Delay and reduce the semi-rigid basement asphalt concrete surface of the load-type cracks and non-load-type cracks, two types of methods can be used: First, during the construction of the corresponding use of the prevention of cracks or treatment measures, the second is in the maintenance and maintenance of appropriate Of the overlay system. usually. In the case of conditions, for the best results,chip spreader market
these two methods can be used synthetically. This article only from the semi-rigid base asphalt pavement crack prevention or treatment of each side to elaborate.
Improve the strength and stability of the roadbed work area
The subgrade is the foundation of the road. The roadbed work area is the depth area where the roadbed is subjected to the influence of the traffic load. The depth and the overall stability of the subgrade are extremely important to ensure the strength and stability of the pavement structure. Otherwise,instant asphalt repair
The settlement causes the road to crack. Therefore, it is necessary to take effective measures to deal with the key aspects of the stability and strength of the roadbed work area, and to minimize the settlement of the subgrade after completion.
1. The strength of the roadbed work area is mainly formed during the filling process. Must strictly control the roadbed filling process, to ensure the roadbed strength. Filling materials preferred stone, gravel, sand soil, followed by the choice of gravel, sand low liquid limit clay, again selected low liquid limit clay. Silty soil and organic soil can not be used to fill the roadbed. The heavier the vehicle load, the greater the depth of the roadbed work area. In the roadbed design, the vehicle load is considered by the standard rated shaft, when the road is completed,rubberized asphalt for sealing cores of shrinking soil
the depth of the roadbed work area is already a fixed shape. After the road is delivered, when the vehicle is overloaded on the road. The depth of the roadbed work area will increase. Due to overload. The actual depth of the roadbed work area beyond the default depth, so that the untreated part of the roadbed strength, stability, stiffness is obviously insufficient, in actual use, the road surface will produce cracks, subsidence, rutting, deformation is too large Disease. Therefore, in the face of the current highway overload phenomenon is very common, I suggest that the roadbed construction of the subgrade work area of the depth of control is better than the roadbed work area design depth to prevent trouble.
2. Compaction degree is an important index to reflect the strength of subgrade, but also the most economical and effective technical measure to improve the strength and stability of roadbed. The construction must strictly control the control. Make it reach the specified value. The thickness of the fill layer has a direct impact on the degree of compaction, the construction of the plug hanging line,surface of dry concrete repair
the thickness of each layer of pine should not be greater than 30 cm. Check the degree of compaction test pit to hit the top of the next layer, all the test results can not reach the specified value to be pressurized, or remove the re-fill.
3. Reducing the groundwater level is an important measure to improve the strength of the roadbed. The 80 cm roadway below the bottom of the road is a key part of the roadbed,sealer concrete machine usa
which directly absorbs and absorbs the diffusion stress on the road surface, with sufficient strength and stability. When the excavation found under the seepage, regardless of the size of the flow should be dealt with. Fill the land to use a better material to fill, poor soil lots to be filled for processing to ensure its strength and stability.
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