concrete-bridges-1

concrete-bridges-1

Farshad Rajabipour prepares to add aggregate to a concrete mixer.

In the Civil Infrastructure Testing and Evaluation Lab at Cato Park, Farshad Rajabipour prepares to add aggregate (crushed rock) to a concrete mixer. The aggregate is dark because it has been soaked in water, one step in a new practice of internal curing of concrete to improve its strength, durability and service life.

IMAGE: Curtis Chan