• Title/Summary/Keyword: 배수성 포장

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Laboratory and Field Performance Evaluation of Acryl Resin Based Solar Radiation Reflective Pavement (아크릴 수지를 이용한 차열성 포장의 실내 및 현장 공용성 평가)

  • So, Kyung-Rock;Lee, Hyun-Jong;Baek, Jong-Eun;Lee, Sang-Yum
    • International Journal of Highway Engineering
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    • v.13 no.4
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    • pp.19-28
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    • 2011
  • This study developed a solar radiation reflection pavement, so called a cool pavement, to lessen the urban heat island effect by coating a pavement surface with acrylic resins mixed with light-colored pigments. From a laboratory test, simulating solar heating process in pavements, the cool pavement reduced more than $12^{\circ}C$ of pavement temperature at $60^{\circ}C$ compared to a control porous pavement. With the increase of the mixing ratio of the pigments to acrylic resins, the temperature reduction effect increased, but its workability became worse due to higher viscosity. As a result, an appropriate mixing ratio was determined as 15%. The cool pavement had better durability than the control pavement: One quarter of Catabro loss and twofold dynamic stability. Its adhesion was also higher enough not to be debonded under traffic loading. In-situ noise and friction tests conducted in two field sites showed that the cool pavement reduced its noise level by 3.7dB in average and increased its friction level by 30% compared to the control pavement. The permeability of the cool pavement was little lower than the control pavement, but higher enough to satisfy the minimum requirement for porous pavements.

An Evaluation of Resistances in Porous Asphalt Concrete Mixtures due to Repeated Cyclic Freeze-Thawing (배수성 아스팔트콘크리트 혼합물의 반복 동결융해 저항성 평가)

  • Jo, Shin Haeng;Kim, Nakseok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.1D
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    • pp.33-39
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    • 2012
  • More and more pavements are suffering from damage these days due to the below-zero winter temperatures and frequent snowfalls. From this research, the freeze-thawing mechanisms of pavements will be observed, and the freeze-thawing resistance of porous asphalt concrete mixture is to be evaluated according to various assessment methods. The investigation was conducted through applying rigid and flexible pavements to freeze-thawing resistance experiments, which include various experiments such as deformation rate measurements, Lottman tests, repeated cyclic freeze-thawing experiments, stripping resistance tests and so on. Test results revealed that the porous asphalt concrete had less deformations according to temperatures compared to dense-graded asphalt concrete due to the 20% void gap. In addition, according to the freeze-thawing repetition experiments which are effected by moisture, the porous asphalt concrete mixture showed superior resistance to repeated cyclic freeze-thawing compared to other asphalt concrete mixtures due to the drainage and the voids within the specimen.

An Evaluation of Skid Resistance Properties of Asphalt Concrete Pavement (아스팔트콘크리트 포장의 노면 미끄럼 저항성 평가)

  • Kim, Nakseok;Jeong, Haesoo
    • Journal of the Society of Disaster Information
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    • v.7 no.2
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    • pp.87-95
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    • 2011
  • The skid resistant of pavement surface is an important parameter since it is directly related to the traffic safety under moving vehicular loads. In particular, it should be considered as a major factor in pavement performance evaluations to reduce the traffic accident from vehicular sliding. In this study, a portable and an automatic skid resistance tests were used to evaluate the skid resistances of the in-situ pavements. The test results showed that the skid resistance of the conventional dense graded pavement was more noticeable than the other pavement types such as the drainage pavement and the stone mastic asphalt(SMA) pavement as the service life of pavement was increased.

Evaluation of the Temperature Drop Effect and the Rutting Resistance of Moisture Retaining-Porous Asphalt Pavement Using Accelerated Pavement Testing (포장가속시험을 이용한 보수형 배수성 포장의 온도저감 효과 및 소성변형 저항특성 연구)

  • Kwak, Byoung-Seok;Suh, Young-Chan;Song, Chul-Young;Kim, Ju-Won
    • International Journal of Highway Engineering
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    • v.11 no.3
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    • pp.97-109
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    • 2009
  • One of the main causes of asphalt rutting is high temperature of the pavement. Nevertheless, there has been few research on lowering the pavement temperature for reducing rutting. This study investigated the performance characteristics of moisture-retaining porous asphalt pavement, which is known to have a temperature reducing effect. The purpose of this study is to quantify the temperature reducing effect of moisture-retaining porous asphalt pavement and its effect of reducing rutting through Accelerated Pavement Testing(APT). Additionally, the possibility of reducing the thickness of the pavement in comparison to general dense grade pavement by analyzing structural layer coefficient of moisture retaining pavement. A total of three test sections consisting of two moisture-retaining porous asphalt pavement sections and one general dense-grade porous asphalt pavement section were constructed for this study. Heating and spraying of water were carried out in a regular cycle. The loading condition was 8.2 ton of wheel load, the tire pressure of $7.03kgf/cm^2$, and the contact area of $610cm^2$. The result of this experiment revealed that the temperature reducing effect of the pavement was about $6.6{\sim}7.9^{\circ}C$(average of $7.4^{\circ}C$) for the middle layer and $7.9{\sim}9.8^{\circ}C$(average of $8.8^{\circ}C$) for surface course, resulting in a rutting reduction of 26% at the pavement surface. Additionally, the structural layer coefficient of moisture retaining pavement measured from a laboratory test was 0.173, about 1.2 times that of general dense grade pavement. The general dense-grade porous asphalt pavement test section exhibited rutting at all layers of surface course, middle layer, and base layer, while the test sections of moisture-retaining porous asphalt pavement manifested rutting mostly at surface course only.

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An Experimental Study of Permeable Concrete Pavement for Application (투수성 콘크리트포장의 실용화를 위한 실험적 연구)

  • 문한영;김성수;정호섭
    • Magazine of the Korea Concrete Institute
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    • v.10 no.3
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    • pp.165-173
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    • 1998
  • 투수성 콘크리트포장은 우천시 도로포장 노면의 배수, 차량 주행 안전성의 향상 및 소음의 저감등을 목적으로 개발된 포장이지만 주행환경 및 도로주변과의 환경조화에도 기여한다. 일반적인 배수성 아스팔트 콘크리트포장에서는 투수계수 1$\times$10-2cm/sec를 목표로 정하고 있으나 본 연구에서는 투수성 콘크리트포장의 실용화를 위한 연구의 일환으로 투수계수1$\times$10-1cm/sec를 목표로 정하여 골재의 최대치수, 잔골재율 및 단위시멘트량을 변화시킨 투수성 콘크리트의 공극률, 연속공극률 및 투수계수와 제강도를 측정한 결과에 대하여 고찰하였다. 투수성 콘크리트의 목표투수계수 1$\times$10-1cm/sec 일 때 공극률 및 연속공극률은 각각 15 %와 12%정도이며, 압축강도는 240kg/$\textrm{cm}^2$정도의값을 나타내었으며, 골재의 최대치수가 10~13mm일 경우, 잔골재율 10~20%, 단위시멘트량 380 kg/$\textrm{cm}^2$정도가 적절한 배합으로 생각된다.

Development of a Drainage System to Mitigate Moisture Damage for Bridge Deck Pavements (교면포장의 수분손상 저감을 위한 체류수 배수공법 개발)

  • Lee, Hyun-Jong;Kim, Hyung-Bae;Seo, Jae-Woon
    • International Journal of Highway Engineering
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    • v.9 no.2 s.32
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    • pp.129-140
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    • 2007
  • A major purpose of this study is to develop a drainage system that can quickly drain water penetrated into pavement layers to mitigate pot holes which is one of the major distress types in bridge deck pavements. This system can be established by applying a thin drainage layer between waterproof and pavement layers. The most important elements for this system are the performance of waterproof layer and construction technique for the thin drainage layer. The porous asphalt mix with the maximum aggregate size of 10mm is first developed based on the porous asphalt mix design guide proposed by NCAT, and various physical and mechanical tests are performed to confirm that the porous mix satisfies all the specification requirements. In addition, a series of laboratory tests including low-temperature bending and bonding strength tests for the MMA(Methyl Methacrylate) type of waterproofing material. It is observed from the tests that the MMA material satisfies all the specification requirements. To evaluate the Reld performance of the drainage system, a field study has been conducted on a relatively small size bridge. The QC/QA tests are conducted on the both waterproofing and pavement materials. It has been found that the drainage system works well to drain the water penetrated into the pavement layers.

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A Study on Noise Reduction of Quiet Pavement through the Noise Level Prediction and the Economic Analysis (저소음 포장의 소음예측 및 경제성 분석을 통한 소음 저감방안)

  • Jo, Shin Haeng;Jang, Jung Soon;Kim, Wan Sang;Kim, Nakseok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.3
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    • pp.1143-1151
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    • 2013
  • Reasonable methods are needed to predict the noise level of new/existing roads and to select means of noise reduction. In this study, the noise reduction effects of both soundproof walls and quiet pavements were predicted. The noise reduction effects of quiet pavements were predicted by measurement data obtained using the CPX method in test pavements. The noise reduction effect was predicted by KHTN program when applied to soundproof walls and quiet pavement. As a result, the predicted noise level was similar to the measured one. The design method was suggested by an economic analysis using noise benefit of predicted noise reduction. The research suggests that the optimum alternative has to be determined using noise prediction method and life-cycle cost analysis.

Evaluation of Characteristics of Tack Coat for Porous Pavement using Direct Shear Test (직접 전단 실험을 통한 배수성포장용 택코트 특성 평가)

  • Kim, Nak-Seok;Hong, Eun-Cheol;Jo, Shin-Haeng
    • Journal of the Korean Society of Hazard Mitigation
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    • v.9 no.1
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    • pp.27-32
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    • 2009
  • The main objective of this study is to develop a test for measuring the bond shear strength between pavement layers. The research is also conducted to evaluate tack coat materials and application rate in porous pavement. The experiment includes using two types of emulsions (RSC-4, Modified Emulsion) and a asphalt binder type (HM-1). HM-1 was developed to be applied in porous pavement. The bond shear strengths were measured by a direct shear type device under various test conditions. The shear strength may not be appropriate in the evaluation of the bond shear strength, while the toughness of the test may be useful. In case of the tack coat application rate in porous pavement, RSC-4 has to be used a minimum amount of $0.8l/m^2$ and modified emulsion asphalt has to be applied a volume of use $0.5{\sim}0.6l/m^2$. HM-1, asphalt cement type, is far stronger bond shear strength than emulsified asphalt tack coat and had showed the excellent trackless property.

Noise reduction of Asphalt Concrete Pavement : Techniques and their performance evaluation (아스팔트 저소음 포장의 개발 및 공용성 평가)

  • Ock, Chang-Kwon;Kim, Jin-Hwan;Lee, Jong-Sup
    • International Journal of Highway Engineering
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    • v.12 no.1
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    • pp.29-37
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    • 2010
  • Porous pavements can provide road users with beneficial characteristics such as skid resistance and surface water drainage under rainy condition, and they cause less tire-road noise than conventional hot mix asphalt(HMA) pavements. However, voids of porous pavements are easily clogged by road debris at early stages, which leads to frequent maintenance works. Therefore, this study focused on the way of minimizing void clogging in porous pavements. During mixture design, the quantity of coarse aggregate has been increased to form many straight void conduits (SVCs) in porous HMAs. These SVCs were found to be effective resisting the void clogging problems. Four different porous HMAs(19mm, 13mm, 10mm, and 8mm) were developed and placed on highway roads. Their performances were validated with field tests during the past four years.

Study on the Functional Evaluation of Permeable Asphalt Concrete Pavement in Seoul City (서울시 배수성 아스팔트 포장의 기능적 평가 연구)

  • Lee, Sang-Yum;Kim, In-Tae;Mun, Sung-Ho;Kwon, Soo-Ahn
    • International Journal of Highway Engineering
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    • v.14 no.3
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    • pp.33-39
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    • 2012
  • The functional evaluation of constructed permeable pavements was conducted in terms of water permeable performance and noise reduction measurements in Seoul city. The field measurements of noise was based on two methods such as pass-by and novel close proximity(NCPX). The pass-by test and NCPX method are related to noise propagation and tire/pavement interaction noise measurement, respectively. For the water permeable tests, five sections were chosen; furthermore, the measurements were conducted for both of wheel path and non-wheel path area. For the pass-by measurement, three sections were chosen; furthermore, two different locations, which were near measurement point to traffic noise and far measurement point inside park or hosing complex, were selected for each section. Finally, tire/pavement interaction noise measurements were carried out at four locations. The results show that the functional performance of water permeability and noise reduction was well remained within 2 or 3 years after permeable pavement construction.