• 한국농공학회지
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• 제34권1호
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• pp.66-77
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• 1992

A prototype probabilistic approach to thickness design for asphalt pavement surface course was developed using first-order second moment probability model. The tensile strain (load effect) developing at the bottom of surface layer due to the wheel load and the critical strain (resistance) of asphalt concrete were used as random variables for pavement reliability analysis. Based on the parameters for load effect and resistance data collected from reference and field, simulated data were generated by Monte Carlo method for reliability evaluation of the pavement for a typical rural highway. Thickness of pavement surface course was defined in terms of target reliability of the pavement, growth factor of traffic, design life of pavement and resistance of the asphalt concrete to be placed on the pavement. According to these rationales, prototype thickness design chrats were sugested through example studies. From these, similar design charts can be developed for many pavements if appropriate data and target reliability are determined.

• 한국도로학회논문집
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• 제16권2호
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• pp.1-9
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• 2014

PURPOSES : This study aims to evaluate the performance of interlocking block pavement system for low speed highway. METHODS : Through on-site monitoring, environmental impact assessment of interlocking block pavement such as heat island reduction, traffic safety, noise pollution were evaluated as compared with asphalt pavement. Also the pavement condition and roughness were evaluated according to performance period. RESULTS : Surface temperature of interlocking block pavement was about 7 degree lower than asphalt pavement in midsummer. Compared to asphalt pavement, vehicle speed reduction effect of interlocking block pavement was about 2kph. For low speed driving, the noise pollution was measured at a similar level for both asphalt and interlocking block pavement. After 42month service period, the breakage of block was only 0.24% for the whole surveyed area. IRI of interlock block pavement was estimated within the range of 5~8m/km. CONCLUSIONS : Depending on the performance monitoring results such as heat island reduction, providing traffic safety and keeping a good pavement condition for a long service period, it assures that interlocking block pavement was applicable for low speed road.

• 한국도로학회논문집
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• 제18권1호
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• pp.91-97
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• 2016

PURPOSES : The objective of this paper is to develop a pavement performance model based on the Bayesian algorithm, and compare the measured and predicted performance data. METHODS : In this paper, several pavement types such as SMA (stone mastic asphalt), PSMA (polymer-modified stone mastic asphalt), PMA (polymer-modified asphalt), SBS (styrene-butadiene-styrene) modified asphalt, and DGA (dense-graded asphalt) are modeled in terms of the performance evaluation of pavement structures, using the Bayesian algorithm. RESULTS : From case studies related to the performance model development, the statistical parameters of the mean value and standard deviation can be obtained through the Bayesian algorithm, using the initial performance data of two different pavement cases. Furthermore, an accurate performance model can be developed, based on the comparison between the measured and predicted performance data. CONCLUSIONS : Based on the results of the case studies, it is concluded that the determined coefficients of the nonlinear performance models can be used to accurately predict the long-term performance behaviors of DGA and modified asphalt concrete pavements. In addition, the developed models were evaluated through comparison studies between the initial measurement and prediction data, as well as between the final measurement and prediction data. In the model development, the initial measured data were used.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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• pp.338-340
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• 2009

The asphalt pavement is usually non-uniform since achieving a non-segregated and homogeneous asphalt mixture is very difficult. The segregation can occur in the mixed material before it is fed onto the road and it become segregated as it is being placed onto the road surface. Note that this segregation determines the performance of the asphalt pavement. Hence, it is necessary to check the segregation by estimating the density of the asphalt pavement in the field. In this paper, a research on estimating the density of the asphalt mixture by measuring the dielectric constant of the material is conducted. An RF transceiver and an antenna are designed and tested to a series of asphalt density samples, and discussions are shown.

• 한국도로학회논문집
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• 제17권1호
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• pp.1-6
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• 2015

PURPOSES : Recently, attempts have been made to evaluate tire-pavement noise based on a measure of Mean Profile Depth (MPD). However, equivalent values of MPD appear to correspond to different levels of tire-pavement noise, which indicates that other factors such as texture wavelength need to be included to improve the accuracy of noise prediction. A single index to represent texture wavelength is proposed in this study. A consistent relationship between tire-pavement noise and texture wavelength on asphalt concrete pavement is observed. METHODS : Profile data and tire-pavement noise data were collected from a number of expressway sections in Korea. In addition, texture wavelength was defined by a Peak Number (PN), which was calculated using profile data. Statistical analysis was performed to find the relationship between the PN and tire-pavement noise. RESULTS : As a result of this study, a linear relationship between PN and tire-pavement noise is observed on asphalt concrete pavement. CONCLUSIONS : Tire-pavement noise on asphalt concrete pavement can be predicted from PN information.

• 한국도로학회논문집
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• 제12권4호
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• pp.53-60
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• 2010

섬유보강 아스팔트 포장은 신설뿐만 아니라 유지보수를 위한 덧씌우기에도 적용 가능한 포장 유형이다. 섬유보강재를 아스팔트 층 사이에 설치하여 하부 층에 이미 발생된 균열을 정지시키거나 지연시키고 러팅을 저감할 수 있다. 본 연구에서는 섬유보강 아스팔트 포장과 일반 또는 개질 아스팔트 포장의 공용성을 비교하기 위하여 균열율, 러팅, 종단평탄성, 그리고 처짐을 조사하였다. 현장조건에 근거하여 11개 구간을 비교에 적합한 구간, 비교에 제약이 있는 구간, 그리고 비교가 곤란한 구간의 세 가지 그룹으로 나누어 조사하였으며 측정된 자료는 통계적으로 분석되었다. 섬유보강 아스팔트 포장은 일반 또는 개질 아스팔트 포장에 비해 러팅 저항성이 크고 종단평탄성이 증진되는 효과가 있었다. 하지만, 처짐은 유사했으며 조사된 구간의 공용기간이 짧아 균열에 대한 저항성은 비교할 수 없었다.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.357-360
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• 2007

Water retaining pavement is a pavement to lower the surface temperature by using evaporation of the water that the pavement contains when the pavement is heated by the sun in the daytime. The objective of this study is to develop water retaining materials. In this study we evaluated the practical application of a sepiolite and a charcoal as a water retaining material. We produced dense grade asphalt pavement, porous asphalt pavement, semi-rigid Pavement, semi-rigid pavement included a charcoal and semi-rigid pavement included a sepiolite, and then tested surface temperature characteristics. The test result says that water retaining pavements using a sepiolite and a charcoal lower surface temperature more than $10^{\circ}C$ compared to dense grade asphalt pavement. We confirm the practical application of a sepiolite and a charcoal as a water retaining material according to the test results.

• 한국도로학회논문집
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• 제20권3호
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• pp.47-57
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• 2018

PURPOSES : The permeable pavement type has been rapidly developed for solving problems regarding traffic noise in the area of housing complex and heavy rainwater drainage in order to account for the climate change. In this regards, the objective of this study is to figure out the characteristics of pavement types. METHODS : The laboratory test for deriving optimum asphalt content (OAC) was conducted using the mixtures of the permeable asphalt surface for the pavement surface from Marshall compaction method. Based on its results, the pavement construction at the test field was conducted. After that, the site performance tests for measuring the traffic noise, strength and permeability were carried out for the relative evaluation in 2 months after the traffic opening. The specific site tests are noble close proximity method (NCPX), Light falling deflectometer test (LFWD) and the compact permeability test. RESULTS : The ordered highest values of the traffic noise level can be found such as normal dense graded asphalt, drainage and porous structure types. In the results from LFWD, the strength values of the porous and drainage asphalt types had been lower, but the strength of normal asphalt structure had relatively stayed high. CONCLUSIONS :The porous structure has been shown to perform significantly better in permeability and noise reduction than others. In addition to this study, the evaluation of the properties and the determination of the optimum thickness for the subgrade course under the porous pavement will be conducted using ground investigation technique in the further research.

• 한국방재학회 논문집
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• 제9권1호
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• pp.21-25
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• 2009

본 논문에서는 텍사스 휴스턴에 소재하는 William P Hobby공항의 아스팔트 덧씌우기 포장두께를 설계하기위한 재료 특성화와 구조평가 연구결과에 관한 최근의 사례결과를 나타내고 있다. Hobby 공항의 12R-30L 활주로는 포틀랜드시멘트 콘크리트 포장위에 두꺼운 아스팔트 덧씌우기 층으로 구성되어 있으며 최근 부분적인 표면 밀림 현상이 관측되었다. 아스팔트 혼합물 현장코아 시료를 사용하여 표면 밀림현상 원인을 분석하기 위하여 공기량, 아스팔트 함량 및 골재 입도 분석이 수행되었다. 미연방 항공우주국의 탄성층 해석 프로그램인 LEDFAA가 새로운 아스팔트 덧씌우기층의 포장구조 상태를 평가하기 위하여 사용되었다. 이를 위하여 두 가지의 포장구성 상태가 존재한다고 가정하였다. 즉 PCC 포장위에 아스팔트 콘크리트 덧씌우기층, 그리고 아스팔트 콘크리트 포장. 실험실 시험결과를 근거로 아스팔트 바인더 함유량에 대한 200번째 체 통과 골재비는 $1.1{\sim}2.2$이며 비율이 높을수록 혼합물은 연성을 보이는 것으로 나타났다. 따라서, 12R-30L 활주로의 표면밀림 현상은 과도한 세립골재 함유율로 인한 연성혼합물이 원인인 것으로 나타났다. 구조 평가결과에 의하면 아스팔트 포장으로 포장구조를 가정한 해석 결과는 PCC층에 비하여 좀 더 두꺼운 아스팔트 층일때 더 실질적인 구조적 수명을 나타내었다. 아스팔트층 하부의 PCC포장은 고급기층재료 역할을 수행하기 때문인 것으로 해석된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.552-561
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• 2006

The purpose of this study is to propose a pavement analysis system which considers dynamic effects resulted from the various vehicle speeds. Vehicle loading effects were estimated by loading frequency and dynamic loads under various vehicle speeds. In addition, a proposed analysis model takes the non-linear temperature using a predictive model for dynamic modulus in asphalt layer and the non-linear stress in the unbound material. To examine adequacy of existing multi-layer elastic analysis of non-linear temperature in asphalt layer and non-linear stress conditions in unbound material, this study divided layers of asphalt pavement structures with 10 layers in asphalt, 2 layers in subbase and 1 layer in subgrade. In order to verify the pavement analysis system that considers various speeds, deflections of pavement calculated using ABAQUS, a three dimensional finite element program, were compared with the results of field tests under various speeds.