CR 13901:2000

1 Introduction
  1.1 Introduction to production control
  1.2 Introduction to conformity control
  1.3 EN 206-1
  1.4 General
2 Background
  2.1 Uncertainty
  2.2 Variability of test data
  2.3 Systematic changes in concrete quality
  2.4 Speed of response to changes in concrete quality
  2.5 Variability in standard deviation
3 The use of concrete families in production control
  3.1 The basic concept
  3.2 Principles applicable to all systems
  3.3 Selecting the family
  3.4 Satisfying the specifying
  3.5 Coping with specials
4 The use of concrete families in conformity control
  4.1 Procedure for conformity
  4.2 Assessment of relationships
  4.3 Derivation of the confirmation criterion
5 Discussion
6 Conclusions
7 References
Appendix A: Examples of the use of the concept of concrete families
  Example 1: Concrete family containing aggregates of different
             sizes and cem ii-v cement
  Example 2: Concrete family concept with product specification
             based on performance as applied in the Netherlands
  Example 3: Conformity control of a concrete family containing
             different amounts of fly ash
  Example 4: All concretes made with cem i cement and 30% fly ash
  Example 5: Concrete family containing data from a number of
             plants using the same materials
Appendix B: Example of the effect on the standard deviation
            when data are transposed and pooled

The report gives guidance how to apply the concept of concrete families for the production and conformity control of concrete as it is introduced in prEN 206 and provides a survey how this concept is applied in different CEN member countries.