This Standard sets out the method for the following:

(a) The calibration of the density system of a nuclear surface moisture-density gauge using standard density blocks. The calibration equation, so derived, defines the relationship between the density count ratio and field density for direct transmission measurement (see Notes 1 and 2).

NOTES:

1 A nuclear surface moisture-density gauge calibrated in accordance with this method may also be used for the determination of the field density of asphalt in accordance with AS 2891.14.1.1.

2 When the density and moisture systems operate independently, a gauge may be used to measure only one variable (either density or moisture).

(b) The partial calibration of the moisture system of a nuclear surface moisture-density gauge using standard moisture blocks. The calibration equation, so derived, defines the slope of the moisture calibration equation. The intercept of the moisture calibration equation for each particular material is determined from actual measurements of field moisture content, as detailed in AS 1289.5.8.1.