CN102590485B - Framework-type concrete self-constriction measurement device - Google Patents
Framework-type concrete self-constriction measurement device Download PDFInfo
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- CN102590485B CN102590485B CN201210049889.3A CN201210049889A CN102590485B CN 102590485 B CN102590485 B CN 102590485B CN 201210049889 A CN201210049889 A CN 201210049889A CN 102590485 B CN102590485 B CN 102590485B
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- type container
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- constriction
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- 238000005259 measurement Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 5
- 239000010935 stainless steel Substances 0.000 claims abstract description 5
- 238000000465 moulding Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011545 laboratory measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007573 shrinkage measurement Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention relates to a framework-type concrete self-constriction measurement device, and can be used for solving the problems of unreal data of a measured constriction value and errors which are caused by influence of template restriction on concrete during measurement of the concrete self-constriction value in the conventional laboratory. Two supporting columns are fixedly arranged on a base; two short shafts are respectively fixed in the middle of the left side and the right side of a framework; a frustum-shaped container is a stainless steel frustum-shaped container, of which the inner wall is smooth; freshly mixed concrete is filled in the frustum-shaped container; an upper cover and a lower cover are respectively covered at the upper end and the lower end of the frustum-shaped container; a steel sheet is embedded at each of the upper end and the lower end of the freshly mixed concrete; two sensors are respectively inserted and fixedly arranged on an upper beam and a lower beam of the framework; each sensor is opposite to the central holes of the upper cover and the lower cover; a gap is reserved between each steel sheet and each sensor; and the sensors are eddy current displacement sensors. The device is suitable to measure the concrete self-constriction in the laboratory.
Description
Technical field
The present invention relates to a kind of concrete shrinkage and survey device, be specifically related to a kind of framework-type concrete self-constriction measurement device.
Background technology
Self-constriction refers to the minimizing of cement-based material apparent volume or length under the condition of sealed maintenance, isothermal, and chemical shrinkage is the reason that causes self-constriction; Condensing is a part for self-constriction, occurs in the moulding stage; Self-desiccation shrinkage is a part for self-constriction, is also a most important part.Because the structure formation time of cement slurry is still difficult to provide clear and definite judgement (end in moulding stage) at present, the test duration of therefore a lot of self-constrictions is during from initial set, also has that 1 day starts from building moulding.And within 1 day, test after initial set or after building moulding, condensing part has been left in the basket, and the result now recording has affected the accuracy of self-constriction greatly.Domestic scholars proposes concrete self-shrinkage to carry out areal survey: adopt vertical metering system and non-contact sensor can make condensing test initial time after building moulding, start ahead of time; Adopt the rectangular formula of horizontal survey and non-contact sensor can test 1 day self-desiccation shrinkage in the past; Adopt vertical clock gauge can test later long-age self-constriction in 1 day.Although the method can effectively solve condensing measurement problem, need to distinguish moulding for measuring condensing test specimen and the test specimen of self-desiccation shrinkage, and all need separately non-contact sensor to monitor.
In addition, usual method at laboratory measurement concrete self-shrinkage is: at a rectangular parallelepiped both mold ends end built-in metal post, after casting concrete, with plastic sheeting parcel, cover, subsequently by the non-contacting measuring method of miking or non-contact sensor, measure the displacement of metal column, can measure the linear contraction amount of rectangular parallelepiped concrete sample.The mould of this measurement concrete shrinkage is rectangular parallelepiped, in concrete coagulation hardening process, the side template of surrounding and base plate all can produce certain constraining force to concrete, hinder concrete contraction, the data of the shrinkage value of measuring are in this case false, and domestic correlative study also confirms that side template causes the measuring error of self-constriction very large.
Summary of the invention
The object of the invention is to be vulnerable in order to solve concrete in existing laboratory measurement concrete self-shrinkage amount process the impact of template effect of contraction, the data that cause measuring shrinkage value are untrue, the problems such as error that produce, and then a kind of framework-type concrete self-constriction measurement device is provided.
Technical scheme of the present invention is: framework-type concrete self-constriction measurement device comprises base and two pillars, the upper end of each pillar has groove, two parallel being packed on base of pillar, described framework-type concrete self-constriction measurement device also comprises framework, upper cover, lower cover, taper type container, two minor axises, two floors, two steel discs and two sensors, two minor axises are packed in respectively the middle part of framework left and right sides outer wall, and two minor axises are rotatably installed in respectively in the groove of two pillar upper ends, taper type container is the stainless steel taper type container of inner wall smooth, taper type container is arranged in framework, and affixed by two floors between the left and right sides of taper type container and framework, in taper type container, fill up fresh concrete, the center of upper cover and lower cover all has a center pit, and upper cover and lower cover mount cover respectively the two ends up and down at taper type container, each pre-buried steel disc of the two ends up and down of fresh concrete, and the position of steel disc is relative with the center pit of upper cover and lower cover, two sensors wear respectively and are packed on the upper beam and underbeam of framework, each sensor is all relative with the center pit of upper cover and lower cover, and leave gap between each steel disc and each sensor, sensor is eddy displacement sensor.
The present invention compared with prior art has following effect: 1. the stainless steel taper type container that taper type container of the present invention is inner wall smooth, there is no corner angle, and the frictional resistance being subject to during concrete shrinkage is little; 2. taper type container of the present invention is along with framework can arbitrarily angledly overturn, measure when condensing, taper type container and framework are fixed on vertical position, can change at any time the spatial attitude of taper type container subsequently, as: the horizontal or vertical placement of taper type container and framework, rotate 90 degree or 180 degree, effectively avoided the gravity of fresh concrete and the measuring error producing with the constraining force of template, measured self-shrinking value is more accurate; 3. eddy displacement sensor of the present invention can accurately be measured the poor of concrete displacement, and concrete shrinkage value, has compensated the impact of environment temperature on vortex sensor measuring error, has guaranteed the measuring accuracy of concrete shrinkage value; 4. of the present invention simple in structure, be easy to realize, production cost is low, applied widely.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, the frame concrete contraction measuring device of present embodiment comprises base 1 and two pillars 2, the upper end of each pillar 2 has groove 2-1, two parallel being packed on base 1 of pillar 2, described framework-type concrete self-constriction measurement device also comprises framework 3, upper cover 9, lower cover 10, taper type container 11, two minor axises 4, two floors 5, two steel discs 7 and two sensors 8, two minor axises 4 are packed in respectively the middle part of framework 3 left and right sides outer walls, and two minor axises 4 are rotatably installed in respectively in the groove 2-1 of two pillar 2 upper ends, the stainless steel taper type container that taper type container 11 is inner wall smooth, taper type container 11 is arranged in framework 3, and affixed by two floors 5 between the left and right sides of taper type container 11 and framework 3, in taper type container 11, fill up fresh concrete, upper cover 9 and lower cover 10 center all have a center pit, and upper cover 9 and lower cover 10 mount cover respectively the two ends up and down at taper type container 11, each pre-buried steel disc 7 of the two ends up and down of fresh concrete, and the position of steel disc 7 is relative with the center pit of upper cover 9 and lower cover 10, two sensors 8 wear respectively and are packed on the upper beam and underbeam of framework 3, each sensor 8 is all relative with the center pit of upper cover 9 and lower cover 10, and leave gap between each steel disc 7 and each sensor 8, sensor 8 is eddy displacement sensor.
Embodiment two: in conjunction with Fig. 1, present embodiment is described, the framework-type concrete self-constriction measurement device of present embodiment also comprises two fins 6, and the middle part of taper type container 11 is welded with two fins 6, and each fin 6 is respectively on a floor 5.So arrange, each fin 6 is packed on a floor 5 by screw respectively, effectively raises the strength of joint between taper type container 11 and framework 3, be easy to handling, be convenient to carrying out smoothly of concrete shrinkage measurement, meanwhile, also improved serviceable life of the present invention.Other composition and annexation are identical with embodiment one.
The course of work of the present invention is:
In taper type container, fill up fresh concrete, first adjust framework and taper type container is vertical position, the large diameter bottom of taper type container below, the top of minor diameter is up.Adjust the gap between eddy displacement sensor and steel disc, by voltage signal input instrument or the computing machine of eddy displacement sensor output.Concrete, in the plastic stage, keeps framework and the vertical transfixion of taper type container always, and the now variation in the gap between the measured sensor of eddy displacement sensor and steel disc, is concrete condensing.After concrete initial set, the upset that framework and taper type container can regularly forward and reverse (0-180 degree), when unmeasured, framework and taper type container keep horizontal positioned (needing two simple beams by frame supported), during measurement, framework and taper type container are vertical position, and guarantee that termination that diameter is little up, now, measured concrete deformation is the self-constriction after setting and harden.This installs measured concrete self-shrinkage and utilizes same test specimen, same measurement mechanism, from concrete formation constantly, realize the concrete self-shrinkage measurement of (comprising the condensing of plastic stage).
Claims (2)
1. a framework-type concrete self-constriction measurement device, it comprises base (1) and two pillars (2), the upper end of each pillar (2) has groove (2-1), two pillars (2) are parallel to be packed on base (1), it is characterized in that: described framework-type concrete self-constriction measurement device also comprises framework (3), upper cover (9), lower cover (10), taper type container (11), two minor axises (4), two floors (5), two steel discs (7) and two sensors (8), two minor axises (4) are packed in respectively the middle part of framework (3) left and right sides outer wall, and two minor axises (4) are rotatably installed in respectively in the groove (2-1) of two pillars (2) upper end, the stainless steel taper type container that taper type container (11) is inner wall smooth, taper type container (11) is arranged in framework (3), and affixed by two floors (5) between the left and right sides of taper type container (11) and framework (3), taper type container fills up fresh concrete in (11), the center of upper cover (9) and lower cover (10) all has a center pit, and upper cover (9) and lower cover (10) mount cover respectively the two ends up and down at taper type container (11), each pre-buried steel disc (7) of the two ends up and down of fresh concrete, and the position of steel disc (7) is relative with the center pit of upper cover (9) and lower cover (10), two sensors (8) wear respectively and are packed on the upper beam and underbeam of framework (3), each sensor (8) is all relative with the center pit of upper cover (9) and lower cover (10), and leave gap between each steel disc (7) and each sensor (8), sensor (8) is eddy displacement sensor.
2. framework-type concrete self-constriction measurement device according to claim 1, it is characterized in that: described framework-type concrete self-constriction measurement device also comprises two fins (6), the middle part of taper type container (11) is welded with two fins (6), and each fin (6) is packed in respectively on a floor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210049889.3A CN102590485B (en) | 2012-02-29 | 2012-02-29 | Framework-type concrete self-constriction measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210049889.3A CN102590485B (en) | 2012-02-29 | 2012-02-29 | Framework-type concrete self-constriction measurement device |
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| Publication Number | Publication Date |
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| CN102590485A CN102590485A (en) | 2012-07-18 |
| CN102590485B true CN102590485B (en) | 2014-11-05 |
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| CN201210049889.3A Expired - Fee Related CN102590485B (en) | 2012-02-29 | 2012-02-29 | Framework-type concrete self-constriction measurement device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103175483B (en) * | 2013-03-13 | 2015-10-28 | 哈尔滨工业大学 | A kind of handheld apparatus and method measuring cement road surface plate buckling deformation amount |
| CN109856374B (en) * | 2018-12-26 | 2022-02-22 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Concrete self-shrinkage test method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001141724A (en) * | 1999-11-12 | 2001-05-25 | Taiheiyo Cement Corp | Self-shrinkage measuring device for cement-based material |
| DE10123663A1 (en) * | 2001-05-15 | 2001-11-15 | Markus Greim | Device for measuring deformation of mortar in two directions under different temperature conditions has sensors for simultaneous measurement of vertical and horizontal mortar movement |
| CN1558234A (en) * | 2004-02-05 | 2004-12-29 | 哈尔滨工业大学 | Measuring device for concrete shrinkage and stress |
| CN1844850A (en) * | 2006-03-16 | 2006-10-11 | 江苏博特新材料有限公司 | Method and apparatus for testing early self-deformation of concrete |
| CN200979544Y (en) * | 2006-11-03 | 2007-11-21 | 北京工业大学 | A cement concrete autogenous-shrinkage ratio detector |
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- 2012-02-29 CN CN201210049889.3A patent/CN102590485B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001141724A (en) * | 1999-11-12 | 2001-05-25 | Taiheiyo Cement Corp | Self-shrinkage measuring device for cement-based material |
| DE10123663A1 (en) * | 2001-05-15 | 2001-11-15 | Markus Greim | Device for measuring deformation of mortar in two directions under different temperature conditions has sensors for simultaneous measurement of vertical and horizontal mortar movement |
| CN1558234A (en) * | 2004-02-05 | 2004-12-29 | 哈尔滨工业大学 | Measuring device for concrete shrinkage and stress |
| CN1844850A (en) * | 2006-03-16 | 2006-10-11 | 江苏博特新材料有限公司 | Method and apparatus for testing early self-deformation of concrete |
| CN200979544Y (en) * | 2006-11-03 | 2007-11-21 | 北京工业大学 | A cement concrete autogenous-shrinkage ratio detector |
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| CN102590485A (en) | 2012-07-18 |
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