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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Building Construction
Journal Basic Information
Journal DOI :
The Korean Institute of Building Construction
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Volume & Issues
Volume 12, Issue 6 - Dec 2012
Volume 12, Issue 5 - Oct 2012
Volume 12, Issue 4 - Aug 2012
Volume 12, Issue 3 - Jun 2012
Volume 12, Issue 2 - Apr 2012
Volume 12, Issue 1 - Feb 2012
Selecting the target year
Maintenance Model of Agricultural Facilities Using CBR
Kim, Jae-Yeob ; Lee, Yong-Kyu ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 133~141
DOI : 10.5345/JKIBC.2012.12.2.133
As we move from the industrial age to the information age, domestic industries are changing rapidly, and rural society is also laying the foundation to make use of information technologies. Through this kind of modernization, the size of agricultural facilities has been increasing on a significant scale. But, in reality, there are many difficulties in the maintenance of agricultural facilities in proportion to their growing number. Accordingly, this research aims to solve the fundamental problems that occur with agricultural facilities in the maintenance stage. In addition, it aims to provide information on how to maintain and manage facilities for farmers. The presentation of the maintenance information was conducted using a case-based reasoning method that solves current problems based on past cases. The tool of case-based reasoning was applied to define the establishment of the base for cases, characteristic variables and maintenance measures. The effectiveness of a CBR model was examined through the case study. The use of the case-based reasoning method is judged to be effective as a tool to support the decisions of farmers regarding maintenance. When the maintenance measures derived through the CBR model are offered to farmers, the fundamental problems of maintaining agricultural facilities will be solved, and the damage to such facilities minimized.
Performance Criteria to Assess the Remodeling Feasibility of Office Buildings
Yang, Keek-Young ; Yoon, Yer-Wan ; Jeong, Dong-Whan ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 142~151
DOI : 10.5345/JKIBC.2012.12.2.142
Despite the changes to demands and perceptions according to building deterioration, most of the previous studies on remodeling have focused on apartment buildings, which are residential buildings. Few studies have been conducted on buildings for general commercial use, or office buildings. Accordingly, this study set out to prepare a set of performance criteria to assess the remodeling feasibility of office buildings. For that purpose, 23 assessment items were devised, their importance was tested, 13 were extracted, and a set of scoring criteria for each item was prepared. Case analysis was conducted to check the reliability of the assessment items and scoring criteria. Through this analysis, it was found that the criteria were reliable.
Evaluation of the Basic Properties of Materials for Application of Functional Plaster Mortar
Cho, Do-Young ; Kim, Gyu-Yong ; Miyauchi, Hiroyuki ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 152~160
DOI : 10.5345/JKIBC.2012.12.2.152
The development of building must be accompanied with construction technology and performance of materials. In particular, wet processes have a high level of dependence on manpower and a low level of diversification of materials used. This study aimed to determine the applicability of various materials for wet process, mechanized construction and eco-friendly building materials through a comparison with dry premixed mortar. As a result, it was found that resin plaster and gypsum plaster`s strength is lower than that of dry cement mortar, but their mechanization application, construction simplification, smoothness and bond strength are higher than that of dry cement mortar. And estimate that is valid as workability, bonding strength, eco-friendly building material in occasion of gypsum plaster.
Effect of Recycled Aggregates Powder on the Properties of Zero Cement Mortar Using the Recycled Fine Aggregates and Fly-Ash
Park, Kyung-Taek ; Son, Seok-Heon ; Han, Cheon-Goo ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 161~168
DOI : 10.5345/JKIBC.2012.12.2.161
The purpose of this study was to investigate the influence of recycled aggregates powder (RP) contents on recycled aggregates (RA) using fly-ash (FA) mortar in a condition of zero cement targeting earth filling materials, and the results can be summarized as follows. First, there was a tendency that as RP contents increased, W/B and air contents increased also. In the case of compressive strength, the strength was hardly developed at the early age, which was prior to 14 days; however, with the starting point of 14 days of age, strength of around 1.5~2.0 MPa was developed when it arrived at 28 days. At a curing temperature of
, the more RP contents increased, the more the compressive strength increased in comparison with FA 100% at all levels except RP 100 %, showing the highest compressive strength at RP 25 %. At a curing temperature of
, the temperature-dependence appeared to be large, as the RP contents were decreased compared to the curing temperature of
. In addition, based on SEM analysis, this study was able to confirm that a pozzolanic reaction formed by an alkali stimulus of RA with the lapse of certain days even in 100 percent FA, causing the densification of tissues, and with RP 25%, hydrate was created the most densely by the hydration of unhydrated cement particles and pozzolanic reaction of FA.
Profit-oriented Impact Analysis of Demand Management Strategy on Design-Build Firms Using System Dynamics
Yoo, Wi-Sung ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 169~182
DOI : 10.5345/JKIBC.2012.12.2.169
In the past, a strategic management of work demands has been increasingly challenged to design-build (DB) firms. Such a management is capable of providing sufficient profitable impact of a project on them. Total project profit is mainly related to actual resources, work completion time, amount of rework, and costs. The degree of recycling work packages in the DB project delivery system is used as a measure of the quality of the performed work. However, there are few models available to evaluate the impact of a demand management strategy on the DB firms and to predict its behavior. We propose a decision-making support model as an aid for assessing the amount of rework and for predicting project profit resulting in a convincible demand management strategy. This model is constructed by using a dynamic feedback approach that can analyze the problems arising in complex managerial systems. For the purpose of illustration, widely acceptable strategies were applied into the model to explore their impacts on the DB firms. The results indicate that the model is helpful for the managers in selecting the most appropriate demand management strategy for successfully achieving their objectives.
Compressive Properties of Amorphous Metal Fiber Reinforced Concrete Exposed to high Temperature
Lee, Jun-Cheol ; Kim, Wha-Jung ; Lee, Chang-Joon ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 183~193
DOI : 10.5345/JKIBC.2012.12.2.183
Compressive property of high strength concrete with amorphous metal fibers subject to high temperature has been investigated. The measure of this investigation includes explosive spalling, weight loss, residual compressive strength, strain at peak stress, elastic modulus, and residual energy absorption capacity after exposure to
. In addition to the amorphous metal fiber, two other types of fibers (polypropylene fiber and hooked-end steel fiber) were also included in this investigation for comparison. The experimental program was conducted with high strength concrete using several combinations of the fiber types. The testing result shows that the concrete with amorphous metal fibers plus polypropylene fibers shows a superior behavior than those using other combination or single fiber type ingredient.
Cementing Efficiency of Fly-ash in Mortar Matrix According to Binder-Water Ratio and Fly-ash Replacement Ratio
Cho, Hong-Bum ; Jee, Nam-Yong ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 194~202
DOI : 10.5345/JKIBC.2012.12.2.194
This paper predicts the cementing efficiency of fly-ash(FA) based on mortar test considering binder-water ratio and FA replacement ratio as experimental variables. The cementing efficiency prediction model proposed by statistical analysis enables us to estimate the value according to the binder-water ratio and FA replacement ratio of matrix. When FA replacement ratio is the same, the lower the binder-water ratio, the higher the estimated cementing efficiency. There are significant differences in the values according to binder-water ratio at FA replacement ratios of 15% or less, but there are almost no differences when FA replacement ratio is more than 15%. As the binder-water ratio increases, the variations in the values according to FA replacement ratio are great at FA replacement ratios of 15% or less. As the FA replacement ratios increase, the values increase for FA replacement ratios of 15% or less, but decrease for more than 15%. The values range from -0.71 to 1.24 at binder-water ratio of 1.67-2.86 and FA replacement ratio of 0-70%. The RMSE of the 28-day compressive strength predicted by modified water-cement ratio is 2.2 MPa. The values can be trusted, as there is good agreement between predicted strength and experimental strength.
Properties of Hydration Heat of High-Strength Concrete and Reduction Strategy for Heat Production
Jaung, Jae-Dong ; Cho, Hyun-Dae ; Park, Seung-Wan ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 203~210
DOI : 10.5345/JKIBC.2012.12.2.203
Recently, the interest and demand for large-scale buildings and skyscrapers have been on the rise, and the performance of concrete is an area of high priority. Securing `mass concrete and high strength concrete` is very important as a key construction technology. For high strength concrete, the high heat of hydration takes place inside the concrete because of the vitality of hydration in cement due to the large amount of powder, and leads to problems such as an increase of thermal stress due to the temperature difference with the outside, which results in cracks and slump loss. For this reason, measures to solve these problems are needed. This study aims to reduce the hydration heat of high strength concrete to control the hydration heat of mass concrete and high strength concrete, by replacing the type of admixture, The purpose of this study is to control the hydration heat of high strength concrete and mass concrete. Our idea for this purpose is to apply not only the types and contents of admixture but also incorporation mixing water to ice-flake. As a result of the test, the use of blast furnace slag and fly ash as admixture, and the use of ice-flake as mixing water can improve the liquidity of concrete and reduce slump loss. Significantly dropping the maximum temperature will contribute greatly to reducing cracks due to hydration heat in mass concrete and high strength concrete, and improve quality.
Investigation on Level of Emergency Treatment Performance on Building Construction Sites in Jeju
Kang, Soon-Min ; Jang, Myung-Houn ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 211~219
DOI : 10.5345/JKIBC.2012.12.2.211
On January 27, 2005, the central government of the Republic of Korea designated Jeju Island as an Island of World Peace based on Article 12 of the Special Act for the Jeju Free International City, and the WHO designated Safe Community Jeju in July, 2007. Whenever an industrial accident occurs on Jeju Island, reports in the media raise the question of whether Jeju is a safe city or not. But due to the characteristics of construction sites in Jeju, it is very difficult to employ workers of a certain level. For the safety of workers, it is also thought that owners should make a decisive investment to introduce an education and reward system in order to improve the consciousness level of workers. This research focuses on first-aid on construction sites. It then surveys the level of construction safety management, and suggests improvements in construction safety control and first-aid.
Conceptual design development of Guide Rail for Cleaning Robot in Curtain Wall Facade of Skyscraper
Kim, Chang-Han ; Han, Jae-Goo ; Kim, Kyoon-Tai ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 220~229
DOI : 10.5345/JKIBC.2012.12.2.220
In recent years, the number of high-rise buildings has been on the rise. As buildings have become larger in scale, significantly different issues related to their construction and maintenance have emerged. In addition, the automation and mechanization of the cleaning work for the curtain wall, one of the most frequently-performed tasks in building maintenance, is required as a fundamental measure. For this reason, a guide-rail cleaning robot system is emerging as one of the measures in response to external factors, including gust. Therefore, this is a preliminary study for the automation and mechanization of the curtain wall cleaning of high-rise buildings, and aims to derive the basic units and prepare for the concept of the guide rail. It is expected to serve as precedent research for the development and operation of a curtain-wall cleaning robot, and to prepare the basis for an final design of optimal guide rail.
Development and Structural Assessment of Joints of Permanent Uni-Wall System and Floor Systems in Substructure
Chun, Sung-Chul ; Kim, Seung-Hun ; Noh, Sam-Young ; Kim, Kap-Soo ; Han, Byum-Seok ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 230~242
DOI : 10.5345/JKIBC.2012.12.2.230
Recently the Permanent Uni-wall System (PUS) has been developed which improved the disadvantage of the Cast-In-Place Concrete Pile (CIP) and could be used as permanent retaining wall. In this study, joints between PUS and floor systems were developed. From analyses of the characteristics of design and construction of PUS, shear friction reinforcements with couplers were adopted for shear design of the joints. Twelve types of joints were developed which were classified according to the types of floor structures, wale, and piles of PUS. Two typical joints were tested and the joints showed satisfactory behaviors on the points of shear strength, stiffness, and serviceability. Especially the shear strengths were much higher than the design strengths due to the shear keys which were by-products in splicing shear reinforcements. However, the shear strength of the joint is recommended to be designed by only shear friction reinforcement because shear key is not reliable and too brittle.
An Experimental Study on the Evaluation of Fastening Unit Insulation Developed for the Insulation of Curtain Wall
Kim, Bong-Joo ; Kim, Kyeong-A ;
Journal of the Korea Institute of Building Construction, volume 12, issue 2, 2012, Pages 243~256
DOI : 10.5345/JKIBC.2012.12.2.243
This study is the experimental study to improve the insulation of the fastening unit system, which has the most vulnerable insulation in the curtain walls. The Fastening Units were designed and fabricated to minimize the connection part of mullions. In addition, slight movements were taken into account and the performance of the middle layer was evaluated by forming an insulation layer with the vibration-proof rubber and the silicon to satisfy the mechanical and thermal performance criteria. A total of 10 experiments were performed under various conditions, such as indoor-outdoor temperature difference, type of insulation material, thickness of insulation material, and others. using the fabricated Fastening Units. As a result, the vibration-proof rubber insulation showed the temperature difference of
, and the silicon insulation showed the temperature difference of
, compared to the non-insulated Fasteniirature difference, typesng Units. When these results were compared with the psychometric chart graph, the insulated Fastening Unit designed in this study can be considered to prevent the dew condensation.