The SDI Multistrand Systems were developed from the ground up to address today's design and construction practices, including the use of lightweight, high-strength concrete mixes and the need for compact HDG coated anchorages in structural elements with congested reinforcing steel. The system is extensively tested and performance-proven on major civil engineering projects worldwide, including precast and cast-in-place segmental bridges, nuclear containment structures and offshore drilling platforms requiring expertise and innovative ideas.

SDI furnishes comprehensive material supply and installation services for post-tensioning projects worldwide. The system hardware incorporates numerous technical advances that simplify field placement, stressing and grouting and includes a broad range of anchor heads, bearing plates and encapsulation features for 1 to 61 0.6-inch diameter strand tendons. Combined with SDI's continuous commitment to research and development, the SDI Post-Tensioning System provides a practical, fully-integrated solution for construction of segmental bridges, offshore drilling & storage structures, nuclear containments, and other civil engineering structures.

The focus for bridge and concrete structure designers and fabricators for the New Haven Peral Harbor Bridge was multi-fold:

Supply their customers with bridges and concrete structures that last a minimum of 100 years. Due to the expense of building a bridge combined with the related costs for the disturbance of traffic and commerce it is critical that bridges provide long, safe service life. Therefore corrosion protection and durability are key components of this primary focus. The corrosion protection provided by HDG is a perfect fit for these goals.

Low Cost Maintenance/Life Cycle Costs Communities want bridges to be in service for long periods of time and without costly, time consuming, traffic flow reducing maintenance. The HDG coated bearing plates in the post-tensioning system had an average coating thickness of 7 mils. The HDG coating life expectancy of these bearing plates exceeds the target set by the designers. Encased in concrete, the HDG bearing plates will not require any maintenance for decades.

Sustainability At the end of life, all of the materials need to be recyclable. The zinc coated steel bearing plates will be 100% recyclable at the end of their service life.

Handling the construction of a bridge or similar concrete structure is a harsh environment. The HDG bearing plates do not require special handling. HDG meets and exceeds all of these important criteria. Once the tensioners are in place they cannot fail for the life of the bridge. The HDG coating will provide performance and peace of mind for decades to come.

Remain durable in the temperant marine combined with industrial environment of the bridge location.

HDG meets and exceeds all of these important criteria. Once the tensioners are in place they cannot fail for the life of the bridge. The HDG coating will provide performance and peace of mind for decades to come.