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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 14, Issue 6 - Dec 2014
Volume 14, Issue 5 - Oct 2014
Volume 14, Issue 4 - Aug 2014
Volume 14, Issue 3 - Jun 2014
Volume 14, Issue 2 - Apr 2014
Volume 14, Issue 1 - Feb 2014
Selecting the target year
Effect of Blast Furnace Slag on Rheological Properties of Fresh Mortar
Lim, Ji-Hee ; Lee, Gun-Cheol ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 285~291
DOI : 10.5345/JKIBC.2014.14.4.285
Partial replacement of cement with blast furnace slag has many advantages such as the reduction of construction fee, the decrease of hydration heat and the increase of long-term strength. Hence, slag is widely used in practice. This study investigates the effect of slag on the rheological properties of cement paste and mortar. Three different types of slag (BS1, BS2 and BS3) with five different contents (0, 20, 40, 60 and 80 wt.%) were used to replace the cement. Each type of slag has different fineness. Water to binder ratio was 0.5. Test results showed that the partial replacement of BS1 and BS2 decreased flow and increased O-lot flow time, whereas that of BS3 caused an opposite effect, i.e., increased flow and decreased O-lot flow time. It was found that there was a good corelation between the values of yield stress and flow.
Productivity Analysis for Strutural Formwork Using 3D BIM
Choi, Chang-Hoon ; Park, Young-Jin ; Soh, Ji-Yoon ; Kim, Sung-Yeon ; Lee, Junbok ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 292~300
DOI : 10.5345/JKIBC.2014.14.4.292
The construction progress control is very important because there are many unexpected factors affecting time schedule delay and cost overruns. A complicated measure including item quantity and inherent time and costs is used to monitor the progress. Another element to be considered is a productivity, which is cost effectiveness because productivity is primarily measured by the costs. Productivity is stated as constant in-place value divided by inputs such as worker-hour. The main purpose of this paper is to analyze the productivity of structural formwork using a 3D BIM. In order to achieve the research objective, an integrated model of a BIM with a daily foreman's report is developed. The quantities being extracted from a 3D model and information are integrated with manpower utilized. The developed model is applied to a case project to measure and analyze the productivity in terms of individual building and work crew team. The results are discussed and further research topics will be addressed.
Strength Properties of Alkali-Activated Lightweight Composites with Alkali Activators of Different Types and Amounts
Lee, Sang-Soo ; Kim, Yun-Mi ; Park, Sun-Gyu ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 301~307
DOI : 10.5345/JKIBC.2014.14.4.301
In order to reduce the emission of carbon dioxide(
), this research use blast furnace slag in concrete manufacture, as 100% replacement of cement. The aim of this study is to investigate the density and strength properties of alkali-activated lightweight composites with alkali activators of different types and different amounts. The bubble for achieving the lightweight of alkali-activated lightweight composites was generated in the reaction between the paper ash and the alkali activators instead of using a foaming agent. Lightweight formed concrete was conducted basic experimental for determining replacement ratio of paper ash. Then, the density and strength were measured according to the types and the contents of the alkali accelerator that can react with the paper ash. As results, the optimum replacement ratio of the paper ash was 5%. The alkali activator containing NaOH 12.5% obtained the lowest weight of
. Also, compressive strength were relatively high. Therefore, this study demonstrated that alkali accelerator with a certain amount of NaOH can achieve relatively high strength and lightweight alkali-activated lightweight composites.
Physical and Mechanical Properties of Magnesium Oxide Matrix depending on Addition Ratio of Magnesium Chloride
Kim, Heon-Tae ; Jung, Byeong-Yeol ; Lee, Sang-Soo ; Song, Ha-Young ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 308~313
DOI : 10.5345/JKIBC.2014.14.4.308
Recently, for longevity of resident building, the main trend is that the change of the inside space organization of resident building from wall construction to rhamen construction, which resulted in increase in use of lightweight composite panel. Thus, in this study, authors analyzed the engineering property of oxide of magnesium depending on the magnesium chloride addition ratio. The results of this research is expected to contribute on providing a fundamental material for the surface materials of lightweight composite panel. As the result of the experiment, as fluidity increased, air content decreased and initial set and final set as the magnesium chloride addition ratio increase. In the aspect of flexural strength and compressive strength, the test specimen showed the highest strength at 40% of the magnesium chloride addition ratio. At 20% of the magnesium chloride addition ratio, the test specimen showed the lowest water absorption rate. As the magnesium chloride addition ratio increases, the expansibility tends to increase as well in the aspect of shrinkage strain. After observing microstructure, we can see hydration products in the form of needle. It appeared high flexural strength because the hydration products have mineral fibrous tissue shape, which also contribute to the cause of the expansibility.
Reinforced-Concrete Works Productivity and Influence Factor Analysis on Nuclear-Power-Plant Project
Huh, Young-Ki ; Lim, Jin-Ho ; Kim, Kyoung-Uk ; Ahn, Young-Chul ; Oh, Jae-Hun ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 314~321
DOI : 10.5345/JKIBC.2014.14.4.314
Nuclear power plant projects are being increased all over the world. The construction of nuclear power plants needs huge money and time, which makes conducting a detailed analysis of productivity through the whole process. Reinforced-concrete works productivity field data was collected for more than one year and analyzed from a nuclear-power-plant project in Korea. The productivities of formwork, rebar-work, and concrete pouring were
, respectively. Moreover, it is revealed that 'Day of the Week' is a driver of the formwork activity and 'Overtime' is for all of the three. The results will be a great interest of industry personnel estimating time and cost of a new nuclear power plant.
Evaluation of Early Compressive Strength of Concrete Using Early Strength Improvement Type Cement and Early Strength Activator
Park, Gyu-Yeon ; Kim, Gyu-Yong ; Choe, Gyoeng-Choel ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 322~328
DOI : 10.5345/JKIBC.2014.14.4.322
In this study, revelation performance of concrete at early age according to types of cement, water reducing ratio of high performance superplasticizer and mixing of accelerator for early hydration was examined aiming for reduction of construction period of framework through securing strength at early age of concrete. It was observed that strength at early age, 5MPa in 12hours, 14MPa in 18hours, is secured by early strength improvement type cement and using promotion admixture for early hydration which are Sodium persulfate, Potassium hydroxide. Therefore cost reduction is expected to be possible in construction site by reducing construction period of frame work.
Interaction Analysis between Construction Business Indicators and Business Performance Indicators of Architect Specialty Contractors
Kim, Nam-Sik ; Lee, Dong Wook ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 329~335
DOI : 10.5345/JKIBC.2014.14.4.329
This study suggests architect specialty contractors' strategies by interaction analysis between construction business indicators and business performance indicators. To do this, a database was compiled for construction orders and business performance indicators of specialty contractors with KRW 7 bil. or more of assets of 1997 through 2010. The causal relationship verification and actual proof-oriented analysis were performed for architect specialty contractors. The result is analyzed that their turnover ratio of total liabilities and net worth are affecting obtention of construction orders, ultimately increasing the operating profits. Therefore, this type of specialty contractors is determined to be able to secure corporate stability by establishing a specific operation plan for the total assets.
Experimental Study of Reinforced High-Strength Concrete Beams without Stirrups Considering Shear Behaviour
Yang, Seong-Hwan ; Lee, Dong-Jun ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 336~342
DOI : 10.5345/JKIBC.2014.14.4.336
Shear strengths of reinforced high strength concrete beams without web reinforcement are studied with experimental analysis of 10 specimen with 2.4 shear span-to-depth ratio (a/d) beams for 4 stages of concrete compressive stength over 60MPa comparing ultimate loads and shear stresses of ACI363R and KCI code equations. Expecially, concrete compressive strengths used in shear design were essentially limited to 10,000 psi (69MPa) by ACI363R and KCI Code. The modified Code equation's shear stresses of the specimen without the limit are compared with test results. The comparison between the modified exist Code equations results and test results are expected to show an available scope to apply in construction field and to give considerations of design and contraction.
Correlation Analysis between Safety Education and Human Error by Construction Workers
An, Sung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 343~349
DOI : 10.5345/JKIBC.2014.14.4.343
The construction projects are larger and more complex, and so the construction accidents are bigger. Recently, the studies for reducing the human errors are researched to decrease the construction accidents. The purpose of this study is to analysis a correlation between the safety education and human errors by construction workers. The results showed that the frequencies of safety education in large sized construction projects are more than these in small sized construction projects. However, all of construction projects conduct lower times of safety education than the regulated times. In addition, it is revealed that the human errors of construction workers in large sized construction projects are being lower in accordance with increasing the safety education times. In small sized construction projects, however, the human errors of construction workers are increasing according to more times of safety education, reversely. This study should help to reduce the accidents in construction projects.
Characteristics of the Load of Small Hard Body Used for Impact Resistance Test of the Lightweight Wall
Choi, Soo-Kyung ; Song, Jung-Hyeon ; Kim, Sang-Heon ; Lee, Young-Do ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 350~358
DOI : 10.5345/JKIBC.2014.14.4.350
The demand for the lightweight wall has increased as the structure of the multi-unit dwelling has shift to the rahmen structure. The lightweight wall is required to secure certain degree of shock resistance for the structural safety. The study performed the load analysis test for 7 small hard bodies with different masses and shapes and 5 hard materials which applied the impact load on the wall. It was found out from the experiment that different pendulum weight doubled the load maximum even though the shock energy was the same. In addition, the study compared and analyzed the weight of materials and the load of small hard bodies to propose fundamental data for the material design of the lightweight wall.
Durability of Photocatalytic Cement after Nitric Oxide-Wet-Dry Cycling
Lee, Bo Yeon ; Kurtis, Kimberly E. ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 359~368
DOI : 10.5345/JKIBC.2014.14.4.359
Photocatalytic cement has been receiving attention due to its high oxidation power that reduces nitrogen oxide, thus contributing to a clean atmospheric environment. However, there has not yet been a thorough investigation on the effect of photocatalytic reactions on the durability of cementitious material, the parent material. In this study, photocatalytic cement samples were exposed to nitric oxide gas and UV along with cycles of wetting and drying to simulate environmental conditions. The surface of samples was characterized mechanically, chemically, and visually during the cycling. The results indicate that that the photocatalytic efficiency decreased with continued NO oxidation. The pits found from SEM indicated that chemical deterioration, such as acid attack or leaching, did occur. However, this was not confirmed by X-ray diffraction. The hardness was not affected, probably due to the formation of CSH as evidenced by the XRD pattern. In conclusion, it was found that photocatalysis could alter cementitious materials both chemically and mechanically, which could further affect long-term durability.
Lifecycle Health Assessment Model for Sustainable Healthy Buildings
Lee, Sungho ; Lim, Chaeyeon ; Kim, Sunkuk ;
Journal of the Korea Institute of Building Construction, volume 14, issue 4, 2014, Pages 369~378
DOI : 10.5345/JKIBC.2014.14.4.369
A system to analyze, assess and manage the health performance of resources and spaces throughout the project lifecycle shall be established to ensure sustainable healthy buildings. Decisions made in the planning, design, construction, and operation and management (O&M) phases must help sustain the health performance of buildings at the level specified by clients or the relevant laws. For this reason, it is necessary to develop a model to ensure the consistent management of performance, as such performance varies according to the decisions made by project participants in each phase. The purpose of this research is to develop a Lifecycle Health Assessment Model (LHA) for sustainable healthy buildings. The developed model consists of four different modules: the Health-friendly Resources Database (HRDB) module, which provides health performance data regarding resources and spatial elements; the Lifecycle Health-performance Tree (LHT) module, which analyzes the hierarchy of spatial and health impact factors; the Health Performance Evaluation (HPE) Module; and the Lifecycle Health Management Module, which analyzes and manages changes in health performances throughout the lifecycle. The model helps ensure sustainable health performances of buildings.