Roofing shingle composition, method of formulation, and structure
First Claim
1. An aqueous admixture extrudible to produce lightweight cementitious roofing shingles, that consists essentially of the components:
- a) expanded perlite in particulate form,b) an ingredient or ingredients selected from the group consisting of pumice expanded shale and clay, said ingredient or ingredients being in particulate form, and initially completely water saturated, using 0.2 to 0.3 parts by weight of water,c) Portland cement in particulate form,d) said components being present in relative weight amounts;
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Accused Products
Abstract
A formula of lightweight aggregates, fiber, and Portland Cement, which, when graded, prepared and mixed as described produces a lightweight, fire and thermal resistive concrete which can be successfully and easily extruded into shapes for use in construction, principally, roofing tiles, shingles and shakes. This mix can also be pressed into the same shapes and brick and block shapes. The resultant compressed product is homogeneous and uniform thus creating superior strength characteristics. This "concrete" is approximately half the weight of traditional concrete (specific weight is 0.85 to 1.0, or expressed in metric, 0.85 gr. per cc.) and is greater than half as strong and absorbs the same amount of water.
118 Citations
12 Claims
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1. An aqueous admixture extrudible to produce lightweight cementitious roofing shingles, that consists essentially of the components:
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a) expanded perlite in particulate form, b) an ingredient or ingredients selected from the group consisting of pumice expanded shale and clay, said ingredient or ingredients being in particulate form, and initially completely water saturated, using 0.2 to 0.3 parts by weight of water, c) Portland cement in particulate form, d) said components being present in relative weight amounts; - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 12)
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2. 8 to 1.2 part Portland cement
0.3 to 0.4 part expanded perlite, e) said b) ingredient or ingredients having sieve analysis expressed as percent by weight retained on a succession of screens as follows: -
space="preserve" listing-type="tabular">______________________________________ Screen % by weight ______________________________________ 4 mesh 0-5 8 mesh 10-20 16 mesh 20-30 30 mesh 30-50 50 mesh 5-15 Pan 5 max. ______________________________________and wherein the b) ingredient particulate has a specific weight of 0.80 to 0.90 and a density of 40 to 60 pounds per cubic foot, f) the final admixture containing additionally added 0.4 to 0.6 parts by weight of water.
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11. The produce shingle produced from an aqueous admixture extrudible to produce lightweight cementitious roofing shingles, that consists essentially of the components:
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a) expanded perlite in particulate form, b) an ingredient or ingredients selected from the group consisting of pumice, expanded shale and clay, said ingredient or ingredients being in particulate form, and c) Portland cement in particulate form, said produce single produced by the method employing a rotary blade mixer and including the steps; i) adding ingredient c) to the mixer and operating the mixer to disperse same, ii) then adding ingredient b) to the mixer and operating the mixer with a first water portion added to produce mix homogeneity, said first water portion being between 0.2 to 0.3 parts by relative weight, iii) continuing operation of the mixer, at reduced speed, iv) adding ingredient a) and continuing mixing of the mix at a reduced mixing level and with a second portion of water added, said second water portion being between 0.4 and 0.6 parts by relative weight, v) and forming the produce shingle from said mix, and curing the shingle, d) said components being present in relative weight amounts; 0.8 to 1.2 part b) ingredient or ingredients about 1 part Portland cement 0.3 to 0.4 part expanded perlite, e) said b) ingredient or ingredients having sieve analysis expressed as percent by weight retained on a succession of screens as follows;
space="preserve" listing-type="tabular">______________________________________ Screen % by weight ______________________________________ 4 mesh 0-5 8 mesh 10-20 16 mesh 20-30 30 mesh 30-50 50 mesh 5-15 Pan 5 max. ______________________________________and wherein the b) ingredient particulate has a specific weight of 0.80 to 0.90 and a density of 40 to 60 pounds per cubic foot.
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Specification