LONG-TERM STRENGTH PROPERTY AND MARINE ENVIRONMENT ADAPTABILITY OF SOIL BLOCK PRODUCED BY CEMENT-MIXING AND MECHANICAL DEHYDRATION

Abstract

 Authors have developed a technique, called the cement-mixing and mechanical dehydration (CMD), as one of recycling techniques for dredged soils. In order to investigate the long-term strength property and the adaptability for marine environment, unconfined compression test and a series of ecology observation were performed for the CMD soil blocks exposed on the costal environment around Hakata Bay. The main conclusions obtained from this study are as follows; 1) the CMD technology can created soil blocks having the unconfined compressive strength of more than 10 MPa. 2) the water cement ratio is a practical index to evaluate the strength of CMD soil block instead of density and cement content. 3) the CMD soil blocks have high durability during exposure test against marine environment for 41 months. 4) since the coverage and number of animals and plants on the CMD soil block exposed in tidal zone and sea water are similar trend indicating the seasonal change as nearby concrete wall, the CMD soil block have sufficient adaptability for marine environment.