Aggregates for concrete — Test methods for chemical properties — Part 2: Determination of soluble sulfate salts

This document describes the procedure for the determination of soluble sulfate salts which can be present in aggregates. The test is suitable for aggregates where the sulfate content derives directly from contact with, or immersion in, saline water, e.g. typical sea-dredged aggregates.

Granulats pour béton — Méthodes d'essai relatives aux propriétés chimiques — Partie 2: Dosage des sels de sulfate solubles

General Information

Status
Published
Publication Date
09-Jan-2023
Current Stage
6060 - International Standard published
Due Date
11-Feb-2023
Completion Date
10-Jan-2023
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ISO 24684-2:2023 - Aggregates for concrete — Test methods for chemical properties — Part 2: Determination of soluble sulfate salts Released:10. 01. 2023
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INTERNATIONAL ISO
STANDARD 24684-2
First edition
2023-01
Aggregates for concrete — Test
methods for chemical properties —
Part 2:
Determination of soluble sulfate salts
Granulats pour béton — Méthodes d'essai relatives aux propriétés
chimiques —
Partie 2: Dosage des sels de sulfate solubles
Reference number
ISO 24684-2:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 24684-2:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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Published in Switzerland
© ISO 2023 – All rights reserved
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ISO 24684-2:2023(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 General ........................................................................................................................................................................................................................... 1

5 Reagents ........................................................................................................................................................................................................................ 2

5.1 General ........................................................................................................................................................................................................... 2

5.2 Reagents for determination of acid-soluble sulfates ............................................................................................ 2

5.3 Apparatus .................................................................................................................................................................................................... 2

6 General requirements for testing ......................................................................................................................................................3

6.1 Number of tests ...................................................................................................................................................................................... 3

6.2 Repeatability and reproducibility ......................................................................................................................................... 3

6.3 Expression of mass, volume, factors and results ..................................................................................................... 3

6.4 Drying of materials ............................................................................................................................................................................. 3

6.5 Ignitions of precipitates ................................................................................................................................................................. 3

6.6 Check for the absence of chloride ions (silver nitrate test) ............................................................................. 4

7 Determination of acid soluble sulfates......................................................................................................................................... 4

7.1 Principle ....................................................................................................................................................................................................... 4

7.2 Preparation of test portion .......................................................................................................................................................... 4

7.3 Procedure .................................................................................................................................................................................................... 4

7.4 Calculation and expression of results ................................................................................................................................ 5

8 Test report .................................................................................................................................................................................................................. 5

Annex A (informative) Determination of acid soluble sulfates ............................................................................................... 6

iii
© ISO 2023 – All rights reserved
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ISO 24684-2:2023(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

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expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 71, Concrete, reinforced concrete and pre-

stressed concrete, Subcommittee SC 1, Test methods for concrete.
A list of all parts in the ISO 24684 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2023 – All rights reserved
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INTERNATIONAL STANDARD ISO 24684-2:2023(E)
Aggregates for concrete — Test methods for chemical
properties —
Part 2:
Determination of soluble sulfate salts
1 Scope

This document describes the procedure for the determination of soluble sulfate salts which can be

present in aggregates. The test is suitable for aggregates where the sulfate content derives directly

from contact with, or immersion in, saline water, e.g. typical sea-dredged aggregates.

2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
test portion
sample used as a whole in a single test
3.2
test specimen

sample used in a single determination when a test method requires more than one determination of a

property
3.3
laboratory sample
reduced sample derived from a bulk sample for laboratory testing
4 General

An aggregate test specimen is extracted with water to remove sulfate ions. The method of analyses of

the extract is based on the Volhard titration where an excess of silver nitrate solution is added to the

sulfate solution and the unreacted portion is back titrated with a standardized solution of thiocyanate,

using ammonium iron (III) sulfate solution as an indicator.

The sulfate are expressed in terms of, and reported as, the sulfate ion content as a percentage by mass

of aggregate.
© ISO 2023 – All rights reserved
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ISO 24684-2:2023(E)
5 Reagents
5.1 General
5.1.1 Unless otherwise stated, use onl
...

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