ASTM C311

Sampling and Testing Coal Ash or Natural Pozzolans for Use in Concrete

Applicability: ASTM C311 specifies the test methods used to evaluate whether fly ash, natural pozzolans, or other supplementary cementitious materials (SCMs) are suitable for use in hydraulic cement concrete, mortar, or grout.

Purpose: ASTM C311 provides the standard test methods for sampling and testing fly ash or natural pozzolans to determine their suitability for use as a mineral admixture in concrete. Its purpose is to ensure that these materials meet the requirements of the ASTM C 618 specification, which covers their chemical and physical properties. Key tests include the strength activity index test to measure strength development and other tests to assess properties like water demand and loss on ignition.