US 5,494,708 AGranted

Method and apparatus for mixing, spraying and placing cementitious materials

AssigneeBlue Oak Materials Limited Partnership

InventorHenry L. Chess, Jr.

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Abstract

There is provided an improved composition for rapid setting, sprayable cementitious material, as well as improved processes and systems for mixing and placing such materials. The composition comprises a sprayable mixture of cement forming ingredients, such as silicon dioxide, magnesium oxide, and an aqueous metal phosphate solution. The process for mixing and placing such a composition uses serially connected dry material feed receptacles which are independently pressurizable and are isolatable from ambient conditions after loading to provide substantially increased throughput volume. The receptacles communicate the composition to a fluidizing element in which the material is fluidized before being formed into a slurry and atomized. Alternatively, dry and slurried material can be conveyed in a cavity pump under high pressure to achieve substantially increased throughput volume.

Claims11

Dependent claims

A continuous process for making a sprayable, rapid setting cementitious material, comprising the steps of:

a) adding a dry component to a first receptacle in fluidic communication with and disposed upstream of a second receptacle, the first receptacle being isolated from the second receptacle during addition of the dry component to the first receptacle;
b) isolating the first receptacle from ambient conditions forming a closed system;
c) allowing the first and second receptacles to reach a substantially uniform pressure by introduction of a pressurized gas to each of the first and second receptacles;
d) permitting the dry component to transfer from the first receptacle to the second receptacle when the first and second receptacles are at substantially equal pressures;
e) continuously delivering the dry component into a fluidizing element in communication with the second receptacle in which the dry component is fluidized within a pressurized gas stream;
f) forming a slurry by introducing to the fluidized dry component an aqueous phosphate solution;
and
g) mixing and atomizing the slurry to obtain a sprayable, rapid setting cementitious material in the form of an atomized material.

5 more elements

Dependencies are inferred from the claim text.