PLACING CONCRETE WITH BELT CONVEYORS

This state-of-the-art report includes a short history on the early development of conveyor belts for transporting and placing concrete. The design of conveyor systems is explained in relation to the properties of the plastic concrete, the delivery rate, and the job specifications. Bell widths, speeds, and angles of inclination are discussed as they apply to specific site requirements. The three types of concrete conveyors are the portable, feeder, and spreader types and their particular applications are covered. Field practices in the selection, use, and maintenance of conveyors are described. The economics of bell conveyor placement is discussed. The quality of the in-situ concrete and inspection procedures are emphasized.