Dive summary:

• It is hard to get much traction in bridge construction when you are the only one who makes a product, which is the case for the hybrid composite beam, a glass-reinforced plastic box that has steel fibers along its bottom and is filled with concrete and used like conventional beams, but the inventor says there is "a subculture of engineers, owners and contractors that really do like the concept of change."
• The beam has been used in projects in 11 permanent installations – three of them in Missouri in a federally assisted bridge-repair program – and inventor John Hillman crews have tried three methods with equal success: filling the beams after they have been put in place, filling them at a staging area and then lifting, and shipping them from the factory with the concrete in place.
• A Missouri DOT engineer says the installation was as easy as it was supposed to be, but shipping is expensive and the claimed longer life than conventional materials is a matter of wait-and-see.

From the article:

HCB's patented, proprietary nature means it isn't likely to gain American Association of State Highway and Transportation Officials acceptance into bridge design code as an alternative to standard materials.