Fly Ash Literature Review
CHAPTER -3 LITERATURE REVIEW
3.1 INTRODUCTION: The soil which contains the silt and clay particles show considerable sign of distress accompanied by loss of strength of the soil during rainy seasons and shrinkage during summer. Due to this reason, such soils need treatment to use as engineering materials. Black cotton soil is the type of soil which lose their strength during rainy season due to their expansive behavior.
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3.2 FLY ASH STABILIZATION: - Fly ash itself has less cementitious value but it reacts chemically and form cementitious compound in presence of moisture. Cementitious compound formed improves the strength and compressibility of soil (Karthik et al.,
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Author found that the optimum ratio of fly ash with clayey soil is 15% by weight of soil. A dramatic reduction in the properties of soil is seen for 0% to 15% of fly ash content but no noticeable decline appear in the range 15% to 20% of fly ash content. For compaction, the dry density and OMC were measured for various fly ash ratios. The dry density raise as the fly ash increases up to 15%, then reduced to 1.53 at 20% of fly ash. The liquid limit decreased from 55% to 48% for increase of fly ash from 0% to 15% by weight. Plasticity Index changes from 30% to 13% for addition of 0% to 15% of fly ash. C.B.R value of soil changes from 3% to …show more content…
Soil has specific gravity 2.56, Liquid limit 48.5%, Plastic limit 22.7%, Plasticity Index 25.8%, Shrinkage limit 8.61%. Authors made a series of laboratory experiments on 5% lime mixed with 5%, 10%, 15% and 20% of RHA by weight of dry soil. The CBR value is increased by 287.62% and unconfined compressive strength is improved by 30%. The Differential free swell index is decreased by 86.92% with increase of RHA form 10 to 20%.
Yadu and Tripathi (2013) stabilized the soft soil, collected from Tatibandh-Atari, rural road of Raipur Chhattisgarh, by the use of Granulated blast furnace slag and fly ash. The soil was classified as CI-MI as per Indian standard classification system. Different amount of GBS, i.e. 3, 6 and 9% with different amount of fly ash i.e. 3%, 6%, 9% and 12% were used to stabilize the soil. Based on compaction and CBR test, authors concluded that the optimum amount of GBS with fly ash was a 3% fly ash and 6%
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