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.

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.