DEGRADATION OF HYDRATED CEMENTS BY CHLORIDE BRINES

  • OBERSTE-PADTBERG R
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Abstract

The interaction between alkali and alkaline earth saturated brines and hydrated high sulfate resistant cements, mixed with both/ fresh end 30% NaCl containing water, are presented. The reasons for the resulting cement degradation were studied by XRD, optical and scanning electron microscopy of the attacked cement samples as well as by chemical analysis of the different brines after reaction with the cement. KCl brine only attacked the fresh water cement at the direct cement-brine interface, whereas the salt water cement was hardly modified. Both MgCl2, and CaCl2 attack on fresh and salt water cements were severe. The degrading mechanism is explained by the formation of alkali hydroxides and silicates, and the related pH decrease that leads to C-S-H instability. Furthermore the. formation of chloroaluminates, gypsum, and an unrecognized Ca containing phase is presented

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Authors

  • R. OBERSTE-PADTBERG

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