Stabilization Of Light Grey And Red Clay Subgrade Soil Using Sa-44ls-40 Chemical And Lime

This study is undertaken on a light grey (expansive) and a redrnclay soil samples taken from within Addis Ababa. The change inrnengineering properties of these soils treated with SA-rn44/LS-40 chemical alone, lime alone and combinations of bothrnat different application rates are investigated.rnThe investigation of the modifications in engineering propertiesrnof the stabilized soils are made using laboratory tests thatrninclude soaked CBR and CBR swell tests, swelling pressurerntest, Atterberg limit tests, percent swell test and free swell tests.rnThe modifications in engineering properties were evaluatedrnafter curing the treated sample for fourteen days.rnFrom the study, it is observed that the application of lime alonernand SA-44/LS-40 chemical with lime shows improvements ofrnvarying degree on the engineering properties of both the lightrngrey and the red clay soils. However, no specific mix ratiornshowed the maximum improvement in all the engineeringrnproperties of each soil. This suggests that before deciding forrnlarge-scale applications, the desired improvement level of thernengineering properties of a particular soil should be specifiedrnfirst, and tests be conducted for different mix ratios to arrive atrnthe optimum one.

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