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Self-Desiccation of a Vernacular CSA Binder

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Abstract:

The fast precipitation of ettringite in conventional Calcium Sulfo Aluminate (CSA) cement causes rapid stiffening of the cement paste and is directly associated with short setting times and self-desiccation. To extend the time during which those types of cement remain workable, retarding admixtures can be used. However, retarders may affect the amounts and types of hydration products formed and as a consequence the ability of hydrated cement to chemically bind water. This work investigates the influence of two natural-based admixtures on the self-desiccation ability of a vernacular CSA ternary binder used as earth stabilization. Vicat measurements were used to study the efficiency of citric acid and sucrose as retarding admixtures on the setting time of stabilized earth. A quantitative study of the self-desiccation ability of the binder was performed on dried binder pastes using thermogravimetric analysis (TGA). Results show that both admixtures have a significant impact on the setting time of the binder. Furthermore, TGA showed that the self-desiccation ability of this vernacular CSA binder is significantly reduced when citric acid at high dosages is used, both at early hydration and after 14 days. On the contrary, the use of sucrose does not affect the water chemically bound at an early age but can maximize bound water after 14 days of hydration.

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Periodical:

Construction Technologies and Architecture (Volume 1)

Pages:

339-345

DOI:

https://doi.org/10.4028/www.scientific.net/CTA.1.339

Citation:

Cite this paper

Online since:

January 2022

Authors:

Natalia Pires Martins*, Burhan Cicek, Coralie Brumaud, Guillaume Habert

Keywords:

Alternative Binder, Citric Acid, Ettringite Binder, Retarding Admixtures, Stabilized Earth, Sucrose

Funder:

The publication of this article was funded by the ETH Zurich 10.13039/501100003006

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Creative Commons CC BY 4.0

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* - Corresponding Author

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