Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1973-12-17
1978-08-22
Anderson, Harold D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
106 92, 106 95, 260 13, 260 17R, 260 22CB, 260 22R, 260 22A, 260 294R, 260 297S, C08L 3102
Patent
active
041088131
ABSTRACT:
A cementitious composition suitable for spray application in formation of a dense floor structure. The composition has a Brookfield viscosity of about 2,000 to about 5,000 centipoises (cps) as measured at 20 rpm with a number 3 spindle and contains about 58 to about 70 percent by weight of a mixture of intermeshing particles of substantially spherical quartz sand. The intermeshing particles of substantially spherical quartz sand are composed of a weight fraction of relatively large size particles and a weight fraction of relatively small size particles with the weight ratio of the larger particles to the smaller particles ranging from about 3:1 to about 1:1 and an average diameter ratio of the larger particles with respect to the smaller particles ranging from about 2:1 to about 3:1. Additionally, the composition has a low water-to-cement ratio of about 0.4 to about 0.5 and contains a plastic-in-water emulsion composed of minute spherical plastic particles which intermesh with the particles of substantially spherical quartz to provide a dense floor structure having a low content of voids. The emulsion has a solids content of about 20 percent to about 50 percent by weight 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 hour and about 6 hours.
A method for forming a relatively dense cementitious floor structure which has a relatively low percentage of voids and very little shrinkage during curing, which comprises spraying the above described composition through a nozzle onto a generally horizontal supporting surface.
REFERENCES:
patent: 2311233 (1943-02-01), Jaenicke et al.
patent: 3196122 (1965-07-01), Evans
patent: 3382139 (1968-05-01), Popkin et al.
patent: 3547853 (1970-12-01), Kalandiak
Cols. 35-36 of USP 3306875.
Anderson Harold D.
Jones Thomas H.
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