ISO INTERNATIONAL STANDARD 23523 First edition 2021-03 Test methods for discrete polymer fibre for fibre-reinforced cementitious composites Methodes d'essai des fibres polymeres distinctes pour les composites a base de ciment renforces par des fibres Reference number IS0 23523:2021(E) Tso @IS0 2021 IS0 23523:2021(E) COPYRIGHTPROTECTEDDOCUMENT @IS02021 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: copyright@iso.org Website: www.iso.org Published in Switzerland ii @IS0 2021 - All rights reserved IS023523:2021(E) Contents Page Foreword iv Introduction. .V 1 Scope. 2 Normativereferences 1 3 Terms and definitions. 4 Symbols and abbreviated terms .2 5 Test methods for determining fibre diameter 3 5.1 Consecutivefibremethod. 3 5.2 Chopped fibre method. 3 5.3 Test report. 4 6 Test method for determining fibre length 4 6.1 Procedure. 4 6.2 Test report. 4 7 Test method for determining tensile strength and initial modulus of elasticity 5 7.1 Testing machine. 5 7.2 Sampling of specimens. 5 7.3 Procedure. 5 7.4 Tensile strength 6 7.5 Initial modulus of elasticity 6 7.6 Test report. 7 8 Test method for determining fibre density .7 8.1 Procedure 7 8.2 Test report. 7 9 Testmethodfordeterminingthermal propertiesoffibre .8 9.1 Melting point. 8 9.2 Test report. .8 10 Testmethod fordetermining moisturecontentoffibre .8 10.1 Procedure 8 10.2 Test report. 9 11 Test method for determining alkaline durability .9 11.1 General 9 11.2 Apparatus and reagents. 9 11.3 Sampling and conditioning of test specimens. 10 11.4 Preparation ofalkaline solution. 10 11.5 Exposure of alkaline condition 10 11.6 Tensile test procedure .11 11.7 Calculations. 11 11.8 Test report. .11 Bibliography .13 @IS0 2021-All rights reserved iii