Abstract：In order to reduce clay amount needed in the landfill liner system and recycle the sewage sludge, the sewage sludge ash (SSA), which was produced in the burning of sewage sludge, was used to improve the traditional liner system. To estimate the engineering properties of the landfill compacted clay liner system containing SSA, the consolidated compression test, the low temperature nitrogen adsorption test, the particle size analysis test were performed to determine the compression characteristic, the micro pore structure, the grain composition of the compacted clay modified by SSA. The result of the consolidated compression test indicated that with the increasing of the SSA content, the void ratio of the modified clay contaminated by the landfill leachate increased and the amount of the compression of it was decreased. After the modified clay was contaminated by landfill leachate, the compressibility and consolidation coefficients of the modified clay were separately between 0.310~0.391MPa-1, 2.446~2.768cm2/s. The low temperature nitrogen adsorption test suggested that the adsorption-desorption isotherm of the modified clay contaminated by landfill leachate belonged to V kind. The shoulder peak existed on the curve of the pore size distribution. The curve showed that the amount of pore between 3~7nm was larger and the accumulated pore volume was between 0.509~0.530cm3/g. The content of pore larger than 11.5μm was 35.09%~49.42%, the content of pore between 2.3~11.5μm was 2.35%~7.28%, and the content of pore smaller than 2.3μm was 46.57%~57.63%. Hence, the compacted clay containing SSA can efficiently resist corrosion, and it can be applied to landfill liner system.
