Work Item
ASTM WK96775
Revision of C1260-23 Standard Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method)
Rationale
The proposed revision is to extend the measurement period to 28 days by adding required readings at 21 and 28 days after immersion. Many specifications already reference 28 day expansion limits for assessing potential ASR. Extending the duration to 28 days aligns the test procedure. The additional data points provide a more complete characterization of the aggregate reactivity, especially for slowly reactive materials where 14 day results may not fully capture long-term behavior.
Work Item Status
Date Initiated: 10-23-2025
Technical Contact: Thano Drimalas
Item: 000
Ballot:
Status: