• 한국도로학회논문집
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• 제16권4호
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• pp.11-19
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• 2014

PURPOSES: This study is to suggest the improvement for bus rapid transit system in Seoul METHODS: The maintenance cost for bus lane damages and plastic deformations are increased by bus passing speed, heavy bus weight, and climate change (localized torrential downpour, subtropical climate) and the accident risk has been increased. RESULTS: Recent analysis of pavement damage indicates that bus lane damage caused by heavy weight is overwhelming and it is urgent to prepare countermeasures. CONCLUSIONS : Pavement data of bus rapid transit system, bus transit numbers and pavement damage elements were analyzed. By analyzing pavement maintenance, design and construction, the countermeasures for the improvement of bus lane pavement and effective maintenance were suggested.

• 한국지열·수열에너지학회논문집
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• 제19권2호
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• pp.8-19
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• 2023

Hydronic heated road pavement (HHP) systems have well studied and documented by many researchers. However, most of the systems run on asphalt, only a few are tested with concrete, and there rarely is a comparison between those two common road materials in their heating and cooling performance. The aim of this study is to investigate the thermal performance of the HHP, such as heat dissipation performance in winter season while focusing on the surface temperature of the concrete and asphalt pavement. For preliminary study a small-scale experimental system was designed and installed to evaluate the heat transfer characteristics of the HHP in the test field. The system consists of concrete and asphalt slabs made of 1 m in width, 1 m in length, and 0.25 m in height. In two slabs, circulating water piping was embedded at a depth of 0.12 m at intervals of 0.16 m. Heating performance in winter season was tested with different inlet temperatures of 25℃, 30℃, 35℃ and 40℃ during the entire measurement period. The results indicated that concrete's heating performance is better than that of asphalt, showing higher surface temperatures for the whole experiment cases. However, the surface temperature of both concrete and asphalt pavement slabs remained above 0℃ for all experimental conditions. The heat dissipation performance of concrete and asphalt pavements was analyzed, and the heat dissipation of concrete pavement was greater than that of asphalt. In addition, the higher the set temperature of the circulating water, the higher the heat dissipation. On the other hand, the concrete pavement clearly showed a decrease in heat dissipation as the circulating water set temperature decreased, but the decrease was relatively small for the asphalt pavement. Based on this experiment, it is considered that a circulating water temperature of 20℃ or less is sufficient to prevent road ice. However, this needs to be verified by further experiments or computational fluid dynamic (CFD) analysis.

• 한국도로학회논문집
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• 제9권4호
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• pp.159-169
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• 2007

본 연구에서는 효율적인 포장관리를 위해 경제성을 고려하여 생애주기비용(LCC)이 최소가 되는 시점에서 필요한 유지보수공법을 적용할 수 있는 포장관리시스템(PMS)을 개발하여 실제 포장관련 자료를 기반으로 한 유지관리방안을 제시하였다. 나아가 예산제약이 없는 경우를 대상으로 일정한 수준의 도로 서비스수준을 유지하기 위해 필요한 예산은 매년 차이가 있음도 확인하였다. Visual Basic 프로그램으로 개발하여 시스템의 응용성과 실효성의 검증을 위해 22개의 국도포장단면을 대상으로 현장조사를 시행하여 얻은 자료를 바탕으로 포장단면의 장기공용성 추정과 예산범위를 고려한 효율적인 유지관리 방안을 제시하였다.

• 한국도로학회논문집
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• 제7권4호
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• pp.173-184
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• 2005

차선의 주요성능인 차선반사도는 도로의 기하구조 특성, 차선재료, 교통량, 일기, 환경요인등 다양한 요소에 의해 영향을 받게 된다. 그 결과 차선은 영향을 받은 정도에 따라 각기 다른 반사성능을 나타내게 된다. 본 논문은 공용중인 고속도로에서 차선의 반사성능 감소가 심할 것으로 예상되는 특정 기하구조 및 시설물 구간의 차선반사도 증감의 특성을 확인하여 밝히는 데 그 목적이 있다. 이를 통해 현행 최소차선반사도 기준과 비교하여 차선 반사도의 기하구조 또는 시설물 구간에 따른 차별적 관리가 필요하다는 주장을 제시하고자 한다. 데이타 분석을 위해 중부고속도로 하남JCT-남이JCT구간에서 황색실선. 백색점선의 차선반사도를 측정하였다. 이 측정치를 도로시설물 특이사항별로 구분하고, 각 구간에 대해 진입 전, 해당 구간, 통과 후로 구분하여 각각의 차선반사도를 비교 분석하였다. 분석결과 곡선구간, 오르막구간, IC램프구간, 터널구간에서 차선반사도가 상대적으로 낮게 측정되었다. 이로써 차선반사도의 기하구조 및 시설물 구간에 따른 차별적 적용 및 관리의 필요성을 제시하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.122-123
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• 2019

Recently, road cutting works are frequently performed to repair aging underground utilities. However, the conventional road pavement cutting equipment in Korea generates a lot of noise and dust, and the development of high performance and eco-friendly equipment is required. This study classifies road cutting work and analyzes its work characteristics before improving road cutting machine. The classification and analysis results of this study will be used for the future productivity analysis and evaluation of road cutter developed.

• 한국도로학회논문집
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• 제19권5호
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• pp.59-68
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• 2017

PURPOSES : The objective of this study is to evaluate the potential risk level of road cave-ins due to subsurface cavities based on the deflection basin measured with falling weight deflectometer (FWD) tests. METHODS: Ground penetrating radar (GPR) tests were conducted to detect road cavities. Then FWD tests were conducted on 13 pavement test sections with and without a cavity. FWD deflections and a deflection ratio was used to evaluate the effect of geometry of the cavity and pavement for road cave-in potentials. RESULTS : FWD deflection of cavity sections measured at 60 cm or a closer offset distance to a loading center were 50% greater than more robust sections. The average deflection ratio of the cavity sections to robust sections were 1.78 for high risk level cavities, 1.51 for medium risk level cavities, and 1.16 for low risk level cavities. The relative remaining service life of pavement with a cavity evaluated with an surface curvature index (SCI) was 8.1% for the high level, 21.8% for the medium level, and 89.8% compared to pavement without a cavity. CONCLUSIONS : FWD tests can be applied to detect a subsurface cavity by comparing FWD deflections with and without a cavity measured at 60 cm or a closer offset distance to loading center. In addition, the relative remaining service life of cavity sections based on the SCI can used to evaluate road cave-in potentials.

• 대한토목학회논문집
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• 제37권5호
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• pp.879-890
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• 2017

기존 미국의 포장 설계법(AASHTO)과 대표적인 도로포장 유지보수 의사결정시스템인 HDM-4는 국내 실정 또는 환경에 적합하지 않아 현실적인 도로설계, 시공 및 유지관리 차원에서 국내에 적합하지 않다. 포장 수명 연장에 따른 환경비용에서도 차이가 발생할 것으로 판단되는 바, 본 연구의 주요 목표는 대한민국의 환경조건과 차종별 특성을 반영한 한국형 도로포장 설계법(KPRP) 설계 소프트웨어의 도로 공용성 해석 모델을 기반으로 활용하여 운영 및 유지보수단계에서 대표적인 세 가지 유지보수전략별 LCCC 계산을 통해 최적 대안을 선정하는 것이다. 본 연구 결과 40년 동안의 누적 탄소배출량은 대안 2의 절삭 및 덧씌우기가 누적 탄소배출량과 LCCC의 현재가치비용이 제일 적은 것으로 분석되었다. 본 연구를 통해 다양한 도로관리 유지보수 공사별 $CO_2$배출 원단위 구축이 가능하며 향후 탄소요금의 증가에 따른 도로시설별 다양한 유지관리 전략 마련에 대한 기초연구를 수행하였다는 점에 의의가 있다.

• Earthquakes and Structures
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• 제12권4호
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• pp.457-468
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• 2017

When studying the vibration of a suspension bridge based on the traffic-bridge coupled system, most researchers ignored the contribution of the pavement response. For example, the pavement was simplified as a rigid base and the deformation of pavement was ignored. However, the action of deck pavement on the vibration of vehicles or bridges should not be neglected. This study is mainly focused on establishing a new methodology fully considering the effects of bridge deck pavement, probabilistic traffic flows, and varied road roughness conditions. The bridge deck pavement was modeled as a boundless Euler-Bernoulli beam supported on the Kelvin model; the typical traffic flows were simulated by the improved Cellular Automaton (CA) traffic flow model; and the traffic-pavement-bridge coupled equations were established by combining the equations of motion of the vehicles, pavement, and bridge using the displacement and interaction force relationship at the contact locations. The numerical studies show that the proposed method can more rationally simulate the effect of the pavement on the vibrations of bridge and vehicles.

• 한국지반환경공학회 논문집
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• 제24권12호
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• pp.19-29
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• 2023

도로의 주된 문제는 표층에서부터 작용하는 하중으로 인해 시간이 지남에 따라 균열 및 침하가 발생한다. 이러한 문제를 해결하기 위한 방법 중 하나로 지오셀(Geocell)을 사용하는 것이 있는데, 지오셀은 침식 방지, 평지 및 급경사지에서의 지반 안정화, 하중지지 및 지반 보전을 위한 구조적 보강을 위해 사용될 수 있다. 본 연구에서는 국내외 지오셀을 활용한 도로포장 적용 사례를 분석하고, 현장 시험과 LFWD(Light Falling Weight Deflectometer) 장비를 이용한 지오셀이 포함된 도로 포장 공법에 따른 지지력을 분석하고 기존도로포장 공법과 지지력을 비교·분석 하고자 한다.

• 한국도로학회논문집
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• 제14권4호
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• pp.1-8
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• 2012

PURPOSES : Skid resistance on pavements plays an important role in reducing the risk of vehicle skidding on wet surface particularly. Almost 9.3 percent of traffic accidents were occurred under rainy condition and these are over-represented in terms of the severity of the crashes. Recently, unusual weather conditions referred widely as the intensified rainfalls justify the need of a systematic management of skid resistance. In this context, the study carried out the observational study on the skid resistance characteristics of different types of pavement with the time passage. METHODS : This study measured the skid resistance with Pavement Friction Tester at three times within five years. The skid resistance measurement has followed the method suggested by ASTM. RESULTS : As the main results under the scope of this study, skid resistance of asphalt concrete has not nearly reduced with time. On the contrary, skid resistance of cement concrete has been rapidly reduced with time though the highest resistance was gained at the early observation. Porous asphalt concrete shows a steady decrease of skid resistance with time, anyway, the reduction rate according to the increase of measurement speeds is relatively lower than the others. CONCLUSIONS : Based on our study, skid resistance of the pavement should be regarded as one of the pavement management system, so periodic measurement should be made to assure road safety as a whole.