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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
Editor in Chief :
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
Development of a Cash Flow Forecasting Model for Housing Construction
Jang, Joo-Hwan ; Kim, Ju-Hyung ; Jee, Nam-Yong ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 257~265
DOI : 10.5345/JKIBC.2012.12.3.257
Many construction companies are simultaneously carrying out numerous projects in the housing construction industry. It is essential to accurately forecast the cash flow of a project through optimal process management and resource input in order to manage funds rationally and enhance the competitiveness of a company. Current cash flow forecasting methods offer lower accuracy due to a large gap between the revenue and expenditure element. Expenditure elements depends on the real-time changing actual cost for work performed. This research survey was conducted on the actual state of construction management of K company to investigate the problems of cash flow forecasting. To achieve this, the work process and construction management system were integrated to improve the cost management system of K company. To accurately forecast the cash flow of a project, revenue and expenditure elements were displayed in the total cash flow forecast window. This research is expected to assist in the implementation of a system of cash flow forecasting on housing construction by excluding negative elements of revenue and expenditure.
Modelling the Estimation Process of Greenhouse Gas Emission in the Construction of Buildings
Yi, Kyoo-Jin ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 266~274
DOI : 10.5345/JKIBC.2012.12.3.266
The annual expenditure on diesel oil and heavy oil in the construction sector is the second largest among all industrial sectors. To meet the government's greenhouse gas reduction targets, the construction sector has until 2020 to cut its emissions by 7.1%. Unlike other high-tech industrial sectors, the construction sector has a fairly limited scope for technological improvements, which hampers its capacity to achieve the reduction target. To reduce emissions, it is necessary to establish an energy and emissions strategy at the project planning stage, and energy use and the resulting emissions must be estimated. This research aims to establish an estimation methodology for greenhouse gas emissions at the planning stage of construction projects. To estimate the project-related emissions, this research indentified the relationship among the types of emissions in a cross-sectional matrix form, and then provided a set of calculation methods for total project related emissions.
Corrosion-Inhibition and Durability of Polymer-Modified Mortars Using Redispersible Polymer Powder with Nitrite-Type Hydrocalumite
Kim, Wan-Ki ; Hong, Sun-Hee ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 275~283
DOI : 10.5345/JKIBC.2012.12.3.275
Nitrite-type hydrocalumite (calumite) is a material that can adsorb the chloride ions (
)that cause the corrosion of reinforcing bars and liberate the nitrite ions (
) that inhibit corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. In this study, VA/E/MMA-modified mortars with calumite were prepared with various calumite contents and polymer binder-ratios, and tested for corrosion inhibition, chloride ion penetration, carbonation and drying shrinkage. As a result, regardless of polymer-binder ratio, the replacement of ordinary Portland cement with hydrocalumite has a marked effect on the corrosion inhibiting property of the polymer-modified mortars. However, chloride ion penetration and carbonation depths are somewhat increased with higher calumite content, but can be remarkably decreased depending on the polymer-binder ratios. The 28-d drying shrinkage shows a tendency to increase with the polymer-binder ratio and calumite content. VA/E/MMA-Modified mortars with 10 % calumite did not satisfy KS requirements. Accordingly, a calumite content of 5 % is recommended for the VA/E/MMA-modified mortars with calumite.
Effects of Cement Fineness Modulus (CFM) on the Fundamental Properties of Concrete
Noh, Sang-Kyun ; Han, Cheon-Goo ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 284~290
DOI : 10.5345/JKIBC.2012.12.3.284
Cement Fineness Modulus (CFM) is a method of expressing the distribution of particle sizes of cement in numeric form. If CFM is controlled through crush process of cement without modifying the chemical components or mineral composition of cement, it is judged to be able to produce a cement satisfying various requirements because it is estimated to enable various approaches to cement such as high early strength, moderate heat, low heat cement and so on. Therefore, in this study, as basic research for manufacturing special cement utilizing the controls of CFM, the intention was to review the impacts of CFM on the fundamental properties of concrete. To summarize the result, as mixture characteristics of fresh concrete, ratio of small aggregate and unit quantity were gradually increased, securing greater fluidity, with an increase in CFM, while the amount of AE and SP were reduced gradually. In addition, setting time was delayed as CFM increased. Furthermore, compression strength was relatively high during initial aging as CFM became smaller, but as time passed, compression strength became smaller, and it showed the same level of strength as aging time passed about three years.
Development of Efficient Curing Sheet for Thermal Insulation Curing of Concrete in Cold Weather
Han, Cheon-Goo ; Son, Myung-Sik ; Choi, Hyun-Kyu ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 291~298
DOI : 10.5345/JKIBC.2012.12.3.291
For cold weather concreting, frost damage at early age is generated in the concrete, and problems such as delaying of setting and hardening and lowering of strength manifestation emerge due to the low outside air temperature at the early stage of pouring, making the selection of an effective curing method critically important. Unfortunately, the tent sheet currently used as the curing film for heating insulation at work sites, not only has the problems of inferior permeability and extremely deteriorated airtightness, but a phenomenon of continuous fracturing is also generated along the direction of fabric of the material itself, presenting difficult circumstances for maintaining adequate curing temperature. The aim of this study was to develop an improved bubble sheet type curing film for heating insulation of cold weather concrete by combining mesh-tarpaulin, which has excellent tension properties, with bubble sheet, which offers superior insulation performance. The analysis showed that the improved curing film in which BBS1 is stacked to MT was a suitable replacement for curing films currently in use, as it has better permeability, tension property, and insulation performance than the T type film used at work sites today.
Collaborative Process to Facilitate BIM-based Clash Detection Tasks for Enhancing Constructability
Seo, Jung-Ho ; Lee, Baek-Rae ; Kim, Ju-Hyung ; Kim, Jae-Jun ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 299~314
DOI : 10.5345/JKIBC.2012.12.3.299
One of reasons for introducing Building Information Modeling (BIM) is to support clash detection tasks by means of a 3D product model. In the conventional construction project process, clashes have been found during construction phase. However, it can cause cost overrun and time delay. In order to investigate and correct clash detections at design phase, relevant business process and guide for this task should be provided. This study aims to identify hindrances in clash detection tasks at the design phase and analyze its current process using IDEF0 model. Despite the convenience of IDEF0 as a systems analysis tool, professional participants might have difficulties to understand their own tasks according to business process. For this reason, in this research, Business Process Model and Notation (BPMN) is introduced to provide ideal process and required decision making governance. The provide BPMN model will provide insights for a BIM-based collaborative environment to enhance the constructability through the construction project.
An Experimental Study on the Freezing-Thawing and Chloride Resistance of Concrete Using High Volumes of GGBS
Ryu, Dong-Woo ; Kim, Woo-Jae ; Yang, Wan-Hee ; You, Jo-Hyung ; Ko, Jeong-Won ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 315~322
DOI : 10.5345/JKIBC.2012.12.3.315
The effect of ground granulated blast-furnace slag(GGBS) and alkali activator compressive strength, resistance of chloride attack and freezing-thawing is assessed to develop high volume slag concrete, the replacement rate of GGBS of which is more than 80 percent. result, as the replacement rate of GGBS increases, the compressive strength development properties of concrete in early and long term age decreased and resistance chloride attack and freezing-thawing is increased. The early strength development property, however, is extremely advanced by addition of the alkali activator, which is also found to improve resistance chloride attack and freezing-thawing.
An Experimental Study on the Mechanical Properties of Concrete with High Temperatures and Cooling Conditions
Kim, Gyu-Yong ; Kang, Yeoun-Woo ; Lee, Tae-Gyu ; Choe, Gyeong-Cheol ; Yoon, Min-Ho ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 323~331
DOI : 10.5345/JKIBC.2012.12.3.323
Since the 1970s, the mechanical properties of concrete at high temperature, such as compressive strength, elastic modulus, thermal strain, etc. have been investigated. Internal and external factors should be effect to concrete elevated temperature. In particular, the thermal properties of aggregate and cooling conditions are most important to estimate residual mechanical properties. This study evaluates the mechanical properties of concrete with aggregate type and cooling methods. We use normal and light aggregate for different thermal properties, and also test mechanical properties to use
mm cylinder specimen according to target temperature, slow cooling and water cooling. We found that normal aggregate concrete that uses is more highly influenced by cooling conditions than concrete that uses light aggregate concrete. In addition, the residual mechanical properties of concrete increase as cooling velocity lowers.
Flow and Engineering Properties of Fiber Reinforced Hwangtoh Mortars
Mun, Ju-Hyun ; Yang, Keun-Hyeok ; Hwang, Hye-Zoo ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 332~339
DOI : 10.5345/JKIBC.2012.12.3.332
In this study, six mortar mixes were tested in order to examine the significance and limitations of hydrophilic fiber in terms of its capacity to enhance the tensile resistance of Hwangtoh mortar. Lyocell, polyamide and polyvinyl alcohol (PVA) fibers were selected for the main test parameters. The tensile capacity of mortars tested was evaluated based on the splitting tensile strength and the modulus of fracture, while their ductility was examined using the toughness indices specified in ASTM. Test results showed that the addition of lyocell and PVA fibers had little influence on the flow of the Hwangtoh mortars. To enhance the tensile capacity and toughness index of Hwangtoh mortar, it is proposed that fiber spacing above 0.0003 is required, regardless of the type of fiber.
A Basic Model of the Procurement Planning of Resources by Activity in Construction Projects
Kim, Ji-Hyun ; Nam, Gi-Yung ; Lee, Soo-Yong ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 340~346
DOI : 10.5345/JKIBC.2012.12.3.340
Recently, the construction industry has been pursuing the rationalization of its various systems through informatization. Procurement is a highly important element of the construction process, as it is directly related to the cost and quality of a construction project. In addition, procurement management of resources is in an indivisible relation, so that it is significant to link each other effectively. This study proposed construction activity and basic data connected to cost summary work for the categorization and utilization of resources. This study connected that activity to detailed items of material and labor cost, and proposed a procurement planning model of resources by activity that can utilize all resources and information. In addition, this model can classify resources and information by various forms. We found that the utilization of this procurement planning model will be higher because it can grasp various problems that occur in the passive procurement and provide additional functions that can be modified.
Case Study of Concrete Surface Design and Construction Method for Freeform Building Based on BIM -Focused on Tri-Bowl, Korea-
Ryu, Han-Guk ; Kim, Sung-Jin ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 347~357
DOI : 10.5345/JKIBC.2012.12.3.347
While it is generally possible to install curved panels manufactured in a factory within the permitted error range on an irregular surface frame of concrete or steel, it is difficult and expensive. Freeform architecture is thus designed and constructed differently from formal buildings. In order to more easily and inexpensively actualize freeform architecture, Building Information Modeling (hereinafter referred to as BIM) has recently been applied in the construction industry. However, the related research and case analyses are not sufficient to identify the implications and contributions of freeform buildings in future similar projects. Therefore, this research will study design and construction methods for freeform surfaces, particular the concrete surface frame of freeform buildings based on BIM, focused on the Tri-Bowl project. This study attempts to analyze the pros and cons of each method for the concrete surface frame of the Tri-Bowl, and then presents the lessons learned and implications related to the design and construction process of the freeform architecture. Several implications for design and construction of concrete surface frame of the freeform building, the Tri-Bowl, are found. The first is that manufacturing and installation of a curved concrete frame is precisely performed based on the exact numerical values of materials and installation made using BIM 3D technologies, such as CATIA and Rhino. The second is that close and continuous collaboration among the different participants in the construction of the Tri-Bowl allowed them to cope with virtual conditions. The third is that design and construction processes have changed, and high quality of the surface frame of a freeform building is required.
Automatic Arrangement Algorithm for Tower Cranes Used in High-rise Apartment Buildings
Lim, Chae-Yeon ; Kim, Sun-Kuk ; Seo, Deok-Seok ; Son, Ki-Young ;
Journal of the Korea Institute of Building Construction, volume 12, issue 3, 2012, Pages 358~368
DOI : 10.5345/JKIBC.2012.12.3.358
On most construction sites, the arrangement of tower cranes is decided by site engineers based on their own experience, which can cause cost overruns and delays in the lifting work. Although many researchers have conducted studies on tower crane arrangement using computer modeling and knowledge-based expert systems as well as mathematical models, no research has aimed to develop an algorithm to identify an optimum solution among several alternatives for installation areas of tower cranes satisfying the conditions of lifting work. The objective of this study is to develop an automatic arrangement algorithm for tower cranes used in high-rise apartment construction. First, as a new concept, a possible installation area of tower cranes was suggested. Second, after proposing several alternatives based on the installation points suggested in this study, an algorithm analyzing the economic feasibility of tower cranes was developed considering the rental, installation and removal costs. Third, a case study was conducted to prove the validity of the developed algorithm for selecting and installing an effective set of tower cranes at minimum cost.