Why is strict control necessary during mixture production and placement?

Strict control during mixture production and placement is essential to guarantee the expected performance of the hot mix asphalt. This involves ensuring that the mixture is produced according to specified design criteria and that it meets quality standards throughout the production and placement processes.

When the production and placement of HMA are tightly controlled, it helps in achieving the desired properties of the asphalt mix, such as durability, resistance to deformation, and overall longevity of the pavement. Variations in the mixture’s components or improper handling during placement can lead to issues like cracking, surface wear, or inadequate bonding with underlying layers, which ultimately affect performance and the lifespan of the asphalt pavement. By maintaining strict adherence to the defined parameters, including temperature, mix components, and compaction efforts, the likelihood of a high-performing end product is greatly increased. This ensures that the pavement performs well under traffic and environmental stresses, thus fulfilling its designed purpose effectively.