Company:

FORTA Corporation

Project:

Lanai Breakwater Core-Loc Dolos

Location:

Lanai, Hawaii

The relatively small island of Lanai, Hawaii, depends heavily on the Kaumalapau Harbor for tugboat and barge deliveries for all commercial goods. The Kaumalapau Harbor needed 800 Core-Loc dolos to protect its breakwaters and shore. The durable concrete used in Core-Loc dolos creates a strong, interlocking unit with high stability and relatively low cost. However, the significant heat of hydration produced during mass concrete placement of the Core-Loc dolos presented a challenge.

To help eliminate cracking, the approach included applying several inches of insulating foam to the steel form exterior prior to concrete placement, the use of a 60/40 ratio of chilled water to ice, and the inclusion of FORTA-FERRO macrosynthetic reinforcing fibers at a dosage rate of 5 lbs/yd3. In total, the project required 70,000 pounds of FORTA-FERRO to reinforce 14,000 cubic yards of concrete. It has been honored with several national and regional project awards for its remarkable innovation and solutions to challenging construction issues.