2023 Volume 78 Issue 2 Pages I_309-I_315
In order to improve the waterproofness of concrete decks, the application of Guss-asphalt pavement, which has a thick waterproof layer and can omit the waterproofing work itself, is being considered for concrete decks. However, Guss-asphalt pavement is not versatile because it needs special construction machines. Therefore, on the premise of using a general paving machine, the authors have developed a construction method to construct asphalt pavement on site with high waterproof performance as well as that of gussasphalt. In this method, a large amount of thermoplastic resin waterproofing material is applied to the bridge deck in advance. After cooling to room temperature, the resin waterproof material is melted by the heat of paving the asphalt mixture, and the resin waterproof material is permeated and filled from the bottom of the asphalt mixture. In this paper, the air void ratio and water permeability of the developed method were compeared with an asphalt-based waterproofing material and a Guss-asphalt mixture. As a result, the optimal amount of resin waterproofing material is 2.0 kg/m2, and at this time, voids of the asphalt mixture at 20 mm from the top of the decks decreased to 1.0%. which is lower than that of the Guss-asphalt mixture.
