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Zulfikar Djauhari
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Sifat Mekanik Beton Dengan Menambah Bakteri Bacillus Subtilis Untuk Aplikasi Beton Pulih Mandiri Nevita Elisa; Zulfikar Djauhari; Enno Yuniarto
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 brittle material and has low tensile strength comparing to other material. When the cracks occur, the quality of concrete will decrease, so the new innovations will be created to cover the weakness of concrete. The innovation is self healing concrete that uses bacteria as a medium that can close the cracks of concrete. This research used 25 ml bacillus subtilis with a concentration of 105 cells/ml as admixture to the concrete mix. The test conducted in this research was compressive and flexural tests carried out at the age of 28 dan 56 days. The test consists of two types of loading namely crushing crack test where the concrete cylinder was loaded until it failed and initial crack test when the concrete cylinder was loaded until first crack appeared. For the case of conducted crushing crack bacterial concrete were able to increase compressive strength of 14.71% and flexural strength of 6.96% compared to those of normal concrete at the age of 56 days. Furthermore, initial crack test conducted at bacterial concrete was able to withstand compressive and flexural loads of 17.15% and 3.17% higher than those of normal concrete. Keywords: concrete, crack, bacillus subtilis, compressive strength, flexural strength
Pengaruh Flat Slab Terhadap Keruntuhan Progresif Pada Struktur Gedung Tidak Beraturan Roni Suhendra; Zulfikar Djauhari; Ridwan Ridwan
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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Technological developments in the field of construction are currently more advanced, the structure of the building not only an regular but also irregular. Terraced building structure in the shape of irregular very influential towards the collapse of the building. The collapse of the building can be the collapse of the natural and the artificial collapse. It is a natural collapse collapse caused by load capacity by building or building exceeds the ability of the structure personally. Potentialities of the failure of the structure due to the collapse, can lead to progressive collapse. This research aimed to analyze the effect of flat slab to the collapse beharfour of irregular building structures, and determine the type of collapse that occurred at irregular building structures. This research was conducted by analyzing the elements of the structure destroyed in advance the result of addition of maximum load. The analysis done by eliminating one or more of the critical column based on General Service Administration (GSA) code. Examination of structural strength using finite element based software, valuebased Demand Capacity Ratio (DCR). Irregular building structures have a progressive collapse when the value of the DCR is more than 1 that. The results of the analysis indicated progressive collapse did not occur on the structure of the building, due to irregular use of the building elements that form the structure of a flat slab. The collapse happened on only some elements of the structure of the building, both elements of the structure of the beams as well as elements of the structure column. Since its collapse did not occur on the structure of the building, so the building collapse type could not be seen. Keywords: Progressive collapse, irregular structure, flat slab, GSA, DCR, finite element program.
Analisis Numerik Pengaruh Suhu Tinggi Terhadap Momen Kapasitas Penampang Elemen Balok Beton Bertulang Florisa Florisa; Reni Suryanita; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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The heat during the fire will change the nominal moment capacity of reinforced concrete (RC) beam. The purpose of this study is to identify the nominal moment capacity of RC beam due to exposure of high temperatures with the heating temperatures of 500°C, 700°C, 800°C, and 1000°C. The duration of the heating time in each temperature is 0,5 hours, 1 hour, 1,5 hours, 2 hours, 3 hours, and 4 hours. In this study, the moment capacity was calculated by using the cross-section reduction method proposed in Eurocode EN 1992 1-2 (2004). The concrete strength and the yield strength of material used in this study was 35 MPa and 400 MPa, respectively. The results showed that the residual moment capacity of RC beam at temperature of 500°C was 95.835%, at temperature of 700°C was 82.255%, at temperature of 800°C was 71.238% , and at a temperature of 1000°C was 51.743% from the moment capacity of the normal concrete strength. Keywords : high-temperature, reinforced concrete beam, Isotherm 500°C, moment capacity.
Pengaruh Variasi Volume Pengenceran Bakteri Bacillus Subtilis Terhadap Sifat Fisik Beton Pada Lingkungan Sulfat Suziela Saila; Zulfikar Djauhari; Enno Yuniarto
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 a material that generally becomes a necessity as a support for infrastructure. Concrete has various advantages so it is chosen in the field of construction. During the construction, several weakness were found w in concrete that can make cracks and cause performance in concrete being decreased. To overcome this issue, cracks on concrete can be self-recovered, called self healing concrete. In this study, bacteria Baciluus Subtilis was used as a medium that can restore cracks in concrete. In this study, ingredients added with bacillus subtilis bacteria with a concentration of 105 cells / 20 ml, 105 cells / 25 ml, and 105 cells / 30 ml of 25 ml in each casting were then treated in sulfate solution and studied physical properties. Normal concrete is compared with bacterial concrete with different concentrations at 28 and 56 days of treatment in water sulphate. . Concrete testing performed is workability, porosity, and shrinkage. The results of this study indicate that the slump in sulfur bacteria 105 cells / 20 ml is 9.50 cm, porosity in the concrete bacteria sulfate 105 cells / 20 ml is lower than the other types of concrete with a value of 13.54%. Shrinkage on concrete sulfate bacteria 105 cells / 20 ml is lower than other types of concrete with shrinkage of 0.071 mm or 71 μm. So that it can be concluded that the bacterial sulfate 105 cells / 20 ml concrete is the most optimum with added bacterial ingredients in the sulfate environment.Keywords: Concrete, Bacillus subtilis bacteria, physical properties, sulfate, concentration
Pengaruh Penggunaan Soil Stabilization Terhadap Sifat Mekanik Beton Dengan Agregat Halus Berkadar Lumpur Tinggi Muhammad Gilang Indra; Ismeddiyanto Ismeddiyanto; Zulfikar Djauhari
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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This research was conducted to identify soil stabilization effect on mechanical properties of concrete with high mud content. According to SNI 03-2461-2002 code, the fine aggregate should must contain mud more than 5% of as weight. In this research, soil stabilization of 1% from mud weight was added to concrete mixtures. The percentages of mud added to the concrete mixture in this research were 5%, 10%, 15%, 20% and 23%. A 15x30 cm cylinder is curing in normal water for 28 days to study its compressive strength, tensile strength and elasticity modulus with expectation of 20 MPa in the concrete quality. The result of the research shows an optimum increase in the compressive strength to the concrete with 20% variation mud content. By adding the soil stabilization, compressive strength of the concrete is increased by 30.14% compared to a concrete without the soil stabilization. The value of tensile strength of concrete with 5% variation mud content added soil stabilization lower by 2.60% compared to a variations of a concrete without mud content. The value of the elasticity modulus of concrete with 23% variation mud content added soil stabilization lower by 152.34% compared to a variations of a concrete without mud content. This research concludes that a high mud level concrete with soil stabilization has a higher concrete quality compared to the a high mud level concrete without soil stabilization.Keywords : Compressive strength, tensile strength, elasticity modulus, soil stabilization, mud
Sifat Fisik Beton Pulih Mandiri Dengan Memanfaatkan Bakteri Bacillus Subtilis Widika Arfa A; Zulfikar Djauhari; Enno Yuniarto
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

As the technology evolves, the utilization of micro-organisms such as bacteria has been developed and used as concrete mixtures. This was inspired by the ability of the bacteria which is able to repair the cracks on concrete, as known as self healing concrete. Therefore, properties of self healing concrete needs to be reviewed. This research used bacillus subtilis chemical solution with amount of 25 ml and with the concentration of 105 cells/ml. Research methodology consisted of adding bacteria solution on concrete mixtures. Cylinder compressive tests were initiated on normal concrete and bacterial concrete on age of 28 days and 56 days. Physical property of concrete was evaluated according to its workability, porosity, and shrinkage rate. The results showed that the slump on bacterial concrete was 80 mm. This indicated bacterial concrete had lower consistency than normal concrete. Porosity results on bacterial concrete was better with deviation of 11,241% compared to normal concrete on age of 28 days and low rate of shrinkage, i.e. 61,50 µm. Hence, it could be concluded that physical properties of self healing concrete is better than normal concrete.Keywords : bacillus subtilis bacteria, self-healing concrete, physical properties ofconcrete
Pengaruh Penambahan Steel Slag Dan Abu Terbang (Fly Ash) Terhadap Sebagian Sifat Beton Segar Dan Beton Keras Randi Yuzti Ramadhan; Alex Kurniawandy; Zulfikar Djauhari
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 explained the effect of the addition of fly ash substitution of cement and steel slag substitution of sand against most properties of fresh concrete and hard concrete. This study aimed to determine the effect of fly ash and steel slag to most properties of fresh concrete and concrete hard to compare the results obtained with normal concrete so it can produce higher levels of tolerance in using a mixture of fly ash and steel slag on concrete. Testing and analysis done is workability, compressive strength, tensile strength, absorption, and porosity variations additions to the concrete normal quality 0% fly ash + 0% steel slag and 10% steel slag + 10% fly ash using portland composit cement with ordinary water immersion for 28 and 56 days. From the research results of mixing 10% steel slag + 10% fly ash in concrete obtained lower results on the testing of compressive strength and tensile strength apart than normal concrete, but the test results are still within the limits of the quality of the plan in order to obtain higher levels of tolerance is 10% , As for testing the absorption and porosity values generated in the concrete mix is higher than normal concrete.Keywords: steel slag, fly ash, workability, compressive strength, tensile strength, absorption, and porosity.
Sifat Fisik Beton Dengan Bahan Tambah Bakteri Bacillus Subtilis Pada Lingkungan Sulfat Kurnia Desmilestari; Zulfikar Djauhari; Enno Yuniarto
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 common material used in structures, such as foundations, roads, and bridges. Concrete has a high compressive strength, but the tensile strength of the concrete is low. At the time the tensile strength limit of concrete is reached, the crack will exist on the tension side of the concrete. The use of bacteria as an added ingredient in concrete is an innovation to reduce the crack. According to Pangeran and Karolina’s research (2017), the addition of bacteria to the concrete can also increase the compressive strength of the concrete. In this research, a 25 ml of Bacillus subtilis solution with the concentration of 105 CFU/ml were added to a concrete mixture. The concrete was soaked in normal water and sulfate solution with the concentration of 150 ppm and the physical properties were examined such as workability, porosity, and shrinkage. There were 3 variations in the specimens, namely normal concrete (BN), bacterial concrete (BB), and bacterial concrete soaked in sulfate solution (BBS). Theresults of this study indicated that slump on specimen BBS was 8.05% and 18.98% higher than specimen BN and BB, respectively. The porosity on specimen BBS was 11.07% and 14.47% higher than specimen BN and BB, respectively. Lastly, the shrinkage on specimen BBS was 1.42% and 18.54% higher than specimen BN and BB, respectively. So it can be concluded that bacteria does have a good effect on the physical properties and soaking the bacterial concrete on the sulfate can adversely affect the physical properties of concrete.Keywords : concrete, bacillus subtilis bacteria, sulfate, physical properties
Pengaruh Lendutan Akibat Variasi Spasi Tulangan Geser Pada Balok Beton Bertulang Dengan Metode Finite Element Anggi Agusstiawan; Reni Suryanita; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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At the time of installation the distance between the shear reinforcement is not planned properly. This affects the serviceability of reinforced concrete blocks. This study aims to see the effect of the planned shear reinforcement which is not according to the initial plan. So, an analysis of the effect of shear reinforcement on deflection was carried out using the LUSAS Finite Element. The results of the LUSAS Finite Element analysis show that the BS2 beam model with a maximum load of 40.5 kN has decreased deflection by 33.53 % against the planning according to SNI 03-2847-2019 (BS1) which has a maximum load of 46.55 kN. Furthermore, for the BS3 model with a maximum load of 38.69 kN, the deflection decreased by 35,03 % from the planning according to SNI 03-2847-2019 (BS1) which had a maximum load of 46.55 kN. It can be concluded that the spacing of the shear reinforcement can affect the deflection of the beam. Keywords : Beam, Shear Reinforcement, Deflection, LUSAS
Analisis Perilaku Portal Beton Bertulang Dengan Tulangan Fibre Reinforced Polymer Suriyati Suriyati; Ridwan Ridwan; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Fiber reinforcement is currently widely used as an alternative to conventional steel reinforcement at reinforced concrete because its material properties are resistant to corrosion and have a high tensile strength. This research aims to analyze the comparison of reinforced concrete portal behavior using FRP and steel reinforcement. The model used in the analyzed is portal 2D with and without shear wall that use limits of based on ACI 440.1R-2015 and SNI 03-2847-2013. The analyzed result revealed that the use of FRP bar can reduce the amount of bars significantly. For the case of concrete portal without shear wall was 25% less than compared to that FRP of steel bars. Moreover, for the case of portal with shear wall, the use of FRP material can reduce the amount at bars used until 33%. This can be inferred because ultimate strength and modulus elasticity of CFRP is 2070 MPa and 152000 MPa, while ultimate strength of conventional steel is only MPa with the modulus of elasticity of 200000 MPa. Keywords: Reinforcement FRP, Conventional Steel Reinforcement, Reinforcement CFRP
Co-Authors Afwan Eka Putra Ahmad Obi Narman Ahmad Zulfitri Alex Kurniawandy Andi Wijaya Anggi Agusstiawan Ardian Yolanda Bagus Rizkya putra Debby Mayangsari Dhika Fazrian Dian Nanda Islami Enno Yuniarto Ermiyati Ermiyati Fajar Priandoko Florisa Florisa Garcya, Muhammad Gala Harriad Akbar Syarif Heru Setiadi Ilham Sordiman Iskandar Romey Sitompul Ismeddyanto, Ismeddiyanto Kurnia Desmilestari Mirza Afrian Monita Olivia Muhammad Gilang Indra Muhammad Rizky Nasrullah Nasrullah Nevita Elisa Ockto Perry P Harahap Prayogo Pratama Rachmat Hidayat Rahmatul Firdaus Randi Yuzti Ramadhan Reni Suryanita Rezky Rendra Rezky Yusman Efendy Ridwan Ridwan Ridwan Ridwan Roni Suhendra Suriyati Suriyati Suziela Saila Syamsul Fikri Tengku Tantoni Yahya Widika Arfa A Yonna Rosianda Yuridho Alfi