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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Building Construction
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Journal DOI :
The Korean Institute of Building Construction
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Volume & Issues
Volume 16, Issue 4 - Aug 2016
Volume 16, Issue 3 - Jun 2016
Volume 16, Issue 2 - Apr 2016
Volume 16, Issue 1 - Feb 2016
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Engineering Character of Ultra Rapid Hardening Concrete-Polymer Composite using CAC and Gypsum Mixed CAC
Koo, Ja Sul ; Yoo, Seung Yeup ; Kim, Jin Man ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 97~105
DOI : 10.5345/JKIBC.2016.16.2.097
Recently, application case of the ultra rapid hardening concrete-polymer composite(URHCPC) are increasing to repair for the deterioration of pavement. But it is a major disadvantage that the main material is expensive and has environmental load. For these reasons, the development of the economic, eco-friendly materials is needed. Calcium Aluminate Composite (CAC), produced by rapid cooling of atomizing method with molten ladle furnace slag, is a material capable of improving the economic feasibility and reducing the environmental load of URHCPC. In this paper, the properties of CAC and gypsum mixed CAC (GC) as alternative materials of RSC according to the types of polymer dispersion were studied. The results were as follows; compressive strength, tensile strength, flexural strength, bonding strength and modulus of elasticity of the composites using CAC or GC showed higher values than those of plain proportion in 3 hour. In later age, they were at the same level as the general proportions. URHCPC using BPD as polymer dispersion had superior strength properties generally. But modulus of elasticity was the same level as the case of using a SBR latex. According to these results, CAC or GC can partially substituted for RSC to product the URHCPC. When URHCPC uses the BPD as the polymer dispersion, it can be improved performance.
An Experimental Study on Evaluation of Bond Strength of Arc Thermal Metal Spaying According to Treatment Method of Water Facilities Concrete Surface
Park, Jin-Ho ; Lee, Han-Seung ; Shin, Jun-Ho ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 107~115
DOI : 10.5345/JKIBC.2016.16.2.107
In this study, the bond strength of metal spraying system by surface treatment of concrete (waterproof/corrosion method) in water treatment facilities was evaluated. The results showed that the system with Sa-P-R-(S) (sanding-perviousness surface hardener-surface roughness agent-metal spraying-sealing) led to the desirable performance. The bond strength, the coefficient of water permeability and air permeability were 3.7MPa,
, respectively. In scanning electron microscope analysis, the microstructure of specimen coated with perviousness surface hardener was much denser than that without it. Therefore, the specimen coated with sanding-perviousness surface hardener-surface roughness agent-metal spraying-sealing had the best bond performance and was the most suitable system to concrete surface in water treatment facilities.
Effect of Waste Glass Wool on Mechanical Properties of Concrete
Kim, Jeong-Tae ; Choi, Woo-Hyuk ; Chung, Chul-Woo ; Lee, Jae-Yong ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 117~123
DOI : 10.5345/JKIBC.2016.16.2.117
Glass wool is a material that has been used as a heat insulator in various fields including construction industry. Since it is a nonflammable material, it does not generate toxic gases on fire, and thus public agencies recommend using glass wool as a heat insulator instead of other organic materials. However, repeated drying and wetting cycles can deteriorate thermal property of glass wool due to the shrinkage and reduction in pore size. For this reason, it needs to be replaced periodically, and waste materials are generated. This research aims to utilize waste glass wool as additives for increasing mechanical properties of concrete. According to the experimental results, it was found that glass wool has weak pozzolanic activity, and beneficial effect on both compressive and flexural strength. The optimum amount found in this experimental work was 0.5% volumetric addition to the concrete.
Performance Evaluation for the Application of Roof Green Box Unit System Combined with Engineering P.E.Waterproof and Root Penetration Sheet
Oh, Chang-Won ; Hong, Jong-Chul ; Park, Ki-Bong ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 125~131
DOI : 10.5345/JKIBC.2016.16.2.125
According to the increment of urban buildings, the demand of eco-environment space will be also increased. Therefore, the artificial ground green system on a roof will be supplied gradually. In this study, the concept of simplification, unification and prefabrication was widely applied to supply green system. Consequently, the box unit system with a continuous soil layer was developed, and adhesive property, wind resistance and insulation property of this system were evaluated for site application. As a results of adhesive property and wind resistance test, comparing with design wind pressure and wind velocity, this system was safe at the height of 100m building located in urban. In addition, results of temperature measurement for 120 days showed 17% higher insulation property at daytime and 45% higher insulation property at night than normal box unit system owing to continuous soil layer.
Digital Pen System for Inputting the Actual Amount of Labor Input at Construction Site
Kim, Daewon ; Kim, Tae-Yong ; Shin, Yoonseok ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 133~140
DOI : 10.5345/JKIBC.2016.16.2.133
The amount of labor input in a construction project is used as source data to estimate construction cost and to understand the productivity of the construction industry. However, there is a significant difference between the standard of estimation and the actual amount of labor input, and a plan is needed to resolve this problem. For this reason, to establish a system with which the actual amount of labor input can be inputted in a more accurate and simpler manner, a new method is proposed in this study. In the new method, a digital pen is used to minimize the difference from traditional handwriting on paper using a pen, and eliminate the redundant input of information. This study is expected not only to reduce the actual amount of labor input but also to contribute to the productivity of construction cost estimate through the sharing or utilization of the information on the web.
A Study of LCCA and LCA to Evaluate Feasibility for Introducing Smart Quiescent Power Control System into Office Building
Quan, Junlong ; Lee, Seok-Jung ; Choi, Hye-Mi ; Kim, Kyung-Hwan ; Kim, Ju-Hyung ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 141~149
DOI : 10.5345/JKIBC.2016.16.2.141
Recently, in an attempt to overcome the defects of quiescent power shutdown system, smart quiescent power control system has been developed. However, due to its higher investment costs, feasibility evaluation must be conducted. While LCCA (Life Cycle Cost Analysis) model is useful to estimate net savings of alternatives that differ with respect to initial costs and operating costs, the environmental burdens are not considered. On the contrary, LCA (Life Cycle Assessment) model is suitable to assess environmental impacts associated with the stages of a product`s life but it does not consider costs. In this study, a comprehensive analysis on the economic and environmental impacts of smart quiescent power control system is conducted by using LCCA and LCA model. In addition, sensitivity analysis is carried out to quantify accuracy of estimates.
Optimization of T/C Lifting Plan using Dependency Structure Matrix (DSM)
Kim, Seungho ; Kim, Sangyong ; Jean, Jihoon ; An, Sung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 151~159
DOI : 10.5345/JKIBC.2016.16.2.151
Tower crane (T/C) is one of the major equipment that is highly demanded in construction projects. Especially, most high-rise building projects require T/C to perform lifting and hoisting activities of materials. Therefore, lifting plan of T/C needs to reduce construction duration and cost. However, most lifting plan of the T/C in construction sites has still performed depending on experience and intuition of the site manager without systematic process of rational work. Dependency structure matrix (DSM) is useful tool in planning the activity sequences and managing information exchanges unlike other existing tools. To improve lifting plan of T/C efficiently, this study presents a framework for the scheduling T/C using DSM through the case study in real world construction site. The results of case study showed that the scheduling T/C using DSM is useful to optimize the T/C lifting plan in terms of easiness, specially in the typical floor cycle lifting planning.
Factors of Influencing the Communication of Building Construction Field Organizations
An, Sung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 161~167
DOI : 10.5345/JKIBC.2016.16.2.161
The collaboration with members are very important things to manage the field organization in the building construction project. These collaborations are related with the communication in the organization, so the field organization ability could be advanced by improving the communication level. However, the research about communication in building construction field organizations has rarely studied. Therefore, the purpose of this study is to analyze the organizational factors to influence the communications in building construction field organizations. In this study, the leadership style of head managers and organizational cultural characteristics is determined the factors to influence the communication level by literature reviewing. The results of this study showed that the communication level is good when head managers in building construction site had an idealized influence style leadership and individual consideration style leadership. In addition, the good communicated field organizations had the higher characteristics of a consensus culture and development culture. This study is expected to help to improve the performance of the building construction field organizations.
Survey on CAD Softwares Used in Small Contractors and Improvement to College CAD Education
Choi, Heebok ; Jang, Myung-Houn ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 169~175
DOI : 10.5345/JKIBC.2016.16.2.169
A survey of small-size contractors in Jeju was conducted to investigate college graduate`s CAD (computer aided design) competence. Most of small-size contractors use CAD softwares to review and update drawings submitted from an architect. This research analyzed the curriculum of the architectural engineering in several national universities. The CAD classes have 4 or 6 hours per week and use AutoCAD primarily. This research proposes that a CAD class needs at least 6 hours per week, 2D drawing is the main theme in the curriculum, and exercises to make 3D models are also included in the CAD class. The improved methods, Internet cafe and real time feedbacks using a smartphone, to evaluate the reports and exercise results are necessary.
Daily Reporting System using Digital Pen at Construction Site
Shin, Yoonseok ; Kim, Daewon ; Kim, Tae-Yong ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 177~183
DOI : 10.5345/JKIBC.2016.16.2.177
The daily report includes the most detailed information and various daily planning and performance data recorded at a site, and includes work types, the number of workers, and the equipment and materials used. However, in the daily reporting process, some information can be omitted or distorted or even made redundant due to there being several steps of manual input. For this reason, the daily report is utilized for a simple report rather than for an appropriate purpose. Thus, to resolve the issues of the existing daily report system mentioned above, a daily report system using a digital pen was developed and then applied to an actual construction site to verify its applicability. As a result, it was found that 96.610% recognition accuracy of handwritten letters could be achieved. In addition, it was no longer necessary to enter the same information multiple times and no additional training or education for using a mobile device was needed. The digital pen-based daily report program developed in this study is expected to contribute to an improvement of information management efficiency and site document management work by addressing the problems of the existing report system.
The Use of Semi-Adiabatic Calorimetry for Hydration Studies of Cement Paste
Chung, Chul-Woo ; Kim, Ji-Hyun ; Lee, Soo-Yong ;
Journal of the Korea Institute of Building Construction, volume 16, issue 2, 2016, Pages 185~192
DOI : 10.5345/JKIBC.2016.16.2.185
The semi-adiabatic calorimetry technique is a robust and easy technique that can be used to measure the temperature rise of concrete. This method is often used for investigating the maturity of concrete, as well as to predict maximum temperature rise of mass concrete using various heat loss compensating models. Semi-adiabatic calorimetry can also be used for predicting setting time of concrete. However, it has seldom been used to investigate the hydration characteristics of various cement paste samples. In this research, semi-adiabatic calorimetry and X-ray diffraction methods were used to investigate the hydration characteristics of 3 different ASTM type I Portland cements. First derivative of temperature rise (dT/dt) curve was used to isolate individual peaks. Based on the results of the experiments, a combination of dT/dt curve with XRD could be used to successfully identify hydration at a specific time period, showing its potential to be used as an alternative tool for hydration studies of cement-based materials.