Best Value Granular Material for Road Foundations
Best Value Granular Material for Road Foundations
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发表时间：
2012
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通讯作者：
Yuanjie Xiao;Erol Tutemluer
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作者：
Yuanjie Xiao;Erol Tutemluer
在明尼苏达州的许多地方，骨料基础材料变得越来越昂贵，因为砾石矿和采石场正在被其他土地使用所取代。这些骨料根据几十年前的设计程序和测试技术分类使用和大量放置。为了优化材料使用并减少浪费，需要实施新的基于机械的设计程序和测试技术，以在道路施工期间实现更好的价值。本研究旨在通过机械路面分析和设计，评估明尼苏达州当地可用骨料（级配仍在明尼苏达州交通部规定的级配带范围内）的路面基层/底基层性能。本研究的主要目的是证明，当地可用的骨料材料可以在经济上有效的实施现有的机械为基础的设计程序在明尼苏达州通过MnPAVE机械经验柔性路面设计方法。我们的目标是开发一个新的粒状材料最佳价值软件模块的组件添加到MnPAVE程序。本报告总结了详细的研究结果，从中可以得出以下结论：（1）从力学经验路面设计的角度来看，只要对重要的集料特性（如级配和颗粒形状）进行优化，当地可用的不同质量水平的集料材料仍然可以适当地满足交通水平和环境相关的荷载;（2）由于模量与强度的关系并不唯一，因此需要适当处理基层，特别是底基层的潜在剪切破坏;（3）适当使用当地材料可能具有相当的成本效益。
Aggregate base materials are becoming increasingly expensive in many parts of Minnesota because gravel mines and rock quarries are being lost to other land uses. These aggregate materials are classified for use and placed in quantities based on design procedures and testing techniques that are several decades old. To optimize material use and reduce waste, new mechanistic-based design procedures and testing techniques need to be implemented to achieve better value during road construction. This research study is aimed at evaluating pavement base/subbase performances of locally available aggregate materials (with gradations still falling within the Minnesota Department of Transportation specified gradation bands) in Minnesota through mechanistic pavement analysis and design. The main objective of this study is to demonstrate that locally available aggregate materials can be economically efficient in the implementation of the available mechanistic-based design procedures in Minnesota through the MnPAVE mechanistic-empirical flexible pavement design method. The goal is to develop the components of a new granular material best value software module to be added to the MnPAVE program. This report summarizes the detailed research findings from which the following conclusions can be drawn: (1) locally available aggregate materials with varying levels of quality can still properly serve traffic-level and environment-related loading from a mechanistic-empirical pavement design perspective provided that important aggregate properties, such as gradation and particle shape, are optimized; (2) potential shear failure in base and especially subbase need to be properly addressed as non-unique modulus-strength relationships were observed; and (3) the proper use of local materials can be quite cost-effective.