Title:
路盤材の製造方法
Document Type and Number:
Japanese Patent JP5857996
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce a roadbed material which is difficult to cause expansion due to ettringite generation even when a granular material having high elution concentration of Al is used in a roadbed material production method using air-cooled blast furnace slag and other granular materials as raw materials.SOLUTION: A method for producing a roadbed material includes a step A of crushing air-cooled blast furnace slag, a step B of aging the air-cooled blast furnace slag having been subjected to the step A, a step C of removing fine grains having a grain size of 0.075 mm or less from the air-cooled blast furnace slag having been subjected to the step B, and a step D of mixing a granular material other than air-cooled blast furnace slag with the air-cooled blast furnace slag having been subjected to the step C. In the air-cooled blast furnace slag, SO, which generates ettringite, is enriched in the fine grains having a grain size of 0.075 mm or less. By removing the fine grains in the step C, a roadbed material difficult to cause expansion due to ettringite generation can be produced even when a granular material having high elution concentration of Al is used.
Inventors:
Keiji Watanabe
Application Number:
JP2013073113A
Publication Date:
February 10, 2016
Filing Date:
March 29, 2013
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C04B5/00; B09B3/00; B09B5/00; E01C3/00
Domestic Patent References:
| JP9105105A | ||||
| JP62223044A | ||||
| JP2011001233A |
Attorney, Agent or Firm:
Hideto Tomabechi