Abstract
Crushed particles are obtained by crushing a solidified dredged marine deposit mixed with cement. It is convenient if they can be used as an alternative fill material for such as reclamation behind seawall. However, it is well known that the cement-mixed soil is deteriorated by the calcium leaching in seawater. In the case of the crushed particles, the deterioration might be accelerated with an increase in contact area between crushed particles and seawater, which make a significant negative impact on an internal friction angle of crushed particles. We examined the deterioration effect on mechanical properties of the cement-mixed soil and its crushed particles using the samples exposed under quasi-marine environment. The test results revealed that when the crushed particles are exposed for 50 years in seawater, the influence of deterioration cannot be ignored and if the crushed particles are used as an alternative fill material of sand/gravel, some measures to prevent the deterioration such as increasing cement content are required.
