Internal Sulphate Attack in Masonry Mortars with Thaumasite Formation

被引：3

作者：

Chinchon-Paya, Servando ^{[1
]}

Aguado de Cea, Antonio ^{[2
]}

Saval Perez, Jose Miguel ^{[3
]}

Chinchon Yepes, Jose Servando ^{[4
]}

机构：

[1] Eduardo Torroja Inst Construct Sci IETcc CSIC, Calle Serrano Galvache 4, Madrid 28033, Spain

[2] Barcelona Sch Civil Engn ETSECCPB UPC, Dept Environm & Civil Engn, Jordi Girona 1-3, Barcelona 08034, Spain

[3] Univ Alicante, Dept Civil Engn, Polytech Sch, Carretera San Vicente del Raspeig S-N, Alicante 03690, Spain

[4] Univ Alicante, Univ Inst Water & Environm Sci, Carretera San Vicente del Raspeig S-N, Alicante 03690, Spain

来源：

MATERIALS | 2022年 / 15卷 / 16期

关键词：

thaumasite; mortar; ettringite; solid solution; internal sulphate attack; SOUTHERN CALIFORNIA; SOLID-SOLUTIONS; IRON SULFIDES; CONCRETE; FORM; DETERIORATION;

D O I：

10.3390/ma15165708

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：10

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