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 specification
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