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首页> 外文会议>Airfield and Highway Pavement Specialty Conference; 20060430-0503; Atlanta,GA(US) >PENNDOT's Efforts to Improve Pavement Subgrade During Highway Reconstruction
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PENNDOT's Efforts to Improve Pavement Subgrade During Highway Reconstruction

机译：PENNDOT在高速公路重建过程中努力改善人行道路基

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摘要

Like many highway agencies, the Pennsylvania Department of Transportation (PENNDOT) faces the challenge of aging roadways where the pavement has effectively reached the end of its serviceable life. In many cases, complete pavement reconstruction is warranted. Among other advantages, pavement reconstruction offers the opportunity to replace or improve the pavement foundation. Recognizing that the underlying subgrade on many Pennsylvania roadways consists of wet, fine grained soil that can be problematic, PENNDOT sought to develop procedures and specifications to improve the pavement subgrade during reconstruction. Working jointly with industry, PENNDOT developed new specifications for subgrade improvement that allow the contractor to select the improvement method from two options - remove and replace the undesirable soil or chemically stabilize the existing soil with lime, lime and fly ash or lime kiln dust (LKD). Lime, lime-fly ash and LKD stabilized soil are engineered products that must be properly evaluated, proportioned and constructed in order to obtain the good long-term performance that PENNDOT seeks. This evaluation is to be done by the contractor during construction - contractor-designed soil stabilization. This paper: 1. Summarizes the issues with wet, weak pavement subgrade soil. 2. Describes the options for improving the subgrade soil (per the new PENNDOT specification). 3. Summarizes PENNDOT's new specification provisions for soil stabilization. 4. Describes PENNDOT's engineering criteria for contractor-designed soil stabilization using lime, lime-fly ash and lime kiln dust. 5. Reviews bid costs of the options from bid tabs on the pilot projects.
机译：像许多高速公路机构一样，宾夕法尼亚州交通运输部（PENNDOT）面临着路面老化的挑战，因为路面已经有效地达到了使用寿命。在许多情况下，必须进行完整的路面重建。除其他优点外，路面重建还提供了更换或改善路面基础的机会。 PENNDOT意识到许多宾夕法尼亚州道路上的基础路基由可能存在问题的潮湿细粒土壤组成，因此寻求制定程序和规范以在重建过程中改善路面路基。 PENNDOT与业界合作，开发了用于路基改良的新规范，使承包商可以从两种选择中选择改良方法-去除并替换不良土壤，或用石灰，石灰，粉煤灰或石灰窑粉尘（LKD）化学稳定现有土壤）。石灰，粉煤灰和LKD稳定土是工程产品，必须对其进行适当的评估，配比和构造，以获得PENNDOT寻求的良好的长期性能。该评估将由承包商在施工过程中进行-承包商设计的土壤稳定性。本文：1.总结了湿润，较弱的路面路基土壤的问题。 2.描述改善路基土壤的选项（根据新​​的PENNDOT规范）。 3.总结了PENNDOT关于土壤稳定的新规范规定。 4.说明PENNDOT的承包商使用石灰，石灰粉煤灰和石灰窑粉尘进行土壤稳定化的工程标准。 5.从试点项目的“投标”选项卡中查看选项的投标成本。

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