A method for sealing cracks in airport cement concrete pavement

Abstract

The invention discloses a method for blocking cracks of an airport cement concrete pavement. The method comprises the steps that firstly, liquid nitrogen is slowly injected in the extension direction of the cracks till the cracks are filled with the liquid nitrogen, and washing for the cracks is completed through liquid nitrogen gasification; water is sprayed and injected to the cracks, still standing is conducted, and then a covering device is adhered to the airport cement concrete pavement where the cracks are located; solid particle materials are sent into the cracks through the pneumatic transmission process, and after the cracks are filled with the solid particle materials, water is injected into the cracks in a fine water mist mode; and the solid particle materials are expanded and solidified after 180 min-200 min, the airport cement concrete pavement is polished to be flat through a concrete polishing machine, and skidproof stripes are carved, that is, blocking of one crack is completed. Through inspection of practical application, the method can achieve omni-directional blocking for the cracks of the airport cement concrete pavement, restoring for the micro-fine cracks can be completed, the blocking effect is better, the blocking rate of the cracks is increased by 50% or above, take-off and landing safety of an aircraft is guaranteed, the service life of the airport pavement is prolonged by 30-50%, and the wide practicability is achieved.

Description

technical field [0001] The invention relates to a method for sealing cracks, in particular to a method for sealing cracks on airport cement concrete pavement. Background technique [0002] The pavement structure of Chinese airport runways is relatively simple, and the cement concrete pavement structure accounts for about 95%. The normal use of the airport runway mainly depends on its structural performance. With the continuous increase of air traffic volume, the continuous increase of aircraft load, and the continuous increase of aircraft daily flight sorties, the load effect on the airport runway is also increasing. In addition, the temperature factor Due to the coupling effect of the airport runway cement concrete pavement, internal cracks develop, resulting in various forms of damage, which are mainly manifested as: cracks, deformation, joint damage and surface damage. In order to ensure the safety of aircraft take-off and landing and prolong the service life of the airp...

AI Technical Summary

Problems solved by technology

Therefore, the mechanism of action of inorganic repairing materials on cracks mainly depends on the bonding and penetration of cement hydration products, so that cement paste and old concrete are bonded together to seal and repair cracks; inorganic repairing materials also have a lot of Defects, such as insufficient bonding strength, are prone to cracking under large impact forces; after repair, the pavement will be raised and affect the smoothness of the pavement; in terms of groutability, it is still different from other types of repair materials. There is a certain gap. Generally, it can only be injected into the gap or crack with a diameter or width greater than 0.2mm, and it is impossible to complete the repair of tiny cracks between 0.1mm-0.2mm.

② Use organic polymer materials to seal the cracks. After the organic polymer materials are poured into the cracks of the pavement through polymers, polymerization reactions occur during the curing process, and the concrete aggregates are bonded together by chemical bonds or van der Waals forces to achieve filling. 1. The purpose of plugging concrete cracks; the initial viscosity of organic materials is low, but the problem is that the shrinkage rate after curing is also large, generally around 20%, and it is easy to separate from the repair matrix concrete or produce a large Internal stress makes the repair fail

③A polymer material compounded with organic materials and inorganic materials is used to seal the cracks, in which a layer of cross-linked polymer network can be formed in the cement-based material, which adheres to the mortar, thereby preventing the expansion of micro-cracks; polymer particles can be filled Some of the larger pores in the cement mortar have changed the pore structure and enhanced the adhesion between the cementitious material slurry and the old mortar and concrete, but it still cannot effectively seal the tiny cracks, which bury safety hazards for aircraft take-off and landing

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