Lightweight concrete roof tiles
AssigneeBoral Concrete Products, Inc.
InventorsHarvey R. Dunton, Francis C. Petersen
Life of this patent
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Abstract
Lightweight concrete roof tiles are produced by extruding a latex/cement/lightweight aggregates/water mix in a prescribed sequence. The composition comprises: (a) 45-65 parts by weight of an acrylic latex emulsion; (b) 130-180 parts by weight of a cement; (c) 360-400 parts by weight of expanded shale lightweight aggregates; and (d) 50-75 parts by weight of additional water. This lightweight concrete roof tile of the present invention is about half the weight and about the same strength, and absorbs the same amount of water of conventional roof tiles.
Claims13
A composition useful for fabricating lightweight concrete roof tiles consisting essentially of:
- (a) 45-65 parts by weight of an acrylic latex emulsion;
- (b) 130-180 parts by weight of a cement;
- (c) 360-400 parts by weight of a lightweight aggregate;
- and
- (d) 50-75 parts by weight of water.
A composition useful for fabricating lightweight concrete roof tiles consisting essentially of:
- (a) 55 parts by weight of a butyl acrylate, methacrylate and methylacrylic acid polymer latex emulsion;
- wherein said polymer latex emulsion consists essentially of 45-47% of solid polymer by weight;
- (b) 20 parts by weight of a Type I Portland cement;
- (c) 380 parts by weight of an expanded shale lightweight aggregate;
- and
- (d) 65 parts by weight of water.
Dependencies are inferred from the claim text.