| 摘要 |
PROBLEM TO BE SOLVED: To provide a material for filling capable of preventing vitreous small pieces of foaming igneous rock (obsidian perlite) from scattering, having excellent water permeability, strength, and workability, and allowing a packing material to decompose or collapse after long time elapses in the earth. SOLUTION: This material for filling is provided with the packing material having at least a part constituted by a water permeation paper and the foaming igneous rock covered with the packing material and has initial water permeability. COPYRIGHT: (C)2005,JPO&NCIPI
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