LOS ANGELES (CBSLA.com) – Chunks of the old Sixth Street Viaduct were handed out Saturday.

The structure is in the process of being demolished. Keepsakes were distributed near the structure’s west end.

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(Photo by Kevork Djansezian/Getty Images)

There were enough souvenirs for about a thousand people. They were given away as bands played and food trucks served up hot dishes and cold beverages. There was also a booth explaining the science behind the alkali-silica reaction that doomed the old viaduct. The chemical reaction causes concrete to expand and crack.

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Souvenir chunks of the old viaduct ranged in size, but most were no bigger than a softball. They’re accompanied by certificates of authenticity.

The new bridge will be completed in 2019.

The new 6th Street Bridge will feature wide pedestrian walkways and a design that honors its predecessor.

The new 6th Street Bridge will feature wide pedestrian walkways and a design that honors its predecessor.

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