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 78705-2650Texas 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:
- International Center for Aggregates Research 9th Annual Symposium: Aggregates - Concrete, Bases and Fines
- Location: Austin, Texas
- Date: 2001-4-22 to 2001-4-25
- Publication Date: 2001
Language
- English
Media Info
- Features: Figures; References; Tables;
- Pagination: 13p
Subject/Index Terms
- TRT Terms: Aggregates; Alkali silica reactions; Cement; Pavement distress; Reactive aggregates; Specifications
- Geographic Terms: Texas
- Subject Areas: Geotechnology; Highways; I36: Aggregates;
Filing Info
- Accession Number: 00983576
- Record Type: Publication
- Report/Paper Numbers: Final Draft
- Files: TRIS
- Created Date: Dec 27 2004 12:00AM