Yes they do work by van der Waal forces but during testing for flexural strength the load result at point of fracture can be significantly double that of the control concrete batch.
Following is an example from a research paper.
-Research Article Carbon Nanotube Effect on the Ductility, Flexural Strength, and Permeability of Concrete Hindawi Journal of Nano-materials Volume 2019, Article ID 6490984, 11 pageshttps://doi.org/10.1155/2019/6490984
Can you provide evidence for your second paragraph and a comparison cost bases using increased amounts of portland cement. This would help your argument.
Granted they don't own the CNT patent for concrete, but they cover the IP for its formulation as an admixture were CNTs are evenly dispersed and suspended in a water/sufactant mixture with a long shelf life.
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