ASTM C918/C918M − 13 Standard Test Method for Measuring Early-Age Compressive Strength and Projecting Later-Age Strength

ASTM C918/C918M − 13 Standard Test Method for Measuring Early-Age Compressive Strength and Projecting Later-Age Strength

Scope
1.1 This test method covers a procedure for making and curing concrete specimens and for testing them at an early age.

The specimens are stored under standard or accelerated curing conditions and the measured temperature history is used to compute a maturity index that is related to strength gain.

1.2 This test method also covers a procedure for using the results of early-age compressive-strength tests to project the potential strength of concrete at later ages.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Combining values from the two systems may result in non-conformance with the standard.

ASTM C918/C918M − 13 Standard Test Method for Measuring Early-Age Compressive Strength and Projecting Later-Age Strength

Terminology
3.1 Definitions:
3.1.1 Refer to Practice C1074 for the definitions of the following terms: datum temperature, equivalent age, maturity, maturity function, maturity index, and temperature–time factor.

3.2 Definitions of Terms Specific to This Standard:

3.2.1 potential strength, n—the strength of a test specimen that would be obtained at a specified age under standard curing conditions.