초록 ▼

A method and composition for grouting a water-flooded cavity. Water and portland cement are combined to form a fluid cement slurry, the slurry being substantially free of sand or other aggregate material, and the slurry is then colloidally mixed so as to achieve an ultra-fine mixing thereof. An anti

A method and composition for grouting a water-flooded cavity. Water and portland cement are combined to form a fluid cement slurry, the slurry being substantially free of sand or other aggregate material, and the slurry is then colloidally mixed so as to achieve an ultra-fine mixing thereof. An anti-washout admixture is mixed with the slurry in a predetermined amount, and a superplasticizing agent is also preferably included, both the anti-washout admixture and the superplasticizer agent being substantially free of defoaming agents. Finished foam is then mixed with the slurry to form a stable foamed cement grout which is injected into the water-flooded cavity. The anti-washout admixture is preferably a modified cellulose ether solution.

대표청구항 ▼

[ What is claimed is:] [1.] A method for grouting a water-flooded cavity, said method comprising the steps of:combining hydraulic cement and water in predetermined amounts so as to form a fluid cement slurry, said cement slurry being substantially free of sand or other aggregate material;colloidally

[ What is claimed is:] [1.] A method for grouting a water-flooded cavity, said method comprising the steps of:combining hydraulic cement and water in predetermined amounts so as to form a fluid cement slurry, said cement slurry being substantially free of sand or other aggregate material;colloidally mixing said cement slurry so as to achieve ultra-fine mixing thereof;mixing an anti-washout admixture with said cement slurry in a predetermined amount, said anti-washout admixture being substantially free of defoaming agents;mixing finished foam with said slurry after said slurry has been colloidally mixed and after said anti-washout admixture has been mixed with said slurry, so as to form a stable foamed cement grout; andinjecting said foamed cement grout into said water-flooded cavity.