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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 15, Issue 6 - Dec 2015
Volume 15, Issue 5 - Oct 2015
Volume 15, Issue 4 - Aug 2015
Volume 15, Issue 3 - Jun 2015
Volume 15, Issue 2 - Apr 2015
Volume 15, Issue 1 - Feb 2015
Selecting the target year
Construction Performance of High Strength Concrete Utilizing Wasted Limestone Coarse Aggregates
Han, Cheon-Goo ; Kim, Ki-Hoon ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 545~551
DOI : 10.5345/JKIBC.2015.15.6.545
The aim of this research is suggesting application method of the wasted rock obtained from the limestone quarry of raw material for cement as a coarse aggregate for high strength concrete after crushing and sieving processes. The wasted rock has been normally wasted because of its low quality as a material for cement production. In this research, the concrete using this wasted limestone coarse aggregate was evaluated the constructability based on the performances of workability, air content, and compressive strength. From the experiment, a favorable performance was achieved with a limestone coarse aggregate for high strength concrete comparing to the high strength concrete using granite coarse aggregate.
Engineering Properties of the Non-Cement Mortar using the Fly ash from Combined Heat Power Plant and Recycled Fine Aggregate
Nam, Han-Kook ; Lim, Jeong-Geun ; Lee, Sang-Soo ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 553~559
DOI : 10.5345/JKIBC.2015.15.6.553
In this study, to suggest the application method of recycled fine aggregate, the non-cement mortar was prepared and studied with the binders of blast furnace slag, fly ash, and fly ash from combined heat power plant. As a basic experiment, a series of tests was conducted to determine the potions of the binders and types of activator. When the binder was consisted with 20% of fly ash and 40% of fly ash from combined heat power plant, the highest strength of the mortar was obtained, and as an activator, the combination of sodium hydroxide 2.5%, and calcium hydroxide 7.5% showed the highest strength of the mortar. Therefore, this study focuses on engineering properties of mortar contains fly ash from combined heat power plant and recycled fine aggregate according to replacement ratio of recycled fine aggregate based on the optimum mix from the basic experiment. As a result, the best replacement ratio of recycled fine aggregate is 75%.
Water Absorbtion Controlling Type Surface Treatment Method for Quality Enhancement of Recycled Aggregate
Choi, Heebok ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 561~567
DOI : 10.5345/JKIBC.2015.15.6.561
The research, in order to enhance the quality of recycled aggregate, was carried out the quality characteristics test of the recycled aggregates by applying the four kinds of surface treatment using a colloidal suspension of approximately 5nm~60nm particle size with the alkalinity of pH 10.2. The quality tests of recycled aggregate have been processed by specific gravity, water absorption, porosity, surface properties, and the compression and tensile tests. The colloidal suspension was coated effectively the surface of the old cement mortars of recycled aggregate with a constant thickness by colloidal suspension is being applied to the recycled aggregate surface under constant pressure of 100kpa and then it was dried in at
. The surface treatment method by the Method C out of 4 kinds of surface treatment improved effectively the quality of the recycled aggregates, whereby it obtained the best compressive strength and tensile strength of the recycled aggregate concrete.
Seismic Performance Evaluation and Economic Analysis of 5-Story RC Moment-Resisting Frames
Kang, Suk-Bong ; Kim, Sungdae ; Park, Eu-Su ; Oh, Sangmuk ; Son, Kiyoung ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 569~577
DOI : 10.5345/JKIBC.2015.15.6.569
Recently, the concept of seismic design has changed from prescriptive to performance based design. For the performance based design with the specified target performance of the structure, it is necessary to execute the inelastic structural analysis to predict precisely the actual behavior of the structure. To address this issue, the seismic performance of the 5-story RC moment-resisting frames designed in accordance with KBC2009 is evaluated through push-over analysis and economic analysis is conducted focused on the direct construction costs. The results show that the ordinary and the intermediate moment-resisting frame are evaluated to meet the required performance design criteria and that the direct construction costs of the two frames are similar. However, although the special moment-resisting frame designed with strong column-weak girder philosophy satisfies the required performance design criteria, the direct construction cost is uneconomical compared with other frames. Therefore, although the intermediate moment-resisting frame of design category D is prohibited in IBC2012, the ordinary and the intermediate moment-resisting frame are estimated to be more reasonable than the special moment-resisting frame for the design of 5-story RC moment-resisting frame.
Self Healing System for Concrete Surface Crack using Polymer based Coating Agent Incorporating Microencapsulated Healing Agent
Shin, Ki-Su ; Ryu, Byung-Chul ; Wang, Xiao-Yong ; Park, Ki-Bong ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 579~587
DOI : 10.5345/JKIBC.2015.15.6.579
In this paper, microencapsulated healing agent was embedded in the polymer matrix to obtain self healing properties. Microencapsulation of methacrylate using polyurea-formaldehyde as a shell material and studied the effect of agitation rate on capsule characteristics such as size, shell thickness, and surface morphology. The formation of microcapsules was confirmed by FTIR and TGA, and capsule characteristics were studied by optical microscopy and SEM. The self-healing effect was evaluated using permeability measurements and further confirmed by surface analytical tools including optical microscope. According to the experimental results, the microencapsulated healing system has the self-heaing ability for artificial cracks.
Evaluation on In-Site Compressive Strength of High-Strength Concrete Mass Elements under Cold Weather
Mun, Jae-Sung ; Yang, Keun-Hyeok ; Kim, Do-Gyeu ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 589~595
DOI : 10.5345/JKIBC.2015.15.6.589
This study evaluated the in-site compressive strength development of high-strength concrete developed for the mass structures under cold weather condition. Two mock-up wall specimens with
in dimension were cured under an average temperature of
. Core strengths measured at different locations of the mock-up walls were compared with the companion standard cylinder strengths. Test results revealed that the core strength of mock-up walls at an age of 3 days is higher by approximately 30% than the companion cylinder strength because of the high curing temperature effect generated from the heat of hydration of cementitious materials. Furthermore, comparisons with the prediction models based on maturity function confirmed that the effect of hydration heat on the curing temperature increase needs to be reflected to reasonably evaluate the on-site compressive strength development of concrete for mass elements.
Fire Resistance Performance Test of High Strength Concrete by Type of Mineral Admixture
Kwon, Ki-Seok ; Ryu, Dong-Woo ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 597~605
DOI : 10.5345/JKIBC.2015.15.6.597
The method of concrete mix design used in this study aims to achieve the identical specified design strength, applying different types and replacement ratio of mineral admixtures and afterwards, fire tests were conducted using the standard time-temperature curve specified in the ASTM E119 to identify the influences of the types of mineral admixtures on the fire resistance performance of high strength concrete(HSC). The least spalling was observed in the test specimen containing blast furnace slag as a partial replacement of cement, while the most significant spalling phenomena were observed in the blast furnace slag test specimen that silica-fume was added in. In particular, the reasonable volume of spalling was observed when solely replaced by silica fume. However, the influence of the cement replacement by silica fume and blast furnace slag on the increases of spalling can be explained through blocked pores by the fine particles of silica fume, leading to decreases in permeability.
Effects of Water-Repellent on the Color of Water Paint
Nam, Gee-Yung ; Kim, Ji-Hyun ; Lee, Jae-Yong ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 607~614
DOI : 10.5345/JKIBC.2015.15.6.607
Generally surface finishing of building is done with water paint that performs basic water repellency and resisting. When painting the exterior of the building with water paint, application method is easy and inexpensive and it has the advantage of building maintenance. But surface finishing of water paint is easy to discolored or aging due to ultraviolet light so the effect is not satisfying than expected. Therefore this study is to analyze durability of water-repellent paints mixed with water-repellents as outer surface finishing materials, and evaluate its feasibility. Color change and color different due to the accelerated time were tested, and the feasibility was evaluated based on the test results. The experimental results of color different, brightness different and chromaticity suggested that water-repellent paints mixed with water-repellents were suitable for finishing materials. Considering overall general durability performances, stable mixing ratios were 2, 5, and 8%.
Engineering Properties of HPFRCC Including Both Organic and Inoranic Fibers
Lee, Jong Tae ; Han, Cheon-Goo ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 615~620
DOI : 10.5345/JKIBC.2015.15.6.615
The high performance fiber reinforced cementitious composite (HPFRCC) controls the cracking development of the structure by inducing micro-cracking and strain hardening behavior after the initial cracking under the tensile conditions. Although, in Korea, the research about manufacturing the single-fiber reinforced cementitious composite or the mechanical properties of hardened status has been conducted, the research to apply the HPFRCC with multi-fiber is not sufficient. Hence, in this research, considering the workability and economic aspect for practical applications, the engineering properties of HPFRCC with combined long steel fiber (SL) and long organic fiber (OL) are evaluated such as workability and strength. As a result of evaluating the engineering properties of HPFRCC, the most favorable performance was obtained when the mixture contained 1.5% of combined SL and OL.
Development of Safety Training Delivery Method Using 3D Simulation Technology for Construction Worker
Ahn, Sungjin ; Park, Young Jun ; Park, Tae-Hwan ; Kim, Tae-Hui ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 621~629
DOI : 10.5345/JKIBC.2015.15.6.621
Construction worker safety and safety training continue to be main issues in the construction industry. In order to promote safety awareness among workers, it is imperative to develop a more effective and efficient safety training. This study compared two methods in construction worker safety training: 1) a conventional lecture and 2) 3D simulation through Building Information Modeling. Both training methods included the same contents, a selection of safety standard and guide suggested by Occupational Safety and Health Agency and the Korea Occupational Safety and Health Agency; the contents were then produced into two types of training methods. A survey was conducted targeting on safety managers, in which the managers evaluated lifelikeness, active learning and enjoyment that each of training methods can promote. The results of the survey showed that innovative method using 3D simulation was more effective than conventional lecture method in terms of its lifelikeness, active learning and enjoyment. This study will provide implications that innovative method using the virtual reality is more effective than conventional lecture method.
Development of a Height Adjustment Method of Prefabricated Individual Footing for the Leveling of Unit Modular Structural System
Jun, Young-hun ; Kim, Kyoon-Tai ; Chae, Myung-Jin ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 631~639
DOI : 10.5345/JKIBC.2015.15.6.631
In the unit modular construction, the unit module prefabricated in a factory with a high level of accuracy does not fit completely onto the ground-joint junction due to the low accuracy of the ground work. This difference in the level of accuracy can cause diverse problems, such as twisting the upper unit modules and loosening the connection between the module and the footing. On this background, the aim of this study is to develop a technique for adjusting the height of the prefabricated individual footing. To accomplish the aim, a height adjustment method using bolts and nuts is proposed, and a shop drawing and the construction sequence are also presented in this study. The structural safety is verified through a structure simulation. In the future, research will be conducted on a mock-up test of the height adjustment method developed in this study, and an analysis of economic feasibility will be performed in order to verify its constructability and usability.
Causes of Schedule Delays in Building Construction Projects in Vanuatu
Kim, Dae Young ; Chi, Seokho ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 641~651
DOI : 10.5345/JKIBC.2015.15.6.641
With its recent tourism boom, Vanuatu, a small country in the South Pacific, is experiencing an increasing demand for construction. However, it has been struggling with persistent schedule delays in their construction projects due to a variety of reasons. In an attempt to respond to this situation, this paper aims to identify the major causes of schedule delays in building construction in Pacific island countries, with a focus on Vanuatu. To collect data on the factors affecting schedule delays, face-to-face interviews were conducted. Based on these, seven major causes of schedule delays, as selected by the majority of the participants, were identified and discussed to provide perceptive insights for future improvement opportunities. This paper attempts to help contractors with limited resources better understand the major causes of schedule delay in Vanuatu and achieve better performance in building projects.
Evaluation of Construction RCB Exterior Wall Formwork according to Placing Height on Nuclear Power Plant
Song, Hyo-Min ; Sohn, Young-Jin ; Shin, Yoonseok ;
Journal of the Korea Institute of Building Construction, volume 15, issue 6, 2015, Pages 653~660
DOI : 10.5345/JKIBC.2015.15.6.653
Technologies for reducing construction duration are key factors in nuclear power plant construction projects, as a reduction in construction duration at the construction phase leads to a reduction in construction cost and an increase in profits through the early operation of the nuclear power plant. To analyze the constructability of the height of single-layer placement of formwork for the Reactor Containment Building (RCB) exterior wall through lateral pressure according to the height of concrete placement, the deformation criteria for formwork, and a new form design, 'MIDAS GEN (hereinafter referred to as MIDAS)' is used in this study. The cost and workload of formwork are derived according to the unit of height of the RCB exterior wall. Based on the result, it was found that the higher the RCB exterior wall, the higher the material cost, and the less the construction duration and the less the total number of formwork layers. Based on this result, it is believed that the material cost and the construction duration can be appropriately determined according to the formwork height.