a concrete chute apparatus for preventing the accidental discharge of cement residue from the chute of a cement truck while the truck is moving is disclosed . to attain this , an abutment plate obstructs the opening of a cement truck caused by the folding of an articulated chute . in an embodiment , an abutment plate is rigidly affixed to an over - chute section of the articulated chute such that the plate obscures the concrete path when the over - chute section is rotated to the up position .