LOL. You really think tradies are doing proper controlled scientific tests?
There is so much batch to batch and intra-batch variability in concrete that it is extremely difficult to determine whether any effect is anything other than chance. eg If you take 100 samples from the same truck you will get as much as 50% variation in strength. In fact recent scientific studies suggest that most of the benefits of CNT reinforcing can't be reliably achieved outside carefully controlled laboratory conditions.
is this going to help EDE at last?, page-68
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