SIST EN 772-1:2011+A1:2015

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: 22-Sep-2015
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: CAA - Mineral binders and masonry
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jul-2015
• Due Date: 05-Sep-2015
• Completion Date: 23-Sep-2015
• Ref Project: EN 772-1:2011+A1:2015 - Methods of test for masonry units - Part 1: Determination of compressive strength

Relations

• Replaces: SIST EN 772-1:2011 - Methods of test for masonry units - Part 1: Determination of compressive strength
• Effective Date: 01-Oct-2015
• Consolidates: SIST EN 772-1:2011 - Methods of test for masonry units - Part 1: Determination of compressive strength
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 772-1:2011/kFprA1:2015 - Methods of test for masonry units - Part 1: Determination of compressive strength
• Effective Date: 18-Jan-2023

Overview

EN 772-1:2011+A1:2015 - Methods of test for masonry units - Part 1: Determination of compressive strength (CEN) defines a harmonised European test method to determine the compressive strength of masonry units. The standard covers specimen sampling, surface preparation, conditioning, testing machine requirements, loading procedure and reporting. Amendment A1 (2015) updates normative Annex B (surface preparation and conditioning) and confirms the method’s status for CEN members.

Key topics and technical requirements

• Scope: Specifies the procedure to determine compressive strength of masonry units (minimum six specimens unless the product specification requires more).
• Testing machine: Must meet accuracy and repeatability limits (maximum permissible repeatability ≈ 2.0% of indicated force; mean error ±2.0%; zero-force error ±0.4% of range) and be capable of crushing the specimens. Platen stiffness/planeness requirements apply.
• Platen hardness: Bearing faces or auxiliary platens must have a Vickers hardness of at least 600 HV (EN ISO 6507-1).
• Specimen preparation:
  • Surface planeness: faces must be plane to 0.1 mm in any 100 mm and top surface parallelism not greater than 1 mm per 100 mm.
  • Tongues/grooves must be removed; units with frogs are treated depending on net loaded area (if ≤35% the frogs shall be filled with capping mortar).
  • Grinding is allowed but if it significantly alters contact area capping must be used. Composite specimens permitted where grinding reduces height below 40 mm or height/width ratio <0.4.
• Capping: Use cement/sand capping mortar expected to achieve a compressive strength of at least the expected unit strength or 30 N/mm², whichever is less. Typical capping layer ~5 mm, with a minimum bedding thickness of 3 mm.
• Conditioning: Several conditioning regimes are referenced (air-dry, oven-dry, 6% moisture content, immersion); Annex B gives methods for each unit type.
• Result processing: Procedures for calculation, normalisation (fb), evaluation and test reporting are specified.

Applications and users

• Who uses it: Product manufacturers, independent testing laboratories, construction material quality control teams, structural engineers, product certification bodies and regulatory authorities.
• Practical uses:
  • Type testing and routine quality control of bricks, blocks and other masonry units.
  • Verifying compliance with product specifications (EN 771 series) and national regulations.
  • Input for structural design, material selection and research & development of masonry products.
  • Support for CE marking and declaration of performance where applicable.

Related standards

• EN 771 series (masonry unit product specifications - Parts 1–6)
• EN 772 series (other test methods, e.g. Part 2, Part 10, Part 13, Part 16)
• EN 1015-11 (mortar test methods) and EN ISO 6507-1 (Vickers hardness)

Keywords: EN 772-1, masonry units, compressive strength, test method, surface preparation, capping, testing machine, CEN, masonry testing, product conformity.

Standards Content (Sample)

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

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

Conversion of the compressive strength of masonry units to the normalised compressive strength . 12 Annex B (normative)
Surface preparation and conditioning of units . 13
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

% 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
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