top of page

Lee Roy Selmon Extension

Tampa, FL

Award: Lower Carbon Concrete

Project Team

Owner: Tampa Hillsborough Expressway Authority

Contractor: Kiewit

Concrete: CEMEX

Slag Cement: Lehigh Hanson

In this project the slag cement was used to meet the durability requirements outlined in Section 346 of the FDOT bridge specification. This project is in an extremely aggressive environment that is subject to salt water. Slag cement was beneficial to early strength performance to turn formwork for the casting beds. It was also used to help control heat generation for mass concrete elements.

The precast segment portions of this project were steam cured to help achieve early strength requirements to keep the project on schedule. A 50% slag cement replacement rate contributed to an overall lower carbon concrete.

This was an FDOT infrastructure project in Tampa that extended an existing highway approximately 2 miles elevated over an existing corridor in a high-volume traffic area. This project contains architectural features as well as high strength (8500 psi) pre-casted segments that were cast in the CEMEX ready mix staging yard and then transported to the jobsite.

Application Type

% Slag Cement Replacement


% Portland Cement


% Portland Limestone Cement

% Other SCM (if applicable)


Florida Limestone (#67)

Water/cement ratio


7-day strengths


28-day strengths

>8500 psi


bottom of page