Cause analysis on water damage of asphalt pavement

Cause analysis on water damage of asphalt pavement

For nearly two years, soon built many highways, asphalt pavement early damage will occur. These damages are mainly as follows: water permeable pavement mixture and water are common, in many areas the rainy season or spring thaw season, loose, pit road slurry, become a serious failure. Effective analysis and measures to prevent water damage is significant.

Analysis of causes of asphalt pavement water damage:

Asphalt pavement is attached to the aggregate of asphalt-aggregate glued together. Asphalt pavement, asphalt and aggregate adhesion and peeling resistance is to keep pavement performance is one of the basic conditions.

So-called asphalt pavement water damage refers to in the presence of moisture on asphalt pavement conditions, subjected to repeated traffic loading, while moisture gradually penetrated into the asphalt and aggregate interface, and because of hydrodynamic effects, asphalt membrane gradually split from the aggregate surface, and led to the loss of bond strength between aggregate and road damage. Due in asphalt pavement material choices, hard choices of high quality stone, using coarse grain size, appropriate measures such as reducing asphalt content, creates problems, namely lack of water stability of asphalt pavement in the spring melt season and rainy season, part of road pock marks, loose and even the pit gradually appear. Water damage has become a major mode of pavement damage.

Asphalt pavement water damage mechanism and characteristics, you can see from the development course of destruction:

It should be noted that is, water damage may be start from beneath the asphalt surface layer. Due to water entering the asphalt pavement, stranded on top of grass-roots, asphalt surface layer layer is larger voids of asphalt macadam or type II asphalt mixtures, voids filled with water, poses a potential threat to asphalt pavement water damage. So in set material and asphalt film stripping, and occurred loose Hou, asphalt mixed material no longer into a overall, set material in load contains role Xia on grass-roots surface produced impact, grass-roots of powder quality part as cement, and lime, and fly ash and soil part will became dilute pulp, through road of gap up extrusion, in asphalt road Shang can see white of Jack pulp, surface layer visible local of tortoise shell-like crack, this is asphalt road water damage most obviously of logo. When asphalt pavement on pieces of Pan-white network of cracks that occurred when bottom layer has become loose aggregates of bituminous membrane completely detached, pothole is unavoidable.