Principally regarding CIV obtained using the Standard 4.5 kg Clegg Hammer
For Pavement Design - CIV is similar in concept to the California Bearing Ratio (CBR). CIV may be used as an alternative to CBR in both laboratory and field on un soaked samples. CIV may be converted to a Clegg Hammer Modulus (CHM), analogous to an elastic modulus.
For Construction - CIV provides a means of process control by monitoring the effect of roller passes and checking variability. Percent compaction may be estimated by determining the CIV (termed an "As Compact Target CIV") needed to achieve the desired density level for the given material and field moisture content.
For Evaluation - CIV may be used to ensure adequate base course strength before sealing or proceeding with subsequent layers. It may also be used to monitor the effect of environmental changes and to investigate pavement failures.
Information - Information in the form of Papers, Reports, Technical Notes, Newsletters, etc. covering the theoretical basis, applications and correlation with other soil property tests such as "Proctor Density", Texas Class Number (TCN), Benkelman Beam, California Bearing Ratio (CBR), Falling Weight Deflectometer (FWD) and Modulus (Youngs or elastic Modulus) are available.
ASTM Standard for Impact Value (CIV)
D5874 - Standard Test Method for Determination of the Impact Value (IV).