Methods of test for masonry units - Part 22: Determination of freeze/thaw resistance of clay masonry units

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

Prüfverfahren für Mauersteine - Teil 22: Bestimmung des Frost-Tau-Widerstandes von Mauerziegeln

Dieses Dokument legt ein Verfahren zur Bestimmung des Frost-Tau-Widerstands von Mauerziegeln in den Kategorien F1 oder F2 fest.

Méthodes d'essai des éléments de maçonnerie - Partie 22: Détermination de la résistance au gel/dégel des éléments de maçonnerie en terre cuite

Le présent document spécifie une méthode permettant de déterminer la résistance au gel/dégel des éléments de maçonnerie en terre cuite dans l’une des deux catégories F1 ou F2.

Metode preskušanja zidakov - 22. del: Ugotavljanje odpornosti proti zmrzovanju/tajanju opečnih zidakov

Ta dokument določa metodo za ugotavljanje odpornosti proti zmrzovanju/tajanju opečnih zidakov v eni od kategorij F1 ali F2.

General Information

Status
Published
Publication Date
11-Dec-2018
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
12-Dec-2018
Completion Date
12-Dec-2018

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SLOVENSKI STANDARD
SIST EN 772-22:2019
01-februar-2019
1DGRPHãþD
SIST-TS CEN/TS 772-22:2006
0HWRGHSUHVNXãDQMD]LGDNRYGHO8JRWDYOMDQMHRGSRUQRVWLSURWL
]PU]RYDQMXWDMDQMXRSHþQLK]LGDNRY

Methods of test for masonry units - Part 22: Determination of freeze/thaw resistance of

clay masonry units

Prüfverfahren für Mauersteine - Teil 22: Bestimmung des Frost-Tau-Widerstandes von

Mauerziegeln
Méthodes d'essai des éléments de maçonnerie - Partie 22: Détermination de la
résistance au gel/dégel des éléments de maçonnerie en terre cuite
Ta slovenski standard je istoveten z: EN 772-22:2018
ICS:
91.100.25 Gradbeni izdelki iz terakote Terracotta building products
SIST EN 772-22:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 772-22:2019
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SIST EN 772-22:2019
EN 772-22
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2018
EUROPÄISCHE NORM
ICS 91.100.25 Supersedes CEN/TS 772-22:2006
English Version
Methods of test for masonry units - Part 22: Determination
of freeze/thaw resistance of clay masonry units

Méthodes d'essai des éléments de maçonnerie - Partie Prüfverfahren für Mauersteine - Teil 22: Bestimmung

22: Détermination de la résistance au gel/dégel des des Frost-Tau-Widerstandes von Mauerziegeln

éléments de maçonnerie en terre cuite
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 COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 772-22:2018 E

worldwide for CEN national Members.
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SIST EN 772-22:2019
EN 772-22:2018 (E)
Contents Page

European Foreword ...................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

4 Principle ............................................................................................................................................................. 4

5 Apparatus ........................................................................................................................................................... 4

6 Materials ............................................................................................................................................................. 5

7 Preparation of specimens ............................................................................................................................ 5

7.1 Sampling ............................................................................................................................................................. 5

7.2 Water absorption ............................................................................................................................................ 5

7.3 Conditioning and preparation of specimens ......................................................................................... 5

8 Construction of a test panel ......................................................................................................................... 6

8.1 General ................................................................................................................................................................ 6

8.2 Conditioning of a test panel ......................................................................................................................... 8

8.2.1 General ................................................................................................................................................................ 8

8.2.2 Partial saturation by cold water immersion ......................................................................................... 8

8.2.3 Partial saturation by immersion in water at 80°C .............................................................................. 8

9 Procedure of freezing and thawing .......................................................................................................... 8

9.1 General ................................................................................................................................................................ 8

9.2 Freeze/thaw cycling ....................................................................................................................................... 8

9.2.1 General ................................................................................................................................................................ 8

9.2.2 Freezing period ................................................................................................................................................ 9

9.2.3 Thawing period ................................................................................................................................................ 9

9.2.4 Reconditioning after an interruption ...................................................................................................... 9

9.3 Examination of test panel and units ......................................................................................................... 9

10 Evaluation of results ...................................................................................................................................... 9

10.1 Assessment of damage .................................................................................................................................. 9

10.2 Assessment of freeze/thaw resistance ................................................................................................. 10

11 Test report ...................................................................................................................................................... 12

Annex A (informative) Heat flow meter ............................................................................................................ 14

Annex B (normative) Calibration — Measurement of rate of spray water ........................................... 16

Annex C (normative) Calibration — Measurement of heat transfer rate .............................................. 17

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SIST EN 772-22:2019
EN 772-22:2018 (E)
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.

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SIST EN 772-22:2019
EN 772-22:2018 (E)
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

The following documents are referred to in the text in such a way that some or all of their content constitutes

requirements 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 772-21, Methods of test for masonry units — Part 21: Determination of water absorption of clay and calcium

silicate masonry units by cold water absorption

EN 197-1, Cement — Part 1: Composition, specifications and conformity criteria for common cements

EN 13139, Aggregates for mortar
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Principle

A panel of clay masonry units is assembled from units and rapid hardening mortar which when sufficiently

hardened is immersed in water for a prescribed period of time. The panel is subsequently cooled for a specified

period and the water in the units near to one face is repeatedly thawed and refrozen while the rear of the panel

remains permanently frozen (achieving a so called pinch effect). Damage caused by the freezing and thawing

action is assessed and used to determine the freeze/thaw resistance of the bricks.

5 Apparatus

An appropriate testing machine capable of generating the freeze–thaw cycles specified in 9.2 and ensuring

unidirectional freezing and thawing through one face of the units.

Several different designs of testing machines are suitable all of which use a fan to circulate air in the machine.

It is important that the machine circulates the air such that the flow is essentially parallel to the face of the

panel under test.
A water tank for soaking, made of plastic or steel.

A heat flow meter. The heat flow meter is an insulated device for extracting heat over the central area of the

surface of what during a test would be the exposed face of the panel. The area is matt black and shall be capable

of extracting heat such that when the air temperature is recorded as −15°C as in 9.2.2 and the centre of the

plate is maintained at 0°C the average rate of heat extraction can be measured. A typical example is described

in Annex A and a suitable calibration procedure in Annex C.
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SIST EN 772-22:2019
EN 772-22:2018 (E)
6 Materials
High alumina cement shall conform to EN 197-1.

Sand shall conform to EN 13139 with a grain size distribution between the limits shown in Figure 1.

Mesh width in mm
Figure 1 — Grain size distribution
7 Preparation of specimens
7.1 Sampling

The method of sampling shall be in accordance with EN 771-1. Sufficient units shall be sampled in order to

2 2

construct a panel with a face which has a surface area in between 0,25 m and 0,5 m . Each unit shall be

numbered.
7.2 Water absorption

All units selected to construct the panel may be characterized for their water absorption following the

procedure described in EN 772-21.
7.3 Conditioning and preparation of specimens

If the water absorption has been determined, all of the units shall be left to dry individually for at least one day

under laboratory conditions. Units, the headers of which are exposed in the panel, shall be cut and, if necessary,

shortened in order to prevent part of the cut unit from protruding at the rear of the panel. Both half units shall

be renumbered with the original unit number and e.g. the addition a and b.
Percentage by weight passing
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SIST EN 772-22:2019
EN 772-22:2018 (E)
8 Construction of a test panel
8.1 General

Test panels shall be constructed from units with the identifying marks visible on the face of the panel to be

exposed and a rapid setting high alumina cement mortar.

NOTE The mortar needs to be strong enough and provide adequate adhesion such that panels can be handled safely

but which is not so strong as to make dismantling the panel after testing difficult. This has been achieved in different

laboratories by using a cement:sand mix of 1:4 or 1:6 by volume depending on the characteristics of the sand used. For

product development or factory production control some laboratories find it more convenient to form the joints of

neoprene rubber or similar. Wherever testing is carried out to test the validity of a manufacturer’s declaration, mortar

joints should be used in accordance with this clause.

If the initial rate of water absorption needs to be adjusted before laying, the bricks should be wetted.

A typical panel is shown in Figure 2. Cut units at the end of courses shall be turned so that the header of the

unit forms part of the face of the panel to be exposed to the freeze/thaw cycles. The depth of these header faced

units should be equal to the width of the full units in order to create such a plane that in the freeze/thaw test

the panel can be fitted closely to the insulation at the rear. A layer of foam rubber should be used at the rear

face such that the flow of air in any gap is eliminated.
The panel height should be limited to 0,75 m.

The mortar joints shall be finished with a steel tool to give a flush finish on the front and back faces of the

panels as shown in Figure 3. Sufficient units shall be used to construct a panel measuring between 0,25 m and

0,5 m .
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SIST EN 772-22:2019
EN 772-22:2018 (E)
Dimensions in millimetres
Key
1 Header
2 Stretcher
3 Mortar joint
4 Foam rubber
5 Insulation
6 Foam rubber
Figure 2 — Typical test panel
Key
1 Masonry unit
2 Flush finish to mortar joint
Figure 3 — Joint finish
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SIST EN 772-22:2019
EN 772-22:2018 (E)
8.2 Conditioning of a test panel
8.2.1 General

The test panel shall be allowed to cure in ambient laboratory conditions for at least 3 days. Each unit in the

panel shall than be examined. Any existing defects shall be noted with a water proof marker. The situation

(with or without markings) shall be captured by means of a high resolution photograph.

The panel will then be partially saturated by one of the two methods given below.

8.2.2 Partial saturation by cold water immersion

The panel will be completely immersed in a tank of water at room temperature for 7 days ± 8 h.

8.2.3 Partial saturation by immersion in water at 80°C

The panel is immersed in an insulated tank filled with tap water at room temperature. The tank is closed and

the water temperature is raised to (80 ± 3)°C within a period of 2 to 5 hours. The temperature is maintained

for a total of (24 ± 1) hours including a 2 to 5 hours temperature rise. The temperature is then decreased to

room temperature within a period of 2 to 5 hours. This is done by gradually putting tap water at room

temperature into the tank. In this condition the panel remains until the total immersion time from the start of

the process is at least 44 hours and not more than 56 hours.
9 Procedure of freezing and thawing
9.1 General
All faces of the panel except tha
...

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