Title:
Fly ash-limestone ternary composite cements: synergetic effect at 28 days.
Author(s):
Klaartje De Weerdt, Harald Justnes, Knut O. Kjellsen,Erik Sellevold
Publication:
NCR
Volume:
42
Issue:
4
Appears on pages(s):
51-70
Keywords:
Ternary cement, fly ash, limestone, carboaluminate hydrate
DOI:
Date:
12/15/2010
Abstract:
Composite cements containing OPC, fly ash and limestone powder were tested in paste and mortar after 28 days of curing at 20ºC to verify a postulate claiming that calcium aluminate hydrates produced by the pozzolanic reaction of fly ash would react further with limestone to form calcium carboaluminate hydrates and thereby increase the total amount of hydrates and consequently strength. Thermogravimetric tests indicated indeed a change in hydration products when limestone powder was included in the system. This was also confirmed by X-ray diffraction showing the formation of calcium carboaluminate hydrates. It was demonstrated that this synergetic interaction between fly ash and limestone increases the compressive strength more than cement replacement by limestone alone.
Norwegian Concrete Association, International Partner Access
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