Navigational Lock, Florida

View of a typical navigational lock.
Wrapped samples couriered for testing.
Samples to be tested.
Deleterious hydration products in voids. (Petrographic analysis photo)
Deleterious sulfate deposits in voids. (Petrographic analysis photo)
Deleterious hydration products in voids of aggregate,
Initiation of deleterious hydration products in voids. (SEM photo)
Voids filled with deleterious hydration product. (SEM photo)
Accreted hydration product in voids.(SEM photo)
Deleterious hydration product filling a void. (SEM photo)

Evaluation of Concrete Samples

Navigational Lock, Kissimmee River, Florida

Concrete used in the construction of navigational locks on the Kissimmee River about 40 years ago has been damaged and in need of repair. Samples of concrete taken from Navigation Lock Structure S-65EBL were couriered to our laboratory and evaluated by several analytical methods including petrographic analysis.

Field inspection by client indicated this Lock and similar structures on the Locks’ chamber sections have been damaged below the normal waterline. The cement paste at the surface of the concrete walls have been weakened and aggregate have fallen out of the walls leaving many small craters on the surface of the walls.

Test performed in this study point to a sulfate attack occurring as deep as 10 inches into the concrete with an attendant reduction of compressive strength.