Bitumen and bituminous binders – Determination of acid number of bitumen – Potentiometric method

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Språk: engelska/English Utgåva: 1

Bitumen and bituminous binders – Determination of acid number of bitumen – Potentiometric method

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Denna tekniska specifikation är inte en svensk standard. Detta dokument innehåller den engelska språkversionen av CEN/TS 17482:2020.

This Technical Specification is not a Swedish Standard. This document contains the English language version of CEN/TS 17482:2020.

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English Version

Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method

Bitumes et liants bitumineux - Détermination de l'indice d'acide d'un bitume - Méthode

potentiométrique

Bitumen und bitumenhaltige Bindemittel - Bestimmung der Säurezahl von Bitumen -

Potentiometrisches Verfahren

This Technical Specification (CEN/TS) was approved by CEN on 1 June 2020 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E UR O P É E N DE N O R M A L I SA T I O N E UR O P Ä I SC H E S KO M I T E E F ÜR N O R M UN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

worldwide for CEN national Members. Ref. No. CEN/TS 17482:2020 E

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According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

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1 Scope

This document describes a method for the determination of the free acidic constituents present in bitumen, conventionally known as acid number.

WARNING — The use of this document may involve hazardous materials, operations and equipment. This document does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.

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 58, Bitumen and bituminous binders — Sampling bituminous binders EN 12594, Bitumen and bituminous binders — Preparation of test samples

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

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 https://www.iso.org/obp 3.1 acid number

number of milligrams of potassium hydroxide necessary for the neutralization of the free acids contained in one gram of bitumen

3.2 equivalence point

stage of the titration procedure at which the added volume (equivalent volume) of titration reagent has allowed to neutralize the acid compounds of the test sample

Note 1 to entry: In potentiometric titrations, this point corresponds to the inflexion point of the potential curve.

4 Principle

The bitumen is dissolved in a solvent-alcohol mixture. The acidic constituents are titrated using a solution of alcoholic potassium hydroxide. The titration is monitored by potentiometry.

5 Products and reagents

5.1 General

Only use reagents of a quality recognized for analysis.

5.2 Potassium hydroxide RP (analytical grade), in pellets.

5.3 Propan-2-ol (isopropanol) RP (analytical grade).

SIS-CEN/TS 17482:2020 (E)

Bitumen and bituminous binders – Determination of acid number of bitumen – Potentiometric method

Bitumen and bituminous binders – Determination of acid number of bitumen – Potentiometric method

Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method

Contents

1 Scope

2 Normative references

3 Terms and definitions

4 Principle

5 Products and reagents