A method of overlaying to prolong the service life of airport composite pavement
A composite road and airport technology, which is applied to the coagulation pavement, roads, roads and other directions of on-site paving, can solve the problems of low service life of airport composite road, design life, great differences in mechanical properties, asynchronous deformation and changes, etc. Achieve the effect of preventing deterioration and damage, reducing the difference in mechanical parameters, and avoiding stress concentration
Active Publication Date: 2020-12-18
XUZHOU UNIV OF TECH
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Problems solved by technology
According to the existing research, the reasons why the service life of the airport composite pavement is lower than the design life are: ① There are joints and cracks in the old cement concrete pavement, which lead to stress concentration at this position. When the stress at a certain point of the asphalt concrete layer When the strength limit is exceeded, it will reach a state of destruction; ②Since cement concrete and asphalt concrete respectively exhibit rigidity and flexibility, when the two are combined, various mechanical properties are very different. Under the influence of conditions, there will be asynchronous deformation changes, which will eventually lead to its deterioration and destruction
Method used
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Experimental program
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Effect test
Embodiment Construction
[0017] The present invention will be further described below.
[0018] Concrete steps of the present invention are:
[0019] A. First observe the number of cracks on the cement concrete pavement of the airport, and then use ground penetrating radar to detect the bottom of each crack, and then determine the defect position and defect volume after each crack extends to the interior of the cement concrete pavement, as Provide basis for repairing the foundation;
[0020] B. Drill a foundation repair hole in the middle of each crack distribution to the respective extended defect position, and determine the depth of the foundation repair hole according to the defect position obtained in step A, and at the same time according to the foaming ratio of type A polyurethane and step A The volume of each defect obtained determines the injection volume of type A polyurethane in each crack;
[0021] C. The injection volume of type A polyurethane obtained according to step B is respectively...
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The invention discloses an overlaying method for prolonging the service life of an airport composite pavement. The overlaying method for prolonging the service life of the airport composite pavement comprises the steps of firstly, obtaining a crack distribution situation of the surface of an airport pavement; secondly, finding a foundation defect position generated by crack extending so that a foundation defect can be preferably repaired and a good foundation condition can be provided for the airport composite pavement; and injecting B type polyurethane into cracks so that the expansion process can generate an under-pressure effect. The crack repairing effect of the airport cement concrete pavement is better, the generation of stress concentration of the airport composite pavement is fundamentally avoided, and the stress on asphalt concrete overlay can be more uniform. Two polyurethane middle layers are arranged between the airport cement concrete pavement and the asphalt concrete overlay so that the mechanical parameter difference of an adjacent layer is reduced; and the asphalt concrete overlay can also be very well bonded so as to furthest reduce asynchronous deformation changeof the airport composite pavement under the effect of conditions such as temperature and aircraft dynamic load; and finally, the service life of the airport composite pavement is effectively prolonged.
Description
technical field [0001] The invention relates to an overlaying method for prolonging the service life of an airport composite pavement, and belongs to the technical field of airport pavement restoration. Background technique [0002] Because the pavement structure of most airport runways is single, about 95% of the pavement is cement concrete structure. The normal use of airport runways mainly depends on its structural performance. With the continuous increase of civil aviation traffic, the load capacity of various aircraft has also increased significantly, and the rapid increase in the number of take-offs and landings per day at airports has caused more and more serious effects of repeated loading and unloading on the runway surface of the airport. In addition, the impact of ambient temperature, Cracks develop inside the cement concrete pavement of airport runways, resulting in various forms of damage, the main manifestations of which are: cracks, deformation, joint damage ...
Claims
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IPC IPC(8): E01C7/14
CPCE01C7/147
Inventor 王圣程姜慧朱炯禄利刚刘晴王艳杨捷赵众
Owner XUZHOU UNIV OF TECH