Processed mineral additive for reducing concrete permeability and increasing strength
First Claim
1. A concrete additive comprising:
- a flowable powder comprising ground expanded perlite with a volume weighted mean particle size of approximately 10-100 μ
m and a moisture content of 10 to 50% by weight.
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Accused Products
Abstract
A concrete additive includes expanded perlite with a volume weighted mean particle size of approximately 10-100 μm. The perlite further includes at least one additional component to improve workability and compensate for the natural tendency of expanded perlite to absorb water from the concrete mix. The additional component can include: water; a superplasticizer such as polycarboxylates, naphthalene sulfonate, and melamine sulfonate; or a hydrophobic compound such as salts of fatty acids, fatty acids, silanes, and siloxanes. The additive can be made in the form of a flowable powder or a flowable slurry. Concrete containing this additive displays superior properties to conventional concrete, including extremely high thermal resistance and high strength, low chloride ion permeability, and good early strength. The expanded perlite is a readily available raw material and the finished concrete is extremely cost effective for applications where a high strength structural concrete must withstand high temperatures.
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Citations
12 Claims
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1. A concrete additive comprising:
a flowable powder comprising ground expanded perlite with a volume weighted mean particle size of approximately 10-100 μ
m and a moisture content of 10 to 50% by weight.- View Dependent Claims (2, 3, 4, 5)
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6. A concrete additive comprising:
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a flowable powder comprising ground expanded perlite with a volume weighted mean particle size of approximately 10-100 μ
m, and,a hydrophobic compound applied to at least part of the accessible surface area of said expanded perlite. - View Dependent Claims (7, 8, 9)
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10. A concrete additive comprising:
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a flowable powder comprising ground expanded perlite with a volume weighted mean particle size of approximately 10-100 μ
m, and,at least one additional component selected from the group consisting of; water in an amount of 10 to 50% by weight; superplasticizer in an amount of about 0.025 to 0.8% on a solids basis; and
,a hydrophobic compound applied to at least part of the accessible surface area of said ground expanded perlite. - View Dependent Claims (11)
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12. A concrete additive comprising:
a flowable slurry comprising ground expanded perlite with a volume weighted mean particle size of approximately 10-100 μ
m and a water content of at least five times that of said perlite by weight.
Specification