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首页> 外文会议>Asphalt paving technology 2003 >Comparison of the Saturated Surface-Dry and Vacuum Sealing Methods for Determining the Bulk Specific Gravity of Compacted HMA
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Comparison of the Saturated Surface-Dry and Vacuum Sealing Methods for Determining the Bulk Specific Gravity of Compacted HMA

机译：饱和表面干燥法和真空密封法测定压实HMA体积比重的比较

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Typically, the bulk specific gravity of compacted hot mixrnasphalt (HMA) is determined using the saturated surface dryrncondition. Procedures for determining bulk specific gravity by thisrnmethod are outlined within AASHTO T166 and ASTM 2726.rnHowever, within the HMA community there has been anrnincreasing concern about determining the bulk specific gravity ofrncompacted HMA by this method. This is especially true for mixesrnhaving coarse gradations like many Superpave designed mixes andrnstone matrix asphalt.rnThe concern with the saturated surface dry condition method isrnthat these coarse-graded mixes contain a large proportion ofrninterconnected air voids, especially in field compacted HMA.rnLarge interconnected air voids that are connected to the surface ofrna sample potentially allow water to exit the sample during thernpatting of the sample to reach the saturated surface dry condition.rnThis loss of the water from the sample causes the potential errorsrnwith the saturated surface dry method.rnRecently, a new method of determining the bulk specificrngravity of compacted HMA has been developed. This method usesrna vacuum-sealing device to tightly conform a plastic bag aroundrncompacted samples. A number of recent studies have shown thatrnthis method provides a good estimation of bulk specific gravity,rneven when samples have low density (i.e., high air voids).rnHowever, most of the work has focused on laboratory compactedrnsamples (e.g., Superpave gyratory compactor samples). Also,rnguidance on when this new test method should be used instead ofrnthe saturated surface dry method has not been provided.
机译：通常，使用饱和表面干燥条件确定压实的热混合沥青（HMA）的体积比重。在AASHTO T166和ASTM 2726中概述了通过这种方法确定堆积比重的程序。然而，在HMA社区中，人们越来越关注通过这种方法确定紧凑的HMA的堆积比重。对于具有像许多Superpave设计的混合物和rnstone基质沥青这样的具有粗糙渐变的混合物而言尤其如此。rn对饱和表面干燥条件方法的关注是，这些粗糙的混合物包含很大比例的相互连接的气隙，尤其是在现场压实的HMA中。与样品表面相连的水可能会在样品拍打达到饱和表面干燥条件时使水从样品中流出。这种水分的损失会导致样品在饱和表面干燥方法中的潜在误差。已经开发出确定压实HMA的体积比重的方法。该方法使用真空密封装置将塑料袋紧紧压紧压缩样品。近期的许多研究表明，即使样品的密度较低（例如，空气空隙较大），该方法也可以很好地估算体积比重。然而，大多数工作都集中在实验室压实的样品（例如，Superpave旋转压实机样品）上。 ）。另外，未提供有关何时应使用这种新的测试方法代替饱和表面干燥方法的指南。

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