ASTM D3744/D3744M−11a Standard Test Method for Aggregate Durability Index

ASTM D3744/D3744M−11a Standard Test Method for Aggregate Durability Index

Scope
1.1 This test method covers the determination of a durability index of an aggregate.

The calculated durability index is a value indicating the relative resistance of an aggregate to production of detrimental clay-like fines when subjected to the prescribed mechanical methods of degradation.

1.2 Units—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 nonconformance with the standard.

1.2.1 Measurements of volume and mass are only given in SI units because they are the only units typically used in practice when performing this test method.

ASTM D3744/D3744M−11a Standard Test Method for Aggregate Durability Index

Significance and Use
4.1 This test method assigns an empirical value to the relative amount, fineness, and character of clay-like material that may be generated in an aggregate when subjected to mechanical degradation.

4.2 The procedure has been used in limited geographical areas of the United States and the results have been correlated with aggregate performance in various construction applications, including: aggregate base, permeable material for backfill, fine concrete aggregate, and riprap for rock slope protection.3,4