and 56 days after soaking the sulfate solution. Based on the results of the study obtained that the volume of the best concentration of Bacillus subtilis bacteria on concrete is 105 cells / 20 ml, with the highest compressive strength test results with an increase of 28.16% and 22.94% against normal concrete at the time of testing at the age of 28 and 56 days, the highest flexural strength test results with an increase of 11.83% and 14.74% against normal concrete at the time of testing were 28 and 56 days old in the sulfate environment.Keyword : cracks, Bacillus subtilis, sulfate, compressive strength, flexural strength
Co-Authors Agus Ika Putra Ahmad Zulfitri Alex Kurniawandy Alfian Kamaldi Amsal Anwary Appriliya Destiyani Chrisfela Wulandari Ednor, Meirisa Edy Saputra Enno Yuniarto Ferisma Ratu Giri Ferisma Ratu Giri Ferry Fatnanta Fitri Amelia Gunawan Wibisono Hasmiyati Hasmiyati Hifzil Hanif Hutapea, Uliarta Ines Junita Sinuhaji Ismeddyanto, Ismeddiyanto Januar Fitri Khairul Amri Leo Sentosa Mardani Sebayang Misbakhul Munir Mochamad Romi Monita Olivia Monita Olivia Muhammad Farhan Setyawan Muhammad Ikhsan Muhammad Ilham Nasrullah Nasrullah Nila Kamelia Noviandri, Rizky Pradana, Tomy Rachmat Hidayat Reni Suryanita Rian Trikomara Iriana Rizqy Ridho Prakasa Ronaldi Zulkifli Rudy Satriya Pratama Satibi, Syawal Siregar, Andi Saputra Vindy Salim Wicaksono, Adhithiya Widianto, Devit Yoga Ornando Yuridho Alfi Zulfario Anugrah Pratama Zulfikar Djauhari Zulfikar Djauhari Zunwanis Zunwanis