ASTM C157/C157M − 08 Reapproved 2014 Standard Test Method for Length Change of Hardened Hydraulic Cement Mortar and Concrete

Scope of ASTM C157/C157M − 08 Reapproved 2014 Standard Test Method for Length Change of Hardened Hydraulic Cement Mortar and Concrete

1.1 This test method covers the determination of the length changes that are produced by causes other than externally applied forces and temperature changes in hardened hydraulic cement mortar and concrete specimens made in the laboratory and exposed to controlled conditions of temperature and moisture.

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

An exception is with regard to sieve sizes and nominal size of aggregate, in which the SI values are the standard as stated in Specification E11. Within the text, the SI units are shown in brackets.

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 nonconformance with the standard.

Significance and Use of ASTM C157/C157M − 08 Reapproved 2014 Standard Test Method for Length Change of Hardened Hydraulic Cement Mortar and Concrete

4.1 Measurement of length change permits assessment of the potential for volumetric expansion or contraction of mortar or concrete due to various causes other than applied force or temperature change.

This test method is particularly useful for comparative evaluation of this potential in different hydraulic cement mortar or concrete mixtures.