Cost-Effective Base Type and Thickness for Long-Life Concrete Pavements
Cost-Effective Base Type and Thickness for Long-Life Concrete Pavements
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发表时间：
2015-08
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通讯作者：
E. Tutumluer;Yuanjie Xiao;W. Wilde
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作者：
E. Tutumluer;Yuanjie Xiao;W. Wilde
路面基层质量对于长期性能至关重要。低刚度和剪切强度会导致支撑丧失和负载下拉应力增加。为了保持混凝土路面下的均匀支撑并确保令人满意的性能，需要稳定、不易腐蚀、可排水的基层。本报告的主要目的是根据当前制定的层厚度要求量化混凝土路面基础所需的骨料基础特性。根据以前明尼苏达州交通部 (MnDOT) 研究和相关文献收集的典型基层材料的机械和水力性能，评估了不同基层性能对混凝土路面性能的影响。收集来自 MnROAD 测试设施的现场测量环境数据并用于校准目的。相应地评估了环境条件对混凝土路面长期性能的影响。对 LTPP SPS-2 研究和 MnROAD 测试单元的数据进行了分析，以评估设计和场地因素对性能的影响。考虑级配、骨料形状特性和排水特性，建立了改进的骨料类别。对现场测试数据进行了分析，以评估开放级配骨料基质在提供结构稳定性方面的有效性。工程骨料形状和级配的分析级配分析和离散元建模方法用于预测现场性能。综合研究结果，建议修订支撑混凝土路面的骨料基层的性能相关规范。研究结果将理想地帮助设计适合混凝土和沥青路面的具有成本效益的基层类型和厚度。
Pavement base layer quality is vital for long term performance. Low stiffness and shear strength can result in loss of support and increased tensile stresses under loads. To maintain uniform support under concrete pavements and ensure satisfactory performance, a stable, non-erodible, drainable base layer is necessary. The primary objective of this report is to quantify the aggregate base properties required for concrete pavement foundations in accordance with currently established layer thickness requirements. The effects of properties of different base layers on concrete pavement performance were evaluated, based on the mechanical and hydraulic properties of typical base materials collected from previous Minnesota Department of Transportation (MnDOT) studies and relevant literature. Field measured environmental data from the MnROAD test facility was collected and used for calibration purposes. The effects of environmental conditions on long-term concrete pavement performance were evaluated accordingly. Data from the LTPP SPS-2 study and MnROAD test cells were analyzed to evaluate the effects of design and site factors on performance. Improved aggregate classes were established, considering gradation, aggregate shape properties and drainage characteristics. Field test data were analyzed to assess the effectiveness of open-graded aggregate bases in providing structural stability. The analytical gradation analysis and the discrete element modeling approach for engineering aggregate shape and gradation were used to predict field performance. The findings from the study were synthesized to recommend revisions for performance-related specifications for aggregate bases supporting concrete pavements. The results would ideally help design cost effective base types and thicknesses suitable for both concrete and asphalt pavements.