EN 772-5:2016

SLOVENSKI STANDARD
01-junij-2016
1DGRPHãþD
SIST EN 772-5:2002
0HWRGHSUHVNXãDQMD]LGDNRYGHO'RORþHYDQMHYRGRWRSQLKVROLYRSHþQLK
]LGDNLK
Methods of test for masonry units - Part 5: Determination of the active soluble salts
content of clay masonry units
Prüfverfahren für Mauersteine - Teil 5: Bestimmung des Gehalts an aktiven löslichen
Salzen von Mauerziegeln
Méthodes d'essai des éléments de maçonnerie - Partie 5: Détermination de la teneur en
sels solubles actifs des éléments de maçonnerie en terre cuite
Ta slovenski standard je istoveten z: EN 772-5:2016
ICS:
91.100.25 Gradbeni izdelki iz terakote Terracotta building products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 772-5
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 91.100.25 Supersedes EN 772-5:2001
English Version
Methods of test for masonry units - Part 5: Determination
of the active soluble salts content of clay masonry units
Méthodes d'essai des éléments de maçonnerie - Partie Prüfverfahren für Mauersteine - Teil 5: Bestimmung
5: Détermination de la teneur en sels solubles actifs des des Gehalts an aktiven löslichen Salzen von
éléments de maçonnerie en terre cuite Mauerziegeln
This European Standard was approved by CEN on 3 January 2016.

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
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 772-5:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Principle . 4
4 Symbols . 4
5 Materials . 4
5.1 For all methods . 4
5.2 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry . 5
5.3 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry
or inductively coupled plasma spectrometry (ICP) . 5
5.4 EDTA method (alternative) . 5
6 Apparatus . 5
7 Preparation of sample . 6
7.1 Sampling . 6
7.2 Crushing . 6
8 Extraction procedure . 6
9 Determinations of cations by instrumental techniques . 6
9.1 General . 6
9.2 Atomic absorption spectroscopy method (AAS) and flame photometry . 6
9.2.1 Sample preparation . 6
9.2.2 Calibration: preparation of the reference series . 7
9.2.3 Spectroscopic lines and parameters for AAS and flame photometry analysis . 7
9.3 Inductively coupled plasma spectrometry method (ICP) . 8
9.3.1 General . 8
9.3.2 Spectroscopic lines for ICP analysis . 8
9.4 Calculation of the results . 8
10 Alternative method of determination of the content of active soluble salts . 9
10.1 Preparations of reagents for magnesium determination . 9
10.1.1 Magnesium test solution (1,0 mg Mg/ml) . 9
10.1.2 Preparation of EDTA test solution (0,5 %) . 9
10.2 First titration (calcium plus magnesium) . 9
10.3 Second titration (calcium) . 9
10.4 Magnesium content . 9
10.5 Determination of sodium and potassium . 9
11 Expression of results . 10
12 Test report . 10

European foreword
This document (EN 772-5:2016) 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 September 2016, and conflicting national standards
shall be withdrawn at the latest by December 2017.
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 772-5:2001.
The crushing procedure in 7.2 has been amended so that the sample, after reducing to particles of not
greater than approximately 1 mm in size, is dried in a ventilated oven to constant mass prior to further
grinding and sieving.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
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.
1 Scope
This European Standard specifies a method for determining the active soluble salts content of clay
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
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
ISO 3310-2, Test sieves — Technical requirements and testing — Part 2: Test sieves of perforated metal
plate
3 Principle
The method adopted is based on water extraction from a crushed representative sample of the clay
masonry units, and determines the amounts of soluble magnesium, sodium and potassium ions,
released under the test conditions, which may be correlated with the potentially damaging effect of
salts of those ions on cementitious mortars in certain circumstances, or even on the units themselves.
These salts are known as «active» soluble salts in EN 771-1.
4 Symbols
M is the number of milligrams of Mg equivalent to 1 ml of EDTA
Mg
x,y is the volume of EDTA titrated, en millilitres (ml)
C is the lower reference sample concentration, in percentage (%)
C is the higher reference sample, concentration, in percentage (%)
C is the sample concentration, in percentage (%)
x
E is the measured signal for the lower reference sample concentration C
1 1
E is the measured signal for the higher reference sample, concentration C
2 2
E is the measured signal for sample
x
d is the dilution factor
5 Materials
5.1 For all methods
Distilled or deionized water for extraction of active soluble salts from the sample, and for preparation of
analytical test solutions.
Hydrochloric acid (relative density 1,18).
All chemicals shall be of analytical reagent grade.
5.2 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry
Hydrated Lanthanum chloride LaCL ∙ 7H O, 210 g/l Solution
3 2
Caesium Chloride CsCl, 63 g/l Solution
5.3 Instrumental method Atomic Absorption Spectroscopy (AAS) and flame photometry
or inductively coupled plasma spectrometry (ICP)
High purity standard solutions
5.4 EDTA method (alternative)
Magnesium metal
Ethylenediamine tetra acetic acid (EDTA) Indicators: Calcein
Methyl thymol blue complexone
Potassium hydroxide
Ammonia solution (relative density 0,88)
Potassium nitrate
6 Apparatus
6.1 Test sieves, complying with the requirements of ISO 3310-1, ISO 3310-2
6.2 Mortar or other suitable grinding equipment capable of producing particles to pass a 150 μm test
sieve.
6.3 Polyethylene bottle or Conical flask, typically with a capacity 500 ml
6.4 Weighing instrument, readable to the nearest 0,1 mg
6.5 Burette, typically 10 ml
6.6 Pipette, typically 10 ml, 50 ml
6.7 Graduated flask, typically 1 l
6.8 Volumetric flask, typically 100 ml
−1
6.9 One dimensional horizontal shaking equipment, capable of oscillating at (120 ± 5) min
having a horizontal movement of 20 mm, or a rotary shaker capable of revolving at 30 ± 3 revolutions
per minute.
6.10 Polyethylene bottle, typically with a capacity of between 1 l and 1,5 l.
6.11 Ventilated oven, capable of maintaining a temperature of (105 ± 5) °C
7 Preparation of sample
7.1 Sampling
The method of sampling shall be in accordance with EN 771-1. The minimum number of specimens for
the determination of the active soluble salts content shall be six and shall comprise whole units but a
larger number may be specified in the product specification, in which case that larger number shall be
used. The specimens shall be sampled in such a manner that they have not been exposed to water that
would lead to leaching of soluble salts from the units.
From the bulk sample of units a representative sample of 50 g to 250 g of material, ground to pass a
150 µm test sieve (6.1), is prepared, using the crushing method described in 7.2.
7.2 Crushing
Crush each unit to give lumps not greater than 10 mm. Obtain from each crushed specimen a
representative subsample of at least 50 g, either by coning and quartering or using a suitable
mechanical sampling device. Mix this material and crush it to give particles not greater than
approximately 1 mm. Reduce the prepared sample to 50 g to 250 g using the same splitting method.
Dry the crushed sample to constant mass in a ventilated oven at a temperature of (105 ± 5) °C. Befor
...