ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 6

Optimization of Lime Content for Fly Ash

Sivapullaiah, PV
Senior scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

Prashanth, JP
Senior scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

Sridharan, A
Senior scientific officer, research scholar, and professor, Indian Institute of Science, Bangalore,

(Received 16 December 1993; accepted 10 October 1994)

Abstract

Abundant quantities of fly ash have been produced by thermal power plants situated all over the world. Many applications of fly ash depend upon its pozzolanic reactivity. This reactivity depends upon many factors, including lime content. Many fly ashes show marked improvement with the addition of lime. However, for every fly ash, there is an optimum lime content for its maximum reactivity. There is no well-established simple test to determine the optimum lime content. In this paper an attempt is made to use a simple physical and physico chemical test to determine the optimum lime content. The principle behind the use of a pH test, liquid limit test, and free swell index test to determine the optimum lime content has been explained. All the methods predict nearly the same optimum lime content and correlate well with that determined by the strength test.

Keywords:
calcium silicate hydrate, free swell index, fly ash, liquid limit, optimization, pozzolanic reactivity, pH, unconfined compressive strength

Paper ID: JTE10414J
DOI: 10.1520/JTE10414J
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