Cracked Case: TxDOT, Harris County Try to Manage ASR

This article profiles efforts made by the Texas Department of Transportation (TxDOT) to manage alkali-silica reactivity (ASR), which preys on bridges. Activities in Harris County, Texas, are given as a case study. ASR is prevalent in Texas due in large part to roll off from the Rocky Mountains and the residual effects of Texas having been an ocean floor thousands of years ago. Although TxDOT knew it needed to start investigating ASR as early as the 1990s, it was not until 2009 that the most extreme case of ASR surfaced. This happened when the Harris County Toll Authority discovered cracking in the fourth bridge in a network of ten bridges. TxDOT response is examined. Mitigation strategies, which included use of Class F fly ash and a water sealant, were designed to treat every aggregate as if it were highly reactive.


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Filing Info

  • Accession Number: 01150651
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 12 2010 10:00AM