CEN TR 16912-2016 Guidelines for a procedure to support the European standardization of cements.pdf

1、Guidelines for a procedure to support the European standardization of cementsPD CEN/TR 16912:2016BSI Standards PublicationNational forewordThis Published Document is the UK implementation of CEN/TR 16912:2016.The UK participation in its preparation was entrusted by TechnicalCommittee B/516, Cement a

2、nd lime, to Subcommittee B/516/6, Cementspecifications.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The Briti

3、sh Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 90913 9ICS 91.100.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the authority of theStandards Policy and Strategy Committee on 30 June 2

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16、g142g142g3g148g139g137g138g150g149g3g145g136g3g135g154g146g142g145g139g150g131g150g139g145g144g3g139g144g3g131g144g155g3g136g145g148g143g3g131g144g134g3g132g155g3g131g144g155g3g143g135g131g144g149g3g148g135g149g135g148g152g135g134g3g153g145g148g142g134g153g139g134g135g3g136g145g148g3g6g8g17g3g144g13

17、1g150g139g145g144g131g142g3g16g135g143g132g135g148g149g484g3g21g135g136g484g3g17g145g484g3g6g8g17g512g23g21g3g883g888g891g883g884g483g884g882g883g888g3g8PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 2 Contents Page European foreword . 3 Introduction 4 1 Scope 5 2 Normative references 5 3 Terms and defin

18、itions . 5 4 Procedure of application and standardization of a new cement . 5 4.1 General information on standardization processes . 5 4.2 Classification of new cements . 5 4.3 General criteria for the assessment of new cements . 6 4.4 Application for the standardization of a new cement 6 4.4.1 Gene

19、ral 6 4.4.2 The dossier and its contents . 7 4.5 Evaluation and decision by CEN/TC 51 . 7 5 Assessment of fitness for use 8 5.1 Meaning of “fitness for use” . 8 5.2 Elements of the assessment of fitness for use . 8 5.3 Characteristics of the new cement which are relevant to its fitness for use . 8 5

20、.4 Methods for the assessment and verification of the relevant product characteristics 11 5.4.1 General . 11 5.4.2 Constituents and composition of the cement . 11 5.4.3 Durability aspects 12 5.4.4 Environmental aspects . 13 5.4.5 Possible health impact . 14 6 Patents and other intellectual property

21、rights (IPR) relevant for the standardization of the new cement 15 Bibliography . 16 Tables Table 1 Categorization of new cements and the corresponding requirements 6 Table 2 Product characteristics of a new cement that may be relevant to its fitness for use . 9 Table 3 Characterization of constitue

22、nts . 12 PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 3 European foreword This document (CEN/TR 16912:2016) has been prepared by Technical Committee CEN/TC 51 “Cement and building limes”, the secretariat of which is held by NBN. Attention is drawn to the possibility that some of the elements of this do

23、cument may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 4 Introduction The willingness to improve construction products leads to the optimization of existing cements as well as to the devel

24、opment of new binders. Improvement may concern in particular the performance of the products, the reduction of production costs or the lowering of the environmental impact. With regards to the environment, a fundamental policy objective of the European Union is to encourage/incentivise a reduction i

25、n CO2emissions within a framework of sustainable development. Cement manufacturers are reducing their specific CO2emissions e.g. by the production of cements with a lower clinker content. At the same time, the expectations of contractors, ready-mixed concrete producers and precast concrete manufactu

26、rers should also be met by maintaining high levels of performance in cements and in the durability of concrete. Existing cement standards, in particular EN 197-1, allow manufacturers to select cement compositions with low clinker content, i.e. CEM III/B and C, CEM IV/B, CEM V. However, these cements

27、 are often used for their good resistance to chemically aggressive environments but do not necessarily achieve, in concrete, the early age strength required where formwork is to be removed at less than 24 h. Maintaining performance, in particular early strength and durability related characteristics

28、, while reducing specific CO2emissions by the development of new types of cement is expected to be one of the main challenges of the coming years. When considering such new cements intended to be used to produce structural concrete the question arises whether these products should be covered by Euro

29、pean Standards or by European Technical Assessments (ETAs). For an answer, the various EU policy documents referenced in the bibliography should be considered, in particular the “Council Conclusions on standardization and innovation (Brussels, 25 September 2008)” 7 which highlight “the essential con

30、tribution which standardization can make towards developing innovation and competitiveness, by facilitating access to markets, enabling interoperability between new and existing products, services and processes, enhancing protection of users, giving consumers confidence in innovations and disseminat

31、ing research results”. CEN and CENELEC have responded to all the EU initiatives and adopted, in October 2008, an integrated approach titled “Standardization Innovation and Research (STAIR)”. From this common approach of the EU and CEN, it is clear that European standardization may cover innovation.

32、An application to standardize a new cement should be submitted to the Technical Committee CEN/TC 51 based on a dossier introduced by the applicant who may, according to CEN/CENELEC Internal Regulations Part 2:2015 14, be a national standardization body (CEN Member), a CEN Technical Committee, the EU

33、 or EFTA Secretariat, an international organization or an European trade, professional, technical or scientific organization. It is essential that all applicants are aware in advance of the information they should provide to CEN/TC 51 in the dossier in order to demonstrate the fitness for intended u

34、se of the new cement. For this purpose, CEN/TC 51 has prepared this CEN Technical Report. PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 5 1 Scope This CEN Technical Report provides guidance for the procedure to be followed in order to support the European standardization of new cements that are not cove

35、red by an existing European Standard. The term “new cement” has been used in this document to describe its primary focus; however, this same guideline procedure may be used for other products to be standardized by CEN/TC 51. 2 Normative references The following documents, in whole or in part, are no

36、rmatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 197-1, Cement Part 1: Composition, specifications and co

37、nformity criteria for common cements EN 197-2, Cement Part 2: Conformity evaluation EN 206, Concrete Specification, performance, production and conformity 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 197-1, EN 197-2 and EN 206 apply. 4 Procedure of

38、 application and standardization of a new cement 4.1 General information on standardization processes For general information on the process of European product standardization, see http:/boss.cen.eu/Pages/default.aspx. 4.2 Classification of new cements The procedure to be followed in order to suppo

39、rt the European standardization of a new cement depends on the type of the cement, i.e. on the question whether the new cement is similar to cements that already have been standardized by CEN/TC 51. Following this principle, new cements can be classified in the following three categories: 1) Categor

40、y 1: cement from a new combination of traditional and well-tried constituents; 2) Category 2: cement basically corresponding to cement types defined in existing standards but containing one or more new constituents; 3) Category 3: cement differing substantially from those types defined in existing s

41、tandards, e.g. produced with a new kind of clinker or based on different physicochemical phases/principles. Cement of category 2 should be similar to common cements, i.e. its hydration should be based on the formation of calcium silicate hydrates (CSH). PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 6 4.

42、3 General criteria for the assessment of new cements The general requirements for assessing new cements differ depending on their classification according to 4.2; these requirements should be fulfilled before CEN/TC 51 considers the possibility of European standardization of a new cement: for cement

43、s of category 1, the mechanical, physical and chemical performances listed in 5.3 as well as durability related characteristics described in 5.4.3 should be assessed, taking into account the intended use of the cement. for cements of category 2, in addition to the requirements for cement of category

44、 1, the potential environmental and health impacts of end-use construction products that incorporate the cement should be assessed as described in 5.4.4 and 5.4.5, respectively. for cements of category 3, in addition to the requirements for cement of category 2, also relevant practical experience sh

45、ould be gained under conditions approved by CEN/TC 51, e.g. through an ETA or another comparable procedure, for assessing the fitness for the intended use prior to identifying the general criteria, amongst other things, for the possibility of European standardization. The categorization of new cemen

46、ts and the corresponding requirements are summarized in Table 1. Table 1 Categorization of new cements and the corresponding requirements Category 1 Cement from a new combination of constituents according to EN 1971 Category 2 Cement containing a minor amount of one or more new constituents Category

47、 3 Cement differing substantially from those types defined in existing standards Assessment of mechanical, physical and chemical performances Assessment of durability related characteristics Assessment of influence on environmental performance Assessment of possible health impact Relevant practical

48、experience gained under approved conditions prior to European standardization 4.4 Application for the standardization of a new cement 4.4.1 General An application for the standardization of a new cement should be presented to CEN/TC 51 for approval using, as the basis of, the CEN form for a New Work

49、 Item (NWI) proposal (see http:/boss.cen.eu/Pages/default.aspx) and a dossier (4.4.2). The dossier may be submitted with the application where considered by the applicant to be complete, alternatively initial proposals for testing procedures etc. may accompany the application (see 4.4.2). PD CEN/TR 16912:2016CEN/TR 16912:2016 (E) 7 4.4.2 The dossier and its contents The dossier should provide the necessary information, especially to demonstrate the fitness for intended use of the new cement, i.e. in particular the following: definition and, where appli