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A new approach for determining resilient moduli of marginal pavement base materials using the staged repeated load CBR test method

机译：分阶段重复荷载CBR试验方法确定边缘路面基础材料弹性模量的新方法

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The selection of marginal materials to construct workable and durable pavement base materials requires an understanding of their resilient moduli properties. Empirical formulations have been developed previously based on quality quarried material with known performance-based behaviour. However, in recent years, there has been an increasing demand to use locally available marginal materials, which do not necessarily meet road authority specification requirements; hence it is imperative to evaluate the performance of these non-standard materials. In this study, the geotechnical properties of two marginal materials, namely limestone (Ls) and sandstone (Ss), were evaluated and compared with a high-quality rhyolite (Rh) crushed rock. In order to improve the performance of the marginal materials, each of Ls and Ss was blended with 20% Rh and 50% Rh. The geotechnical properties of individual and blended materials which were investigated included: particle size distribution, particle density, Atterberg limits, Los Angeles value, modified compaction test, California bearing ratio (CBR) and repeated load triaxial test. A novel test method termed repeated load CBR (RL-CBR) was used to investigate the performance properties of the individual materials and blends. The RL-CBR test was further developed to study the stress-dependent behaviour of the materials, termed as staged RL-CBR test. An in-depth analysis of the staged RL-CBR test confirmed the capability of this test method to determine the resilient modulus of marginal pavement base materials.
机译：选择边缘材料来构造可行的和耐用的路面基础材料需要了解其弹性模量特性。先前已经基于具有已知基于性能的行为的优质采石材料开发了经验公式。但是，近年来，使用本地可用的边际材料的需求不断增长，这些材料不一定满足道路管理规范的要求；因此，必须评估这些非标准材料的性能。在这项研究中，评估了两种边缘材料的岩土特性，即石灰石（Ls）和砂岩（Ss），并将其与优质流纹岩（Rh）碎石进行了比较。为了提高边缘材料的性能，将Ls和Ss中的每一个与20％的Rh和50％的Rh混合。所研究的单个和混合材料的岩土特性包括：粒径分布，颗粒密度，Atterberg极限，洛杉矶值，修正压实试验，加利福尼亚承载比（CBR）和重复载荷三轴试验。一种称为重复载荷CBR（RL-CBR）的新型测试方法用于研究单个材料和共混物的性能。进一步开发了RL-CBR测试以研究材料的应力依赖性行为，称为分阶段RL-CBR测试。对分阶段的RL-CBR测试的深入分析证实了该测试方法确定边缘路面基础材料的弹性模量的能力。

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