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首页> 外文期刊>Transportation Research Record >Field and Laboratory Investigation of Permeable Asphalt Mixes on Georgia Highways
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Field and Laboratory Investigation of Permeable Asphalt Mixes on Georgia Highways

机译：佐治亚州高速公路上的渗透性沥青混合料的现场和实验室研究

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The Georgia Department of Transportation (GDOT) investigated possible high permeability in asphalt mixes statewide in response to reports of prolonged wetness on pavements around the state after rainfall. In these locations, high permeability manifested itself as wet areas on pavement surfaces where wetness remained after natural conditions should have removed all moisture from the surfaces. Sixteen project sites were inspected for problem areas statewide, and core specimens were taken from six of the sites. Specimens were taken from areas considered representative of the problem areas in each project. The specimens were tested to determine the permeability, bulk specific gravity, maximum theoretical specific gravity, percentage of air voids, percentage of asphalt cement, and gradation of the mix. According to the findings of this investigation, some Superpave~® mixes that were designed in accordance with GDOT specifications exhibited undesirable permeability. The investigation determined that both mix design and construction contribute to permeable mixes; hence, permeability problems are to be corrected by a balanced adjustment to these processes, according to the following recommendations: (a) for each Superpave mix type used in Georgia, develop mix-specific acceptance criteria for maximum in-place air voids; (b) include evaluation of mix permeability in mix design; and (c) provide continued quality control during construction operations to ensure the success of the mix-specific acceptance criteria.
机译：佐治亚州交通运输部（GDOT）调查了全州沥青混合料可能的高渗透性，以应对降雨后该州周围人行道长时间潮湿的报道。在这些位置，高渗透性表现为人行道表面上的潮湿区域，在自然条件下本应清除表面上的所有水分后仍保持潮湿。在全州范围内检查了16个项目站点的问题区域，并从6个站点中提取了核心样本。标本取自被认为代表每个项目中问题区域的区域。测试样品以确定渗透率，体积比重，最大理论比重，气孔百分比，沥青水泥的百分比以及混合物的级配。根据调查的结果，某些根据GDOT规范设计的Superpave®混合物表现出不希望的渗透性。调查确定混合料的设计和施工均有助于渗透混合料。因此，根据以下建议，应通过对这些过程进行均衡的调整来纠正渗透性问题：（a）对于佐治亚州使用的每种Superpave混合料类型，制定混合料专用的可接受标准，以最大程度地减少空气中的空隙； （b）在混合料设计中包括混合料渗透性的评估； （c）在施工过程中提供持续的质量控制，以确保特定于混合物的验收标准的成功。

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