1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 480-15:2013Admixtures for concrete,mortar and grout TestmethodsPart 15: Reference concrete and method fortesting viscosity modifying admixturesBS EN 480-15:2013 BRITISH STA
2、NDARDNational forewordThis British Standard is the UK implementation of EN 480-15:2013.The UK participation in its preparation was entrusted to TechnicalCommittee B/517/3, Admixtures.A list of organizations represented on this committee can beobtained on request to its secretary.This publication doe
3、s not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 76349 6ICS 91.100.30Compliance with a British Standard cannot confer immunity fromlegal o
4、bligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2013.Amendments issued since publicationDate Text affectedBS EN 480-15:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 480-15 March 2013 ICS 91.100.30 English Version
5、 Admixtures for concrete, mortar and grout - Test methods - Part 15: Reference concrete and method for testing viscosity modifying admixtures Adjuvant pour bton, mortier et coulis - Mthodes dessai - Partie 15: Bton de rfrence et mthode dessai des adjuvants modificateurs de viscosit Zusatzmittel fr B
6、eton, Mrtel und Einpressmrtel - Prfverfahren - Teil 15: Referenzbeton und Prfverfahren zur Prfung von viskosittsmodifizierenden Zusatzmitteln This European Standard was approved by CEN on 19 January 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the c
7、onditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard ex
8、ists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national s
9、tandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
10、 Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldw
11、ide for CEN national Members. Ref. No. EN 480-15:2013: EBS EN 480-15:2013EN 480-15:2013 (E) 2 Contents Page Foreword . 3 1 Scope 4 2 Normative references . 4 3 Constituent materials . 4 3.1 Cement . 4 3.2 Aggregate . 4 3.3 Mixing water . 5 4 Reference concrete 5 5 Preparation of reference concrete .
12、 6 5.1 Mix proportions 6 5.2 Mixing and testing 6 6 Test report 7 BS EN 480-15:2013EN 480-15:2013 (E) 3 Foreword This document (EN 480-15:2013) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This European Standard shall b
13、e given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2013, and conflicting national standards shall be withdrawn at the latest by September 2013. Attention is drawn to the possibility that some of the elements of this doc
14、ument may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document has been drafted by Subcommittee 3 (SC 3) of CEN/TC 104 “Admixtures for concrete, mortar and grout”. This draft European Standard is part of the se
15、ries EN 480, Admixtures for concrete, mortar and grout Test methods which is comprised of the following parts: Part 1: Reference concrete and reference mortar for testing Part 2: Determination of setting time Part 4: Determination of bleeding of concrete Part 5: Determination of capillary absorption
16、 Part 6: Infrared analysis Part 8: Determination of the conventional dry material content Part 10: Determination of water soluble chloride content Part 11: Determination of air void characteristics in hardened concrete Part 12: Determination of the alkali content of admixtures Part 13: Reference mas
17、onry mortar for testing mortar admixtures Part 14: Determination of the effect on corrosion susceptibility of reinforcing steel by potentiostatic electro-chemical test Part 15: Reference concrete and method for testing viscosity modifying admixtures (the present document) This European Standard is a
18、pplicable together with the other standards of the EN 480 series and for testing admixtures in accordance with the EN 934 series of standards. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Stand
19、ard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spa
20、in, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 480-15:2013EN 480-15:2013 (E) 4 1 Scope This European Standard specifies the constituent materials, the composition and the mix procedure to produce a reference concrete with a prescribed consistency and segregated portion for testing vis
21、cosity modifying admixtures as defined in EN 934-2. It also describes how to determine the requirements for the test mix in comparison with the control mix. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its
22、application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 196-2, Methods of testing cement Part 2: Chemical analysis of cement EN 196-6, Methods of testing cement Part 6: Determinati
23、on of fineness EN 197-1, Cement Part 1: Composition, specifications and conformity criteria for common cements EN 934-2, Admixtures for concrete, mortar and grout Part 2: Concrete admixtures Definitions, requirements, conformity, marking and labelling EN 1008, Mixing water for concrete Specification
24、 for sampling, testing and assessing the suitability of water, including water recovered from processes in the concrete industry, as mixing water for concrete EN 12350-7, Testing fresh concrete Part 7: Air content Pressure methods EN 12350-8, Testing fresh concrete Part 8: Self-compacting concrete S
25、lump-flow test EN 12350-11, Testing fresh concrete Part 11: Self-compacting concrete Sieve segregation test EN 12390-1, Testing hardened concrete Part 1: Shape, dimensions and other requirements for specimens and moulds EN 12390-2, Testing hardened concrete Part 2: Making and curing specimens for st
26、rength tests EN 12620, Aggregates for concrete 3 Constituent materials 3.1 Cement The reference concrete shall be made with a CEM l cement of strength class 42,5 or 52,5 conforming to EN 197-1. The cement used shall have a C3A content of 7 % to 11 % by mass calculated from chemical analysis accordin
27、g to EN 196-2 and a specific surface of 3 200 cm2/g to 4 600 cm2/g determined according to EN 196-6. 3.2 Aggregate A natural normal weight aggregate conforming to EN 12620 with low water absorption ( 2 % by mass) shall be used. The grading shall conform to Table 1. BS EN 480-15:2013EN 480-15:2013 (E
28、) 5 Table 1 Aggregate for reference concrete Aperture size - mm Percentage by mass passing the test sieve 16 95 to 100 12 85 to 100 8 62 to 74 4 42 to 52 2 28 to 38 1 19 to 29 0,500 11 to 21 0,250 4 to 14 0,125 2 to 6 0,063 0 to 2 3.3 Mixing water Water according to EN 1008, or distilled or de-ionis
29、ed water shall be used as mixing water. Wash water from concrete production shall not be used. 4 Reference concrete Unless otherwise specified, tests on the reference concrete are performed as comparative tests. That is, the performance of the admixtures is determined by comparing the reference conc
30、rete containing the viscosity modifying admixture (test mix) with the reference concrete made without the viscosity modifying admixture (control mix) but otherwise with the same aggregate/cement ratio and constituents from the same delivery. The requirements for the reference concrete are given in T
31、able 2. The fresh concrete shall be fully compacted. The air content of the control mix shall not exceed 2 % by volume. BS EN 480-15:2013EN 480-15:2013 (E) 6 Table 2 Requirements for reference concrete Constituent / test Requirement Reference Cement (400 10) kg/m3Aggregate According to 3.2. The aggr
32、egate: cement ratio shall be recorded Superplasticizer to EN 934-2 Within manufacturers normal range Water 230 kg/m3Slump flow (SF) to EN 12350-8 Control mix 660 mm to 750 mm Test mix control mix Sieve segregation (SR) to EN 12350-11 Control mix 15 % SR 30 % Air content to EN 12350-7 Control mix 2 %
33、 5 Preparation of reference concrete 5.1 Mix proportions The mix proportions shall be in accordance with Table 2. The aggregate shall be used in an oven dry condition ( 105 C) to remove doubts on moisture content variation. If the aggregate is not oven dry, its moisture content shall be determined a
34、nd the aggregate and water content shall be corrected accordingly. In the case of dispute, oven dry aggregates shall be used. The dosage of the superplasticizer and the quantity of water in the control mix shall be such as to obtain an initial slump flow (SF) and sieve segregation (SR) in accordance
35、 with Table 2. The test mix containing the viscosity modifying admixture shall have the same water content, cement content and the same aggregate: cement ratio as the control mix but the dosage of superplasticizer shall be adjusted if necessary to give a consistence not less than that of the control
36、 mix. 5.2 Mixing and testing Prior to mixing, each of the constituents shall be conditioned to a temperature of (20 2) C. The following mixing technique shall be adopted to ensure repeatability of results and eliminate initial moisture absorption effects on consistence. Use a forced action pan mixer
37、 to a minimum of 50 % and a maximum 90 % of capacity. Wipe the inside with a damp cloth if dry. Add all the aggregates to the pan mixer with half the mixing water. Mix for 2 min then stand for 2 min. Cover the pan mixer during the standing period to minimise evaporation effects. Restart the mixer fo
38、r 30 s after or while adding the cement. Over the next 30 s, add the remaining water and admixtures as appropriate to the mix (noting any manufacturers recommendations with respect to the order and timing). Mix for a further 2 min. Determine the slump flow (SF) and start the sieve segregation test (
39、SR) within 10 min of completion of mixing. BS EN 480-15:2013EN 480-15:2013 (E) 7 If the slump flow and sieve segregation of the control mix are outside the limits in Table 2, discard the mix and repeat at a revised water or superplasticiser content. If the slump flow of the test mix is not equal to
40、or greater than the slump flow of the control mix, discard the mix and repeat at a revised superplasticiser content. Determine the fresh density and air content within 30 min from completion of mixing (if necessary the concrete may be remixed for 10 s). If the air content and/or cement content of th
41、e control mix calculated from the fresh density are outside the limits in Table 2, discard the mix and test a new mix. Take three specimens from each mix for compressive strength testing. The control mix should be held for 60 min to 90 min then remixed for 1 min before taking the specimens to preven
42、t segregation in the cube or cylinder mould. The test mix specimens should not be remixed but be made within 60 min from completion of initial mixing. Prepare and cure the specimens in accordance with EN 12390-2 using moulds conforming to EN 12390-1. If the compressive strength of one of the specime
43、ns varies from the average of the set by more than 10 % it shall be discarded and the average recalculated from the remaining two specimens. 6 Test report The test report shall include the following information for the control and test mixes: a) A reference to this standard. b) Aggregate: 1) source
44、and type; 2) crushed / uncrushed; 3) grading; 4) moisture content if not oven dry. c) Cement: 1) source; 2) notation to EN 197-1 including strength class; 3) C3A content; 4) specific surface. d) Concrete: 1) aggregate: cement ratio of control and test mixes; 2) admixture dose in the control and test
45、 mixes (superplasticizer and the viscosity modifying admixture); 3) consistence, slump flow (SF); 4) sieve segregation, segregated portion (SR); 5) air content; 6) fresh bulk density; 7) compressive strength individual and average results. This page deliberately left blankThis page deliberately left
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