骨料级配对混合料稳定性的影响

IF 0.1 Q4 ENGINEERING, CIVIL
E. Kalaitzaki, G. Kollaros, A. Athanasopoulou
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引用次数: 4

摘要

摘要路面的荷载传递能力在很大程度上受集料的影响。热拌沥青(HMA)混合料的总体积中约85%由集料组成;因此,它们受到诸如角度(形状)、粗糙度(纹理)和级配等骨料特性的极大影响。骨料级配控制空隙的结构。HMA路面中骨料性能的现行规范要求骨料混合料落在指定的级配值范围内。虽然上述要求确保了高质量的HMA路面的施工,但其性能在很大程度上是经验性的,并非基于与性能相关的测试。马歇尔稳定性原则上是沥青混合料的圆柱形试样在侧面加载时对塑性流动的阻力。为混合料在60oC时的承载能力。来自希腊北部广阔地区Xanthi的不同级配骨料已被用于制备实验室热沥青混合物稳定性测试的样品。研究重点是评价骨料对混合料整体稳定性特性的影响。当沥青含量为5%,骨料粒径为2.36 mm时,获得了最大的稳定值。而密级配混合料的稳定性高于该最大值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of aggregate gradation on hma mixes stability
Abstract The load transfer capacity of pavements is to a great extend influenced by aggregates. About 85% of the total volume of hot mix asphalt (HMA) mixtures consists of aggregates; thus, they are greatly influenced by aggregate properties like angularity (shape), roughness (texture), and gradation. Aggregate gradation controls the structure of voids. Current specifications for aggregate properties in HMA pavements require the aggregate blend to fall within a specified range of gradation values. Although the abovementioned requirement has ensured the construction of high quality HMA pavements, the properties are largely empirical and they are not based on performance-related tests. Marshall Stability is in principle the resistance to plastic flow of cylindrical specimens of a bituminous mixture loaded on the lateral surface. It is the load carrying capacity of the mix at 60oC. Aggregates with different gradations from the broader area of Xanthi, Northern Greece, have been used to prepare specimens for stability testing of hot asphalt mixtures in the laboratory. The research focused on the evaluation of the influence of aggregates in the overall stability characteristics of the mixtures. The maximum stability value has been obtained with an open-graded mixture having 5% asphalt and aggregate size 2.36 mm. However, the stability of the dense graded mixture is higher than this maximum value.
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