Improvement of Liquefaction Resistance of Reclaimed Sand in Water-An Experimental Study

Tseng-Hung Chang ； Huei-Wen Chang

《Journal of GeoEngineering》 5卷2期 (2010/08) Pp. 39-49

https://doi.org/10.6310/jog.2010.5(2).2

並列摘要

This study identified mechanical properties, liquefaction mechanisms and improvement effects of cement treated sand during sedimentation in water. In this study, an optimum ratio pattern of cement treated sand to untreated reclaimed sand was established for land reclamation or liquefaction prevention. Danang sand was the primary backfill material. The water sedimentation method was utilized to prepare soil specimens under different contents of cement and coagulant and curing times. A series of unconfined compression tests and cyclic triaxial tests was carried out. Experimental results demonstrate that the unconfined compression strength of cement treated sand was decreased significantly as cement and sand particles separated during backfilling into water. However, by adding polyacrylamide as a coagulant to cement treated sand, the loss of unconfined compression strength was reduced effectively. The main contribution of this study is the application of polyacrylamide to cement treated sand for land reclamation in water. Under 6% cement content, 344 mg/kg coagulant content (polyacrylamide) and curing time of 28 days, the seismic capacity of this cement treated sand on the seismic intensity scale was 6 for Taiwanese standards.

並列關鍵字

Liquefaction ； cement treated sand ； coagulant ； cyclic resistance