Dynamic water pressure, driving wheel in an instant, the wheel load on the road caused by the hydrodynamic pressure, first squeeze, forcing the gap in the water along the gap around the squeeze, seepage. When the wheels leave, the vacuum suction after the wheel, the rebound of the road itself, will cause the structure of the retention of water to produce suction and return, so the pressure of water squeeze, pumping rinse, alternating alternately in the asphalt mixture The In addition, the high energy of water molecules and aggregate adhesion than the aggregate and aggregate adhesion is greater, will accelerate the surface of the aggregate and asphalt molecules replacement, so that the quality of asphalt mixture quickly deteriorated.

Water damage prevention and control, domestic research on water damage prevention and control focused on two aspects, one is to improve the adhesion of asphalt and aggregate to improve the adhesion between the aggregate, the second is to prevent moisture into the asphalt mixture and asphalt and set Material on the interface. Can be related to the asphalt pavement design, construction, management and conservation of all links.Road Repair Machines

Improve the adhesion of the pavement material and adhesion, for the asphalt, the choice of large viscosity, with or without the water-sensitive components of the bitumen, or the use of polymer modified asphalt, for the asphalt water stability Problem, can be mixed with appropriate anti-stripping agent; for aggregates, is required to surface rough, containing more calcium and magnesium and other high-priced cations, large surface area, was hydrophobic, and to ensure that the surface clean; Under the premise of appropriate relaxation of the aggregate density and water absorption limit, and through the acidity and alkaline test evaluation, select the alkaline aggregate; for the mixture to choose a reasonable level.

The water stability and improvement measures of different types of asphalt blends were studied. It was concluded that the water stability of different types of asphalt mixture of basalt was not always able to meet the requirements. Lime additive can improve the water stability of asphalt mixture; for AC-13 grade asphalt concrete and SM A-13 asphalt mastic gravel mixture, the effect of good lime; hydrostatic pressure on the asphalt pavement water damage and softening and peeling Two processes related. First, the water can enter the asphalt to reduce the adhesion of asphalt, resulting in reduced strength of the mixture; Second, the water can enter the asphalt film and aggregate between the blocking asphalt and aggregate bonding. As the aggregate surface of the water adsorption force than the asphalt adsorption force, resulting in asphalt and aggregate surface contact surface decreased, the result of asphalt from the aggregate surface peeling off.