CONCRETE HAVING PROPERTY CHANGEABLE BY MAGNETISM

PROBLEM TO BE SOLVED: To enhance the strength and durability of a reinforced concrete by a method wherein a magnet, which can magnetize magnetic bodies, is mounted inside and outside a concrete, in at least some part of aggregates of which the magnetic bodies are included and which is not yet solidified, and fixed or moved. SOLUTION: A magnetic material-added concrete, some part of the fine or coarse aggregates of which consists of ores including slugs and iron sand, metals, artificial magnetic materials and their composite materials, is put in a container. When a magnet 5 is externally contactedly fixed to the container, the magnetic aggregates are magnetized and applied with a force attracting to the magnet 5, resulting in compressing a viscous concrete 1 between the magnetic aggregates and the container, consequently enheightening the viscosity of the concrete and densely collecting some part near the magnet 5 of the magnetic aggregates around the magnet 5. On the other hand, t through the movement and stoppage of the magnet 5, a flowing force, the direction of which is varied, is given to a magnetized concrete. When the magnet 5 is vibrated, the concrete, which is not yet solidified, vibrates together with the magnetic aggregates, resulting in dispersing the air within the concrete and acting so as to prevent accumulated bubbles from generating between the inner surface of the container and the concrete.