DIN EN 12846-1:2011-05

This document (EN 12846-1:2011) has been prepared by Technical Committee CEN/TC 336 "Bituminous binders", the secretariat of which is held by AFNOR (France).
The responsible German committee is Joint Committee NA 062-03-32 GA "Bitumen; Prüfverfahren und Anforderungen für die Bindemittel" ("Bitumen; test methods and specifications of binders") of the Materials Testing Standards Committee (NMP) and of the Building and Civil Engineering Standards Committee (NABau) at DIN.
The following modifications have been made with respect to DIN EN 12846:2002-08:
a) number of the standard has changed;
b) procedure has been described in more detail;
c) standard has been editorially revised.
EN 12846-1 has been created as the result of the merging of EN 12846:2002 and EN 13357:2002 under a single reference, namely EN 12846 (two different parts), since both standards describe very similar procedures with identical equipment. The two different parts have been made as consistent as possible by eliminating all existing minor differences between both methods.
This European Standard specifies a method for the determination of the efflux time at 40 °C of bituminous emulsions in seconds using an efflux viscometer. Alternative test temperature is 50 °C.
The procedure described in this standard may also be followed to determine efflux time at other temperatures, such as for instance 25 °C.
The efflux time of a bituminous emulsion is determined using an efflux viscometer known as the Standard Tar Viscometer (STV) which determines the time of efflux of a 50 ml sample through a 10 mm or a 4 mm or a 2 mm orifice at a specified temperature.
Whatever temperatures or orifice diameters used, the efflux time shall not exceed 600 s. For highly viscous emulsions, EN 13302 shall be used.