CN101245991A - Concrete early deformation non-contact test method and device - Google Patents
Concrete early deformation non-contact test method and device Download PDFInfo
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- CN101245991A CN101245991A CNA200810069357XA CN200810069357A CN101245991A CN 101245991 A CN101245991 A CN 101245991A CN A200810069357X A CNA200810069357X A CN A200810069357XA CN 200810069357 A CN200810069357 A CN 200810069357A CN 101245991 A CN101245991 A CN 101245991A
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Abstract
The invention relates to a non-contact testing method of early concrete deformation, which essentially comprises the following steps: isolation layer processing that reduces friction is implemented between tried molds in the concrete domain when tried molds are built; a light embedded part with a reflection target is respectively arranged at a position close to an end part in the length direction or/and the width direction of the tried molds when casting is implemented; the detection of concrete blocks in the tried molds can be implemented by a laser offset sensor after the casting. The invention further comprises a non-contact testing device of early concrete deformation. With the non-contact testing method and device of early concrete deformation, the invention implements the full-process concrete measurement of ultra-early plastic shrinkage, coagulation and induration, solves the problem of automatic and continuous full-process concrete and mortar shrinkage detection, and has the advantages of convenience, reliability, continuity and precision.
Description
Affiliated technical field
The present invention relates to the monitoring method and the device of civil engineering material distortion, specifically is a kind of method and device of concrete early deformation non-contact testing.
Background technology
The early stage spontaneous deformation measurement method that Japan self-constriction research committee proposes.The shortcoming one of this method is that test specimen needs the form removal sealing behind the 1d, is subjected to the effect of contraction of encapsulant, and the shrinkage value of mensuration may be less than normal; The 2nd, reckon without the temperature deformation that hydration heat causes, make that measured value may be bigger than normal; The 3rd, only a horizontal direction is measured distortion, makes that measured value may be less than normal, and this is because the early stage sedimentation of concrete is converted into the horizontal direction distortion.These deficiencies make measured value and to fail the concrete spontaneous distortion of true reflection big or small.
The method that strainometer is imbedded in the middle suggestion of China's " concrete for hydraulic structure testing regulations " is measured concrete autogenous distortion.Weak point is that early concrete does not still have enough intensity (initial set is to final set), and strainometer and concrete can not deform in same pace, therefore can't accurately measure early stage spontaneous deformation values, and this obviously is not suitable for high performance concrete.This in addition strainometer is the price height not only, and can't reuse, the experimentation cost height.
On the basis of contrast and the assay method of analyzing relevant concrete autogenous distortion both at home and abroad, though think that some method that can at utmost measure spontaneous distortion is that researchist institute generally adopts, but owing to do not form standard, they lack consistent at aspects such as equipment selection, test operations, this makes that the comparability between the similar research is relatively poor.Therefore, set up very necessity of convenient, reliable, continuous concrete early deformation assay method.
The content of invention
First purpose of the present invention provides a kind of concrete early deformation non-contact test method, conveniently, reliably, continuously, accurately to measure concrete early deformation.Another object of the present invention provides a kind of concrete early deformation non-contact testing device
First purpose of the present invention is to realize that by such technical scheme promptly a kind of concrete early deformation non-contact test method said method comprising the steps of:
1, concrete raw material sand, stone, cement, additive, the mineral admixture that measures added stirring machine simultaneously, do earlier and stirred 2 minutes 45 seconds, add the water that measures, continue to stir 135 seconds, stop to stir;
2, concrete die trial bottom surface is placed the special Furon of one deck earlier, and wipe a spot of talcum powder, spread plastic sheeting in side and bottom surface then;
3, concrete divides two layers to be poured in the ready prepd concrete die trial, before cast or behind the cast ground floor, at described die trial length direction or/and place, the close end of Width respectively has a lightweight built-in fitting, the bar of extending of built-in fitting stretches out die trial, its end is the reflecting target of laser displacement sensor, and vibration makes the concrete test body closely knit on concrete vibrating stand again;
4, adjusting the die trial position beats on the reflecting target of two ends the laser vertical of laser displacement sensor, the axial displacement of reflecting target is by the laser displacement sensor perception, data message is presented at digital display meter, or by being sent to computing machine, realizes measurement result is carried out the timing acquiring of data.
Another object of the present invention is achieved through the following technical solutions, a kind of concrete early deformation non-contact testing device, comprise die trial, computing machine and connected laser displacement sensor, it is characterized in that: described die trial at length direction or/and Width respectively has a lightweight built-in fitting near end place, the bar of extending of built-in fitting stretches out die trial, and its end is the reflecting target of laser displacement sensor.
The present invention has solved the problem that energy automatic continuous detecting concrete of overall process and mortar shrink because described method and apparatus has been realized the measurement of concrete utmost point early-age plastic shrinkage and setting and harden overall process.Its advantage that has is: convenient, reliable, continuous, accurate.
Description of drawings
The embodiment of the indefiniteness that the present invention can provide by accompanying drawing further specifies.
Fig. 1 is a structure cut-open view of the present invention;
Fig. 2 is figure A-A cut-open view
Fig. 3 is the structure cut-open view of another embodiment;
Fig. 4 is the ultimate principle figure of triangle reflectometry.
Among the figure: 1, die trial; 2, plastic film layers; 3, lightweight gauge head; 4, special Furon layer; 5, concrete sample; 6, computing machine; 7, laser displacement sensor; 8, the bar of extending.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
A kind of concrete early deformation non-contact test method said method comprising the steps of:
1, concrete raw material sand, stone, cement, additive, the mineral admixture that measures added stirring machine simultaneously, do earlier and stirred 2 minutes 45 seconds, add the water that measures, continue to stir 135 seconds, stop to stir;
2, concrete die trial bottom surface is placed the special Furon of one deck earlier, and wipe a spot of talcum powder, spread plastic sheeting in side and bottom surface then; (referring to accompanying drawing 2)
3, concrete divides two layers to be poured in the ready prepd concrete die trial, before cast or behind the cast ground floor, at described die trial length direction or/and place, the close end of Width respectively has a lightweight built-in fitting, the bar of extending of built-in fitting stretches out die trial, its end is the reflecting target of laser displacement sensor, and vibration makes the concrete test body closely knit on concrete vibrating stand again;
4, adjusting the die trial position beats on the reflecting target of two ends the laser vertical of laser displacement sensor, the axial displacement of reflecting target is reflected by the difference of laser displacement sensor by current spacing and initial separation, reading can be accurate to 0.1 μ m, the realization online in real time is measured, data message is presented at digital display meter, also can conveniently carry out the timing acquiring of data with data by being connected of RS232 interface and computing machine to measurement result.
Referring to accompanying drawing, the concrete deformation non-contact testing device among the figure comprises die trial 1, computing machine 6 and connected laser displacement sensor 7; Wherein: described die trial respectively has a lightweight built-in fitting 3 at length direction near the place, end, and the bar 8 of extending of built-in fitting stretches out die trial, and the end of the bar of extending is the reflecting target of laser displacement sensor.
In the embodiment that Fig. 1 provides, die trial respectively has a circular hole at the center, two sides of length direction, and the bar of extending of built-in fitting is drawn by circular hole.Described lightweight built-in fitting 3 is connected for the T type with the bar 8 of extending.
In the embodiment that accompanying drawing 2 provides, the bar of extending of built-in fitting is upwards drawn.
The sectional dimension that the above-mentioned bar of extending stretches out the end of die trial is slightly larger than the sectional dimension of the body of rod itself.Constitute the reflecting target of laser displacement sensor.
In the accompanying drawing as seen: the bottom of die trial has special Furon layer 4, talcum bisque and plastic film layers 2 from bottom to top, has plastic film layers in the side of die trial.
Said apparatus adopts is non-contact measurement completely, and laser displacement sensor does not have acting force to measured body, and this has just reflected the true strain situation of measured body really; Have advantages of higher stability and precision, adapt to the measurement under the severe environmental conditions, the environmental baseline fluctuation does not almost have influence, and this has just strengthened versatility and has improved work efficiency; Can realize that online in real time measures, data message can be presented at digital display meter, also can be connected with the RS232 interface of computing machine, just can conveniently carry out the timing acquiring of data to measurement result, this with regard to convenient and swift, can be continuous and reusable, reduced experimentation cost.
Referring to accompanying drawing 3, the basic functional principle of the utility model laser testing: utilize the optical principle Displacement Measurement, the triangle reflectometry is be most widely used a kind of, and laser displacement sensor utilizes this principle of work just.The most basic structure of triangle reflectometry is the single reception form of single transmit, and the reception form of measuring light is for diffusing.The light beam that laser instrument sends focuses on the measured surface S through lamp optical system, and diffusing of measured surface is received the lens seizure and is the luminous point imaging last focusing of image-forming objective lens (as the CCD element).The position of imaging luminous point on CCD is the function of gauge head (lasing light emitter reflection place) and measured surface distance, when tested surface is toward or away from gauge head, the imaging light spot position will produce transversal displacement on CCD, just can try to achieve the variation that object shows displacement by the change in displacement that detects its picture point.Can get displacement δ by geometrical optics calculating
2With picture point δ
1Between relation:
θ is the angle of projection optical axis and imaging objective lens optical axis in the formula, by design decision; φ is the angle of CCD and imaging objective lens optical axis.Work as δ
2Change very little, promptly under the situation of little displacement (1) but the formula approximate representation be
(2) formula illustrates in little displacement measurement, δ
2～δ
1Can handle by linear relationship.But in actual measurement, by (1) formula δ as can be known
2～δ
1And nonlinear relationship.In triangulation, can increase the conjugate distance of imaging object lens by dwindling measurement range, increase the angle of triangulation system, dwindle the enlargement ratio of imaging object lens, reach the measurement result of approximately linear.By signal processor the variation of image point displacement is changed into current signal output at last.
The laser displacement sensor that the present invention adopts is commercially available high-precision laser displacement transducer, as LK-G series or the like.Computer-processing software based on above-mentioned measuring principle provides by producer is supporting.
Claims (7)
1, a kind of concrete early deformation non-contact test method said method comprising the steps of:
1), the concrete raw material sand with measuring, stone, cement, additive, mineral admixture adds stirring machine simultaneously, does earlier and stirs 2 minutes 45 seconds, adds the water that measures, and continues to stir 135 seconds, stop to stir;
2), the special Furon of one deck is placed earlier in concrete die trial bottom surface, and wipe a spot of talcum powder, spread plastic sheeting in side and bottom surface then;
3), concrete divides two layers to be poured in the ready prepd concrete die trial, before cast or behind the cast ground floor, at described die trial length direction or/and place, the close end of Width respectively has a lightweight built-in fitting, the bar of extending of built-in fitting stretches out die trial, its end is the reflecting target of laser displacement sensor, and vibration makes the concrete test body closely knit on concrete vibrating stand again;
4), adjusting the die trial position beats on the reflecting target of two ends the laser vertical of laser displacement sensor, the axial displacement of reflecting target is by the laser displacement sensor perception, data message is presented at digital display meter, or by being sent to computing machine, realizes measurement result is carried out the timing acquiring of data.
2, a kind of concrete early deformation non-contact testing device comprises die trial (1), computing machine (6) and connected laser displacement sensor; It is characterized in that: or/and the place, close end of Width respectively has a lightweight built-in fitting (3), the bar of extending (8) of built-in fitting stretches out die trial at length direction in described die trial, and its end is the reflecting target of laser displacement sensor.
3, concrete early deformation non-contact testing device according to claim 2 is characterized in that: die trial length is or/and the center, two sides of Width respectively has a circular hole, and the bar of extending of built-in fitting is drawn by circular hole.
4, concrete early deformation non-contact testing device according to claim 2, it is characterized in that: the bar of extending of built-in fitting is upwards drawn.
5, according to claim 2 or 3 or 4 described concrete early deformation non-contact testing devices, it is characterized in that: the bottom of die trial has special Furon layer (4), talcum bisque and plastic film layers (2) from bottom to top, has plastic film layers in the side of die trial.
6, concrete early deformation non-contact testing device according to claim 3 is characterized in that: described lightweight built-in fitting (3) is connected for the T type with the bar of extending (8).
7, according to claim 2 or 3 or 4 or 6 described concrete early deformation non-contact testing devices, it is characterized in that: the sectional dimension that the bar of extending stretches out the end of die trial is slightly larger than the sectional dimension of the body of rod itself.
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| CNA200810069357XA CN101245991A (en) | 2008-02-04 | 2008-02-04 | Concrete early deformation non-contact test method and device |
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| CNA200810069357XA CN101245991A (en) | 2008-02-04 | 2008-02-04 | Concrete early deformation non-contact test method and device |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813610A (en) * | 2010-04-15 | 2010-08-25 | 河海大学 | Testing device of volume compression coefficient of freshly mixed concrete under side-limit condition and testing method thereof |
| CN101865865A (en) * | 2010-06-12 | 2010-10-20 | 水利部交通运输部国家能源局南京水利科学研究院 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
| CN102072704A (en) * | 2010-11-11 | 2011-05-25 | 清华大学 | Non-contact laser displacement measurement system used for cement-based materials |
| CN102175125A (en) * | 2011-03-14 | 2011-09-07 | 中国建筑第八工程局有限公司 | Detection method for measuring accuracy of concrete temperature restraint strain by using vibrating string strain meter |
| CN103837670A (en) * | 2013-12-27 | 2014-06-04 | 河海大学 | Method and apparatus for measuring early-stage autogenous shrinkage of cement-based material |
| CN105773840A (en) * | 2016-04-08 | 2016-07-20 | 安庆市星博特电子科技有限公司 | Built-in trial run trial and mold test frame for concrete vibrating stand |
| CN106093358A (en) * | 2016-07-08 | 2016-11-09 | 清华大学 | Can directly measure concrete temperature stress testing machine and the method for concrete deformation |
| CN107328922A (en) * | 2017-08-28 | 2017-11-07 | 哈尔滨工业大学 | The test device that foam concrete volume is deformed under the conditions of a kind of steam curing |
| US9891208B2 (en) | 2016-07-08 | 2018-02-13 | Tsinghua University | Concrete temperature stress testing machine system and concrete temperature stress testing method |
| CN108716893A (en) * | 2018-07-19 | 2018-10-30 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of contactless concrete autogenous volumetric deformation test method and test device |
| CN109458925A (en) * | 2019-01-04 | 2019-03-12 | 中南大学 | Deformation dynamics test device and method of the cement-based material during thermal curing |
| CN109991263A (en) * | 2019-04-08 | 2019-07-09 | 上海市市政规划设计研究院有限公司 | The contraction test method of ultra-high performance concrete |
| CN110595378A (en) * | 2019-10-17 | 2019-12-20 | 中煤科工集团重庆研究院有限公司 | Real-time ground surface or slope deformation monitoring device and method based on laser ranging principle |
| CN110646393A (en) * | 2019-10-14 | 2020-01-03 | 哈尔滨工业大学 | Device and method for testing expansion stress and deformation distribution of foam concrete |
| CN113029032A (en) * | 2021-03-26 | 2021-06-25 | 中南大学 | High-precision surface shape measuring method and device based on spectrum confocal |
| CN114034846A (en) * | 2021-10-13 | 2022-02-11 | 嘉华特种水泥股份有限公司 | Non-contact concrete shrinkage deformation tester and application method thereof |
| CN116148452A (en) * | 2023-04-20 | 2023-05-23 | 山东高速明董公路有限公司 | Cement stabilized macadam volume shrinkage measuring device |
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2008
- 2008-02-04 CN CNA200810069357XA patent/CN101245991A/en active Pending
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813610A (en) * | 2010-04-15 | 2010-08-25 | 河海大学 | Testing device of volume compression coefficient of freshly mixed concrete under side-limit condition and testing method thereof |
| CN101813610B (en) * | 2010-04-15 | 2015-04-29 | 河海大学 | Testing device of volume compression coefficient of freshly mixed concrete under side-limit condition and testing method thereof |
| CN101865865A (en) * | 2010-06-12 | 2010-10-20 | 水利部交通运输部国家能源局南京水利科学研究院 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
| CN101865865B (en) * | 2010-06-12 | 2011-12-28 | 水利部交通运输部国家能源局南京水利科学研究院 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
| CN102072704A (en) * | 2010-11-11 | 2011-05-25 | 清华大学 | Non-contact laser displacement measurement system used for cement-based materials |
| CN102072704B (en) * | 2010-11-11 | 2012-09-05 | 清华大学 | Non-contact laser displacement measurement system used for cement-based materials |
| CN102175125A (en) * | 2011-03-14 | 2011-09-07 | 中国建筑第八工程局有限公司 | Detection method for measuring accuracy of concrete temperature restraint strain by using vibrating string strain meter |
| CN103837670A (en) * | 2013-12-27 | 2014-06-04 | 河海大学 | Method and apparatus for measuring early-stage autogenous shrinkage of cement-based material |
| CN105773840A (en) * | 2016-04-08 | 2016-07-20 | 安庆市星博特电子科技有限公司 | Built-in trial run trial and mold test frame for concrete vibrating stand |
| US10060901B2 (en) | 2016-07-08 | 2018-08-28 | Tsinghua University | Concrete temperature stress testing machine system and temperature deformation self-compensation method |
| US9891208B2 (en) | 2016-07-08 | 2018-02-13 | Tsinghua University | Concrete temperature stress testing machine system and concrete temperature stress testing method |
| CN106093358A (en) * | 2016-07-08 | 2016-11-09 | 清华大学 | Can directly measure concrete temperature stress testing machine and the method for concrete deformation |
| CN107328922A (en) * | 2017-08-28 | 2017-11-07 | 哈尔滨工业大学 | The test device that foam concrete volume is deformed under the conditions of a kind of steam curing |
| CN108716893A (en) * | 2018-07-19 | 2018-10-30 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of contactless concrete autogenous volumetric deformation test method and test device |
| CN108716893B (en) * | 2018-07-19 | 2024-05-07 | 水利部交通运输部国家能源局南京水利科学研究院 | Non-contact concrete autogenous volume deformation testing method and testing device |
| CN109458925A (en) * | 2019-01-04 | 2019-03-12 | 中南大学 | Deformation dynamics test device and method of the cement-based material during thermal curing |
| CN109458925B (en) * | 2019-01-04 | 2020-08-14 | 中南大学 | Dynamic deformation testing method for cement-based material in thermal curing process |
| 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 |
| CN109991263A (en) * | 2019-04-08 | 2019-07-09 | 上海市市政规划设计研究院有限公司 | The contraction test method of ultra-high performance concrete |
| CN110646393A (en) * | 2019-10-14 | 2020-01-03 | 哈尔滨工业大学 | Device and method for testing expansion stress and deformation distribution of foam concrete |
| CN110595378A (en) * | 2019-10-17 | 2019-12-20 | 中煤科工集团重庆研究院有限公司 | Real-time ground surface or slope deformation monitoring device and method based on laser ranging principle |
| CN113029032A (en) * | 2021-03-26 | 2021-06-25 | 中南大学 | High-precision surface shape measuring method and device based on spectrum confocal |
| CN114034846A (en) * | 2021-10-13 | 2022-02-11 | 嘉华特种水泥股份有限公司 | Non-contact concrete shrinkage deformation tester and application method thereof |
| CN114034846B (en) * | 2021-10-13 | 2023-09-01 | 嘉华特种水泥股份有限公司 | Non-contact concrete shrinkage deformation tester and use method thereof |
| CN116148452A (en) * | 2023-04-20 | 2023-05-23 | 山东高速明董公路有限公司 | Cement stabilized macadam volume shrinkage measuring device |
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