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Ternary Property Maps for Asphalt Concrete

机译:沥青混凝土三元性能图

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Asphalt concrete can be considered a three-phase particulaterncomposite. As such, its composition can be effectively representedrnusing a triangular chart, in which the three axes are voids inrnmineral aggregate (VMA), effective binder content (Vbe), and airrnvoids in total mix (VTM). Using triangular charts andrnmathematical models relating performance-related properties tornvolumetric composition, ternary property maps can be constructed.rnThese charts graphically illustrate the complex relationshipsrnamong volumetric composition and such properties as modulus, rutrnresistance, fatigue resistance, and permeability. Althoughrnconstruction of a simple triangular chart showing the compositionrnof one or more asphalt concrete mixtures is straightforward,rndevelopment of ternary property maps is a more complexrnprocedure. On the basis of several ternary property mapsrnpresented in this paper, a few general observations can be madernconcerning the relationships between volumetric composition andrnthe potential performance of asphalt concrete mixtures. Rutrnresistance tends to increase with decreasing VMA; fatiguernresistance appears to increase with increasing Vbe and/or VFA.rnPermeability tends to decrease with increasing VFA and increasingrnaggregate fineness. Both minimum and maximum VMA valuesrnshould be established for Superpave mixtures. Considerationrnshould also be given to establishing minimum Vbe values linked torndesign traffic levels.
机译:沥青混凝土可以看作是三相颗粒复合材料。这样,可以使用三角图有效地表示其组成,其中三个轴是矿物总骨料(VMA),有效粘结剂含量(Vbe)和总混合物中的气隙(VTM)的空隙。使用将与性能相关的性能与体积组成相关的三角图和数学模型,可以构建三元特性图。这些图以图形方式显示了体积组成与模量,耐反光性,耐疲劳性和渗透性等复杂关系。尽管构建一个简单的三角图来显示一种或多种沥青混凝土混合物的组成是很简单的,但是开发三元特性图却是一个更为复杂的过程。根据本文提出的几种三元特性图,可以对沥青混凝土混合料的体积组成与潜在性能之间的关系作一些一般性的观察。随着VMA的降低,耐痕迹性趋于增加;耐疲劳性似乎随着Vbe和/或VFA的增加而增加。渗透率往往随VFA的增加和骨料细度的增加而降低。应该为Superpave混合物确定最小和最大VMA值。还应考虑建立与设计流量水平相关的最小Vbe值。

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