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STRAIN HARDENING CHARACTERISTICS OF BLENDED ALKALI ACTIVATED BINDERS CURED AT AMBIENT TEMPERATURES
Author(s): M. Talha Junaid (1), Mohamed Maalej (1)
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: 999-1004
Total Pages: 6
Language : English
Abstract: Micro fibers are extensively used to reduce the brittle response of concrete and alkali activated matrix in tension and flexure. Such composites, if designed correctly, can offer stain hardening characteristics both in flexure and axial tension, which are characterized by large deformations, multiple cracking and high energy absorption during loading. This study looks at characterizing the strain hardening properties of ambient cured alkali activated binders during direct tension and flexural tests at 7 and 28 days. Three-point bending test was performed for flexural evaluation while direct tension test with dog-bone samples were performed to evaluate the axial tensile behavior. A combination of sodium silicate and sodium hydroxide is used to activate a blend of Fly ash and slag to form binders. A high aspect ratio polyethylene (PE) fiber was used in this study. Strength and ductility properties of all samples improved with age of the matrix. The results indicate that the introduction of fibers induced strain hardening response in all samples during flexure and direct tension tests. The load deflection response was significantly improved with high deformations and multiple cracking observed in all tested samples. A significant increase in the flexural toughness for all samples was also witnessed. The results indicate that highly ductile strain hardening alkali activated composites can be obtained at ambient temperatures without the need for heat curing, with properties comparable to both OPC based and heat cured alkali activated composites.
Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00
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