Internal Sulphate Attack in Masonry Mortars with Thaumasite Formation

Author:

Chinchón-Payá ServandoORCID,Aguado de Cea AntonioORCID,Saval Pérez José Miguel,Chinchón Yepes José Servando

Abstract

The present paper focuses on the study of mortar samples where expansions with thaumasite formation occur as a consequence of sulphate attack. The samples correspond to a masonry mortar used in a rural construction located in the Spanish province of Toledo made of cement with limestone filler addition CEM II/AL. Composition and microstructure of the mortars have been analysed by means of scanning electron microscopy (SEM) using secondary and backscattered electrons (BSE) and X-ray diffraction (XRD). The results show that aggregates are contaminated with gypsum, which is the source of the sulphates for the internal attack. It seems that thaumasite is formed through an ettringite transformation where aluminium atoms are replaced with silicon atoms by means of a solid solution. The study highlights that thaumasite can be formed in warm weather through an internal sulphate attack due to gypsum contamination of aggregates.

Publisher

MDPI AG

Subject

General Materials Science

Reference40 articles.

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2. The Thaumasite Form of Sulfate Attack: Risks, Diagnosis, Remedial Works and Guidance on New Construction,1999

3. Procedure of synthesis of thaumasite

4. Synthetic Preparation of Thaumasite – Several Possible Routes for Thaumasite Formation

5. Ettringite dependace in thaumasite formation

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