As the highway speed, traffic volume, overweight vehicles, coupled with the external climate (sunlight, rain and snow) and other factors,Road Cutting Machine the road disease than the average speed of the road, the rapid development of governance is difficult, and over time The extension of the increasingly serious impact on the normal driving of vehicles. How to diagnose and remediate highway pavement diseases has become a new research topic in highway industry. In this paper, the diseases encountered in the treatment of freeway asphalt concrete pavement and the remediation measures are introduced.
First, the type of disease
In the common asphalt pavement disease, according to the damage of the type of disease, mainly in the following categories: cracking disease crack, crack, all kinds of vertical and horizontal cracks; deformation of the disease rut, subsidence, with package, washboard,Road Router Crack wave; Loose disease loose, peeling, peeling, pits, eating side; other diseases pump slurry, pan oil, polished and so on.
Second, the causes of disease
Cracks
1. Construction factors
① vertical and horizontal cracks in the surface of the disease, and the cause of most of the grass-roots or soil-based, poor bridge fill, bridges, culverts and road joints will also cause transverse or even the wrong platform.
② surface caused by vertical and horizontal cracks, and some patch in the surface layer, the joints of the old and new surface of the improper handling, bonding is not good, resulting in edge cracks.
(3) The excavation at the boundary of the excavation and the excavation is not enough, or the original ground of the excavation at the boundary of the excavation and excavation is not excavated,practical concrete cutting machine cost the clay deposited on the excavated surface is not turned away, Of the deformation caused by the surface of the vertical and horizontal cracks.
④ roadbed construction in the use of the original roadbed within the old road, or construction of roads and other new ground with the filling of the junction, the pressure is not true or inconsistent degree of compaction, when used in traffic, soil deformation caused by inconsistent vertical and horizontal crack.
⑤ Bridge, culverts back to fill pressure is not real, or soil-based fill although the embankment to achieve the degree of compaction, and bridge, culvert cement concrete part of the junction with the soil-based uneven deformation or contraction, resulting Bridge, culvert end of the transverse joints or the wrong platform.
⑥ Subgrade compaction degree is not enough, causing uneven deformation of roadbed, can also lead to longitudinal cracks in the road.
2. Vehicle load factors
As a result of the role of traffic load caused by structural damage to cracks, known as the load-type cracks. 3. Climatic factors are mainly caused by the temperature cracks of asphalt surface layer, including low temperature shrinkage cracks and temperature fatigue cracks, extreme minimum temperature,high efficient crack router Instructions for use cooling rate, low temperature duration, the number of cooling cycles is the weather conditions affect the asphalt pavement temperature shrinkage cracks Of the four factors. 4. Pavement material factors Asphalt and asphalt binder properties of asphalt pavement temperature cracking is the most important reason for the low temperature stiffness of asphalt mixture is to determine whether the cracking of asphalt pavement is the most fundamental factor, asphalt stiffness is determined asphalt mixture Stiffness of the key.
Deformation category
1. Rutting (1) surface layer and the grass-roots level will have an unstable laminated rut. (2) lane surface due to vehicle traffic, will produce vertical and horizontal rut, generally not deep, but easy to water, damage to the road. (3) grass-roots strength is not enough, poor water stability, so that the local subsidence caused by rutting. (4) surface layer is not enough compaction, porosity, traffic or in the corners, especially the overweight vehicles caused by the passage of the rut. (5) Asphalt concrete poor thermal stability, such as low softening point of asphalt, 60 ℃ viscosity difference, asphalt mixture of poor grades, too much asphalt, etc., in the summer high road temperature, easy to form rut.
