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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
Evaluation of Hydration Heat of Mass Concrete with Capsulated Slurry PCM and FEM Study for Analyzing Thermal Crack
Park, ChangGun ; Kim, Bo-Hyun ; Lee, Han-Seung ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 379~388
DOI : 10.5345/JKIBC.2014.14.5.379
The purpose of this study is to investigate the effect of capsulated slurry phase change material (PCM) on the thermal crack in mass concrete by experimental work and FEM analysis. In this study, three conditions of samples were prepared for evaluating the level of hydration heat, i.e., a material condition, a cement paste condition and a concrete condition. Also, a compressive strength test was conducted for FEM inverse analysis. Based on the results of the experiment, exothermic function coefficients of concrete with encapsulated slurry PCM were deducted by the inverse analysis. After that, they applied to FEM analysis of the mass scale concrete structures. From the results of this experiment,
capsulated slurry PCM had no super cooling phenomenon in the material condition. In the cement condition, hydration heat decreased by 34.61J when PCM of 1g was mixed. In the concrete condition, PCM of 6% was deducted as the best level in hydration heat absorption. In FEM inverse analysis, rate coefficient of reaction gradually decreased when PCM mixing ratio increased. But, temperature-rise coefficient increased when PCM mixing ratio exceeded 6%. For the inversed exothermic function coefficients applying to large scale concrete structures, a thermal cracking index increased by 0.05 when PCM of 1% was mixed.
Influences of Slag Replacement on the Properties of Shotcrete Using a Slurry-Type Set Accelerator
Kim, Hyunwook ; Moon, Hoon ; Kim, Ji-Hyun ; Chung, Chul-Woo ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 389~396
DOI : 10.5345/JKIBC.2014.14.5.389
The set accelerator used for shotcrete at high pH environment often causes the dusting problem in practice. In this research, a slurry-type set accelerator was developed to avoid this problem and its effectiveness was investigated by applying it to shotcrete mortars. Set time, stiffening, compressive strength, and chloride ion penetration resistance were examined with different amounts of slag, used as partial replacement of cement. According to the experimental results, it was found that the earlier responses such as set time, stiffening, and 1-day compressive strength were probably affected by the amount of ettringite, formulated by the hydration between C12A7 and calcium sulfate polymorphs present in blast furnace slag. Whereas, it is believed that the result of compressive strength after 3 days was attributed to the hydration of tricalcium silicates. As for the results of a chloride ion penetration test, the partial replacement of cement with slag significantly reduced the total charge passed through the shotcrete mortar.
Anti-Corrosion Property of Geopolymer Evaluated by an Impressed Current Cathodic Protection Method, Exposed to Marine Environment
Lee, Hae-Seung ; Cho, Ggu-Hwan ; Park, Dong-Cheon ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 397~405
DOI : 10.5345/JKIBC.2014.14.5.397
There are many literatures reporting that the service life of re-bars in concrete structures is reduced in the oceanic environment due to chloride attack. To solve this problem, this study used geo-polymer as a mix material for concrete to increase its resistance to salt damage, and the external voltage method, one of the electric methods, is was applied to evaluate the likelihood of re-bars in the oceanic structure being exposed to the extreme salt environment. The items evaluated include the natural potential of re-bars and the corrosion rate. The results of the tests showed that in all of the salt environmental conditions (submerged zone, tidal zone, and crack), the tested materials were remarkably effective compared with ordinary concrete. The corrosion protective property was found not only in the evaluation of the natural potential but also in the evaluation of the corrosion rate, suggesting that the external voltage method can be used stably for geo-polymer RC structures in an extreme salt environment.
Method to Select Tower Cranes Using Augmented Reality in Smart Devices
Ryu, Han-Guk ; Choi, Heebok ; Jang, Myung-Houn ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 407~413
DOI : 10.5345/JKIBC.2014.14.5.407
Appropriate selection of lifting equipments for a high-rise building construction project is one of the important factors to the project`s success. Proper position of a tower crane on a construction site is so important to be determined by an expert or an experienced construction manager who draws working range of a tower crane and moves it over 2D(dimensional) site layout plan. 3D CAD, BIM, and virtual reality are is used for building design and construction, but it is not usual to use them for temporary facility planning or selection of a tower crane. This study proposes a suitable method to use augmented reality to select proper position of tower cranes. An augmented reality prototype is implemented by Vuforia and Unity 3D on a smart device to verify the practicability of the proposed method. The prototype application installed on a smart device shows several tower cranes on different markers in a real architectural drawing to locate the proper tower crane.
Presumption Method for Optimum Correction Rate of Total Construction Cost Using the Median based on Historical Data Analysis in Public Office Buildings
Yim, Jin-Ho ; Park, Jun-Mo ; Kim, Ok-Kyue ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 415~422
DOI : 10.5345/JKIBC.2014.14.5.415
There is growing difference between a planned value and an actual cost for increasing as an risk of construction cost. A construction cost index is an alternative to redeem a problem, but it is still very difficult to reduce an actual differential as a price fluctuation. Furthermore an existing theory of a construction cost index is overly complex, and is unsuitable for using in working-level. This study suggests an optimum correction rate in respect of a total construction cost. It is analyzing the actual cost of 53 public buildings that the Public Procurement Service ordered. The objects are main processes that include architectural works, mechanical works, electrical works, telecommunication works, and service facilities. It is compared a total construction cost based on absolute error rate using the median from frequentist principle. For this, it is selected the suitable regression model and set a correction rate.
Economic Analysis of Geothermal Energy Facilities Applied to Public Buildings
Jang, Young Jun ; Kim, Sangyong ; Shin, Yoonseok ; Kim, Gwang-Hee ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 423~432
DOI : 10.5345/JKIBC.2014.14.5.423
The aim of this study to propose an efficient method in selecting the type of new and renewable energy applied in at the planning phase of buildings. This study applied geothermal energy facilities with high adaptability to buildings. This study considered the energy reduction and reduced cost by comparing the values with the energy consumption before applying of geothermal energy facilities. In order to propose more reliable criteria of economic evaluation, maintenance costs reflecting the replacement cycles and initial construction costs by drawings and specifications for installation facilities for practical geothermal energy based on construction statement for life-cycle cost analysis. The results will help to effectively select economic types of facilities for new and renewable energy of the planning phase of buildings.
Hybrid Prototype of Performance and Prescriptive Specifications in Curtain Wall Construction
Lee, Jun-Ho ; Cho, Dong-Hyun ; Koo, Kyo-Jin ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 433~442
DOI : 10.5345/JKIBC.2014.14.5.433
The most design criteria and specifications in Korea utilized to ensure appropriate quality are based on process and prescriptive criteria determining materials, measure and methods. It has many problems including a loss of competitiveness resulting from inhibited creativity of the contractors. The performance-based specifications focused on final product are being proposed, but have difficulty in adapting to the architectural field. In this study the hybrid specification prototype for curtain wall construction was suggested. The specification framework was presented through analysis of linkage between the performance and prescriptive specification cases. Based on the survey with practitioners, the performance inspection process and the sample specification were developed by identifying the essential performance test timings. The applicability of the specification prototype was evaluated by interviews with experts. It was found that the prototype was active and a progressive supporting tool which could support to secure phased performance during construction as well as final performance.
Analysis of Effect of Risk Factors on the Success of Risk Management
Chung, Yeon-Kyo ; Chung, Byeong-Hwa ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 443~449
DOI : 10.5345/JKIBC.2014.14.5.443
Although risk reduction of construction projects have been continued, the risk of fatal accident has been increased. The purpose of this paper is to reduce the cause of the essential risk factors. Questionnaire survey of construction companies in domestic was conducted and the Multiple Regression Analysis of statistics program was used to grasp effective factors among the risk factors of construction companies in domestic. Development of the essential risk factors and its application to projects could lead to improvements such as compression of network, reduction of cost, improvement of quality and reduction of safety accident.
Improving the Safety Awareness of Construction Workers
Zhang, Zhen ; An, Sung-Hoon ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 451~457
DOI : 10.5345/JKIBC.2014.14.5.451
The construction industry has a higher mortality rate of accidents than other industries although safety is recently being more important, and it has become a serious problem that needs to be improved. To reduce the number of accidents at construction sites, improving the safety awareness of construction workers is urgent because the lack of safety awareness is one of the key reasons for construction accidents. For this reason, this study compares and analyzes the safety awareness of construction managers and construction workers. Our research shows that the safety awareness of construction workers is lower than that of construction managers, and they have a different perspective on safety management. The development plan for improving the safety awareness of construction workers based on these results is proposed, and it will potentially help reducing the frequency of accidents at building construction sites.
Interaction Analysis between Construction Business Indicators and Business Performance Indicators of Specialty Contractors providing Heavy Equipment
Kim, Nam-Sik ; Lee, Dong Wook ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 459~465
DOI : 10.5345/JKIBC.2014.14.5.459
This study is to suggest specialty contractors with countermeasures to construction orders falling off, one of the construction business indicators for the construction industry, by analyzing the impact of dwindling construction orders to business performance indicators of specialty contractors as well as identifying inter-relationships between those performance indicators. To do this study, a data was analyze for construction business indicators and business performance indicators of specialty contractors providing heavy equipment. For specialty contractors that provide and utilize heavy equipment, the amount of construction orders is imposing a lasting impact to the turnover ratio of current assets. Therefore, it is determined that a business strategy needs to be established in order to secure current assets to respond to decrease in construction orders.
Developing an Optimized Scheduling Process Model for Controlling the Noise in Construction Field
Lee, Seung-Hak ; Son, Jea-Ho ; Lee, Seung-Hyun ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 467~476
DOI : 10.5345/JKIBC.2014.14.5.467
According to the expanding of construction machinery works, the number of civil complaints demanding compensations are increasing continuously from surrounding residents due to the noise from construction fields. However, the noise is usually managed restrictedly during the construction phase rather than prevented in advance. So, the efforts to solve the noise problem are occurring only after complaints have been made. Also, excessive cost and time consuming in order to solve the complaints negatively affects to construction companies. Therefore, the purpose of this study is to develop an optimized scheduling process model for controlling the noise in construction field by considering the planned time, cost, and the number of equipment before construction. In addition, this process model is expected to provide a useful information about the cost comparison between the original planned cost plus compensation and the optimized cost considering noise limitation so that the site managers can manage their projects effectively.
Study on Improvement of Cost Calculation Method in Construction less than One Day Workload
Shin, Dae-Woong ; Lee, Young-Do ; Shin, Yoonseok ; Kim, Gwang-Hee ; Yoo, Sangrok ; Park, Wonjun ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 477~485
DOI : 10.5345/JKIBC.2014.14.5.477
Standard production unit system and historical cost data are the most typical data base for calculating budget price in construction. However, these construction cost estimation methods are difficult to calculate proper construction cost because definition, additional allowance or modification criteria is not clear in construction within one day. Therefore, this study identifies problems for standard production unit system and historical cost data and suggests the improvements for them. For the objectives, this study analyzes frequency after implementing survey for 44 specialty contractors in placing at kyeonggi-province. As the results of the study, labor costs in standard production unit system and equipment costs in historical cost data and in construction of pavement and maintenance by project type was exceeded at most high rate against construction cost estimation methods. Based on this result, standard production unit system and historical cost data need to be modified by three improvements such as classification by project scale. These will be baseline data for improvement of construction cost estimation methods for less than one day workload.
Construction Application of a Newly Developed Form-Latticed Prefabricated Steel Reinforced Concrete Column
Baek, Hojin ; Lee, Seung-Hwan ; Kim, Sooyoung ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 487~495
DOI : 10.5345/JKIBC.2014.14.5.487
Shortening the construction duration of structural frame work is extremely important because the work accounts for a major percentage of all cost and duration in large projects. For this reason, new construction methods to reduce the duration of structural frame work are being continuously studied and developed. A PSRC composite column, which uses steel angles instead of H-beams, has the advantages of flexural strength and ductility. Moreover, with this PSRC technique, conventional work for reinforcing bars in columns in practice can be skipped. However, one limitation exists in which the form work is still required. This research proposes a Form-LPSRC column method that is prefabricated with the column frame that includes permanent forms attached. Feasibility was examined with mock-up specimens and finally, the technique applied to real practice. Compared to the conventional SRC column method, this study demonstrated that the proposed technique has many advantages in construction duration, cost, quality, safety and environment.
An Study on the Element Technologies of BIM and Importance Analysis of Them through Technology Development Status Analysis
Kim, Ji-Yun ; Lee, Da-Un ; Song, A-Reum ; Yun, Seok-Heon ;
Journal of the Korea Institute of Building Construction, volume 14, issue 5, 2014, Pages 497~503
DOI : 10.5345/JKIBC.2014.14.5.497
In order to facilitate the application of BIM technologies in construction projects, a lot of developed countries such as Singapore and the United States are developing a technology development road-map of BIM. In order to develop it, current status of BIM technology in domestic projects must be analyzed in advance. In this study, the element technologies of BIM was identified and the current status and the importance priorities of them were analyzed and evaluated. The result shows that the level of technology developments is behind that of other advanced countries in most of the elements. In technology importance analysis, the BIM based preliminary planning technology and the standards for BIM service contracts are ranked in the high position and their developments are also delayed in Korea. The results of this analysis could show the direction of BIM technology development and also be used for developing the technology roadmap of BIM.