CEN/TS 17482:2020
(Main)Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method
Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method
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.
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Säurezahl von Bitumen - Potentiometrisches Verfahren
Dieses Dokument beschreibt ein Verfahren zur Bestimmung der in Bitumen enthaltenen freien sauren Bestandteile, gemeinhin als Säurezahl bekannt.
WARNUNG - Die Anwendung dieses Dokuments kann gefährliche Substanzen, Arbeitsgänge und Ausrüstung einschließen. Dieses Dokument erhebt nicht den Anspruch, auf alle Sicherheitsprobleme hinzuweisen, die mit seiner Anwendung verbunden sind. Es liegt in der Verantwortung des Anwenders dieses Dokuments, geeignete Sicherheits und Gesundheitsschutzmaßnahmen vorzusehen und im Vorfeld die Anwendbarkeit von einschränkenden Vorschriften zu klären.
Bitumes et liants bitumineux - Détermination de l'indice d'acide d’un bitume - Méthode potentiométrique
Le présent document spécifie une méthode de détermination des constituants acides libres présents dans un bitume, conventionnellement désignés sous le terme « indice d’acide ».
AVERTISSEMENT - L'utilisation de ce document implique l'intervention de produits, d'opérations et d'équipements à caractère dangereux. Le présent document n'est pas censé aborder tous les problèmes de sécurité concernés par son usage. Il est de la responsabilité de l'utilisateur de ce document de consulter et d'établir des règles de sécurité et d'hygiène appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation.
Bitumen in bitumenska veziva - Določevanje kislinskega števila bitumna - Potenciometrijska metoda
General Information
Overview
CEN/TS 17482:2020 - Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method - specifies a laboratory potentiometric titration procedure to measure the acid number (mg KOH/g) of bitumen and bituminous binders. The method quantifies the free acidic constituents by dissolving bitumen in a solvent/alcohol mixture and titrating with an alcoholic potassium hydroxide solution while monitoring the potential change (potentiometry).
Safety note: the procedure involves hazardous chemicals and equipment. Users must follow appropriate health, safety and regulatory requirements.
Key topics and technical requirements
- Principle: Dissolve bitumen in a 1:1 mix of solvent (xylene or toluene) and isopropanol (propan-2-ol) and titrate with 0.1 mol/L alcoholic KOH; determine equivalence point by the inflection of the potential curve.
- Reagents: Analytical-grade potassium hydroxide (KOH), propan-2-ol, solvent (xylene or toluene), benzoic acid (for standardization). A 0.1 mol/L alcoholic KOH solution can be prepared (≈6.0 ± 0.2 g KOH per 1 L propan-2-ol) or used as a certified ready-to-use solution.
- Apparatus: Automatic or manual potentiometric titration system with sensitivity ≥2 mV, Ag/AgCl reference and non-aqueous pH glass electrode (or combined electrode), magnetic stirrer, precision balance (±1 mg).
- Sampling & sample prep: Follow EN 58 for sampling and EN 12594 for preparation. Typical test uses ~5 g bitumen dissolved in 50 mL solvent + 50 mL propan-2-ol (ratios adjustable while maintaining 1:1 solvent/alcohol and minimum bitumen-to-solvent ratio).
- Standardization & blanks: Standardize alcoholic KOH by titrating benzoic acid and perform a daily blank on the solvent/alcohol mix. Titrations should be continued until potential slope stabilizes; multiple equivalence points may occur and must be reported.
- Results & precision: Calculation and reporting procedures are specified; users should follow the document for expression of results, repeatability and reproducibility requirements.
Applications and who uses it
- Quality control and laboratory testing in bitumen production and paving material supply chains.
- Asphalt technologists, bitumen suppliers, materials testing laboratories, road authorities and research institutes who need reliable measurement of acidic constituents that can affect binder performance, adhesion and compatibility with additives.
Related standards
- EN 58 - Sampling of bituminous binders
- EN 12594 - Preparation of test samples for bituminous binders
Keywords: CEN/TS 17482:2020, acid number, bitumen, potentiometric method, alcoholic potassium hydroxide, potentiometry, bituminous binders, titration, Ag/AgCl electrode.
Frequently Asked Questions
CEN/TS 17482:2020 is a technical specification published by the European Committee for Standardization (CEN). Its full title is "Bitumen and bituminous binders - Determination of acid number of bitumen - Potentiometric method". This standard covers: 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.
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.
CEN/TS 17482:2020 is classified under the following ICS (International Classification for Standards) categories: 75.140 - Waxes, bituminous materials and other petroleum products; 91.100.50 - Binders. Sealing materials. The ICS classification helps identify the subject area and facilitates finding related standards.
You can purchase CEN/TS 17482:2020 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2020
Bitumen in bitumenska veziva - Določevanje kislinskega števila bitumna -
Potenciometrijska metoda
Bitumen and bituminous binders - Determination of acid number of bitumen -
Potentiometric method
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Säurezahl von Bitumen -
Potentiometrisches Verfahren
Bitumes et liants bitumineux - Détermination de l'indice d'acide d’un bitume - Méthode
potentiométrique
Ta slovenski standard je istoveten z: CEN/TS 17482:2020
ICS:
75.140 Voski, bitumni in drugi naftni Waxes, bituminous materials
proizvodi and other petroleum products
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN/TS 17482
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
July 2020
TECHNISCHE SPEZIFIKATION
ICS 75.140; 91.100.50
English Version
Bitumen and bituminous binders - Determination of acid
number of bitumen - Potentiometric method
Bitumes et liants bitumineux - Détermination de Bitumen und bitumenhaltige Bindemittel -
l'indice d'acide d'un bitume - Méthode Bestimmung der Säurezahl von Bitumen -
potentiométrique 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
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17482:2020 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Products and reagents . 4
6 Apparatus . 5
7 Sampling . 5
8 General instructions. 6
8.1 Preparation of the potentiometry apparatus and electrodes . 6
8.2 Titration of the solution of alcoholic potassium hydroxide and blank test . 6
8.3 Operating procedure . 6
9 Operating procedure . 6
9.1 Titration of the solution of alcoholic potassium hydroxide and blank test . 6
9.2 Titration of the bitumen . 7
10 Calculations . 8
11 Expression of results . 8
12 Precision . 9
12.1 Repeatability . 9
12.2 Reproducibility . 9
13 Test report . 9
Annex A (informative) Method for using a manual titration apparatus . 10
A.1 General . 10
A.2 Operating procedure . 10
Bibliography . 13
European foreword
This document (CEN/TS 17482:2020) has been prepared by Technical Committee CEN/TC 336
“Bituminous binders”, the secretariat of which is held by AFNOR.
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.
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.
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).
5.4 Solvent RP (analytical grade), xylene or methyl benzene (toluene).
5.5 Benzoic acid RP (analytical grade).
5.6 Solution of alcoholic potassium hydroxide, 0,1 mol/L.
Dissolve (6,0 ± 0,2) g of potassium hydroxide pellets (5.2) in 1 L of pure propan-2-ol (5.3).
A ready-for-use, off-the-shelf solution can also be used. Only a titration certificate coming from an
authorized supplier can avoid the titration procedure (9.1). The alcoholic potassium hydroxide solution
shall be kept in brown glass containers and stored in the dark.
6 Apparatus
6.1 General
Usual laboratory equipment, together with the following.
6.2 Balance of adequate capacity for weight with precision of ± 1 mg.
6.3 Potentiometry apparatus, for automatic or manual titration:
— apparatus for automatic titration, including a titration device with sensitivity of at least 2 mV,
equipped with an automatic dosage unit with a capacity of 5 mL to 20 mL. Most of these pieces of
equipment offer a program for potentiometric detection with dynamic equivalence point titration. It
means that increment is slowed down near the equivalence point;
— apparatus for manual titration, including a potentiometer with a sensitivity of at least 2 mV and a
burette with a pointed spout.
The equipment shall allow titration steps to be performed at an accuracy of at least ± 0,05 mL in volume.
6.4 Glass combination electrode – Ag/AgCl.
6.4.1 A pH glass electrode for non-aqueous media and a reference electrode of Ag/AgCl (kept in its
inner reference electrolyte).
6.4.2 Combined pH electrode for non-aqueous media instead of the two electrodes cell of 6.4.1.
6.5 Glass beakers, or any glass titration container, specific for the automatic potentiometric titration
device (6.3).
The volume of beakers shall be appropriate for immersing the membrane of electrodes into the tested
solution and shall allow increasing this volume during titration.
The level of solution in the beaker shall be below the filling hole of the electrodes but has to be high
enough to prevent the stirring bar (if it is necessary to use it) from hitting the membranes if the electrodes
have to be close to the bottom of the beaker.
6.6 Magnetic stirrer, with polytetrafluoroethylene (PTFE)-coated bar.
7 Sampling
Take the sample in accordance with EN 58. Prepare the test samples in accordance with EN 12594.
8 General instructions
8.1 Preparation of the potentiometry apparatus and electrodes
The titration device shall be prepared following manufacturer instructions.
Special attention shall be paid to the storing and maintenance of the electrodes:
— before using, the inner body shall be filled with the electrolyte. If necessary, refill and let the electrode
to rest for at least o
...
기사 제목: CEN/TS 17482:2020 - 비투맨과 비투마 결합제 - 비투맨의 산성 지수 결정 - 전위차 측정법 기사 내용: 이 문서는 전통적으로 산성 지수로 알려진 비투맨 내에 존재하는 자유로운 산성 성분을 결정하기 위한 방법을 설명한다. 경고 - 이 문서의 사용은 위험한 물질, 운영 및 장비와 관련될 수 있다. 이 문서는 사용에 관련된 모든 안전 문제를 다루지는 않는다. 이 문서의 사용자는 적절한 안전 및 건강 관행을 수립하고 사용 전 규제 제한의 적용 가능성을 결정하는 것이 책임이다.
CEN/TS 17482:2020 is a document that outlines a potentiometric method for determining the acid number of bitumen. The acid number refers to the free acidic components in bitumen. The document includes a warning about the potential hazards involved in using this method, as it may involve hazardous materials, operations, and equipment. The user of this document is responsible for establishing safety and health practices and understanding regulatory limitations before using it.
記事のタイトル：CEN/TS 17482:2020 - ビチューメンとビチューメン結合剤 - ビチューメンの酸価の決定 - 電位計による方法 記事内容：この文書は、一般に酸価として知られるビチューメン中の遊離酸性成分を決定するための方法を説明しています。 警告 - この文書の使用には、危険物、操作、および装置が関わる場合があります。この文書は、使用に関連するすべての安全上の問題について取り扱っているわけではありません。この文書の使用者は、適切な安全および健康上の規則を確立し、使用前に規制上の制限の適用可能性を判断する責任を負います。
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