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Multifunctional use of SAP in strain-hardening cement-based composites

Title: Multifunctional use of SAP in strain-hardening cement-based composites
Author(s): A-E. Brüdern, V. Mechtcherine
Paper category : conference
Book title: International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
Editor(s): O.M. Jensen, M.T. Hasholt and S. Laustsen
Print-ISBN: 978-2-35158-104-9
e-ISBN: 978-2-35158-105-6
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 11 - 22
Total Pages: 12
Nb references: 16
Language: English

Abstract: This article describes the multipurpose use of superabsorbent polymers (SAP) in strain hardening cement-based composites (SHCC) under the aspects of their mechanical and shrinkage behaviour as well as their frost resistance. Unlike ordinary, strain-softening concrete materials, SHCC exhibits a pronounced degree of multiple cracking when subjected to tensile loading, resulting in a ductile response with a strain capacity of up to 5 %. The addition of fine SAP particles to the SHCC mix results in the formation of a great number of well distributed voids initially filled with water. The results of quasi-static, uniaxial tension tests on hardened SHCC demonstrate that such a system of voids facilitates multiple cracking by fostering the formation of additional micro-cracks. Furthermore, the positive influence of voids on the frost resistance of SHCC, as induced by adding SAP, is demonstrated. Finally, the potential of using SAP as tiny water reservoirs for the purpose of internal curing is investigated by measuring autogenous and total shrinkage of SHCC.

Online publication: 2010-10-04
Publication type : full_text
Public price (Euros): 0.00

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