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EFFECT OF FLY ASH ON CEMENT HYDRATION IN AQUEOUS SUSPENSIONS

Ceramics (Praha), 2006-01, Vol.50 (2), p.98-105 [Peer Reviewed Journal]

ISSN: 0862-5468

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  • Title:
    EFFECT OF FLY ASH ON CEMENT HYDRATION IN AQUEOUS SUSPENSIONS
  • Author: Jozic, D ; Zelic, J
  • Is Part Of: Ceramics (Praha), 2006-01, Vol.50 (2), p.98-105
  • Description: The effect of fly ash on the early stages of cement hydration in aqueous suspensions (w/s = 4, T = 20 C) was examined. According to the ASTM C618 Standards, the fly ash used belongs to the F class fly ash, i.e. to low CaO content fly ash. Fly ash was added as a replacement for cement in amounts of 0, 5, 11, 15, 20, and 30 wt%. Conductometric measurements in suspensions indicated that the replacement postpones the start of precipitation of Ca(OH)2, prolongs the duration of that precipitation, and reduces the overall cement hydration rate. XRD and DTA-TG/DTG measurements indicate that the share of Ca(OH)2 in the solid part of the suspension decreases when the fly ash addition increases, while the results of the DTA-TG/DTG analysis corrected to the cement weight confirm the role of fly ash as nucleation site where hydration products settle, while its pozzolanic activity has not been seen in this period of hydration up to 72 h. 20 refs.
  • Language: English
  • Identifier: ISSN: 0862-5468
  • Source: TestCollectionTL3OpenAccess
    Alma/SFX Local Collection
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