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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 12, Issue 6 - Dec 2012
Volume 12, Issue 5 - Oct 2012
Volume 12, Issue 4 - Aug 2012
Volume 12, Issue 3 - Jun 2012
Volume 12, Issue 2 - Apr 2012
Volume 12, Issue 1 - Feb 2012
Selecting the target year
Performance Evaluation of Cement Mixed Polymer Type Waterproofing Material
Oh, Dong-Sik ; Go, Seong-Seok ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 1~9
DOI : 10.5345/JKIBC.2012.12.1.001
This study aims to propose a performance metric for the application of a horizontal air-exhausting system to be used for the reduction of vapor and/or moisture that exists in the waterproof layer, by evaluating the physical properties. For this reason, tests in accordance with current standards were carried out, and the results were examined. Finally, a proposal was established for a general performance metric that could be applied as fundamental data based on the user's judgment. This has some limitations, in that the object is existing merchandise, however it should be useful for application in the construction field. In the future, analysis of a wider area, including workability, should be added in the phase of field application.
Analysis of Quality Improvement Priority for Construction PMIS
An, Hyo-Kyung ; Lee, Seul-Ki ; Lee, Hyoung-Lak ; Yu, Jung-Ho ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 10~21
DOI : 10.5345/JKIBC.2012.12.1.010
As one of the key IT applications, the project management information system (PMIS) played a significant role in construction management processes in Korea. On increasing use of PMIS, regular quality assessment to identify user's requirements of PMIS is necessary. However, there have been rare research efforts for quality assessment for the construction PMIS. This paper aims to propose a priority index of quality improvement for construction PMIS using the importance and satisfaction measures and to verify the discrimination power of the priority index by comparing it with other quality improvement priority index. In addition, this paper discusses some possible ways of PMIS quality improvement. The analysis of quality improvement priority was based on a questionnaire responded by 253 PMIS users (construction managers and constructors). The methods of PMIS improvement were based on the interviews with eight experts. These findings would be the foundation of further researches on PMIS quality improvement. However, more efforts are required to enhance the priority index, in terms of reflecting weighted values of quality assessment factors.
Influence of Foaming Agents on the Properties of Foamed Concretes Having Various Densities
Kim, Jin-Man ; Jeong, Ji-Yong ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 22~30
DOI : 10.5345/JKIBC.2012.12.1.022
Four types of foaming agents, including Alcohol Ethoxy Sulfate (AES), Alpha Olefin Sulfonate (AOS), Vegetable Soap (VS), and Fe-Protein (FP), are widely used in the construction field. These have different surface tensions and viscosities in water of the same concentration, affecting the flow speed of liquid, size and distribution of foam, and foam stability. However, there is a lack of data regarding the properties of foam concrete using various foam agents. The purpose of this study is to investigate influence of foaming agents on the properties of foamed concretes with various densities. We find that the foaming agent type has little effect on the density, compressive strength, and thermal conductivity of foam concrete, but considerably affects the unit weight of foam, flow and flexural strength of foamed concrete. While almost all properties of foam concrete are affected by density in fresh or hardened state, the potential energy changed by slurry density and the viscosity of foam are dominant factors in the flowability of foam slurry.
Analyzing the Priority of Leadership Elements for Project Manager of Building Construction Project
Kim, Jin-Dong ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 31~41
DOI : 10.5345/JKIBC.2012.12.1.031
In construction, the outcome of work depends on the leadership of the project manager, and as a result this has been emerging as an important factor. The purpose of this study is to analyze the main elements of leadership that are essential for project managers, and to rank these elements in order of importance. In this study, leadership and its elements are reviewed through reviewing the literature, and the main elements and their relative importance for project managers were analyzed through questionnaire survey of project managers, contractor engineers, and subcontractor engineers. Through this survey, it was found that the project manager's leadership had a significant influence on the success of a construction project, and this study revealed that the key elements of leadership for project manager could be ranked in the order of resolution, responsibility, and reliance.
Analysis on Legal Issue of Lawsuits and Subjective Judgment on Defects in Apartment Building
Park, Jun-Mo ; Seo, Deok-Seok ; Choi, Jeong-Hyun ; Kim, Ok-Kyue ; Park, Kang-Woo ; Jo, Jae-Hun ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 42~53
DOI : 10.5345/JKIBC.2012.12.1.042
Lawsuits related to defects in apartment buildings involve a range of legal issues, based on which the current subjective judgment system has been established. This study aims to organize the judgment system by stage of lawsuit from a legal perspective by reviewing the factors dealt with in precedent research. The main issues at hand include assignment of obligation, the day on which the computation of exclusion period begins and the day on which the defect repair is completed. The rationality of the current subjective judgment system could be determined by reviewing the recent cases. Based on the findings of the review, the following are suggestions for improvements and complements of the system. First, the process of assignment of obligation should be systemized, and the guarantee insurance system that provides a warranty deed should be improved as well. In addition, improvements and systemization should be made to clarify the responsibilities for any defect arising from the agreements that are not stipulated on the contract, computation of abatement rate of compensation and the system by which the responsibility for the defects is completed when residents acquire ownership from rental status.
Strength Properties According to the Conditions of Low Carbon Inorganic Composite Using Industrial By-product
Lee, Yun-Seong ; Lee, Sang-Soo ; Song, Ha-Young ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 54~63
DOI : 10.5345/JKIBC.2012.12.1.054
The purpose of this study is to examine the potential for reducing the environmental load and
gas when cement is produced by using cement substitutes. These substitutes consisted of blast furnace slag, red mud and silica fume, which were industrial by-products. The most optimum mix was derived when alkali accelerator was added to low carbon inorganic composite mixed with industrial by-product at room temperature. It is determined that hardened properties and the results of compressive strength tests changed based on CaO content, Si/Al, the mixing ratio and the amount of alkali accelerator, curing conditions and W/B. The results of test analysis suggest that the optimum mix of low carbon inorganic composite is CaO content 30%, Si/Al 4, the mixed ratio of alkali accelerator
50g:50g, the amount of alkali accelerator 100g and W/B 31%. In addition, if contraction is complemented, low carbon inorganic composite with superior performance could be developed.
Performance Evaluation of Prepackaged-Type Low Shrinkage Surface Preparation Materials Using a VA/E/MMA Terpolymer Powder
Hong, Sun-Hee ; Kim, Wan-Ki ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 64~72
DOI : 10.5345/JKIBC.2012.12.1.064
Recently, prepackaged-type surface preparation materials using redispersible polymer powders are widely used for interior and exterior finishing in the construction work. The purpose of this study is to evaluate the performance and the quality of prepackaged-type surface preparation materials using a VA/E/MMA terpolymer powder. Surface preparation materials using a VA/E/MMA terpolymer powder were prepared with shrinkage reducing agent contents of 0, 4 % and cellulose fiber contents of 0, 0.5, 1.0 %, and tested for drying shrinkage, strengths, adhesion in tension, crack and impact resistance, water absorption, permeability. As a result, prepackaged-type surface preparation materials show outstanding performance depending on the shrinkage reducing agent and cellulose fiber contents.
The Properties of Mortar Mixtures Blended with Natural, Crushed, and Recycled Fine Aggregates for Building Construction Materials
Yu, Myoung-Youl ; Lee, Jae-Yong ; Chung, Chul-Woo ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 73~86
DOI : 10.5345/JKIBC.2012.12.1.073
In this research, the possible applicability of mixture blended with natural, crushed, and recycled fine aggregate are discussed. The fresh and hardened properties of mortar using blended fine aggregates are monitored depending on various blending ratio of fine aggregates. Newly developed ternary diagram was also utilized for better interpretation of the data. It was found that air content increased and unit weight decreased as recycled fine aggregate content increased. With moisture type processing of recycled fine aggregate, the mortar flow was not negatively affected by increase in the recycled fine aggregate content. The ternary diagram is found to be an effective graphical presentation tool that can be used for the quality evaluation of mortar using blended fine aggregate.
Estimation of Setting Time of Cement Mortar combined with Recycled Aggregate Powder and Cement Kiln Dust based on Equivalent Age
Han, Min-Cheol ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 87~97
DOI : 10.5345/JKIBC.2012.12.1.087
This paper presents a method of estimating the setting time of cement mortar incorporating recycled aggregate powder (RP) and cement kiln dust (CKD) at various curing temperatures by applying an equivalent age method. To estimate setting time, the equivalent age using apparent activation energy (Ea) was applied. Increasing RP and CKD leads to a shortened initial and final set. Ea at the initial set and final set obtained by Arrhenius function showed differences in response to mixture type. These were estimated to be from 10~19 KJ/mol in all mixtures, which is smaller than those of conventional mixture ranging from 30~50 KJ/mol. Based on the application of Ea to Freisleben Hansen and Pederson's equivalent age function, equivalent age is nearly constant, regardless of curing temperature and RP contents. This implies that the concept of maturity is applicable in estimating the setting time of concrete containing RP and CKD. A high correlation was observed between estimated setting time and measured setting time. A multiregression model was provided to determine setting time reflecting RP and CKD. Thus, the setting time estimation method studied herein can be applicable to concrete incorporating RP and CKD in the construction field.
BIM-Based Simulator for Rebar Placement
Park, U-Yeol ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 98~107
DOI : 10.5345/JKIBC.2012.12.1.098
Reinforcing bars (rebar) comprise an integral part of a concrete structure, and play a major role in the safety and durability of the building. However, the actual placement or installation of rebar is not planned and controlled by the detailer. Recently, 4D simulations, using 3D model and scheduling software, have been used to improve the efficiency of the construction phrase. However, 4D simulators have not been introduced at the detailed level of work, such as rebar placement. Therefore, this paper suggests a BIM-based simulator for rebar placement to determine the sequence with which rebar is placed into the form. The system using Autodesk Revit API automatically generates rebar placement plans for a building structure, and labels the placement sequence of each individual bar or set of bars with ascending numbers. The placement sequence is then visualized using Autodesk Revit Structure 2012. This paper provides a short description of a field assessment and limits.
Improved Escalation Method for the Cost Estimation System using Previous Bid Price in Public Construction Projects
Baek, Seung-Ho ; Kang, Tai-Kyung ; Lee, Yoo-Sub ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 108~114
DOI : 10.5345/JKIBC.2012.12.1.108
Escalation method examining the changes in price index has been widely utilized in public construction projects. The previous escalation method determined estimated changes in price based on the average unit price of contract items over a period of time. In relation to this method, the issue has been raised that the fluctuation rates of previous method show different trends compared with other related price indices, as the influence of the small group of contract items with large unit prices overwhelms the others. This research suggested an improved escalation method which estimates the fluctuation rate by examining the changes in CCI (construction cost index) and applies it to the total amount or the partial amount deducted for labor cost in price escalation for previous bid price method. To verify the improvement, a case study is conducted on an educational facility, and the fluctuation rate was estimated in two different base periods (short term, long term). The results over the long term showed similar tendencies to those of related price indices, as well as significant differences in fluctuation rates compared to those of the previous method.
An Experimental Study on the Mechanical Behavior of Concrete Using Non-Sintered Cement
Yoo, Sung-Won ; Min, Gyeong-Oan ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 115~121
DOI : 10.5345/JKIBC.2012.12.1.115
If cement could be manufactured with industrial byproducts such as granulated blast furnace slag, phosphogypsum, and waste lime rather than clinker, there would be many advantages, including the maximization of the use of these industrial byproducts for high value-added resources, the conservation of natural resources and energy by omitting the use of clinker, the minimization of environmental pollution problems caused by
discharge, and the reduction of the production cost. For this reason, in this study, mechanical behavior tests of non-sintered cement concrete were performed, and elasticity modulus and stress-strain relationship of non-sintered cement concrete were proposed. Nine test members were manufactured and tested according to reinforcement ratio and concrete compressive strength. According to the test results, there was no difference between general cement concrete and non-sintered cement concrete in terms of flexure and shear behavior.
Effect of PMIS Quality on Intention to Use and User Satisfaction
Sung, Min-Woo ; Kim, Ka-Ram ; Lee, Seul-Ki ; Yu, Jung-Ho ;
Journal of the Korea Institute of Building Construction, volume 12, issue 1, 2012, Pages 122~132
DOI : 10.5345/JKIBC.2012.12.1.122
Establishing a success model of a specific information system is critical to understanding the mechanism of IS success, the various dimensions of IS performance, and the factors and their causal relations in IS success. As one of the key IT applications, the project management information system (PMIS), particularly the web-based PMIS (Web-PMIS), has played a significant role in construction management processes in Korea. However, there have been few research attempts made to construct a Web-PMIS success model. This study primarily aims to propose a Web-PMIS success model based on DeLone and McLean's IS success model, and to discuss whether or not the D&M IS success model can be applied to the construction Web-PMIS. A questionnaire was sent out to Web-PMIS users (construction managers and constructors), and 253 completed questionnaires were received. Through multi-regression analysis, it was confirmed that it is statistically acceptable to apply the D&M IS success model to the Web-PMIS. However, the explanatory power of the model is not sufficient, and some of the model factors are not statistically significant enough. Relying on the statistical analysis results, this study also discusses the development direction for the Web-PMIS success model.