: How do nails hold when driven into concrete?

Question

I understand how nails obtain their pullout resistance in fibrous materials like wood, but I see workers driving nails through wood into concrete. How does the cement prevent pullout?

In: Engineering

Answer 1

Nails in concrete almost never need to hold pressure that pulls them outwards but pressure that pulls them in a 90° angle downwards. And now the pressure themselves into the concrete hole they are in.