Blending Of Cinder With Fine Grained Soil To Be Used As Sub-base Materials (the Case Of Butajira Gubre Road)

In road construction, the use of locally available materials should be made as much as possible.rnHowever, these materials are not always suitable and when appropriate material cannot be foundrnin areas close to the construction site, very high prices have to be paid with significant timerndelays and cost increases.rnIn many parts of Ethiopia, there is widely distributed cinder gravel. However, this material hasrnthe problem of compaction due to its light weight, its rough circular surface and its high porosity.rnThis thesis deals with investigating the performance of mechanically stabilized natural cinderrngravels to be used as road sub-base material. To achieve the Ethiopia Road Authority manualrnspecification, the cinder gravel was blended with some trail proportion of 0, 5, 10, 15, 20, and 25rn% of fine-grained soil by mass and different tests including grain size distribution, AtterbergrnLimit, compaction, CBR, LAA, absorption and linear Shrinkage are conducted in the laboratory.rnBased on the laboratory test results it is shown that, from both MDD- percent of fine-grained soilrncurve and CBR-percent of fine-grained soil curve, the optimum amount of fine-grained soilrnrequired in order to improve its properties is 19 % by mass proportion.rnKEY WORDS: sub-base, Cinder Gravel, Blending of sub-base material, Optimum finegrainedrnsoil Content, Gradation, Arithmetical proportioning.

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