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All Journal Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Iskandar Romey Sitompul
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Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Mechanical Engineering

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Ketahanan Mortar Di Lingkungan Asam Dengan Berbagai Tipe Semen Hutapea, Uliarta; Olivia, Monita; Sitompul, Iskandar Romey
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This research study the compressive strength, porosity, weight changes, visual inspection and acidic penetration of mortar OPC cement, mortar PCC cement, and mortar with made by combine of OPC+10% Palm Oil Fuel Ash (POFA). The object test submerge in aquadest, sulfuric acid (H2SO4) with pH 4-5, and peat water. This research result show that the compressive strength increased along with increasing of mortar OPC, mortar PCC and mortar with made by combine of OPC+10% Palm Oil Fuel Ash (POFA) lifes which submerged in aquadest. The compressive strength more decreased, however in mortar PCC cement and mortar with made by combine of OPC+10% POFA have increasing. The porosity test, mortar with made by combine of OPC+10% POFA showed bigger value than mortar OPC and PCC cement. Weigh changes occur with mortar PCC cement when submerged in sulfuric acid and peat water inclined decrease.The mortar PCC cement weight inclined constant. The mortar with made by combine of OPC+10% POFA showed some decreasing but inclined constant. Visual inspection of mortar change become yellow colored when it submerged in peat water. Acid penetration which used phenolphthalein solution showed that mortar OPC cement at 91st day life had onrush by acid effect submerged in sulfuric acid and peat water while the mortar PCC cement and mortar with made by combine of POFA showed more constant condition.   Keyword: OPC, PCC, palm oil fuel ash (POFA), sulfuric acid (H2SO4), peat water,  aquadest, compressive strength, porosity, weight changes, visual inspection and acidic penetration
Analisa Balok Tinggi Beton Bertulang Dengan Menggunakan Metode Strut and Tie Model (Studi Kasus Balok Tinggi Dengan Beban Merata) Munir, Misbakhul; Djauhari, Zulfikar; Sitompul, Iskandar Romey
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Strut-and-tie models (model fighters and binder) is derived from the truss analogy models. Concrete structures planning usually carried out under the assumption of Bernouli and Navier sectional analysis due to the bending moment. Expressed deep beam when the beam span to height ratio of less than five .One alternative approach to address the structural elements such as deep beam approach is to use a strut-and-tie models, namely by dividing the structure in region B (Bernouli) and D (Distrub) and describe the flow of force (load Plath) as the force transfer occurs reinforced concrete structures due to cracks conditions caused by forced, the parameters of the strut-and-Tie Model (STM) is press rod (strut), pull rods (tie) and points stains (stains zone) as a meeting area. The purpose of this thesis is to analyze the correlation among reinforcing volume to the quality of concrete, steel quality, and variation about long-span the deep beam with the conventional method and the method of Strut-and-tie-models (STM) based on ACI is verified by the Program Computer-Aided-Strut -and-Tie (CAST) The results of the analysis of the deep beam with a distributed load at the end of the assignment of conventional method is more efficient than the STM method for long span for spans of 2.5 and 3.0 m to 4.5 STM method is more efficient than conventional methods. This thesis also explain about high concrete reinforcing design manually base on conventional and strut and tie model (STM) in spite of use program computer-aided-strtu-and tie (CAST) In this study also obtain the correlation among the span length (L), the quality of concrete (f'c), the quality of the steel (fy) and the load evenly to the reinforcement ratio, the addition of span length to enlarge the reinforcement ratio, the addition can reduce the quality of the steel reinforcement ratio, and additional load can increase the reinforcement ratioKeyword: Deep beam, distributed load, reinforce volume, strut-and-tie model, concrete.
Kuat Tekan Dan Porositas Beton Semen OPC, PCC, Dan OPC POFA Di Lingkungan Gambut Pradana, Tomy; Olivia, Monita; Sitompul, Iskandar Romey
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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This research study the compressive strength and porosity of concrete OPC cement, concrete PCC cement, and concrete with made by combine of OPC+10% palm oil fuel ash (POFA) cement. The specimens cured in distilled water for 28 days. Then specimens were immersed ini peat environment until 28 days. This research result show there was an increase of compression strength of the concrete with made combine of OPC+10% palm oil fuel ash (POFA) cement and concrete PCC cement after 28 days immersed in peat environment. The percentage of porosity for of concerete OPC cement immersed in peat environment increased compared to the speciemens immeresed in distilled water. For concrete with combine of OPC+10% palm oil fuel ash (POFA) cement and concerete PCC cement decreased after immersed in peat environment. The test result revealed that durability of OPC+10%POFA concrete and PCC concrete in peat environment the well of OPC concrete.Keywords: OPC, PCC, palm oil fuel ash(POFA), peat area
Kuat Tekan Dan Perubahan Berat Mortar Abu Sekam Padi (Rice Husk Ash) Di Lingkungan Air Gambut Ednor, Meirisa; Olivia, Monita; Sitompul, Iskandar Romey
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Peat water potentially damage and attack calcium, reduce the strength and accelerate corrosion of mortar and caused significant degradation in the long term. This study aims to determine resistance acid to cement with using added materials were exposed to acidic water. Two types of hardened cementing materials, such as Ordinary Portland Cement (OPC) and Rice Husk Ash (RHA) will be soaked in regular water and peat water. Cement was replace with 15% of rice husk ash. The acid resistance of cements was test by compressive strength, sorptifity, and porosity. There was a considerable decrease in the compressive strength of mortar OPC after exposure to acid attacks from peat water. This research show mortar with rice husk ash was more resistant in peat water for 91 days.Keywords: Acid, Cement, Peat Water, Rice Husk Ash, Resistance.
Kuat Tekan Beton Kubus Pasca Bakar Menggunakan Ultrasonic Pulse Velocity (Upv) Dan Compression Testing Machine (Ctm) Wicaksono, Adhithiya; Suryanita, Reni; Sitompul, Iskandar Romey
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

High temperature changes may occur at the time of the fire. This can result in discoloration, cracking and loss of strength on concrete. Therefore, a test was conducted to identify the changes of concrete compressive strength. The concrete compressive strength was measured by using Ultrasonic Pulse Velocity (UPV) and Compression Testing Machine (CTM). The specimens used in this study was cube with the size of 150???? 150???? 150 mm. The specimen used consist of 18 cubes with the expected concrete compressive strength of 20, 25 and 30MPa. And then, the specimens were burned in a local brick furnance for about 30 minutes. The test results of post burn concrete, indicated that there was a decrease in the concrete compressive strength for all specimens. Based on the test results of post burn concrete using CTM and UPV, there was a significant difference. On UPV test using Mahure’s Equation compared with the results of CTM has a difference 7.3, 4.4 and 12.5 MPa. Whereas if the test using Nash't’s Equation compared with CTM has a difference 7.1, 4.7 and 8.6 MPa. Therefore, it can be concluded that to identify post burn concrete compressive strength usingCTM more accurate than UPV.Keywords: Compressive strength, concrete after burn, Ultrasonic Pulse Velocity (UPV), Compression Testing Machine (CTM).
Kuat Tekan Beton Pasca Bakar Menggunakan Hammer Test Dan Compression Testing Machine (Ctm) Widianto, Devit; Suryanita, Reni; Sitompul, Iskandar Romey
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

Concrete is a construction material that is widely used in construction because it has many advantages. One of the advantages of concrete construction is that it is resistant to fire. However, the occurrence of a fairly high temperature change will have an impact on concrete, one of which is the change in the strength of the concrete. Therefore, this research was conducted to determine the physical change and the change of strength in post burn concrete. The concrete strength was measured with hammer test and compressive test. 18 concrete cylinder with size of 150 mm and height of 300 mm were fabricated with 3 quality variations, namely 20 MPa, 25 MPa and 30 MPa. Concrete were burned for 30 minutes with the temperatures range between 680-700 oC, and the concrete strength was calculated by using Nash’t and Agunwamba equation. The results showed that the concrete strength predicted by using Nash’t formula was 17, 18 and 21 MPa, respectively whice those predicted Bay pusing Agunwamba was 21, 23 and 26 MPa respectively.Keywords: Compressive strength, concrete after burn, Hammer Test, Compression Testing Machine (CTM).
Kuat Tekan Dan Kuat Lentur Beton Geopolimer Abu Terbang Hybrid Dengan Pecampuran Portland Composite Cement Noviandri, Rizky; Olivia, Monita; Sitompul, Iskandar Romey
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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The use of Portland Composite Cement (PCC) as a substitute material in fly ash geopolymer hybrid concrete will accelerate the geopolymer reaction since the geopolymer becomes more reactive. In this study, the fly ash geopolymer hybrid concrete used 12 M NaOH concentration, modulus of silicate (Ms) 2.5 and 15% PCC cement, and extra water 80 kg/m3. Geopolymer hybrid concrete treatment were carried out at room temperature. Tests carried out were compressive strength and flexural strength at 7 and 28 days. The results showed the compressive strength of geopolymer hybrid concrete against PCC concrete had a decreasing percentage of difference from 34,54% (6,68 MPa) at 7 days to 20,01% (4,49 MPa) at 28 days. Then, the percentage of flexural strength difference decreased from 31.09% (1.25 MPa) at seven days to 28.55% (1.39 MPa) at 28 days. It was concluded that fly ash did not significantly affect the split tensile strength of geopolymer hybrid concrete 28 at days.The results showed that the compressive strength and flexural strength of the geopolymer hybrid concrete were lower than these of PCC concrete.Keywords : Mechanical properties, hybrid geopolymer concrete, PCC, room temperature.
Sifat Fisik Dan Mekanik Mortar Dengan Penambahan Bakteri Baccilus Subtilis Pada Lingkungan Sulfat Ilham, Muhammad; Djauhari, Zulfikar; Sitompul, Iskandar Romey
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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An aggressive environment can have an adverse impact on mortar, because there are reactive chemicals in that environtment. One of the chemicals that no need harmful to mortar is magnesium sulfate. This study used Bacillus Subtilis bacteria as an additive by studying physical and mechanical properties, as well as an innovation to restore mortar using bacteria called Self Healing mortar. In this study there were test objects in the form of a cube measuring 5 x 5 cm with a total of 84 samples. Physical and mechanical properties tests on normal water-immersed normal mortar, normal water-immersed bacterial mortar, and sulfate-water-immersed bacterial mortar were carried out at the age of 28 days and 56 days. The physical properties of the mortar test were sorptivity, unit weight and porosity, while the mechanical properties test testedwere compressive strength. The test results showed that the sorptivity value of the sulfate-soaked bacterial mortar was higher than the normal-water-soaked normal mortar and the normal-water-immersed bacterial mortar at the age of 28 days and 56 days, namely 0.1606 mm / min0.5 and 0.221 mm / min0.5. The results of the weight test showed that the sulfate water-immersed bacterial mortar was lower than the normal water-immersed normal mortar and the normal water-immersed bacterial mortar at the age of 28 days and 56 days, namely 2.002 gr / cm3 and 2.077 gr / cm3. The results of the porosity test showed that the value of the sulfate-immersed bacterial mortar was higher than that of the normal-water-soaked normal mortar and the sulfate-water-immersed bacterial mortar at the age of 28 days and 56 days, namely 14.96 % and 15.22 %, respectively. Meanwhile, in the compressive strength test, the value of the sulfate-immersed bacterial mortar was lower than that of the normal-water-immersed mortar and the normal-water-immersed bacterial mortar at the age of 28 days and 56 days, namely 17.13 MPa and 16.98 MPa, respectively. Based on the data obtained, it could be concludedsaid that bacillus subtillis bacteria couldn’t work well in a sulfate environment.Keywords: Mortar, Bacillus Subtilis, Sulfate Environment, Physical Properties, Mechanical Properties, Self Healing
Sistem Sambungan Momen Tahan Gempa Pada Struktur Baja Bangunan Gedung Siregar, Andi Saputra; Sitompul, Iskandar Romey; Suryanita, Reni
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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Based on SNI 1729 2015, there are two concepts in steel structure analysis and design, namely the concept of Load and Resilience Factor Design (LRFD) and Allowable Strength Design (ASD). The design of steel structures has to take into account the safety against earthquake loads according to the 2017 earthquake hazard map which is an update to the previous earthquake map published in 2010. This study aims to obtain the most effective type of steel structure connection in resisting earthquake loads by comparing 3 types of flexural connections between beam and column. The type of connection examined with study were bolted flange plate moment connection and end plate moment connections using stiffeners with four bolts and eight bolts. In this research a 10 floors building with steel structure is modelled. The dimensions of the building are 20 m x 15 m and the height of each story is 3.5 m except for the first story which is 4.5 m. The structure is analyzed by using SAP2000 version 21 software with LRFD and ASD methods. The building is located in the city of Pekanbaru with soft soil conditions. Based on the design result, it was found that the most suitable type of moment connection on the model is end plate moment connection using a stiffener with eight bolts, with a bearing capacity of the end plate of 4403.59 kN. From the structural analysis using the Direct Analysis Method (DAM) it is found that the internal forces in the structure are smaller when using a new earthquake hazard map. Finally, the connection design for this model by using ASD method is about 40% less efficient than by using the LRFD method.Keywords : LRFD, ASD, moment connections, earthquake hazard map 2017
KARAKTERISTIK KUAT LENTUR BETON RINGAN AKIBAT PENAMBAHAN STYROFOAM PADA DESAIN CAMPURAN BETON Reni Suryanita; Iskandar Romey Sitompul; Zunwanis Zunwanis
Jurnal Sains dan Teknologi Vol 13, No 1 (2014): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.318 KB) | DOI: 10.31258/jst.v13.n1.p%p

Abstract

Penelitian ini dilatarbelakangi usaha pemanfaatkan limbah styrofoam sebagai bahan pelindung kemasan elektronik yangberjumlah banyak di lokasi limbah buangan. Usaha pemanfaatan limbah ini dengan cara mencampurkan styrofoam inike dalam campuran beton. Untuk itu penelitian ini bertujuan untuk mengkaji pengaruh variasi penambahan styrofoamterhadap karakteristik kuat lentur beton ringan. Variasi penambahan styrofoam adalah 0%, 4%, 8%, dan 12% terhadapvolume benda uji. Benda uji yang digunakan berbentuk balok dengan ukuran 15cm x 15cm x 60cm yang berjumlah 15benda uji. Pemeriksaan material dasar pembentuk beton meliputi pemeriksaan berat jenis agregat, pemeriksaan beratvolume agregat, pemeriksaan kadar air agregat, pemeriksaan kadar lumpur agregat, pemeriksaan analisis saringan agregat,dan pemeriksaan ketahanan aus agregat kasar. Hasil penelitian menunjukkan bahwa pada umur 28 hari denganvariasi penambahan styrofoam mulai dari 0% sampai 12%, kuat lentur beton mengalami penurunan kekuatan. Nilaikuat lentur beton tertinggi diperoleh pada saat beton tanpa penambahan styrofoam (0%) yaitu sebesar 4,1198 MPa.Nilai kuat lentur beton terendah diperoleh pada saat penambahan styrofoam 12% yaitu 3,1785 MPa. Dengan demikianpenambahan styrofoam pada campuran beton dapat menurunkan berat satuan beton, sehingga beton menjadi lebih ringannamun juga dapat menurunkan kuat lentur beton ringan tersebut.Kata Kunci : beton ringan, kuat lentur, styrofoam.
Co-Authors Ahmad Zulfitri Amsal Anwary Appriliya Destiyani Chrisfela Wulandari Ednor, Meirisa Ferisma Ratu Giri Fitri Amelia Hasmiyati Hasmiyati Hutapea, Uliarta Ines Junita Sinuhaji Ismeddiyanto Ismeddiyanto Misbakhul Munir Mochamad Romi Monita Olivia Muhammad Farhan Setyawan Muhammad Ilham Nasrullah Nasrullah Noviandri, Rizky Pradana, Tomy Rachmat Hidayat Reni Suryanita Rian Tri komara Iriana Siregar, Andi Saputra Vindy Salim Wicaksono, Adhithiya Widianto, Devit Yuridho Alfi Zulfario Anugrah Pratama Zulfikar Djauhari Zulfikar Djauhari Zunwanis Zunwanis