Both a concrete plant with ready-mix drum trucks and volumetric concrete mixer produce quality concrete however, there are some distinct advantages to choosing a volumetric mixer.
i. Customer only pays for exactly what they need: Because the VCM is in essence a mobile concrete batching plant if the customer needs a little more or a little less then what they originally thought it is not a problem because production stops when the job is done. With Ready-mix drum trucks the customer has to make an accurate estimate of what is needed because it is batched and water is added at the plant then delivered to the site.
ii. Concrete is ALWAYS Fresh: With a VCM the concrete is made fresh every second as it is being produced so the newest concrete is what is being laid. With concrete from a drum truck the concrete coming out last is the oldest and may already be stiff.
iii. Small quantities are not a problem: With a VCM you can produce as little as a quarter of a cubic meter or yard of concrete and then pack up and go to another job. With traditional drum trucks, this becomes almost impossible and very uneconomical. After a small load, the drum truck also has to return to the plant to reload for the next job.
iv. Multiple mixes in one stop: With a VCM the operator can do a variety of concrete mixes in one stop. For instance, perhaps a sidewalk had to be removed to get at some utilities. A VCM could then produce some fill concrete to cover the utilities and bring the grade to underside of sidewalk slab height. Then the slab could be formed up and the VCM could produce the correct concrete for the sidewalk slab as well without have to return to the job site.
v. Time is not a factor: With a VCM the problem of time does exist. Concrete in a delivered in a drum truck is exposed to water at the plant and is now perishable and the time to get it delivered and into position is less than 2 hours. With a VCM you can deliver concrete an infinite distance away. With a VCM you can be stuck in traffic and still deliver fresh concrete to the customer. With a VCM delays on the job are much less stressful.
vi. Evenings and Weekends: To open a traditional batch plant after hours or on the weekends can cost thousands of dollars and require a minimum quantity of concrete to be ordered. With a VCM anytime and any day is just like any other.