<p>Asphalt pavement segregation is the unevenness of the main properties of the asphalt mixture in a certain area of ​​the pavement, including the asphalt content, the gradation composition, the additive content and the porosity of the pavement, thus accelerating the damage of the asphalt pavement. Some early damage to the asphalt pavement of the expressway, such as the crack, deformation and potholes caused by water damage, local severe rut groove, local pan oil, transverse cracks, and the uneven construction depth of the new asphalt pavement are all The separation of the mixture is related.</p>
<P>(1) gradation isolation hot mix asphalt mixture in the production, transportation, paving the process of improper operation of the mixture caused by uneven distribution of coarse aggregate, resulting in segregation. The asphalt pavement has a large porosity and a low asphalt content, resulting in water damage and durability of the asphalt pavement, resulting in fatigue cracks, pits and other diseases such as peeling, and fine concentrates Asphalt pavement of the porosity is small, asphalt content, easy to produce rut, pan oil and other diseases.</P>
<P>(2) temperature separation of hot mix asphalt mixture in the transport, paving process, due to different locations of the mixture temperature drop is inconsistent, resulting in the temperature difference between the mixture, resulting in temperature segregation. The mixture on the surface of the transport vehicle, the sides of the carriage and the two wings of the paver are prone to temperature segregation.</P>
<P>(3) aggregate - asphalt segregation of oil mixture is more prone to this separation, similar to the asphalt mixture of leakage, SMA mixture is easy to produce this separation.</P>

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