7.2.3 Aggregate Spreading
Basic aggregate spreading is provided by a hopper mounted on the truck tailgate. The spread rate is controlled by the gate opening and truck speed. Greater control over the spread rate is obtained with metering rollers built into the spreader, or by using self-propelled spreaders that include a receiving hopper that transfers aggregate to the metered spreader.
Aggregate spreaders can be calibrated to determine the required settings to achieve the desired spread rate for a particular aggregate source. This is usually undertaken at the stockpile site prior to work commencing.