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Volume stability of alkali activated Portland cement concretes with alkali- susceptible aggregates

Author(s):Pavel Krivenko
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 18-27
Total Pages: 9
Language : English

Abstract: The paper presents the results of study on the influence of metakaolin additive on volume
stability and strength characteristics of alkali activated portland cement concrete with alkali-
susceptible aggregates with basalt as example. The structure- forming processes in an
interfacial transition zone of the concrete "alkali activated portland cement – cast basalt bar"
have been studied. The results of study allowed to reveal a positive effect arising from
corrosion of the alkali- susceptible basalt bar in case of modification of the alkali- activated
portland cement by a metakaolin additive. These conclusions are supported by data on
interaction of structure forming processes in the interfacial transition zone and physico-
mechanical characteristics of the concrete made with the alkali- susceptible aggregate (cast
bar from basalt rock). A mechanism of AAR in case of alkali- susceptible aggregates in
alkali- activated portland cement concretes modified by active Al2O3 – containing additive
(metakaolin) has been described and discussed in details.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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