| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problems wherein coating of an undersea pipeline with mortar or concrete cannot yield satisfactory density and wherein conventional high-density heavy mortar or concrete can be applied to the pipeline to yield satisfactory density but cannot be sprayed around the pipe due to insufficient fluidity. <P>SOLUTION: The pipeline comprises a heavyweight aggregate comprising at least one chosen from FeO, Fe<SB>2</SB>O<SB>3</SB>and metal iron, provided that spherical particles account for 20% or more of total particles in the aggregate and particles that pass through a sieve with a nominal mesh size of 0.15 mm account for 10-20 mass% of the total particles in the aggregate. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
