Lightweight cementitious compositions and building products and methods for making same
First Claim
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1. A cement board having a density of about 45 to 85 pounds per cubic foot (0.72 to 1.36 g/cc), and having a continuous phase resulting from the curing of an aqueous mixture comprising:
- 35-60 parts by weight Portland cement-based binder,2-10 parts by weight expanded and coated perlite filler having a mean particle diameter of about 20 to 90 microns,10-50 volume % entrained air, andoptional additives selected from one or more members of the group consisting of water reducing agents, set-accelerators, set-retarders; and
0-25 parts by weight secondary filler, wherein the secondary filler is at least one of blast furnace slag, volcanic tuff, expanded clay, shale aggregate, hollow ceramic spheres, hollow plastic spheres, expanded plastic beads and pumice.
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Abstract
Cementitious compositions and methods for making same, in which the cementitious compositions include 35-60 wt. % cementitious reactive powder (also termed Portland cement-based binder), 2-10 wt. % expanded and chemically coated perlite filler, 20-40 wt. % water, entrained air, and optional additives such as water reducing agents, chemical set-accelerators, and chemical set-retarders. In addition, the lightweight cementitious compositions may contain 0-25 wt. % on a wet basis secondary fillers such as expanded clay, shale aggregate, and pumice.
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Citations
18 Claims
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1. A cement board having a density of about 45 to 85 pounds per cubic foot (0.72 to 1.36 g/cc), and having a continuous phase resulting from the curing of an aqueous mixture comprising:
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35-60 parts by weight Portland cement-based binder, 2-10 parts by weight expanded and coated perlite filler having a mean particle diameter of about 20 to 90 microns, 10-50 volume % entrained air, and optional additives selected from one or more members of the group consisting of water reducing agents, set-accelerators, set-retarders; and 0-25 parts by weight secondary filler, wherein the secondary filler is at least one of blast furnace slag, volcanic tuff, expanded clay, shale aggregate, hollow ceramic spheres, hollow plastic spheres, expanded plastic beads and pumice. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification