| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength concrete or the like, which is produced easily and inexpensive, by ferromagnetizing a weak magnetic natural stone, the high strength concrete enhancing earthquake resistance of architectural structures and constructions to increase a disaster prevention function in a safe and secure society and also remarkably contributing to resource saving, energy saving and CO2 emission reduction.SOLUTION: A weak magnetic natural stone can be changed into a ferromagnetic stone by a heating method of the present invention. According to the present invention, a weak magnetic crushed stone conventionally used for a concrete coarse aggregate can be ferromagnetized, and a high strength concrete can be produced inexpensively. |
