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The study was aimed to evaluate effectiveness of utilizing a
self-cementing fly ash derived from combustion of lignite at
Afşin Elbistan thermal power plant in stabilizing a fine
grained clayey soil (CL). Grain size and Atterberg limits
analysis, compaction and triaxial compression tests were
carried out on the clayey soil samples (pure soil) and also
the samples of soil mixtures added various percentage of fly
ash were prepared. The samples were used for triaxial
compression test at optimum moisture contents determined by
standard proctor test. The test results revealed denote that
the shear strength of soil increases considerably with both
addition of fly ash and curing time. Furthermore, the fly
ash treatment and curing process brings also soil in more
granular nature due to flocculation of the clay particles by
cementation. It is clearly seen that Afşin Elbistan power
plant fly ash is a very suitable material for improving of
fine grained cohesive soils. Furthermore, utilization of
Afşin Elbistan fly ash in soil stabilization was determined
a positive influence on the environment and the economy.
Key words:
Fly ash, cohesive soil, shear strength, soil stabilization. |
