NEN EN 771-1 : 2011 + A1 2015

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Materials and manufacture
5 Requirements for clay masonry units
  5.1 General
  5.2 LD-units
      5.2.1 Dimensions and tolerances (LD units)
      5.2.2 Configuration (LD units)
      5.2.3 Density (LD units)
      5.2.4 Compressive strength (LD units)
      5.2.5 Thermal properties (LD units)
      5.2.6 Durability (LD units)
      5.2.7 Water absorption (LD units)
      5.2.8 Active soluble salts content (LD units)
      5.2.9 Moisture movement (LD units)
      5.2.10 Reaction to fire (LD units)
      5.2.11 Water vapour permeability (LD units)
      5.2.12 Bond strength (LD units)
  5.3 HD units
      5.3.1 Dimensions and tolerances (HD units)
      5.3.2 Configuration (HD units)
      5.3.3 Density (HD units)
      5.3.4 Compressive strength (HD units)
      5.3.5 Thermal properties (HD units)
      5.3.6 Durability (HD units)
      5.3.7 Water absorption (HD units)
      5.3.8 Initial rate of water absorption (HD units)
      5.3.9 Active soluble salts content (HD units)
      5.3.10 Moisture movement (HD units)
      5.3.11 Reaction to fire (HD units)
      5.3.12 Water vapour permeability (HD units)
      5.3.13 Bond strength (HD units)
6 Description, designation and classification of clay
  masonry units
  6.1 Description and designation
      6.1.1 LD units
      6.1.2 HD units
  6.2 Classification
7 Marking
8 Evaluation of conformity
  8.1 General
  8.2 Initial type tests
  8.3 Factory production control
      8.3.1 General
      8.3.2 Raw materials
      8.3.3 Production process
      8.3.4 Finished product test
      8.3.5 Traceability
Annex A (normative) Sampling for initial type testing
         and for independent testing of consignments
  A.1 General
  A.2 Sampling procedure
      A.2.1 Random sampling
      A.2.2 Representative sampling
      A.2.3 Dividing the sample
      A.2.4 Number of units required for testing
Annex B (informative) Additional information
  B.1 The use of clay masonry units
  B.2 Durability
  B.3 Freeze/thaw resistance
      B.3.1 General
      B.3.2 Masonry subjected to severe exposure
      B.3.3 Masonry subjected to moderate exposure
      B.3.4 Masonry subjected to passive exposure
  B.4 Sulfate action on mortars and plasters
  B.5 Efflorescence and staining
  B.6 General guidance on the appearance of facing clay
      masonry units
Annex C (normative) Determination of water absorption
Annex ZA (informative) Clauses of this European standard
         addressing the provisions of the EU Construction
         Products Directive

Defines the characteristics and performance requirements for masonry units manufactured from clay for which the main intended uses are protected or unprotected masonry structure (e.g. facing and rendered masonry, loadbearing or non-loadbearing masonry structures, including internal linings and partitions, for building and civil engineering).