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Concrete that is arranged for supply from a central plant rather than mixed on the construction site is referred to as ready mixed. Each batch of ready-mixed concrete is manufactured to the contractor's specifications and delivered to him in a plastic state, commonly in cylindrical vehicles known as "cement mixers."

 

Ideal for Many Jobs

When modest quantities of concrete or irregular concrete placement are needed, ready-mixed concrete is especially beneficial.

Ready-mix concrete is divided into three categories:

Materials for transit-mixed (also known as truck-mixed) concrete are batched at a central plant and thoroughly mixed in the truck as it travels. Frequently, the concrete is only partially mixed while in transit, and the remaining mixing takes place on the project.

The water is kept separate from the cement and aggregates throughout transit, allowing the concrete to be mixed shortly before being placed on the job site. This procedure avoids the difficulties of early stiffening and slump failure that might occur when central-mixed concrete is transported or placed late. Furthermore, transit-mixing enables concrete to be transported to construction sites that are further away from the facility. Yet, one problem of transit-mixed concrete is that its truck load is less than that of a truck holding central-mixed concrete.

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When ready-mixed concrete reaches on the worksite, it is frequently blended to get the desired slump. Concrete which has been remixed, on the other hand, tends to set faster than concrete that has only been combined once.