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Home CCSU Theses & Dissertations Stabilization of silty soil using fly ash

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Identifier	Spec 31
Author	Gaciarz, Rafal, 1972-
Title	Stabilization of silty soil using fly ash
Publisher	Central Connecticut State University
Date	2012
Resource Type	Special Project
Notes	Soil Stabilization occupies an important role in all Civil Engineering works. Now with the scarcity of good building sites, engineers are forced to use the available sites, modify their geotechnical properties and build facilities. In these direction different methods of soil stabilization offers them inexpensive but efficient solutions. Soil stabilization is the process of increasing strength and bearing capacity of soils either by mechanical or chemical methods. Stabilization also eliminates or decreases settlements, hydraulic conductivity and swell and shrinkage potential. The mechanical method of stabilization involves the change of gradation of the soil and densifying the soil by mechanical methods such as rollers. Chemical stabilization involves altering the properties by adding cement, lime or any other cementations material. In this study an attempt has made to investigate the efficacy of class C Fly Ash to stabilize silty soils. Varying proportions of fly ash was added and determined the basic geotechnical properties such as, specific gravity, plasticity, compaction characteristics, unconfined compression strength and stress-strain modulus. It has been observed that the addition of fly ash did not alter significantly the plasticity characteristics of the soil. Standard Proctor and Harvard Miniature Compaction Tests revealed that maximum dry density increases with increasing fly ash content and optimum moisture contents decreased with increasing in ash contents. Unconfined compression tests were conducted on compacted specimens corresponding water contents of optimum moisture contents (OMC), OMC-2%, and OMC+2%. It has been observed that the unconfined compressive strength (qu) and consequently the undrained shear strength (SuƠ) which is half the unconfined compressive strength increased moderately with increasing fly ash content for all the 3 moisture content conditions. However, the stress-strain modulus decreased with increasing ash content. The modulus and the unconfined compressive strengths of soil-fly ash mixtures can be expressed by an approximate formula: E=15 to 100qu Where, E = Stress-Strain modulus (either Tangent or Secant Modulus) qu = Unconfined compressive strength. From the analysis of the results of this study, it appears that fly ash is not an effective stabilizer to stabilize silty soils. This may be due to the fact that both silt particles and fly-ash particles have approximately same size. This might result in poor gradation that is deficient in particle interlocking in silt-fly ash mixtures. Another important property required for effective stabilization is plasticity. Unlike lime, fly ash is a low or non-plastic material and is not effective in binding the soil particles together
Subject	Soil stabilization Fly ash
Department	Department of Engineering Technology
Advisor	Basim, Swamy
Type	Text
Digital Format	application/pdf
Language	eng
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