scope:

These methods cover the determination of (1) the resistance to deformation of compacted HMA mixtures by measuring the lateral pressure developed from applying a vertical load by means of the Hveem stabilometer; and (2) the cohesion of compacted bituminous mixtures by measuring the forces required to break or bend the sample as a cantilever beam by means of the Hveem cohesiometer.²

The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of R 18 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with R 18 alone does not completely assure reliable results. Reliable results depend on many factors; following the suggestions of R 18 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.