To counter the feature of overlaying in thin layer , this paper introduces the choice of asphalt mixture gradation used in the covering of pavement of Shi-An Espressway.
针对薄层罩面的特点 ，介绍了石安高速公路罩面沥青混合料级配的选择方法。
Affecting the shearing stress of the thin layer is its thickness and combined degree between asphalt concrete and cement concrete pavement.
影响剪应力的大小主要是薄层的厚度和薄层与水泥混凝土道面的结合程度。
In order to reduce the expansion stress resulting from cement's expansion and prolong the life-span of porcelain insulator, a thin asphalt buffer layer is coated between the porcelain and the cement.
为了降低水泥膨胀所引起的膨胀应力，延长瓷绝缘子的使用寿命，在胶装时一般在瓷体和水泥之间涂一层沥青缓冲层。
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