CONCRETE BOUNDARY BLOCK, LIGHTWEIGHT CONCRETE SECONDARY PRODUCT, AND MANUFACTURE OF LIGHTWEIGHT CONCRETE SECONDARY PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a concrete boundary block having both of strength and a lightweight property. ;SOLUTION: A concrete boundary block is that in which a foam synthetic resin core material 3 is embedded inside a formed concrete 2, and a bulk ratio of the core material 3 to the entire block 1 is 25 to 50%, and it is preferable that the expansion ratio of the core material 3 is 10 to 100 times, and the diameter of the aggregate 4 of concrete 2 is 25 mm or so. In this concrete boundary block, the load of bending strength measured by the bending test method stipulated in the JIS A 5307 is 60 kN or more.;COPYRIGHT: (C)1999,JPO