The existing treatment method for chemical solidification of dredged sludge is to first add water absorbent and then solidifying agent to the sludge.Although this method reduces the amount of solidifying agent used,the solidifying agent is difficult to mix when preparing the solidified soil.This behaviorweakens the solidification effect and slows down the engineering progress,which is not conducive to engineering applications.Therefore,a sludge solidification treatment method that first solidifies soil and then absorbs water was proposed.By conducting titration tests,unconfined compressive strength tests and mercury intrusion tests,the solidification effects and mechanisms of the two treatment methods,vizfirst water absorbent and then solidifying agent,first solidifying agent and then water absorbent,were compared and analyzed.The experimental results show that,compared with that of the method of first water absorbent and then solidifying agent,the solidification effect of the method of first solidifying agent and then water absorbent is better,the solidified sludge soil with a higher Ca2+content and unconfined compressive strength.This is because the method of first solidifying agent and then water absorbent produces solidified soil with a larger pore content in small pore size,indicating a muchdenser soil structure.Anew idea and technical references for the engineering preparation of solidified sludge soil can be provided.
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