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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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
Properties of Autogenous Shrinkage according to Hydration Heat Velocity of High Strength Concrete Considering Mass Member
Koo, Kyung-Mo ; Kim, Gyu-Yong ; Hong, Sung-Hyun ; Nam, Jeong-Soo ; Shin, Kyoung-Su ; Khil, Bae-Su ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 369~376
DOI : 10.5345/JKIBC.2012.12.4.369
In this study, to reduce the hydration heat velocity (HHV) of high-strength mass concrete at early ages, phase change materials (PCM) that could absorb hydration heat were applied, and the changes in autogenous shrinkage were investigated, as well as the relationship between the hydration temperature and autogenous shrinkage. The acceleration of the cement hydration process by the PCM leads to an early setting and a higher development of the compressive strength and elastic modulus of concrete at very early ages. The function of PCM could be worked below the original melting point due to the eutectic effect, while the hydration temperature and HHV of high-strength mass concrete can be decreased through the use of the PCM. A close relationship was found between the hydration temperature and autogenous shrinkage: the higher the HHV, the greater the ultimate autogenous shrinkage.
Evaluation of Impact Resistance of Steel Fiber and Organic Fiber Reinforced Concrete and Mortar
Kim, Gyu-Yong ; Hwang, Heon-Kyu ; Nam, Jeong-Soo ; Kim, Hong-Seop ; Park, Jong-Ho ; Kim, Jeong-Jin ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 377~385
DOI : 10.5345/JKIBC.2012.12.4.377
In this study, the Impact resistance of steel fiber and organic fiber reinforced concrete and mortar was evaluated and the improvement in toughness resulting from an increase in compressive strength and mixing fiber for impact resistance on performance was examined. The types of fiber were steel fiber, PP and PVA, and these were mixed in at 0.1, 0.5 and 1.0 vol.%, respectively. Impact resistance is evaluated with an apparatus for testing impact resistance performance by high-speed projectile crash by gas-pressure. For the experimental conditions, Specimen size was
, 30mm (
). Projectile diameter was 7 and 10 mm and impact speed is 350m/s. After impact test, destruction grade, penetration depth, spalling thickness and crater area were evaluated. Through this evaluation, it was found that as compressive strength is increased, penetration is suppressed. In addition, as the mixing ratio of fiber is increased, the spalling thickness and crater area are suppressed. Organic fibers have lower density than the steel fiber, and population number per unit area is bigger. As a result, the improvement of impact resistance is more significant thanks to dispersion and degraded attachment performance.
Relationship of Ceramic Insulation Panel System Development and Verification of LCC
Han, Min-Cheol ; Jeon, Kyu-Nam ; Lee, Gun-Cheol ; Kim, Tae-Hui ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 386~392
DOI : 10.5345/JKIBC.2012.12.4.386
In this study, life cycle cost (LCC) is analyzed according to insulation panel system type using a deterministic LCC analysis method. Through this analysis, it was found that the construction cost in the deterministic LCC analysis for Ceramic panels was low compared to the construction cost for metal and stone panels. Also, the difference in cost between the Ceramic panel and the metal panel was about 2 times. In the area of maintenance cost, it was found to be similar to the previously analyzed construction cost, in which the metal panel has the highest cost due to the high cost of construction and the frequent need for maintenance. In the case of the stone panel, a small difference in cost is shown compared with that of the Ceramic panel, but the cost is higher than the Ceramic panel. Regarding the cost of waste disposal, the Ceramic panel can reduce the cost by at least 1.5 times and up to 2 times compared to other panel systems. Finally, in the analysis of sensitivity according to changes in discount rates, the Ceramic panel and metal panel systems have a similar cost, and the cost of the metal panel is a bit larger than that of other panel systems. Thus, in the subjects used in the analysis, the Ceramic panel system shows the highest economic benefits.
An Experimental Study on the Carbonation and Drying Shrinkage of Concrete Using High Volumes of Ground Granulated Blast-furnace Slag
Ryu, Dong-Woo ; Kim, Woo-Jae ; Yang, Wan-Hee ; Park, Dong-Cheol ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 393~400
DOI : 10.5345/JKIBC.2012.12.4.393
The effect of ground granulated blast-furnace slag (GGBS) and alkaline activator on the properties of setting, compressive strength, drying shrinkage and resistance of carbonation was assessed to develop high volume slag concrete, the GGBS replacement rate of which was more than 80 percent. The changes in the concrete as the replacement rate of GGBS increases were as follows. Initial and final setting time was delayed by two and a half hours, and the compressive strength development properties of concrete in early and long term age were decreased. Drying shrinkage was satisfactory as below
in every mixture, and yet showed a tangible trend by replacement rate. Carbonation was materially increased. Setting time and early strength development property, however, were extremely advanced by the addition of the alkaline activator. While drying shrinkage was improved by the alkaline activator, resistance to carbonation was not.
Cost Analysis of the Structural Work of Green Frame
Joo, Jin-Kyu ; Kim, Sun-Kuk ; Lee, Goon-Jae ; Lim, Chae-Yeon ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 401~414
DOI : 10.5345/JKIBC.2012.12.4.401
The adoption of Green Frame is expected to provide economic benefits, since construction costs are reduced by the in-situ production of precast concrete column and beam. The cost reduction can ultimately be realized by saving transportation costs and the overhead and profit of PC plants. The cost structure of Green Frame, which is built up using composite precast concrete members, is similar to that of a bearing-wall structure, but the difference in construction process has resulted in some cost differences for a few items. In particular, production and installation is the principal work involved in Green Frame made by precast concrete members, while form and concrete work is the principal work for a bearing-wall structure. As such, the rental time and fee for a tower crane should be compared through time analysis. To verify reliability, this study focused on developed residential projects to estimate the construction costs. Through this analysis, it was found that the costs of Green Frame were 1.57% lower than the costs of bearing-wall structure. The results of this study will help in the development of a management plan for the structural work of Green Frame.
Comparative Analysis of Column Connection Characteristics of Green Frame
Kim, Keun-Ho ; Lee, Taick-Oun ; Lee, Sung-Ho ; Kim, Sun-Kuk ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 415~425
DOI : 10.5345/JKIBC.2012.12.4.415
Green Frame was developed to embody a Green structural system that can provide long life, resource reduction, and availability of remodeling in apartment buildings. Composite precast concrete column and beam, the major structural material of Green Frame, can be installed precisely and promptly through connection of steels and concrete. The connection of Green Frame can be divided into four types, based on the method and characteristics of connection. To select an appropriate type for the site, a comparative analysis of the four types is necessary. The objective of this study is to compare the duration, cost, quality, and safety of four types. The findings of this study can be applied during the selection that appropriate composite precast concrete column reflected project characteristics in design phase.
A Case Study on Engineering Education of Architectural Engineering CAD Using Blended Learning
Jang, Myung-Houn ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 426~432
DOI : 10.5345/JKIBC.2012.12.4.426
For students majoring in Architecture or Architectural Engineering, describing a building with pictures and signs is equal to expressing his/her opinion with sentences and presentations. CAD (computer aided design) is a method of describing buildings, and is used practically in architecture-related companies. Many universities prescribe CAD instruction as a compulsory subject, and ABEEK (Accreditation Board for Engineering Education of Korea) requires an introduction to CAD as a basic subject for visual expression. The Architectural Drawing and CAD class in the department of Architectural Engineering of J University is a 2-credit course, with 4 hours of lectures per week. Relative to other subjects, this is insufficient for practical study. Thus, to make up for this insufficient time, the class has adopted a Blended learning system that mixes off-line and on-line classes. The objective of this research is to introduce Blended learning, and to give a case study of the CAD class using Blended learning.
A Comparative Analysis of the Safety Awareness of Korean and Chinese Construction Workers
Zhang, Zhen ; An, Sung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 433~441
DOI : 10.5345/JKIBC.2012.12.4.433
Accompanied by Chinese strong economic growth rates and development of demand for the construction industry, Chinese construction industry has already become one of the largest construction markets in the world. Unfortunately, the frequent occurrence of safety incidents on Chinese construction sites is a large obstacle for other countries construction companies seeking to enter the Chinese construction market. This study aims to analyze and compare the safety awareness of Chinese and Korean construction workers. Our research showed that the safety awareness of Korean construction workers is far higher than that of their Chinese counterparts, particularly in terms of the efficiency of safety education and the observance of safety rules. The development of a safety management plan based on these results will contribute to reducing the frequency of accidents on Chinese construction sites.
Combined Effect of Fireproofing Gypsum Board on Residual Strength and Fire Resistance of Fiber Addition High Strength Concrete-Model Column
Yang, Seong-Hwan ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 442~450
DOI : 10.5345/JKIBC.2012.12.4.442
In this study, fire resistance and residual strength were examined after the addition of PF fiber and bonding fireproofing gypsum board to a high strength concrete-model column of 50 MPa grade. At the beginning of the experiment, all the properties of base concrete appeared to satisfy the target range. In terms of the internal temperature record, a trend of slightly high temperature was shown when the fireproofing gypsum board was not bonding, and when the fireproofing gypsum board was bonding, as PF content increased gradually, the temperature was gradually lowered. In terms of the relationship, as time elapsed a low temperature was shown when fiber was mixed, and when the board was bonding, the trend of lower temperature could be confirmed. Meanwhile, in terms of spalling property, a severe explosive fracture was generated at PF 0%, and falling off was prevented as the fiber content was increased; however, discoloration and a multitude of cracks were discovered, and when the board was bonding, the trend in which the exterior became satisfactory when the content was increased emerged. In terms of the residual compressive strength, measuring of strength could not be performed at PF 0% without bonding of board, and the strength was increased as the fiber content was increased; however, there was a decrease in strength of about 30 ~ 40%, and in the case of PF 0% with the bonding of board, the strength could be measured; however, about an 80% decrease in strength was shown, and only about a 10 ~ 20% decline in strength was displayed, as the range of decrease was reduced as the fiber content was increased. Considering all of these factors, it was determined that a more efficient enhancement of fire resistance was obtained when two methods are applied in combination rather than when the PF fiber content and bonding of fireproofing gypsum board are utilized individually.
Physical Properties of 50MPa and 80MPa Ternary High Strength Concretes before and after Concrete Pumping
Lee, Bum-Sik ; Kim, Seong-Deok ; Jun, Myoung-Hoon ; Park, Sung-Sik ; Park, Su-Hee ; Jung, Sang-Jin ;
Journal of the Korea Institute of Building Construction, volume 12, issue 4, 2012, Pages 451~459
DOI : 10.5345/JKIBC.2012.12.4.451
At the Korea Land and Housing Corporation(LH), concretes with high design strength of 50 MPa and 80 MPa that are composed only of ordinary Portland cement, blast furnace slag, and fly ash are developed. To determine whether the developed high strength concretes have the same properties when they are produced in batch plant(B/P) condition in the ready mixed concrete plant, and as existing high strength concretes, field tests are performed and material properties are evaluated. To investigate the material properties of the high strength concretes before and after pumping, compressive strength, flowability, air content, hydration temperature, pumping and compactability are evaluated. In field tests, before and after pumping, flowability satisfied the relevant criteria. In terms of air content, while it was slightly decreased after pumping, it satisfied the requirements. Hydration temperature criteria were satisfied, and compactability was excellent as well. The study found that the developed ternary high strength concretes have the same properties as existing high strength concretes. They can also be useful for the construction of high-rise buildings, as they are economical.