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External sulphate attack of sprayed mortars with sulphate-resisting cement: Influence of accelerator and age of exposition

journal contribution
posted on 20.10.2020, 10:40 by C Herrera-Mesen, RP Salvador, T Ikumi, Sergio Cavalaro, A Aguado
© 2020 Elsevier Ltd This work evaluates the influence of the accelerator type, the cement type and age of exposure on the degradation mechanism and the durability of sprayed mortars subjected to external sulphate attack (ESA). Cores and prisms were extracted from panels sprayed with 8 mortar compositions (with 2 sulphate-resisting cement types and 4 setting accelerators) and then exposed to a sulphate solution at the ages of 7 or 28 days for 400 days. The evolution of the ESA was assessed through XRD, SEM, compressive strength, dimensional variation and ultrasonic pulse velocity. Results show that alkaline accelerators increase drastically the vulnerability of the matrix to the ESA. The degradation is enhanced by the higher solubility of aluminate phases and the increased formation of expansive phases. Results reveal that the use of sulphate-resisting cement might not suffice to mitigate severe material degradation.

Funding

projects BIA2016-78740-R (MAPPU) and RTC-2015-3185-4 (MAPMIT)

History

School

  • Architecture, Building and Civil Engineering

Published in

Cement and Concrete Composites

Volume

114

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

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.2020.103614

Acceptance date

30/03/2020

Publication date

2020-08-15

Copyright date

2020

ISSN

0958-9465

Language

en

Depositor

Prof Sergio Cavalaro. Deposit date: 16 October 2020

Article number

103614

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