Methods of test for masonry units - Part 1: Determination of compressive strength

This European Standard specifies a method for determining the compressive strength of masonry units.

Prüfverfahren für Mauersteine - Teil 1: Bestimmung der Druckfestigkeit

Diese Europäische Norm legt ein Verfahren zur Bestimmung der Druckfestigkeit von Mauersteinen fest.

Méthodes d'essai des éléments de maçonnerie - Partie 1: Détermination de la résistance à la compression

La présente Norme européenne spécifie une méthode permettant de déterminer la résistance à la compression des éléments de maçonnerie.

Metode preskušanja zidakov - 1. del: Določevanje tlačne trdnosti

Ta evropski standard določa metodo za določevanje tlačne trdnosti zidakov.

General Information

Status
Published
Publication Date
23-Jun-2015
Technical Committee
Current Stage
9093 - Decision to confirm - Review Enquiry
Due Date
15-Dec-2016
Completion Date
21-Nov-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prüfverfahren für Mauersteine - Teil 1: Bestimmung der DruckfestigkeitMéthodes d'essai des éléments de maçonnerie - Partie 1: Détermination de la résistance à la compressionMethods of test for masonry units - Part 1: Determination of compressive strength91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:Ta slovenski standard je istoveten z:EN 772-1:2011+A1:2015SIST EN 772-1:2011+A1:2015en,fr,de01-oktober-2015SIST EN 772-1:2011+A1:2015SLOVENSKI

STANDARDSIST EN 772-1:20111DGRPHãþD
SIST EN 772-1:2011+A1:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 772-1:2011+A1
June 2015 ICS 91.100.25 Supersedes EN 772-1:2011English Version

Methods of test for masonry units - Part 1: Determination of compressive strength

Méthodes d'essai des éléments de maçonnerie - Partie 1: Détermination de la résistance à la compression

Prüfverfahren für Mauersteine - Teil 1: Bestimmung der Druckfestigkeit This European Standard was approved by CEN on 25 December 2010 and includes Amendment 1 approved by CEN on 14 May 2015.

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-CENELEC 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-CENELEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-1:2011+A1:2015 ESIST EN 772-1:2011+A1:2015

EN 772-1:2011+A1:2015 (E) 2 Contents Page Foreword ..............................................................................................................................................................3 1 Scope ......................................................................................................................................................4 2 Normative references ............................................................................................................................4 3 Principle ..................................................................................................................................................4 4 Symbols ..................................................................................................................................................4 5 Materials .................................................................................................................................................5 6 Apparatus ...............................................................................................................................................5 6.1 Testing machine.....................................................................................................................................5 6.2 Weighing instrument .............................................................................................................................5 6.3 Sufficient stiff steel strips .....................................................................................................................5 7 Preparation of specimens .....................................................................................................................5 7.1 Sampling .................................................................................................................................................5 7.2 Surface preparation ...............................................................................................................................6 7.2.1 General ....................................................................................................................................................6 7.2.2 Removal of tongues and grooves ........................................................................................................6 7.2.3 Preparation of masonry units containing frogs and which are not to be capped ..........................6 7.2.4 Grinding ..................................................................................................................................................6 7.2.5 Capping ...................................................................................................................................................7 7.3 Conditioning of specimens before testing ..........................................................................................8 7.3.1 General ....................................................................................................................................................8 7.3.2 Conditioning to the air dry condition...................................................................................................8 7.3.3 Conditioning to the oven dry condition ..............................................................................................8 7.3.4 Conditioning to 6 % moisture content .................................................................................................8 7.3.5 Conditioning by immersion ..................................................................................................................9 7.4 Loaded area ............................................................................................................................................9 7.4.1 Gross area ..............................................................................................................................................9 7.4.2 Net loaded area of units containing frogs intended to be filled with mortar in practice ................9 8 Procedure ...............................................................................................................................................9 8.1 Placing specimens in the testing machine .........................................................................................9 8.2 Loading ...................................................................................................................................................9 9 Calculation and expression of results .............................................................................................. 10 10 Evaluation of results .......................................................................................................................... 10 11 Test report ........................................................................................................................................... 10 Annex A (informative)

Conversion of the compressive strength of masonry units to the normalised compressive strength .................................................................................................... 12 Annex B (normative)

Surface preparation and conditioning of units ....................................................... 13

SIST EN 772-1:2011+A1:2015

EN 772-1:2011+A1:2015 (E) 3 Foreword This document (EN 772-1:2011+A1:2015) has been prepared by Technical Committee CEN/TC 125 “Masonry”, the secretariat of which is held by BSI. 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 December 2015, and conflicting national standards shall be withdrawn at the latest by December 2015. 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. This document supersedes !EN 772-1:2011." This document includes Amendment 1 approved by CEN on 2015-04-14. The start and finish of text introduced or altered by amendment is indicated in the text by tags !". There have been no technical changes compared to EN 772-1:2000. The opportunity has been taken to introduce a normative Annex B which includes the methods of surface preparation and conditioning for each unit type. This information was previously available in the product specifications only, consequently EN 771-1 now becomes a stand-alone document. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 772-1:2011+A1:2015

EN 772-1:2011+A1:2015 (E) 4 1 Scope This European Standard specifies a method for determining the compressive strength of masonry units. 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 771-1, Specification for masonry units — Part 1: Clay masonry units EN 771-2, Specification for masonry units — Part 2: Calcium silicate masonry units EN 771-3, Specification for masonry units — Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates) EN 771-4, Specification for masonry units — Part 4: Autoclaved aerated concrete masonry units EN 771-5, Specification for masonry units — Part 5: Manufactured stone masonry units EN 771-6, Specification for masonry units — Part 6: Natural stone masonry units EN 772-2, Methods of test for masonry units — Part 2: Determination of percentage area of voids in aggregate concrete masonry units (by paper indentation) EN 772-10, Methods of test for masonry units — Part 10: Determination of moisture content of calcium silicate and autoclaved aerated concrete units EN 772-13, Methods of test for masonry units — Part 13: Determination of net and gross dry density of masonry units (except for natural stone) EN 772-16, Methods of test for masonry units — Part 16: Determination of dimensions EN 1015-11, Methods of test for mortar for masonry — Part 11: Determination of flexural and compressive strength of hardened mortar EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1:2005) 3 Principle The specimens, after preparation, when needed, are laid and centred on the platen of a compression testing machine. A uniformly distributed load is applied and increased continuously up to failure. 4 Symbols fb

normalised compressive strength of masonry unit (N/mm2); d shape factor multiplier used to convert the air-dry compressive strength of the masonry specimens to the normalised compressive strength. SIST EN 772-1:2011+A1:2015

EN 772-1:2011+A1:2015 (E) 5 5 Materials Sand with a maximum grain size of 1 mm. Cement 6 Apparatus 6.1 Testing machine that conforms to the requirements of Table 1. Table 1 — Requirements for testing machines Maximum permissible repeatability of forces as percentage of indicated force

% Maximum permissible mean error of forces as percentage of indicated force

% Maximum permissible error of zero force as percentage of maximum force of range

% 2,0 ± 2,0 ± 0,4 The testing machine shall have adequate capacity to crush all the test specimens, but the scale used shall be such that the failure load on the specimen exceeds one-fifth of the full scale reading. The machine shall be provided with a load-pacer or equivalent means to enable the load to be applied at the rate given in 8.2. The testing machine shall be equipped with two steel-bearing platens. The stiffness of the platens and the manner of load transfer shall be such that the deflection of the platen surfaces at failure load shall be less than 0,1 mm measured over 250 mm. The platens shall either be through hardened or the faces case hardened. The testing faces shall have a Vickers hardness of at least 600 HV when tested in accordance with EN ISO 6507-1. One platen of the machine shall be able to align freely with the specimens as contact is made, but shall be restrained by friction or other means from tilting during loading. The other platen shall be a plane non-tilting block. The bearing faces of both platens shall be larger than the size of the largest specimen to be tested. Where auxiliary platens are used, they shall be properly located and of the same hardness, stiffness and planeness as the main platens. The bearing surfaces of the platens shall not depart from a plane by more than 0,05 mm. 6.2 Weighing instrument capable of weighing specimens to an accuracy of 0,1 % of their mass. 6.3 Sufficient stiff steel strips for use on shell bedded or strip bedded ground units (See 8.1). 7 Preparation of specimens 7.1 Sampling The method of sampling shall be in accordance with the relevant part of EN 771. The minimum number of specimens shall be six, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. In the case of large masonry units representative portions, e.g. cubes, may be cut from the masonry unit in different positions as stated in the relevant part of EN 771 (see also Note to 7.2.4). SIST EN 772-1:2011+A1:2015

EN 772-1:2011+A1:2015 (E) 6 7.2 Surface preparation 7.2.1 General Specimens shall be tested in the orientation specified, and this shall be stated in the test report. For certain forms of construction, it will be necessary to test the masonry units in more than one orientation. Where grinding in accordance with 7.2.4 significantly alters the contact surface or reduces the height significantly alternative approaches are required, see 7.2.4. Where it is not practicable to prepare clay HD units by grinding e.g. high strength units, the surface preparation may be carried out by capping in accordance with 7.2.5 After the removal of any superfluous material, e.g. flashing from the production process, the faces of the specimen, whether a whole masonry unit or a piece cut from a larger unit (see 7.1), through which the load is to be applied, shall be plane to a tolerance of 0,1 mm in any 100 mm and such that the top surface lies between two parallel planes which are parallel to the bottom surface, and not greater than 1 mm apart for every 100 mm. If the test faces of the masonry unit as manufactured, or the piece cut from a larger unit, fail to achieve this specification, then prepare the surfaces either by grinding (see 7.2.4) or by capping (see 7.2.5). Masonry units containing frogs, and not required to be capped, shall additionally be treated as given in 7.2.3. If the specimens contain grooves or tongues first prepare them as given in 7.2.2. Test specimens shall be prepared in accordance with Annex B. State the method of surface preparation in the test report. 7.2.2 Removal of tongues and grooves Remo

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