US3861201A
Expired / Lapsed
US
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Method and apparatus for early strength testing of in-place concrete
Assignee: RICHARDS OWEN
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Filing: 1973-06-08
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Granted: 1975-01-21
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Expires: 1993-06-08
Abstract
Abstract Reduced scatter in strength determinations of hardening inhomogenous materials such as concrete is achieved by in-place screen-rejection of coarse-particle ingredients from test bodies evaluated by variations of the tensile-shear or pull-out method. Non- or semi-destructive tests on specimens or structures at any age are described in connection with construction safety, structural load-bearing capacity, evaluation of materials and systems. Use of flexible filler in the pull-out ring extends the applicability of the test system into the interior of mass structures. Portable apparatus requires no utility services.
Inventors
- 👤 Franz Kaindl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:06
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; G01N3/00; G01N2203/00; G01N2203/0058; G01N2203/0092
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
64 words
The method of testing the strength of a body comprising a setting substance, such as concrete, having a separable component such as a coarse grain aggregate affecting the accuracy of said testing, comprising the steps of, selecting in said body a test site portion, eliminating said separable component from the test site, and testing the strength of said body located within said test site.
Claim 2
Independent Claim
64 words
The method of testing the strength of a body comprising a setting substance, such as concrete, having a separable component such as a coarse grain aggregate affecting the accuracy of said testing, comprising the steps of, selecting in said body a test site portion, eliminating said separable component from the test site, and testing the strength of said body located within said test site.
Claim 3
Dependent Claim
49 words
The method defined in claim 1 wherein the separable component is eliminated at said test site by screening out coarser components at a time prior to forming said body, and said body is formed thereafter with the coarser components therein about and in contact with said test site portion.
Claim 4
Dependent Claim
31 words
The method defined in claim 1 wherein the step of eliminating said component comPrises the step of placing screens for shielding the test site to pass only finer grain components thereinto.
Claim 5
Dependent Claim
37 words
The method defined in claim 3 including the step of mounting formwork to confine materials of said body, and removably mounting said screens on said formwork for detaching prior to removal of the formwork from said body.
Claim 6
Dependent Claim
38 words
The method defined in claim 4 wherein the formwork defines openings at the test site, and including the step of mounting measuring plates at the openings as part of said framework for positioning said removably mounted screens thereon.
Claim 7
Dependent Claim
64 words
The method defined in claim 1 wherein said testing comprises the steps of mounting at the test site a disk and a counterholder with an opening larger than the disk therein spaced substantially parallel to each other, and exerting an increasing force between the disk and counterholder to break the bond between the test site and surrounding body to form thereby a truncated cone.
Claim 8
Dependent Claim
27 words
The method defined in claim 6 including the step of arranging the disk and counterholder to define an aperture angle of said cone between 55* and 90*.
Claim 9
Dependent Claim
20 words
The method defined in claim 7 including the step of limiting said angle to the range of 63* and 73*.
Claim 10
Dependent Claim
27 words
The method defined in claim 6 wherein the body presents a surface area, including the step of placing the counterholder nearer the surface area than the disk.
Claim 11
Dependent Claim
27 words
The method defined in claim 6 wherein the body presents a surface area, including the step of placing the disk nearer the surface area than the counterholder.
Claim 12
Dependent Claim
37 words
The method defined in claim 6 wherein the body presents a surface area, including the step of arranging the disk and the counterholder so that a line normal their parallel surfaces is normal to said surface area.
Claim 13
Dependent Claim
37 words
The method defined in claim 6 wherein the body presents a surface area, including the step of arranging the disk and the counterholder so that a line normal their parallel surfaces is inclined to said surface area.
Claim 14
Dependent Claim
31 words
The method defined in claim 6 wherein the body presents a surface area and the step of exerting the force comprises guiding a pull rod substantially parallel to said surface area.
Claim 15
Dependent Claim
36 words
The method defined in claim 6 wherein the body presents a surface area, comprising the step of forming a recess in said surface area, and wherein said force is exerted by means placed in said recess.
Claim 16
Dependent Claim
46 words
The method defined in claim 6 including the steps of placing formwork to define said body, attaching said disk and counterholder to said formwork prior to forming said body, and removing said disk and counterholder from said formwork prior to removing said formwork from said body.
Claim 17
Dependent Claim
46 words
The method defined in claim 15 wherein the formwork defines an opening, and including the step of attaching a mounting plate to the formwork at said opening, wherein said step of attaching said disk and counterholder to said framework comprises attaching them to said mounting plate.
Claim 18
Dependent Claim
95 words
A testing device for testing the strength of a body comprising a setting substance, such as concrete, having a separable component, such as a coarse grain aggregate affecting the accuracy of said testing, comprising in combination, a screen arranged for defining a test site portion within the body to separate said separable component from the test site within the screen, a resilient disk and a substantially parallel counterholder defining an aperture larger than said disk arranged at said test site portion with said screen connected to said counterholder, and said disk disposed in said aperture.
Claim 19
Dependent Claim
95 words
A testing device for testing the strength of a body comprising a setting substance, such as concrete, having a separable component, such as a coarse grain aggregate affecting the accuracy of said testing, comprising in combination, a screen arranged for defining a test site portion within the body to separate said separable component from the test site within the screen, a resilient disk and a substantially parallel counterholder defining an aperture larger than said disk arranged at said test site portion with said screen connected to said counterholder, and said disk disposed in said aperture.
Claim 20
Dependent Claim
33 words
A testing device as defined in claim 17 including formwork for defining the body, said formwork defining an opening, a plate mounted at said opening, and said screen being fixed to said plate.
Claim 21
Dependent Claim
29 words
A testing device as defined in claim 18 wherein said plate defines openings therein, detachable closing plates close said openings, and including force exerting means passed through said openings.
Claim 22
Dependent Claim
35 words
A testing device aS defined in claim 17 wherein the resilient disk has an upper limit of resiliency defined by a negligible compression of the disk to the pressure of said body thereon during setting.
Claim 23
Dependent Claim
30 words
A testing device as defined in claim 17 wherein the lower limit of resiliency of said resilient disk is defined by the lowest desired measuring value of the substance strength.
Claim 24
Dependent Claim
33 words
A testing device as defined in claim 17 including means protecting said aperture of said counterholder to keep any body portion with said separable component therein from passing into said test site portion.
Claim 25
Dependent Claim
51 words
A testing device as defined in claim 17 including a test disk placed in the substance at said test site portion at a position displaced from said resilient disk with a guide tube extending from the test disk for receiving a force transmission rod to displace it toward said resilient disk.
Claim 26
Dependent Claim
32 words
A testing device as defined in claim 17 including means protecting said aperture of the counterholder to keep any body portion with said separable component therein from passing into said test site.
Claim 27
Dependent Claim
41 words
A testing device as defined in claim 17 including a test disk placed in the substance at said test site portion spaced from said resilient disk defining therein an oblong opening dimensioned for passing a portion of a force exerting rod.
Claim 28
Dependent Claim
40 words
A testing device as defined in claim 17 including a test disk placed in the substance at said test site portion spaced from said resilient disk and having a force transmission rod thereon reaching toward the surface of said body.
Claim 29
Dependent Claim
70 words
A testing device as defined in claim 17 including a counterholder ring and a test disk attached to a piston shaft, said test disk being embedded in said test site portion spaced from said resilient disc and said ring being of greater size than said test disk to thereby cause a conic frustum rupture of said substance toward said resilient disk when the forces exceed the strength of said substance.
Claim 30
Dependent Claim
22 words
A testing device as defined in claim 27 including a guide tube detachably fastened to said test disk for guiding said shaft.
Claim 31
Independent Claim
128 words
The method of testing the momentary strength of a body comprising a setting substance, such as concrete, comprising the steps of mounting formwork to confine materials of said body, removably mounting on said formwork an assembly which includes a measuring disk to be embedded in said substance, pouring said materials into said formwork to form said body and envelop said disk, detaching said assembly from said formwork, removing said formwork from said body to leave exposed a portion of said assembly accessible to pull said disk from said body to test the strength of said body, and applying a measurable load by means of said assembly to said disk to break it away from said body thereby identifying at the break away point the strength of said body.
Claim 32
Independent Claim
128 words
The method of testing the momentary strength of a body comprising a setting substance, such as concrete, comprising the steps of mounting formwork to confine materials of said body, removably mounting on said formwork an assembly which includes a measuring disk to be embedded in said substance, pouring said materials into said formwork to form said body and envelop said disk, detaching said assembly from said formwork, removing said formwork from said body to leave exposed a portion of said assembly accessible to pull said disk from said body to test the strength of said body, and applying a measurable load by means of said assembly to said disk to break it away from said body thereby identifying at the break away point the strength of said body.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |