Methods of stowing cavities with flowable materials
AssigneeCoal Industry (Patents) Limited
InventorsWilliam H. Kellet, Peter S. Mills
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Abstract
A quick setting cementitious composition with good early strength characteristics contains, by volume, 1-30% of a cement mixture including Portland Cement, calcium aluminate and calcium sulphate, 0.001-5% of clay and water in excess of 65%. The composition is especially suited for filling cavities in underground mines, for the construction of roadside packs, and the various components of the composition can be separately pumped or otherwise conveyed to the cavity.
Claims27
A method of stowing or filling a cavity with a flowable cementitious cavity filling medium, comprising filling the cavity with a flowable cavity filling medium wherein the medium comprises, by volume, cement mixture 1-30%, 0.001-5% of at least one clay selected from the group consisting of hectorite, bentonite, smectite and kaolinite clays and water in excess of 65%, the cement mixture comprising Portland Cement and, based on the weight of Portland Cement, 10-75% of a mixture of calcium aluminate and calcium sulphate, 0.5-15% of at least one inorganic salt accelerator and 0.005-3% of an organic or inorganic setting retarder and permitting the medium to harden in situ to form a supportive mass.
A hardenable cementitious cavity filling medium comprising by volume, 1-30% cement mixture, 0.001-5% of at least one clay selected from the group consisting of hectorite, bentonite, smectite and kaolinite clays and water in excess of 65%, the cement mixture comprising Portland Cement and, based on the weight of Portland Cement, 10-75% of a mixture of calcium aluminate and calcium sulphate, 0.5-15% of at least one inorganic salt accelerator and 0.005-3% of an organic or inorganic setting retarder.
Dependencies are inferred from the claim text.