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LA 1 Port Allen Bridge Replacement

Location: Port Allen, Louisiana

Award: Infrastructure

Project Team

Contractor: Kiewit

Concrete: Quality Concrete

Slag Cement: Holcim

The LA 1 Bridge Replacement in Port Allen, LA, USA, will help alleviate traffic congestion on LA 1 that occurs due to the close proximity of I-10. This is Phase 1 of the Louisiana Department of Transportation and Development’s (LA DOTD) plan to help with traffic in the Baton Rouge area. The bridge is elevated over the industrial canal that leads to the Mississippi River. It was constructed to allow enough height for barges and large ships to pass underneath.

Slag cement was used as a 50% replacement for portland cement for several reasons on this project. Most of the 25,000 yd3 (19,000 m3) of the project is mass concrete. Also, LA DOTD requires surface resistivity specifications to be met on all mass and structural concrete that is placed in the state. Slag cement was an integral part of the mixture design to meet surface resistivity requirements.

The concrete placements took place at night using chilled water from a central mix plant due to the high temperatures in South Louisiana. LA DOTD specifications require concrete to be delivered at 90°F (32°C) or below.

Application Type

% Slag Cement Replacement


% Portland Cement

% Portland Limestone Cement


% Other SCM (if applicable)



Water/cement ratio


7-day strengths

4500 psi

28-day strengths

6000 psi


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