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Effects of biaxial confinement in mortars exposed to external sulfate attack

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journal contribution
posted on 2019-01-30, 15:09 authored by Tai Ikumi, Ignacio Segura, Sergio Pialarissi-CavalaroSergio Pialarissi-Cavalaro
Research on external sulfate attack (ESA) is usually performed on small scale specimens under free expanding conditions. However, most field structures cannot expand freely due to confinement induced by the ground or other elements from the structure. As a result, ESA usually develops in confined conditions. This work aims to assess the interaction of gradual biaxial compression stresses generated by confinement with the ESA. Visual appearance, mass and ultrasonic velocity were monitored to characterize the macro-scale behavior of free and restrained mortar samples. Changes on phase composition and crystal morphology induced by confinement were evaluated by X-Ray diffraction and scanning electron microscopy. The confining stresses generated were estimated during the attack. Results indicate that ESA is not developed equally in free and confined specimens. The confinement limits sulfate availability, reduce the amount of ettringite precipitated and might induce changes on crystal morphology that reduce the degradation caused by the ESA.

Funding

Support from the Spanish Ministry of Economy and Competitiveness through research project BIA2013-49106-C2-1-R is greatly acknowledged. T. Ikumi is supported by the fellowship program FPI BES-2014-068524 of the Spanish Ministry of Economy and Competitiveness.

History

School

  • Architecture, Building and Civil Engineering

Published in

Cement and Concrete Composites

Volume

95

Pages

111 - 127

Citation

IKUMI, T., SEGURA, I. and CAVALARO, S.H., 2018. Effects of biaxial confinement in mortars exposed to external sulfate attack. Cement and Concrete Composites, 95, pp.111-127.

Publisher

© Elsevier

Version

  • AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Cement and Concrete Composites and the definitive published version is available at https://doi.org/10.1016/j.cemconcomp.2018.10.017

Acceptance date

2018-10-25

Publication date

2018-10-28

Copyright date

2019

ISSN

0958-9465

Language

  • en

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