I'll add that is is quite easy to get the CNT to disperse in an admixture. The real problem is getting the admixture to evenly disperse into the concrete in the truck. When the amount of CNT is very small relative to the overall mix (10-300g/tonne) you have to have extremely careful mixing to ensure even dispersion. Cement trucks are not precision mixing devices.
Ann: CDOT Central 70 Project Update, page-109
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