CN207832429U - A kind of device for testing FRP transmission rod durabilities - Google Patents
A kind of device for testing FRP transmission rod durabilities Download PDFInfo
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- CN207832429U CN207832429U CN201721655084.8U CN201721655084U CN207832429U CN 207832429 U CN207832429 U CN 207832429U CN 201721655084 U CN201721655084 U CN 201721655084U CN 207832429 U CN207832429 U CN 207832429U
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Abstract
The utility model discloses a kind of devices for testing FRP transmission rod durabilities.The device includes pvc pipe sleeve, hydraulic lock and silicone sealing strip.The utility model will be in the pvc pipe sleeve of FRP transmission rod insertion apparatus, fill etchant solution simulation corrosive environment, thermostatic curing measures the variation of the quality, interlaminar shear strength, bending strength and the modulus of elasticity in static bending of the front and back FRP transmission rods of maintenance, judges the endurance quality of FRP transmission rods.The utility model is simple in structure, reasonable design, the FRP transmission rods destructive process from microcosmic angle, be conducive to probe into FRP transmission rod corrosion mechanisms, the long-term corrosion state under FRP transmission rod actual conditions is fully assessed, the test method that cement concrete pavement Long-Term Properties provide science is improved to reduce FRP transmission rod burn intos.
Description
Technical field
The utility model belongs to field of road, and in particular to a kind of device for testing FRP transmission rod durabilities.
Background technology
The transmission rod that China's cement concrete pavement uses at present is generally steel transmission rod, but a large amount of road practice
Data shows steel transmission rod, and there are certain defects.Using the steel transmission rod after for many years since the intrusions such as rainwater, chloride are held
Easy-to-rust leads to transmission rod cross-sectional area expansion and is in a kind of locking state, since temperature or moisture variation can lead to concrete
Expansion or shrinkage, the transmission rod locked at this time can cause prodigious stress concentration.Simultaneously as the case hardness that steel are larger,
It also results in transmission rod and generates stress concentration under wheel load effect with concrete contact interface.The two collective effect, for a long time
Transmission rod/concrete interface is caused gap occur under effect, generation is come to nothing, and then loses load transferring ability from joint；In addition, steel passes
The manufacturing cost of power bar is higher and service life is shorter, and economic benefit is poor.And glass-steel reinforced plastic (FRP) is that brittleness is compound
Material, have many advantages, such as it is light it is high-strength, durability is good, ability resistant to chemical etching is strong, can be in the ring of acid, alkali, villaumite and humidity
It is used for a long time in border, and smooth with concrete surface, rigidity is close, becomes the ideal material for replacing steel transmission rod.
However traditional steel transmission rod and the performance of FRP power transmission bar materials have very big difference, traditional biography with corrosion mechanism
Power bar durability test method and not applicable FRP transmission rods, the country not yet form a kind of perfect FRP transmission rod durabilities survey
Method for testing lacks the complete test method of system for the test of FRP transmission rod endurance qualities, and due to the non-conductive equal spies of FRP
Point, the durability test method for being badly in need of working out test FRP transmission rods carries out durability test to FRP transmission rods, to support FRP
Transmission rod obtains broader applications.
Utility model content
The purpose of this utility model is that in view of the deficiencies of the prior art, providing a kind of resistance to for testing FRP transmission rods
The device of long property, the device are Simple corrosion device.
The purpose of this utility model also resides in the device provided based on described for testing FRP transmission rod durabilities and is surveyed
Try the test method of FRP transmission rod durabilities.This method is by using containing Ca (OH)2, NaOH and KOH aqueous solution make
For corrosive environment, pass through the change of physical property and mechanical property of the measurement FRP transmission rods in corrosive environment before and after thermostatic curing
Change, obtains the durability of FRP transmission rods.
The purpose of this utility model is achieved through the following technical solutions.
It is a kind of for testing the devices of FRP transmission rod durabilities, including PVC (polyvinyl chloride) pipe sleeves cylinder, hydraulic lock and
Silicone sealing strip；
The hydraulic lock is arranged at the both ends of pvc pipe sleeve, two ports for lockking pvc pipe sleeve；
The silicone sealing strip is arranged on the end face of hydraulic lock, two ports for sealing pvc pipe sleeve.
The both ends of pvc pipe sleeve reduce etchant solution during experiment by being sealed with hydraulic lock and silicone sealing strip
Volatilization and concentration variation, advantageously ensure that the accuracy of test result.
Further, the length of pvc pipe sleeve is 200-300mm.
Based on the experimental method of the device to test FRP transmission rod durabilities, include the following steps：
(1) physical property and mechanical property of FRP transmission rods are measured；
(2) one end of the pvc pipe sleeve of device is lockked with hydraulic lock, silicone sealing strip is used in combination to seal, be inserted into FRP power transmissions
Etchant solution is filled in pvc pipe sleeve again after bar, so that FRP transmission rods is immersed in etchant solution, is finally lockked with hydraulic lock
The other end of pvc pipe sleeve is simultaneously sealed with silicone sealing strip, stands thermostatic curing；
(3) after conserving, FRP transmission rods are taken out, measure the physical property and mechanical property of FRP transmission rods, comparison is supported
The physical property and mechanical property of the front and back FRP transmission rods of shield, judge the endurance quality of FRP transmission rods.
Further, the physical property includes quality.
Further, the mechanical property includes interlaminar shear strength, bending strength and the modulus of elasticity in static bending.
Further, the etchant solution is：By mass fraction, 0.14-0.18%Ca (OH)2, 0.8-1.2% NaOH,
1.2-1.6%KOH, remaining is water.
Further, the temperature of the thermostatic curing is 55-65 DEG C.
Further, the time of the thermostatic curing is 14-28 days.
Since FRP transmission rods are long for the pavement usage time, and the corrosion resistance of FRP transmission rods is very strong, to accelerate FRP
The corrosion of transmission rod, therefore it is placed in the method that in etchant solution environment and constant temperature temperature conserves using by FRP transmission rods, improve FRP
The corrosion rate of transmission rod is tested 14 days accurately to be simulated true road surface effect and 28 days difference can be simulated really
Surface conditions 9 years and 18 years.
Compared with prior art, the utility model has the following advantages that and advantageous effect：
(1) the utility model is simple in structure, reasonable design, is provided for test FRP transmission rod durabilities and more improves system
The experimental rig of system, based on the strong feature of FRP transmission rod corrosion resistances, using the method for accelerated test, to FRP transmission rods
Long-term behaviour is predicted；
(2) the utility model is based on FRP transmission rod actual loading mechanism, carries out shearing resistance and beam test, while measuring and supporting
The front and back test specimen mass change of shield, can be visually known the variation of FRP transmission rod Properties Control factors, be conducive to the different materials of comparison
The endurance quality size of material and the FRP transmission rods of production method is more widely used for FRP transmission rods and provides scientific basis；
Description of the drawings
Fig. 1 is the Damage course schematic diagram of traditional steel transmission rod；
Fig. 2 is the installation drawing for testing FRP transmission rod durabilities；
Fig. 3 is the short beam shear test schematic diagram of FRP transmission rods；
Fig. 4 is the sectional view of the FRP transmission rods for beam test；
Fig. 5 is FRP transmission rod beam test schematic diagrames.
Specific implementation mode
Technical solutions of the utility model are described in further detail below in conjunction with specific embodiment and attached drawing, but this practicality
It is novel without being limited thereto.
Traditional steel transmission rod is metal material, has the very big difference, corrosive medium to be with the corrosion mechanism of FRP transmission rods
Cl-、O2And H2O；It is as shown in Figure 1 the Damage course schematic diagram of traditional steel transmission rod, when traditional steel transmission rod and concrete
When protective layer contact is good, corrosive medium diffusion velocity is slow, however fatigue loosens after occurring, dissolved with O2、CO2And Cl-Deng corrosion
Property medium solution obtain the high speed diffusion path of transmission rod anchored end in corrosion concrete in an axial direction so that steel transmission rod is sent out
Raw serious corrosion, while corrosion product can be accumulated largely.
A kind of device for testing FRP transmission rod durabilities is as shown in Fig. 2, include in the utility model specific embodiment
Pvc pipe sleeve 3, hydraulic lock 2 and silicone sealing strip 1；The length of pvc pipe sleeve 3 is 200-300mm；The setting of hydraulic lock 2 exists
The both ends of pvc pipe sleeve 3, two ports for lockking pvc pipe sleeve 3；Silicone sealing strip 1 is arranged in the end face of hydraulic lock 2
On, two ports for sealing pvc pipe sleeve 3.
It is used in the utility model specific embodiment and contains 0.14-0.18%Ca (OH)2, 0.8-1.2%NaOH and
For the aqueous solution of 1.2-1.6%KOH as corrosive environment, thermostatic curing 14-28 days at a temperature of 55-65 DEG C passes through measurement
The variation of physical property and mechanical property of the FRP transmission rods in corrosive environment before and after thermostatic curing, obtains the resistance to of FRP transmission rods
Long property.
The physical property of test is quality, and the mechanical property of test is interlaminar shear strength, bending strength and bending bullet
Property modulus.
Specific measurement situation is as follows：
1, physical property (quality)：The quality of FRP transmission rods is measured using electronic scale.
2, mechanical property：
(1) interlaminar shear strength：Interlaminar shear strength is measured using short beam shear test (SBT), test temperature is 23 ± 2
DEG C, experiment humidity is 50 ± 5%, measures the peak load that test specimen can be born；Test schematic diagram is as shown in figure 3, by FRP transmission rods
In on bearing, span centre is at the uniform velocity loaded both ends freely-supported vertically with 1.1-1.5mm/min speed, and shear plane distance is 2.5-3.5
Times power transmission shank diameter is loaded onto span centre interface and failure by shear, the load that system of computerizeing control record applies, meter occurs
Calculate interlaminar shear strength.
(2) experiment on flexural behavior：Bending strength and the modulus of elasticity in static bending are measured using simply supported beam test method(s), FRP when test
The section of transmission rod as shown in figure 4, beam test test schematic diagram as shown in figure 5, beam test both ends are placed on simply supported beam,
Span centre loads vertically, obtains load-displacement curve, calculates outer layer fiber maximum stress, Deflection Modulus of Elasticity and maximum strain.
The maximum stress of outer layer fiber appears in spaning middle section, and outer layer fiber maximum stress calculation formula is as follows：
S：Span centre external fibre stress (N/m2)；
P：The load (N) given in load-deformation curve；
L：Bearing span (m)；
I：Cross sectional moment of inertia,
C：Center to endpoint distance (m),Wherein B
=1- γ, G=arc sin A rad, H=2A-B；
T：Specimen thickness, D：Test specimen diameter
The calculation formula of Deflection Modulus of Elasticity is as follows：
Eb：The modulus of elasticity in static bending (N/m2)；
P：Constant load (N) is given in load-displacement curve；
L：Bearing span (m)；
I：Cross sectional moment of inertia；
Y：Maximum defluxion (m) under selected load.
By comparing the mass change of FRP transmission rods, interlaminar shear strength, bending strength and elasticity of flexure mould before and after maintenance
The variation of amount, analysis obtain FRP transmission rods corrosion rate and different materials type, different production method FRP durabilities it is big
It is small.
Embodiment 1
The durability for testing FRP transmission rods, includes the following steps：
A. shear resistance is tested
(1) 9 standard FRP transmission rods, length 450mm, diameter 32mm, number 1-9 are chosen；
(2) electronic scale is used to weigh the quality of each FRP transmission rods；
(3) 6 sets of experimental provisions for testing FRP transmission rod durabilities are chosen, wherein the pvc pipe of 6 covering devices covers tube length
It is 250mm, and is No. 1-6 by the pvc pipe sleeve of 4 covering devices number；
1-6 FRP transmission rods are inserted directly into the pvc pipe sleeve of reference numeral；Then by the pvc pipe set of each device
One end of cylinder is lockked with hydraulic lock, and silicone sealing strip is used in combination to seal, and it is 0.16%Ca that mass percent is filled in each sleeve
(OH)2, 1%NaOH and 1.4%KOH aqueous solution make etchant solution, so that FRP transmission rods is immersed in etchant solution, finally use
Hydraulic lock is lockked the other end of pvc pipe sleeve and is sealed with silicone sealing strip, and maintenance, curing temperature in thermostatic curing case are statically placed in
It is 60 DEG C；Wherein 1-3 FRP transmission rods conserve 14 days, and 4-6 FRP transmission rods conserve 28 days；
(4) interlaminar shear strength for testing 7-9 FRP transmission rods measures interlayer using short beam shear test (SBT) and cuts
Shearing stress, test temperature are 20-25 DEG C, and experiment humidity is 50%, and test schematic diagram is as shown in Fig. 3, by FRP transmission rods both ends
In on bearing, span centre is at the uniform velocity loaded freely-supported vertically with 1.5mm/min speed, and shear plane distance is 3 times of power transmission shank diameters, is surveyed
Try and record the peak load that test specimen can be born；
(5) after conserving 14 days, 1-3 experimental provisions are opened, cleaning FRP transmission rods surface is claimed after air-drying using electronic scale
The quality for measuring 1-3 FRP transmission rods, then carries out short beam shear test, measures interlaminar shear strength；
(6) after conserving 28 days, 4-6 experimental provisions are opened, cleaning FRP transmission rods surface is claimed after air-drying using electronic scale
The quality for measuring 4-6 FRP transmission rods, then carries out short beam shear test, measures interlaminar shear strength.
The front and back physical and mechanical properties test result of 1-9 FRP transmission rods maintenance is as shown in Table 1 and Table 2.
The front and back quality (g) of 1 1-9 FRP transmission rods of table maintenance
The front and back shear strength of 2 1-9 FRP transmission rods of table maintenance
From Tables 1 and 2 result：(1) it for 1-6 test specimens, is compared with 7-9 test specimens, is placed in etchant solution and supports
Mass lost after shield illustrates the test specimen by corrosiveness, and phenomena such as missing is peeled off, which occurs, in section causes quality to reduce；Meanwhile
The variation of shear strength meets the trend of mass change, and as quality reduces, interlaminar shear strength is decreased obviously, illustrate test specimen by
To the corrosiveness of solution, section is lost, and quality declines, and intensity declines；(2) with the increase of curing time, test specimen is corroded
Degree is deepened, and the variation of quality and the variation of interlaminar shear strength are shown as, and the two variation is mutually unified, and test specimen is corroded
Afterwards, Mass lost and the reduction of test specimen interlaminar shear strength, and test specimen extent of corrosion increment reduces after etching time growth.
B. bending resistance is tested
(1) 12 standard FRP transmission rods, length 450mm, diameter 32mm, number 1-12 are chosen；
(2) electronic scale is used to weigh the quality of each FRP transmission rods；
(3) 8 sets of experimental provisions for testing FRP transmission rod durabilities are chosen, wherein the pvc pipe of 8 covering devices covers tube length
It is 250mm, and is No. 1-8 by the pvc pipe sleeve of 4 covering devices number；
1-8 FRP transmission rods are inserted directly into the pvc pipe sleeve of reference numeral；Then by the pvc pipe sleeve of each device
One end lockked with hydraulic lock, be used in combination silicone sealing strip to seal, filled in each sleeve mass percent be 0.16%Ca
(OH)2, 1%NaOH and 1.4%KOH aqueous solution make etchant solution, so that FRP transmission rods is immersed in etchant solution, finally use
Hydraulic lock is lockked the other end of pvc pipe sleeve and is sealed with silicone sealing strip, and maintenance, curing temperature in thermostatic curing case are statically placed in
It is 60 DEG C；Wherein 1-4 FRP transmission rods conserve 14 days, and 5-8 FRP transmission rods conserve 28 days；
(4) bending strength for testing 9-12 FRP transmission rods measures bending strength, experiment temperature using three point bending test
Degree is 20-25 DEG C, and experiment humidity is 50%, and test schematic diagram is as shown in Figure 4 and Figure 5, by FRP transmission rods both ends freely-supported in branch
On seat, span 360mm, span centre is at the uniform velocity loaded vertically with 4mm/min speed, tests and record the maximum lotus that test specimen can be born
It carries；
(5) after conserving 14 days, 1-4 experimental provisions are opened, cleaning FRP transmission rods surface is claimed after air-drying using electronic scale
The quality for measuring 1-4 FRP transmission rods, then carries out three point bending test, measures bending strength；
(6) after conserving 28 days, 5-8 experimental provisions are opened, cleaning FRP transmission rods surface is claimed after air-drying using electronic scale
The quality for measuring 5-8 FRP transmission rods, then carries out three point bending test, measures bending strength.
The front and back physical and mechanical properties test result of 1-12 FRP transmission rods maintenance is as shown in Table 3 and Table 4.
The front and back quality (g) of 3 1-12 FRP transmission rods of table maintenance
The front and back bending strength of 4 1-12 FRP transmission rods of table maintenance
From 4 result of table 3 and table：(1) it for 1-8 test specimens, is compared with 9-12 test specimens, is placed in etchant solution and supports
Mass lost after shield illustrates the test specimen by corrosiveness, and phenomena such as missing is peeled off, which occurs, in section causes quality to reduce；Meanwhile
The variation of bending strength meets the trend of mass change, and as quality reduces, bending strength is decreased obviously, and illustrates test specimen by molten
The corrosiveness of liquid, section are lost, and quality declines, and intensity declines.(2) with the increase of curing time, test specimen is by extent of corrosion
Deepened, show as the variation of quality and the variation of bending strength, the two variation is mutually unified, and after test specimen is corroded, quality subtracts
Less and test specimen bending strength reduces, and test specimen extent of corrosion increment reduces after etching time growth.
Above example is the utility model preferred embodiment, and the test specimen corrosion condition under different situations is different, can incite somebody to action
Different test specimens are placed under identical corrosive environment, by analyzing the situation of change of test specimen physical property and mechanical property, probe into FRP biographies
The size of the corrosion rate and different materials type of power bar, different production method FRP durabilities.
Above example is only the utility model preferably embodiment, is only used for explaining the utility model, and unrestricted
The utility model, those skilled in the art under without departing from the spirit of the present invention essence made by change, replace, modification etc.
The scope of protection of the utility model should be belonged to.
Claims (2)
1. a kind of device for testing FRP transmission rod durabilities, which is characterized in that including pvc pipe sleeve, hydraulic lock and silicon
Glue sealing strip；
The hydraulic lock is arranged at the both ends of pvc pipe sleeve, two ports for lockking pvc pipe sleeve；
The silicone sealing strip is arranged on the end face of hydraulic lock, two ports for sealing pvc pipe sleeve.
2. a kind of device for testing FRP transmission rod durabilities according to claim 1, which is characterized in that pvc pipe set
The length of cylinder is 200-300mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721588804 | 2017-11-22 | ||
| CN2017215888043 | 2017-11-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318226A (en) * | 2017-11-30 | 2018-07-24 | 华南理工大学 | A kind of device and test method for testing FRP transmission rod durabilities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318226A (en) * | 2017-11-30 | 2018-07-24 | 华南理工大学 | A kind of device and test method for testing FRP transmission rod durabilities |
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