If roman concrete was shown to have self-healing capabilities, why isn’t it used with modern reinforcement techniques?

Question

As the title suggests. If roman concrete supposedly has the capabilities to mend tiny cracks via chemical reaction, why isn’t it used with modern reinforcements to seal the pathways to the steel beams to protect it from oxygen and elements and prevent corrosion? Are there any major downsides to hot-mixed concrete, is it not as good as the studies make it out to be, or is it simply not viable due to cost and manufacturing process/storage requirements?

In: Engineering

Answer 1

Because the exact formulation used was lost for about 2000 years. Only recently have chemists be able to replicate the formula used by the Romans. One of the big items was volcanic ash.

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