文档介绍：外文原文
Highway asphalt pavement Preventive Maintenance
Abstract: The high-grade highway asphalt pavement and damaged the various early stage disease, the type of damage and its causes, and made a crack repair, slurry seal asphalt pavement, such as preventive conservation technology.
Key words: asphalt pavement; conservation
asphalt pavement and the type of damage causes
type of damage
The asphalt pavement damage can be divided into: crack category, loose category, class and other types of deformation of the four major categories
Causes
(1) horizontal cracks in this mon disease, mainly due to contraction of asphalt surface temperature and semi-rigid or temperature shrinkage of the shrinkage caused. Roadbed degree paction less than this will lead to disease
(2) vertical cracks in most cases took place in a half filled or half-dug embankment road widening, mainly from the roadbed caused by uneven settlement.
(3) cracking along its initial shape is round with a single trace or more of parallel vertical joints, gradually appeared in the horizontal or vertical Feng Jian oblique connection joints cracking form. Mainly due to lack of structural strength from the road
(4) along the road to track performance with a horizontal height difference, mainly because of foot-graded asphalt mixture design unreasonable. Poor or because of the stability of the grass-roots level