|
Report
ISO/TR 20659-2
First edition
Rheological test methods —
2024-03
Fundamentals and interlaboratory
comparisons —
Part 2:
Determination of the time-
dependent structural change
(thixotropy)
Méthodes d'essai rhéologiques — Principes fondamentaux et
comparaisons interlaboratoires —
Partie 2: Détermination de la variation structurelle dans le temps
(thixotropie)
Reference number
ISO/TR 20659-2:2024(en) © ISO 2024
---------------------- Page: 1 ----------------------
ISO/TR 20659-2:2024(en)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2024
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
© ISO 2024 – All rights reserved
ii
---------------------- Page: 2 ----------------------
ISO/TR 20659-2:2024(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Measuring technique for the determination of thixotropy . 1
4.1 Conditions for the measuring technique .1
4.2 Flow curves, with evaluation of the hysteresis area (rotational test) .3
4.2.1 Specification of the measuring profile .3
4.2.2 Evaluation .5
4.3 Step test with recovery, as a rotational test with controlled shear rate .7
4.3.1 Specification of the measuring programme .7
4.3.2 Evaluation .8
4.4 Step test with recovery, as a rotational test with alternating controlled shear stress
and shear rate .9
4.4.1 Specification of the measuring programme .9
4.4.2 Evaluation .10
4.5 Step test with recovery, as a combined oscillatory and rotational test with controlled
shear strain and shear rate, respectively .10
4.5.1 Specification of the measuring programme .10
4.5.2 Evaluation . .11
5 Comparative testing programme .
...