Accelerating agents for accelerating hardening of cement
First Claim
1. A method of at least partially filling a cavity in an underground mine which method comprises the steps of(a) where required, defining said cavity using shuttering,(b) charging to said cavity a first aqueous slurry containing a hydraulic cement and concurrently charging and mixing with said first aqueous slurry a second aqueous slurry containing an agent for accelerating hardening of the hydraulic cement and(c) permitting the mixed slurries to harden into a supportive concrete-like material in the cavity.
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Accused Products
Abstract
An agent for accelerating hardening of cement for use in an underground mining installation employing concrete-like packs including run-of-mine coal. The agent comprises by weight one and a half parts triethanolamine, five parts sodium carbonate and one part potassium carbonate. Too rapid setting of quick setting cement is avoided by the agent because a slurry of cement in water is mixed with a slurry of agent and run-of-mine coal in bentonite in a mixer immediately before being added to a pack so that setting cement does not occur in pipes leading to the mixer.
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Citations
7 Claims
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1. A method of at least partially filling a cavity in an underground mine which method comprises the steps of
(a) where required, defining said cavity using shuttering, (b) charging to said cavity a first aqueous slurry containing a hydraulic cement and concurrently charging and mixing with said first aqueous slurry a second aqueous slurry containing an agent for accelerating hardening of the hydraulic cement and (c) permitting the mixed slurries to harden into a supportive concrete-like material in the cavity.
Specification