Abstract
The study introduces a technique to regenerate hydraulicity in C3S by thermally treating powders from crushed hydrated alite cubes at various temperatures (ranging from 400 °C to 800 °C). Several characterization techniques, including XRD, FTIR, 29Si-NMR, SEM, and helium pycnometer were used to comprehend the mechanisms behind hydraulicity regeneration. XRD analysis showed anhydrous binder powders with β-C2S, Calcite, and calcium oxide phases after heat treatment, with β-C2S appearing at 600 °C. Hydration of regenerated binders resulted in Portlandite and Calcite phases, and the amorphous phase increased with curing due to the C-S-H formation confirmed by FTIR peaks. NMR analysis revealed distinct characteristics in TP800's C-S-H compared to the original C3S paste, primarily due to shorter chain lengths.
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