INFLUENCE OF FLY ASH ADDITION ON THE MECHANICAL PROPERTIES OF TREATED DREDGED MATERIAL

The objectives of these experiments were to identify the effect of fly ash on the strength behavior and its strength durability on the extreme conditions. The improvement in mechanical properties such as optimum moisture content, pH values and unconfined compressive strength values were investigated. Sediment-cement mixture and sediment-fly ash-lime-cement mixture were prepared and compacted at the optimum water content. Unconfined compressive strength tests were then performed on these mixtures in normal conditions and in extreme condition. The UCS value gained by specimen treated with lime was continuously increase up to 100 days, although the percentage of increase of UCS value strength almost stop after 60 days. The research has shown that, from the comparison of these three various specimens, the sediment stabilized by fly ash-lime cement have the most potential values than the others to offer an alternative for stabilization of dredged sediments.