EN 12350-7:2009

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskušanje svežega betona - 7. del: Vsebnost zraka - Metode s pritiskomPrüfung von Frischbeton - Teil 7: Luftgehalte - DruckverfahrenEssais sur béton frais - Partie 7 : Détermination de la teneur en air - Méthode de la compressibilitéTesting fresh concrete - Part 7: Air content - Pressure methods91.100.30Beton in betonski izdelkiConcrete and concrete productsICS:Ta slovenski standard je istoveten z:EN 12350-7:2009SIST EN 12350-7:2009en,fr01-julij-2009SIST EN 12350-7:2009SLOVENSKI
STANDARDSIST EN 12350-7:20011DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12350-7April 2009ICS 91.100.30Supersedes EN 12350-7:2000
English VersionTesting fresh concrete - Part 7: Air content - Pressure methodsEssais pour béton frais - Partie 7 : Teneur en air - Méthodede la compressibilitéPrüfung von Frischbeton - Teil 7: Luftgehalte -DruckverfahrenThis European Standard was approved by CEN on 20 January 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12350-7:2009: ESIST EN 12350-7:2009

Aggregate correction factor – water column method . 16 Annex B (Normative)
Aggregate correction factor – pressure gauge method . 18 Annex C (Normative)
Calibration of apparatus – water column method . 20 Annex D (Normative)
Calibration of apparatus – pressure gauge method . 23
EN 12350 Testing fresh concrete Part 1: Sampling; Part 2: Slump-test;
Part 3: Vebe test;
Part 4: Degree of compactability; Part 5: Flow table test;
Part 6: Density;
Part 7: Air content — Pressure methods; Part 8: Self-compacting concrete - Slump-flow test (in preparation); Part 9: Self-compacting concrete - V-funnel test (in preparation); Part 10: Self-compacting concrete - L-box test (in preparation); Part 11: Self-compacting concrete - Sieve segregation test (in preparation); Part 12: Self-compacting concrete - J-ring test (in preparation). SIST EN 12350-7:2009

1 Scope This European Standard describes two methods for determination of air content of compacted fresh concrete, made with normal weight or relatively dense aggregate of maximum size up to 63 mm. NOTE Neither method is applicable to concretes made with lightweight aggregates, air cooled blast-furnace slag, or aggregates with high porosity, because of the magnitude of the aggregate correction factor, compared with the entrained air content of the 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 12350-1, Testing fresh concrete – Part 1: Sampling EN 12350-6, Testing fresh concrete – Part 6: Density 3 Principles 3.1 General There are two test methods, both of which use apparatus which employ the principle of Boyle-Mariotte's law. For the purpose of reference, the two methods are referred to as the water column method and the pressure gauge method and the apparatus as a water column meter and a pressure gauge meter. 3.2 Water column method Water is introduced to a predetermined height above a sample of compacted concrete of known volume in a sealed container and a predetermined air pressure is applied over the water. The reduction in volume of the air in the concrete sample is measured by observing the amount by which the water level is lowered, the water column being calibrated in terms of percentage of air in the concrete sample. 3.3 Pressure gauge method A known volume of air at a known pressure is merged in a sealed container with the unknown volume of air in the concrete sample. The dial on the pressure gauge is calibrated in terms of percentage of air for the resulting pressure. 4 Water column method 4.1 Apparatus 4.1.1 Water column meter, (see Figure 1), consisting of: a) Container, a cylindrical vessel of steel or other hard metal, not readily attacked by cement paste, having a nominal capacity of at least 5 l and a ratio of diameter to height of not less than 0,75 nor more than 1,25. The outer rim and upper surface of the flange and the interior surfaces of the vessel shall be machined to a smooth finish. The container shall be watertight and in addition it, and the cover assembly, SIST EN 12350-7:2009

a) Zero pressure
b) System operating at pressure P
c) Zero pressure release of pressure P Key: 1 Non-return valve 2 Air vent or valve 3 Bleed valve 4 Mark 5 Water 6 Clamp 7 Concrete 8 Air pump 9 Pressure lowered level h1 (reading at pressure P) h2 (reading at zero pressure after release of pressure P)
Figure 1 — Water column method apparatus NOTE h1 – h2 = A1 when the container holds concrete as shown in Figure 1
h1 – h2 = G (aggregate correction factor) when the container holds only aggregate and water
A1 – G = Ac (air content of concrete)
4.1.2 Means of compacting the concrete, which may be one of the following: a) Internal (poker) vibrator, with a minimum frequency of approximately 120 Hz (7 200 cycles per exceeding approximately one-quarter of the smallest dimension of the test specimen); b) Vibrating table, with a minimum frequency of approximately 40 Hz (2 400 cycles per minute); c) Compacting rod, of circular cross-section, straight, made of steel, having a diameter of approximately 16 mm, length of approximately 600 mm and with rounded ends; d) Compacting bar, straight, made of steel having a square cross-section of approximately
25 mm × 25 mm and length of approximately 380 mm. SIST EN 12350-7:2009

4.2 Procedure 4.2.1 Sampling Obtain the sample of fresh concrete in accordance with EN 12350-1. Remix the sample before carrying out the test 4.2.2 Filling the container and compacting the concrete Using the scoop, place the concrete in the container in such a way as to remove as much entrapped air as possible.
Depending on the consistence of the concrete and the method of compaction, the container shall be filled in one or more layers to achieve full compaction by using one of the methods described in 4.2.3 or 4.2.4.
Typically, concrete having a consistence equivalent to slump class S3 or greater will only require one layer.
In the case of self-compacting concrete, the container shall be filled in one operation and no mechanical compaction shall be applied during filling or after the container is filled. NOTE 1 Full compaction is achieved using mechanical vibration, when there is no further appearance of large air bubbles on the surface of the concrete and the surface becomes relatively smooth with a glazed appearance, without excessive segregation. NOTE 2 The number of strokes per layer required to produce full compaction by hand will depend upon the consistency of the concrete. NOTE 3 Further guidance on methods of compaction for concretes having different consistencies or cast in different sizes of moulds may be given in national annex NA. NOTE 4 The quantity of material used in the final layer shall be sufficient to fill the container without having to remove excess material. A small quantity of additional concrete may be added if necessary and further compacted in order to fill the container, but the removal of excess material should be avoided. SIST EN 12350-7:2009

Key 1 Valve A 2 Valve B 3 Pump 4 Main air valve 5 Pressure gauge 6 Air chamber 7 Air bleeder valve 8 Clamping device 9 Extension tubing for calibration checks 10 Container
Figure 2 — Pressure gauge method apparatus 5.1.2 Means of compacting the concrete, which may be one of the following: a) Internal (poker) vibrator, with a minimum frequency of approximately 120 Hz (7 200 cycles per minute), the diameter of the tube not exceeding approximately one-quarter of the smallest dimension of the test specimen; b) Vibrating table, with a minimum frequency of approximately 40 Hz (2 400 cycles per minute); c) Compacting rod, of circular cross-section, straight, made of steel, with a diameter of approximately 16 mm, length of approximately 600 mm and with rounded ends; d) Compacting bar, straight, made of steel having a square cross-section of approximately
25 mm × 25 mm and length of approximately 380 mm; SIST EN 12350-7:2009

Depending on the consistence of the concrete and the method of compaction, the container shall be filled in one or more layers to achieve full compaction by using one of the methods described in 5.2.3 or 5.2.4.
Typically, concrete having a consistence equivalent to slump class S3 or greater will only require one layer.
In the case of self-compacting concrete, the container shall be filled in one operation and no mechanical compaction shall be applied during filling or after the container is filled. NOTE 1 Full compaction is achieved using mechanical vibration when there is no further appearance of large air bubbles on the surface of the concrete and the surface becomes relatively smooth with a glazed appearance, without excessive segregation. NOTE 2 The number of strokes per layer required to produce full compaction by hand will depend upon the consistency of the concrete. NOTE 3 Further guidance on methods of compaction for concretes having different consistencies or cast in different sizes of moulds may be given in national annex NA. NOTE 4 The qu
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