CN109781527A - A kind of test specimen and test method for testing concrete sample tensile strength - Google Patents
A kind of test specimen and test method for testing concrete sample tensile strength Download PDFInfo
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- CN109781527A CN109781527A CN201910112727.1A CN201910112727A CN109781527A CN 109781527 A CN109781527 A CN 109781527A CN 201910112727 A CN201910112727 A CN 201910112727A CN 109781527 A CN109781527 A CN 109781527A
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Abstract
The invention discloses a kind of test specimens and test method for testing concrete sample tensile strength, and the test specimen includes: two the first columnar members and second columnar member；Two the first columnar members are cylindrical body, and two the first columnar members are coaxially disposed；Second columnar member is set between two the first columnar members, and it is coaxially disposed with the first columnar member, second columnar member offers annular groove along its circumferential direction, by applying confining pressure power on the outer surface of the annular groove of test specimen, the confining pressure power born when to test specimen fracture is analyzed, the tensile strength of test specimen is determined based on the analysis results, and entire test specimen effectively avoids the problem of existing test specimen is by eccentric force all by uniform pressure.
Description
Technical field
The present invention relates to technical field of civil engineering more particularly to it is a kind of test concrete sample tensile strength test specimen and
Test method.
Background technique
Concrete tensile strength refers to concrete axial tensile strength, i.e., is born when concrete sample is broken after by pulling force
Peak load carry divided by the resulting stress value of sectional area.Due to there is no ideal test method, concrete in uniaxial is direct
Tensile strength is obtained by Indirect Tensile Tests or by the empirical formulas with compression strength mostly at present.
Concrete Indirect Tensile Tests method (such as tensile splitting strength and bending tensile strength) is stringent although relatively simple
They are not the true reflection of Analysis of Concrete Tensile intensity in fact.Either resistance to compression or tensile test, all inevitably by
Eccentric influence, it is eccentric even more serious after test specimen cracking especially in tension test.Using a kind of relatively easy in tension test
Method guarantee that it is particularly important that test specimen uniaxial force and stress are uniformly distributed.It in comparison, can using adhesive type clamp method
To obtain more uniform stress distribution in test specimen.It is simplest to paste the end that tensile test specimen is cylindrical body concrete sample
One block of certain thickness steel plate is respectively pasted, is then further applied load along central axis, but there are still test piece ends for such test method
There are the non-uniform problems of stress transfer.Test specimen two ends are loading ends, and it is not the design stress state of test specimen, such as that stress is complicated
The full test specimen of fruit is made into homogeneous diameter, then general large deformation or destruction to occur in the two-end part of load first, is unable to reach true
Positive test objective.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of examinations for testing concrete sample tensile strength
Part and test method；
A kind of test specimen for testing concrete sample tensile strength proposed by the present invention, the test specimen includes: two the first columns
Shape part and second columnar member；
Two the first columnar members are cylindrical body, and two the first columnar members are coaxially disposed；
Second columnar member is set between two the first columnar members, and is coaxially disposed with the first columnar member, the second columnar member edge
Its circumferential direction offers annular groove.
Preferably, the shaft section area of second columnar member first reduces along its axis increases afterwards.
Preferably, the section of the bottom surface of the annular groove is a circular arc.
Preferably, the bottom surface of the annular groove connects the side of two the first columnar members.
Preferably, the second columnar member is with central shaft midpoint and symmetrical perpendicular to the plane of central axis, and to cross central axis
Any plane it is symmetrical.
Preferably, the corresponding central angle of the circular arc is 120 °, and the bottom surface radius of the first columnar member is 50mm, the first cylindricality
The height of part is 20mm, and the height of the second columnar member is 60mm.
Preferably, which comprises
Apply confining pressure power on the outer surface of the annular groove of test specimen, and each on the direction of confining pressure power and the outer surface of annular groove
The tangential direction of point is vertical；
The confining pressure power born when to test specimen fracture is analyzed, and determines the tensile strength of test specimen based on the analysis results.
The invention has the benefit that applying confining pressure to test specimen, the tension for obtaining concrete sample can be accurately calculated
Intensity avoids the problem of existing test specimen is by eccentric force, the test specimen in the present invention, in tensile strength test process well
In, entire test specimen avoids that the test piece end stress transfer occurred in traditional experiment is non-uniform to ask all by uniform pressure
Topic, easy to operate, test specimen force way is simple, and calculated result is accurate.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of test specimen for testing concrete sample tensile strength proposed by the present invention；
Fig. 2 is a kind of cross-sectional view of test specimen for testing concrete sample tensile strength proposed by the present invention.
Specific embodiment
The following describes the present invention in detail with reference to examples.The wherein identical appended drawing reference table of identical components
Show, it should be noted that word "front", "rear" used in the following description, "left", "right", "up" and "down" refer to attached drawing
In direction, word "inner" and "outside" refer respectively to the direction towards or away from geometric center of specific component.
Referring to Figures 1 and 2, a kind of test specimen for testing concrete sample tensile strength proposed by the present invention, the test specimen packet
It includes: two the first columnar members and second columnar member；
Two the first columnar members are cylindrical body, and two the first columnar members are coaxially disposed；
Second columnar member is set between two the first columnar members, and is coaxially disposed with the first columnar member, the second columnar member edge
Its circumferential direction offers annular groove；
The shaft section area of second columnar member first reduces along its axis to be increased afterwards, the section of the bottom surface of the annular groove
For a circular arc, the bottom surface of the annular groove connects the side of two the first columnar members, and the second columnar member is with central shaft midpoint
And it is symmetrical perpendicular to the plane of central axis and symmetrical to cross any plane of central axis, the corresponding central angle of the circular arc is
120 °, the bottom surface radius of the first columnar member is 50mm, and the height of the first columnar member is 20mm, and the height of the second columnar member is
60mm。
Test the test method of the test specimen of concrete sample tensile strength, comprising: on the outer surface of the annular groove of test specimen
Apply confining pressure power, and the direction of confining pressure power is vertical with the tangential direction of each point on the outer surface of annular groove；When institute is broken to test specimen
The confining pressure power of receiving is analyzed, and determines the tensile strength of test specimen based on the analysis results.
In concrete scheme, test specimen of the present invention is made first, and the corresponding central angle of circular arc is 120 °, the first cylindricality
The bottom surface radius of part is 50mm, and the height of the first columnar member is 20mm, and the height of the second columnar member is 60mm, corresponding according to circular arc
Central angle, the bottom surface radius of the first columnar member, that the height of the first columnar member, the height of the second columnar member can calculate circular arc is corresponding
Circle the smallest radius of radius and test specimen section；Then test specimen is fixed in the horizontal direction, keeps test specimen two ends face in Vertical Square
It does not constrain upwards, applies confining pressure power on the outer surface of the annular groove of test specimen, the rate of pressure P, pressurization are generally acknowledged that
0.001-0.0001MPa/min is proper, maximum intensity when test specimen destroys, and record test specimen destroys；
The vertical direction of any point on the outer surface of the annular groove of test specimen, the tangent line of this point is the stress side of this point
To we can decompose this and arrive with joint efforts horizontally and vertically, the resultant force and level of the vertical direction component of every bit
The ratio between resultant force of direction component is S1/S2, and (S1 is the difference of test specimen maximum cross-section and minimum cross-sectional area, and S2 is the ring of test specimen
The area of largest chord composition where the outer surface of shape slot), the tensile strength P of test specimenIt draws=P × S1/ (S12+S22)0.5, P is examination
Maximum intensity when part destroys.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of test specimen for testing concrete sample tensile strength, which is characterized in that the test specimen includes: two the first columnar members
With second columnar member；
Two the first columnar members are cylindrical body, and two the first columnar members are coaxially disposed；
Second columnar member is set between two the first columnar members, and is coaxially disposed with the first columnar member, and the second columnar member is along its week
To offering annular groove.
2. the test specimen of test concrete sample tensile strength according to claim 1, which is characterized in that second cylindricality
The shaft section area of part first reduces along its axis to be increased afterwards.
3. the test specimen of test concrete sample tensile strength according to claim 2, which is characterized in that the annular groove
The section of bottom surface is a circular arc.
4. the test specimen of test concrete sample tensile strength according to claim 3, which is characterized in that the annular groove
Bottom surface connects the side of two the first columnar members.
5. the test specimen of test concrete sample tensile strength according to claim 4, which is characterized in that the circular arc is corresponding
Central angle be 120 °, the bottom surface radius of the first columnar member is 50mm, and the height of the first columnar member is 20mm, the second columnar member
Height is 60mm.
6. it is according to claim 4 test concrete sample tensile strength test specimen, which is characterized in that the second columnar member with
Central shaft midpoint and symmetrical perpendicular to the plane of central axis, and it is symmetrical to cross any plane of central axis.
7. the test method of the test specimen of concrete sample tensile strength, the method packet are tested described in -6 according to claim 1
It includes:
Apply confining pressure power, and each point on the direction of confining pressure power and the outer surface of annular groove on the outer surface of the annular groove of test specimen
Tangential direction is vertical；
The confining pressure power born when to test specimen fracture is analyzed, and determines the tensile strength of test specimen based on the analysis results.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910112727.1A CN109781527A (en) | 2019-02-13 | 2019-02-13 | A kind of test specimen and test method for testing concrete sample tensile strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910112727.1A CN109781527A (en) | 2019-02-13 | 2019-02-13 | A kind of test specimen and test method for testing concrete sample tensile strength |
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| CN109781527A true CN109781527A (en) | 2019-05-21 |
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| CN201910112727.1A Pending CN109781527A (en) | 2019-02-13 | 2019-02-13 | A kind of test specimen and test method for testing concrete sample tensile strength |
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| CN101435758A (en) * | 2008-12-17 | 2009-05-20 | 天津大学 | Method for testing direct tensile strength of concrete base cleaning pulp or mortar |
| CN201575951U (en) * | 2009-11-30 | 2010-09-08 | 张嶔崎 | Auxiliary clamp used on tensile testing machine |
| CN105209767A (en) * | 2013-03-20 | 2015-12-30 | Ruag瑞士股份公司，Ruag空间 | Device for testing out-of-plane tensile strength and method of testing of out-of-plane tensile strength of a load application element fitted to a composite sandwich panel |
| CN205209873U (en) * | 2015-11-19 | 2016-05-04 | 中国矿业大学(北京) | Tensile anchor clamps of experiment machine suitable for scanning electron microscope |
| CN105628610A (en) * | 2016-04-05 | 2016-06-01 | 大连理工大学 | Integration equipment and detection method for evaluating coating bonding strength based on interface fracture toughness |
| CN205879680U (en) * | 2016-06-28 | 2017-01-11 | 上海大学 | Small -size tensile anchor clamps to nonstandard sample |
| CN207095976U (en) * | 2017-08-28 | 2018-03-13 | 北京工业大学 | A kind of piece fixture for Concrete Material tensile test |
| CN107843484A (en) * | 2017-12-16 | 2018-03-27 | 福州大学 | Concrete tensile strength test device and test method |
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2019
- 2019-02-13 CN CN201910112727.1A patent/CN109781527A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435758A (en) * | 2008-12-17 | 2009-05-20 | 天津大学 | Method for testing direct tensile strength of concrete base cleaning pulp or mortar |
| CN201575951U (en) * | 2009-11-30 | 2010-09-08 | 张嶔崎 | Auxiliary clamp used on tensile testing machine |
| CN105209767A (en) * | 2013-03-20 | 2015-12-30 | Ruag瑞士股份公司，Ruag空间 | Device for testing out-of-plane tensile strength and method of testing of out-of-plane tensile strength of a load application element fitted to a composite sandwich panel |
| CN205209873U (en) * | 2015-11-19 | 2016-05-04 | 中国矿业大学(北京) | Tensile anchor clamps of experiment machine suitable for scanning electron microscope |
| CN105628610A (en) * | 2016-04-05 | 2016-06-01 | 大连理工大学 | Integration equipment and detection method for evaluating coating bonding strength based on interface fracture toughness |
| CN205879680U (en) * | 2016-06-28 | 2017-01-11 | 上海大学 | Small -size tensile anchor clamps to nonstandard sample |
| CN207095976U (en) * | 2017-08-28 | 2018-03-13 | 北京工业大学 | A kind of piece fixture for Concrete Material tensile test |
| CN107843484A (en) * | 2017-12-16 | 2018-03-27 | 福州大学 | Concrete tensile strength test device and test method |
Non-Patent Citations (3)
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| R. N. SCHOCK等: "《Hybrid fracture and the transition from extension fracture to shear fracture》", 《JOURNAL OF GEOPHYSICAL RESEARCH》 * |
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Application publication date: 20190521 |