National foreword

This British Standard is the UK implementation of EN 772‑22:2018.

The UK participation in its preparation was entrusted to Technical Committee B/519, Masonry and associated 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 31 January 2019.

This European Standard was approved by CEN on 26 October 2018.

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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

European Foreword

This document (EN 772‑22:2018) 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of an identical text or by endorsement, at the latest by June 2019, and conflicting national standards shall be withdrawn at the latest by June 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes CEN/TS 772‑22:2006.

The most significant changes compared to the previous edition include:

definition for sand grading for mortar has been tightened;
rubber joints between units are only permitted for product development and factory production control testing;
a clause for partial saturation at 80 °C is added;
only flush finish joints are permitted;
monitoring of temperature is taken from 30 mm from the face not 40 mm;
classification as F2 is given if not more than 10% of units exhibit damage of Type 4 or above, rather than no units of type 4 or above;
classifications of F1(n) and F2(80°C) are added;
a detailed description of a heat flow meter is provided.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

1 Scope

This document specifies a method for determining the freeze/thaw resistance of clay masonry units in one of two categories F1 or F2.

2 Normative references

3 Terms and definitions

4 Principle

5 Apparatus

6 Materials

7 Preparation of specimens

7.1 Sampling

7.2 Water absorption

7.3 Conditioning and preparation of specimens

8 Construction of a test panel

8.1 General

8.2 Conditioning of a test panel

9 Procedure of freezing and thawing

9.1 General

9.2 Freeze/thaw cycling

9.3 Examination of test panel and units

10 Evaluation of results

10.1 Assessment of damage

10.2 Assessment of freeze/thaw resistance

11 Test report

BS EN 772-22:2018

Methods of test for masonry units - Determination of freeze/thaw resistance of clay masonry units

Current, Under Review

Published:

31 Jan 2019