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US 4,316,583 AGranted
Demolition agent for brittle materials
AssigneeOnoda Cement Co., Ltd.
InventorsToshio Kawano, Shiro Ishii
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AssigneeOnoda Cement Co., Ltd.
InventorsToshio Kawano, Shiro Ishii
Estimating the term…
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.
In a method for demolition which breaks brittle materials by means of the expansive stress generated by the hydration of a demolition agent, the improvement comprising pouring into a hole drilled in the brittle material an aqueous slurry of a demolition agent of pulverized clinker consisting essentially 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 are included in said 3CaO.SiO.sub.2 crystals.
Dependencies are inferred from the claim text.