Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1973-12-17
1976-05-11
Poer, J.
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 92, 106 93, 106 95, 106 98, 260 296S, C04B 702, C04B 935
Patent
active
039559920
ABSTRACT:
A cementitious composition suitable for spray application in formation of a dense wall structure. The composition has a Brookfield viscosity of about 4,000 to about 9,000 centipoises (cps) as measured at 20 rpm with a number 3 spindle and contains about 50 to about 65 percent by weight of substantially spherical quartz sand having an average particle size of about 87 mesh to about 20 mesh. In addition, the composition has a low water-to-cement ratio in the range of about 0.3 to about 0.5, and contains a plastic-in-water emulsion composed of minute spherical plastic particles which intermesh with the spherical quartz to provide a dense wall structure having a low void content. The emulsion has a solids content of about 20 percent to about 50 percent by weight of the emulsion and, in addition, the composition contains a flow control material, such as a high molecular weight poly(ethylene oxide), and optionally a gel retarder. The flow control material is present in an amount sufficient to provide the composition with laminar flow properties during spraying while the gel retarder may be present in an amount sufficient to provide a gel time between about 1 and about 6 hours.
A method for forming a relatively dense cementitious wall which has a low percentage of voids and very little shrinkage during curing which comprises spraying the above described composition through a nozzle onto a substantially vertical supporting surface.
REFERENCES:
patent: 2868753 (1959-01-01), Morgan et al.
patent: 3759729 (1973-09-01), Fahn
patent: 3853577 (1974-12-01), Nishida et al.
Poer J.
Smyth George F.
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