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Concrete in contact with seawater usually looks like this after a few decades.
But these Roman concrete breakwaters are 2000 years old...
The secret is in the Romans recipe for concrete.
Over time, seawater "corrodes" the mixture and forms new minerals.
These minerals help prevent cracks and boost the concrete's strength.
Unfortunately, the exact recipe for Roman concrete has been lost..
Concrete repair tips
Wire brush and shop vac repair area
Use concrete bonding adhesive over old concrete
Install Tapcons as anchors for new material
Speed up Tapcon installation with an SDS drill
Use Quikrete Quick-Setting Cement for concrete repair
Use a concrete edger to tool corners
Use a sponge to finish off the concrete patch