NBN EN 480-11 : 2005

Foreword
1 Scope
2 Normative references
3 Definitions
    3.1 Air void
    3.2 Total air content A
    3.3 Paste Content P
    3.4 Specific surface of air void system alpha
    3.5 Spacing factor L
    3.6 Air void distribution
    3.7 Micro air content A300
    3.8 Traverse line
    3.9 Length of traverse Ttot
    3.10 Chord length l
    3.11 Chord length classification
4 Principle
5 Equipment
    5.1 General
    5.2 Specimen preparation
    5.3 Microscopical analysis
6 Specimen production and preparation
    6.1 Specimen production
    6.2 Preparation of test surface
7 Microscopical procedure
    7.1 Basic procedure
    7.2 Values recorded
8 Calculation
    8.1 Data obtained
    8.2 Total traverse length
    8.3 Total air content
    8.4 Total number of chords measured
    8.5 Specific surface of the air
    8.6 Paste: air ratio
    8.7 Spacing factor
    8.8 Micro-air content
    8.9 Air void distribution
          8.9.1 Basis of calculation
          8.9.2 Calculation of chord frequency
          8.9.3 Calculation of void frequency
          8.9.4 Calculation of void distribution
          8.9.5 Calculation of air content
          8.9.6 Presentation of results
          8.9.7 Column contents
9 Test report
Annex A (informative) Theoretical basis of calculations
involved in Table 1
Annex B (informative) Worked example of the calculation of
air void distribution

Defines a test method for determination of the air-void structure in a hardened concrete sample which contains entrained air.