US5456751A
Expired / Lapsed
US
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Particulate rubber included concrete compositions
Assignee: University of Pennsylvania
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Filing: 1994-11-14
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Granted: 1995-10-10
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Expires: 2014-11-14
Abstract
Abstract Concrete compositions are provided which contain particulate rubber, preferably recycled rubber from such sources as automobile tires, in amounts between about 0.05 and about 20 percent by weight of the concrete composition. The concrete compositions further contain portland cement, water, and an aggregate material. Additional materials such as superplasticizers and fly ash can also be admixed with the concrete compositions.
Inventors
- 👤 Iraj Zandi
- 👤 John Lepore
- 👤 Hossein Rostami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:11
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; C04B18/00; C04B18/04; C04B18/18; C04B18/20; C04B18/22; C04B2201/00; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
67 words
A concrete composition comprising portland cement and particulate rubber, said rubber being present in an amount between about 0.05 and about 20 weight percent of the concrete composition; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve.
Claim 2
Dependent Claim
67 words
A concrete composition comprising portland cement and particulate rubber, said rubber being present in an amount between about 0.05 and about 20 weight percent of the concrete composition; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve.
Claim 3
Dependent Claim
48 words
The composition of claim 1 wherein the particle size distribution of the particulate rubber is such that from 0-30 weight percent of the rubber particles pass through a No. 8 sieve and less than 10 weight percent of the rubber particles are retained on a 0.5 inch sieve.
Claim 4
Dependent Claim
26 words
The composition of claim 2 wherein the portland cement is present in an amount of from about 5 to about 20 weight percent of the composition.
Claim 5
Dependent Claim
21 words
The composition of claim 2 further comprising fly ash in an amount up to about 6 weight percent of the composition.
Claim 6
Dependent Claim
20 words
The composition of claim 2 further comprising superplasticizer in an amount up to about 2 weight percent of the composition.
Claim 7
Dependent Claim
43 words
The composition of claim 2 wherein the portland cement is present in an amount of from about 5 to about 20 weight percent, and the rubber is present in an amount of from about 0.05 to about 15 weight percent, of the composition.
Claim 8
Dependent Claim
21 words
The composition of claim 6 further comprising fly ash in an amount up to about 3 weight percent of the composition.
Claim 9
Dependent Claim
20 words
The composition of claim 6 further comprising superplasticizer in an amount up to about 0.5 weight percent of the composition.
Claim 10
Dependent Claim
17 words
The composition of claim 6 wherein the rubber comprises a cis-1,4-polyisoprene, a polybutadiene or a styrene-butadiene rubber.
Claim 11
Dependent Claim
53 words
The composition of claim 9 wherein the particle size distribution of the rubber is further defined such that 55-75 weight percent of the rubber particles pass through a 3/8 inch sieve, from 25-45 weight percent pass through a No. 4 sieve, and from about 0-10 weight percent pass through a No. 8 sieve.
Claim 12
Dependent Claim
43 words
The composition of claim 10 wherein the portland cement is present in an amount of from about 5 to about 20 weight percent, and the rubber is present in an amount of from about 0.1 to about 5 weight percent of the composition.
Claim 13
Dependent Claim
23 words
The composition of claim 11 further comprising sand in an amount of from about 10 to about 40 weight percent of the composition.
Claim 14
Dependent Claim
23 words
The composition of claim 11 further comprising stone in an amount of from about 15 to about 40 weight percent of the composition.
Claim 15
Dependent Claim
23 words
The composition of claim 11 further comprising water in an amount of from about 4 to about 10 weight percent of the composition.
Claim 16
Dependent Claim
66 words
A cured concrete composite comprising portland cement and particulate rubber, said rubber being present in an amount between 0.05 to about 20 weight percent of the composite; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve.
Claim 17
Dependent Claim
66 words
A cured concrete composite comprising portland cement and particulate rubber, said rubber being present in an amount between 0.05 to about 20 weight percent of the composite; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve.
Claim 18
Dependent Claim
53 words
The composite of claim 15 wherein the particle size distribution of the rubber is further defined such that 55-75 weight percent of the rubber particles pass through a 3/8 inch sieve, from 25-45 weight percent pass through a No. 4 sieve, and from about 0-10 weight percent pass through a No. 8 sieve.
Claim 19
Dependent Claim
43 words
The composition of claim 16 wherein the portland cement is present in an amount of from about 5 to about 20 weight percent, and the rubber is present in an amount of from about 0.1 to about 5 weight percent of the composite.
Claim 20
Dependent Claim
20 words
The composite of claim 17 further comprising superplasticizer in an amount up to about 2 weight percent of the composition.
Claim 21
Dependent Claim
15 words
The composite of claim 18 having a compression strength of at least about 3500 psi.
Claim 22
Dependent Claim
132 words
A concrete composition comprising: (a) binder for concrete consisting essentially of portland cement; (b) particulate rubber, said rubber being present in an amount between about 0.05 and about 20 weight percent of the concrete composition; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve; and (c) sand present in an amount between about 10 and about 40 weight percent of the concrete composition; said sand having a particle size distribution such that from about 70-90 weight percent of the sand particles pass through a No. 30 sieve and about 92-100 weight percent of the sand particles pass through a No. 16 sieve.
Claim 23
Dependent Claim
132 words
A concrete composition comprising: (a) binder for concrete consisting essentially of portland cement; (b) particulate rubber, said rubber being present in an amount between about 0.05 and about 20 weight percent of the concrete composition; said rubber having a particle size distribution such that from about 50-95 weight percent of the rubber particles pass through a 3/8 inch sieve and about 20-75 weight percent of the rubber particles pass through a No. 4 sieve; and (c) sand present in an amount between about 10 and about 40 weight percent of the concrete composition; said sand having a particle size distribution such that from about 70-90 weight percent of the sand particles pass through a No. 30 sieve and about 92-100 weight percent of the sand particles pass through a No. 16 sieve.
Claim 24
Dependent Claim
15 words
The composite of claim 15 having a compression strength of at least about 3500 psi.
Claim 25
Dependent Claim
15 words
The composite of claim 16 having a compression strength of at least about 3500 psi.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |