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Work Item

ASTM WK95855

Revision of C1945-24e1 Standard Specification for Raw or Calcined Natural Pozzolan for Use in Concrete

Rationale

This proposed revision to ASTM C1945 maintains the requirement to determine replicate fineness values in accordance with ASTM C311, but clarifies that the average fineness value shall be report only. The intent is to preserve the statistical integrity of the test method by requiring multiple determinations, while simplifying reporting to reflect the practical use of the data in uniformity and compliance assessments. By specifying the average as report only, the revision eliminates the potential for misinterpretation of minor variation between replicates—variation that is expected within the precision of the test method. This change aligns the reporting format with the performance-focused objectives of the standard.

Details

Developed by Subcommittee: C09.24

Committee: C09

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 07-28-2025

Technical Contact: Adam Williamson

Item: 000

Ballot: 

Status: 

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