CN106226506A - The system of detection prestressed reinforced concrete construction corrosive crack and aggregate manufacture method - Google Patents
The system of detection prestressed reinforced concrete construction corrosive crack and aggregate manufacture method Download PDFInfo
- Publication number
- CN106226506A CN106226506A CN201610684698.2A CN201610684698A CN106226506A CN 106226506 A CN106226506 A CN 106226506A CN 201610684698 A CN201610684698 A CN 201610684698A CN 106226506 A CN106226506 A CN 106226506A
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- Prior art keywords
- housing
- reinforced concrete
- signal
- concrete construction
- prestressed reinforced
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention discloses a kind of system detecting prestressed reinforced concrete construction corrosive crack and aggregate manufacture method, wherein this system includes: intelligent aggregate, signal are launched and data acquisition hardware system, signal control and data processing software.The present invention mainly utilizes the characteristic of piezoelectricity two tropism of piezoelectric ceramics, makes the intelligent aggregate being applicable to durability monitoring, by the change of energy, is monitored corrosive crack differentiating.The distinguishing features such as the present invention has with low cost, simple and quick, and accuracy rate is high, are highly suitable for the corrosive crack detection of high performance for concrete structure.
Description
Technical field
The present invention relates to civil engineering works structure health monitoring technical field, particularly a kind of detection prestressed reinforced concrete construction
The system of corrosive crack and aggregate manufacture method.
Background technology
High performance concrete is a kind of novel High Technique Concrete, is significantly to carry by adding the means such as fine mineral admixture
Its concrete performance high, and use the concrete of modern concrete fabrication techniques；It is using durability as its major design index
While, and have the feature of high workability, high volume stability and economy simultaneously.Reinforcing bar (including presstressed reinforcing steel) corrosion simultaneously
Problem is also to cause the main cause of durability damage, and therefore steel bar corrosion monitors for prestressing force high performance for concrete structure
Durability is particularly important.After reinforcing bar (including presstressed reinforcing steel) occurs corrosion, its corrosion product volume can reach the 2～6 of original volume
Times, thus a splitting stresses centered by reinforcing bar (including presstressed reinforcing steel) can be produced, once protective layer is split up and produces and split
Seam, it will accelerate the corrosion of reinforcing bar (including presstressed reinforcing steel).For presstressed reinforcing steel, the generation of on the one hand corrosion can reduce it
Net sectional area thus cause prestressed loss；Still further aspect corrosion product produces at presstressed reinforcing steel and high performance concrete
Between reduce conjugation between the two, thus cause its prestressed loss.Traditional measuring technology has ultrasound wave, sound to send out
Penetrate, the technology such as grating, how much there is the shortcomings such as volume is big, operation is difficult to, the most affected by environment and strongly professional, nothing in these technology
Method meets the requirement that corrosive crack is monitored in time, and the generation of corrosive crack is produced often from inside to outside, and traditional method is the most very
The difficult generation finding crack in time.
The existing correlational study of health test apparatus based on intelligent aggregate in prior art, such as patent No. ZL201210443143
Disclose a kind of xoncrete structure health monitoring systems based on piezoelectric intelligent aggregate.Its workflow is: sensor subsystem
Treated the related physical quantity of geodesic structure by sensor senses, then various kinds of sensors signal is controlled by data acquisition subsystem
Data acquisition platform realizes gathering and the preliminary treatment of signal, upload the data to Surveillance center by communication system, at prison
The further process that control center then completes, such as filtering, non-destructive tests, safe early warning and data storage function.
The health test apparatus based on intelligent aggregate of prior art and method thereof suffer from the drawback that due to coagulation soil cracking
The mode that seam produces has the particular location that multiformity causes it to produce and there is also randomness, and existing device and method can only
Judge whether crack occurs qualitatively, the extent of injury in crack can not be judged, and not there is specific aim, therefore invention one
Kind is specifically designed for the detecting system of corrosive crack and is necessary.Existing intelligent aggregate detection technique generally require perhaps
Multiple instruments, and line is cumbersome, is unfavorable for Site Detection.The most existing intelligent aggregate detecting system can't be existing in detection
The limitation that field is analyzed in real time.Hardware and software integral system.
Summary of the invention
The technical problem to be solved is, not enough for prior art, it is provided that a kind of detection prestressed concrete
The system of structure corrosive crack and aggregate manufacture method.
For solving above-mentioned technical problem, the technical solution adopted in the present invention is: a kind of detection prestressed reinforced concrete construction
The system of corrosive crack, including:
Intelligent aggregate；
Signal is launched and data collecting system: be used for driving described intelligent aggregate to launch sine sweep signal；
Signal controls and processing system: is used for controlling described signal and launches and data collecting system work,
And calculate durable index according to described sine sweep signal, it may be judged whether there is rust spalling stricture of vagina.
Described intelligent aggregate includes: the first housing；Second housing；It is fixed on described first surface of shell, and is clamped in
PZT sheet between described first housing and the second housing；Fix, with described PZT sheet, the shielding line being connected, and described shielding line is stretched
Go out described first housing.
Described first housing, the binding face of the second housing are provided with groove；Described shielding line be connected with described PZT sheet one
End is fixed in described groove.
Described shielding line is fixed in described groove by epoxide-resin glue.
Described first surface of shell, the second surface of shell, shielding line stretch out the part of described first housing and all scribble epoxy
Resin.
Described sine sweep signal frequency is 100Hz～150000Hz, and amplitude is 10V.
Described durable index n is defined as follows:
Wherein, S0The primary signal tested after reaching design load by prestressed concrete intensity and before structure rust rises
Primary power value obtained by being analyzed by matlab wavelet packet analysis program；SnRise process at rust for prestressed reinforced concrete construction
The energy value in the n-th stage that the signal of middle test is obtained by wavelet packet analysis.
When the durable index of component to be measured is less than 0.9, it is believed that structure produces corrosive crack.
Present invention also offers the manufacture method of a kind of intelligent aggregate, comprise the following steps:
1) the little cement square of concrete for making size 1 × 2 × 2cm of label identical with component to be measured is used, and 2 ×
When pouring on the face of 2cm, reserve a little square groove of 1.5 × 1.5 × 0.05cm at the center in this face, reach at little cement square
After 15MPa, the demoulding is stand-by, as housing；
2) by upper for the welding of PZT sheet shielding line, other one of this shielding line is connected with BNC connector；
3) by through step 2) element that makes is provided with one end epoxide-resin glue of PZT sheet and is bonded in step 1) in ready-made
In little square groove, additionally take step 1) another housing of making and be provided with the housing of PZT sheet and paste, PZT sheet is wrapped in the inside, shape
Become an intelligent aggregate；
4) in step 3) the intelligent aggregate surface smear epoxy resin that makes.
Described epoxy thickness is 0.2～0.3mm.
Compared with prior art, the had the beneficial effect that present invention of the present invention utilize the piezoelectricity two of piezoelectric ceramics to
Property characteristic, make be applicable to durability monitoring intelligent aggregate, by the change of energy, be monitored sentencing to corrosive crack
Not.The distinguishing features such as the present invention has with low cost, simple and quick, and accuracy rate is high, are highly suitable for high performance concrete
The corrosive crack detection of structure.
Accompanying drawing explanation
Fig. 1 is the workflow diagram of prestressing force HPC component corrosive crack detecting system based on intelligent aggregate；
Fig. 2 is the little concrete blocks in step one；
Fig. 3 is the detecting system of the present invention application in girder construction.
Detailed description of the invention
It is as follows that the present invention implements process
Step one, use the little cement square of concrete for making 1 × 2 × 2cm identical with treating geodesic structure, reach strong at it
On the face of 2 × 2cm, a little square groove of 1.5 × 1.5 × 0.05cm is polished, as housing along a wherein limit after degree.
Step 2, by the PZT sheet upper shielding line of welding, other one of this shielding line is connected with BNC connector.
Step 3, the element of step 2 is had PZT sheet that be bonded in step one ready-made with epoxide-resin glue
In little trough, additionally take the primary structural component made in step one and turn (that face reeded) stickup around, in being wrapped in by PZT sheet
Face, thus form an intelligent aggregate.
Step 4, the piezoelectric intelligent aggregate surface smear epoxy resin will made in step 3, be i.e. made for after drying
Intelligent aggregate for durability monitoring.
Step 5, need detection component pour time intelligent aggregate is embedded into design attitude.A portion
As signal driver, a part is as signal transducer.
Step 6, after this component reaches design strength, by pre-buried piezoelectric intelligent aggregate by BNC connector and NI
6363 multifunctional data acquirings (DAQ) equipment connects, simultaneously by computer by usb communication line NI 6363 multifunctional data acquiring
(DAQ) equipment connects.
Step 7, by computer control NI6363 drive intelligent aggregate launch 100HZ-150000HZ sine sweep believe
Number, the amplitude of its signal is 10V.
Step 8, simultaneously gathered, by NI6363, the signal that the intelligent aggregate as sensor will receive, and will collect
Data be saved in computer.
Step 9, the signal matlab wavelet analysis program of collection is carried out wavelet-packet energy analysis, as initial
Energy value S0。
Step 10, when this component needs detection by the method collection signal of step 6 to step 8, and pass through matlab
Calculate energy energy S nown, and the durable index calculated.
Step 11, think generation corrosive crack when durable index reaches below 0.90.
Step 4 is mainly in view of sensor at piezoelectric intelligent aggregate surface smear epoxide-resin glue be mainly used in easily producing
Get rusty erosion place, with epoxide-resin glue formed a protective layer, be also prevented from the infiltration of chloride ion simultaneously.Therefore epoxy resin should
It is divided into three brushings, first brushes for the first time.After intelligent aggregate dry tack free, then carry out brushing for the second time.Second time is coated with brushing
After, then carry out finally therefore brushing, dry stand-by.The protective layer thickness that epoxide-resin glue eventually forms should be at 0.2-
Between 0.3mm.The thickest easy transmitting-receiving affecting signal of protective layer, the thinnest piezoelectric intelligent aggregate that easily causes of protective layer is by the distending that becomes rusty
Split.
Step one is to the intelligent aggregate that step 4 is for making high-durability.
Design attitude between that face that presstressed reinforcing steel to protective layer is the thinnest, and should can not be positioned at presstressed reinforcing steel to
On the vertical of sake.
Piezoelectric ceramics as driver to bury one underground the most respectively with the piezoelectric ceramics as sensor, is distributed in pre-
Directly over stress rib, the distance between both sides, and two sensors is no more than 0.5m, the farthest easily causes the loss of signal.
The present invention is as it is shown on figure 3, a kind of structural healthy monitoring system for prestressing force high performance for concrete structure, a kind of
For the detecting system of high performance for concrete structure durability, intelligent aggregate, signal launch and data acquisition hardware system, letter
Number control with data processing software form.
The intelligent aggregate monitored due to durability that the present invention uses, its schematic diagram is as in figure 2 it is shown, use step one to step
The method of rapid four makes.
It is that the NI6363 multi-functional data that National Instruments produces is adopted that signal is launched with data acquisition hardware system
Collection (DAQ) equipment and auxiliary device thereof, passed through usb communication line and be connected with PC computer.
Signal controls and data processing software, the labVIEW self-programming software being mainly mounted on PC computer, and
Matlab wavelet analysis program.
By the high performance concrete component of predetermined monitoring, before component pours, intelligent aggregate is imbedded structure
Part, and shielding line is reserved component, embedment intelligent aggregate can not only be used for driver, the most also can be as sensor.Each group of work
0.5m it is not preferably greater than for the distance between the intelligent aggregate of sensor and driver.
After component reaches intensity, intelligent aggregate is connected with NI 6363, and by NI6363 by usb communication line and PC electricity
Brain connects.
By labVIEW programme-control NI6363 drive intelligent aggregate launch amplitude be 10V frequency be 100HZ-
The sine sweep signal of 150000HZ, and the letter of this structure different parts received as sensor is gathered by NI6363
Number.
And pass through the signal energy that matlab wavelet packet analysis program analysis is gathered, and using this energy value as corresponding position
Primary energy S put0。
Determine the signals collecting frequency of this component according to actual needs, by this component signal after some time is entered
Row gathers, and by the energy S of its signal of wavelet packet analysisn。
Define durable index to be shown below:
Judging the durable situation of component, when produce between certain set drive and sensor in component, durable index is less than
When 0.9, it is believed that structure produces corrosive crack in this place, the durability of structure is had a negative impact.
Claims (9)
1. the system detecting prestressed reinforced concrete construction corrosive crack, it is characterised in that including:
Intelligent aggregate；
Signal is launched and data collecting system: be used for driving described intelligent aggregate to launch sine sweep signal；
Signal controls and processing system: is used for controlling described signal and launches and data collecting system work,
And calculate durable index according to described sine sweep signal, it may be judged whether there is rust spalling stricture of vagina.
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 1, it is characterised in that described intelligence
Can include by aggregate:
First housing (1)；
Second housing (4)；
It is fixed on described first housing (1) surface, and is clamped in the PZT between described first housing (1) and the second housing (4)
Sheet (2)；
Fix the shielding line (3) being connected with described PZT sheet, and described shielding line (3) stretches out described first housing (1).
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 2, it is characterised in that described
One housing (1), the binding face of the second housing (4) are provided with groove；One end that described shielding line (3) is connected with described PZT sheet is solid
It is scheduled in described groove.
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 3, it is characterised in that described screen
Cover line (3) to be fixed in described groove by epoxide-resin glue.
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 2, it is characterised in that described
One housing (1) surface, the second housing (4) surface, shielding line (3) are stretched out the part of described first housing (1) and are all scribbled asphalt mixtures modified by epoxy resin
Fat.
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 2, it is characterised in that described just
String frequency swept signal is 100Hz～150000Hz, and amplitude is 10V.
The system of detection prestressed reinforced concrete construction corrosive crack the most according to claim 2, it is characterised in that described resistance to
Index n is defined as follows for a long time:
Wherein, S0The primary signal tested after reaching design load by prestressed concrete intensity and before structure rust rises is passed through
Primary power value obtained by the analysis of matlab wavelet packet analysis program；SnSurvey during rust rises for prestressed reinforced concrete construction
The energy value in the n-th stage that the signal of examination is obtained by wavelet packet analysis.
When the durable index of component to be measured is less than 0.9, it is believed that structure produces corrosive crack.
8. the manufacture method of an intelligent aggregate, it is characterised in that comprise the following steps:
1) the little cement square of concrete for making size 1 × 2 × 2cm of label identical with component to be measured is used, and at 2 × 2cm
Face on when pouring, reserve a little square groove of 1.5 × 1.5 × 0.05cm at the center in this face, reach 15MPa at little cement square
After, the demoulding is stand-by, as housing；
2) by upper for the welding of PZT sheet shielding line, other one of this shielding line is connected with BNC connector；
3) by through step 2) element that makes is provided with one end epoxide-resin glue of PZT sheet and is bonded in step 1) in ready-made little side
In groove, additionally take step 1) another housing of making and be provided with the housing of PZT sheet and paste, PZT sheet is wrapped in the inside, forms one
Individual intelligent aggregate；
4) in step 3) the intelligent aggregate surface smear epoxy resin that makes.
The manufacture method of intelligent aggregate the most according to claim 8, it is characterised in that described epoxy thickness is 0.2
～0.3mm.
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| CN201610684698.2A CN106226506A (en) | 2016-08-18 | 2016-08-18 | The system of detection prestressed reinforced concrete construction corrosive crack and aggregate manufacture method |
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| CN201610684698.2A CN106226506A (en) | 2016-08-18 | 2016-08-18 | The system of detection prestressed reinforced concrete construction corrosive crack and aggregate manufacture method |
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Cited By (5)
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| CN106932485A (en) * | 2017-02-23 | 2017-07-07 | 长沙理工大学 | A kind of presstressed reinforcing steel corrosion penetration monitoring method based on piezoelectric intelligent aggregate |
| CN106959365A (en) * | 2017-01-16 | 2017-07-18 | 长沙理工大学 | A kind of reinforced concrete girder structure corrosive crack cracking parameter monitoring method |
| CN107237249A (en) * | 2017-05-05 | 2017-10-10 | 长沙理工大学 | A kind of precast assembly box arch rib and its damage detecting method |
| CN108426770A (en) * | 2018-04-10 | 2018-08-21 | 长沙理工大学 | FRP tendons beams of concrete and preparation method thereof and beam Crack Monitoring device and method |
| CN114216838A (en) * | 2021-11-25 | 2022-03-22 | 华中科技大学 | Method for identifying concrete corrosion damage by implanted piezoelectric sensor |
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| CN108426770A (en) * | 2018-04-10 | 2018-08-21 | 长沙理工大学 | FRP tendons beams of concrete and preparation method thereof and beam Crack Monitoring device and method |
| CN114216838A (en) * | 2021-11-25 | 2022-03-22 | 华中科技大学 | Method for identifying concrete corrosion damage by implanted piezoelectric sensor |
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Application publication date: 20161214 |