Abstract
In order to recycle dredged clay as an useful material efficiently, our research group has developed a technique called the cement-mixing and mechanical dehydration method (called "CMD"). In the CMD procedure, soft clay mixed with cement is dehydrated with a high dehydration pressure for the purpose of increasing strength. In this paper, large dredged soil blocks were created by a large dehydration apparatus (φ53.4cm×H100cm) in the CMD procedure, and the water content and unconfined compressive strength were measured in order to investigate the uniformity and strength property of the CMD blocks. The main conclusions obtained from this study are as follows: (1) Uniform and large-size blocks are able to be produced irrespective of cement content and soil type. (2) Since the unconfined compressive strength cured for 28 days, qu28, exceeded 20MPa for more than cement content 40%, the high-strength blocks are able to be produced by controlling the cement content. (3) It is considered that there is close relationship between unconfined compressive strength and water-cement ratio.
