Title:
ROADBED MATERIAL PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2022/202522
Kind Code:
A1
Abstract:
Provided is a method for easily producing a roadbed material in which a crushed product of cured cement containing hexavalent chromium is used a raw material, and which less readily elutes hexavalent chromium. This roadbed material production method includes a carbonation treatment step for subjecting crushed cured cement containing hexavalent chromium to a carbonation treatment using carbon dioxide-containing gas having a temperature of 50-140°C and moisture content of 1.5% or higher to obtain a roadbed material that elutes the hexavalent chromium less readily than before the treatment. The production method includes, preferably prior to the carbonation treatment step, a crushing step for crushing cured cement containing hexavalent chromium to obtain a crushed product in which particles having a particle size of 100 mm or less account for 50 mass% or more, and particles having a particle size of 2.36 mm or less account for 1 mass% or more.
Inventors:
NOZAKI TAKAHITO (JP)
FUKUOKA AOI (JP)
ICHITSUBO KOUKI (JP)
HAYAKAWA TAKAYUKI (JP)
NOGUCHI TAKAFUMI (JP)
WANG DIANCHAO (JP)
FUKUOKA AOI (JP)
ICHITSUBO KOUKI (JP)
HAYAKAWA TAKAYUKI (JP)
NOGUCHI TAKAFUMI (JP)
WANG DIANCHAO (JP)
Application Number:
PCT/JP2022/011846
Publication Date:
September 29, 2022
Filing Date:
March 16, 2022
Export Citation:
Assignee:
TAIHEIYO CEMENT CORP (JP)
UNIV TOKYO (JP)
UNIV TOKYO (JP)
International Classes:
E01C3/00
Foreign References:
| JP2011255269A | 2011-12-22 | |||
| JP2003334532A | 2003-11-25 | |||
| JP2010221156A | 2010-10-07 | |||
| JP2009028581A | 2009-02-12 |
Other References:
ENVIRONMENTAL QUALITY STANDARDS FOR SOIL POLLUTION, 23 August 1991 (1991-08-23)
Attorney, Agent or Firm:
MURACHI Toshiya (JP)
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