National foreword

This Published Document is the UK implementation of CEN/TS 12697‑57:2026.

The UK participation in its preparation was entrusted to Technical Committee B/510/1, Asphalt products.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

This publication is not to be regarded as a British Standard.

Compliance with a Published Document cannot confer immunity from legal obligations.

This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 October 2026.

This Technical Specification (CEN/TS) was approved by CEN on 3 August 2026 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, Czechia, 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, Türkiye and United Kingdom.

European foreword

This document (CEN/TS 12697‑57:2026) has been prepared by Technical Committee CEN/TC 227 Road Materials, the secretariat of which is held by BSI.

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.

Any feedback and questions on this document should be directed to the users’ national standards body. A complete listing of these bodies can be found on the CEN website.

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, Türkiye and the United Kingdom.

Introduction

This document is based on the measurement method for the workability of mastic asphalt described in the annex of the German national regulation Merkblatt für Temperaturabsenkung von Asphalt (Guideline for temperature reduction of asphalt) [1]. The measurement method described there has been adapted and extended to develop a European standard. Important additions compared to the German national regulation refer to the following topics:

enabling workability measurements on mastic asphalts produced at various temperatures;
adaptation of the initial phase of the workability test to increase the test precision;
requirements for the treatment of the measurement data and the expression of the results have been developed;
a first estimation of the repeatability of the workability test has been indicated;
introduction of a sampling rate for data acquisition.

1 Scope

This document specifies a test method for determining the workability of mastic asphalt by torque measurements as a function of the temperature. This document applies to mastic asphalt produced in the laboratory with a maximum nominal size of the aggregates less than or equal to 11 mm.

2 Normative references

3 Terms and definitions

4 Principle

5 Equipment

5.1 Stirring device

5.2 Torque sensor

5.3 Stirring bowl

5.4 Stirrer

5.5 Temperature measurement device

5.6 Heating mantle

5.7 Data registration equipment

5.8 Sampling rate

6 Test specimen preparation

7 Test procedure

8 Calculation and expression of results

8.1 Treatment of the raw measurement data

8.2 Indication of the smoothed workability curves

8.3 Calculation of the mean value of the torque for predefined grid temperatures

8.4 Calculation of the global result

9 Precision

10 Test report

Bibliography