Method of and device for improving the quality of fresh concrete and preventing adhesion and hardening of the fresh concrete in a mixer drum of a concrete mixer truck or of a concrete mixing plant

DETAILED DESCRIPTION A principal object of this invention is to provide a method of improving the quality of fresh concrete and preventing adhesion and hardening of fresh concrete on a plurality of rotary blades and around an inner periphery of a mixer drum of a concrete mixer truck and/or of a concrete mixing plant.
Cold or warm air is selectively and continuously delivered into the rotary mixer drum to maintain the temperature of the fresh concrete at a required temperature range, to delay the hardening time of the fresh concrete and to extend the delivery range thereof.
Another object of this invention is to provide a device for improving the quality of fresh concrete and preventing adhesion and hardening of fresh concrete on a plurality of rotary blades and around an inner periphery of a mixer drum of a concrete mixer truck and/or of a concrete mixing plant.
Cold or warm air is selectively and continuously delivered into the mixer drum to maintain the temperature of the fresh concrete within a required temperature range, to delay the hardening time of the fresh concrete and to extend the delivery range thereof.
Another object of this invention is to provide a method for improving the quality of fresh concrete and preventing adhesion and hardening of fresh concrete on a plurality of rotary blades and around an inner periphery of a mixer drum of a concrete mixer truck and/or of a concrete mixing plant.
Cold or warm air is continuously delivered into the mixer drum to maintain the temperature of the fresh concrete at a required low temperature range, to delay the hardening time of the fresh concrete and to extend the delivery range thereof.
Another object of this invention is to provide a device whereby long distance transportation of the fresh concrete can be carried out easily without deteriorating the quality of fresh concrete and preventing adhesion and hardening of the fresh concrete on an inner periphery of a mixer drum of a concrete mixer truck and/or of a concrete mixing plant.
Another object of this invention is to provide a device whereby the amount of time for transporting the fresh concrete in the rotary mixer drum can be increased for as long as possible without using a concrete mixing relay base