Ready-mixed concrete is manufactured in concrete plants. The various components, accurately metered, are poured into a mixer, mixed and stirred, before being, in turn, dumped into the mixer truck which continues the mixing during the transfer to the place of delivery.

The transport of fresh concrete to the place where it is poured uses mixer trucks equipped with a rotary concrete mixer called router, whose capacity is 4 to 12 m3. By its composition, concrete is a fresh product. It must be implemented quickly and its transport time is limited, otherwise it will start.

The concrete is delivered on site:

• By a directional gutter: the chute of the top into which the concrete is poured and delivered to the desired place if it is close to the parking place of the truck.

• By a treadmill. This type of delivery is particularly suitable for unloading distances of about 10 meters with a height of up to 6 meters. The advantages are less arduous, ease of implementation, time saving and transport and delivery of concrete by a single material.

• By a pump: these pumps allow the concrete to be transported to the pour point for hard-to-reach areas. The truck with a concrete pump is equipped with a telescopic boom that can be steered up to 35 meters. The duration of transport limited according to the ambient conditions of temperature, hygrometry or wind at 1 h 30 maximum. The use of retarders and plasticisers solves the decline in handling. The implementation after his arrival on the site must be done in 30 minutes maximum. To avoid the introduction of foreign bodies and the mixing of different concretes, the rotors must be cleaned frequently.