Overview
ABSTRACT
This article deals with the prescriptions of concretes, the roles of the different actors, and the drawing up of control programmes. The various types of concretes are described, according to Standard NF EN 206/CN. The liabilities of all the parties are explained. Information is given for the prescription. The main tests to characterise the properties of fresh concrete are briefly reviewed. The classification of facing is presented. Means to codify facing quality are explained. The main steps in a control programme are set out, and a focus on initial validation of concrete compositions is given.
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Michaël DIERKENS: Technical Advisor Concrete Materials - Cerema, Centre-Est Lyon Laboratory Department (Bron, France)
INTRODUCTION
European standard NF EN 206/CN defines the tasks of the specifier, producer and user of concrete. With their roles perfectly defined, each of them seeks to develop the tools they need to meet the essential requirements imposed by the European Community, as well as their own requirements. The specifier (project manager) will be responsible for specifying the concrete to be used, the producer (concrete manufacturer) will be responsible for concrete conformity and production control, while the user (contractor) will be responsible for placing the material in the structure. Each party is responsible for transmitting its requirements to the next link in the chain, and the final compilation of these requirements results in the specification. In addition, this "concrete" standard specifies the general requirements applicable to concrete constituents, the rheological characteristics of fresh concrete, the mechanical and durability characteristics of hardened concrete, the mix design and its suitability for use, and the conditions for assessing conformity. The purpose of this text is to clarify all these requirements in the light of practical site conditions.
At the end of the article, readers will find a glossary of important terms and expressions, as well as a table of acronyms, notations and symbols used throughout the article.
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KEYWORDS
building | Concrete | Civil engineering | standardization | standardisation | hydraulic concrete
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Concrete quality – Standard requirements
Quality of use and specifications
Bibliography
Other references
- Résistance du béton dans l'ouvrage. La Maturométrie. Guide Technique. - Techniques et méthodes des laboratoires des Ponts et Chaussées. Nancy (2003).
Also in our database
Standards and norms
- Concrete – Specification, performance, production and compliance – National supplement to standard NF EN 206. - NF EN 206/CN, ANFOR - décembre 2014
- Fresh concrete tests – Part 2: sag test. - NF EN 12350-2, AFNOR - avril 2012
- Fresh concrete tests – Part 3: Vébé test. - NF EN 12350-3, AFNOR - avril 2012
- Fresh concrete tests – Part 4: Clamping index. - NF EN 12350-4, AFNOR - mars 2012 (tirage 2) ...
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