| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain light-weight electromagnetic shielding mortar and concrete which impart electromagnetic shielding function to a wall, a slab and interior material of a building. SOLUTION: Mortal materials 5 and 6 or concrete materials 5, 6 and 7 are mixed and kneaded with iron oxide 4 and carbon 8, having a volume of which a transmission ratio T per unit thickness corresponding to a electromagnetic wave to be shielded is less than a prescribed level T0, and the specific gravity after solidation is made less than the specific gravity at the solidification of the mortal material or the concrete material. Preferably, light-weight electromagnetic shielding mortal 1 is made by the iron oxide 4 and the carbon 8 of 50 to 300 weight % and water 6 of 30 to 70 weight % with respect to the cement 5 which is mixed and kneaded, and electromagnetic shielding concrete 2 is made by the iron oxide 4 and the carbon 8 of 50 to 500 weight %, fine aggregate and rough aggregate of 30 to 500 weight % and water 6 of 30 to 70 weight % being mixed and kneaded with respect to the cement 5. It is more preferable that a mixed powder 9 of the iron oxide 4 and the carbon 8 be made, and blast furnace second ash and the like generated at a steel making step be used.</p> |
