Study on the road performance of industrial waste composite solidified silt
In order to solve the problems that poor mechanical properties of silt cannot be di-rectly used for roadbed filling and a large amount of industrial waste cannot be utilized as re-sources,based on the concept of waste to waste,this study selects three kinds of industrial waste as raw materials,namely,fly ash,microsilica fume and calcium carbide slag,to solid-ify the silt deposited in Qingdao's Jiaozhou Bay area.The cement-mixed solidified silt is used as a control group.A series of experimental studies are conducted to evaluate the road performance of S-FSC(industrial waste solidified silt)through the unconfined compressive strength test,direct shear test,wet and dry cycle test and freeze-thaw cycle test.The X-ray diffraction and scanning electron microscope test methods are used to conduct microanalysis of the S-FSC solidified silt and to reveal its solidified mechanism.The test results indicate that products such as hydrated calcium silicate and hydrated calcium aluminate,generated by the volcanic ash reaction between fly ash,microsilica fume and calcium carbide slag,can tightly associate the soil particles and fill the pores of the soil at the same time,which leads to a significant improvement in the mechanical properties and the durability of the solidified silt.
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