Study on the early strength characteristics and source mechanism of solidified dredged marine sediment based on moisture transformation

Abstract

Context Large land areas are occupied by dredged sediments with which the strength of the solidified soil develops slowly, and this has become an instant problem in geotechnical engineering. Aims This study was designed to investigate the performance of solidified dredged deposits treated by sulfoaluminate cement for sludge solidification, and whether the mechanism for early strength development is based on water transfer. Methods With sediments dredged from Dalian Bay as the research objects, the strength, deformation and amount of moisture transferred by the solidified sludge were measured and analysed and referred to the data for Portland cement. Key results Sulfate aluminium cement is characterised by great early strength. Conclusion The mechanism for early strength development relies on reactions that form crystalline calcium vanadium stone. Implications Our study showed that calcium vanadium stone plays a critical role in early strength development, and this was measured quantitatively for the mineral water form.