Abstract
The interaction between cement paste and sulfate-rich solutions or soils induces gypsum, ettringite or thaumasite precipitation. These expansive processes may be mitigated by using BaCO3 (witherite) as a setting regulator. The present study explored ettringite decomposition in the presence of witherite at different temperatures (25, 40 and 65°C) and reaction times (up to 90days) to further the understanding of this process as grounds for developing new sulfate-resistant cements (SR-PC).According to the XRD, FTIR and DSC-TG findings, sulfoaluminate decomposition and barite formation begin in the first 24h of the reaction, even at ambient temperature (25°C), and progress rapidly for the first 30days. The reaction follows a different pathway at 65°C than at 25 and 40°C due to ettringite instability at high temperatures.
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