Method for repairing and constructing thin overlay of cement concrete road pavement

Abstract

The invention discloses a method for repairing and constructing a thin overlay of a cement concrete road pavement. The method comprises the following steps: 1) mechanically cutting parallel V-shaped grooves on a used cement concrete pavement; 2) cleaning dirt reserved on the surface of the pavement and positions to be dropped after the V-shaped grooves are cut mechanically; 3) coating or spraying a pre-coating agent on the used cement concrete pavement processed by the step 1) and the step 2) so as to form a pre-coating layer; 4) drying the surface of the pre-coating layer, and then coating a mortar binding agent on the surface of the pre-coating layer to form a mortar binding layer; and 5) casting a new cement concrete overlay layer after the surface of the mortar binding layer is dried and before cement in the mortar binding layer is subjected to initial setting. According to the method, the binding strength between the used cement concrete pavement and the newly casted cement concrete shield layer is improved obviously, the new and old cement concrete pavements can be adhered into a whole, the maintaining quality of the cement concrete pavement is improved greatly, and the continual service life of the cement concrete pavement is prolonged greatly.

Description

technical field [0001] The invention belongs to the technical field of highway maintenance and cement concrete engineering, and in particular relates to a construction method for repairing a thin-layer overlay of highway cement concrete pavement. Background technique [0002] Highway cement concrete pavement has many advantages such as high strength, water damage resistance, stable performance, low daily maintenance cost, long service life, saving driving fuel consumption, etc., and has broad development and application prospects. But for the subsidence section of road cement concrete pavement, the repair method in the past is: first all excavate the concrete pavement of the subsidence section, fill up the subsidence part on the base, and then relay the new cement concrete pavement. Obviously, this requires a long construction period, seriously affects the normal operation of the road, and wastes resources. The waste cement and concrete blocks need to be piled up in another ...

AI Technical Summary

Problems solved by technology

Obviously, this requires a long construction period, seriously affects the normal operation of the road, and wastes resources. The waste cement and concrete blocks need to be piled up elsewhere, occupying valuable ground space and causing secondary pollution to the environment.

Therefore, repairing the pavement in this way obviously requires a lot of materials and labor, and the maintenance cost is high

[0003] In order to reduce the maintenance cost of the subsidence section of the cement concrete pavement subgrade, many people try to repair it with a thin layer of cement concrete, but the result is that the thin layer of the overlay will break and fall off soon, because the new thin layer of new cement concrete It is not firmly bonded to the original old cement concrete pavement, and it is easy to disengage and fall

Therefore, the bonding problem of the old and new cement concrete slabs is a key technical problem that has not been successfully solved until now when the ultra-thin cement concrete overlay is used for the repair of old cement concrete pavements.

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