Abstract A method of producing concrete includes admixing with dry cement the amount of water for producing complete setting, thoroughly beating the cement and water, and adding substantially dry sand or aggregate. The water-cement mixture is usually too stiff to be workable, but is reduced by the beating action to a less viscous product, capable when aggregate is added thereto of being blown into a reinforcing material such as a wire screen and of penetrating through the screen into contact with a backing. The amount of water is preferably of the order 35 - 37 lbs. per 100 lbs. of cement. The equipment for carrying out the spraying may be such that compressed air alone is used to provide the power for stirring and to transport the material.
A process as claimed in claim 1, in which the proportion of water to cement is substantially 35-37 lbs. of water per 100 lbs. of cement.
Claim 2
Dependent Claim
42 words
A process as claimed in claim 1, in which said aggregate material and reduced-viscosity slurry are fed through a mixing nozzle, at least the aggregate material being propelled into and through said mixing nozzle by a carrying current of air under pressure.
Claim 3
Dependent Claim
42 words
A process as claimed in claim 3, in which the aggregate material-cement mixture from said nozzle is sprayed onto a backing surface with meshed reinforcing material secured with meshed reinforcing material secured on the face thereof on which the mixture is sprayed.