沥青混合料温度离析特性

Characteristics of temperature segregation in asphalt mixture

借助红外摄像仪观察了不同条件下沥青混合料摊铺面的温度分布,分析了其温度离析的不同表现性状和温度差异的形成原因,利用无核密度仪(PQI)研究了温度离析对沥青面层压实质量的影响。研究结果表明:温度离析对沥青面层压实质量的影响与离析区域的形状、面积和温度有关;当较低温度区域面积较大、温度低于不可接受的初压(表面)温度时,温度离析对沥青面层压实质量的影响必须予以足够重视;当温度离析区域面积较小,较低温度区域摊铺面温度高于不可接受的初压(表面)温度时,即使相邻摊铺面温度差异较大,但从压实度的角度看,沥青面层的质量仍符合《公路沥青路面施工技术规范》(JTG F40—2004)的要求。

Through the observation of the different temperature distributions of asphalt mixture in the mat by aid of the infrared camera instrument, this paper analyzed the different characteristics of the temperature segregated asphalt mixture in the mat, and researched the influence of temperature segregation on the compaction by using PQI（pavement quality indictor）. The results show that the influence of temperature segregation on the compaction is correlated with the shape, area and temperature of the segregated zone. The effect of temperature segregation on asphalt pavement compaction should be noticed sufficiently when the area with lower temperature is big enough and the temperature is lower than the unacceptable initial compaction （surface） temperature. Even the temperatures of adjacent pavement areas show a great difference, the quality of the asphalt pavement can meet the needs of the specification Technical Standard for Highway Asphalt Pavement Construction （JTG F40--2004） from the view of compactness, while the temperature segregation area is not big, and the lower temperature of the area is still above the unacceptable initial compaction （surface） temperature. 8 tabs, 7 figs, 10 refs.