ABSTRACT
Construction wastes such as concrete and asphalt have been reduced, recycled and reused. However, scraped woods are not sufficiently recycled, because its practical uses are limited. Attempts to improve material property of the scrapedwoods by adding biodegradable plastics (PLA) have been made in various fields. We are researching an applicability of biodegradable material for drainage layer in fill material. In this study, a granular material with biodegradability was buried under a ground during different periods to change degree of biodegradation. Mechanical behavior of the granular material was examined by various soil testing. Main conclusions are follows. 1) Biodegradable rate of the granular material is low as compared with other materials. 2) Compression and tensile strengths of a single particle decreases with increasing the duration in which the material was buried in the ground. 3) Influence of deterioration due to biodegradation on drained shear and cyclic strengths as particulate media is not recognized.
