Research about stabilization of clay with many kind of stabilizers such asudcement, lime soil, cane pulp ash are commonly done. However, study of clayudstabilization soil is still interesting subject to be investigated. This researchudinvestigates the shear strength of fly ash stabilized clay which is due to cohesiveudvalue (c) and friction angle value (Ф).udThe research divided into 2 steps of test, for the initial test in order to findudthe OMC (Optimum Moisture Content) condition of clay, this step covers clayudcharacteristics test (water content test) and standard proctor test (compactionudmethod). The second step is triaxial test, in order to find the shear strength of clayudstabilized with fly ash. The percentage of fly ash which is added is: 0%; 15%,ud20%, 25%, and 30%. By using Mohr circle, the cohesive value (c) and frictionudangle value (Ф) can be found.udThe results of the research are: clay reach the optimum moisture contentudwhen added with 901.54 ml of water, and reach the maximum shear strength whenudadded fly ash as much as 30% with 2 kg/cm2 pressure given. Exchange of positiveudion between clay and fly ash results the change of friction angle value (Ф),udwhereas hydration reaction get the increment of cohesive value (c). Friction angleudvalue reach the optimum value on 7th day of curing time, and cohesive valueudincrement determined by fly ash addition and curing time period. By fly ashudaddition, the shear strength of clay increases.
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