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External Sulphate Attack on Recycled Concrete: Assessment of the Influence of Recycled Aggregate

Santillan, L. R. / Villagrán Zaccardi, Y. A. / Zega, C. J.

Abstract The performance of recycled aggregate concrete (RAC) under external sulphate attack (ESA) has not been fully clarified yet. The attached mortar on recycled aggregate particles increases the content of hydration products from Portland cement that are able to react with external sulphates. In addition, it increases the porosity of the resulting material, facilitating the penetration of ions. In this paper, we present experimental results focusing on the evaluation of the potential reactivity of recycled aggregates themselves. Weight and length variations of mortar bars made with fine recycled aggregates obtained from crushing concretes containing high and low C3A Portland cements were determined after exposure to sulphate solution at 38 °C. In addition, concrete cores with 25 and 75 mm in diameter exposed to sulphate solution at 20 °C were also evaluated. The results show no indication of significant reactivity of recycled aggregates with external sulphate.

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External Sulphate Attack on Recycled Concrete: Assessment of the Influence of Recycled Aggregate

Santillan, L. R. / Villagrán Zaccardi, Y. A. / Zega, C. J.

Abstract The performance of recycled aggregate concrete (RAC) under external sulphate attack (ESA) has not been fully clarified yet. The attached mortar on recycled aggregate particles increases the content of hydration products from Portland cement that are able to react with external sulphates. In addition, it increases the porosity of the resulting material, facilitating the penetration of ions. In this paper, we present experimental results focusing on the evaluation of the potential reactivity of recycled aggregates themselves. Weight and length variations of mortar bars made with fine recycled aggregates obtained from crushing concretes containing high and low C3A Portland cements were determined after exposure to sulphate solution at 38 °C. In addition, concrete cores with 25 and 75 mm in diameter exposed to sulphate solution at 20 °C were also evaluated. The results show no indication of significant reactivity of recycled aggregates with external sulphate.

External Sulphate Attack on Recycled Concrete: Assessment of the Influence of Recycled Aggregate

Santillan, L. R. / Villagrán Zaccardi, Y. A. / Zega, C. J.

Abstract The performance of recycled aggregate concrete (RAC) under external sulphate attack (ESA) has not been fully clarified yet. The attached mortar on recycled aggregate particles increases the content of hydration products from Portland cement that are able to react with external sulphates. In addition, it increases the porosity of the resulting material, facilitating the penetration of ions. In this paper, we present experimental results focusing on the evaluation of the potential reactivity of recycled aggregates themselves. Weight and length variations of mortar bars made with fine recycled aggregates obtained from crushing concretes containing high and low C3A Portland cements were determined after exposure to sulphate solution at 38 °C. In addition, concrete cores with 25 and 75 mm in diameter exposed to sulphate solution at 20 °C were also evaluated. The results show no indication of significant reactivity of recycled aggregates with external sulphate.

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Title:

External Sulphate Attack on Recycled Concrete: Assessment of the Influence of Recycled Aggregate

Contributors:

Santillan, L. R. (author) / Villagrán Zaccardi, Y. A. (author) / Zega, C. J. (author)

Published in:

External Sulphate Attack – Field Aspects and Lab Tests ; 45-51

RILEM Bookseries ; 21

Publication date:

2019-09-18

Size:

7 pages

ISBN:

978-3-030-20331-3 , 978-3-030-20330-6

ISSN:

2211-0844 , 2211-0852

DOI:

https://doi.org/10.1007/978-3-030-20331-3_4

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Engineering , Building Materials , Structural Materials , Solid Mechanics

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