• Title/Summary/Keyword: macrotexture

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Analysis of Texture Depth of Asphalt Pavement Based on Profile Analysis (프로파일 분석을 통한 아스팔트 콘크리트 포장 텍스쳐 크기 분석)

  • Park, Dae-Wook
    • International Journal of Highway Engineering
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    • v.14 no.3
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    • pp.9-14
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    • 2012
  • In this study, the profiles of asphalt pavements were measured using a lightweight profiler and depths of macrotexture were analyzed based on the measured profiles. Profiles on dense graded asphalt pavement, prorous asphalt pavement, stone mastic asphalt (SMA) pavement, and base layer measured, and depth of macrotexture were calculated and analyzed. Profiles on the pavement that happened as asphalt mixture segregation were measured and depths of macrotexture were analyzed. The results showed that the depths of macrotexture of asphalt pavement were effectively calculated using the measured profiles, and the depths of macrotexture for different asphalt pavements were analyzed. The pavement areas which have asphalt mixture segregation were detected based on analysis of macrotexture depths.

Analysis of Texture Characteristics of Asphalt Pavements (아스팔트 포장의 노면조직 특성 분석)

  • Hong, Seong Jae;Lee, Seung Woo
    • International Journal of Highway Engineering
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    • v.19 no.2
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    • pp.1-6
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    • 2017
  • PURPOSES : Pavement textures can be categorized into four according to wavelength: microtexture, macrotexture, megatexture (roads), and roughness. Pavement surface texture influences a number of aspects of tire-pavement interaction such as wet-weather friction, tire-pavement noise, splash, spray, tire-wear, and rolling resistance. In particular, macrotexture is the pavement surface characteristic that considerably impacts tire-pavement noise. In general, it can be demonstrated that tire-pavement noise increases with the increase of texture depth and wavelength. Recently, mean profile depth (MPD) and wavelength have been used to evaluate tire-pavement noise. This study aimed to identify the relationship between mean profile depth and average wavelength for asphalt pavement based on the information obtained on a number of asphalt pavement sections. METHODS : Profile data were collected from a number of expressway sections in Korea. In addition, mean profile depth and average wavelength were calculated by using this profile data. Statistical analysis was performed to determine the correlationship between mean profile depth and average wavelength. RESULTS:This study demonstrates a linear relationship between mean profile depth and average wavelength for asphalt concrete pavement. CONCLUSIONS :The strong relationship between mean profile depth and average wavelength of asphalt pavement was determined in this study.

A Study on Evaluating the Applicability of Trapezoidal-shaped Grooves to Airport Runways (사다리꼴 형상 그루빙의 공항 활주로 적용성 평가 연구)

  • Cho, Nam-Hyun;Kim, Dong-Chul;Phi, Seung-Woo;Shin, Joong-Ha
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.29 no.4
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    • pp.78-87
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    • 2021
  • This study is to evaluate the applicability and performance of trapezoidal-shaped grooves on domestic airport runways. For this, the constructability, drainage performance, and friction resistance characteristics of trapezoidal-shaped grooves compared to square-shaped grooves were evaluated through test construction on pavement at Incheon Airport. As a result of the test construction, the trapezoidal-shaped grooves satisfies the required geometry standards and tolerance, and secured a macrotexture that was 25% improved compared to the square-shaped grooves. It was confirmed that trapezoid-shaped grooves secured drainage performance of more than 7-9%, and surface friction performance improved compared to existing grooves when the surface of the pavement was wet as the test speed increased in the dry state. In addition, after trapezoidal-shaped grooves was installed on the RWY 16R/34L of Incheon Airport, the friction coefficient was 0.84, which satisfies the design level of the new runway surface of 0.82 at the test speed.

Simulation of Inhomogeneous Texture through the Thickness Direction during Hot Rolling Deformation in Strip Cast Al-5wt%Mg Alloy (박판 주조된 Al-5 wt%Mg 합금의 열간압연 시 두께방향 불균일 집합조직 시뮬레이션)

  • Song, Young-Sik;Kim, Byoung-Jin;Kim, Hyoung-Wook;Kang, Seok-Bong;Choi, Shi-Hoon
    • Korean Journal of Metals and Materials
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    • v.46 no.3
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    • pp.135-143
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    • 2008
  • The inhomogeneous texture through the thickness direction can be developed during hot rolling deformation in aluminum alloy. In this study, the inhomogeneous texture evolution through the thickness direction during hot rolling deformation in Al-5 wt%Mg alloy produced by a new strip casting technology was measured experimentally. Macrotexture measurement was conducted using X-ray diffractometer. A finite element analysis with ABAQUS/StandardTM and rate sensitive polycrystal model were used to predict the evolution of hot rolling texture. The experimental results of Al-5 wt%Mg alloy were compared with calculated results. The shear texture components tend to be increased at the surface region of the hot-rolled specimen. It is found that triclinic sample symmetry is more accurate assumption for texture analysis and simulation in the surface region of hot-rolled aluminum alloy.