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Laboratory Investigation of the Mechanical Stability of Unbound Permeable Aggregate Base Materials: Preliminary Direct Shear Test Results

机译：实验室调查未结合渗透骨料基础材料的机械稳定性：初步直接剪切试验结果

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摘要

Unbound permeable aggregate base (UPAB), due to its relatively high porosity and permeability, is considered as an alternative to traditional impervious (e.g., dense-graded) bases for controlling subsurface drainage and pavement longevity in an economical and environment-friendly way. The UPAB layer is normally made of open-graded unbound aggregates and thus tends to suffer from insufficient structural strength (or stability). Aimed at further validating a new gradation concept for enhanced structural strength, this paper presented preliminary findings from a series of laboratory tests conducted to evaluate various gradation designs of UPAB materials in relation to mechanical stability. Five representative gradations were selected according to the current UPAB gradation band, and the effects of different UPAB gradation designs on the shear strength properties were investigated using a large-scale direct shear test device. Based on the experimental results, the optimum aggregate gradation design recommended by the new gradation concept for enhanced stability was consequently validated. The use of such optimal gradation is expected to achieve cost-effective UPAB design for long-life concrete pavements.
机译：由于其相对较高的孔隙率和渗透性，未渗透性聚集碱（UPAB）被认为是以经济和环境友好的方式控制地下排水和路面寿命的传统渗透率（例如，密集分级）底座的替代方案。 upab层通常由开放式未结合聚集体制成，因此倾向于遭受结构强度（或稳定性）的不足。旨在进一步验证新的渐变概念以提高结构强度，本文提出了一系列实验室测试的初步发现，以评估与机械稳定性相关的UPAB材料的各种灰度设计。根据目前的Upab灰度频带选择五个代表性灰度，使用大规模直接剪切测试装置研究了不同Upab灰度设计对剪切强度性能的影响。基于实验结果，新渐变概念推荐的最佳聚集灰度设计得到了验证的增强稳定性。预计使用这种最佳灰度将实现用于长寿命混凝土路面的经济高效的Upab设计。

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