The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1982
Filed:
Mar. 18, 1980
Toshio Kawano, Ichihara, JP;
Shiro Ishii, Zushi, JP;
Onoda Cement Company, Ltd., Onoda, JP;
Abstract
The present demolition agent for brittle materials is prepared by pulverizing a clinker which is obtained by mixing a calcareous material, a siliceous material and gypsum at the molar ratio of CaO/SiO.sub.2 =5.0-14.4 and CaSO.sub.4 /SiO.sub.2 =0.13-1.19 and burning the mixture under an oxidizing atmosphere to 1350.degree.-1550.degree. C. The main components of the clinker thus obtained consist of 24-65% by weight of 3CaO. SiO.sub.2 crystals, 30-60% by weight of CaO crystalline particles and 5-17% by weight of CaSO.sub.4, wherein more than 50% by weight of said CaO crystalline particles is included in the large 3CaO.SiO.sub.2 crystals grown. The present demolition agent is used to break brittle materials by means of the expansive stress of aqueous slurry of the demolition agent poured into the hole of the brittle materials.