Singh, G V P B and K V L, Subramaniam
(2017)
Role of total reactive oxide ratios on strength development in activated fly ash.
MATEC Web of Conferences, 120.
02014.
ISSN 2261-236X
Abstract
The role of individual reactive components and process variables
such as molarity and temperature on alkaline activation of different low-
calcium fly ash is explored. The oxide ratios in the activated system, based
on the total silica (total SiO
2
) in the system consisting of the reactive silica
contributed by fly ash and the reactive alumina in fly ash are shown to
provide consistent results for achieving the highest strength. For a given
total SiO
2
content in the system, an increase in the sodium content above a
certain dosage does not influence the ultimate compressive strength. An
optimum (total SiO
2
) to Na
2
O ratio, equal to 2.66 is established for
achieving maximum strength. The role of temperature within the range of
60
o
C-85
o
C is not significant when the molarity of NaOH is high. A N-A-S-
H type gel with Si/Al ratio ranging between 2.5 to 3.0 and the Al/Na ratio
varying between 1.30 to 0.9 is formed on decreasing the (total SiO
2
)/Na
2
O
ratio from 6.55 to 2.66
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