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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 8, Issue 6 - Dec 2008
Volume 8, Issue 5 - Oct 2008
Volume 8, Issue 4 - Aug 2008
Volume 8, Issue 3 - Jun 2008
Volume 8, Issue 2 - Apr 2008
Volume 8, Issue 1 - Feb 2008
Selecting the target year
금호아시아나 신사옥 리모델링 및 신축공사
Lee, Jae-Won ; Im, In-Sik ; Hwang, Gyu-Pyo ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 7~15
DOI : 10.5345/JKIC.2008.8.5.007
A Study on the Structural Characteristic of Recycled Aggregate Concrete Reinforced Steel Fiber
Kim, Jeong-Sup ; Shin, Yong-Seok ; Park, Young-Bai ; Kim, Jeong-Hoon ; Cho, Chang-Ho ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 35~42
DOI : 10.5345/JKIC.2008.8.5.035
In this study, a sample was fabricated according to the recycled aggregate replacement level(0%, 30%, 60%), and the steel fiber mixing status in order to use recycled aggregate as a concrete alternative coarse aggregate, and then the materials and structural characteristics of recycled aggregate and steel fiber which impacted the reinforced concrete were analyzed. A conclusion was derived as follows. After considering the results of various material experiments and mock-up test, when a flexural strength and a ductility factor is increased and the replacement level is increased through mixing the steel fiber with the recycled aggregate concrete, the ductility and flexural strength reduction seems to be inhibited by adding the steel fiber. Also, it is indicated that the recycled aggregate has almost-similar compressive strength, tensile strength flexural strength and ductility capacity to the concrete which using the general gone even though the steel fiber is used and the replacement level is increased to 30%. Accordingly, the reinforced concrete frame using the steel fiber mixture and recycled aggregate seems to apply to the actual structure.
A Study on the Shear Strengthening Effect of Reinforced Concrete Beams with Structural Damage
Shin, Yong-Seok ; Kim, Jeong-Hoon ; Kim, Jeong-Sup ; Kim, Kwang-Seok ; Cho, Cheol-Hee ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 43~51
DOI : 10.5345/JKIC.2008.8.5.043
This study examines shear capacity performance and structural characteristics of reinforced concrete beam using carbon fiber sheet(CFS), g)ass fiber sheet(GFS), glass fiber steel plate(GSP) and carbon fiber bar CB) which are reinforcing materials for reinforced concrete beam in order to produce similar condition to repair and reinforce actual structure and aims to provide data available In designing and constructing reinforced concrete structures under the structural damage. This study obtains the following conclusions. After considering the shear experiment results. it was indicated that the CB reinforced test object was the best in the shear capacity improvement and ductility capacity as it was contained in the concrete and was all operated, Also, GFS reinforced test object indicated the reduced flexural capacity but good shear capacity. GSP reinforced test object had bigger reinforcing strength than other reinforcing test objects. On the other hand, it showed the lowest reinforcement effect as compared section thickness of reinforced material because it showed the bigger relativity a section thickness of reinforced material. If the adherence to the concrete is improved, it will seem to show bigger reinforcement effect.
Strength Properties of the Fiber Mixed High Strength Concrete at Elevated Temperature
Kim, Sang-Shik ; Kim, Seong-Soo ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 53~58
DOI : 10.5345/JKIC.2008.8.5.053
This study is to investigate experimentally residual strength properties of the high strength concrete containing the hybrid of nylon and polypropylene fiber at elevated temperature. Test results showed that specimens heated up to
exhibited similar strength properties to the one at room temperature. This result is significantly different from previous studies. but specimens heated over
showed dramatic decrease indicating similar tendency. For the residual strength properties, one at
even increased 10%, which is also different from previous studies, but it significantly decreased in
as widely expected. Melted pores by organic fibers in concrete specimens was observed with FE-SEM. For the density of concrete in elevated temperature, internal system in
had even denser than in
, but was collapsed in
Fundamental Study on Evaluation method of Activity Factor of Fly Ash
Park, Sang-Joon ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 59~65
DOI : 10.5345/JKIC.2008.8.5.059
In the evaluation method of KS on the activity factor of fly ash, same amount of cement should be replaced with fly ash. Therefore, contradictory effects on concrete strength exist, i. e. strength decease due to low content of cement and strength increase of strength due to filling-pore-function of fly ash. European Committee for Standardization (CEN) specifies the method 1 to 4. adding fly ash without reducing the content of cement, for the evaluation method on activity factor of fly ash. This study investigates the applicability of the method 2 of CEN to mix design of concrete. The followings are derived ; There is a key ratio of f)y ash mixing which enhances the incremental ratio of mixing water to improve fluidity of mortar. The incremental ratio of mixing water is maximized about 11% ratio of fly ash mixing. Compressive strength most slightly increases at that ratio of fly ash mixing. Activity factor of fly ash increases as water-cement ratio becomes low and contents of fly ash becomes high. Moreover, quality of fly ash and condition of mix design affect the applicable amount of fly ash and available range of water-cement ratio. However, this method has some problems for practical purpose because activity factors of fly ash for some cases are over 1.0. Further research should be conducted to develop more useful method of evaluating activity factor of fly ash.
A Study on the Human Resource Management of the Specialty Contractors Performing Multi Projects -Focused on Rebar and Concrete Work-
Seo, Jong-Min ; Na, Young-Ju ; Kim, Sun-Kuk ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 67~73
DOI : 10.5345/JKIC.2008.8.5.067
Recent trends in construction towards larger scale and taller buildings are causing problems by ineffective existing management approach in construction industry have emerged. Delivering necessary materials and mobilizing the human resources and equipment In a timely manner to keep labor on schedule have become a critical issue to be addressed. In particular, many specialty contractors carrying out multiple projects have been experiencing difficulties mobilizing the manpower on time and in right places due to poor communication at each stage of labor supply, resulting in waste of valuable resources. Hence, it`s imperative for the specialty contractors to obtain specific information on labor demand so as to set up a communication and labor management system to ensure the right human resources will be mobilized in the right place at the right time. The study therefore is aimed at developing an optimal human resources management system for specialty contractors performing multiple projects. To that end, the study is focused on rebar and concrete work. The outcome of the study is expected to help allocate the right human resources to the right place in a timely fashion, thereby achieving an effective workflow at construction sites.
A Study of Client`s Role for Safety Management at Construction Sites
Lim, Jee-Young ; Han, Kap-Kyu ; Kim, Sun-Kuk ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 75~83
DOI : 10.5345/JKIC.2008.8.5.075
Larger and more sophisticated building construction requires more input resources such as worker, materials and devices. Growing resource volume brings risks at a construction site. The industry makes an effort to protect probable incidents at the site by organizing a safety management team. conducting a safety instruction and etc, but losses especially in the construction are higher than other industries. Major reason is that the safety management program is conducted only at the step of construction work and a root cause is not eliminated. Conventionally a concerned party shifts the blame to other parties such as constructor and site workers who are direct participants in the construction site. However, the whole causes of incidents go to the all subject of the construction not only the constructor but the client, designer and others related in the construction, and especially the clients are heavily involved in general concerns of the project. Therefore, this study is defined the role of the clients in nations and domestic condition of construction safety management is investigated. And it is analyzed surveys to prevent incidents at construction sites, and suggested the role of the clients which is classified pre and post construction, and in the middle of construction, and also categorized planning and design & construction schedule especially for the pre-construction level.
Mix Design of Polymer Grouting Mortar for Prepacked Concrete Using Polymer Dispersions
Jo, Young-Kug ; Kim, Wan-Ki ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 85~91
DOI : 10.5345/JKIC.2008.8.5.085
Prepacked concrete has recently been used in the special constructions fields such as underwater concrete work, heavy-weight concrete work, underground structure work, partial repair works for damaged reinforced concrete structures. and polymer-modified mortars have been employed as grouting mortars for the prepacked concrete. The purpose of this study is to recommend the optimum mix design of polymer-modified grouting mortars for prepacked concrete. Polymer-modified mortars using SBR and EVA emulsions as admixture of grouting mortars for prepacked concrete are prepared with various mix proportions such as sand-binder ratio, fly ash replacement ratio, polymer-binder ratio. and tested for flowability, viscosity of grouting mortars, bleeding ratio, expansion ratio, flexural and compressive strengths of grouting mortars and compressive and tensile strengths of prepacked concretes. From the test results, it is apparent that polymer-modified mortars can be produced as grouting mortars when proper mix design is chosen. We can design the mix proportions of high strength mortars for prepacked concrete according to the control of mix design factors such as type of polymer, polymer-binder ratio, sand-binder ratio and fly ash replacement ratio. Water-binder ratio of plain mortars for a constant flowability value are in the ranges of 43% to 50%. SBR-modified mortar has a little water-binder ratios compared to those of plain mortar, however, EVA-modified mortar needs a high water-binder ratio due to a high viscosity of polymer dispersion. The expansion and bleeding ratios of grouting mortars are also controlled in the proper value ranges. Polymer-modified grouting mortars have good flexural. compressive and tensile strengths, are not affected with various properties with increasing fly ash replacement to cement and binder-sand ratio. In this study, SBR-modified grouting mortar with a polymer-binder ratio of 10% or less, a fly ash replacement of 10% to cement and a sand-binder ratio of 1.5 is recommended as a grouting mortar for prepacked concrete.
The Effect on the Granodiorite Suspension Coated Indoor Finishing Materials for Reduction of TVOC Emissions
Lee, Jong-Gyu ; Kim, Ji-Hyun ; Lee, Jae-Yong ; Lee, Soo-Yong ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 93~99
DOI : 10.5345/JKIC.2008.8.5.093
The environment draws attention in the global community and a growing number of Koreans have interest in improving the quality of life, the importance of house environment has attracted the attention of the public. Against this backdrop, constructors have unveiled environmentally -friendly projects. However, they failed to establish people-oriented environment by being occupied with maximizing profitability through the improvement of brand image and caused sick house syndrome that has recently made controversy. In this regard, the study analyzed the mechanism of discharge of TVOC, one of the sick house syndrome-causing materials, that affects IAQ and its characteristics and examined the effect that granodiorite has on reduction of the discharge of TVOC in order to minimize damage. Experimental sample consisted of interior finishing materials frequently used in ceiling, wall and floor and adhesives used at a time of construction, and the TVOC of building materials was measured through the use of septum bottle unlike In the existing chamber method. Measures to counter the sick house syndrome were suggested by reducing the possible damage from the stage of selection of building material and by figuring out the effect that the granodiorite has on reduction of the discharge of TVOC.
Fire Resistance of the Concrete Corresponding to the Various Fiber Contents and Heating Curves
Han, Cheon-Goo ; Pei, Chang-Chun ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 101~107
DOI : 10.5345/JKIC.2008.8.5.101
This study investigated fundamental characters of the concrete according to various fiber types and contents and their properties of spatting resistance and residual compressive strength after fire test corresponding to ISO and RABT heating corves. The results were summarized as following. The Flowability was gradually declined as the increase of fiber contents, and it was the most favorable with nylon(NY) fibers. The decrease of air contents due to increasing fiber contents was in order by polypropylene(PP), polyvinyl alcohol(PVA) and NY fibers. The compressive strengths were over 40 MPa at 7 days and 50 MPa at 28 days. It was in order by PVA, PP and NY fibers. For the spatting properties, all specimens were prevented at ISO heating curve. In the other hand, the partial spatting at the surface occurred on the plain without fibers, but it was prevented over 0.10 % of PVA and 0.05 % of PP and NY fibers at the RABT heating curve.
A Self-control Safety Management Activity Model in Construction Sites through Analysis of Success Factors
Lee, Joo-Sung ; Hong, Jung-Suk ; Kim, Jae-Jun ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 109~117
DOI : 10.5345/JKIC.2008.8.5.109
Recently, there has been constituted the government regulations and the normative methods to control the safety management activities in construction fields, but almost of these regulations are ineffective, because of some characteristics safety management have. The needs of the times make government regulations and the normative methods change to autonomic management methods. In this context, it is significant certainly to improve the standard of safety management that is used as a tool to protect the workers from the accidents or industrial disasters in the construction field. In this research, it will be showed that the outside regulations and safety management systems of the head office have their limits to reflect the safety managements of field participants. Then, it will be presented the improved model of self-control safety management activities which is essential for success safety management.
Estimation of the Strength Development of the Super Retarding Concrete Incorporating Fly Ash and Blast Furnace Slag
Han, Min-Cheol ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 119~125
DOI : 10.5345/JKIC.2008.8.5.119
In this paper, the estimation of super retarding concrete incorporating mineral admixtures at the same time including fly ash(FA), blast furnace slag(BS) are studied based on maturity method. The setting time was retarded, as super retarding agent contents increase and curing temperature decreases. In addition, apparent activation energy by Arrhenius function was ranged from
KJ/mol with slightly difference along with mixture proportion. This value is smaller than existing value
KJ/mol. Based on strength development estimation. it exhibited comparable relativity between prediction value and measurement value. Therefore, this study provided effective strength development prediction value with super retarding agent contents and mineral admixture combination. Strength development prediction equation provided herein is possibly valid for estimating accurate strength development of the super retarding concrete at the job site.
A Study on Selection of Roof Waterproofing Method by analyzing Life Cycle Costing
Choi, Oh-Young ; Kim, Tae-Hui ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 8, issue 5, 2008, Pages 127~134
DOI : 10.5345/JKIC.2008.8.5.127
The purpose of this study is to propose the decision making technique in roof waterproofing method at the early construction stage. Selecting the suitable construction method is difficult because of the complex interrelationships between many factors of influencing the construction method selection. This study presents an example of selecting suitable method by analyzing LCC (Life Cycle Cost) in roof waterproofing work. In this study, roof waterproofing method is analyzed by LCC(Life Cycle Cost) which is consists of the initial costs, running costs, and removal costs. Sheet waterproofing, membrane waterproofing and asphalt waterproofing costs are compared to select the most economic method. The result of this study revealed that considering LCC is useful in selecting the proper method in the construction work.