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.

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.