BRITISH STANDARD
Concrete Part 9: Additional Rules for Selfcompacting Concrete (SCC)
ICS 91.100.30
NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
BS EN 206-9:2010
BS EN 206-9:2010
National foreword This British Standard is the UK implementation of EN 206-9:2010. The UK participation in its preparation was entrusted to Technical Committee B/517/1, Concrete production and testing. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.
This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2010 © BSI 2010
ISBN 978 0 580 60454 6
Amendments/corrigenda issued since publication Date
Comments
BS EN 206-9:2010
EUROPEAN STANDARD
EN 206-9
NORME EUROPÉENNE EUROPÄISCHE NORM
April 2010
ICS 91.100.30
English Version
Concrete - Part 9: Additional Rules for Self-compacting Concrete (SCC) Béton - Partie 9 : Règles complémentaires pour le béton auto-plaçant
Beton - Teil 9: Ergänzende Regeln für selbstverdichtenden Beton (SVB)
This European Standard was approved by CEN on 27 February 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions 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 Management Centre or to any CEN member. This European Standard exists 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN
All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. EN 206-9:2010: E
BS EN 206-9:2010 EN 206-9:2010 (E)
Contents
Page
Foreword ..............................................................................................................................................................4 Introduction .........................................................................................................................................................5 1
Scope ......................................................................................................................................................6
2
Normative references ............................................................................................................................6
3 3.1 3.2
Terms, definitions, symbols and abbreviations ...................................................................................7 Terms and definitions ...........................................................................................................................7 Symbols and abbreviations ..................................................................................................................7
4 4.1 4.2 4.3
Classification..........................................................................................................................................8 Exposure classes related to environmental actions ..........................................................................8 Fresh concrete .......................................................................................................................................8 Hardened concrete .................................................................................................................................9
5 5.1 5.2 5.3 5.4 5.5
Requirements for concrete and methods of verification ................................................................ 10 Basic requirements for constituent materials.................................................................................... 10 Basic requirements for composition of concrete ............................................................................. 10 Requirements related to exposure classes ..................................................................................... 11 Requirements for fresh concrete ....................................................................................................... 11 Requirements for hardened concrete ............................................................................................... 12
6 6.1 6.2 6.3 6.4
Specification of concrete ................................................................................................................... 12 General ................................................................................................................................................. 12 Specification for designed concrete .................................................................................................. 12 Specification for prescribed concrete ............................................................................................... 13 Specification of standardized prescribed concrete .......................................................................... 13
7 7.1 7.2 7.3 7.4 7.5
Delivery of fresh concrete .................................................................................................................. 13 Information from the user of the concrete to the producer ........................................................... 13 Information from the producer of the concrete to the user ........................................................... 13 Delivery ticket for ready-mixed concrete ......................................................................................... 13 Delivery information for site-mixed concrete .................................................................................. 13 Consistence at delivery ...................................................................................................................... 13
8 8.1 8.2 8.3 8.4
Conformity control and conformity criteria ..................................................................................... 14 General ................................................................................................................................................. 14 Confomity control for designed concrete ........................................................................................ 14 Conformity control of prescribed concrete including standardized prescribed concrete ......... 14 Actions in the case of non-conformity of the product .................................................................... 14
9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9
Production control .............................................................................................................................. 14 General ................................................................................................................................................. 14 Production control systems .............................................................................................................. 15 Recorded data and other documents ............................................................................................... 15 Testing ................................................................................................................................................. 15 Concrete composition and initial testing ......................................................................................... 15 Personnel, equipment and installation ............................................................................................. 15 Batching of constituent materials ..................................................................................................... 15 Mixing of concrete .............................................................................................................................. 15 Production control procedures ......................................................................................................... 15
10
Evaluation of conformity .................................................................................................................... 16
11
Designation for designed concrete................................................................................................... 16
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Annex A (normative) Initial Test ...................................................................................................................... 17 A.1
General ................................................................................................................................................ 17
A.2
Party responsible for initial tests ...................................................................................................... 17
A.3
Frequency of initial tests ................................................................................................................... 17
A.4
Test conditions ................................................................................................................................... 17
A.5
Criteria for adoption of initial tests ................................................................................................... 17
Annex B (normative) Identity testing for compressive strength .................................................................. 18 Annex C (normative) Provisions for assessment , surveillance and certification of production control................................................................................................................................................... 19 Annex D (informative) Bibliography ................................................................................................................ 20 Annex E (informative) Guidance on the application of the equivalent performance concept of concrete properties ............................................................................................................................. 21 Annex F (informative) Recommendations for limiting values of concrete compositions ......................... 22 Annex H (informative) Additional provisions for high strength concrete ................................................... 23 Annex J (informative) Performance-related design methods with respect to durability ........................... 24 Annex K (informative) Concrete families ........................................................................................................ 25 Annex L (informative) Guidelines for SCC requirements in the fresh state ............................................... 26 L.1 General ................................................................................................................................................. 26 L.2 Recommendations on classification of SCC ..................................................................................... 27 L.2.1 Slump flow ........................................................................................................................................... 27 L.2.2 Viscosity ............................................................................................................................................... 27 L.2.3 Passing ability ..................................................................................................................................... 27 L.2.4 Stability ................................................................................................................................................. 27
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Foreword This document (EN 206-9:2010) 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 be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2010, and conflicting national standards shall be withdrawn at the latest by October 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. This European Standard is additional to EN 206-1:2000 and it gives the rules for self-compacting concrete (SCC). Common rules are not repeated in this European Standard and as a consequence, it has to be used with EN 206-1:2000. When EN 206-1:2000 is revised, this European Standard will be merged into the main document. The numbering of this European Standard follows EN 206-1:2000.
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Introduction Self-compacting concrete (SCC) is an evolving technology and practices vary. This European Standard sets common requirements, but where this is not possible the relevant clause contains permission for the application of national standards or provisions valid in the place of use of the concrete. This European Standard will be applied in Europe under different climatic and geographical conditions, different levels of protection and under different, well established, regional traditions and experience. Classes for selfcompacting concrete properties have been introduced to cover this situation. Where such general solutions were not possible, the relevant clauses contain permission for the application of national standards or provisions valid in the place of use of the concrete. In tables, notes and footnotes in this European Standard are normative unless stated otherwise; other notes and footnotes are informative. Further explanations and guidance on the application of this European Standard are given in other documents valid in the place of use. Further guidance on the production and other aspects of SCC is given in The European Guidelines for SelfCompacting Concrete – Specification, Production and Use , see also Annex D.
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1
Scope
This European Standard applies to SCC for structures cast in situ, precast structures, and structural precast products for buildings and civil engineering structures. This European Standard applies to SCC which is self-compacting by gravity to retain no appreciable amount of entrapped air other than entrained air. This Standard applies to normal-weight concrete. Experience with SCC containing light-weight or heavy-weight aggregate and fibres is limited. Some but not all provisions of this Standard apply for these forms of SCC but the requirements have to be determined on a case by case basis. The SCC may be mixed on site, ready-mixed concrete or produced in a plant for precast concrete products. In addition to those in EN 206-1:2000, this European Standard specifies requirements for:
the constituent materials of SCC;
the properties of fresh and hardened SCC and their verification;
the limitations for SCC composition;
the specification of SCC;
the factory production control procedures;
the conformity criteria.
Other European Standards for specific products e.g. precast products or for processes within the field of the scope of this European Standard may require or permit deviations from this European Standard. The limitations described in the scope of EN 206-1:2000 apply to SCC conforming to this European Standard. This European Standard does not cover health and safety requirements for the protection of workers during production and delivery of concrete.
2
Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 206-1:2000, Concrete - Part 1: Specification, performance, production and conformity FprEN 12350-8, Testing fresh concrete - Part 8: Self-compacting concrete – Slump-flow test FprEN 12350-9, Testing fresh concrete - Part 9: Self-compacting concrete – V-funnel test FprEN 12350-10, Testing fresh concrete - Part 10: Self-compacting concrete – L box test FprEN 12350-11, Testing fresh concrete - Part 11: Self-compacting concrete – Sieve segregation test FprEN 12350-12, Testing fresh concrete - Part 12: Self-compacting concrete – J-ring test
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3
Terms, definitions, symbols and abbreviations
3.1 Terms and definitions For the purposes of this document, the terms and definitions given in EN 206-1:2000 and the following apply. 3.1.47 self-compacting concrete (SCC) concrete that is able to flow and compact under its own weight, fill the formwork with its reinforcement, ducts, boxouts etc., whilst maintaining homogeneity 3.1.48 flowability the ease of flow of fresh SCC when unconfined by formwork and/or reinforcement 3.1.49 segregation resistance the ability of fresh SCC to remain homogeneous in composition while in its fresh state 3.1.50 slump-flow the mean diameter of the spread of fresh SCC from a conventional slump cone 3.1.51 viscosity the resistance to flow of fresh SCC once flow has started 3.1.52 passing ability the ability of fresh SCC to flow through tight openings such as spaces between steel reinforcing bars without segregation or blocking
3.2 Symbols and abbreviations For the purposes of this document, the symbols and abbreviations given in EN 206-1:2000 and the following apply. SCC
Self-compacting concrete
SF
Slump-flow class
VS
Viscosity class for the t500 test
VF
Viscosity class for the V-funnel test
t500
Time in seconds to flow to a diameter of 500 mm in a slump-flow test
PL
Passing ability class for the L-box-test
PJ
Passing ability class for the J-ring-test
SR
Segregation resistance class
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4
Classification
4.1 Exposure classes related to environmental actions EN 206-1:2000, 4.1 applies
4.2 Fresh concrete 4.2.1
Consistence classes
The following consistence classes apply to SCC: Table 1 — Slump-flow classes Class
Slump-flow in mm
a, b
(Limit values for individual batches) SF1
550 to 650
SF2
660 to 750
SF3
760 to 850
a
The specification of a slump-flow class may be replaced by a target value.
b
The classification is not applicable to concrete with a maximum aggregate size exceeding 40 mm.
Table 2 — Viscosity classes – t500 Class
t500 (s)
a, b
(Limit values for individual batches) VS1
< 2,0
VS2
≥ 2,0
a
The specification of a viscosity class may be replaced by a target value.
b
The classification is not applicable to concrete with a maximum aggregate size exceeding 40 mm.
Table 3 — Viscosity classes – V-funnel Class
V-funnel flow time (s)
a, b
(Limit values for individual batches)
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VF1
< 9,0
VF2
9,0 to 25,0
a
The specification of a viscosity class may be replaced by a target value.
b
The classification is not applicable to concrete with a maximum aggregate size exceeding 22,4 mm.
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Table 4 — Passing ability classes - L-box L-box ratio (-)
Class
a
(Limit values for individual batches) PL1
≥ 0,80 with 2 rebars
PL2
≥ 0,80 with 3 rebars
a
The specification of a passing ability class may be replaced by an alternative minimum value.
Table 5 — Passing ability classes – J-ring J-ring step (mm)
Class
a, b
(Limit values for individual batches) PJ1
≤ 10 with 12 rebars
PJ2
≤ 10 with 16 rebars
a
The specification of a passing ability class may be replaced by an alternative maximum value.
b
The classification is not applicable to concrete with a maximum aggregate size exceeding 40 mm.
Table 6 — Sieve segregation resistance classes Segregated portion (%)
Class
a,b
(Limit values for individual batches) SR1
≤ 20
SR2
≤ 15
a
The specification of a segregation resistance class may be replaced by an alternative maximum value.
b
The classification is not applicable to concrete containing fibres or lightweight aggregate.
NOTE 1
The classes in tables 2 and 3 are similar but not exactly correlated.
NOTE 2
The classes in tables 4 and 5 are similar but not exactly correlated.
4.2.2
Classes related to maximum aggregate size
EN 206-1:2000, 4.2.2 applies
4.3 Hardened concrete 4.3.1
Compressive strength classes
EN 206-1:2000, 4.3.1 applies 4.3.2
Density classes for light-weight concrete
EN 206-1:2000, 4.3.2 applies
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Requirements for concrete and methods of verification
5.1 Basic requirements for constituent materials 5.1.1
General
EN 206-1:2000, 5.1.1 applies 5.1.2
Cement
EN 206-1:2000, 5.1.2 applies 5.1.3
Aggregates
EN 206-1:2000, 5.1.3 applies 5.1.4
Mixing water
EN 206-1:2000, 5.1.4 applies 5.1.5
Admixtures
EN 206-1:2000, 5.1.5 applies, together with the following provision: Special admixtures, e.g. viscosity agents, with established suitability may be used in SCC. 5.1.6
Additions (including mineral fillers and pigments)
EN 206-1:2000, 5.1.6 applies
5.2 Basic requirements for composition of concrete 5.2.1
General
EN 206-1:2000, 5.2.1 applies 5.2.2
Selection of cement
EN 206-1:2000, 5.2.2 applies 5.2.3
Use of aggregates
EN 206-1:2000, 5.2.3 applies 5.2.4
Use of recycled water
EN 206-1:2000, 5.2.4 applies where together with the following note: NOTE Practice has shown that varying contents (e.g. solids) of recycled water can have an effect on the properties of SCC, see A.4.
5.2.5
Use of additions
EN 206-1:2000, 5.2.5 applies
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5.2.6
Use of admixtures
EN 206-1:2000, 5.2.6 applies 5.2.7
Chloride content
EN 206-1:2000, 5.2.7 applies 5.2.8
Concrete temperature
EN 206-1:2000, 5.2.8 applies
5.3 Requirements related to exposure classes EN 206-1:2000, 5.3 applies
5.4 Requirements for fresh concrete 5.4.1
Consistence of self-compacting concrete
EN 206-1:2000, 5.4.1 does not apply: Where the flowability of self-compacting concrete is to be determined, it shall be measured as a slump-flow test in accordance with EN 12350-8 1) Where the viscosity of self-compacting concrete is to be determined, it shall be measured either by means of:
t500 test conforming to EN 12350-8 1)
V-funnel test conforming to EN 12350-9 1)
Where the passing ability of self-compacting concrete is to be determined, it shall be measured either by means of :
L-box test conforming to EN 12350-10 1)
J-ring test conforming to EN 12350-12 1)
Where the resistance to segregation of self-compacting concrete is to be determined, it shall be measured by means of :
Sieve segregation resistance test conforming to EN 12350-11 1)
Where the consistence of self-compacting concrete is to be determined, it shall be tested at the time of use of the concrete or in the case of ready-mixed concrete, at the time of delivery. If concrete is delivered in a truck mixer or agitating equipment, the consistence may be measured using a spot sample obtained from the initial discharge. The consistence shall be specified either by reference to a consistence class according to 4.2.1, or by a target value or limit value. For target values, the related tolerances are given in Table 7.
1) The flowability, viscosity, passing ability and resistance to segregation may also be determined by alternative test methods valid in the place of use if there is an established relationship (see EN 206-1:2000, 9.4).
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Table 7 — Tolerances for target values of consistence Performance Criteria
Tolerances on single test results
a
Slump-Flow Tolerance in mm
± 50
t500 Tolerance in s
±1
V-funnel Target value in s
<9
≥9
Tolerance in s
±3
±5
a
5.4.2
The values given in this table apply except where alternative values are given in the National Annex.
Cement content and water / cement ratio
EN 206-1:2000, 5.4.2 applies 5.4.3
Air content
EN 206-1:2000, 5.4.3 applies 5.4.4
Maximum aggregate size
EN 206-1:2000, 5.4.4 applies
5.5 Requirements for hardened concrete EN 206-1:2000, 5.4.5 applies
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Specification of concrete
6.1 General EN 206-1:2000, 6.1 applies, together with the following NOTE: Note
Annex L gives further guidance about various test classes for consistency.
6.2 Specification for designed concrete 6.2.1
General
EN 206-1:2000, 6.2.1 applies 6.2.2
Basic requirements
EN 206-1:2000, 6.2.2 applies, where h) is replaced by the following: h) Slump-flow class according to table 6a or, in special cases, a target value for slump-flow.
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6.2.3
Additional requirements
EN 206-1:2000, 6.2.3 applies: Where necessary to achieve the intended performance of the concrete, select and specify from the following list of options:
viscosity class according to table 2 or 3 or, in special cases, a target value for t500 or V-funnel time;
passing ability according to table 4 or 5 or, in special cases, a minimum value for L-box ratio or a maximum value for J-ring step;
segregation resistance according to table 6 or, in special cases, a maximum value for segregation portion;
other technical requirements, which may include consistence retention time.
6.3 Specification for prescribed concrete EN 206-1:2000, 6.3 applies
6.4 Specification of standardized prescribed concrete EN 206-1:2000, 6.4 applies
7 7.1
Delivery of fresh concrete Information from the user of the concrete to the producer
EN 206-1:2000, 7.1 applies
7.2
Information from the producer of the concrete to the user
EN 206-1:2000, 7.2 applies, where the list in the 1st paragraph is augmented by the following point: g) properties of SCC in terms of ´Slump Flow SF´ and ´Segregation resistance SR´
7.3 Delivery ticket for ready-mixed concrete EN 206-1:2000, 7.3 applies
7.4 Delivery information for site-mixed concrete EN 206-1:2000, 7.4 applies
7.5 Consistence at delivery EN 206-1:2000, 7.5 applies
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8
Conformity control and conformity criteria
8.1 General EN 206-1:2000, 8.1 applies
8.2 Confomity control for designed concrete EN 206-1:2000, 8.2 applies 8.2.1
Conformity control for compressive strength
EN 206-1:2000, 8.2.1 applies 8.2.2
Conformity control for tensile splitting strength
EN 206-1:2000, 8.2.2 applies 8.2.3 8.2.3.1
Conformity control for properties other than strength Sampling and testing plan
EN 206-1:2000, 8.2.3.1 applies 8.2.3.2
Conformity criteria for properties other than strength
EN 206-1:2000, 8.2.3.2 applies, together with the following requirements: The minimum frequency of testing slump-flow shall be that given in EN 206-1:2000 for consistence or in other relevant standards. Testing for the t500 value, V-funnel time, L-box ratio, J-ring and sieve segregation resistance shall be undertaken where a class or target value has been specified. Unless specified otherwise, verification of this requirement shall form part of the initial testing. When consistence is specified in terms of classes, the SCC shall conform to the criteria given in Tables 1 to 6. When consistence is specified in terms of target values, the SCC shall conform to the criteria given in Table 7.
8.3 Conformity control of prescribed concrete including standardized prescribed concrete EN 206-1:2000, 8.3 applies
8.4 Actions in the case of non-conformity of the product EN 206-1:2000, 8.4 applies
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Production control
9.1 General EN 206-1:2000, 9.1 applies
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9.2 Production control systems EN 206-1:2000, 9.2 applies
9.3 Recorded data and other documents EN 206-1:2000, 9.3 applies
9.4 Testing EN 206-1:2000, 9.4 applies 9.5 Concrete composition and initial testing
EN 206-1:2000, 9.5 applies, where the 1st paragraph of the clause is replaced by: For the production of self-compacting concrete, initial testing shall be performed to provide a concrete that achieves the declared properties or specified performance with an adequate margin (see Annex A).
9.6 Personnel, equipment and installation 9.6.1
Personnel
EN 206-1:2000, 9.6.1 applies, where the 1st paragraph of the clause is replaced by: Knowledge, training and experience of personnel involved in production and production control shall be appropriate to the type of concrete, e.g. self-compacting concrete, high strength concrete, lightweight concrete. 9.6.2
Equipment and installation
EN 206-1:2000, 9.6.2 applies
9.7 Batching of constituent materials EN 206-1:2000, 9.7 applies
9.8 Mixing of concrete EN 206-1:2000, 9.8 applies 9.9 Production control procedures
The text of EN 206-1:2000,9.9 applies together with the following NOTE.: NOTE To produce consistent self-compacting concrete, it is essential to have constituent materials with consistent properties. These properties should be monitored more frequently than for ordinary concrete.
EN 206-1:2000, 9.9, Table 24 applies except lines 6 and 7 for consistence. For consistence of SCC the following Table 8 applies.
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Table 8 — Control of production procedures and of consistence for SCC Type of test
Purpose
Minimum frequency
Visual inspection
For comparison with normal appearance
Each batch or load
Consistence test according to
To assess the achievement of the specified values of consistence and to check e.g. possible changes of water content
At least once a day
Inspection/ test
1 2
Consistence
EN 12350-8 (slump-flow),
When testing compressive strength (same frequency)
When testing air content
In case of doubt following visual inspections 3
Consistence test according to EN 12350-9 (V-funnel) , 10 (L-box), 11 (Sieve segregation resistance), 12 J-ring
To assess the achievement of the declared values of consistence
10 Evaluation of conformity EN 206-1:2000, Clause 10 applies
11 Designation for designed concrete EN 206-1:2000, Clause 11 applies
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When performing initial test. Before using a new concrete composition. In case of a change in the constituents In case of doubt following visual inspections or slump-flow test.
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Annex A (normative) Initial Test
A.1 General EN 206-1:2000, A.1 applies
A.2 Party responsible for initial tests EN 206-1:2000, A.2 applies
A.3 Frequency of initial tests EN 206-1:2000, A.3 applies
A.4 Test conditions EN 206-1:2000, A.4 applies, together with the following provision: In case of self-compacting concrete, initial tests shall include a study of mix design robustness regarding water content variations: an allowable range of water content within which fresh-state specifications (flowing ability, viscosity, passing ability and segregation resistance) are fulfilled shall be defined. Where recycled water is to be used, initial tests shall demonstrate that fresh concrete properties are adequate, taking into account the variations of solid content and chemical analysis of recycled water at the given concrete batching plant.
A.5 Criteria for adoption of initial tests EN 206-1:2000, A.5 applies, together with the following provision: For Self-Compacting Concrete, initial tests shall demonstrate that in the required slump-flow range the mix retains the declared properties in terms of viscosity, passing ability and segregation resistance.
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Annex B (normative) Identity testing for compressive strength
EN 206-1:2000, Annex B applies
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Annex C (normative) Provisions for assessment , surveillance and certification of production control
EN 206-1:2000, Annex C applies
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Annex D (informative) Bibliography
EN 206-1:2000, Annex D applies together with the following publication: BIBM/CEMBUREAU/ERMCO/EFCA/EFNARC: The European Guidelines for Self-Compacting Concrete – Specification, Production and Use. May 2005
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Annex E (informative) Guidance on the application of the equivalent performance concept of concrete properties
EN 206-1:2000, Annex E applies
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Annex F (informative) Recommendations for limiting values of concrete compositions
EN 206-1:2000, Annex F applies
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Annex H (informative) Additional provisions for high strength concrete
EN 206-1:2000, Annex H applies
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Annex J (informative) Performance-related design methods with respect to durability
EN 206-1:2000, Annex J applies
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Annex K (informative) Concrete families
EN 206-1:2000, Annex K applies
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Annex L (informative) Guidelines for SCC requirements in the fresh state
L.1 General Specific requirements for SCC in the fresh state depend on the type of application, and especially on:
confinement conditions related to the concrete element geometry, and the type, location and number of inserts (reinforcement density, spacing, cover and any recesses etc.);
placing equipment (pump, truck-mixer, skip);
placing methods (number of delivery points);
finishing method.
The classification system according to clause 4 provides for an appropriate specification of SCC to cover these requirements, which are characterised by four key test parameters:
flowability and filling ability
Slump-flow SF;
viscosity,
Viscosity VS or VF;
passing ability,
Passing ability PL or PJ;
segregation resistance
Stability SR.
Self-compacting concrete characteristics that are appropriate for a given application should be selected from these four parameters and then specified by class or target value according to 5.4.1. In the case of precast concrete and site-mixed concrete, it is usual to directly demonstrate the quality of final concrete in the product. For ready-mixed concrete, parameters and classes should be carefully selected, controlled and justified on the basis of contractor and concrete producer experience or by specific trials. It is therefore important that the concrete specifier and concrete producer discuss and define clearly those parameters before starting concreting. Slump-flow will normally be specified. If there is little or no reinforcement, there may be no need to specify passing ability as a requirement, see L.2.3. Viscosity may be important where good surface finish is required or reinforcement is very dense, see L.2.2. Stability becomes increasingly important with higher fluidity and lower viscosity SCC. The required consistence retention time will depend on the transportation and placing time as well as on the concrete temperature. This should be determined and specified, and the SCC should maintain its fresh properties during this period. Self-compacting concrete should, if possible be placed in one continuous pour, so delivery rates should be matched to placing rate and also be agreed with the producer in order to avoid interruptions to placing due to delays in delivery or in placing after the concrete reaches site.
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BS EN 206-9:2010 EN 206-9:2010 (E)
L.2 Recommendations on classification of SCC L.2.1 Slump flow The slump-flow value relates to the flowability and filling ability in unconfined conditions and it will normally be specified. The test is not suitable when the maximum size of the aggregate exceeds 40 mm.
L.2.2 Viscosity The flow of SCC with low viscosity will initially be very rapid, and then stop. SCC with high viscosity may continue to creep forward over an extended time. Viscosity can be assessed either by measuring the t500 (during the slump-flow test) or by measuring the V-Funnel time. The V-Funnel test is not suitable when the maximum size of the aggregate exceeds 22,4 mm. It may be helpful to measure the t500 time while doing the slump-flow test as a way of confirming uniformity of the SCC from batch to batch.
L.2.3 Passing ability Passing ability relates to the capacity of the fresh mix to flow without loss of uniformity or causing blocking through confined spaces and narrow openings such as areas of congested reinforcement. In defining the passing ability, it is necessary to consider the geometry of the reinforcement. The defining dimension is the smallest gap through which SCC has to continuously flow through to fill the formwork (“flowing gap”). For complex structures with a flowing gap less than 60 mm, specific mock-up trials may be necessary.
L.2.4 Stability The stability value describes the segregation resistance and is fundamental for the in-situ homogeneity and quality of SCC. SCC can suffer from both dynamic segregation during placing and static segregation after placing, but before stiffening. Static segregation will be most detrimental in tall elements but even in thin slabs, it can lead to surface defects such as cracking or a weak surface. The segregation resistance test is not applicable to concrete containing fibres or lightweight aggregate. Stability becomes an important parameter with higher slump-flow classes and/or the lower viscosity classes. Further guidance on the production and other aspects of SCC is given in The European Guidelines for SelfCompacting Concrete – Specification, Production and Use.
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BS EN 206-9:2010
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