The necessity of shot blasting on bridge deck

The necessity of shot blasting on bridge deck

Bridge surface asphalt concrete surface shedding, pits and passages are the main early failure forms of bridge deck pavement. The main reason for such diseases is that the interlayer adhesion and the interlayer shear resistance between the bridge deck asphalt concrete and the bridge deck cement concrete slab have not been effectively exerted.

(1) The bridge deck cement concrete slab has a low strength and contaminated floating slurry layer. In the construction of the bridge deck cement concrete pavement layer, due to the process of vibrating and ramming, sizing and grouting, the cement concrete The surface of the cement mortar float layer or strip is thick and uneven, which is rich in fine aggregates, and its strength is usually low. And due to the influence of the field environment of the bridge, a large number of scattered Dust will cause different degrees of pollution on the cement concrete surface, thus affecting the interlayer bonding of the pavement.

The weak floating slurry layer will directly affect the adhesion between the bridge deck cement concrete slab and the subsequent bridge deck waterproof layer or modified emulsified asphalt adhesive layer. The contaminated surface will block the interlayer adhesion, which will affect the overall adhesion .

(2) The effect of the roughness of the cement concrete slab of the bridge deck. The roughness of the interface between the layers has a direct effect on the sliding stability between the layers. The roughness of the larger structural depth is beneficial to enhance the shear resistance between the layers Cutting performance is a key factor affecting the road performance of bridge deck pavement.

(3) The high efficiency of shot blasting to deal with the floating slurry on the bridge deck, no pollution on the job site, no additional cleaning work is needed for the cleaned bridge deck.