Foamed cementitious compositions and method of producing same
First Claim
1. A low density cementitious foamed composition comprising 100 parts by weight of a mineral cement;
- about 10-50 parts by weight of a filler, selected from the group consisting of an exfoliated lightweight aggregate and hollow silicate spheres;
about 1-20 parts by weight of an organic, water-soluble film former selected from the group consisting of guar gum, pregelatinized starch, xanthan gum, and protein colloids;
about 0.1-3.0 parts by weight of surface active foaming agents; and
at least about 8% by volume, based on the total volume of said components, of air, said cementitious composition having been processed with from about 30 to about 150 parts by weight of water.
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Abstract
A cellular product useful for such purposes as fire resistance, thermal insulation, and acoustical sound proofing may be produced from a mineral cement, such as gypsum cement, portland cement, calcium aluminate cement, or magneisa cement, an organic film former such as guar gun, or an inorganic film former such as bentonite, a mixture of nonionic and anionic surfactants, a lightweight aggregate, such as perlite, vermiculite, or hollow silicate spheres, and air in amount substantially in excess of that used in air entrainment of cement, whereby the product has a density which is only a small fraction of the density of the mineral cement and aggregate composition per se.
144 Citations
7 Claims
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1. A low density cementitious foamed composition comprising 100 parts by weight of a mineral cement;
- about 10-50 parts by weight of a filler, selected from the group consisting of an exfoliated lightweight aggregate and hollow silicate spheres;
about 1-20 parts by weight of an organic, water-soluble film former selected from the group consisting of guar gum, pregelatinized starch, xanthan gum, and protein colloids;
about 0.1-3.0 parts by weight of surface active foaming agents; and
at least about 8% by volume, based on the total volume of said components, of air, said cementitious composition having been processed with from about 30 to about 150 parts by weight of water. - View Dependent Claims (2, 3, 4, 5)
- about 10-50 parts by weight of a filler, selected from the group consisting of an exfoliated lightweight aggregate and hollow silicate spheres;
- 6. A method for producing a foamed cementitious composition comprising the steps of mixing together about 30-150 parts of water, about 100 parts by weight of a mineral cement, up to about 50 parts by weight of a lightweight mineral aggregate or hollow silicate spheres, about 1-20 parts by weight of an organic water-soluble film former selected from the group consisting of guar gum, pregelatinized starch, xanthan gum, and protein colloids, and 0.1-3.0 parts by weight of a mixture of anionic and nonionic surface active foaming agents, stirring the resulting mixture and incorporation air therein in an amount of at least 8 percent by volume based on the volume of the final foamed composition.
Specification