1、BRITISH STANDARDBS EN14488-7:2006Testing sprayed concrete Part 7: Fibre content of fibre reinforced concreteThe European Standard EN 14488-7:2006 has the status of a British StandardICS 91.100.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g3
2、8g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14488-7:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 April 2006 BSI 2006ISBN 0 580 48235 9National forewordThis British Standard is
3、 the official English language version of EN 14488-7:2006.The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/10, Sprayed concrete, which has the responsibility to: A list of organizations represented on this subcommittee can be obtaine
4、d on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of th
5、e BSI Electronic Catalogue or of British Standards Online.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 does not of itself confer immunity from legal obligations. aid enqu
6、irers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document
7、comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROP
8、ENNEEUROPISCHE NORMEN 14488-7April 2006ICS 91.100.30English VersionTesting sprayed concrete - Part 7: Fibre content of fibrereinforced concreteEssais pour bton projet - Partie 7 : Teneur en fibres dubton renforc par des fibresPrfung von Spritzbeton - Teil 7: Fasergehalt vonfaserverstrktem BetonThis
9、European Standard was approved by CEN on 27 February 2006.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 reference
10、s concerning such nationalstandards may be obtained on application to the Central Secretariat 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
11、own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembou
12、rg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of
13、exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14488-7:2006: EEN 14488-7:2006 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Apparatus .4 5 Test specimens4 5.1 General4 5.2 Hardened sample (Method A) .5 5.3 Fresh samp
14、le (Method B)5 6 Procedures .5 6.1 General5 6.2 Volume of hardened specimen (Method A).5 6.3 Volume of fresh specimen (Method B) 5 6.4 Mass of fibres from hardened sample (Method A).5 6.5 Mass of fibres from fresh sample (Method B) 5 7 Expression of results 6 8 Test report 6 9 Accuracy.6 EN 14488-7:
15、2006 (E) 3 Foreword This European Standard (EN 14488-7:2006) 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 te
16、xt or by endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latest by December 2007. This European Standard is part of a series concerned with testing sprayed concrete. This series EN 14488 Testing sprayed concrete includes the following parts: P
17、art 1: Sampling fresh and hardened concrete Part 2: Compressive strength of young sprayed concrete Part 3: Flexural strengths (first peak, ultimate and residual) of fibre reinforced beam specimens Part 4: Bond strength of cores by direct tension Part 5: Determination of energy absorption capacity of
18、 fibre reinforced slab specimens Part 6: Thickness of concrete on a substrate Part 7: Fibre content of fibre reinforced concrete According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria,
19、Belgium, 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. EN 14488-7:2006 (E) 4 1 Scop
20、e This part of European Standard specifies a method for the determination of the fibre content of sprayed concrete from either a fresh or hardened (i.e. before or after set) concrete sample. Only the method using a fresh sample is appropriate with polymer fibres, while both types are applicable with
21、 steel fibres. 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 12350-6,
22、 Testing fresh concrete - Part 6: Density EN 12390-7, Testing hardened concrete - Part 7: Density of hardened concrete EN 12504-1, Testing concrete in structures - Part 1: Cored specimens - Testing, examining and testing in compression EN 14488-1, Testing sprayed concrete - Part 1: Sampling fresh an
23、d hardened concrete 3 Principle Fibres are extracted from a hardened (Method A) or fresh (Method B) concrete sample and the fibre content is determined from their mass and the volume of the concrete sample. 4 Apparatus 4.1 Balance or scale capable of determining the mass of the concrete sample and e
24、xtracted fibres to the required accuracy. 4.2 Container to support and suspend a sample in water in order to determine its mass. 4.3 Water tank suitable for the immersion of samples in water at (20 2) C. 4.4 Trowel, or similar cutting device, made from a non-absorbent material not readily attacked b
25、y cement paste, suitable for cutting a concrete sample from fresh, in situ sprayed concrete. 5 Test specimens 5.1 General Fresh samples may be extracted from the basic mix, the in situ material or from a test panel. Hardened samples may be cut from the in situ material or from a test panel. It shoul
26、d be noted that the fibre content at each of these locations may be different, due to the spraying process. The most appropriate sample type and location should be used, which will depend on the purpose of the quality control and on the compliance requirements of the specification. For hardened samp
27、les the test may be conducted in as received, saturated or oven-dried moisture states. EN 14488-7:2006 (E) 5 5.2 Hardened sample (Method A) Three test cores shall be cut from the in situ material or a test panel in accordance with the requirements of EN 14488-1 and EN 12504-1. The core diameter shal
28、l be between 50 mm and 100 mm, and the core length shall be between 75 mm and 150 mm (unless the layer thickness is less than 75 mm, in which case the core length should equal the layer thickness). 5.3 Fresh sample (Method B) Three test samples (coupons) shall be cut from the in situ material or a t
29、est panel with a trowel or similar tool. Fibres protruding from the remaining material shall not be extracted and added to the sample. Wherever possible, each coupon should consist of a single piece of sprayed concrete cut from the full depth of the sprayed concrete layer or panel. The latter is to
30、ensure a representative sample is obtained, taking into account any differences in fibre content with depth. Each sample should weigh between 1 kg and 2 kg. 6 Procedures 6.1 General The volume of the sample (before fibre extraction) is determined by calculation (using actual dimensions) or by water
31、displacement (reference method). The mass of the fibres is then determined by weighing, following extraction of the fibres from the fresh or hardened sample. 6.2 Volume of hardened specimen (Method A) The volume (Vd) of each core shall be determined according to the calculation (using actual dimensi
32、ons) or weighing in water methods given in EN 12390-7. The hardened density may also be determined in accordance with EN 12350-6. 6.3 Volume of fresh specimen (Method B) The volume (Vd) of each coupon shall be determined by the weighing in water method given in EN 12350-6. Each coupon is weighed in
33、air, then upon immersion in water. The wet density and volume of the sample are then calculated. These measurements shall be made before final set of the concrete if the fibres are to be extracted according to 6.5. 6.4 Mass of fibres from hardened sample (Method A) The concrete core shall be crushed
34、 in a compression testing machine, or other suitable device, so that all the fibres can be separated from the concrete. Magnetic fibres can be easily removed by a magnet. The fibres shall be cleaned mechanically to remove any cementitious residue that is clearly visible by naked eye, and then weighe
35、d (mf) to 0,1g. 6.5 Mass of fibres from fresh sample (Method B) Wash out the fibres from the sprayed concrete sample. The sprayed concrete shall be placed in a sieve or filter equipment where the cement and other fine materials can be washed out such that the fibres can be separated from the mass. W
36、ith synthetic fibres the sample may be soaked with alcohol and stirred until the fibres float on the surface. The fibres shall be cleaned, dried and then weighed (mf) to 0,1 g for steel fibres or 0,01 g for polymer fibres. EN 14488-7:2006 (E) 6 7 Expression of results The fibres content shall be cal
37、culated from the determined fibres mass and sample volume, using the formula: dffVmC1000=(1) where Cfis the fibres content in kg/m3mfis the mass of fibres extracted from the sample in g Vdis the volume of the sample in m38 Test report The report shall include: a) identification of the test specimen;
38、 b) description of the fibres type; c) description of the method (A or B); d) mass of each specimen to nearest 10 g; e) mass of the fibres in each specimen to nearest 0,1 or 0,01 g as appropriate; f) calculated fibres content of each specimen to nearest 1 kg/m3; g) the average value of fibres conten
39、t and the standard deviation; h) any deviation from this standard; i) declaration from the person technically responsible for the test that the testing was carried out in accordance with this standard, except as detailed in item h). The report may also include: j) density (fresh or hardened) of each
40、 specimen to nearest 10 kg/m3. 9 Accuracy There are currently no accuracy data for this test. blankBS EN 14488-7:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on stan
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