Influence of fly ash on the hydration of calcium sulfoaluminate cement

The effect of fly ash on the hydration of calcium sulfoaluminate cement was investigated. Increasing fly ash contents accelerated the hydration of calcium sulfoaluminate cement due to the filler effect. Dissolution rims around fly ash particles after 90 days indicated a reaction degree of the fly ash of approximately 20 to 30% as estimated by various independent methods. The contribution of fly ash to the hydration reactions resulted in the formation of calcium silicate hydrate (C-S-H), in an increase of the strätlingite content and in the destabilization of monosulfate. The mortar with 7.5 mass-% fly ash reached a higher compressive strength than the reference without fly ash when the water to cement ratio was kept constant. Up to 15 mass-% of fly ash could be added without strength loss.

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  • English

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  • Accession Number: 01634675
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 10 2017 10:49AM