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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
Evaluation on the Mechanical Properties of Strain Hardening Cement Composite by Mixing Method for Application at Building Construction Site
Jeon, Young-Seok ; Kim, Gyu-Yong ; Nam, Jeong-Soo ; Kim, Young-Deok ; Jeong, Jae-Hong ; Lee, Seung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 530~537
DOI : 10.5345/JKIBC.2011.11.6.530
The purpose of this study is to examine material performance of fiber reinforced cement composite for mass production. It is necessary to manufacture SHCC(Strain Hardening Cement Composite) by batch plant for field application and mass production. For the study, a mock-up test of SHCC manufactured in the batch plant was conducted, and the performance was compared with SHCC manufactured in the laboratory. Assessment items were freshness and hardening properties. Specifically, direct tensile test machine was used for performance verification of SHCC. As a result, there was a tendency of less satisfactory fiber dispersion and performance of strain hardening compared with the performance of SHCC manufactured in the laboratory. To address this, dry mixing and mortar mixing time should be increased compared to laboratory mixing, and injection time of an agent such as a water reducing agent should be properly controlled according to mixing combination, or the capacity to secure dispersion and homogeneity of material.
Strength and Autogenous Shrinkage of High Strength Mortar Using Water Substituting Liquid
Han, Min-Cheol ; Lee, Dong-Gyu ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 538~546
DOI : 10.5345/JKIBC.2011.11.6.538
This paper is to experimentally investigate the strength and autogenous shrinkage of high strength mortar with the 20 % of water?binder ratio(W/B). In this study, the water substituting liquid(WSL) was used including gasoline, light oil, lamp oil, edible oil, HFE, ethanol, methanol and acetone in order to explore changes in strength and autogenous shrinkage depending on WSL type and replacement. For fresh properties, the replacement of WSL did not affect the fluidity of mortar mixtures considerably, except for ethanol and methanol. However, the replacement of WSL resulted in a slight decrease in flexural and compressive strength. For autogenous shrinkage, the replacement of WSL led to reduce autogenous shrinkage, and especially, the replacement of edible oil led to reduce autogenous shrinkage significantly due to saponification between edible oil and cement.
Sulfate Attack According to the Quantity of Composition of Cement and Mineral Admixtures
Ahn, Nam-Shik ; Lee, Jae-Hong ; Lee, Young-Hak ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 547~556
DOI : 10.5345/JKIBC.2011.11.6.547
The primary factors affecting concrete sulfate resistance are the chemical composition of the Portland cement, and the chemistry and quantity of mineral admixtures. To investigate the effect of those on the sulfate attack, the testing program involved several different mortar mixes using the standardized test, ASTM C1012. Four different cements were evaluated, including one Type I cement, two Type I-II cements, and one Type V cement. Mortar mixes were also made with mineral admixtures, as each cement was combined with three different types of mineral admixtures. One Class F fly ash, one Class C fly ash, and one ground granulated blast furnace slag (GGBFS) were added in various percent volumetric replacement levels. Expansion measurements were taken and investigated with the expansion criteria recommended by ASTM.
Properties of Low Density Foamed Concrete for Building Construction Using Anionic Surfactants of Synthetic and Natural Materials
Jeong, Ji-Yong ; Kim, Jin-Man ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 557~566
DOI : 10.5345/JKIBC.2011.11.6.557
The surfactants facilitate the formation of foam bubbles under a proper condition and provide stability of foam bubbles by decreasing the surface tension of solutions and increasing the viscosity of foam surface. However, there have been almost no practical data of foam concrete in this regard so far. This study aims to understand the effects of foaming agents such as anionic synthetic surfactant and anionic natural material surfactant on the low density foamed concrete. From the experiment, the vegetable soap of anionic natural material surfactants showed a higher foaming rate, more open pores, slightly lower compressive strength, and a higher permeability coefficient compared to the vegetable soap of anionic synthetic surfactants. It is believed that the natural material surfactants make not only the surface tension of the solution low but also the viscosity of slurry high.
An Analysis of a Request for the Development of Computer Application Technology in an Architectural Construction Management System
Kwon, Choon-An ; Ji, Suk-Won ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 567~575
DOI : 10.5345/JKIBC.2011.11.6.567
With the development of construction information, a computerization tool for architectural process control is a necessary tool. However, the reality is that the conditions and understanding of users are not sufficient to fully utilize such a tool. In particular, it was analyzed that the reason for the negative feedback from hands-on workers regarding the current process control information system is that there is a difficulty in accessing the system for users that are not process and planning experts, due to a lack of information and technical contents at the phase of control and planning prior to the process plan. Therefore, the demands of users and a direction for the improvement of a system in terms of optimizing process control computerization were investigated, with the aim of addressing the disadvantages of the existing system and developing a professional system that is specialized in the construction industry. Therefore, it is necessary to construct an integrated WBS (IWBS) that combines WBS with CBS, and subsequently, it is judged that the most important aspect is the integrated technology of compatibility and operation of data that is linked with OBS. The process information must then deal with the changing information; in other words, the amount of construction, construction cost, and the required construction period etc., by coding data into a 4-unit index, such as a project unit (WBS Level 1), a project facility unit (WBS Level 2), a management department unit (OBS Level 1), and a control manager unit (OBS Level 2). After that, it was found that it is necessary to develop a computer system to consistently integrate process information into a management department.
Influence Factors and Management based on Phase of Building Construction for the Improvement of Post Occupancy Indoor Air Quality
Lim, Hyoung-Chul ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 576~586
DOI : 10.5345/JKIBC.2011.11.6.576
In recent years, pollution in residential spaces has been a significant area of concern. In particular, the indoor air quality (IAQ) of an apartment building before occupancy, which is related to the interior material, is a serious problem. Unlike previous research, which has mainly focused on pollution control after construction, this study has derived influencing factors and priority of management with a controlling schedule for IAQ. The objectives of this research are 1) control of schedule or improvement of management for IAQ, 2) distribution of responsibility to the parties concerned (factory, material company, construction company, design and engineering, occupancy). The results show the relative priority of the four major items in wall?based apartment buildings and in column?based apartment buildings. An analysis of the parties responsible for improvement based on the IAQ results shows more efforts to improve IAQ are needed in material factories and engineering/design companies.
Strengths of Rapidly Hardening SBR Cement Mortars as Building Construction Materials According to Admixture Types and Curing Conditions
Jo, Young-Kug ; Jeong, Seon-Ho ; Jang, Duk-Bae ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 587~596
DOI : 10.5345/JKIBC.2011.11.6.587
Ultra rapid-hardening cement is widely used for latex-modified mortar and concrete as repair and finishing material during urgent work. The purpose of this study is to evaluate the improvements in strength made to SBR cement mortars by the adding of various admixtures and by the use of different curing methods. SBR cement mortar was prepared with various polymer-cement ratios, curing conditions and admixture contents, and tested for flow, flexural and compressive strengths. From the test results, it was determined that the flow of SBR cement mortar increased with an increase in the polymer-cement ratio, and the water reducing ratio also increased. The strength of cement mortar is improved by using SBR emulsion, and is strengthened by adding metakaoline. The strength of SBR cement mortar cured in standard conditions was increased with an increase in the polymer-cement ratio, and attained the maximum strengths at polymer-cement ratios of 15 % and 10 %, respectively. The maximum strengths of SBR cement mortar are about 1.8 and 1.3 times the strengths of plain mortar, respectively. In this study, it is confirmed that the polymer-cement ratio and curing method are important factors for improving the strengths of rapid-hardening SBR cement mortar.
A Proposal of Repair Cost Estimating Criteria for Persistent Defects in Apartment Houses
Lee, Hae-Jin ; Lim, Nam-Gi ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 597~608
DOI : 10.5345/JKIBC.2011.11.6.597
It has been often noted as a problem that as there are no objective and clear criteria for the repair cost estimate of persistent defects, when a claim arises in relation to an apartment construction, significantly different amounts of compensation may be given for similar defects based on the experience and tendencies of the construction experts asked to make a judgment. For this reason, this research aims to present defect managers with a more reasonable and objective estimation criteria and a system to determine the repair cost of defects based on an analysis of relevant factors. The research findings show that the historical cost system is applied first, and then a standard of estimation is used to estimate the cost for the items that are not included in the historical cost system. The criteria for the repair cost for each defect is as follows: the repair cost for defects arising from a regulation violation is determined by calculating the reconstruction cost of the parts in question after demolishing them; the repair cost for progressive defects is determined based on a contribution ratio proportional to the age of the building; the repair cost for repetitive defects is calculated by considering an alternative to maximize the intended function of the defective parts; and the repair cost for value depreciation defects is determined based on the ratio of the warranty period to the lapsed years. However, repair cost estimation for dual value depreciation defects should be studied in future research.
Weighing the CS Experts` Priority on the Quality of Each Housing Segment - Focused on Apartment Building Construction Projects -
Cho, Tae-Jea ; Choi, Jong-Soo ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 609~617
DOI : 10.5345/JKIBC.2011.11.6.609
For the past several decades, the residential housing market has been led by construction firms rather than consumers; in essence, it has been a suppliers` market. However, the market is experiencing a transition to a buyers` market, the implication of which is that there will be increased competition among the residential building suppliers. For this reason, it is necessary for construction firms to prepare new strategies to respond to the rapidly changing market environment. Furthermore, consumer satisfaction should be valued more highly than in the past, and should be a baseline in formulating construction product development strategy. For the pre-classified 13 apartment building segments, questionnaire surveys are conducted for the 50 CS (Customer Satisfaction) experts to evaluate their perceptions on the weighing of the quality of each apartment segment. Data obtained from a survey of experts was analyzed from an industry perspective utilizing the AHP technique. Analysis results indicate that the CS experts valued the kitchen & dining area more highly than all other segments. Specific analysis results and implications drawn from the study can be a valuable basis for marketing, product development, and quality management.
Development of a Musculoskeletal Load Measuring Device for Construction Workers Based on Accelerometers and Gyro Sensors
Kim, Kyoon-Tai ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 618~626
DOI : 10.5345/JKIBC.2011.11.6.618
The characteristics of construction work cause excessive strain on specific body parts of the construction craft workers. However, there are few tools to mane an accurate measurement of the load on the musculoskeletal system, and the musculoskeletal disorders (MSDs) experienced by the workers have not been properly understood. So, there is an urgent need for development of a tool to measure the load on the musculoskeletal system. Therefore, this research aims to develop a musculoskeletal load measuring device for construction workers. In order to eliminate the noise and errors, an accelerometer, gyro sensors and the Kalman Filter are used in the device developed in this research.
Development of Multidirection Incoming Salt Collector that Excludes Backward Wind
Park, Dong-Cheon ; Ahn, Jae-Cheol ; Kim, Woo-Jae ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 627~633
DOI : 10.5345/JKIBC.2011.11.6.627
Evaluation of the amount of chloride ion coming from the sea is very important in assessing the life expectancy of Reinforced Concrete structures. Developed in Japan, the incoming salt collector has been used to this day. Unfortunately, the incoming salt collector has had a bad reputation, which is caused by backward wind. Backward wind causes a reduction of the amount of salt collected in collector`s gauze. The collector was developed to eliminate the effect of backward wind. Simulation test in the laboratory and site measurement were performed to determine the amount of incoming salt according to the height. The performance was verified through analytic and experimental methods.
Greenhouse Test Results for Two Years of Sheet shaped Root Barrier Materials Apply to Green Roof System for Sustainable Building Construction
Jang, Dae-Hee ; Kim, Hyeon-Soo ; Choi, Soo-Kyung ;
Journal of the Korea Institute of Building Construction, volume 11, issue 6, 2011, Pages 634~644
DOI : 10.5345/JKIBC.2011.11.6.634
Recently, As a part of urban forestation, the introductions of green roofs into public projects has been actively driven. Supported by this policy, the sizes of domestic green roof related markets have been rapidly expanding and many types of root barrier materials developed in Korea or abroad are being commercially distributed. In this study, root barrier tests were conducted over two years with nine types of sheet type waterproof materials that are the most commonly used as root barrier layers in green roof systems. The test conditions prepared considered the climates, natural features and vegetation in Korea and the results and related root barrier performance were verified. From the results of this study, the necessity to improve the joint part of root barrier sheets and forming methods has been identified and a measure to improve domestic root barrier testing methods was proposed.