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Characterization of the self-healing effect through pore structure and durability of alkali-activated cement concrete

Author(s): Pavel Krivenko, Igor Rudenko, Oleh Petropavlovskiy, Oles' Lastivka
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
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: 401-406
Total Pages: 6
Language : English

Abstract: The paper considers the effect of constituents of alkali-activated cements (AAC) and the chemical admixtures on formation of effective porosity of concrete as a criterion for the AAC matrix to self-heal. The durability of concrete is performed by its frost resistance. Minimization of open capillary porosity was considered as the determining factor for reducing amount of ice in pores and predetermining a corresponding decrease in stresses. The influence of the anionic part of AAC’s alkaline component on the features of pore structure of concrete is shown. Thus, sodium carbonate causes greater open capillary porosity of compared to sodium silicates. An increase of granulated blast-furnace slag in AAC from 50 to 100 % and adequate increase alkaline component determine decrease in the volume of open capillary pores with higher volume of micro- and conditionally closed pores. This phenomenon determines increasing AAC concrete's ability to self-heal under the cyclic action of freezing and thawing. It was determined negative changes in the pore structure of AAC concretes modified with polyesters. It has been proposed to use alternative admixtures of the polyether type.

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

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