Abstract
Cold Patching Asphalt Mixture(CPAM) has been widely used in pothole repair due to the advantages of convenient construction and easy storage. However, CPAM usually has a short service life because of insufficient bonding to the old pavement during service. Therefore, in order to ensure the good bonding of CPAM to the old pavement and improve the integrity and durability of pothole repair, this work carried out a study on the influencing factors of the bonding characteristics between CPAM to the old pavement. The oblique shear test was used as the research method with an evaluating index shearing strength. Influencing factors which affect the interface bonding characteristics, such as temperature, humidity, types of tack coat, the amount of tack coat spreading and surface roughness, were compared and analyzed. The analysis results illustrated that the interface bonding characteristics are weak at high temperature and decreases with the increase of humidity. There exists an optimal binder spreading amount where the denser CPAM is, the smaller the spreading amount of the tack coat is. The groove on the old pavement can increase the bond strength of the interface, but there is an optimal groove spacing. Based on this, the gray correlation analysis method was used to clarify the influence degree of various factors and reveal the dominant factors affecting the interface bonding characteristics. The analysis indicated that the dominant influencing factors of the interface bonding characteristics are the type of tack coat and the roughness of the surface.
Highlights
A pothole is a common type of damage in asphalt pavement (Adlinge and Gupta, 2013; Kim and Ryu, 2014; Kim et al, 2017; Ouma and Hahn, 2017)
Tack Coat The tack coat was daubed onto the interface between the pothole and the old pavement before repair in order to wet the pothole so that Cold patching asphalt mixture (CPAM) could be well-bonded with the old pavement overall
At the time of the research, most of the tack coat used between CPAM and the old pavement are asphalt materials
Summary
A pothole is a common type of damage in asphalt pavement (Adlinge and Gupta, 2013; Kim and Ryu, 2014; Kim et al, 2017; Ouma and Hahn, 2017). Potholes seriously affect the driving comfort and safety, shorten the life of the pavement, and reduce the service level of the pavement. The pavement should be repaired in a timely fashion after potholes appear (Dong et al, 2014; Zhang et al, 2014; Wang et al, 2015; Tedeschi and Benedetto, 2017). The bonding performance between them seriously affects the service life and the durability of CPAM (Rosales Herrera and Prozzi, 2008; Tan et al, 2014; Rezaei et al, 2017)
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