Objective Since the problems such as the difficulty of digesting bulk solid waste,the difficulty of dred-ging sludge treatment,and the traditional cement solidification sludge does not conform to the new development concept,the composite curing agent friendly to the environment was prepared by using steel slags,lime and des-ulfurization gypsum,which was applied in the field of silt soil curing treatment for the purpose of"waste treat-ment".Methods Tests on unconfined compressive strength,pH,scanning electron microscopy,etc.and their curing mechanism were carried out on solidified silt.Results the optimal ratio of composite curing agent was 5％steel slag,9％lime and 6％desulfurization gypsum,and the strength of cured soil was as high as 1.657MPa at the age of 28d,slightly lower than that of cement cured silt at the same age,and its ductility was also significant-ly improved.The alkaline environment was mainly provided by lime with the threshold of pH about 13,the pH value about 12～13 was most conducive to the hydration reaction.Microscopic characterization showed that AFt and C-S-H provided a skeletal structure for the cured soil,filling the pores of the particles to form a more dense mesh structure,which improved significantly the macroscopic mechanical properties of the silt-cured soil.Con-clusion This composite curing agent friendly to the environment can cure silt soil for construction backfill and road base fill,effectively improving the resource utilization of silt.
NETL
NSTL
维普
万方数据
