• 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.

• 한국농공학회논문집
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• 제61권3호
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• pp.43-53
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• 2019

It is well-known fact that the stone-mastic asphalt (SMA) mixture has shown superior rut resistance, compared with the dense-graded asphalt (DGA) mixture in highway pavements. However, the SMA is measured to be inferior to DGA mixes when tested by well-known high-temperature test methods, such as the wheel tracking (WT), asphalt pavement analyzer, the Marshall Stability and Kim Test. Therefore, this study examined the reasons why it was measured to be inferior, and devised a potential procedure by which the superiority of SMA could be measured at $60^{\circ}C$. The strength against deformation ($S_D$), which was known to show very high correlation with WT results for DGA mixes, was measured by the Kim Test on the specimen confined in the compacted mold. In standard Kim Test, which used the specimen without confinement, the DGA was measured to show higher $S_D$ than the SMA. But by confining specimen, it was found that the $S_D$ of SMA was measured to be higher than that of DGA. Therefore, the confined static test protocol devised in this study was found to be feasible for evaluating rut resistance of SMA mix.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.299-304
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• 2003

In this research, eight waterproofing membranes were selected from commercial market and the tensile adhesive characteristics of the waterproofing system (WPS) on concrete bridge deck were investigated in view of various factor in asphalt pavement. Tensile adhesive strength (TAS) test of different asphalt pavement types showed that TAS of WPS under SMA (Stone Mastic Asphalt) pavement was greater than that under dense asphalt pavement. Tensile adhesive strength (TAS) of sheet membranes was improved as the compaction temperature of asphalt concrete increase, but TAS of liquid membranes were not. TAS of sheet membranes after wheel tracking test were in the order of the sites under wheel path (UWP), before wheel tracking (BWT) and nearby wheel path (NWP), Since TAS of the same WPS of UWP was higher than TAS of BWT, wheel loading had function of pressing WPS resulting in higher adhesive strength, But liquid membranes were variable on types, The feature of detached interface after T AS test showed that sheet types were all detached in between deck concrete and WPS, and liquid types were detached in between asphalt pavement and WPS,

• 한국도로학회논문집
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• 제11권4호
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• pp.25-31
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• 2009

SMA 혼합물은 소성변형 저항성이 매우 큰 혼합물로 알려져있다. 하지만 실내 시험에서는 이를 측정할 수 있는 시험법이 아직 미흡한 실정이다. 따라서 본 연구의 목적은 소성변형에 대하여 높은 저항성을 가지는 SMA 혼합물의 변형강도치와 반복주행시험과의 상관성 분석을 통하여 SMA에 변형강도의 적용성을 고찰하는 것이다. 이를 위해 SMA 혼합물의 배합설계를 거쳐 최적 아스팔트함량의 혼합물에 대하여 변형강도 시험과 반복주행 시험을 수행하였다. 연구결과, 변형강도는 SMA 혼합물의 소성변형 특성을 보이기에는 매우 낮은 수준을 나타냈다. 따라서 김테스트에 의한 변형강도는 간접인장강도나 마샬 안정도와 마찬가지로 SMA 혼합물의 소성변형 저항성을 제대로 반영되지 못하는 것을 확인하였다. 또한 반복주행시험의 결과인 동적안정도나 최종침하깊이도 역시 SMA 혼합물의 소성변형 저항성을 평가하는데 문제가 있는 것으로 나타났다.

• 한국재난정보학회 논문집
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• 제7권2호
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• pp.87-95
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• 2011

노면의 미끄럼 저항성은 교통안전과 직결되는 도로 포장의 중요한 특성이다. 특히 우천 시 차량의 미끄러짐에 의한 교통사고를 줄이기 위해서는 도로의 성능 평가 시 반드시 고려해야 할 사항이다. 또한 자동차의 성능이 개선되고 운전자의 연령이 상대적으로 낮아짐으로써 고속주행을 하거나 급제동을 하는 운전 행태가 증가함에 따라 포장의 미끄럼저항성 역시 개선할 필요성이 더욱 증가하게 되었다. 그러므로 교통사고를 줄이기 위해서는 노면의 미끄럼저항성 시험을 통해 포장의 품질을 검증하고 또 향상시켜야 한다. 본 연구에서는 미끄럼 포장의 품질을 검증하기 위한 방법으로 휴대용 미끄럼저항 시험기 및 자동식 미끄럼저항 측정 장비의 측정원리를 분석하여 실제 포장변에 대하여 미끄럼 저항성을 평가하도록 하였다. 일반 밀입도 포장, 배수성 포장, SMA 포장에 실시한 미끄럼 저항성 평가는 배수성 포장과 SMA 포장의 노후화에 따라 일반 밀입도 포장의 미끄럼 저항성이 가장 크게 나타났다.

• 한국도로학회논문집
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• 제17권3호
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• pp.69-76
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• 2015

PURPOSES : Performance evaluation of four types of asphalt concrete overlays for deteriorated national highways. METHODS : Pavement distress surveys for crack rate and rut depth have been conducted annually using an automated pavement survey vehicle since 2007. Linear and non-linear performance prediction models of the asphalt concrete overlays were developed for 43 sections. The service life of the asphalt overlays was defined as the number of years after which a crack rate of 30% or rut depth of 15mm is observed. RESULTS : The service life of the asphalt overlays was estimated as 17.4 years on an average. In 90.7% of the sections, the service life of the overlays was 15 years or more which is 1.5 times the life of conventional asphalt concrete overlays used in national highways. The performance of the overlays was dependent on the type of asphalt mixture, traffic volume levels, and environmental conditions. CONCLUSIONS : The usage of stone mastic asphalt (SMA) and polymer-modified asphalt (PMA) for the overlays provided good resistance to cracking and rutting development. It is recommended that appropriate asphalt concrete overlays must be applied depending on the type of existing pavement distress.

• 한국도로학회논문집
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• 제14권3호
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• pp.9-14
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• 2012

본 논문에서는 경량 프로파일러를 이용한 프로파일을 측정하여 매크로 텍스쳐 크기를 산정하고 분석하였다. 밀입도, 배수성, SMA, 기층 포장에 대한 프로파일을 측정하여 포장에 사용된 골재에 의한 매크로 텍스쳐 크기를 분석하였으며, 재료분리가 일어난 지역의 프로파일을 측정하여 매크로 텍스쳐 깊이를 분석하였다. 본 연구 결과 프로파일 분석을 통하여 효과적으로 매크로 텍스쳐 크기를 산정할 수 있었으며, 아스팔트 혼합물 종류별로 텍스쳐 크기를 분석할 수 있었다. 또한, 매크로 텍스쳐 크기를 산정하여 분석함으로써 재료분리가 일어난 지역을 탐지할 수 있었다.

• 한국도로학회논문집
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• 제20권4호
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• pp.7-13
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• 2018

PURPOSES : In order to apply high-speed weigh-in-motion (HS WIM) systems to asphalt pavement, three high-durability asphalt concrete mixtures installed with a WIM epoxy are evaluated. METHODS : In this study, dynamic stability, number of loading repetitions to reach the rut depth of 1 mm, and rut depth measurements of three asphalt mixtures at $60^{\circ}C$ were compared using an Asphalt Pavement Analyzer (APA). Laboratory-fabricated material and field core samples were prepared and tested according to KS F2374. RESULTS : Through the laboratory tests, it was found that all three modified asphalt mixtures (stone-mastic, porous, and semi-rigid) with WIM epoxy showed favorable permanent deformation results and passed the dynamic stability criterion of 3000 loading repetitions per 1 mm. In addition, it was confirmed that the modified SMA mixtures cored from the field construction yields satisfactory rutting testing results using the APA. Finally, the epoxy used for the HS WIM installation shows good adhesion with the three asphalt mixtures and permanent deformation resistance.

• 한국도로학회논문집
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• 제17권1호
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• pp.25-33
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• 2015

PURPOSES : This paper, presents the results of a laboratory study aimed to verify the suitability of a particular type of Electric Arc Furnace (EAF) steel slag to be recycled in the lithic skeleton of both dense graded and porous asphalt mixtures for flexible pavements. METHODS : Cyclic creep and stiffness modulus tests were performed to evaluate the mechanical performance of three different asphalt mixtures (dense graded, porous asphalt, and stone mastic) prepared with two types of EAF steel slag. For comparison purposes, the same three mixtures were also designed with conventional aggregates (basalt and limestone). RESULTS : All the asphalt mixtures prepared with EAF steel slag satisfied the current requirements of the European standards, which support EAF steel slag as a suitable material for flexible pavement construction. CONCLUSIONS : Based on the experimental work, the use of waste material obtained from steel production (e.g. EAF steel slag) as an alternative in the lithic skeleton of asphalt mixtures can be a satisfactory and reasonable choice that fulfills the "Zero Waste" objective that many iron and steel industries have pursued in the past decades.

• 한국도로학회논문집
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• 제4권3호
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• pp.25-33
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• 2002

국가 기간산업의 중추 역할을 수행하는 일반 국도는 대부분 일반 아스팔트 포장으로 되어 있으며, 최근 들어 고온 및 중차량의 증대로 인해 포장의 수명이 급격히 줄어들고 있는 실정이다. 이런 이유로 많은 경우 신설포장에 대해서는 SMA. 개질아스팔트 등 특수포장이 적용되고 있다. 그러나 어떤 경우에 특수 포장을 채택할 것인가에 대한 적용 기준이 명확히 제시되어 있지 않아 설계 실무자들이 포장형식 선정을 위한 의사 결정에 많은 어려움이 있다. 본 연구에서는 이에 대한 부분적인 해결책으로 과거 10여 년 동안 수행된 국도 포장유지관리시스템의 자료를 이용하여 교통량에 따른 일반 아스팔트포장의 수명을 분석하였다. 분석결과 신설포장은 9.5년, 덧씌우기 포장은 5.6년으로 나타났다. 또한 현재의 포장 수명에 대한 분포 자료를 이용하여 설계 수명인 10년을 공용하기 위한 교통량을 신뢰수준에 따라 제시하였다. 그 결과 90%의 신뢰수준에서는 8.2ton 표준 축하중 2,300 ESAL, 80% 신뢰수준에서는 8.2ton 표준 축하중 1,500 ESAL로 나타났다 즉, 여기서 제시된 교통량보다 많은 구간에 대해서는 특수 포장의 적용을 검토할 것을 제안한다.