Development of Plant-Mix-Type Modified Mixture with Excellent Flexibility and Stress Relaxation Properties for Ensuring High Resistance to Cracking

Over the past few years, in order to extend the service life of pavements, the authors developed a special asphalt mixture that adequately prevents the ingress of water from the foundation layer of the asphalt into the top layers. The highly flexible mixture with a premix-type modified asphalt has been applied on a road, and the mixture showed excellent cracking performance in serviceability. Since the highly flexible mixture uses a premix-type modified asphalt that is transported by an asphalt tanker truck, it is difficult to manufacture in small quantities for responding to small-scale and emergency constructions. In order to deal with this difficulty, the present study developed a plant-mix-type modified asphalt mixture using a special additive at the plant. The laboratory tests and field evaluation results indicated that both the premix-type asphalt mixture and the plant-mix-type modified asphalt mixture exhibited excellent flexibility and stress relaxation properties.