Apparatus and method for adding pigmentation to concrete mix

Apparatus for adding pigmentation material to a concrete mixture, comprising:

• a hopper for containing the pigmentation material and having a bottom wall;
• a lower horizontal rotor with flighting positioned adjacent the bottom wall of the hopper and having opposite first and second ends;
• an upper horizontal rotor with flighting positioned in the hopper above the lower rotor;
• an outlet opening adjacent the first end of the lower rotor;
• a cleanout opening adjacent the second end of the lower rotor, the cleanout opening being normally closed to prevent pigmentation material from exiting through the cleanout opening;
• a drive system to rotate the upper and lower rotors;
• the drive system being adapted to rotate the lower rotor in opposite first and second directions for moving the pigmentation material towards the outlet and cleanout openings, respectively;
• a conveyor below the outlet opening for carrying the concrete mixture and receiving the pigmentation material discharged through the outlet opening;
• the conveyor having a discharge end;
• a concrete mixer adjacent the discharge end of the conveyor for receiving the concrete mixture and pigmentation material from the conveyor and for mixing the concrete mixture and pigmentation material together.