Members
fib Indonesia

Nama Instansi CV
Han Ay Lie UNDIP belum upload
Hadjar Seti Adji PT PP belum upload
Senot Sangadji UNS belum upload
Junaedi Utomo UAJY belum upload
Januarti J. Ekaputri ITS belum upload
Ilham Nurhuda UNDIP belum upload
Djwantoro Hardjito UK PETRA belum upload
Antonius UNISSULA belum upload
Stefanus Adi K. UNS belum upload
Harijanto Setiawan UAJY belum upload
Danis H. Sumadilaga PUPR belum upload
Iswandi Imran Fakultas Teknik Sipil dan Lingkungan ITB belum upload
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Leo S. Tedianto Teknik Sipil, Universitas Tarumanagara belum upload
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Hardi Wibowo Teknik Sipil Undip belum upload
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Chamzawi Pemkab. Purbalingga belum upload
Agung Sumarno Pusat Penelitan Biomaterial, Lembaga Ilmu Pengetahuan Indonesia (LIPI) belum upload
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Handoko Budi Nugroho PT Waskita Beton Precast, Tbk belum upload
Krisna Dwiyana S. PT. PATON BUANA SEMESTA belum upload
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Ir. Suryawan Murtiadi, M.Eng., Ph.D. Universitas Mataram belum upload
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Dr. Ir. A. R. Indra Tjahjani MT. Universitas Pancasila Jakarta belum upload
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Ari Widayanti Universitas Negeri Surabaya belum upload
Kiki Ruris Dawara ST Muhammadiah University of Malang belum upload
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M. Mirza Abdillah Pratama, S.T., M.T Universitas Negeri Malang belum upload
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Made Suangga Universitas Bina Nusantara belum upload
Edy Purwanto Universitas Sebelas Maret - Fakultas Teknik belum upload
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Purwanto FT. UNDIP belum upload
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Fajar S. Handayani Universitas Sebelas Maret belum upload
Ega Dhianty Institut Teknologi Sepuluh Nopember Surabaya belum upload
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Dr. Eng Hariyadi, ST, M.Sc Universitas Mataram belum upload
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member belum upload
Triwulan1, K A Priadana, J J Ekaputri and R Bayuaji Journal Article

Physical and Chemical Character of Fly Ash of Coal Fired Power Plant in Java

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Quality of fly ash is varying widely in the field, it depends on the combustion process and the quality of the basic ingredients, namely coal. It will affect the physical and mechanical properties of the concrete mixtures used. This study used 12 samples of fly ash. The physical and chemical properties and finesse modulus were analyzed. The fly ash was mixed with OPC (Ordinary Portland Cement) with the proportion of 20% fly ash and 80% OPC. The specimens were form with mortar dimension of 5cm x 5 cm. The test was affected by the correlation of fly ash fineness modulus to compressive strength, correlation density of fly ash to compressive strength, and correlation of carbon content to the compressive strength.
Subaer, Januari Jaya Ekaputri, Hamzah Fansuri and Mustafa Al Bakri Abdullah Conference

The Relationship between Vickers Microhardness and Compressive Strength of Functional Surface Geopolymers

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An experimental study to investigate the relationship between Vickers microhardness and compressive strength of geopolymers made from metakaolin has been conducted. Samples were prepared by using metakaolin activated with a sodium silicate solution at a different ratio of Si to Al and Na to Al and cured at 70oC for one hour. The resulting geopolymers were stored in an open air for 28 days before conducting any measurement. Bulk density and apparent porosity of the samples were measured by using Archimedes's method. Vickers microhardness measurements were performed on a polished surface of geopolymers with a load ranging from 0.3 – 1.0 kg. The topographic of indented samples were examined by using scanning electron microscopy (SEM). Compressive strength of the resulting geopolymers was measured on the cylindrical samples with a ratio of height to the diameter was 2:1. The results showed that the molar ratios of geopolymers compositions play important roles in the magnitude of bulk density, porosity, Vickers's microhardness as well as the compressive strength. The porosity reduced exponentially the magnitude of the strength of geopolymers. It was found that the relationship between Vickers microhardness and compressive strength was linear.
Antonius, Iswandi Imran and Prabowo Setiyawan Conference

On the Confined High-strength Concrete and Need of Future Research

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Investigation about requirements of confining reinforcement on the structure of high-strength concrete has been progressed significantly since the last three decades. Research carried out intensively on high-strength concrete, produces a material which has a relatively brittle nature. Various parameters of the confining reinforcement design have been varied to obtain the optimal results regarding the behavior of high-strength concrete, especially for columns comprehensively. This paper discussed about the development roadmap of confined high-strength concrete research, includes constitutive equations of confined high-strength concrete developed by researchers. In this paper modified of analytical model for confined normal to high-strength concrete is also proposed. Results of this further discussion were associated with the need of the development research of confining reinforcement on high-strength concrete material adapted to the material properties and zones in Indonesia.
Han Aylie, Antonius and Aldyan W. Okiyarta Conference

Experimental study of steel-fiber reinforced concrete beams with confinement

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This paper presents an experimental study to the effectiveness of steel-fiber concrete in combination with the confinement in the compression zone of a flexural member. A range of stirrup configurations functioning as confining elements, were evaluated. The study was aimed to analyze the effect of these confining reinforcement variations to the load carrying capacity and cracking moment of a simply supported beam loaded in pure bending. Additionally, steel-fibers were added to the concrete mix to improve the mechanical properties of the material. Five steel-fiber beams were evaluated, having a variation in confining reinforcement configurations. The variations in confining reinforcements were especially, but not exclusively, concentrated in the compression zone of the beam. To monitor the influence of the steel-fibers, a controlling element without the use of steel-fiber (conventional concrete) was also produced, and tested in the laboratory. The beam test set up was designed to undergo a state of pure bending by the use of a two-point loading system. The testing methodology under increasing monotonic loading was deformation controlled. The results showed that the variation in configuration of the confining reinforcement in the compression zone played an important role to the ultimate moment capacity of the beam. The experiments also demonstrated that the type of confinement has major impact to the cracking moment of the element. The addition of steel-fibers influenced the cracking moment positively.
Antonius Conference

Studies on the provisions of confining reinforcement for highstrength concrete column

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It is general knowledge that the design of earthquake-resistant structures for high-strength concrete columns requires confiningreinforcement with a relatively high volumetric ratio to ensure the ductility of the structure. This implies that the mechanical behavior of high-strength concrete differs significantly from the behavior of normal-strength concrete. However, the provisions on the minimum volumetric ratio of confining-reinforcement contained in the Indonesian Concrete Code (SNI 2847-2013) is essentially derived from the test results for normal-strength concrete. This paper studies the confining-reinforcement provisions used in several standards, i.e., SNI 2847-2013, ACI-2011, NZS-2006 and CSA-2004, to determine the ductility of the concrete columns. The case study is based on the analysis of the cross-section of high-strength concrete columns, the parameters that affect the strength, and by evaluating the value of the column’s cross-section curvature ductility. The study results showed that the equation for confining-reinforcement adopted in the SNI 2847-2013 is very conservative compared to other codes when applied to low axial load levels (≤0.2), but is relatively less conservative if the axial load level is greater than 0.3.
I DewaMade Alit Karyawan, ErvinaAhyudanari, Januarti Jaya Ekaputri Journal Article

Potential Use of Fly Ash Base-Geopolymer as Aggregate Substitution in Asphalt Concrete Mixtures

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Infrastructure industry is still dominant in developing countries. These activities requires a large number of aggregates. To make cement concrete and asphalt concrete, itrequires60% to 75% of aggregate in total volume of the mixture. This high volume of aggregates may cause reduction on availability of natural aggregate. Another problem is that not all area in Indonesia has the ability to provide adequate aggregates so that it can support the infrastructure development, especially in remote areas. The aggregate mobilization may face disruption. This research attempts to present an idea of creating an artificial aggregate. The artificial aggregate is made of power plant waste that is mixed with alkali silica, named as fly ash geopolymer. Previous study indicates that the use of fly ash geopolymer as filler replacement in asphalt concrete mixture, is able to double the stability of Marshall test. This experiment serves a role to design an artificial aggregate.
Junaedi Utomo, Muslinang Moestopo, Adang Surahman and Dyah Kusumastuti Conference

Applications of vertical steel pipe dampers for seismic response reduction of steel moment frames

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A newly developed vertical steel pipe damper is introduced to improve the seismic performance of steel moment frames. The damper exhibits large lateral stiffness and excellent capability to dissipate energy due to earthquakes. It provides a reliable, compact, inexpensive, and replaceable damper. Improved performance of the structure is verified analitically using a four-story steel moment frame equipped with steel pipe dampers. Vertical steel pipe dampers are placed between any two points where large relative motion exists during earthquake excitation. A nonlinear dynamic analysis of the structure using PERFORM-3D software demonstrated the significant benefit of equipping the structure with steel pipe dampers. All structural components, except the steel pipe dampers, remain elastic during earthquake excitation. Structures properly designed with vertical steel pipe dampers will only require minimum postearthquake inspection and limited damage. Some practical issues associated with the application of vertical steel pipe dampers to building structure for seismic response reduction are presented in this paper.
Muhammad Lutfi Manfaluthy and Januarti Jaya Ekaputri Conference

The Application of PVA Fiber to Improve the Mechanical Properties of Geopolymer Concrete

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This paper presents an experimental investigation on the improvement of geopolymer concrete properties through the use of polyvinyl alcohol (PVA) fibers mixed in the fresh concrete. For the purpose of obtaining the optimum mechanical properties, the volume fraction of PVA fibers was varied at 0% ; 0.3% ; 0.5% ; ad 0.8%. All mixtures were cast by mixing fly ash, alkali activator, and aggregates. The activator used in this study was a combination of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH). The mechanical properties of geopolymer concrete were obtained from the results of compressive strength, splitting strength, uniaxial tensile strength, elastic modulus, and flexural strength. It is found that the variation of 0.8% PVA fibers resulted in the highest strength for overall test. The utilization of 0.8% PVA fibers also contributed to increasing the direct tensile up to 50%. However, it is noticed that the elastic modulus was more prone to decrease as the fiber content in the mixture increased.
Kiki Dwi Wulandari and Januarti Jaya Ekaputri Conference

An Investigation of Damage Factors in Industrial Scale of Light-Weight Bricks Production

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A damage case of light weight brick’s production approximately at 6-7% of total production was found daily in one industry in East Jawa, Indonesia. The physical damage of product always occured. This paper investigates some factors that affect the lost in laboratory analysis. The analysis includes the chemical analysis of raw materials, reactivity of pozzolanic materials, and observation of strength based upon the position of light-weight bricks during autoclaving process. In addition, fly ash is introduced as mineral additive as one of the alternatives to improve the product’s quality. It is also concluded that grinding the silica sands particles is the optimum way to improve the quality, but the adding class F of fly ash to five percent in mixture is the most effective solution. Furthermore, maintaining quality of raw materials, curing process, and maintaining the machine will either reduce the product damage that occurred during the fabrication process in industry.
J J Ekaputri, M S Anam, Y Luan, C Fujiyama, N Chijiwa, D H E Setiamarga Journal Article

Application of GGBFS and Bentonite to Auto-Healing Cracks of Cement Paste

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Cracks are caused by many factors. Shrinkage and external loading are the most common reason. It becomes a problem when the ingression of aggressive and harmful substance penetrates to the concrete gap. This problem reduces the durability of the structures. It is well known that self – healing of cracks significantly improves the durability of the concrete structure. This paper presents self-healing cracks of cement paste containing bentonite associated with ground granulated blast furnace slag. The selfhealing properties were evaluated with four parameters: crack width on the surface, crack depth, tensile strength recovery, and flexural recovery. In combination with microscopic observation, a healing process over time is also performed. The results show that bentonite improves the healing properties, in terms of surface crack width and crack depth. On the other hand, GGBFS could also improve the healing process, in terms of crack depth, direst tensile recovery, and flexural stiffness recovery. Carbonation reaction is believed as the main mechanism, which contributes the self-healing process as well as the continuous hydration progress.
Adhitya Leonard Wijaya, Januarti Jaya Ekaputri and Triwulan Journal Article

Factors influencing strength and setting time of fly ash based-geopolymer paste

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In general, fly ash is often used as a binder in geopolymer mixture. In this paper, seven samples of fly ash were collected from five Indonesian power plants. The variation of fly ash may depend upon many factors. However, there is no standardization of fly ash used for geopolymer binder. This experiment was conducted to study and categorize fly ashes both by assessing their physical and chemical characters. All fly ashes were activated with alkali activator to prepare geopolymer paste. Ratio of fly ash to the alkali activator was kept constant at 65 : 35. Compression test was conducted at three, seven, 14, 21, 28, and 56 days to identify the strength development of each sample. The result revealed that the content of CaO in fly ash affected the setting time and early strength development. In three days paste with CaO content more than 20% gain 54% of its 28-day strength. It is caused by both hydration and polymerization reactions. A range of Si to Al ratio contributed to the strength.
Januarti Jaya Ekaputri, Subaer and Yulia Putri Wijaya Journal Article

Effect of Curing Temperature and Fiber on Metakaolin-based Geopolymer

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This paper presents mechanical properties of geopolymer mortar with metakaolin as a base material. Cylindrical specimens were prepared with a diameter of 5 cm and 10 cm height. Four compositions of geopolymer paste varied with adding polyvinyl alcohol fiber (PVA) from 0% to 1% by volume of paste. After casting, steam curing method was conducted at 40oC, 60oC and 80oC for 24 hours. A control specimen was cured at room temperature. Some tests were performed for setting time, compressive strength, split-tensile, direct-tensile and porosity. It showed that the strength of fibrous specimens was 67.29 MPa at of 56 days without steam curing. When curing temperature was risen from room temperature 80oC, the strength increased up to 14% at 28 days. Ratio of split to compressive strength was about 10% when 1% fiber was applied. However, an optimum result was shown by specimens containing 0.6% fibers according to direct-tensile test. It is recommended to apply steam curing at 60oC-80oC to increase the tensile strength.
Antonius and Iswandi Imran Journal Article

Experimental Study of Confined Low-, Medium- and High-Strength Concrete Subjected to Concentric Compression

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An experimental study of 23 low-, medium- and high-strength concrete columns is presented in this paper. Square-confined concrete columns without longitudinal reinforcement were designed, and tested under concentric axial compression. The columns were made of concrete with a compressive strength ranging between 30 MPa and 70 MPa. The test parameters in the study are concrete compressive strengths and confining steel properties, i.e. spacing, volumetric ratios and configurations. The effects of these parameters on the strength and ductility of square-confined concrete were evaluated. Of the specimens tested in this study, the columns made with higher-strength concrete produced less strength enhancement and ductility than those with lower-strength concrete. The steel configurations were found to have an important role in governing the strength and ductility of the confined high-strength concrete. Moreover, several models of strength enhancement for confined concrete available in the literature turned out to be quite accurate in predicting the experimental results.
Antonius Journal Article

STRENGTH AND ENERGY ABSORPTION OF HIGH-STRENGTH STEEL FIBER-CONCRETE CONFINED BY CIRCULAR HOOPS

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This paper presents the results of an experimental study of the behavior of high-strength steel fiber-concrete confined by hoops with round cross-sections subjected to concentric loadings. Behavior strength and energy absorption capability of confined fibrous concrete was the main focus of this study. Fibrous concrete test specimens were made by varying concrete’s compressive strength and characteristics of hoops reinforcement (i.e., volumetric ratio and spacing). All specimens used longitudinal reinforcement with the same ratio. Experimental results showed that the strength enhancement of confined concrete reinforced with steel fiber is strongly influenced by the characteristics of the installed confining reinforcement. In this paper, the confinement models by researchers were evaluated and compared with the experimental results. The comparison between existing confinement models and experimental results were significantly different, especially in the post-peak behavior. Obtaining accurate characteristic predictions of high-grade confined fibrous concrete is necessary prior to modification of existing confinement models.
J. Utomo, M. Moestopo, A. Surahman, D. Kusumastuti Journal Article

A Study on Simulation Models of Seismic Energy Absorbing Steel Pipes

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The aim of this study is to develop simulation models of steel pipe as hysteretic dampers for seismic resistant steel structures. Steel pipe dampers are chosen as energy dissipating device because they are easy to install, maintain and inexpensive. Steel pipes in various positions are able to dissipate seismic input energy in a structure through hysteresis of the metal. Numerical simulation is carried out using nonlinear structural analysis program ABAQUS. Cyclic shear loading is applied to: a) vertical steel pipe dampers positioned in the plane of the frame of the structure; and b) horizontal steel pipe dampers positioned perpendicular to the plane of the frame of the structure. Cyclic axial loading is applied to the horizontal steel pipes positioned in the plane of the frame of the structure; in this case the steel pipes are intended to function as stoppers to backup the main damper in absorbing excessive seismic input energy. The following requirements for steel pipe dampers are taken into account: a) dampers provide stiffness and supplement damping to the structure; b) most part of the dampers yield simultaneously; c) dampers have satisfactory ultra low-cycle fatigue (ULCF) capacity. Steel pipes with diameter greater than 100 mm (considered to be useable as dampers) have diameter to thickness ratio more than 20 which is too slender; meaning, steel pipes have less than necessary amount of material to fulfill the above requirements. Various strengthening strategies to bare steel pipes are explored in the simulation models. Ductile fracture in steel that initiates in fewer than twenty constant amplitude loading cycles has been term Ultra Low Fatigue Cycle. Under ULCFs load dampers experienced extensive plasticity and limited cyclicity. ULCF has been treated more as a fracture problem than a fatigue problem in micromechanics-based models, which provide accurate criteria for predicting ductile fracture, proposed by Kanvinde and Deierlein (2007). Ductile fracture controls the ultimate strength and ductility of structural components, therefore accurate preliminary prediction of ductile fracture is critical to the performance of steel pipe dampers. The finite element simulation models can be utilized to preliminary predict ductile fracture in steel pipes using the criteria from the micromechanics-based models. Several results from studying the behavior and preliminary ductile fracture prediction of the models, which show the potential to be developed further into operational hysteretic steel pipe dampers, will be presented.
J. Utomo, M. Moestopo, A. Surahman, D. Kusumastuti Conference

Estimating the ultimate energy dissipation capacity of steel pipe dampers

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In passive control systems, the energy input from earthquakes is delivered to special devices called seismic dampers. Passive energy dissipation systems are now recognized as an effective and inexpensive way to mitigate earthquake risks to structures. This paper presents two purposes. The first one is to elaborate a practical component integrity assessment using finite element ductile fracture simulation based on local approach. The second one is to estimate the ultimate energy dissipation capacity of steel pipe dampers using energy based damage model. Damper specimen tests are very important but expensive and time consuming therefore efficient tools are needed to minimize the expensive and time-consuming tests. Ductile fracture in steel components that happens in fewer than twenty constant amplitude loading cycles is known as Ultra Low Fatigue Cycle (ULCF). Under ULCFs load steel pipe dampers experienced extensive plasticity and limited cyclicity. Ductile fracture controls the ultimate strength and ductility of structural components, therefore accurate preliminary prediction of ductile fracture is critical to estimate the performance of steel pipe dampers. Steel pipe dampers absorb seismic energy input through hysteresis of the metal. The hysteretic behavior and ultimate energy dissipation capacity are investigated via finite element simulation after the component integrity assessment has been done. A micromechanics-based model which provide accurate criteria for predicting ductile fracture and an energy-based damage model to quantify the ultimate energy dissipation capacity of steel pipe dampers are applied. Using these approaches, ultimate energy dissipation capacity of steel pipe dampers can be estimated under various patterns of loadings. The approaches described here can also be applied to other steel dampers subjected to randomly applied flexural/shear stress reversals, such as those induced by earthquakes.
Junaedi Utomo Journal Article

Composite Columns in Low-to-Medium-Rise SCBFs with the Two-Story X-Configuration Braces

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Column demands of special concentrically braced frames (SCBFs) were investigated by Richards (2009). In low-rise SCBFs with braces in the two-story X-configuration, column demands were up to 100% greater than those commonly used in the design because of force redistribution that occurs after brace buckling. This approach is based on engineering judgement that is need to be questioned for the SCBFs with braces in the two-story X-configuration. The design of the columns should be done based on the maximum load that can be delivered by the braces. Composite columns, either encased of filled, can be an economical solution for the very high column demands. The concrete in the composite column can be added to carry additional loads without requiring an increase in the size of the steel section. The 2005 AISC Specification for Structural Steel Buildings provides the simple and practical methods to determine the capacity of composite columns. This specification allows composite columns to be designed with a minimum of 1% steel ratio, down from the 4% required in previous LRFD specifications. Very heavy columns would be the results of the design if bare steel columns instead of composite columns are employed. The design of composite columns using the 2005 AISC Specification will be discussed.
Junaedi Utomo Proceeding

Composite Column Force Transfer in Special Two-Story X-Braced Frames

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Reseach results have shown that columns in low-to-medium rise special two-story X-braced frames should be designed based on the capacity of the braces because of high column demands. Composite columns, either encased of filled, can be an economical solution to deal with the additional axial load capacity over that available with steel columns alone. Forces must be transferred between steel and concrete in composite columns so that dissimilar materials can achieve a state of equilibrium and act in a composite manner. With the new 2010 AISC Specification for Structural Steel Buildings, the provisions for force transfer have been greatly expanded in a new section to address the lack of clarity in previous Specification. The concept of load introduction length (AISC Specification I6.4) will be applied in the design the composite columns in low-to-medium rise special two-story X-braced frames with particular emphasis on the headed stud anchor provisions as they relate to load transfer. The clearer guidance in addressing component behaviour, design techniques, and proper detailing considerations in the 2010 AISC Specification will be followed.
Antonius, A. Widhianto, D. Darmayadi and Gata D. Asfari Journal Article

FIRE RESISTANCE OF NORMAL AND HIGH-STRENGTH CONCRETE WITH CONTAINS OF STEEL FIBRE

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This paper presents the behavior of steel fibre concrete post material burned under compression. Experimental program is carried out by making a concrete cylinder specimen in which the parameters being reviewed are the concrete compressive strength and the temperatures. The results of such experiments is that the degradation of steel fibre concrete compressive strength of the specimen average quality control on all concrete is about 10% to 20% when the specimen is burned at a temperature of 300
Antonius Journal Article

PERFORMANCE OF HIGH-STRENGTH CONCRETE COLUMNS CONFINED BY MEDIUM STRENGTH OF SPIRALS AND HOOPS

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This paper presents on an experimental study of confined high-strength concrete columns tested under axial compression. The main objective of the research is to know the performance of spirals and hoops with medium strength (400 MPa < fy < 600 MPa) in their contribution on the behaviour of confined high-strength concrete columns. The parameters of the study were concrete strengths, confining steel characteristics i.e: type of confinement (spirals and hoops), yield strength, spacing and volumetric ratio. From the experimental results it was found that the strength enhancement and ductility of confined concrete will decrease with if both of concrete strength and spacing of spirals or hoops increase, and the strain in the test also showed that the release of a cover of concrete core occurs prematurely. Other results shows that satisfactory of circular hoops as confinement steel behaved as good as the spiral reinforcement. The spiral reinforcement provision adopted in the Indonesian Concrete Standard 2002 (SNI 03-2847-2002) is quite reliable when applied in the design of confining steel with medium strength of high-strength concrete columns, therefore it is proposed that the upper limit provision of yield strength of confining steel warrant to be modified.
Annisa Rahmadina and Januarti Jaya Ekaputri Conference

Mechanical Properties of Geopolymer Concrete Exposed to Combustion

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This paper presents the change of material properties, such as decreasing of the compressive strength, splitting tensile strength, and porosity. The main objective of this paper is to analyze the mechanical properties of fly ash-based geopolymer concrete after being exposed to high temperature. The 28th-day test specimens were burned for one hour at specified temperature variation of 200
M M A B Abdullah, M FMTahir, M A F M A Tajudin, J J Ekaputri, R Bayuaji and N A M Khatim Conference

Study on The Geopolymer Concrete Properties Reinforced with Hooked Steel Fiber

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In this research, Class F fly ash and a mixture of alkaline activators and different amount of hooked steel fiber were used for preparing geopolymer concrete. In order to analyses the effect of hooked steel fiber on the geopolymer concrete, the analysis such as chemical composition of fly ash, workability of fresh geopolymer, water absorption, density, compressive strength of hardened geopolymer concrete have been carried out. Mixtures were prepared with fly ash to alkaline liquid ratio of 2.0 with hooked steel fibers were added to the mix with different amounts which are 1%, 3%, 5% and 7% by the weight of the concrete. Experimental results showed that the compressive strength of geopolymer concrete increases as the hooked steel fibers increases. The optimum compressive strength obtained was up to 87.83 MPa on the 14th day. The density of geopolymer concrete are in the range between 2466 kg/m3 to 2501 kg/m3. In addition, the workability value of geopolymer without hooked steel fibers is 100 mm while the workability value of geopolymer with hooked steel fibers are between 60 mm to 30 mm.
M M A B Abdullah, M FMTahir, M A F M A Tajudin, J J Ekaputri, R Bayuaji, and N AMKhatim Conference

Study on The Geopolymer Concrete Properties Reinforced with Hooked Steel Fiber

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In this research, Class F fly ash and a mixture of alkaline activators and different amount of hooked steel fiber were used for preparing geopolymer concrete. In order to analyses the effect of hooked steel fiber on the geopolymer concrete, the analysis such as chemical composition of fly ash, workability of fresh geopolymer, water absorption, density, compressive strength of hardened geopolymer concrete have been carried out. Mixtures were prepared with fly ash to alkaline liquid ratio of 2.0 with hooked steel fibers were added to the mix with different amounts which are 1%, 3%, 5% and 7% by the weight of the concrete. Experimental results showed that the compressive strength of geopolymer concrete increases as the hooked steel fibers increases. The optimum compressive strength obtained was up to 87.83 MPa on the 14th day. The density of geopolymer concrete are in the range between 2466 kg/m3 to 2501 kg/m3. In addition, the workability value of geopolymer without hooked steel fibers is 100 mm while the workability value of geopolymer with hooked steel fibers are between 60 mm to 30 mm.
Aiman Mahmad Nor, Zarina Yahya , Mohd Mustafa Al Bakri Abdullah , Rafiza Abdul Razak , Januarti Jaya Ekaputri, M. A. Faris , and Hazamaah Nur Hamzah Conference

A Review on the Manufacturing of Lightweight Aggregates Using Industrial By-Product

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The waste materials from industrial are one of the concern issues in sustainable development. Recycle and reduce the waste material is one of the strategies to produce the better sustainable system. One of the methods is by using the waste materials to produce artificial aggregate. There are wide applications of artificial aggregate, for instance construction, agriculture, geotechnical fill, waste water, drainage and many more. Physical properties such as bulk density, specific gravity, unit weight, porosity and water absorption are important criteria. The performance of the artificial aggregate varies, depending on the application.
Utomo, J*., Moestopo, M., Surahman, A., and Kusumastuti, D Journal Article

Applications of vertical steel pipe dampers for seismic response reduction to steel moment frames

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A newly developed vertical steel pipe damper is introduced to improve the seismic performance of steel frames. The damper exhibits large lateral stiffness and excellent capability to dissipate energy due to earthquakes. It provides a reliable, compact, inexpensive, and replaceable damper. Improved performance of the structure is verified analitically using a four-story steel moment frame equipped with steel pipe dampers. Vertical steel pipe dampers are placed between any two points where large relative motion exists during earthquake excitation. A nonlinear dynamic analysis of the structure using PERFORM-3D software demonstrated the significant benefit of equipping the structure with steel pipe dampers. All structural components, except the steel pipe dampers, remain elastic during earthquake excitation. Structures properly designed with vertical steel pipe dampers will only require minimum post-earthquake inspection and limited damage. Some practical issues associated with the application of vertical steel pipe dampers to building structure for seismic response reduction are presented in this paper.
Januarti Jaya Ekaputri, Inne Syabrina Mutiara, Siti Nurminarsih, Nguyen Van Chanh, Koichi Maekawa and Davin H. E. Setiamarga Conference

The effect of steam curing on chloride penetration in geopolymer concrete

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In this paper, we present the result of our study on the effect of steam curing to chloride ion penetration in geopolymer concrete. Class F fly ash was activated using sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). The concrete specimens were then steam-cured at 40
Evrianti Syntia Dewi and Januarti Jaya Ekaputri Proceeding

The Influence of Plain Bar on Bond Strength of Geopolymer Concrete

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This paper presents some results of experimental study of bond strength of plain bar embedded in geopolymer concrete. Fly ash class F was used as a raw material activated with alkali solutions. The combination of 8 Molar of sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) as alkali activators was examined in the mixture with ratio of 2.5 by weight. Nine cubical specimens with a size of 150 x 150 x 150 mm were prepared to measure bond strength and slip between reinforcement and concrete. The influential factors studied for the experimental investigation were the diameter of reinforcement bar, bond area, and concrete cover to diameter (c/d) of reinforcement. The result showed that the average bond strength decreased as the diameter of plain bar and bonded length were increased from 16 mm to 19 mm. However, the 12 mm showed the different result allegedly caused by the effect of bond area and the passive confined provided by the concrete. Based on several equations used to compare the bond strength, it is clear that deformed bar of 12 mm in diameter is potential to increase the bond strength.
Wiwik Dwi Pratiwi, Hamzah Fansuri, Januarti Jaya Ekaputri and Triwulan Conference

Effect of Activators on Strength of Hybrid Alkaline Cement

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Hybrid alkaline cement is a class of alkaline cement resulted from alkali activation of the medium calcium content of aluminosilicate materials. This paper presents an experimental analysis of alkali activators effect on strength of hybrid alkaline cement produced from 80% fly ash and 20% ordinary Portland cement. Two alkali activators were observed i.e. 5% sodium sulfate and a combination of 5% of sodium sulfate-1.1 M SiO2 of sodium silicate solution. Compressive strength tests were performed on 20mmx 40mm cylinder paste specimens while setting time tests were conducted by Vicat needle. Scanning electron microscopy analysis and measurement of fly ash reaction degree were performed to explain the compressive strength of paste. It is concluded that addition of soluble silicate on the dry mix of hybrid cement-sodium sulfate activator reduce compressive strength and shorten the setting time. Both of activators give relative low fly ash reaction degree.
Puput Risdanareni, Januarti Jaya Ekaputri and Triwulan Proceeding

The Effect of Sintering Temperature on The Properties of Metakaolin Artificial Lightweight Aggregate

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This paper describes the effect of sintering temperature on the properties of metakaolin artificial lightweight aggregate (ALWA). Three types of sintering temperature applied in this research are 900
Kefiyalew Zerfu and Januarti Jaya Ekaputri Proceeding

An Approximate Deflection Function for Simply Supported Quadrilateral Thin Plate by Variational Approach

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This paper presents more convenient deflection function that properly substitutes slow converging series function by Naiver for simply supported quadrilateral thin plate. The formulation of the deflection function was conducted by using variational approach. During formulation, Rayleigh-Ritz procedures was used and coordinate function that satisfies kinematic boundary condition and the minimum potential energy principle was developed. In addition to coordinate function, modification factor was applied to the main function for curve fitting purpose. To validate the current study, comparisons were done with Navier
Poppy Puspitasari, Andoko Andoko , Heru Suryanto , Puput Risdanareni , Januarti Jaya Ekaputri Conference

Properties of Mn0.4Zn0.6Fe2O4 and Mn0.6Zn0.4Fe2O4 as Nanocatalyst for Ammonia Production

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Ammonia synthesis requires high pressure and high temperature process. Unfortunately, the capital intensive cost resulting low yield of ammonia by using recent catalyst which is iron oxide. Therefore, manganese zinc ferrite as a soft ferrite material will be introduced as a new nanocatalyst to enhance the ammonia yield. As a new nanocatalyst for ammonia production, study of comparasion two different concentration of MnZn Ferrite is very important. This paper will compare the yield of ammonia by using two different nanocatalyst which are Mn0.4Zn0.6Fe2O4 and Mn0.6Zn0.4Fe2O4. Both were synthesized by sol-gel method and has been characterize by using FESEM (morphology), XRD (phase identification), EDX (elemental analysis) and TPR (oxide reduction). The ammonia was produce with and without magnetic field applied. The result shows that the ammonia yield is higher for Mn0.4Zn0.6Fe2O4 nanocatalyst than Mn0.6Zn0.4Fe2O4 by using magnetic field applied. 67.2% of yield has been achieved by using new nanocatalyst Mn0.6Zn0.4Fe2O4 and magnetic field applied at ambient environment.
Puput Risdanareni, Poppy Puspitasari, Ekaputri Januarti Jaya Conference

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

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Research on finding suitable cement substitute material becomes massive due to environmental effect. Geopolymer as inorganic material is potential to be the smart solution to overcome global warming issue. Fly ash is a waste material rich in silica and alumina becomes popular raw material to produce geopolymer. The best properties ofgeopolymer paste come from the high quality of fly ash. Therefore, it is important to investigate various types of fly ash and geopolymer properties. Their chemical and physical properties characterized by XRF, pH value, XRD and SEM. The results showed that type of fly ash depended on amount of Si-based of Ca-based compound which consisted of spherical morphology. Geopolymer paste produced from the ash with different compound has bulky and irregular shape morphology. The pH value of each ash has also a correlation with the setting time of fresh paste.
Yonathan Raymond A, Ekaputri Januarti Jaya , and Triwulan Conference

Optimizing High Performance Self Compacting Concrete

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This paper
Ridho Bayuaji, Sigit Darmawan , Nur Ahmad Husin , Boedi Wibowo , Srie Subekti , Januarti Jaya Ekaputri1 , Mohd Mustafa Al Bakri Abdullah , and Totok Ruki Biyanto Conference

The Effect of High Temperature on Compression Strength of Geopolymer Paste

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This research has a purpose to confirm the resistance of geopolymer concrete towards high temperature. This high temperature becomes the issues in material structure defense due to the danger of fire. Therefore, this research is done on geopolymer paste, the main binding ingredient from fly ash as local industry waste material. The method that is used in order to achieve the objective is done experimentally in laboratory with the geopolymer testing paste constructed of type C fly ash. Fly ash was obtained from PT. Petrokimia Gresik. The activator alkali sodium hydroxide (NaOH) was designed 6, 10, and 14 Molar. The dimension of specimen shape was cylinder 2.5 cm
Triwulan, Januarti Jaya Ekaputri and Nur Fadlilah Priyanka Conference

The Effect of Temperature Curing on Geopolymer Concrete

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This study presents curing temperature influences to behaviors of geopolymer concrete. The concrete was fly ash based, with the ratio of fly ash to alkaline activator was 65%:35%. Ratio coarse aggregate to fine aggregate was 60%:40%, ratios Na2SiO3/NaOH were 1.5:2 and 2.5. A polycarboxilate superplasticizer with ratio was 2% to fly ash weight. Form of the test specimens were cylinder with diameter of 10 cm and 20 cm high. Steam curing conducted were at 40C, 60C and 80C for 24 hours. The control specimens were treated at normal moist curing. Tests conducted were compressive strength, tensile strength, porosity and elasticity modulus. The results indicated that at the elevated temperature the compressive strength increases as well as tensile strength but decreases the closed porosity of specimens. The elasticity modulus had a similar tendency.
Like Novia Halim, Januarti Jaya Ekaputri and Triwulan Conference

The Influence of Salt Water on Chloride Penetration in Geopolymer Concrete

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This paper presents the influence of chloride ion penetration in geopolymer concrete. Fly ash as based material for geopolymer concrete was used in this mixture. Fly ash was mixed with sodium hydroxide (NaOH) 8 M and sodium silicate (Na2SiO3) as the alkali solution. The sizes of cylindrical specimens were prepared with a diameter of 100 mm and 200 mm high. Some specimens were immersed in salt water at a concentration of 3.5%, and other control specimens were cured in tap water for 30, 60, 90, and 120 days. The mechanical properties were determined with compressive test which was conducted at 28, 30, 60, 90 and 120 days. Some durability tests were performed for porosity, chloride penetration, and pH measurement. It was found that geopolymer concrete has higher compressive strength than concrete made with Ordinary Portland cement (OPC). However, chloride penetration in geopolymer concrete is higher than OPC. The pH measurement showed that geopolymer concrete has less pH than OPC concrete. The porosity of concrete has been found to influence chloride penetration and pH of concrete.

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