Article Per Year (5 Year)
p-Index From 2021 - 2026
0.702
P-Index
This Author published in this journals
All Journal Jurnal Sains dan Teknologi Jurnal Teknik Sipil Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains APTEK
Zulfikar Djauhari
Unknown Affiliation
Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Mechanical Engineering Transportation

Published : 39 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 39 Documents
Search

 1   2   3   4 
Kuat Tekan Mortar OPC Abu Sekam Padi Pada Suhu Tinggi Mirza Afrian; Monita Olivia; Zulfikar Djauhari
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

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

Abstract

This research examines the partial replacement of cement mortar with the OPC by rice husk ash as a binding material. Rice husk Ash (RHA) has used silica content of 90%. Compressive strength was tests are carried out on the basis of the percentage of rice husk ash and its time variations of the treatment. Variation of rice husk ash used is 10%, 15%, and 20%. Samples was curing in water for 28 days before furnace with variations of temperature 250°C, 500°C, and 750°C for 3 hours. This research showed that a mixture of mortar with the replacement of the 15% rice husk ash cement against the OPC provides optimum results against compressive strength value, not only on the maintenance of room temperature but also at 250°C and 500°C. Compressive strength of all types of cement has increased at temperature of 250. The higher the replacement of cement by rice husk ash will weaken the compressive strength of mortar, but spalling and cracking doesn't happen on every OPC cement replacement by RHA.Keywords: Cracking, high temperature, OPC, rice husk ash, spalling,
Perbandingan Kinerja Rangka Terbuka Dengan Dan Tanpa Pengaruh Flat Slab (Studi Kasus Gedung Transmart Pekanbaru) Syamsul Fikri; Zulfikar Djauhari; Reni Suryanita
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

A flat slab is a building structure component that uses a portal system and a plate that is directly supported by a column with or without plate thickness at the top of the column (drop panel). Flat slabs are still rarely used in the city of Pekanbaru, because there are still many conventional plates used. To determine the performance of each structural system, it is necessary to examine the influence at the flat slab and conventional plate system to the performance of the structure of the building. The purpose of this research is to identify the effect of flat slabs on the reinforced concrete open frame structure systems and comparing them with conventional structural systems. Two models were constructed, model 1 was the original Transmart Pekanbaru Building model, while model 2 replaced the flat slab on the ground floor with a 600x400 beam. The results showed that the story drift value in model 1 was very large compared to a model 2 with a comparison value of 60,00 in the direction X and 11,50 in the direction Y. Based on story drift in model 1 and model 2, the building structure has met the requirements for the story drift permit of 0.6 on the ground floor and 0.1 on the 1st to 3rd floors. So that it can be concluded that conventional systems are better than flat slabs because beam factors greatly affect the displacement of a building structure.Keywords: flat slab, conventional plate, story drift
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
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

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
Sifat Fisik Dan Mekanik Mortar Dengan Penambahan Bakteri Bacillus Subtilis Dian Nanda Islami; Zulfikar Djauhari; Enno Yuniarto
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

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

Abstract

The development of construction technology has progressed quite rapidly, especially in the field of building materials. One form of technological advancement in building materials which has been developing until now is mortar. Mortar is a mixture of cement, fine aggregate, water and stirred until homogeneous. This study used Bacillus Subtilis as an added ingredient by examining it’s physical and mechanical properties, as well as an innovation in crack recovery in mortars using bacteria called self healing Mortar. Tests were carried out on normal mortar and bacterial mortar aged 28 and 56 days. The physical properties of the mortar tested were porosity, sorptivity and unit weight, while the mechanical properties tested were compressive strength. The results showed that the porosity value of bacterial mortality was smaller than that of normal mortality at 28 days and 56 days with a value of 12.53% and 11.8%. The results of the bacterial mortar unit weight test showed a greater value than normal mortar at the age of 28 days and 56 days with a value of 2.12 gr / cm3 and 2.184 gr / cm3. The soprtivity test results showed that the value of sorptivity mortar bacteria was lower at the age of 28 days and 56 days compared to normal sorptivity mortar with values of 0.1092 mm / min0.5 and 0.0861 mm / min0.5. The compressive strength test results showed that the compressive strength value of bacterial mortar was greater than normal mortar at the age of 28 days and 56 days with values of 20.94 MPa and 21.61 MPa. Based on these data, it can be concluded that the mortar with the addition of bacillus subtilis bacteria is better than normal mortar. Keyword : Mortar, Bacillus Subtilis, Physical Properties, Mechanical Properties, Self Healing
Analisis Kuat Lentur Murni Sistem Balok Bataton Semi Pracetak Bagus Rizkya putra; Ismeddiyanto Ismeddiyanto; Zulfikar Djauhari
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

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

Abstract

Semi precast beam is unitary beam element that supports the load in longitudinal direction, the beam is unification of semi precast concrete with 5 MPa strength of precast concrete and cast in place with 17.5 MPa strength which were combined to create unified element of semi precast beam structure. Semi precast beams made the object of review using three beams type with dimensional variations as high as beam semi precast one layer was 140 mm, beam semi precast one layer 290 mm height, and beam semi precast two layers 290 mm height to be analyzed using finite element analysis Abaqus 6.12. Semi precast beams model will be given the burden of axial load has increased. Beams will be analyzed the influence of pure bending strength received by the relationship load - deflection parameters, the relationship moments - curvature and crack pattern that occurred three types of beams. Based on analysis results obtained with Abaqus 6.12 axial load greater value with increased dimensions and beams will be more stiffness. The maximum axial load value capable detained by the three types of semi precast beams at 8,61 kN for semi precast beams one layer was 140 mm height, 29.64 kN for semi precast beams one layer of 290 mm height and 25 kN for semi precast beam two layers of 290 mm height. Evaluation of cracking that occurs is cracked bending pure occur in areas of bending moment largest and in areas of tension on the beam.Keywords : Beam, semi precast, precast concrete, cast-in-place concrete, the finite element analysis
Perbandingan Kinerja Pilar Jembatan Menggunakan Metode Direct Displacement Based Design Dan Capacity Spectrum Method Ockto Perry P Harahap; Zulfikar Djauhari; Alex Kurniawandy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

The structure usually design base on the elastic analysis that would be multiplied by load factor to simulate the ultimate condition. Actually the behavior of building subject to seismic load are in-elastic. Evaluation to assess inelastic condition of the building during the earthquake are required to obtain assurance that a satisfactory performance . Analysis and performance evaluation can be done with the concept of performance-based seismic design. In this study, there are two performance-based analytical methods used, the method of Direct Displacement-Based Design (DDBD) and Capacity Spectrum Method (CSM). Structures analyzed in this research are the bridge pier with seismic load plan by RSNI 2833:201X. Value of displacement, base shear force, effective time, and damping produced by the method DDBD will be compared with the CSM. Result of analysis by the method of DDBD is the greatest displacement target, that is 0.7304 m, while the displacement by the method of CSM is 0,027 m. Base shear forces (V), results of DDBD, have 265.98 kN smaller than the CSM. However, the effective damping (ξeff) and effective time (Teff), the results of the analysis DDBD, have greater value when compared with the results of the analysis of CSM. Performance evaluation pier structures with DDBD method shows the structures are at the level of that exceed the limit structure stability which indicate that the structure stability has huge risk to collapse in an earthquake. In CSM Method, pillar structure is in Operational category which indicates that there was no structural and non-structure damage on piers when earthquake happened.Keyword : Earthquake, pier structure, Direct Displacement-Based Design, Capacity Spectrum Method, performance
Analisis Numerik Sistem Balok Bataton Semi Pracetak Dengan Variasi Jarak Dan Jumlah Tulangan Sengkang Prayogo Pratama; Ismeddiyanto Ismeddiyanto; Zulfikar Djauhari
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

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

Abstract

Semi precast concrete or Hybridconcrete construction (HCC) is a structure whose elements system is a combination of precast concrete and cast concretein place or castin place (CIP). Concrete type is in addition to flexural, stirrup reinforcement also need to develop strength. This study examines the behavior of bending and shear, load and deflection relationships, as well as variations in the amount of reinforcement stirrups. Based on the finite element-based numerical analysis, which examined Beams has dimensions of 290 x 140 mm with a length of 3000 mm. Quality precast used 5 MPa while cast in placenya 17.5 Mpa. Variations beam stirrups used without stirrups, stirrups spacing between 0.25 m and 0.15m. The beams are analyzed given the concentrated load at midspan. The analysis showed that the deflection of the beam without stirrups, beams with stirrups spacing between 0.25 m and 0.15 m respectively is 1.396 mm, 1.498 mm and 2.716 mm. Stiffness of the beam without stirrups, beams with stirrups spacing between 0.25 m and beams with stirrups spacing between 0.15 m respectively is 21.489 KN / mm, 21.36 KN / mm, 18.409 KN / mm. The bending moment beam without stirrups, beams with stirrups spacing between 0.25 a m and beams with stirrups spacing between 0.5 m succession is 22.5KNm, 24KNm, 37.5 KNM and third curvature beam models were analyzed in a row was 1.241 / mm, 1.332 / mm , 2.415 / mm.Keywords:Beam,finite element analysis software, semi-precast, stirrups reinforced.
Prediksi Respons Struktur Jembatan Beton Prategang Berdasarkan Spektrum Gempa Indonesia Dengan Metode Jaringan Saraf Tiruan Andi Wijaya; Reni Suryanita; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

The design of prestressed concrete bridge on high-risk seismic zones should consider the responses characteristic of the bridge structure. The structural responses such as displacement, velocity, and acceleration which are based on Indonesia’s Seismic Hazard Map, could be predicted by using Artificial Neural Network (ANN) method. In this research, the bridge model was adopted from the real prestressed concrete bridge located in Kecamatan Tapung, Kabupaten Kampar to analyze the bridge structural response and evaluate the potential of ANN to predict the results. The bridge structure was modeled in finite element software, then the response spectrum analysis was performed based on RSNI 2833-201X. For the seismic locations, 34 capital cities and 5 other big cities in Indonesia were chosen. Then by adding 3 soil conditions, 117 data sets were produced. Based on the analysis results, the largest structural response was observed in Palu City with 0,0738 m of displacement, 1,8406 m/sec of velocity, and 24,7666 m/sec2 of acceleration. For the ANN analysis, 102 data sets were used in training phase and the remaining 15 data sets were used in testing phase. After the training and testing process, the ANN model has the potency to predict bridge structural response at 93 to 97% of prediction rate and the calculated Mean-Squared Errors (MSE) is as low as 0,00019. This indicates that the ANN model adopted in this research is capable of predicting the structural response of bridge with high accuracy. Keywords: prestress concrete bridge, structural responses, Artificial Neural Network (ANN), response spectrum
Korosi Baja Tulangan Pada Beton OPC, PCC, Dan OPC POFA Di Lingkungan Air Garam Debby Mayangsari; Monita Olivia; 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

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

Abstract

This paper presents the results of an experimental investigation on the steel reinforcement corrosion and sorptivity. Concretes having three type of cements (OPC, PCC, and a mixtured of palm oil fuel ash). The effect of using blended cements on the resistance of concrete against damage caused bycorrosion of the embedded reinforcement has been investigated using an halfcell potential (ASTM C876). PCC concrete showed high resistance against damage by corrosion of the steel reinforcement.Keywords : palm oil fuel ash (POFA), half-cell potential, sorptivity, concrete
Kinerja Struktur Akibat Beban Gempa Dengan Metode Respon Spektrum Dan Time History (Studi Kasus : Hotel Ska Pekanbaru) Rezky Rendra; Alex Kurniawandy; Zulfikar Djauhari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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

Abstract

Earthquake is a natural disaster that is very difficult to predict, the occurrence is relatively short, but the impact can be very dangerous. Earthquake resistant building design must be implemented in the design of a building. dynamic analysis is necessary to determine structure behavior . In this study, there are two dynamic methods used, they are response spectrum method and time history method. Structures analyzed in this study were Hotel SKA Pekanbaru Building. This study examines the performance of the structure consist of story shear, displacement and story drift when receiving seismic load. spectrum response used is pekanbaru city spectrum response by SNI 1726-2012 while the time history used in this study is the time history of El-centro Earthquake, Mentawai Earthquake Aceh , Earthquake and Padang earthquake. response spectrum method Analysis produce Damage Control (DC) performance level in X direction and Y direction. time history of El-centro earthquake analysis produce Structural Stability (SS) performance level in X direction and Y direction. time history of Mentawai Earthquake analysis produce Immediate Occupancy (IO) performance level in X direction and Y direction. time history of Aceh Earthquake analysis produce Damage Control (DC) performance level in X direction and Y direction . time history of Padang Earthquake analysis produce Structural Stability (SS) performance level in X direction and Y direction.Keyword: Response Spectrum, Time History, Performance Level, Dynamic Analysis
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