With the take-off of China's economy, more and more highway construction is being made. The smooth and spacious roads that everyone usually uses are actually inseparable from road maintenance. Ultra-thin asphalt overlay is a new type of highway maintenance technology, which is widely used in China's highway maintenance projects.
Ultra-thin asphalt overlays have many characteristics, not only their own excellent performance, but also bring convenience to construction projects. First of all, the ultra-thin asphalt overlay has good crack resistance, which can effectively reduce the transmission of cracks in the base layer and prevent cracks from reflecting to the surface of the pavement, thereby improving the durability of the road.
Secondly, the asphalt component in the ultra-thin asphalt overlay material has high permeability, which can well fill the cracks and voids of the base layer, prevent moisture from invading the road structure, reduce the permeability of the base layer, and prolong the service life of the road.
In addition, the ultra-thin asphalt overlay is made of high-performance asphalt concrete, which has high density and compressive strength, can withstand large traffic loads, and reduce vehicle wear.
In addition, the construction of ultra-thin asphalt overlay adopts hot mix or cold mix process, which does not require large equipment, which reduces the difficulty of construction and traffic impact.
Moreover, in the construction process of ultra-thin asphalt overlay, there is less waste, which is conducive to environmental protection. In addition, its lower thickness means less asphalt resource consumption.
Finally, the ultra-thin asphalt overlay is fast to apply and has less impact on traffic, helping to reduce traffic congestion. Since only part of the lane needs to be closed during the construction process, it will not have a serious impact on the entire road, avoiding long-term traffic congestion.
Although most of the time, ultra-thin asphalt overlays are used on roads, its "job prospects" are widespread. First, the ultra-thin asphalt overlay is suitable for urban roads, especially roads with large traffic flow and heavy load, which can effectively improve the service life of the road and reduce the frequency of maintenance. Second, for highways, speed and efficiency of construction are critical. The ultra-thin asphalt overlay can quickly complete the construction, reduce traffic congestion, and reduce the impact on driving safety. Thirdly, the ultra-thin asphalt overlay is suitable for the airport runway, which can meet the requirements of the wear resistance and slip resistance of the airport runway and prolong the service life of the runway. Fourth, ultra-thin asphalt overlay can be used for bridge pavement to improve the durability and crack resistance of the pavement layer.
Of course, not all pavements are suitable for ultra-thin asphalt coverings, and we also need to consider the following factors:
(1) Basic pavement conditions:The ultra-thin asphalt cover has high requirements for the foundation pavement, and if the foundation pavement is not in good condition, it may affect the overlay effect and service life.
(2) Construction conditions:Including construction environment, construction equipment, construction technology, etc., these factors will affect the construction quality and efficiency of ultra-thin asphalt overlay.
(3) Transportation needs:Traffic flow and load size directly affect the service life and performance of ultra-thin asphalt coverings, so they need to be weighed according to actual traffic needs.
(4) Budget and cost:Although ultra-thin asphalt overlays have the advantages of reducing costs and improving construction efficiency, long-term maintenance costs are high, and there is a trade-off between budget and cost.
At the same time, we also need to know that there are some precautions when using ultra-thin asphalt covering, and in order to prolong the service life of the overlay, our process in the construction of the overlay still needs to be refined. Therefore, we still need to do the following methods before and after construction in the future:
(1) Improve construction technologyIt is necessary to conduct comprehensive technical training for the construction team on a daily basis to ensure that they fully understand the construction process and precautions, and can skillfully operate advanced construction equipment. Through training, the skill level of construction personnel is improved, and the quality and efficiency of construction are improved. In addition, it is also necessary to introduce advanced construction equipment, such as automatic asphalt spreaders, road blowers, etc., to reduce manual operation and reduce risks and problems in the construction process.
(2) Optimize the basic pavement treatmentIt is usually necessary to carry out a comprehensive inspection and pretreatment of the foundation pavement. For the pavement that there is insufficient flatness and insufficient strength, take corresponding measures to improve, and at the same time, the pavement is compacted to improve the strength of the pavement to meet the requirements of ultra-thin asphalt overlay.
(3) Strengthen maintenance:According to the characteristics of ultra-thin asphalt overlay, a reasonable maintenance plan is formulated. After the construction of the cover is completed, the cover will be inspected and inspected regularly to find and deal with existing problems in time. For example, for problems such as pavement wear and cracks, corresponding maintenance measures should be taken in time to repair them. In addition, regularly maintain the covering, such as sprinkling water to cool down, removing debris, etc., to ensure the stability and service life of the covering.
(4) According to the performance of the ultra-thin asphalt overlay, reasonably plan the traffic flow and flow directionIn high-traffic sections, take measures to limit vehicle speed and reduce traffic congestion and wear and tear. In addition, the timing of traffic lights is optimized to improve traffic smoothness. At the same time, strengthen traffic safety management, improve drivers' traffic safety awareness, and reduce the occurrence of traffic accidents.
Ultra-thin asphalt overlay has significant advantages in reducing costs, improving construction efficiency, energy saving and environmental protection, however, ultra-thin asphalt overlay also has certain disadvantages. In practical application, highway maintenance still needs to weigh the advantages and disadvantages according to the specific situation, and reasonably select and use ultra-thin asphalt overlay technology.