The current national highway construction after years of development, has begun to take shape, and still continue to expand the scale of construction. However, the problem of cracking at home and abroad asphalt pavement has yet to be solved well. The existence of the gap will cause the road within the frost heave, mineral erosion and peeling and other local damage, and ultimately will seriously affect the stability and safety of traffic, and will greatly reduce the service life of the road. The preventive maintenance of high-grade highways can effectively extend the service life of the road and ensure that it has good performance, which greatly reduces the overall maintenance cost of the road.
Types of cracks and causes of load cracks
Semi-rigid pavement structural damage cracks, mainly due to traffic load caused. Under the wheel load, the bottom of the semi-rigid base layer tensile stress, when greater than the semi-rigid base layer of tensile strength, the semi-rigid base of the bottom will soon crack. When the tensile stress is greater than the tensile strength of the semi-rigid base material, the bottom of the base layer will crack quickly. Under the repeated action of the load, the bottom of the cracks will gradually expand to the upper part of the asphalt concrete pavement cracking cracking. Chengdu to Chongqing through the south, then back to the highway, the daily traffic vehicles are relatively more along the route through the mountains, the downhill section is also more prone to load cracks.
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