EN 12697-31:2007

Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
  3.1 Terms and definitions
  3.2 Symbols
4 Principle
5 Apparatus
  5.1 Test device
  5.2 Metallic moulds
  5.3 Round metallic inserts
  5.4 Device for measuring the distance between inserts
  5.5 Device for counting the number of rotations to within
      one revolution
6 Preparation of specimens
  6.1 Mass of mixture to be introduced in the mould
  6.2 Preparation of test pieces
7 Test procedure
  7.1 Preliminary setting
  7.2 Compaction
8 Test report
9 Precision
Annex A (normative) Procedure for setting the angle and
        force for types of gyratory compactor using central
        reference material
  A.1 Scope
  A.2 Principle
  A.3 Gyratory-type testing procedure
  A.4 Procedure to test the conformity of a gyratory compactor
      to a type
  A.5 Summary of the gyratory calibration chain
Annex B (normative) Procedure to evaluate the gyratory
        compactor internal angle of gyration using a
        self-contained measurement unit
  B.1 Scope
  B.2 Principle
  B.3 Equipment
  B.4 Procedure
  B.5 Calculation
  B.6 Compliance
  B.7 Report
  B.8 Precision data
Annex C (normative) Procedure to evaluate the gyratory (GC)
        internal angle of gyration and related parameters
        using simulated loading
  C.1 Scope
  C.2 Principle
  C.3 Procedure
  C.4 Calculation of results
  C.5 Compliance
  C.6 Report
  C.7 Precision and bias
Bibliography

This European Standard specifies the method for compaction of cylindrical specimens of bituminous mixtures using a gyratory compactor. Such compaction is achieved by combining a rotary shearing action and a vertical resultant force applied by a mechanical head.The method is used for:a)determination of the air voids content of a mixture for a given number of gyrations or derivation of a curve density (or void content) versus number of gyrations;b)preparation of specimens of given height and/or at a predetermined density, for subsequent testing of their mechanical properties.The equipment used for the method needs to comply with Annex A, Annex B or Annex C.NOTEAnnex A is especially suitable for void content evaluation and compaction research and Annex B and Annex C for the preparation of specimens for mechanical testing.This European Standard applies to bituminous mixtures (both those made up in laboratory and those resulting from work site sampling), with an upper aggregate size not larger than 31,5 mm.