CN101603900A - A kind of self-balancing test device of direct mensuration axial tensile strength of early-age concrete and assay method - Google Patents
A kind of self-balancing test device of direct mensuration axial tensile strength of early-age concrete and assay method Download PDFInfo
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- CN101603900A CN101603900A CNA2009101813944A CN200910181394A CN101603900A CN 101603900 A CN101603900 A CN 101603900A CN A2009101813944 A CNA2009101813944 A CN A2009101813944A CN 200910181394 A CN200910181394 A CN 200910181394A CN 101603900 A CN101603900 A CN 101603900A
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Abstract
The invention discloses a kind of self-equilibrating test unit and assay method of direct mensuration axial tensile strength of early-age concrete.Its determinator is made up of outside framework, inner formword, transmission rod, the hollow lifting jack of hydraulic pressure, hollow load transducer, ball pivot, set nut, polyfluortetraethylene plate, hydraulic oil pump and electric wire strain gauge.Remove the side template in the inner formword during test and unclamp fixing by Side Template in the template and the side plate in the outside framework, transmission rod is fixed on the Side Template central authorities in the inner formword, hydraulic oil pump drives the hollow lifting jack of hydraulic pressure, Side Template moves with the hollow lifting jack of hydraulic pressure, thereby break concrete sample, record axial tensile strength of early-age concrete.Apparatus of the present invention are simple in structure, convenient disassembly, and material requested and instrument are few, are not only applicable to scientific research, and are applicable to the mensuration of working-yard to axial tensile strength of early-age concrete.
Description
Technical field
The present invention relates to a kind of self-balancing test device and assay method of measuring the early stage axial tensile strength of concrete, belong to the concrete construction field.
Background technology
In the field of civil engineering, early the length of time (mainly refer to concrete hardening after to form removal), concrete axial tensile strength was very important.At xoncrete structure early during the length of time, the axial tensile strength development of concrete material rapidly, its rule is not by on top of, and the axial tensile strength of early-age concrete determines its cracking performance, and the axial tensile strength of accurately measuring early-age concrete has very important significance to estimating concrete cracking performance in length of time morning and avoiding the early-age concrete structure crack to occur.
Measure concrete tensile strength at present and mainly contain direct tensile test and indirect test method.The direct tensile test method mainly contains pre-buried method, outer folder method and mounting method.Indirect method mainly be by the test of concrete tensile strength or tensile splitting strength more rule of thumb the derivation of equation go out concrete axial tensile strength.These methods all need the whole form removals of the test specimen of being built and utilize testing machine to load.Bending tensile strength and split tensile strength can not really reflect concrete direct pulling strengrth on the other hand.When adopting existing tensile strength test method to measure the axial tensile strength of early-age concrete, owing to need form removal, and move test specimen, can cause the breakage of concrete sample, make test can't carry out or the success of the test rate extremely low.In addition, because the intensity of early-age concrete is low, embedded bar may skid off from concrete, makes test failure.Outer folder method is understood owing to stress raisers, thereby causes test specimen to destroy in advance, makes test failure.Mounting method can not record the axial tensile strength of early-age concrete because the curing big and glue of early-age concrete surface moisture needs the long time.
Summary of the invention
The invention provides a kind of self-equilibrating test unit and assay method of measuring axial tensile strength of early-age concrete, this device assembling is simple, easy to operate, it is less to test required instrument, can measure at the scene of building,, not need mobile test specimen as long as carry out local form removal, do not need special tension tester, easy to operate reusable.
In order to realize above-mentioned technical matters, the present invention is by the following technical solutions: plant the self-equilibrating test unit of measuring axial tensile strength of early-age concrete, comprise outside framework, inner formword, transmission rod, augmentor, described inner formword is made up of two Side Templates and both sides template, end fixed form in described two Side Templates is fixedlyed connected with an end of outside framework, but other end moving platen is connected with outside framework is detachable, but but and between this moving platen and outside framework, also leave a space of should moving platen moving, but described two side templates are arranged between fixed form and the moving platen, and but the area of the connectivity port of described Side Template and fixed form and moving platen is less than the cross-sectional area of its inside, but described transmission rod is arranged on the described moving platen, and described augmentor is connected with transmission rod and masterpiece is used on the described transmission rod.
Described augmentor comprises: the hollow lifting jack of hydraulic pressure, hollow load transducer, ball pivot, set nut, hydraulic oil pump and electric wire strain gauge, described ball pivot is arranged between heart load transducer and the set nut, the hollow lifting jack of described hydraulic pressure is connected with hydraulic oil pump by oil pipe, and described hollow load transducer is connected with electric wire strain gauge by quad.Described outside framework comprises base plate, end plate, side plate, and base plate and end plate are welded as a whole, and side plate is connected with end plate by nut.
But the space between the end plate of described moving platen and outside framework is not less than the distance of 10mm.
The center of described transmission rod and Side Template is by being threaded.
Be connected by bolt between the hollow lifting jack of described hydraulic pressure and the end plate.
End face at base plate is provided with tetrachloro polyvinyl fluoride plate.
A kind of assay method of axial tensile strength of early-age concrete, step is as follows:
The first step: Side Template in the inner formword and side template are connected and fixed, but again with moving platen) and the side template of fixed form and outside framework be connected and fixed with bolt, with the fresh concrete to be measured inner formword of packing into;
Second step: when needs are tested, power transmission guide rod and Side Template are connected and fixed, remove side template, and but the side template of moving platen and outside framework taken apart, test specimen will destroy between the side template of interior lamina membranacea, act on the power transmission guide rod by augmentor, destroy until test specimen, and the big or small P of record test specimen acting force when destroying;
The 3rd step: the axial tensile strength that is early-age concrete according to the ratio of the area S of acting force P and concrete sample breaking section.
Described augmentor adopts the hollow lifting jack of hydraulic pressure, hollow load transducer, ball pivot, set nut, hydraulic oil pump and electric wire strain gauge, open strainmeter, zeroing, fixing and locking nut again, when guaranteeing locking, strain-ga(u)ge reading remains unchanged, remove side template, unclamp the coupling bolt of Side Template and side template, by hydraulic oil pump the hollow lifting jack of hydraulic pressure is loaded, load P in the time of can measuring test specimen destruction by the reading of strainmeter, the ratio of the area S of load P and concrete sample breaking section is the axial tensile strength of early-age concrete.
Compared with prior art, the invention has the beneficial effects as follows:
1, proving installation of the present invention adopts the mode that inner formword is set in outside framework, and with the reduced cross-sectional area of the medial side template of interior lamina membranacea, and it is dismountable, simultaneously, two Side Templates, one end and the outside framework of interior lamina membranacea are fixed, and an end can move under the effect of external force load, total is ingenious, need not during test test specimen is taken out, do not destroy test specimen, measure the degree of accuracy height.
2, apparatus of the present invention assembling is simple, and easy to operate, it is less to test required instrument, can measure at the scene of building, as long as carry out local form removal, does not need mobile test specimen, does not need special tension tester, easy to operate reusable.
Description of drawings
Fig. 1 is the single unit system figure of proving installation of the present invention
Fig. 2 is the outside framework of proving installation of the present invention
Fig. 3 is the side view of proving installation of the present invention
Fig. 4 is the inner formword figure of proving installation of the present invention
Fig. 5 is the left side view of proving installation of the present invention
Fig. 6 is the right side view of proving installation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is elaborated:
A kind of self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete, the augmentor that comprises outside framework 1, inner formword 2, forms by transmission rod 3, the hollow lifting jack 4 of hydraulic pressure, hollow load transducer 5, ball pivot 6, set nut 7, hydraulic oil pump 8 and electric wire strain gauge 9.The hollow lifting jack 4 of hydraulic pressure is connected with hydraulic oil pump 8 by oil pipe 10, and the early-age concrete test specimen is realized loading.Hollow load transducer 5 is connected the load in the testing experiment process by quad 11 with electric wire strain gauge 9.
Adopt the self-equilibrating test unit of axial tensile strength of early-age concrete of the present invention measure axial tensile strength of early-age concrete method be to may further comprise the steps during test:
Side Template in the inner formword 2 17,18 and side template 19,20 usefulness bolts are connected and fixed, again Side Template 18 side template 15 and the 16 usefulness bolts with outside framework 1 are connected and fixed, with the fresh concrete to be measured inner formword 2 of packing into.When needs are tested, power transmission guide rod 3 and Side Template 18 are connected and fixed, open strainmeter 11, zeroing, the fixing and locking nut 7 again, and when guaranteeing locking, strain-ga(u)ge reading remains unchanged.Remove side template 19 and 20, unclamp the coupling bolt of Side Template 18 and side template 15 and 16.Load by the hollow lifting jack of 8 pairs of hydraulic pressure of hydraulic oil pump, the load P in the time of can measuring test specimen destruction by the reading of strainmeter, the ratio of the area S of load P and concrete sample breaking section is the axial tensile strength of early-age concrete.
Claims (8)
1, a kind of self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete, it is characterized in that: comprise outside framework (1), inner formword (2), transmission rod (3), augmentor, described inner formword is by two Side Templates (17,18) and two side templates (19,20) form, end fixed form (17) in described two Side Templates is fixedlyed connected with an end of outside framework (1), but other end moving platen (18) and detachable connection of outside framework (1), but and at this moving platen (18) and outside framework (1) but between also leave a space of should moving platen (18) moving, described two side templates (19,20) be arranged on fixed form (17) but and between the moving platen (18), and described Side Template (17,18) with fixed form (17) but and the area of the connectivity port of moving platen (18) less than the cross-sectional area of its inside, described transmission rod (3) but be arranged on the described moving platen, described augmentor is connected with transmission rod (3) and masterpiece is used on the described transmission rod (3).
2, the self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete according to claim 1, it is characterized in that: described augmentor comprises: the hollow lifting jack of hydraulic pressure (4), hollow load transducer (5), ball pivot (6), set nut (7), hydraulic oil pump (8) and electric wire strain gauge (9), described ball pivot (6) is arranged between hollow load transducer (5) and the set nut (7), the hollow lifting jack of described hydraulic pressure (4) is connected with hydraulic oil pump (8) by oil pipe (10), and described hollow load transducer (5) is connected with electric wire strain gauge (9) by quad (11).
3, the self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete according to claim 1 and 2, it is characterized in that: described outside framework comprises base plate (12), end plate (13,14), side plate (15,16), base plate (12) and end plate (13,14) are welded as a whole, and side plate (15,16) is connected with end plate (13,14) by nut.
4, the self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete according to claim 1 is characterized in that: but the space between the end plate (14) of described moving platen (18) and outside framework is not less than the distance of 10mm.
5, the self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete according to claim 1 is characterized in that: be connected by bolt between the hollow lifting jack of described hydraulic pressure (4) and the end plate (14).
6, the self-equilibrating test unit of direct mensuration axial tensile strength of early-age concrete according to claim 1 is characterized in that: the end face at base plate (12) is provided with polyfluortetraethylene plate (21).
7, a kind of assay method that adopts the self-equilibrating test unit of the described direct mensuration axial tensile strength of early-age concrete of claim 1, it is characterized in that: step is as follows:
The first step: Side Template in the inner formword (2) (17,18) and side template (19,20) are connected and fixed, again but moving platen (18) and fixed form (17) side template (15,16) with outside framework (1) is connected and fixed with bolt, the fresh concrete to be measured inner formword (2) of packing into;
Second step: when needs are tested, power transmission guide rod (3) and Side Template (18) are connected and fixed, remove side template (15,16), and but the side template (15,16) of moving platen (18) and outside framework (1) taken apart, test specimen will destroy between the side template of interior lamina membranacea (2), act on the transmission rod (3) by augmentor, destroy until test specimen, and the big or small P of record test specimen acting force when destroying;
The 3rd step: the axial tensile strength that is early-age concrete according to the ratio of the area S of acting force P and concrete sample breaking section.
8, the assay method of the self-equilibrating test unit of axial tensile strength of early-age concrete according to claim 7, it is characterized in that: described augmentor adopts the hollow lifting jack of hydraulic pressure (4), hollow load transducer (5), ball pivot (6), set nut (7), hydraulic oil pump (8) and electric wire strain gauge (9), open strainmeter (11), zeroing, fixing and locking nut (7) again, when guaranteeing locking, strain-ga(u)ge reading remains unchanged, remove side template (19) and (20), unclamp the coupling bolt of Side Template (18) and side template (15) and (16), by hydraulic oil pump (8) the hollow lifting jack of hydraulic pressure is loaded, load P in the time of can measuring test specimen destruction by the reading of strainmeter, the ratio of the area S of load P and concrete sample breaking section is the axial tensile strength of early-age concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101813944A CN101603900B (en) | 2009-07-15 | 2009-07-15 | Self-balancing test device and method for directly testing axial tensile strength of early-age concrete |
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| CN2009101813944A CN101603900B (en) | 2009-07-15 | 2009-07-15 | Self-balancing test device and method for directly testing axial tensile strength of early-age concrete |
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| CN101603900B CN101603900B (en) | 2011-05-25 |
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| CN103149094A (en) * | 2013-03-05 | 2013-06-12 | 华北水利水电学院 | Measuring method and device for tensile creep of early-age concrete |
| CN103163016A (en) * | 2013-02-27 | 2013-06-19 | 武汉大学 | Auxiliary device for carrying out axial tension test on quasi brittle materials |
| CN103207121A (en) * | 2013-03-21 | 2013-07-17 | 河海大学 | Constant-axial-force self-balanced loading device for different column section joints |
| CN104062173A (en) * | 2014-06-24 | 2014-09-24 | 北京交通大学 | Soil tensile strength testing apparatus |
| CN111707542A (en) * | 2020-05-20 | 2020-09-25 | 河南省水利科学研究院 | Test method for measuring tensile strength of concrete by using transverse splitting method of cylinder |
| CN111965019A (en) * | 2020-07-23 | 2020-11-20 | 河海大学 | Visual integral type soil body unipolar stretching device breaks |
| CN112985983A (en) * | 2019-12-17 | 2021-06-18 | 同济大学 | Concrete axle draws testing arrangement |
| ES2931848A1 (en) * | 2021-06-23 | 2023-01-03 | Univ Burgos | DIRECT TENSILE TEST SPECIMEN FOR CONCRETE AND OTHER SECONDARY BINDING MATERIALS (Machine-translation by Google Translate, not legally binding) |
Family Cites Families (2)
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| CN1212510C (en) * | 2003-08-20 | 2005-07-27 | 大连理工大学 | Triaxial testing machine vertical direction load force frame floating device and method |
| CN100347544C (en) * | 2005-01-07 | 2007-11-07 | 清华大学 | Large-sized multifunction material three-shaft static-dynamic test machine |
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- 2009-07-15 CN CN2009101813944A patent/CN101603900B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163016A (en) * | 2013-02-27 | 2013-06-19 | 武汉大学 | Auxiliary device for carrying out axial tension test on quasi brittle materials |
| CN103149094A (en) * | 2013-03-05 | 2013-06-12 | 华北水利水电学院 | Measuring method and device for tensile creep of early-age concrete |
| CN103207121A (en) * | 2013-03-21 | 2013-07-17 | 河海大学 | Constant-axial-force self-balanced loading device for different column section joints |
| CN103207121B (en) * | 2013-03-21 | 2015-10-21 | 河海大学 | The force self-balanced charger of a kind of different column section node constant shaft |
| CN104062173A (en) * | 2014-06-24 | 2014-09-24 | 北京交通大学 | Soil tensile strength testing apparatus |
| CN112985983A (en) * | 2019-12-17 | 2021-06-18 | 同济大学 | Concrete axle draws testing arrangement |
| CN111707542A (en) * | 2020-05-20 | 2020-09-25 | 河南省水利科学研究院 | Test method for measuring tensile strength of concrete by using transverse splitting method of cylinder |
| CN111965019A (en) * | 2020-07-23 | 2020-11-20 | 河海大学 | Visual integral type soil body unipolar stretching device breaks |
| CN111965019B (en) * | 2020-07-23 | 2021-11-09 | 河海大学 | Visual integral type soil body unipolar stretching device breaks |
| ES2931848A1 (en) * | 2021-06-23 | 2023-01-03 | Univ Burgos | DIRECT TENSILE TEST SPECIMEN FOR CONCRETE AND OTHER SECONDARY BINDING MATERIALS (Machine-translation by Google Translate, not legally binding) |
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| CN101603900B (en) | 2011-05-25 |
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