ASTM C1646/C1646M − 08a Standard Practice for Making and Curing Test Specimens for Evaluating Resistance of Coarse Aggregate to Freezing and Thawing in Air-Entrained Concrete

ASTM C1646/C1646M − 08a Standard Practice for Making and Curing Test Specimens for Evaluating Resistance of Coarse Aggregate to Freezing and Thawing in Air-Entrained Concrete

Scope

1.1 This practice covers procedures for making and curing test specimens for evaluating resistance of normal

weight coarse aggregates to freezing and thawing in air-entrained concrete in accordance with Test Method

C666/C666M, Procedure A or B.

1.2 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 C1646/C1646M − 08a Standard Practice for Making and Curing Test Specimens for Evaluating Resistance of Coarse Aggregate to Freezing and Thawing in Air-Entrained Concrete

Significance and Use

4.1 This practice provides standard requirements for evaluating coarse aggregate in air-entrained concrete

subjected to freezing and thawing in accordance with Test Method C666/ C666M.

4.2 Concrete having an adequate air-void system may not be resistant to freezing and thawing if it contains

coarse aggregate that becomes critically saturated. An aggregate particle is considered to be critically saturated

when there is insufficient unfilled pore space to accommodate the expansion of water that accompanies the

freezing.