Influence of aggregate packing structure on California bearing ratio values of unbound granular materials
Influence of aggregate packing structure on California bearing ratio values of unbound granular materials
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DOI：
10.1080/14680629.2013.863160
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发表时间：
2014-01
影响因子：
3.7
通讯作者：
Tatek Fekadu Yideti;B. Birgisson;D. Jelagin
中科院分区：
文献类型：
--
作者：
Tatek Fekadu Yideti;B. Birgisson;D. Jelagin
在过去的几十年里，加州承载比（CBR）值已被许多国家用于经验路面设计，仍有许多国家将其用于非粘结颗粒材料的强度测量，并作为其路面设计图的输入。此外，松散颗粒材料的CBR值通常与其基本力学性能（如弹性模量）相关，而弹性模量通常被用作机械路面设计过程的输入。本文研究了集料填料对未粘结材料CBR值的影响。提出了一种基于填料理论的框架，可以识别骨料骨架的承载部分。介绍了控制未粘结颗粒材料CBR性能的聚集体填料参数，并用文献中发现的20种未粘结颗粒材料的CBR实验测量值进行了评价。结果表明，颗粒材料的CBR值在很大程度上受其承载骨架的堆积特性控制。
Over the past several decades, California bearing ratio (CBR) value has been used in many countries for empirical pavement designs and still many countries are using it for unbound granular materials strength measurement and as input to their pavement design chart. Furthermore, CBR value of unbound granular material is frequently correlated with its fundamental mechanical properties such as resilient modulus, which in turn is often used as an input to a mechanistic pavement design procedure. In the present study, the effect the aggregate packing has on the CBR values of unbound materials is investigated. A packing theory-based framework that allows to identify the load-carrying part of the aggregate skeleton is presented. Aggregate packing parameters controlling the CBR performance of the unbound materials are introduced and evaluated with the experimentally measured CBR values of 20 unbound granular materials found in the literature. It is shown that the CBR values of granular materials are to a great extent controlled by the packing characteristics of their load-carrying skeleton.