Role of total reactive oxide ratios on strength development in activated fly ash

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

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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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IITH Creators:
IITH CreatorsORCiD
K V L, Subramaniam
Item Type: Article
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: Team Library
Date Deposited: 18 Aug 2017 06:20
Last Modified: 18 Aug 2017 06:20
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