Discussion of 'Evaluating the Relationship between Permeability and Moisture Damage of Asphalt Concrete Pavements' by Rafiqul A. Tarefder and Mohiuddin Ahmad

摘要

The authors have presented a very interesting study (Tarefder and Ahmad 2014) that presents in situ field permeability data as well as laboratory permeability data on field core samples from asphalt concrete pavements. Field data are always nice to see, and the authors should be congratulated for publishing them. The discussers would like to make the following comments. The pavements studied by the authors are multilayered, making the situation quite complex and, further, making it difficult to isolate the relevant factors affecting moisture damage. Fig. 8(c) in the paper shows that the tensile strength ratio (TSR) decreases with permeability. The question of whether the TSR correlates with moisture damage will depend on several factors, in particular whether the water can drain away.