| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide concrete using high quality regenerated aggregate produced from a plurality of return concrete having different performances (a plurality of return concrete having different nominal strength). <P>SOLUTION: A regenerated aggregate is obtained by: kneading a plurality of return concrete having different performances (a plurality of return concrete having different nominal strength); adding a setting retarding agent to the kneaded material to harden so as to develop desired strength in the kneaded material at a desired time; and grinding or roughly crushing and grinding the hardened material to remove a mortar component depositing on the aggregate surface. The regenerated aggregate is used as aggregate for concrete to produce the concrete by a conventional method. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
