EN 13286-7:2004

Foreword
1 Scope
2 Normative references
3 Symbols and abbreviations
4 Principle
  4.1 Procedure for the study of the resilient behaviour
  4.2 Procedure for the study of permanent deformations
  4.3 Multi-stage procedure
5 Apparatus
  5.1 General
  5.2 Triaxial pressure chamber ('cell')
       5.2.1 General
       5.2.2 Chamber medium
       5.2.3 Top and bottom plate
  5.3 Loading device
       5.3.1 Method A - Variable confining pressure
       5.3.2 Method B - Constant confining pressure
  5.4 Pressure transducers
  5.5 Axial load transducer
  5.6 Response measuring equipment
  5.7 Other equipment
  5.8 Specimen cap and base
  5.9 Porous discs
  5.10 Semi-permeable filters
  5.11 Membrane
  5.12 Specimen-size measurement devices
  5.13 Balance
  5.14 Testing environment
6 Preparation
  6.1 General
  6.2 Set up of specimen and deformation measuring equipment
7 Test procedures for the study of the resilient behaviour
  7.1 Principle
  7.2 Method A: Variable confining pressure
      7.2.1 General
      7.2.2 Conditioning of the specimen
      7.2.3 Repeated loading for resilient testing
  7.3 Method B: Constant confining pressure
      7.3.1 General
      7.3.2 Conditioning of the specimen
      7.3.3 Repeated loading for resilient testing
8 Test procedures for the study of permanent deformation
  8.1 Principle
  8.2 Single Stage loading
      8.2.1 General
      8.2.2 Method A: Variable confining pressure
      8.2.3 Method B: Constant confining pressure
  8.3 Multi-stage loading
9 Test report
  9.1 General
  9.2 General data
  9.3 Conditioning of the specimen
  9.4 Resilient behaviour
  9.5 Permanent behaviour (single stage or multi-stage loading)
Annex A (informative) Measurement of specimen deformations
  A.1 Measurement system using LVDTs
  A.2 Measurement system using linear variable displacement
      transducers and rings with strain gages
Annex B (informative) Preparation methods
  B.1 General
  B.2 Specimen conditions
  B.3 Method 1 - Compaction by vibrocompression
  B.4 Method 2 - Compaction by vibrating hammer
Annex C (informative) Guidance on test procedures and ranking
                      of materials
  C.1 Purpose
  C.2 Experimental stress levels for permanent deformation tests
  C.3 Ranking of materials based on resilient behaviour tests
  C.4 Ranking of materials based on permanent deformation tests
      C.4.1 Procedure
      C.4.2 Interpretation
      C.4.3 Ranking
      C.4.4 Application
Annex D (informative) Suggested tables for presentation of test
                      results
Bibliography

This standard specifies two methods for determining the resilient and the permanent behaviour of unbound mixtures under conditions that simulate the physical conditions and stress states of these materials in layers beneath the surface layer of a pavement subjected to moving loads. The two test methods are provided according to the maximum size of particles: - Method A: The Variable Confining Pressure (VCP) method in which the cell pressure is cycled in phase with the axial load. This method applies to unbound mixtures in which all particles pass the 31,5 mm test sieve.