Critical Assesment On The Stabilization Of Expansive Soils By Different Techniques

The evaluation and criticism of the stabilization of expansive soil by differentrntechniques base on the researches done. To list them:-rn1. A Research on “Stabilization of expansive clay soil with sugar cane molassesrnand cement” for the Study Area of Modjo – Ejere – Arerti – Sembo RoadrnProject with different mix ratios and come up with a finding that Soil treatedrnwith cement and molasses combination gave a significant improvement inrnstrength than when cement and molasses alone and meaningfully reducedrnswelling property of the expansive soil. Also it was effective in arresting linearrnshrinkages and eliminated shrinkage cracks that were observed in soilrntreated with cement alone.rn2. A research on “Stabilization of Expansive clay soil with lime “ for the StudyrnArea Adura-Burbey Road project, Gambella and come up with a findingrnthat expansive Soil treated with the addition of lime alone gave a reduction ofrnthe free swell, reduction in plasticity limit; improve the CBR, increase of thernunconfined compressive strength.rn3. A research on “The chemical treatment of “Block Cotton” soil to make itrnusable as a foundation material”for the study area of ten samples from AddisrnAbaba ‘’Black –cotton’’ soils and come up with a finding that the geotechnicalrnproperty these expansive soils have been improved from a vary highrnexpansive to a moderate expansive soils by the addition of 6% lime and 12%rncement independently by dry weight of the native soil.rn4. A researcher on “Evaluation of Sodium Silicate and its Combination withrnCement/Lime for soil stabilization” for the study area of in situ soil of AddisrnAbaba’s Bole Senior Secondary and Preparatory School and borrowedrnmaterial from Gergi-Bole Road section and has come up with the finding thatrnSodium Silicat has an inhibiting effect on strength development of clayeyrnsand soil-cement mixture when its quantity is increased to and beyond 2.5%rnby dry weight of the soil. But Applying lower amount like 1% sodium silicaternAAiTrnSchool of Graduate Studiesrnby dry weight of the soil in concert with ordinary Portland cement is used itrnhas positive implications on strength development .But using Sodium silicaternas chemical stabilization with or without lime is not a suitable additive forrnmontmorillonitic clay (expansive soil) stabilization.rn5. A researcher on “Bagasse Ash as a Sub-grade Soil Stabilizing Material” forrnthe Study Area of Addis Ababa, Bole Sub City around Bole Medhanialemrnchurch and come up with a finding that While treating expansive soil, withrnan increase in the bagass ash addition alone, there is a decrease in freernswell, free swell index and free swell ratio but it is with a slight decrease inrnthe plasticity and a slight increase in the CBR value. But the addition ofrnbagasse ash in combination with lime improved the CBR value, andrnplasticity index decreased significantly.rnSo, from critically evaluating these, the lime content increase the PI ratio,rnFree swell ratio and CBR swell ratio all shows increasing, indicating that thernPI, the free swell and the CBR swell values are all decreasing in a directrnproportion. In addition, in case of the free swell ratio verses the lime contentrnit can be approximated that all the graphs do overlap one over the otherrnmeaning the testing procedures and the precision during the testing arernapproximated to be equal. Yet, a more different scenario is observed duringrnthe CBR swell tests verse the lime content this may arise due to the soilrnsample preparation and testing procedures.rnAnother evaluation is as the cement content increase the PI ratio showsrnincreasing indicating that the PI values are decreasing .In addition ,it can bernseen that the PI ratio gets flat beyond some 6% to 12% cement additionrnindicating that further addition do not have an significant impact on the PIrnvalue.rnKey Words: Cement, lime, Sodium silicate, Bagass Ash, Expansive ClayrnSoil, Sugar Cane Molasses, Soil Modification, Soil Stabilization. CriticalrnReview

Get Full Work

Report copyright infringement or plagiarism