为了对排水性沥青混合料的透水能力进行测评, 分析影响沥青混合料透水能力的各种因素, 使用了自行研制的渗透系数测试仪进行测试。通过对不同空隙率、级配、沥青品质试件的测试, 发现空隙率与沥青混合料的渗透系数有着良好的相关性:空隙率相同的条件下, 集料粒径越大, 混合料的渗透系数越大:沥青品质对混合料的渗透系数影响不大。结果表明:空隙率可以作为沥青混合料渗透系数的控制指标, 集料的最大粒径、2.36 mm筛孔的通过率都是影响渗透系数的重要因素:测试得出排水性沥青混合料的合理水力坡度应小于等于0.03, 渗透系数大于1.5×10-2 cm/s可以作为评价排水性沥青混合料渗透能力的指标。
Abstract
Authors present a device for measuring hydraulic conductivity of porous asphalt in order to analyze the factors that influence hydraulic conductivity of asphalt mixture.Asphalt mixtures of different air voids, aggregate gradations and asphalt binders are tested.It is concluded from the test that hydraulic conductivity is much concerned with air voids and aggregate gradation, rather than the properties of asphalt binders.Moreover, it can be drawn that air void is a key index that influences bydraulic conductivity of asphalt mixture, and both aggregate size and percent passing ratio of 2.36 mm sieve opening have great influences on hydraulic conductivity:rational hydraulic gradient for measuring hydraulic conductivity of porous asphalt mixture should be less than 0.03, and the quota 1.5×10-2 cm/s can be regarded as the technical norms to comment on the permeability of the porous asphalt mixture.
关键词
道路工程 /
排水性沥青混合料 /
试验研究 /
渗透系数 /
空隙率 /
水力坡度
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Key words
road engineering /
porous asphalt mixture /
experimental research /
hydraulic conductivity /
percentage of air void /
hydraulic gradient
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中图分类号：
U414.1
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参考文献
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脚注
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基金
国家西部交通建设科技项目(2001 318 22332)
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