ABSTRACT
The essential steps in the construction of asphalt pavements consist of selecting proper materials and conducting a proper mix design, ensuring drying and mixing of aggregates from properly maintained stockpiles, mixing aggregates with asphalt binder, delivering the mix in insulated trucks in a smooth way so as to match with paver speed, laying down with a paver, and using a properly selected combination of rollers of desirable weight and type, with correct vibration frequency and/ or tire pressure, in a correct rolling pattern. The rollers should be close to the paver and operating with desirable speed and manner of reversing and turning. All of the equipment should be in good operating condition. And, very importantly, good quality control must be ensured at every step in the plant and during laydown and rolling operations. There must be clear communication of any problems between the plant and the site, and if required, adjustments should be made in mix design, plant production, transportation, and laydown and rolling operations. Provisions should be made to use additives in the materials, such as natural rounded sand to reduce the harshness of a mix, and/or employ special equipment, such as a material transfer vehicle to reduce temperature-related segregation, if required.
