Aggregates are continuously measured by volume in a continuous mixer. For controlling and determining the quantities of fine and coarse aggregates, devices such as counters and cut gates are employed. This paper presents the hatching accuracy of aggregates in the continuous mixer. A residual aggregate in the container and the operation of cut gate in an aggregate feeder of the continuous mixer do scarcely affect the quantity of aggregate and the accuracy in measuring and dispensing aggregate is within the required tolerances. With one measuring and dispensing equipment, coarse aggregates of maximum size with 40mm can be dispensed within ±3 percent of the amount required. The effects of moisture content and bulking factor of the fine aggregate, and grading of the fine and coarse aggregates on the quantities of aggregates supplied by the continuous mixer are also experimented.