PURPOSE: To automate the process of loading a mixture stored in a mixture silo onto a truck.

CONSTITUTION: A transfer device 8 is provided below a mixture silo in which an asphalt mixture is stored to move a truck 6 back and forth. In addition, a location detecting sensor 16 is properly arranged to detect the stop position of the truck 6 entering a mixture, loading area 7. The position detecting sensor 16 is operated for the truck 6 which stops at the mixture loading area 7 at the time of mixture loading to detect the stop position of the truck 6 and the size of the loading platform 15 so as to determine an optimum mixture loading pattern based on the position and the size of the loading platform 15 and the loading quantity. Based on this pattern, the transfer device 8 is controlled to move the truck 6 properly, automatically loading the mixture on the truck 6.