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Analysis on Optimization Design and Viscoelastic Response of Conductive Asphalt Pavement Using Snowmelt

Author: WangHong
Tutor: WuShaoPeng
School: Wuhan University of Technology
Course: Materials Science
Keywords: Conduction asphalt pavement Snow and ice Finite Element Heat exchange pipes Viscoelastic response
CLC: U416.217
Type: PhD thesis
Year: 2010
Downloads: 354
Quote: 2
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Abstract

Use of asphalt concrete, highly conductive asphalt pavement used for winter road surface snowmelt is domestic and foreign experts and scholars generally study design issues. In this paper, the finite element method using the basic principles of heat transfer analysis of the thermal conductivity of the asphalt pavement, heat exchange pipes buried depth and pipe spacing on conductive asphalt pavement in summer cooling effect of melting ice in winter, determine a reasonable buried The depth and pipe spacing, and laboratory and field test evaluation; reasonable conduction of heat exchange pipes arranged asphalt pavement under moving loads viscoelastic response analysis to estimate the design fatigue life. Expected research results in this article, not only on the airport runway, road, bridge deck cooling in summer, winter snowmelt and ice method has important practical significance, but also designed to play a guiding role in the structure of the conduction asphalt pavement. ANSYS software to optimize the design of the conduction of the performance of asphalt pavement snowmelt. The conduction asphalt pavement snow and ice time with the asphalt concrete material thermal conductivity coefficient was exponential relationship; buried deeper the increase asphalt concrete thermal conductivity of snow and ice effects are more obvious. Conduction asphalt pavement heat exchange pipes according to the thickness of the asphalt pavement layer are arranged at the two methods (asphalt concrete thermal conductivity ≥ 3.0W / (m · ° C)): (1) Buried Depth 10cm pipe spacing 0.1m; (2) buried underground pipe when the depth of 4cm spacing of 0.15M. By conduction asphalt pavement in the hot summer conditions the temperature distribution studies: the maximum temperature of the asphalt pavement to at 2cm in below the road surface. Conductive asphalt concrete material selection can be reduced by more than 3.8% makes the highest temperature of the asphalt pavement. Pass into the co-refrigerant (water) can effectively reduce the road surface and the interior temperature within the heat exchange pipes. Conduction 3.0W / (m · ℃) thermal conductivity of asphalt pavement in summer heat exchange pipes pass into help refrigerant (25 ° C water) can make the road surface temperature drop of more than 20%. Buried-type conduction study the viscoelastic response of asphalt pavement in moving loads using finite element software ABAQUS. Obtained converted to asphalt mixture viscoelastic constitutive relation Prony series method. Conduction of heat exchange pipes buried asphalt pavement or asphalt pavement, traffic loads, the maximum tensile strain at the bottom of the the pavement layer below layer. Heat exchange pipes can effectively weaken the maximum tensile strain in the surface layer at the bottom. Road structure buried or not and buried what kind of heat exchange pipes pavement fatigue life, buried-type conduction asphalt pavement design can ordinary asphalt pavement design method.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Pavement Engineering > Road : use of the material points > Asphalt Pavement
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