Environmental Chemistry Part I Examination

May 5th, 2015
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(a)Give four major processes that contribute to the soil acidity. (20 marks) (b)How do you recognize the soil pollution? (20 marks) (c)Explain the following methods of soil treatments briefly using examples. (i)Steam stripping (ii)Vacuum extraction (iii)Aeration

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GROUND IMPROVEMENT SOLUTIONS FOR CONSTRUCTION OF HIGHWAYSGROUND IMPROVEMENT SOLUTIONS FOR CONSTRUCTION OF HIGHWAYS CHAPTER ONE 1.1 INTRODUCTIONWhen a project encounters difficult foundation conditions, possible alternate solutions are: Avoid the particular siteDesign the planned structure accordingly.Remove and replace unsuitable soils.Attempt to modify the existing ground.Relatively few options are available in choosing the ground materials and site conditions that must be accounted for in the design of highway projects. The project must be constructed under the conditions that are present at the particular site; minimal disturbance to existing elements of the roadway is also a key control factor in the selection and design of the rehabilitation or reconstruction scheme (Woodward 2005).1.2 OBJECTIVES OF GROUND IMPROVEMENTGround improvement is carried out for various objectives: to improve bearing capacity and reduce settlement of soft ground, prevent earthquake liquefaction, control groundwater, stabilize excavation bottom, prevent deformation of surrounding ground, or clean up contaminated ground. Ground Improvement provides a fast-track vehicle (Raison 2004). 1.3 SCOPE This paper is an integrated approach to ground improvement solutions in highway engineering, its objectives and the identification of various methods of ground improvement.CHAPTER TWO2.1 GROUND IMPRROVEMENT METHODSClassification of Ground improvement Techniques: There are four groups of Gr

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