Leeds
No. Retarders use pressure created within the engine to lessen the speed of a vehicle.
Some vehicles have retarders which help slow a vehicle, reducing the need for using your brakes. They reduce brake wear and give you another way to slow down. There are many types of retarders (exhaust, engine, hydraulic, electric). All retarders can be turned on or off by the driver. On some, the retarding power can be adjusted. When turned "on," retarders apply their braking power (to the drive wheels only) whenever you let up on the accelerator pedal all the way.
It slows down the drying time
Engine brake retarders (found usually on commercial vehicles) are intended to inhibit the camshaft's turning, which, in turn, slows down the turning of the driveshaft, which, in turn, slows the rotation of the tires, which, in turn, slows the vehicle down. This is the system commonly known as the "Jake brake".
Engine compression and exhaust retarders.
Retarders are classified as type B or type D chemical admixtures for portland cement concrete in ASTM Designation C494. Their primary function is, as the name implies, to retard the setting time of concrete.
We have no way of showing diagrams. Sorry.
To eliminate the posibility of cold joints.
A retarded is either an engine compression brake, and exhaust compression brake, or a system which combines the two.
Initial Setting time can be extended by adding retarders during mixing of concrete. Sugar solution is the easily available retarder.
Usually busses do not have retarders because they are too loud and cannot be used inside most city limits on a semi truck they have a switch to turn on the jake brake (engine brake, or retarder) when the switch is on and you let the accelerator all the way up the brake takes over. All a retarder does is use your air brakes (or hydraulic) less to prevent overheating that will lead to brake loss.