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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 11, Issue 6 - Dec 2011
Volume 11, Issue 5 - Oct 2011
Volume 11, Issue 4 - Aug 2011
Volume 11, Issue 3 - Jun 2011
Volume 11, Issue 2 - Apr 2011
Volume 11, Issue 1 - Feb 2011
Selecting the target year
The Strengthening Effects of Concrete Columns Confined with Carbon Fiber Sheets along the Fiber Direction
Kim, Yang-Jung ; Hong, Gap-Pyo ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 326~332
DOI : 10.5345/JKIBC.2011.11.4.326
Carbon, Aramid, Boron and Glass fibers are used as fibrous materials to promote structural bearing strength. Of these fiber types, carbon fiber is the most commonly used material, and is characterized by having a one-way direction, which is strengthened by tensile strength due to the attached direction only, while other types of fibers are two-way. Therefore, when applied in the field, the attachment direction of fiber is a very important factor. However, when fiber direction is not mentioned in the design drawing, there sometimes is no improvement in structural strength, as the fiber is being installed by a site engineer or workers who lack structural knowledge. The purpose of this study was to propose an optimal direction of carbon fiber through a comparison & analysis of reinforcing efficiency with reinforced experimental columns that used carbon fibers in each of the inclined, horizontal and vertical directions. According to the results, horizontal direction in the reinforced column was improved by 153.43%, but vertical direction was 104.61% only, and it was understood this was due to increased tensile strength along the fiber direction. For this reason, it is necessary to include information regarding fiber direction in design and site management.
An Analysis of the Mechanism of Crack Stop-bar for Floor Plastering of Apartment Buildings
Song, Yong-Sik ; Lee, Dong-Hoon ; Lee, Sung-Ho ; Kim, Sun-Kuk ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 333~344
DOI : 10.5345/JKIBC.2011.11.4.333
The recent expansion in the number of housing construction projects has been accompanied by substantial improvements in construction quality, which can be attributed to the development of new construction technologies and materials. In apartment complex construction projects, numerous mechanization technologies have been adopted as part of the floor plastering process to counter increasing difficulties in securing labor and the pressing need to reduce lead time, but these have also triggered setbacks such as additional costs or loss of time to fix cracks in or loosening of floor. Cracks developing in the floor of an apartment housing unit, in terms of materials in use, are the products of a complex combination of material makeup, construction workmanship, concrete curing and the protection method. Controlling such elements from the perspective of materials in use may ensure partial success in reducing cracks, but fall short of eliminating them completely. Any attempt to prevent cracks from developing in the first place requires systematic analysis as to their potential causes and viable solutions to reduce them. On this backdrop, this paper aims to provide an analysis of potential causes of cracks found in floor plastering, and consider the mechanism of a crack stop-bar as a fundamental safeguard against them.
An Experimental Study on Alkali-Silica Reaction of Alkali-Activated Ground Granulated Blast Furnace Slag Mortars
Kim, Young-Soo ; Moon, Dong-Il ; Lee, Dong-Woon ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 345~352
DOI : 10.5345/JKIBC.2011.11.4.345
The purpose of this study was to investigate the expansion of alkali-activated mortar based on ground granulated blast furnace slag containing reactive aggregate due to alkali-silica reaction. In addition, this study was particularly concerned with the behavior of these alkaline materials in the presence of reactive aggregates. The experimental program included expansion measurement of the mortar bar specimens, as well as the determination of the morphology and composition of the alkali-silica reaction products by using scanning electron microscopy(SEM), and energy dispersive x-ray(EDX). The experiment showed that while alkali-activated ground granulated blast furnace slag mortars showed expansion due to the alkali-silica reaction, the expansion was 0.1% at Curing Day 14, showing that it is safe. After the accelerated test, SEM and BEM analysis showed the presence of alkali-silica gel and rim around the aggregate and cement paste. According to the EDX, the reaction products decreased markedly as alkali-activated ground granulated blast furnace slag was used. In addition, for the substitutive materials of mineral admixture, a further study on improving the quality of alkali-activated ground granulated blast furnace slag is needed to assure of the durability properties of concrete.
Evaluation on Spalling Properties of Specimen Size with PP Fiber and Fireproof Coating
Kim, Gyu-Yong ; Min, Choong-Siek ; Lee, Tae-Gyu ; Miyauchi, Hiroyuki ; Park, Gyu-Yeon ; Lee, Gwang-Jun ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 353~362
DOI : 10.5345/JKIBC.2011.11.4.353
High Strength Concrete (HSC) has weakness that in a fire, it is spalled and brittles. The phenomenon of spalling is made by water vapor's being confined in watertight concrete. This study is aimed to evaluate explosive spalling properties of high strength concrete with
mm specimen and
mm column. To prevent spalling of concrete, fireproof coating and PP fiber are used. As a result,
mm column was prevented spalling likes
mm specimen. When concrete protected failure to explosive spalling, quantity heat ratio (which fireproof coating specimen to pp fiber mixed specimen) between
mm was maximum value at 20 minute, but difference of quantity heat ratio decreased and quantity heat ratio of each specimen is almost same at 30 minute.
Fundamental Physical Properties of Cement Composites Containing Fineness Reject Ash
Lee, Kang-Pil ; Hong, Man-Gi ; Lee, Sang-Soo ; Song, Ha-Young ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 363~370
DOI : 10.5345/JKIBC.2011.11.4.363
This study considerated reject ash, wastes of coal-fired power plants, to use mineral admixtures for cement. The pozzolan activity selected the fineness of the efficient reject ash through comparison and it compared to the fly ash that are widely used for concrete mixed material. Cement composites was prepared replacing of slag cement by fineness reject ash and fly ash, and properties of cement composites was tested by paste(setting time, fluidity, instrumental analysis) and mortar(compressive strength). Instrumental analysis results showed hydration reaction of fineness reject ash was not different from fly ash, but had more dense micro structures. Results of physical properties showed fineness reject ash shorten setting time, increased compressive strength compared by fly ash. Therefore using fineness reject ash with
/g to concrete mineral admixtures or cement composites was might be possible and could contribute to improve properties of concrete.
Development of Testing and Analysis Model for Evaluation of Absorbed Water Diffusion into Concrete
Park, Dong-Cheon ; Ahn, Jae-Cheol ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 371~378
DOI : 10.5345/JKIBC.2011.11.4.371
Concrete is affected by various deterioration factors, such as
and chloride ions from the sea, which cause carbonation and salt attack on concrete. These deterioration phenomena cause steel corrosion in RC structures. Although a great deal of research has been carried out in this area thus far, it is difficult to know the point at which corrosion will occur to a reinforced bar. As the diffusion of deterioration factors depends on the water content in concrete, it is imperative to assess the condition of absorbed water content. A mass measuring method was applied to calculate the absorbed water diffusion coefficient, as well as non-linear finite element method(FEM) analysis. As a result, it was found that W/C and unit water content in concrete mixture affect the diffusion coefficient decision.
Evaluation of Fiber and Blast Furnace Slag Concrete Chloride Penetration through Computer Simulation
Kim, Dong-Hun ; Petia, Staneva ; Lim, Nam-Gi ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 379~386
DOI : 10.5345/JKIBC.2011.11.4.379
Durability of concrete is an important issue, and one of the most critical aspects affecting durability is chloride diffusivity. Factors such as water.cement ratio, degree of hydration, volume of the aggregates and their particle size distribution have a significant effect on chloride diffusivity in concrete. The use of polypropylene fibers(particularly very fine and well dispersed micro fibers) or mineral additives has been shown to cause a reduction in concrete's permeability. The main objective of this study is to evaluate the manner in which the inclusion of fiber(in terms of volume and size) and blast furnace slag(BFS) (in terms of volume replacement of cement) influence the chloride diffusivity in concrete by applying 3D computer modeling for the composite structure and performing a simulation of the chloride penetration. The modeled parameters, i.e. chloride diffusivity in concrete, are compared to the experimental data obtained in a parallel chloride migration test experiment with the same concrete mixtures. A good agreement of the same order is found between multi.scale microstructure model, and through this chloride diffusivity in concrete was predicted with results similar to those experimentally measured.
Evaluation of Pumping Characteristics of High Strength Concrete using Continuous Pumping System
Kwon, Dae-Hun ; Lee, Han-Seung ; Jeon, Jun-Young ; Jeong, Woong-Taek ; Jo, Ho-Kyoo ; Kim, Hyung-Rae ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 387~395
DOI : 10.5345/JKIBC.2011.11.4.387
In the construction of tall-building, concrete pumping influences the success of the project. In order to establish pumping technology for high speed construction of tall building, study for quantitative evaluation of flow characteristics and pumpability should be conducted. So in this study, the characteristics including the inner pipe pressure, rheological properties of concrete and mortar through the continuous pumping test were evaluated. Then we analyzed the relations between rheological properties and pumpability. In the result of test, there are high correlations between the rheological characteristics which represented by yield stress and plastic viscosity and pressure loss with pipe length. Also, we estimated pressure loss according to conditions of concrete mix and pumping through the evaluation of inner pipe friction.
An Enhanced TACT Technique for Finish Work of High-rise Residential Buildings
Kim, Sun-Kuk ; Son, Ki-Young ; Joo, Jin-Kyu ; Lee, Dong-Hoon ; Lee, Sung-Ho ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 396~406
DOI : 10.5345/JKIBC.2011.11.4.396
Execution of the finish work for high-rise residential construction occurs when a mixture of work progresses simultaneously at each floor or sector and is carried on by highly-specialized subcontractor teams. Therefore, the finish work plan requires an effective scheduling method that interfaces between the work and the teams. In order to address these issues, the TACT technique is utilized in Korea. This technique is based on Line-of-Balance and Lean construction. However, according to recent case studies, finish work using TACT technique was frequently delayed with cost overruns because the work was performed without a detailed schedule control plan outlining the relationship between architecture and mechanical, electrical, and plumbing work. This paper describes the enhanced-TACT technique which provides a detailed work flow chart and TACT work template. With improved TACT technique, this paper will contribute to improved cash flow and reduced cycle time and provide quality improvement through work continuity.
Revitalization Methods of EIFS for High-rise Residential Buildings through Using TACT and Gangform System with Hanging Scaffolding
Lee, Sang-Hyun ; Yi, June-Seong ; Shin, Seung-Woo ; Kang, Hae-Min ;
Journal of the Korea Institute of Building Construction, volume 11, issue 4, 2011, Pages 407~418
DOI : 10.5345/JKIBC.2011.11.4.407
Recently energy management measures at the political level, for the purpose of reducing energy consumption in the building sector, are being actively introduced. As a practical method, the exterior insulation method, which is proven to effective in reducing the energy loss through walls, has been favored. In this study, detailed implementations are suggested to activate exterior insulation system which can improve the housing insulation performance. The newly designed Gang-form system with hanging scaffolding was suggested to revamp constructability for finishing outer wall. The research results are based on a multifaceted analysis of the current problems of exterior insulation systems, and on recommendations proposed by exterior insulation experts in the Charrette discussion. The study has indicates that the customized TACT schedule considering the site condition has shortened the construction period to 5 months from 7.5 months. Through utilizing the suggestions of this study, the prevalence of exterior insulation systems is expected to become widespread.