Thaumasite formation in hydraulic mortars by atmospheric SO<sub>2</sub> deposition

M. T. Blanco-Varela; J. Aguilera; S. Martínez Ramirez; A. Palomo; C. Sabbioni; C. Riontino; G. Zappia; K. Van Valen; E. E. Toumbakari

doi:10.3989/mc.2001.v51.i263-264.357

Thaumasite formation in hydraulic mortars by atmospheric SO₂ deposition

Authors

M. T. Blanco-Varela Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)
J. Aguilera Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)
S. Martínez Ramirez Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)
A. Palomo Instituto de Ciencias de la Construcción Eduardo Torroja (CSIC)
C. Sabbioni Institute ISAO, National Research Council
C. Riontino Institute ISAO, National Research Council
G. Zappia Institute ISAO, National Research Council
K. Van Valen Dept. of Civil Engineering, KU Leuven
E. E. Toumbakari Dept. of Civil Engineering, KU Leuven

DOI:

https://doi.org/10.3989/mc.2001.v51.i263-264.357

Abstract

Sulphation of mortars and concretes is a function of diverse environmental factors (SO₂ aerosol, temperature, etc) as well as some material characteristics. One of the phases that could be formed as consequence of the sulphation of the hydraulic binder is thaumasite. In this paper different hydraulic mortars have been exposed to laboratory exposure chambers in order to reproduce thaumasite formation due to atmospheric SO₂. Under the laboratory exposure conditions, thaumasite was formed in hydraulic lime mortars, and mortars elaborated with ordinary Portland cement as well as mineralized white portland cement. However, thaumasite was not formed in mortars made of lime and pozzolan. The first product formed as a result of the SO₂-mortar interaction was gypsum. Gypsum reacted with calcite and C-S-H gel, present in the samples, giving place to thaumasite. Low temperature promotes thaumasite formation.

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Published

2001-12-30

How to Cite

Blanco-Varela, M. T., Aguilera, J., Martínez Ramirez, S., Palomo, A., Sabbioni, C., Riontino, C., Zappia, G., Van Valen, K., & Toumbakari, E. E. (2001). Thaumasite formation in hydraulic mortars by atmospheric SO2 deposition. Materiales De Construcción, 51(263-264), 109–125. https://doi.org/10.3989/mc.2001.v51.i263-264.357

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Issue

Vol. 51 No. 263-264 (2001)

Section

Research Articles

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