Once the asphalt mixture has been properly mixed at the plant, it must be transported to the track and field venue following strict guidelines to ensure the quality of the asphalt concrete base layer. This process is crucial for maintaining the integrity and performance of the final surface.
The asphalt mixture is typically unloaded automatically during transport. Before loading, the interior of the transport truck must be thoroughly cleaned to remove any dirt, sand, or debris that could contaminate the material. A small amount of an oil-based release agent (a mixture of oil and water in a 1:3 ratio) should be applied to the sides of the truck bed. It's important that no excess liquid remains at the bottom of the compartment, as this could affect the consistency of the mix.
Transport vehicles are equipped with dust covers or tarps to prevent contamination from external elements. In colder weather, additional insulation or a thermal cover is used to maintain the temperature of the asphalt during transit. The weight of each vehicle should generally be between 15 and 20 tons. This is because track and field facilities often have narrow pathways and drain covers that make it difficult for heavy or large vehicles to enter the site safely.
The unloading hopper must be designed to avoid being too high or too wide, which could cause the material to spill over the paver’s edge. Before starting each paving operation, at least five trucks should be on-site ready to unload. This helps reduce waiting times and keeps the paving machine running smoothly without unnecessary stops.
Upon arrival at the construction site, each transport vehicle must provide a delivery note that includes details such as the vehicle number, type of asphalt mixture, specifications, weight upon arrival, factory-mix temperature, and the name of the construction location. At the end of each workday, the last truck must submit a complete material list along with the grading certificate of the asphalt mixture and the oil-to-aggregate ratio results for the day. These documents serve as official records of the construction process and are essential for quality control and project documentation.
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