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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
Evaluation of Hardening Properties and Dry Shrinkage of Non-Sintered Binder Based Floor Mortar Utilizing Alpha-Hemihydrate Gypsum
Lee, Kye-Hyouk ; Kim, Gyu-Yong ; Lee, Bo-Kyeong ; Kim, Rae-Hwan ; Shin, Kyoung-Su ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 359~365
DOI : 10.5345/JKIBC.2015.15.4.359
Floor mortar experiences dry shrinkage by temperature and humidity difference of internal matrix with material type. Also, since floor mortar is influenced by environmental conditions during placing and curing period, cracks are likely to be occurred. In this study, it was evaluated the hardening and dry shrinkage properties of non-sintered binder based floor mortar utilizing alpha-hemihydrate gypsum which has expansibility in order to prevent crack of the floor mortar. It was applied to the construction site, and examined the effects of external environmental conditions on shrinkage deformation and cracking. Different types of slag accelerated initial and final setting in comparison with cement mortar and its compressive strength was satisfied standard compressive strength for floor mortar. Also shrinkage deformation behavior after the initial expansion exhibited a similar tendency with the cement mortar. From the field application result, no crack was found from slag mortar, and it is determined that the slag mortar has better dimensional stability than cement mortar caused by external environment conditions.
An Experimental Study on Hydration and Strength Development of High Blain Cement at Low Temperature
Mun, Young-Bum ; Kim, Hyeong-Cheol ; Choi, Hyun-Kuk ; Kim, Jae-Young ; Lee, Han-Seung ; Kim, Mok-Kyu ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 367~373
DOI : 10.5345/JKIBC.2015.15.4.367
In this study, fundamental properties of cement were reviewed to apply high fineness cement at low temperature environment. The classified high fineness cement has large proportion of particles below
which affects early hydration: an overall reaction of cement hydration faster. As a result of using high fineness cement, setting time of concrete was reduced and compressive strength was higher than OPC at all ages. Especially, compressive strength was more than double its value compared with OPC after three days curing in low temperature. Faster reaction and higher heat of hydration was verified by calorimetry early and maximum heat of hydration was analyzed by adiabatic temperature raising test. The analysis of this study confirmed that high fineness cement can be suitable to be used in low temperature environment.
An Experimental Study on the Concrete Pumping Technology of High Performance Concrete for the High-Rise Building Construction
Kim, Gyu-Dong ; Han, Cheon-Goo ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 375~381
DOI : 10.5345/JKIBC.2015.15.4.375
In this study, high performance concrete of C60 and C80 were applied to a super tall building and those had satisfactory properties of fresh and hardened concrete to the requirements even changes according to time. Especially the evaluation and analysis of the relation of the rheological properties and puMPability of high performance concrete, C60-14 which was applied to the height of from 500m to 575m in the building, was carried out bymeasuring pumping pressure and pumping speed, testing concrete properties at before and after pumping. As results, themax. pumping pressure showed increase of 5% at every 25m higher pumping and the average pumping speed showed the above
per hour whichmeans proper productivity. Additionally it was verified that the loss of slump flow after pumping was increased according to plastic viscosity values and the increment of temperature through concrete pumping.
Effect of Fiber Addition for Improving the Properties of Lightweight Foamed Concrete
Lee, Kyung-Ho ; Yang, Keun-Hyeok ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 383~389
DOI : 10.5345/JKIBC.2015.15.4.383
The objective of this study is to develop mixture proportioning approach of crack controlled lightweight foamed concrete without using high-pressure steam curing processes, as an alternative to autoclaved lightweight concrete blocks (class 0.6 specified in KS). To control thermal cracks owing to hydration heat of cementitious materials, 30% ground granulated blast-furnace slag (GGBS) was used as a partial replacement of ordinary portland cement (OPC). Furthermore, polyvinyl alcohol (PVA) and polyamid (PA) fibers were added to improve the crack resistance of foamed concrete. The use of 30% GGBS reduced the peak value of hydration production rate measured from isothermal tests by 28% and the peak temperature of foamed concrete measured from semi-adiabatic hydration tests by 9%. Considering the compressive strength development, internal void structure, and flexural strength of the lightweight foamed concrete, the optimum addition amount of PVA or PA fibers could be recommended to be
, although PA fiber slightly preferred to PVA fiber in enhancing the flexural strength of foamed concrete.
Assessment of Evaluation by Hybrid Waterproof-Roof Barrier Layer for Green System on Artificial Ground
Oh, Chang-Won ; Hong, Jong-Chul ; Park, Ki-Bong ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 391~396
DOI : 10.5345/JKIBC.2015.15.4.391
The demands about eco friendly space are increased as buildings are denser in downtown, and green system on the roof and the artificial ground are widely being applied. The construction of green system applies a waterproof layer, a root barrier and a protection concrete layer. Assembly of these many layers leads to a long construction term, and cause many defects. This study is to evaluate one layer-hybrid sheet which gets waterproof and root barrier performance simultaneously, which is developed to use in the new green system. As results, the performances of physical properties, durability, waterproof and root barrier not only exceeded quality standards but also showed excellent durability. In addition, mock-up test would be proceed to certify long term performance.
An Ordinary Management System for Updating Construction Equipment Prices in the Poom-Saem Based on the Standard Market Price1
Ahn, Bang-Ryul ; Tae, Yong-Ho ; Kim, Dae ; Huh, Young-Ki ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 397~404
DOI : 10.5345/JKIBC.2015.15.4.397
Construction equipment cost is critical to estimate the total construction costs, particularly in large and complicated projects. Public construction projects are typically estimated using the Poom-Saem which includes hourly rates for workers and equipments. Despite its importance, the construction equipment cost may not properly reflect the current market value because it is being updated every six years at most. To keep the data for construction equipment cost estimation up to date, it is highly recommended to use the standard market price that is reported each year by the Ministry of Security and Public Administration (MOSPA). However, there is still a wide gap to directly adopt the standard market price for updating the construction equipment prices. Therefore, this paper suggests an effective way to develop an ordinary management systems for updating construction equipment prices in the Poom-saem based on the standard market price.
Determining Decision-making Factors for the Selection of Contract Methods in Public Construction
Kim, Dae-Gil ; Lee, Ung-Kyun ; Lee, Hak-Ju ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 405~412
DOI : 10.5345/JKIBC.2015.15.4.405
The procurement of public construction, which has been selected mainly on the basis of the work experience of a department of public agencies that award construction contracts or those in charge of ordering, has not been executed through an objective selection process considering the construction types or characteristics. Thus, as a preliminary study on developing a model for the selection of contract methods, this study intends to analyze and present the key factors affecting the selection of procurement methods in public construction. Through a literature review on the existing methods, foundational factors were first presented, based on the analysis of these factors, the final influence factors were proposed. As a result, 6 factors contractor`s characteristics, the environment of the construction market, relevant organization, the characteristics of a project, costs, and responsibility factors were determined, and 14 sub-factors were selected. The factors presented in this study will be used as base data for developing a decision making support model for the selection of contract methods in public construction.
The Conceptual Framework of Concurrent Construction Method for EIFS in Apartment
Lim, Hyunsu ; Kim, Taehoon ; Cho, Hunhee ; Kang, Kyung-In ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 413~423
DOI : 10.5345/JKIBC.2015.15.4.413
Exterior Insulation and Finishing System(EIFS) is recognized as a promising alternative for energy reduction as energy reduction ratio of apartment is to be increased from 40% to 60% in 2017. However, EIFS is not actively applied to apartment because additional construction costs and duration are required for the current existing construction method of EIFS. Therefore, this study proposes a conceptual framework for concurrent construction method of EIFS which can reduce construction costs and duration by working sequentially from frame work to exterior insulation finishing work, and then verify the method`s feasibility by analyzing a case study. It has been proven from the analysis that concurrent construction method of EIFS reduces 6.7% of construction duration and 13% of construction costs compared with the conventional exiting method. The proposed method is expected to contribute to invigorated application of EIFS to apartment.
Analysis on Risk Factors of Reactor Containment Building Construction using Analytic Hierarchy Process
Shin, Dae-Woong ; Shin, Yoonseok ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 425~431
DOI : 10.5345/JKIBC.2015.15.4.425
Since the construction of Kori 1 was completed in 1978, the construction projects for nuclear power plant are increasingly expanded into domestic and foreign sites. However, some of construction sites of nuclear power plant have the problems of process delay and cost loss due to lack of ability of risk management. The construction of reactor containment building in nuclear power plant is especially dotted with many risk factors because it needs professional skills and large-scale resources due to long duration compared with different construction phase. Therefore, it needs the study that analyzes risk factors expected in construction of reactor containment building and suggests way of stable performance of projects. So, this study assesses risk factors of construction of reactor containment building. For the objectives, this study uses survey for group of minority specialists of 36 experts. The risks of 24 factors is classified by criterions of process, cost, safety, and quality and the results of assessment is analyzed by analytic hierarchy process. As the results, the importance and priority of risk factors classified by each criterion were calculated and the applicability of analytic hierarchy process was identified to analyze risk factors of nuclear power plant construction. These will be baseline data for risk management in construction phase of reactor containment building.
Analyzing of Job Satisfaction on the Designer/Construction Manager
Shin, Won-Sang ; Son, Chang-Baek ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 433~439
DOI : 10.5345/JKIBC.2015.15.4.433
The aim of this study is to suggest basic data about efficient motivation plans for improving the image of the design and Construction Management (CM) field and enhancing professional consciousness of employees. The major findings and conclusions of this study are as follows. First, the employees in design firms had a relatively high level of dissatisfaction with the `Reduction of work hours`, and those in CM companies had a relatively high level of dissatisfaction with the `Fringe benefit conditions`. Second, when the effects of the items of job satisfaction on overall job satisfaction were analyzed through factor analysis, job performance satisfaction had the biggest effect on the employees in design firms, and intrinsic reward and opportunity satisfaction had the biggest effect on those in CM companies.
An Unsafe Practice Analysis considering Potential Risk to Foreign Construction Laborers in Korea
Shin, Yoonseok ;
Journal of the Korea Institute of Building Construction, volume 15, issue 4, 2015, Pages 441~449
DOI : 10.5345/JKIBC.2015.15.4.441
Recently, the number of accidents reported involving foreign laborers has risen, and the need to prevent accidents at construction sites has become more urgent. It has been found that 90 percent of construction accidents are caused by unsafe work practices, and various studies have been conducted on these practices with the aim of preventing accidents at construction sites. However, the tendency with previous studies was to average the results of survey responses, and as a result it is impossible to consider the potential risk of how many foreign laborers feel unsafe in relation with the unsafe practices. Therefore, in this study, importance-performance analysis (IPA) was improved in order to assess the potential risk of the unsafe practices of foreign laborers at construction sites in Korea. To verify the applicability of the improved IPA, a survey was carried out, and then the results were compared with those of the IPA. Through the use of the improved IPA, unsafe practices that were not found in the previous IPA but have potential risk were identified. The method proposed in this study is expected to contribute to the prevention of construction accidents of foreign workers by enabling a more efficient management.