| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a track bed ballast material which is excellent in properties such as a water absorption rate, water absorption pressure resistance, a compression crushing ratio or a unit volume mass, also excellent in bearing capacity and resistance force, and more inexpensive than crushed stone, because converter slag to which aging treatment is applied is used, and which can form a circulation type society of 'local production for local consumption' by utilizing effectively byproducts discharged every day from an iron mill, secure stable quality, and protect natural environment linking to resource saving, energy saving or CO<SB POS="POST">2</SB>reduction, because rocks are not required to be dug since crushed stones are not used. <P>SOLUTION: This method has a constitution including a crushing step for obtaining particle-size adjusted slag formed by crushing slowly-cooled converter slag and adjusting the particle size; a piling step for piling the particle-size adjusted slag, and covering it with a heat-resistant sheet-like material; and an aging step for performing aging treatment by supplying steam from the lower side of the particle-size adjusted slag piled in the piling step. <P>COPYRIGHT: (C)2013,JPO&INPIT |
