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Heading: 1.1concrete roping, balls in concrete, doing flatwork
What should a contractor do when they pour a slab and theres a ball in the concrete?

How can a mix plant prevent this from happening?

What causes this to happen?

Sarah Wittenauer

This can be caused by several things, but hey are usually out of control of the contractor. If concrete gets to the job and it has cement balls, all you can do is pull them out.

Usually this problem is related to the order in which materials are placed into the mixer. Truck mixers are more notorious for this problem. Usually the charging order for the materials is"

Coarse aggregate
Fine aggregate
50% of the water
Cement + 40% of the water
Remaining 5-10% of the water, depending on hold-out.

Of course the problem can also be caused by blade wear or very dry concrete.

I'm not a producer, so some people may have better suggestions for charging order.

Jay Shilstone
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