Corrugations and shoving

The only effective treatment for corrugations and shoving is to remove the deficient asphalt from the whole affected area and replace it with well-designed and properly produced asphalt, avoiding the use of cut-back for tack coating. 

In case of local shoving, remove the affected area and patch it. 

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Distortions may take one of the following forms (a) rutting, (b) corrugations and shoving, (c) local depressions or (d) upheaval. Figure 15.12 shows schematically the different forms of surface distortion. 

Corrugations and shoving are ripples formed in the longitudinal direction of the asphalt pavement surface (Figure 15.12c) owing to plastic displacement of the asphalt. When the plastic displacement is local, the distress is called just shoving. 

Hot applied mastic asphalt floors have been used for many years in industrial environments, where a good degree of chemical resistance under normally wet conditions is required. Properly laid mastic floors are totally impervious to a wide range of chemicals but not solvents. In terms of mechanical performance, mastic asphalt floors are similar to the bitumen-modified cementitious floors, but they are generally laid at a minimum of 25 mm thickness and tend to shove and corrugate in service under heavy loads. Mastic floors are not very commonly used now, except where the floor is essentially tanked, such as car park decks over shopping precincts. 

Prerequisites for repave is that the pavement (a) should not show premature surface deformation (rutting, shoving and corrugations) caused by asphalt deficiency in deformability and (b) should not show extensive fatigue cracking. 

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