PURPOSE: To obtain the title composition excellent in conductivity by utilizing hydraulic substance, conductive substance and a specified aggregate as a main component.

CONSTITUTION: 100 pts.wt. hydraulic substance consisting of a mixture of cement, water glass, calcium aluminate and gypsum as a main component, conductive substance consisting of 0.5W10 pts.wt. conductive fiber (e.g. graphite fiber) having 3W100mm length and 5W1000μm diameter and/or 1W100 pts.wt. conductive powder (e.g. carbon black) having 1000W8000cm2/g Blaine's specific surface area, 50W300pts.wt. aggregate (e.g. air-granulated slag in steel manufacture) incorporating ≥15wt.% Fe2O3 and in accordance with necessity, an aggregate such as sand and ballast, a filler such as CaCO3 and coal, AE water reducing agent, a high-performance water reducing agent, a curing accelerator or a retardant, etc., are mixed.