Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

In Korea, concrete pavements account for 66% of all pavements and Jointed Concrete Pavement (JCP) is the main one. Spalling of joints, which is a representative damage of JCP pavement, is threatening ride comfort, vehicle damage, and driver safety. There is an increasing interest in maintenance methods due to aging of concrete pavement. As a repair method for aged concrete pavement, the asphalt overlay method, which is advantageous in smoothness, noise, and construction period, is most often applied. However, pavement damages such as reflection cracking, shoving and pothole occur due to lack of adhesion between the existing concrete pavement and the new asphalt pavement. There is a need for a new method for preventing such pavement damage and extending the life of the pavement. In this investigation, an impermeable layer was applied on top of the existing JCP to reduce reflection cracking propagating from the bottom, increase adhesion with the existing pavement, and prevent penetration of rainwater and chlorides from the top. Thus, the durability of the pavement was secured and the lifetime of the pavement was extended at the same time. The impermeable layer is a thin sand mastic mixture(TSM) using a binder of PG88-34 with improved performance at low and high temperatures. In this study, the reflection cracking resistance, rutting resistance, and low-temperature bending strain of the TSM were evaluated through lab experiments, and field applicability was confirmed through test beds.