Why re­place the 6th Street Viaduct?

Los Angeles Times - - THE NATION -

When the 6th Street Viaduct was built in the 1930s, the use of im­ported peb­bles and sand led to an is­sue called al­kali-sil­ica re­ac­tiv­ity. ASR, as it is known, oc­curs when ce­ment and ag­gre­gate (rock and sand) re­act in the pres­ence of wa­ter. Mod­ern con­crete avoids this process by us­ing spe­cial ad­di­tives in the con­crete.

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