| 摘要 |
<p>PROBLEM TO BE SOLVED: To solve such problems that insufficiency of strength and expansion due to free MgO, of a roadbed material produced by crushing a slag hardened body using steelmaking slag as a part of the raw material, and rise in pH of water in contact with the roadbed material, are caused. SOLUTION: The production process of this roadbed material comprises mixing a mixture which contains granular molten pig pretreatment slag as steelmaking slag and also contains fine powdery blast-furnace slag as an SiO2- containing material, with water, to obtain a mixture and to harden the mixture crushing the resulting hardened body, wherein in the above mixture, on the basis of the total mass of all the components of the mixture, the content of the granular molten pig pretreatment slag having >=1.18 mm grain size is 15-55 mass % and the content of the fine powdery blast-furnace slag is 5-40 mass %, and the pH of water brought into contact with the roadbed material, after the contact, is <=10.</p> |
