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US 4,419,135 AGranted
Method of preparing cementitious compositions for tunnel backfill
AssigneeMolecrete Corporation
InventorJohn H. Hoge
Life of this patent
Estimating the term…
Abstract
A cementitious composition for backfilling and sealing tunnels and other underground structures comprising 12-16 parts sand, 3-6 parts cement, 1.5-3 parts water, 0.1-0.5 parts plasticizer and 0.02-0.04 parts of a pituitous water soluble polyethylene oxide thickening agent.
Claims28
A method for preparing a highly flowable cohesive sealing grout for backfilling tunnels and similar underground structures comprising the steps of:
- (a) charging a mixing means with 6 to 8 parts by weight of sand;
- (b) adding to said sand 11/2 to 3 parts by weight of water and 3 to 6 parts by weight of cement while maintaining the mixing agitation to form a grout;
- (c) adding to said grout 0.01 to 0.05 parts by weight of a plasticizing agent selected from the class of water soluble metal salts consisting of the condensation products of an aldehyde and an aromatic sulfonic acid to form a plasticized grout;
- (d) maintaining said plasticized grout in a state of agitation while adding concurrently 6 to 8 parts of sand and 0.02 to 0.04 parts by weight of a pituitous water soluble polyethylene oxide thickening compund having a molecular weight of about 2 million to about 7 million;
- (e) agitating said plasticized grout for a period of time that will insure uniform dispersion of all ingredients;
- and
- (f) discharging said grout into means for placing it promptly at the desired point of use.
4 more elements
A cementitious composition for backfilling and sealing tunnels, tunnel liners and similar underground structures comprising:
- (a) 12 to 16 parts of sand;
- (b) 3 to 6 parts by weight of cement;
- (c) between 11/2 to 3 parts by weight of water;
- (d) between 0.10 to 0.05 parts by weight of a plasticizing agent selected from the class of water soluble metal salts and the condensation product of an aldehyde and an aromatic sulfonic acid;
- and
- (e) between 0.02 to 0.04 parts by weight of a pituitous water soluble polyethylene oxide thickening compound having a molecular weight of about 2 million to about 7 million.
3 more elements
Dependencies are inferred from the claim text.