2. Manufacturing control

All the minimum production control procedures for concretes intended for cast-in-place structures, precast structures, precast structural elements for buildings and civil engineering structures, whether manufactured on site, in ready-mix plants or precast plants, are governed by paragraph 9.9 of standard NF EN 206/CN. These operations come under the concrete producer's internal control, and the checks carried out mainly concern :

• constituent materials ;

• manufacturing equipment ;

• production procedures ;

• concrete properties.

Test and verification results must be documented in reports or, failing that, recorded. They can be requested or consulted by the prescriber and/or the project manager as part of his external...