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2016 ; 9
(7
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Hydration of Hybrid Alkaline Cement Containing a Very Large Proportion of Fly
Ash: A Descriptive Model
#MMPMID28773728
Garcia-Lodeiro I
; Donatello S
; Fernández-Jiménez A
; Palomo Á
Materials (Basel)
2016[Jul]; 9
(7
): ä PMID28773728
show ga
In hybrid alkaline fly ash cements, a new generation of binders, hydration, is
characterized by features found in both ordinary portland cement (OPC) hydration
and the alkali activation of fly ash (AAFA). Hybrid alkaline fly ash cements
typically have a high fly ash (70 wt % to 80 wt %) and low clinker (20 wt % to 30
wt %) content. The clinker component favors curing at ambient temperature. A
hydration mechanism is proposed based on the authors' research on these hybrid
binders over the last five years. The mechanisms for OPC hydration and FA
alkaline activation are summarized by way of reference. In hybrid systems, fly
ash activity is visible at very early ages, when two types of gel are formed:
C-S-H from the OPC and N-A-S-H from the fly ash. In their mutual presence, these
gels tend to evolve, respectively, into C-A-S-H and (N,C)-A-S-H. The use of
activators with different degrees of alkalinity has a direct impact on reaction
kinetics but does not modify the main final products, a mixture of C-A-S-H and
(N,C)-A-S-H gels. The proportion of each gel in the mix does, however, depend on
the alkalinity generated in the medium.