CN102866245B - Test method and test device for unrestraint measurement of concrete deformation performance - Google Patents
Test method and test device for unrestraint measurement of concrete deformation performance Download PDFInfo
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- CN102866245B CN102866245B CN201210343567.XA CN201210343567A CN102866245B CN 102866245 B CN102866245 B CN 102866245B CN 201210343567 A CN201210343567 A CN 201210343567A CN 102866245 B CN102866245 B CN 102866245B
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000010998 test method Methods 0.000 title claims abstract description 16
- 238000005259 measurement Methods 0.000 title claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000004816 latex Substances 0.000 claims abstract description 4
- 229920000126 latex Polymers 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 16
- 239000000725 suspension Substances 0.000 claims description 16
- 239000004033 plastic Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 8
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- 238000010008 shearing Methods 0.000 description 2
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- 239000004566 building material Substances 0.000 description 1
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- 230000008602 contraction Effects 0.000 description 1
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- 238000006297 dehydration reaction Methods 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
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- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses a test method and a test device for unrestraint measurement of concrete deformation performance. The test method adopts the method of suspending the concrete sample by heavy liquid, the liquid has no shear modulus, and has no lateral constraint effect on the concrete sample, and the concrete sample can freely deform without constraint, so that the shrinkage (expansion) deformation of the concrete can be accurately measured; the test device is internally filled with a suspended heavy liquid, and the concrete test piece is suspended in the heavy liquid; a temperature sensor is embedded in the concrete sample; a latex thin layer is laid on the surface of the test piece, measuring targets are embedded at two ends of the test piece, non-contact displacement sensors are installed at two sides of the test container, and load sensors are installed below the test piece. The test device can accurately measure the deformation curve of the whole process shrinkage and expansion of the concrete.
Description
Technical field
The present invention relates to a kind of test method and the test unit of measuring concrete deformation performance, particularly a kind of test method and test unit thereof measuring concrete deformation performance without constraint.
Background technology
Concrete material has the history of more than 150 year for a long time as a kind of firm durable large building materials, along with the development of modern concrete technology, the good concrete of a large amount of high strength, serviceability is widely used.But, many xoncrete structures build or occur in various degree in use procedure, multi-form crack, this is quite general phenomenon.Distress in concrete can cause seepage, causes the reduction of creep rupture strength, as protective seam peel off, steel bar corrosion, concrete carbonization etc., larger impact is caused on the intensity of structure, permanance.The origin cause of formation of distress in concrete is very complicated, but the concrete shrinkage deformation that certainly crack and hydration heat of concrete, autogenous shrinkage, dehydration drying shrinkage, Carbonization contract, self-desiccation shrinkage etc. cause has important relation.Therefore, in order to reach the object reducing and control distress in concrete, engineering technical personnel pay much attention to the research to concrete shrinkage deformation performance for a long time.
Concrete shrinkage test refers at the construction of laboratory simulation concrete component, work or specific a certain environment, in such circumstances, and the deformation parameter of observation or measurement concrete shrinkage test specimen.Concrete shrinkage test is the important tests of research concrete shrinkage deformation performance, and whether test method can obtain concrete drawdown deformation actual value accurately, calculates and assessment of performance important in inhibiting for the study mechanism of concrete shrinkage, distortion.Therefore, engineering technical personnel were not interrupted for the research of concrete shrinkage test method always, and achieved many achievements in the last few years.Concrete shrinkage test method is varied.From the shape of test specimen, can be divided into: (1) flat confined shrinkage split test method, Specimen Shape is square plate, provides constraint by the wave thin plate that bends up or L-type reinforcing bar; (2) circular ring type confined shrinkage split test method, Specimen Shape is annulus, is limited concrete shrinkage by interior annulus; (3) prism method, its Specimen Shape is prism, simulation concrete free shrink.Can be divided into from deformation measurement method: (1) contact method, contact method uses embedded strain gauge, optical fibre displacement sensor and uses mechanical type clock gauge etc. to measure concrete drawdown deformation; (2) eyes with non-contact method, uses microscopic crack, or installs and measures target in surface of test piece, and employing laser range finder, eddy current sensor measure the change of piece lengths.
Summary of the invention
In order to overcome the defect that above-mentioned prior art exists, the invention provides a kind of test method and the test unit thereof of measuring concrete deformation performance without constraint, this test method and test unit thereof can record concrete overall process accurately and shrink and the deformation curve expanded.
To achieve these goals, technical scheme of the present invention is as follows: a kind of test method measuring concrete deformation performance without constraint, after comprising the steps: that concrete sample is built and completed, putting into together with die trial fills in the good suspension heavy-fluid of prior proportioning, adjustment suspension heavy-fluid proportion is until when it is identical with concrete sample proportion, and concrete sample is suspended in suspension heavy-fluid; Then slowly opening die trial makes the concrete sample of liquid-plastic state be separated with die trial completely; Displacement transducer on the measurement target installed by test specimen two ends and fixed mount records the relative deformation of concrete sample length direction, is recorded the temperature of suspension heavy-fluid and concrete sample inside by temperature sensor.
For measuring a test unit for concrete deformation method for testing performance without constraint, fill in described test unit and concrete sample can be made to be suspended in suspension heavy-fluid wherein; Be embedded with temperature sensor in described concrete sample, surface of test piece is equipped with latex thin layer, and test specimen two ends are embedded with measurement target, and test chamber both sides are provided with displacement transducer.
Further, the load sensor for measuring test specimen buoyant weight degree is installed below described test specimen.
Further, institute's displacement sensors is non-contact displacement transducer.
The maximum innovation of the present invention is, test specimen suspends with the liquid that concrete proportion is identical by method selection, liquid is without modulus of shearing, to concrete sample without sidewise restraint effect, concrete sample can unfettered ground Free Transform, really achieve concrete unconstrained reformulation under this state, thus the contraction of concrete overall process and the deformation curve expanded can be recorded accurately.For measuring the test unit of concrete deformation method for testing performance without constraint in the present invention simultaneously, its structure is simple, and easy to use, test accuracy is high.
accompanying drawing illustrates:
Fig. 1 is that the present invention measures the test unit structural representation of concrete deformation performance without constraint.
embodiment:
In order to make technological means of the present invention, creation characteristic and reach object be easy to understand understand, set forth the present invention further below in conjunction with specific embodiment.
As shown in Figure 1, a kind of test method measuring concrete deformation performance without constraint, after comprising the steps: that concrete sample 7 is built and completed, putting into together with die trial 4 fills in the good suspension heavy-fluid 5 of prior proportioning, the proportion of this suspension heavy-fluid 5 is adjustable, when suspension heavy-fluid 5 is identical with test concrete sample 7 proportion, the buoyancy that concrete sample 7 bears is equal with gravity, and concrete sample 7 is in suspended state; Then slowly opening die trial 4 makes the concrete sample 7 of liquid-plastic state be separated with die trial 4 completely.Now, support although test specimen 7 loses die trial 4, suspension heavy-fluid 5 makes the shape of concrete sample 7 be kept, and the distortion of test specimen 7 is in without restrained condition completely; Displacement transducer 1 on the measurement target 3 installed by test specimen 7 two ends and fixed mount can record the relative deformation of concrete sample 7 length direction, is recorded the temperature of suspension heavy-fluid 5 and concrete sample 7 inside by temperature sensor 2.
For measuring a test unit for concrete deformation method for testing performance without constraint, described test unit comprises a test chamber 9, fills concrete sample 7 can be made to be suspended in suspension heavy-fluid 5 wherein in it; Temperature sensor 2 is embedded with in described concrete sample 7, test specimen 7 surface is equipped with latex thin layer 6, test specimen 7 two ends are embedded with measures target 3, and test chamber 9 both sides are provided with displacement transducer 1, are provided with the load sensor 8 for measuring test specimen buoyant weight degree below test specimen 7.As further improvement, institute's displacement sensors 1 is eddy current displacement sensor.
The inventive method selects same concrete proportion identical liquid to be suspended by test specimen, liquid is without modulus of shearing, to concrete sample without sidewise restraint effect, concrete sample can unfettered ground Free Transform, really achieves concrete unconstrained reformulation under this state.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (3)
1. measure the test method of concrete deformation performance without constraint for one kind, it is characterized in that, after comprising the steps: that concrete sample is built and completed, putting into together with die trial fills in the good suspension heavy-fluid of prior proportioning, adjustment suspension heavy-fluid proportion is until when it is identical with test concrete sample proportion, and concrete sample is suspended in suspension heavy-fluid; Then slowly opening die trial makes the concrete sample of liquid-plastic state be separated with die trial completely; Displacement transducer on the measurement target installed by test specimen two ends and fixed mount records the relative deformation of concrete sample length direction, recorded the temperature of suspension heavy-fluid and concrete sample inside by temperature sensor, institute's displacement sensors is non-contact displacement transducer.
2. for the test unit measuring concrete deformation method for testing performance without constraint according to claim 1, it is characterized in that comprising a test chamber, fill in described test chamber and concrete sample can be made to be suspended in suspension heavy-fluid wherein; Be embedded with temperature sensor in described concrete sample, surface of test piece is equipped with latex thin layer, and test specimen two ends are embedded with measurement target, and test chamber both sides are provided with displacement transducer, and institute's displacement sensors is non-contact displacement transducer.
3. the test unit for measuring concrete deformation method for testing performance without constraint according to claim 2, is characterized in that: be provided with the load sensor for measuring test specimen buoyant weight degree below described test specimen.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323576B (en) * | 2013-06-09 | 2015-04-08 | 河海大学 | True three-dimensional swell-shrink instrument |
| CN103604409B (en) * | 2013-12-03 | 2017-02-01 | 中国建筑第八工程局有限公司 | Newly-poured concrete floor slab overall shrinkage constraint deformation measuring method |
| CN104280290B (en) * | 2014-09-26 | 2017-04-05 | 同济大学 | A kind of device and its using method of test plastic concrete/mortar ess-strain |
| CN104502575B (en) * | 2015-01-19 | 2017-08-11 | 中国人民解放军后勤工程学院 | Target, the device and method using target test magnesium phosphate cement early-age shrinkage |
| CN105223345A (en) * | 2015-10-16 | 2016-01-06 | 中铁第五勘察设计院集团有限公司 | Mix cement stabilized graded macabam drying shrinkage detector |
| CN108181346B (en) * | 2017-12-21 | 2021-07-02 | 中国水利水电科学研究院 | On-site self-generated volume deformation and linear expansion coefficient monitoring equipment and method for full-graded concrete |
| CN109991263B (en) * | 2019-04-08 | 2021-12-07 | 上海市市政规划设计研究院有限公司 | Shrinkage test method of ultra-high performance concrete |
| CN112098455A (en) * | 2020-09-02 | 2020-12-18 | 兰州理工大学 | Instrument and method for testing shrinkage performance of road material |
| CN115951040B (en) * | 2023-02-20 | 2024-06-04 | 中铁建设建筑发展(海南)有限公司 | Concrete shrinkage experimental device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3779085A (en) * | 1972-07-24 | 1973-12-18 | E Rice | Means and method of testing expansive concrete |
| WO1994003803A1 (en) * | 1992-08-07 | 1994-02-17 | Veba A/S | An apparatus and a method for the testing of concrete for use when cementing casings in oil and gas wells |
| CN1547000A (en) * | 2003-12-09 | 2004-11-17 | 中国建筑材料科学研究院 | Cement mortar and concrete shrinkage stress testing method |
| CN1558234A (en) * | 2004-02-05 | 2004-12-29 | 哈尔滨工业大学 | Measuring device for concrete shrinkage and stress |
| CN1609614A (en) * | 2004-10-11 | 2005-04-27 | 同济大学 | Method for measuring plastic contraction rate of cement-base material |
| CN101344371A (en) * | 2008-08-26 | 2009-01-14 | 河海大学 | Device and method for measuring early age period linear deformation of cement based material |
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- 2012-09-17 CN CN201210343567.XA patent/CN102866245B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3779085A (en) * | 1972-07-24 | 1973-12-18 | E Rice | Means and method of testing expansive concrete |
| WO1994003803A1 (en) * | 1992-08-07 | 1994-02-17 | Veba A/S | An apparatus and a method for the testing of concrete for use when cementing casings in oil and gas wells |
| CN1547000A (en) * | 2003-12-09 | 2004-11-17 | 中国建筑材料科学研究院 | Cement mortar and concrete shrinkage stress testing method |
| CN1558234A (en) * | 2004-02-05 | 2004-12-29 | 哈尔滨工业大学 | Measuring device for concrete shrinkage and stress |
| CN1609614A (en) * | 2004-10-11 | 2005-04-27 | 同济大学 | Method for measuring plastic contraction rate of cement-base material |
| CN101344371A (en) * | 2008-08-26 | 2009-01-14 | 河海大学 | Device and method for measuring early age period linear deformation of cement based material |
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