Research Report Approved: Feb 10, 1989

C0311/C0311M-Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete

The purpose of this report is to report estimates of single-operator (i.e. within laboratory) precision and multilaboratory (i.e. between laboratory) precision, as defined in paragraphs 6.2 and 6.3 of ASTM C 802- 87, for the proposed pozzolanic-activity-with-cement test that has been under development in ASTM C09.03.10. Data were derived from the results of two interlaboratory studies. These studies are the last two in a series of five and were conducted with the method in its currently proposed form. The first three studies were developmental, consequently do not represent the currently proposed form and were not useful for precision estimates. Part 4 of the interlaboratory study was completed in 1987; Part 5 was completed in 1988. The data were analyzed according to ASTM C 802-87. The precision statement was prepared according to ASTM C 670-87. Part 4 of the interlaboratory study included three fly ashes: a Class C fly ash, a Class F fly ash, and an unclassified Class F fly ash. The latter material was know
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