US5487307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for testing concrete expansion
Assignee: Kalman Floor Co Inc
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Filing: 1994-02-10
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Granted: 1996-01-30
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Expires: 2014-02-10
Abstract
Abstract A method and apparatus is disclosed for measuring on-site expansive volumetric changes in hardened, shrinkage-compensated concrete samples. The sample is disposed in a cylindrical container having a strain gauge for measuring hoop stress which is correlated with expansion of the sample.
Inventors
- 👤 Robert Landgren
- 👤 William F. Perenchio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; G01B; G01B7/00; G01B7/16
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
Apparatus for measuring volumetric changes in hardenable samples comprising: a steel container having an open top and an uninterrupted upstanding sidewall for receiving and containing a hardenable sample therein in intimate and direct contact with an inner surface of said sidewall; and strain gauge means secured to the sidewall of the container and being disposed for sensing expansive changes in said sidewall in response to volumetric changes in the sample upon hardening and being operable when energized to produce a signal indicative of such volumetric changes in the sample.
Claim 2
Dependent Claim
89 words
Apparatus for measuring volumetric changes in hardenable samples comprising: a steel container having an open top and an uninterrupted upstanding sidewall for receiving and containing a hardenable sample therein in intimate and direct contact with an inner surface of said sidewall; and strain gauge means secured to the sidewall of the container and being disposed for sensing expansive changes in said sidewall in response to volumetric changes in the sample upon hardening and being operable when energized to produce a signal indicative of such volumetric changes in the sample.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 wherein the strain gauge means comprises a resistive element in which resistance changes with length.
Claim 4
Dependent Claim
19 words
The apparatus of claim 1 further including bridge circuit means coupled to resistor elements of the strain gauge means.
Claim 5
Dependent Claim
35 words
The apparatus of claim 1 further comprising metering means coupled to the strain gauge means for producing an output corresponding to the strain of the strain gauge means resulting from volumetric changes in the sample.
Claim 6
Dependent Claim
20 words
The apparatus of claim 1 further comprising means for recording the signal indicative of volumetric changes in the hardenable sample.
Claim 7
Dependent Claim
24 words
The apparatus of claim 5 wherein the means for recording comprises at least one of an electronic memory, data logger and a pen recorder.
Claim 8
Dependent Claim
45 words
The apparatus of claim 5, the strain gauge means comprising a plurality of strain gauges, and further comprising switch means coupled to the plurality of strain gauges and to the means for recording for selectively coupling data from multiple samples to said means for recording.
Claim 9
Dependent Claim
13 words
The apparatus of claim 1 wherein the cylinder is about 26 gauge steel.
Claim 10
Dependent Claim
22 words
The apparatus of claim 1 wherein the sample has a maximum coarse aggregate size of about 1/3 the diameter of the cylinder.
Claim 11
Dependent Claim
18 words
The apparatus of claim 1 wherein the sample has a maximum coarse aggregate size of at least 2".
Claim 12
Dependent Claim
18 words
The apparatus of claim 1 wherein the sample has an expansion in a range of 0.02% and 0.1%.
Claim 13
Dependent Claim
19 words
The apparatus of claim 1 wherein the sample has an expansion in a range of about 0.03% and 0.07%.
Claim 14
Dependent Claim
36 words
The apparatus of claim 1 further including a second container and strain gauge coupled in a bridge configuration with the means strain gauge means for recording a temperature compensating sample for comparison with the hardenable sample.
Claim 15
Dependent Claim
12 words
The apparatus of claim 1 wherein the sample is shrinkage compensated concrete.
Claim 16
Dependent Claim
17 words
The apparatus of claim 1, wherein the container has a closed bottom wall secured to the sidewall.
Claim 17
Independent Claim
81 words
A method for measuring volumetric changes in curable samples comprising the steps of: disposing a sample of curable material into intimate and direct contact with an inner surface of a steel container having an open top and an uninterrupted upstanding cylindrical sidewall, securing a strain gauge to said sidewall to sense expansive changes of the sidewall in response to volumetric changes in the sample; and recording on-site volumetric changes in the sample in accordance with the changes in the strain gauge.
Claim 18
Independent Claim
81 words
A method for measuring volumetric changes in curable samples comprising the steps of: disposing a sample of curable material into intimate and direct contact with an inner surface of a steel container having an open top and an uninterrupted upstanding cylindrical sidewall, securing a strain gauge to said sidewall to sense expansive changes of the sidewall in response to volumetric changes in the sample; and recording on-site volumetric changes in the sample in accordance with the changes in the strain gauge.
Claim 19
Dependent Claim
17 words
The method of claim 16, wherein the container has a closed bottom wall secured to the sidewall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-29 | 1999-07-31 | 2000-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-29 | 2003-07-31 | 2004-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-29 | 2007-07-31 | 2008-01-30 | $7700.00 | Window Closed / Lapsed |