THE TEXAS DOT SPECIFICATION FOR MITIGATING ASR

In the past, TxDOT relied on ASTM C 227, "Standard Test Method for Potential Alkali Reactivity of Cement-Aggregate Combinations (Mortar-Bar Method)" to screen for potentially reactive aggregates. However, in recent years, TxDOT identified several structures exhibiting early distress due to alkali-silica reactivity (ASR) even though the aggregates used in some of the members exhibiting ASR distress had "passed" the ASTM C 227 test. In other cases, mitigation measures (specified in Item 524, "Hydraulic Cement") using a low alkali cement and substituting a portion of the cement with a fly ash containing no more than 1.5 percent available alkali, were not sufficient to prevent ASR from occurring. This paper describes the new TxDOT specification for mitigating ASR.

  • Supplemental Notes:
    • Full conference proceedings available on CD-ROM.
  • Corporate Authors:

    University of Texas, Austin

    International Center for Aggregates Research, 3208 Red River
    Austin, TX  United States  78705-2650

    Texas A&M University, College Station

    Faculty Exchange Box H
    College Station, TX  United States  77843
  • Authors:
    • Lankes, G D
    • Lukefahr, E J
    • Won, M
  • Conference:
  • Publication Date: 2001

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 13p

Subject/Index Terms

Filing Info

  • Accession Number: 00983576
  • Record Type: Publication
  • Report/Paper Numbers: Final Draft
  • Files: TRIS
  • Created Date: Dec 27 2004 12:00AM