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LiDAR 스캐닝과 3D 프린팅 기술을 이용한 아스팔트 콘크리트 포장 균열 및 포트홀 유지보수
반민담,윤재형,응웬쯔엉아잉,박대욱 한국도로학회 2024 한국도로학회 학술대회 발표논문 초록집 Vol.2024 No.03
In the contemporary era, 3D printing technology has become widely utilized across diverse fields, including biomedicine, industrial design, manufacturing, food processing, aerospace, and construction engineering. The inherent advantages of automation, precision, and speed associated with 3D printing have progressively led to its incorporation into road engineering. Asphalt, a temperature-responsive material that softens at high temperatures and solidifies as it cools, presents distinctive challenges and opportunities in this context. For the effective implementation of 3D printing technology in road engineering, 3D printed asphalt (3DPA) must exhibit favorable performance and printability. This requires attributes such as good fluidity, extrudability, and buildability. Furthermore, materials utilizing 3DPA for crack repair should possess high viscosity, elasticity, toughness, superior high-temperature stability, and resistance to low-temperature cracking. These characteristics ultimately contribute to enhancing pavement longevity and ensuring worker safety.
아스팔트 포장의 부피 특성이 간접인장강도 및 피로균열 지수에 미치는 영향분석
이수형,반민담,LAM MY PHUNG,박대욱 한국도로학회 2022 한국도로학회논문집 Vol.24 No.6
PURPOSES : The aim of this study is to evaluate the effects of air voids, binder content, and aggregate gradation on the indirect tensile strength (IDT) and cracking tolerance index (CTindex) of cored asphalt pavements. METHODS : Cored samples were obtained from roads in Incheon city, and several laboratory experiments were performed. First, the cored samples were first to cut into a size appropriate for the IDT test. Subsequently, the air voids of the samples were measured. The damaged sample from the IDT test was loose mixed at 150 ℃ before the binder content was determined, which was conducted via an asphalt extraction test. Finally, the clean aggregates obtained from asphalt extraction process were analyzed in the aggregate gradation test. RESULTS : The result shows that an increase in air voids from 4% to 8% decreases the IDT and cracking tolerance index (CTindex) by 30% and 28%, respectively. Incorporating a binder enhances the ductile behavior of the asphalt mixture, resulting in a higher CTindex. Finally, the contribution of the aggregate grade on the IDT and CTindex is negligible. CONCLUSIONS : The IDT and CTindex are primarily affected by the air voids and binder content. A higher percentage of air voids results in a lower IDT. In addition, a higher amount of binder increases the IDT and CTindex of the cored samples. Meanwhile, the aggregate grade does not affect the IDT.
함부르크휠 시험과 이미지 분석을 통한 비드코트 탈리 저항성 평가
김연태,NGUYENTRUONGANH,반민담,박대욱 한국도로학회 2022 한국도로학회논문집 Vol.24 No.6
PURPOSES : The aim of this study is to evaluate the stripping resistance of a bead coating via the Hamburg wheel tracking test and image analysis. METHODS : First, the stripping resistance of the bead coating was evaluated via the Hamburg wheel tracking test. A pneumatic wheel with a load of 175±2 N was used to simulate repeated skid cycles. Several bead coating mixtures with different numbers of coating layers, i.e., zero, one, two, three, and four layers, i.e., zero, one, two, three, and four layers,were conducted. Finally, an image analysis program was developed to analyze surface images captured from the Hamburg wheel tracking test. RESULTS : The results show that the samples with more coating layers exhibit higher stripping resistance. After 500 stripping cycles, the percentage of bead loss is 4% to 28%. At 80% bead loss, the mixture with one coating layer presents more skid cycles than the control sample without a coating layer. CONCLUSIONS : Incorporating a coating layer can improve the stripping resistance of glass beads under repeated skid cycles. Additionally, an image analysis program is established in this study to determine the percentage of bead loss caused by the stripping test.
마이크로파 가열을 이용한 아스팔트 혼합물의 균열치유 평가
이호민트리,박대욱,반민담 한국도로학회 2017 한국도로학회 학술대회 발표논문 초록집 Vol.2017 No.10
This study evaluates the healing performance of asphaltmixture via microwaves heating method. Three different conductive additive types with various percentages were used, includingsteel wool fibers (SF), carbon fibers (CF), and graphite (G). The healing performance of asphalt mixture wasinvestigated through 10 damage-heal cycles of semi-circular samples using three-point bending test. The infraredcamera was also employed to recordthe heat transmitting in the test samples. The test results indicated that the healing effectiveness reduced after every healing cycles. It was found that microwave radiation provided great healing performance for almost all test samples. Among all types of conductive additives, SF mixtures achieved the highest healing performance with the healing level of higher than 50 percent after 10 cycles. However, microwaves heating may promote the faster aging of asphalt binder at late cycles which lead to the brittle behavior of samples. Finally, homogenous mixing is a critical factor to avoid the cluster formation of conductive additives which causes the overheating of asphalt binder.