Experimental study of solidification of soft dredger fill in Tianjin Binhai New Area

There is large area of soft dredger fill in Tianjin Binhai New Area, which hard to meet the requirements of engineering construction, needed to be solidified. Through selecting cement as main agent; gypsum, NaOH, Na2CO3, and FeCl3 as assistant additives, a series of indoor consolidation experiments are performed for soft dredger fill with different water contents in Tianjin Binhai New Area. Using unconfined compression strength as a main factor, analysis of microstructure for solidified soil are made by choosing two kinds of solidification agent which are used for different programs through effective comparison and screening. The results show that solidified soft dredger fill in Tianjin Binhai New Area with cement and appropriate as well as a moderate amount of additional agent has an obvious advantage than solidified with pure cement. Microstructural analysis shows that compared with the same age of cement soil, more hydration and less pore content and more stable microstructure features generated by the solidified soil, which can explain the phenomenon from the mechanism.