CREEP PROPERTIES OF POLYMER PARTICLES IN POLYMER- MODIFIED CEMENT PASTES, QUANTIFIED BY MEANS OF MULTISCALE MODELING

Author(s): Luise Göbel (1,2), Markus Königsberger (2,3), Andrea Osburg (1), Bernhard Pichler (2)
Paper category: Proceedings
Book title: SynerCrete’18 International Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 659-664
Total Pages: 6
Language : English

Abstract: Polymer-modified mortars and concretes are more creep active than conventional cement- based materials. The present contribution studies the effects of the polymer particles at microscopic observation scales and quantifies their viscoelastic properties during cement hydration. To this end, two different polymer-modified cement pastes were characterized in the context of a comprehensive early-age creep testing campaign. Experimental results are
exploited by means of multiscale modeling, carried out using methods of continuum micromechanics. Scale-transition relations are used for downscaling macroscopic experimental results, referring to the material scale of cement pastes, to the microscopic creep behavior of the cementitious hydrates and the polymer particles. In order to study the creep-magnifying effect of the polymers, three different modeling approaches are investigated. The microscopic polymer particles are considered as (i) pores, exhibiting vanishing elastic stiffness, (ii) an elastic phase without creep activity, or (iii) a viscoelastic material phase. The modeled creep curves obtained from the latter approach agree well with the experimental results. This corroborates that polymers act as viscoelastic phases in the cement microstructure and, thus, magnify the macroscopic creep behavior of polymer-modified cement-based materials.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00