Abstract
Potential degradation of concrete structures made of calcium aluminate cement (CAC) is well known and is caused by transformation (conversion) of the thermodynamically metastable into stable calcium aluminate hydrate phases. This recrystallization is influenced by temperature and humidity; the structural degradation of the concrete itself thus its loss of strength, is strongly related to the pore structure of the hydrated cement paste, the critical parameters being the total volume of pores below 15-20 nm and the median micropore radius. This constitutes a novel procedure for evaluation of existing CAC concrete structure.
Highlights
The presented results are based on a comprehensive review of actual structures built years ago in Czechoslovakia (¡920-1957) using calcium aluminate cement (CAC) (I)
A/though use of CAC was outlawed in ¡957, numerous structures with cemento aluminoso (CA) C concrete are still in use
Water-to-cement ratio, the density of the matrix, was the first condition found to be related to the kinetics of the CAHj^ + C/ifJg to C/iH^ + AH^ conversion
Summary
The presented results are based on a comprehensive review of actual structures built years ago in Czechoslovakia (¡920-1957) using calcium aluminate cement (CAC) (I). A/though use of CAC was outlawed in ¡957, numerous structures with CA C concrete are still in use. Aun cuando a través de los valores obtenidos en las medidas de resistencias se desprendía una buena impresión en cuanto a la aparente calidad de las estructuras analizadas, en el estudio no se indicaba el grado de conversión del CA, por lo cual, la vida residual de las estructuras no podía ser estimada con seguridad. Algunas edificaciones realizadas con C A no están catalogadas como tales, por lo cual continuamente están apareciendo nuevos casos de daños estructurales
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