EN 1744-5:2006
(Main)Tests for chemical properties of aggregates - Part 5: Determination of acid soluble chloride salts
Tests for chemical properties of aggregates - Part 5: Determination of acid soluble chloride salts
This European Standard specifies the procedure for the determination of acid soluble chloride salts which may be present in aggregates. This test is suitable for aggregates where the chloride content does not derive directly from contact with, or immersion in, saline water. Examples of such aggregates are: recycled aggregates containing hydrated cement, where chloride may be bound as calcium chloroaluminates; and some aggregates from desert areas where chloride is occluded within the aggregate particles.
Prüfverfahren für chemische Eigenschaften von Gesteinkörnungen - Teil 5: Bestimmung der säurelöslichen Chloride
Diese Europäische Norm legt ein Verfahren zur Bestimmung säurelöslicher Chloride fest, die in Gesteins-körnungen
vorhanden sein können. Diese Prüfung ist für Gesteinskörnungen geeignet, deren Chloridgehalt
nicht unmittelbar aus dem Kontakt mit oder durch Eintauchen in Salzwasser abzuleiten ist. Beispiele für
Gesteinskörnungen dieser Art sind: rezyklierte Gesteinskörnungen mit abgebundenem Zement, in denen
Chloride als Calciumchloraluminate gebunden sein können sowie einige Gesteinskörnungen aus
Wüstengebieten, in denen Chloride in den Gesteinskörnern eingeschlossen sind.
Essais relatifs aux propriétés chimiques des granulats - Partie 5: Dosage des sels chlorures solubles dans l’acide
La présente Norme européenne spécifie un mode opératoire qui permet de doser les chlorures solubles dans l’acide, susceptibles d’être présents dans les granulats. Le présent essai convient pour des granulats dont la teneur en chlorures n’est pas directement due à un contact avec des eaux salines ou à une immersion dans ces dernières. A titre d’exemple, on peut citer les granulats recyclés contenant du ciment hydraté dans lesquels les chlorures peuvent être liés sous forme de chloro-aluminates de calcium ainsi que certains granulats situés dans les régions désertiques où les chlorures sont inclus dans les particules des granulats.
Preskusi kemičnih lastnosti agregatov – 5. del: Določevanje kloridnih soli, topnih v kislini
General Information
- Status
- Published
- Publication Date
- 03-Oct-2006
- Withdrawal Date
- 29-Apr-2007
- Technical Committee
- CEN/TC 154 - Aggregates
- Drafting Committee
- CEN/TC 154/SC 6 - Test methods
- Current Stage
- 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
- Start Date
- 02-Dec-2022
- Completion Date
- 02-Dec-2022
- Directive
- 89/106/EEC - Construction products
Overview
EN 1744-5:2006 (CEN) specifies the laboratory procedure for the determination of acid-soluble chloride salts in aggregates. The method is intended for aggregates whose chloride content does not originate from direct exposure to saline water - for example, recycled aggregates containing hydrated cement (chlorides bound as calcium chloroaluminates) and some desert aggregates where chloride is occluded inside particles. The standard describes sampling, reagents, apparatus, the Volhard titration principle and reporting requirements.
Key Topics
- Scope and applicability: Suitable for aggregates where chloride is acid-soluble and not directly derived from seawater contact.
- Principle: Powdered aggregate is extracted with boiling dilute nitric acid. Dissolved halides (expressed as chloride) are precipitated with a known volume of 0,100 mol/l silver nitrate (AgNO3). After boiling and filtration, the residual Ag+ is back-titrated with a standardized thiocyanate solution using ammonium iron(III) sulfate as an indicator (Volhard method).
- Reagents & concentrations: The standard references analytical-grade reagents and specifies key solutions: 0,100 mol/l AgNO3, approximately 0,1 mol/l thiocyanate, and a concentrated nitric acid preparation. General density ranges for concentrated acids are provided.
- Sampling & specimen preparation: Laboratory samples shall be representative of moisture and solids (see EN 932-1). A typical test specimen is approximately 2 g of finely powdered material (see EN 1744-1 for preparation).
- Critical notes: Aggregates with significant carbonates may froth on acid addition - add acid slowly while stirring. If the measured chloride exceeds about 0,85 %, a smaller test portion is required.
Applications
This test is used to:
- Evaluate chloride content in recycled concrete aggregates to assess potential corrosion risk when reused in concrete or other cementitious products.
- Assess aggregates from arid environments where occluded chlorides may affect durability.
- Support QA/QC during aggregate acceptance, reclamation, and reuse decisions.
Benefits:
- Provides a reproducible quantitative measure of acid-soluble chloride salts.
- Integrates with other EN 1744 parts and aggregate test standards for comprehensive chemical profiling.
Related Standards
- EN 1744-1:1998 - Preparation of test portions and chemical analysis guidance.
- EN 932-1 / EN 932-5 - Sampling methods and general apparatus requirements.
- EN 1744 series (Parts 1–6) for broader chemical property testing of aggregates.
Reporting requirements per EN 1744-5 include reference to the standard, sample source and designation, mass tested, test result (mean of two determinations to 0,01 %) and test date. Follow the standard text for full procedural and safety details.
Frequently Asked Questions
EN 1744-5:2006 is a standard published by the European Committee for Standardization (CEN). Its full title is "Tests for chemical properties of aggregates - Part 5: Determination of acid soluble chloride salts". This standard covers: This European Standard specifies the procedure for the determination of acid soluble chloride salts which may be present in aggregates. This test is suitable for aggregates where the chloride content does not derive directly from contact with, or immersion in, saline water. Examples of such aggregates are: recycled aggregates containing hydrated cement, where chloride may be bound as calcium chloroaluminates; and some aggregates from desert areas where chloride is occluded within the aggregate particles.
This European Standard specifies the procedure for the determination of acid soluble chloride salts which may be present in aggregates. This test is suitable for aggregates where the chloride content does not derive directly from contact with, or immersion in, saline water. Examples of such aggregates are: recycled aggregates containing hydrated cement, where chloride may be bound as calcium chloroaluminates; and some aggregates from desert areas where chloride is occluded within the aggregate particles.
EN 1744-5:2006 is classified under the following ICS (International Classification for Standards) categories: 91.100.15 - Mineral materials and products. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 1744-5:2006 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tests for chemical properties of aggregates - Part 5: Determination of acid soluble chloride saltsNLVOLQLEssais relatifs aux propriétés chimiques des granulats - Partie 5: Dosage des sels chlorures solubles dans l’acidePrüfverfahren für chemische Eigenschaften von Gesteinkörnungen - Teil 5: Bestimmung der säurelöslichen ChlorideTa slovenski standard je istoveten z:EN 1744-5:2006SIST EN 1744-5:2007en91.100.15Mineralni materiali in izdelkiMineral materials and productsICS:SLOVENSKI
STANDARDSIST EN 1744-5:200701-marec-2007
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1744-5October 2006ICS 91.100.15 English VersionTests for chemical properties of aggregates - Part 5:Determination of acid soluble chloride saltsEssais pour déterminer les propriétés chimiques desgranulats - Partie 5: Détermination de la teneur enchlorures solubles dans l'acidePrüfverfahren für chemische Eigenschaften vonGesteinkörnungen - Teil 5: Bestimmung der säurelöslichenChlorideThis European Standard was approved by CEN on 28 August 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2006 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1744-5:2006: E
EN 932
Tests for general properties of aggregates EN 933
Tests for geometrical properties of aggregates
EN 1097
Tests for mechanical and physical properties of aggregates
EN 1367
Tests for thermal and weathering properties of aggregates EN 13179
Tests for filler aggregate used in bituminous mixtures
The other parts of EN 1744 are, or will be:
Part 1: Chemical analysis
Part 2: Determination of resistance to alkali reaction Part 3: Preparation of eluates by leaching of aggregates Part 4: Determination of water susceptibility of fillers for bituminous mixtures
Part 6: Determination of the influence of recycled aggregate extract on the initial setting time of cement According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1744-1:1998, Tests for chemical properties of aggregates — Part 1: Chemical analysis EN 932-1, Tests for general properties of aggregates — Part 1: Methods for sampling EN 932-5, Tests for general properties of aggregates — Part 5: Common equipment and calibration ISO 384, Laboratory glassware — Principles of design and construction of volumetric glassware ISO 1042:1983, Laboratory glassware — One-mark volumetric flasks 3 Definitions For the purposes of this standard, the following terms and definitions apply. 3.1 test portion sample used as a whole in a
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