Hydration of C3S in anhydrite and hydratable alumina mixtures: Insights into experimental and thermodynamic phase development
Source abstract
Abstract
The hydration of C 3 S with anhydrite and hydratable alumina was studied with heat flow calorimetry, XRD, and pore solution analysis. Two mixtures that would form predominantly monosulfate or ettringite along with straetlingite as predicted by thermodynamic modeling were selected. Additionally, an Al-rich mixture was chosen to show the effect of an aluminum surplus on C 3 S reaction. The hydration of these mixtures was analyzed and compared with the predicted phase assemblages from thermodynamic modeling. The results revealed the rapid formation of high amounts of ettringite in all systems. Throughout the hydration, the high ettringite supersaturation in close proximity to its solubility curves resulted in pore solution compositions kinetically favoring ettringite precipitation within the first 24 h. Resultant ion concentrations inhibited the formation of monosulfate due to its undersaturation. Simultaneously, an amorphous C-A-S-H phase, thermodynamically similar to zeolite_P(Ca), is expected to form until its undersaturation can lead to the formation of straetlingite.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Chemical Looping and Thermochemical Processes · Bauxite Residue and Utilization · Layered Double Hydroxides Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (42)
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