Back to results
US 4,354,877 AGranted
Demolition agent, its preparation and its use
AssigneeOnoda Cement Co., Ltd.
InventorsToshio Kawano, Shiro Ishii, Koichi Soeda, Jyunichiro Migita
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeOnoda Cement Co., Ltd.
InventorsToshio Kawano, Shiro Ishii, Koichi Soeda, Jyunichiro Migita
Estimating the term…
A demolition agent which acts by means of expansive stress generated upon hydration and which is prepared by calcining limestone at 1300.degree. to 1600.degree. C. to produce a hard-burned quick lime whose crystal sizes are 10 to 100 micron, pulverizing the resulting hard-burned quick lime to 1500 to 5000 cm.sup.2 /g (Blaine), mixing 5 to 70 parts by weight of a hydraulic material to 30 to 95 parts by weight of the hard-burned quick lime and furthermore adding 0.1 to 5 parts by weight of an admixture comprising a water reducing agent to 100 parts by weight of the mixture of the powdery hard-burned quick lime and the hydraulic material. The demolition agent is used as an aqueous slurry. The slurry is filled into holes of a brittle material to demolish the brittle material by means of expansive stress generated upon hydration.
A method of demolition of a brittle material in which one or more holes are drilled in the brittle material, and the holes are filled with an aqueous slurry of a demolition agent which acts by generating expansive stress upon hydration, characterized in that the demolition agent comprises a powdery material of 30 to 95 parts by weight of a powdery hard-burned quick lime whose crystal sizes are 10 to 100 microns, 5 to 70 parts by weight of a hydraulic material and 0.1 to 5 parts by weight of an admixture comprising a water reducing agent to 100 parts by weight of said mixture of the powdery hard-burned quick lime and the hydraulic material.
Dependencies are inferred from the claim text.