| 摘要 |
PROBLEM TO BE SOLVED: To provide a roadbed material for rail track construction, suppressing long-term strength while achieving fascilitation and time reduction of repair work while securing necessary strength of roadbed materials.SOLUTION: There is disclosed a roadbed material used for rail track construction including aggregate and a binder for binding aggregate with each other, where glass foam is contained as aggregate, with compressive strength set within a predetermined range by adjusting foaming rate of glass as the aggregate. Also the glass foam has uniaxial compression strength set at 2-4 N/mm, is produced by adding a foaming agent to waste glass and firing. The binder includes early-strength portland cement as principal component. |
