SLAG FOR ROADBED MATERIAL AND METHOD OF MANUFACTURING SLAG FOR ROADBED MATERIAL

摘要

PROBLEM TO BE SOLVED: To suppress a Pb elution amount within an environmental standard without elevating manufacturing costs in a slag for a roadbed material.;SOLUTION: The slag for a roadbed material is obtained by pulverizing a steel slag containing Pb of 0.1 ppm or more and a basicity of the steel slag (CaO/SiO₂) is 1.5 or more. The slag for the roadbed material has a particle size distribution which a mass ratio occupied by the slag particle having a particle size of 100 μm or less to all slag particles after pulverization is 0.5 wt.% to 3.5 wt.% and satisfies the relations that the product of the mass ratio occupied by the slag particle having 100 μm or less and the Pb concentration of the slag particle after pulverization (ppm) is 15 or less.;COPYRIGHT: (C)2014,JPO&INPIT