Effect of Pozzolanic Reactivity on Compressibility Characteristics of Stabilised Low Lime Fly Ashes |
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Authors: | Arif Ali Baig Moghal Puvvadi V Sivapullaiah |
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Institution: | (1) Eng. Abdullah Bugshan Research Chair for Expansive Soils, Department of Civil Engineering, College of Engineering, King Saud University, Riyadh, 11421, Saudi Arabia;(2) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560012, India |
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Abstract: | This paper presents the effects of addition of lime and lime along with gypsum on the compressibility behavior of two class
F fly ashes. Since the fly ashes develop strength and exhibit lower compression, consolidation testing with conventional duration
of load increment may not be appropriate. Hence, an attempt has been made to assess the minimum duration of load increment
necessary to study the compressibility characteristics of such materials. Thus compressibility behavior of fly ashes with
additives has been studied using conventional consolidation test with different durations of load increments varying from
30 min to 48 h. The results obtained indicated that 30 min of duration of load increment can be used to assess the compressibility
behavior of such materials. The effect of lime which reduces the compression is seen to be maximum from the results obtained
with the duration of load increment of 30 min but gradually reduces with higher durations of load increment. It has also been
observed that the rate of decrease in the compressibility is maximum up to 2.5% lime and gradual thereafter. The compressibility
of lime treated fly ashes further reduces when gypsum is incorporated, the optimum gypsum percentage being 2.5. This reduction
in the compressibility of fly ashes enhanced by incorporating lime and gypsum makes them versatile in the construction of
embankments and for structural fills, particularly reducing the time required in between laying of each lift. |
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