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지표투과레이더와 적외선카메라를 이용한 아스팔트 포장 시공 관리 방법
백종은,박희문,유평준,임재규,Baek, Jongeun,Park, Hee Mun,Yoo, Pyung Jun,Im, Jae Kyu 한국도로학회 2015 한국도로학회논문집 Vol.17 No.6
PURPOSES : The objective of this study is to propose a quality control and quality assurance method for use during asphalt pavement construction using non-destructive methods, such as ground penetrating radar (GPR) and an infrared (IR) camera. METHODS : A 1.0 GHz air-coupled GPR system was used to measure the thickness and in situ density of asphalt concrete overlay during the placement and compaction of the asphalt layer in two test construction sections. The in situ density of the asphalt layer was estimated based on the dielectric constant of the asphalt concrete, which was measured as the ratio of the amplitude of the surface reflection of the asphalt mat to that of a metal plate. In addition, an IR camera was used to monitor the surface temperature of the asphalt mat to ensure its uniformity, for both conventional asphalt concrete and fiber-reinforced asphalt (FRA) concrete. RESULTS : From the GPR test, the measured in situ air void of the asphalt concrete overlay gradually decreased from 12.6% at placement to 8.1% after five roller passes for conventional asphalt concrete, and from 10.7% to 5.9% for the FRA concrete. The thickness of the asphalt concrete overlay was reduced from 7.0 cm to 6.0 cm for the conventional material, and from 9.2 cm to 6.4 cm for the FRA concrete. From the IR camera measurements, the temperature differences in the asphalt mat ranged from $10^{\circ}C$ to $30^{\circ}C$ in the two test sections. CONCLUSIONS : During asphalt concrete construction, GPR and IR tests can be applicable for monitoring the changes in in situ density, thickness, and temperature differences of the overlay, which are the most important factors for quality control. For easier and more reliable quality control of asphalt overlay construction, it is better to use the thickness measurement from the GPR.
화력발전소 보일러 슬링로드 하중측정 기술을 적용한 하중평형 시스템 연구
백종은(Baek Jongeun) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The main purpose of this study is to set more reliable load measurement and adjustment techniques for sling rod by complementing disadvantages of the existing load adjustment and load adjustment of sling rod for load balance of sling rod. It is hard to get the accurate data with the existing load measurement and adjustment techniques for sling rod as there are errors on measurement on supported load and a lot of man power and time are spent. Therefore, sling rod model system was fabricated and accurate method of load measurement was invented so that exact data could be acquired with the existing way and the newly invented method. According to the result of data analysis, the newly invented method that had lifted the whole headers, measured and adjusted load at the same time saved time and could get much more accurate data than existing individual load measurement and adjustment.