Method and apparatus for early strength testing of in-place concrete
阅读：466发布：2022-06-27
专利汇可以提供Method and apparatus for early strength testing of in-place concrete专利检索，专利查询，专利分析的服务。并且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.，下面是Method and apparatus for early strength testing of in-place concrete专利的具体信息内容。
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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*.
8. The method defined in claim 7 including the step of limiting said angle to the range of 63* and 73*.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. 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.
18. 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.
19. 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.
20. 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.
21. 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.
22. 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.
23. 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.
24. 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.
25. 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.
26. 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.
27. 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.
28. A testing device as defined in claim 27 including a guide tube detachably fastened to said test disk for guiding said shaft.
29. 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.
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