CN203720174U - Concrete restrained expansion rate testing device - Google Patents
Concrete restrained expansion rate testing device Download PDFInfo
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- CN203720174U CN203720174U CN201420063201.1U CN201420063201U CN203720174U CN 203720174 U CN203720174 U CN 203720174U CN 201420063201 U CN201420063201 U CN 201420063201U CN 203720174 U CN203720174 U CN 203720174U
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Abstract
The utility model discloses a concrete restrained expansion rate testing device. The concrete restrained expansion rate testing device comprises a testing mould, a longitudinal restraining device and two displacement detecting devices, wherein a testing slot is formed in the testing mould; the longitudinal restraining device is arranged in the testing slot; the longitudinal testing device comprises two restraining plates and a reinforcing steel bar, wherein the two restraining plates are fixedly connected by the reinforcing steel bar; the longitudinal restraining device is further provided with two flexible plates which are placed in the testing slot and are tightly attached to two transverse inner side surfaces of the testing slot, respectively; two end surfaces of the two restraining plates are resisted against the corresponding flexible plates, respectively; detecting end heads longitudinally extending outwards are arranged on the upper parts of the two restraining plates; the two displacement detecting devices are resisted against the corresponding detecting end heads. The concrete restrained expansion rate testing device disclosed by the utility model is high in detecting precision and capable of continuously detecting deformation performance of the concrete.
Description
Technical field
The utility model relates to a kind of detection experimental apparatus of testing the plasticity of cement concrete material and the distortion of hardening phase.
Background technology
Cement concrete material is a kind of compound substance being formed by Binder Materials, coarse-fine aggregate, water and additive mix.Binder Materials slurry is due to plastic set contraction, autogenous shrinkage, chemical shrinkage, dry contraction in setting and harden process, and temperature variation all can cause drawdown deformation, thereby causes concrete shrinkage cracking, affects concrete permanance.At structure position expansive concrete materials used such as industrial pond, structures reinforcing band, concrete filled steel tubes, or pressure pipeline, grouting anchoring used from stress, self-compacting concrete material, again concrete expansion character is had higher requirements.Therefore, the accurate measurement of concrete material expansion or drawdown deformation has become the study hotspot in engineering research field.
Large quantity research shows, it is also very low early stage that the autogenous shrinkage of concrete material mainly betides intensity, and because fresh concrete is mecystasis, need after concrete coagulation is hardened to some strength (being generally moulding 24 hours) form removal, could measure the longitudinal length of test specimen, this just causes cannot effectively measure early plastic shrinkage distortion in the length of time and self-constriction distortion of concrete.About concrete shrinkage deformation method of testing, China's " Standard for test methods of longterm performance and durability of ordinary concrete standard " (GB/T 50082-2009) regulation point eyes with non-contact method and contact method.At present, the test unit that eyes with non-contact method can Gong be selected generally can only be surveyed concrete drawdown deformation; The concrete sample of contact method belt end used also can only be for the concrete material after sclerosis.
China's " Technical code for application of admixture in concrete " (GB 50119-2003) and " cement expansive material " (GB 23439-2009) recommend the limited expansion rate proving installation taking SP-540 type concrete comparator as representative, its weak point mainly contains: need to be with the test specimen of longitudinal limiter, comparator, par, a whole set of experimental facilities such as support, when each measurement, concrete sample must be placed on comparator support, after test, put back to again in constant temperature pond maintenance to next test the length of time, this just requires test specimen repeatedly to move on pond and comparator, test is wasted time and energy, and artificial interference is larger on measuring accuracy impact, secondly, existingly generally can only solely test constraint than regular way proving installation and expand or free expansion.Existing contactless concrete shrinkage deformation testing tool displacement transducer used is expensive, because die trial used is steel, rigidity is very large, can produce hoop effect to the concrete of dilatational strain, affect test result, therefore only can be used for testing concrete shrinkage deformation, for the bad adaptability of different pilot projects, experimental cost is higher.
Summary of the invention
The purpose of this utility model is to provide a kind of accuracy of detection high, can detect continuously the concrete limited expansion rate proving installation of concrete deformation performance.
In order to achieve the above object, the technical solution of the utility model is: a kind of concrete limited expansion rate proving installation, comprise die trial, longitudinally restraint device and two displacement detectors, die trial is provided with test trough, longitudinally restraint device is placed in test trough, longitudinally restraint device comprises two confinement plates and reinforcing bar, two confinement plates are fixedly connected with by reinforcing bar, also there are two flexible boards, and two flexible boards are placed in test trough, and be close to two horizontal medial surfaces of test trough respectively, two end faces of two confinement plates offset with corresponding flexible board respectively, and the top of two confinement plates is equipped with longitudinally overhanging detection termination, two displacement detectors offset with the corresponding termination of detecting.
Described displacement detector comprises fixed support, clock gauge and lock-screw, and support bracket fastened two ends are all by lock-screw and the load of die trial top, clock gauge and fixed support load, and clock gauge and detect termination and offset.
Adopt after said structure, owing to also thering are two flexible boards, and two flexible boards are placed in test trough, and be close to two horizontal medial surfaces of test trough respectively, two end faces of two confinement plates offset with corresponding flexible board respectively, in concrete NDT process, concreting is entered in the test trough of die trial, concrete mix is full of between two confinement plates, after concrete hardening, just can observe at any time the numerical value change of displacement detector, because two transverse sides of concrete sample are provided with flexible board, therefore the transversal shrinkage of concrete sample in testing process and expansion can be not restricted, thereby can be more accurate in the time that displacement detector detects concrete longitudinal deformation amount, improve accuracy of detection, again because the top of two confinement plates is equipped with longitudinally overhanging detection termination, two displacement detectors offset with the corresponding termination of detecting, therefore when concrete coagulation hardens into after test specimen, each parts of the utility model form an entirety, its entirety can be placed in constant temperature pond, surface level submergence concrete sample surface in constant temperature pond, but can be higher than the height of pick-up unit, therefore the utility model can ensure that concrete is under the foster condition of water, without repeatedly moving, just can from concreting, start to detect continuously the deformation performance of concrete sample.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the vertical view of Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Referring to Fig. 1, shown in 2, (in accompanying drawing 2, X is to representing laterally, Y-direction represents longitudinally) a kind of concrete limited expansion rate proving installation, comprise die trial 1, longitudinally restraint device 2 and two displacement detectors 3, die trial 1 is provided with test trough 1-1, longitudinally restraint device 2 is placed in test trough 1-1, longitudinally restraint device 2 comprises two confinement plate 2-1 and reinforcing bar 2-2, two confinement plate 2-1 are fixedly connected with by reinforcing bar 2-2, also there are two flexible boards 4, and two flexible boards 4 are placed in test trough 1-1, and be close to two horizontal medial surfaces of test trough 1-1 respectively, two end faces of two confinement plate 2-1 offset with corresponding flexible board 4 respectively, and the top of two confinement plate 2-1 is equipped with longitudinally overhanging detection termination 2-1-1, two displacement detectors 3 offset with the corresponding termination 2-1-1 that detects.
Shown in Figure 1, in order conveniently to adjust clock gauge 3-2 before detection, described displacement detector 3 comprises fixed support 3-1, clock gauge 3-2 and lock-screw 3-3, the two ends of fixed support 3-1 are all by lock-screw 3-3 and die trial 1 top load, clock gauge 3-2 and fixed support 3-1 load, and clock gauge 3-2 offsets with detecting termination 2-1-1, and fixed support 3-1 can move in die trial 1, and locks by lock-screw 3-3.
Shown in Fig. 1,2, described flexible board 4 is polystyrene board, the sheet material that can certainly adopt other flexible materials to make.
Referring to Fig. 1, shown in 2, the utility model is the Testing apparatus of measuring concrete limited expansion rate, on horizontal two inwalls of test trough 1-1 that two flexible boards 4 are close to respectively to die trial 1, brushing one deck release agent on flexible board 4 again, preferably repave last layer polystyrene plastics film, the convenient demoulding from now on, longitudinal limiting device 2 is placed in test trough 1-1, then just can will between two of a longitudinal limiting device 2 limiting plate 2-1, build the concrete being stirred, concrete parcel reinforcing bar 2-2, carry out again concrete jolt ramming and strike off, after concrete hardening, just form concrete sample 5, whole die trial 1 is positioned in pond, then fixed support 3-1 is moved, adjust the initial position of clock gauge 3-2, locking lock-screw 3-3, water filling in past pond, until the just surface of submergence concrete sample 5 of water surface S, record the initial reading of clock gauge 3-2, treat concrete hardening to next test the length of time (test the length of time be the interval time of national Specification test), gather again the reading of clock gauge 3-2, and calculate concrete limited expansion rate, if detect the dry expansion rate of concrete sample 5, only the water in pond need be discharged.
The transversal shrinkage of concrete sample 5 of the present utility model in testing process and expansion can be not restricted, reason is that the transverse side of concrete sample 5 has flexible board 4, flexible board 4 can confined concrete test specimen 5 lateral expansion power, thereby more accurate in the time that displacement detector 3 detects the linear deformation of concrete sample 5, improve accuracy of detection; Concrete sample 5 is with mould test all the time, having overcome common test device needs concrete to reach the drawback that some strength can form removal be measured, can after completing, concreting start test, the spontaneous expansion (or contraction) early stage and the later stage of all-the-way tracking concrete is out of shape, in concrete formation, maintenance, measuring process, needn't move continually test specimen, also needn't test all at every turn and compare length with par, test procedure is greatly simplified, thereby can alleviate experimenter's working strength.
Certainly clock gauge 3-2 also can change photooptical data acquisition system into, can realize automatic collection and the record of concrete deformation data, exempts the trouble of artificial timing reading, improves measuring accuracy.
Claims (3)
1. a concrete limited expansion rate proving installation, comprise die trial (1), longitudinally restraint device (2) and two displacement detectors (3), die trial (1) is provided with test trough (1-1), longitudinally restraint device (2) is placed in test trough (1-1), longitudinally restraint device (2) comprises two confinement plates (2-1) and reinforcing bar (2-2), two confinement plates (2-1) are fixedly connected with by reinforcing bar (2-2), it is characterized in that: also there are two flexible boards (4), and two flexible boards (4) are placed in test trough (1-1), and be close to two horizontal medial surfaces of test trough (1-1) respectively, two end faces of two confinement plates (2-1) offset with corresponding flexible board (4) respectively, and the top of two confinement plates (2-1) is equipped with longitudinally overhanging detection termination (2-1-1), two displacement detectors (3) offset with the corresponding termination (2-1-1) of detecting.
2. concrete limited expansion rate proving installation according to claim 1, it is characterized in that: described displacement detector (3) comprises fixed support (3-1), clock gauge (3-2) and lock-screw (3-3), the two ends of fixed support (3-1) are all by lock-screw (3-3) and die trial (1) top load, clock gauge (3-2) and fixed support (3-1) load, and clock gauge (3-2) offsets with detection termination (2-1-1).
3. concrete limited expansion rate proving installation according to claim 1, is characterized in that: described flexible board (4) is polystyrene board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420063201.1U CN203720174U (en) | 2014-02-12 | 2014-02-12 | Concrete restrained expansion rate testing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420063201.1U CN203720174U (en) | 2014-02-12 | 2014-02-12 | Concrete restrained expansion rate testing device |
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| CN203720174U true CN203720174U (en) | 2014-07-16 |
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| CN201420063201.1U Expired - Fee Related CN203720174U (en) | 2014-02-12 | 2014-02-12 | Concrete restrained expansion rate testing device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391106A (en) * | 2014-12-09 | 2015-03-04 | 中国建筑材料科学研究总院 | Instrument for measuring restrained expansion rate and initial setting time of expansive concrete |
| CN104614507A (en) * | 2015-01-30 | 2015-05-13 | 武汉三源特种建材有限责任公司 | Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening |
| CN106526147A (en) * | 2016-11-30 | 2017-03-22 | 东南大学 | Device and method for measuring expansion performance of mortar or concrete under vertical semi-submerged condition |
| CN106771099A (en) * | 2016-12-16 | 2017-05-31 | 中国建筑材料科学研究总院 | Cement expansive material limited expansion rate measuring instrument and concrete mold device |
| CN107014346A (en) * | 2017-05-31 | 2017-08-04 | 济南大学 | The device tested suitable for the deformation after to theing cement solidifies |
| CN108181347A (en) * | 2018-02-02 | 2018-06-19 | 沈阳建筑大学 | A kind of chute type thermal expansion coefficient of concrete measuring device and measuring method |
| CN108535458A (en) * | 2018-04-16 | 2018-09-14 | 福州大学 | For the underwater continuous device and its application method for measuring concrete expansion rate waterborne |
| CN108775855A (en) * | 2018-07-16 | 2018-11-09 | 哈尔滨工业大学 | The measuring device of through-hole hoop strain during a kind of static crushing |
| CN108931215A (en) * | 2018-07-27 | 2018-12-04 | 山东大学 | Concrete length measuring instrument and application method |
| CN110118868A (en) * | 2019-04-18 | 2019-08-13 | 广州建筑产业研究院有限公司 | A kind of experimental rig and its test method of grouting material expansion rate |
| CN112557635A (en) * | 2020-11-16 | 2021-03-26 | 东南大学 | Embedded reinforced cement-based material self-contraction measuring device and using method thereof |
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2014
- 2014-02-12 CN CN201420063201.1U patent/CN203720174U/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391106B (en) * | 2014-12-09 | 2016-01-20 | 中国建筑材料科学研究总院 | A kind of expansive concrete limited expansion rate and presetting period analyzer |
| CN104391106A (en) * | 2014-12-09 | 2015-03-04 | 中国建筑材料科学研究总院 | Instrument for measuring restrained expansion rate and initial setting time of expansive concrete |
| CN104614507A (en) * | 2015-01-30 | 2015-05-13 | 武汉三源特种建材有限责任公司 | Determination method for restrained expansion rate and expansion rate of expansive concrete from plasticity to hardening |
| CN106526147B (en) * | 2016-11-30 | 2019-06-25 | 东南大学 | A kind of device and method that the expansion character measuring mortar or concrete under the conditions of vertical half soaks measures |
| CN106526147A (en) * | 2016-11-30 | 2017-03-22 | 东南大学 | Device and method for measuring expansion performance of mortar or concrete under vertical semi-submerged condition |
| CN106771099A (en) * | 2016-12-16 | 2017-05-31 | 中国建筑材料科学研究总院 | Cement expansive material limited expansion rate measuring instrument and concrete mold device |
| CN107014346A (en) * | 2017-05-31 | 2017-08-04 | 济南大学 | The device tested suitable for the deformation after to theing cement solidifies |
| CN107014346B (en) * | 2017-05-31 | 2023-02-21 | 济南大学 | Device suitable for deformation after cement solidifies is tested |
| CN108181347A (en) * | 2018-02-02 | 2018-06-19 | 沈阳建筑大学 | A kind of chute type thermal expansion coefficient of concrete measuring device and measuring method |
| CN108535458A (en) * | 2018-04-16 | 2018-09-14 | 福州大学 | For the underwater continuous device and its application method for measuring concrete expansion rate waterborne |
| CN108775855A (en) * | 2018-07-16 | 2018-11-09 | 哈尔滨工业大学 | The measuring device of through-hole hoop strain during a kind of static crushing |
| CN108775855B (en) * | 2018-07-16 | 2021-02-12 | 哈尔滨工业大学 | Measuring device for circumferential strain of through hole in static crushing process |
| CN108931215A (en) * | 2018-07-27 | 2018-12-04 | 山东大学 | Concrete length measuring instrument and application method |
| CN108931215B (en) * | 2018-07-27 | 2024-02-02 | 山东大学 | Concrete length measuring instrument and use method thereof |
| CN110118868A (en) * | 2019-04-18 | 2019-08-13 | 广州建筑产业研究院有限公司 | A kind of experimental rig and its test method of grouting material expansion rate |
| CN112557635A (en) * | 2020-11-16 | 2021-03-26 | 东南大学 | Embedded reinforced cement-based material self-contraction measuring device and using method thereof |
| CN112557635B (en) * | 2020-11-16 | 2023-10-27 | 东南大学 | Embedded reinforcement cement-based material self-shrinkage measuring device and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: City, Jiangsu work builds Science and Technology Ltd. Assignor: Changzhou Polytechnic College Contract record no.: 2015320010088 Denomination of utility model: Concrete restrained expansion rate testing device Granted publication date: 20140716 License type: Exclusive License Record date: 20150603 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140716 Termination date: 20160212 |
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| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: City, Jiangsu work builds Science and Technology Ltd. Assignor: Changzhou Polytechnic College Contract record no.: 2015320010088 Date of cancellation: 20190103 |