CN109959607A - A kind of concrete tension bond strength testing method - Google Patents
A kind of concrete tension bond strength testing method Download PDFInfo
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- CN109959607A CN109959607A CN201910364195.0A CN201910364195A CN109959607A CN 109959607 A CN109959607 A CN 109959607A CN 201910364195 A CN201910364195 A CN 201910364195A CN 109959607 A CN109959607 A CN 109959607A
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- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The present invention provides a kind of test method of tension adhesion strength, the following steps are included: (1) makes substrate test specimen, including production cast concrete base test specimen or base more than inorganic material substrate test specimen, cast concrete base test specimen need to be prepared in advance, strength grade and match ratio should be consistent with design or old concrete, and standard curing 28 days stand-by；Remaining inorganic material substrate test specimen uses excision forming；Substrate sample dimensions are 150mm × 150mm × 50mm, and bonded contact face carries out artificial feather plucking processing, makes surface 2~3m of average texture depth；One group of test specimen should make six substrate test specimens；(2) production stretches special fixture, makes upper fixture and lower fixture by sample dimensions；(3) adhesion strength test specimen is prepared, makes six altogether；(4) tension bonding strength test is carried out to six adhesion strength test specimens respectively；(5) test result is obtained.The adhesion strength of adhesive surface after being bonded by the available ideally concrete of this method and remaining inorganic material by distinct methods.
Description
Technical field
The invention belongs to construction project field, it can be used for testing directly bonding or rock and coagulation using binder bonding
The Experimental Method in Laboratory of the tension adhesion strength of soil, bond between fresh and hardened concretes and concrete and inorganic material.
Background technique
Bond strength testing method in inspection criterion at present all uses diametral compression test substantially, is converted by cleavage strength
Tension adhesion strength, but diametral compression test stress and the collapse state of tension adhesion strength are not fully consistent.And current work
Journey concrete binding face be mostly tension by with shearing stress, therefore the strength test that a journey can be carried out by tension collapse state completely is just
It is particularly important, determines that the main difficult point of test method is mainly following three points: 1, needing one kind to make test force and cohesive force
The consistent test fixture in tension direction, self weight and the automatic alignment which should offset test specimen by device miss to reduce test
Difference, 2, determine the bonding forced area of test specimen, forced area crosses that conference test specimen is overweight excessive, and preparation is not easy, and forced area is too small
Again without representativeness, so that the data of multiple test specimens is had biggish variance, be unfavorable for data statistic analysis.3, currently without a set of complete
The process approach of whole strong operability.The present invention mainly by designing dedicated tension stress bonding strength test fixture,
Simulation concrete adhesive surface tension stress has been worked out mixed according to the requirement of the design feature of fixture and reduction test error
Solidifying soil tension bond strength testing method, the tension that concrete and remaining inorganic material can be obtained by the test method bond
Intensity.It especially can detecte the adhesion strength of gunite concrete and rock
Summary of the invention
The present invention is prepared by sample, production, the test of tension bond damage of test instrument, several sides such as experimental data processing
Face to simulate the stress of adhesive surface tension destruction to greatest extent and reduces test error, can be used as tension bonding
The fundamental test of intensity is bonded by the available ideally concrete of this method and remaining inorganic material by distinct methods
The adhesion strength of adhesive surface afterwards.
Specifically, the present invention provides a kind of test method of tension adhesion strength, which is characterized in that including following step
It is rapid:
(1) substrate test specimen, including inorganic material substrate test specimen more than production cast concrete base test specimen or base, coagulation soil matrix are made
Bottom test specimen need to be prepared in advance, and strength grade and match ratio should be consistent with design or old concrete, and standard curing 28 days stand-by；Remaining
Inorganic material substrate test specimen uses excision forming；Substrate sample dimensions are 150mm × 150mm × 50mm, and bonded contact face carries out
Artificial feather plucking processing, makes surface 2~3m of average texture depth；One group of test specimen should make six substrate test specimens；
(2) production stretches special fixture, makes upper fixture and lower fixture by sample dimensions；
(3) adhesion strength test specimen is prepared, makes six altogether；
(4) tension bonding strength test is carried out to six adhesion strength test specimens respectively；
(5) test result is obtained.
In some preferred embodiments, in step (2), upper fixture includes two side plates, pressing plate, cover board and for fixing
The bolt of side plate and cover board；There is bending part at the top of side plate, for accepting cover board；There is insertion in side plate bending portion and patch ends
The through-hole of bolt；Lower fixture includes the groove for accommodating test specimen, supporting plate in groove and is connected to supporting plate and bottom portion of groove
Spring.
In some preferred embodiments, upper fixture further includes the connector and silk being fixed at the center of cover board outer surface
Bar；The recess detachable connection of the screw rod and connector；Lower fixture further includes pull rod, and pull rod is fixed on bottom portion of groove outer wall
Center.
By the side plate and pressing plate of upper fixture and the cooperation of cover board, carry out side holding test specimen, can guarantee test specimen by
When power, it will not occur to be destroyed inside test specimen prior to adhesive surface, the problem of so as to cause adhesion strength is unable to test.
In some preferred embodiments, pressing plate is located at below cover board and is located between two side plates.Specifically, pressing plate position
Between cover board and test specimen, for pushing down test specimen, it is vertically positioned at test specimen in upper fixture.
In some preferred embodiments, it is respectively equipped on the symmetrical two sides of groove and accommodates what supporting plate moved up and down
Shrinkage pool.
In some preferred embodiments, there is symmetrical convex block at the both sides of the edge center of supporting plate；Described two convex blocks
It is located in the shrinkage pool of groove two sides, and convex block can move up and down in shrinkage pool.
In some preferred embodiments, the pull rod other end is equipped with hole.The hole is for connecting tensile testing machine, thus under making
Fixture is connect with tensile testing machine.
In some preferred embodiments, the recess of screw rod and connector is spiral connection.
In some preferred embodiments, the recess of screw rod and connector is buckle-type connection.
In some preferred embodiments, step includes the following steps: in (3)
1) when the tension bonding strength test for gunite concrete and rock, prepare 1100mm × 800mm wood glue plate
It one piece, is punched by 150mm × 150mm × 150mm die trial otic placode position, 150mm × 150mm × 150mm die trial is removed into bottom
Die trial is fixed on wood glue plate with bolt through hole, the substrate test specimen prepared is put into die trial by plate；Billet applies in advance
Brush release agent, and billet is installed in substrate test piece upper part；When being used for normal concrete tension bonding strength test, directly use
150mm × 150mm × 150mm concrete test die, remaining step are identical；
2) when the tension bonding strength test for gunite concrete and rock, the gap between die trial is covered with plastic foil
Lid tamps, and is convenient for demoulding, carries out sweeping spray to wood glue plate after pulp shooting machine injection pressure is stablized, the coagulation soil property being sparged into die trial
Amount uniformly, stops whitewashing, and manually levelling to die trial surface after die trial inner concrete fills up, removes die trial after 24 hours；When
When for normal concrete tension bonding strength test, then directly pressed in concrete penetration concrete die trial outward from center
Under circumference plugs and pounds 30, remaining step is identical；
3) adhesion strength test specimen was according to standard curing 26 days.
In some preferred embodiments, include the following steps: in step 4)
1) the adhesion strength test specimen after the completion of conserving should shift to an earlier date two days and be placed on operation room natural air drying；
2) upper fixture is installed, the concrete sample two sides of two blocks of side plates of upper fixture and adhesion strength test specimen are uniformly applied
Epoxy resin is smeared, then the installation of both side plate bolt on the cover board but is not tightened into nut, both side plate is made to have small size activity space；
Both side plate is pasted onto concrete sample two sides after the completion, adjustment side plate make side plate while with concrete sample while it is parallel,
Nut is tightened, and clamps both side plate with other fixtures；
3) one day is conserved to epoxy resin cure；
4) lower fixture is installed, the spring of lower fixture is depressed, by adhesion strength test specimen out of groove side push-in groove, is made
The substrate test specimen of adhesion strength test specimen is located in groove and is located on supporting plate；
5) it is connected by the universal joint of screw rod and tensile testing machine in upper fixture, lower fixture passes through pull rod and pull test
The pedestal of machine is fixed；
6) spring is depressed before adhesion strength test specimen stress, makes adhesion strength test specimen freely sagging, then trip spring,
It allows spring to withstand adhesion strength test specimen, offsets the self weight of adhesion strength test specimen；
7) starting tensile testing machine applies pulling force to upper fixture with the speed of 5mm/min, and straight cause adhesion strength test specimen mixes
The bonding part of solidifying soil test specimen and substrate test specimen is destroyed.
Wherein, other fixtures can be elastic band, and side plate and test specimen are fixed together by elastic band.Other fixtures
It can be wooden dagger etc..
In some preferred embodiments, tensile bond strength is calculated as follows in step (4):
Fas --- tensile bond strength (MPa)
Load (N) when F --- adhesion strength test specimen destroys
The concrete sample and substrate test specimen bond area (mm) of A --- adhesion strength test specimen.
In some preferred embodiments, the specific steps of test result are obtained in step (5) are as follows:
1) with the arithmetic mean of instantaneous value of the measured value of six test specimens as the test result of tension adhesion strength；
2) when the difference of the intensity value of single test specimen and average value is greater than 20%, the maximum test of deviation should gradually be given up
Value, when validity test value is no less than 4, takes the flat of valid data until each experimental test value and average value are not more than 20%
As a result mean value is accurate to 0.01MPa as test result.
Beneficial effect
Of the invention carries out tension bonding strength test by stretching special fixture: firstly, stretching special fixture crosses this
Fixture can bond clamping test pieces with side, eliminate the influence of eccentric force, avoid first destroying in the middle part of test specimen when test, ensure that viscous
Junction is destroyed, to ensure that the success rate of test.Also, the spring of lower fixture can offset test specimen in clamping test pieces certainly
Weight guarantees to offset self weight in test specimen forces testing and experimental result is accurate.Secondly, the tension bond strength testing method maximum limit
The stress for simulating the destruction of adhesive surface tension of degree simultaneously reduces test error, can be used as the basic of tension adhesion strength
Test, by the available ideally concrete of this method and remaining inorganic material by adhesive surface after distinct methods bonding
Adhesion strength.
Detailed description of the invention
Fig. 1 is the schematic diagram of stretching special fixture clamping test pieces of the invention.
Fig. 2 is the schematic diagram of upper fixture clamping test pieces of the present invention.
Fig. 3 is the side plate schematic diagram of upper fixture of the present invention.
Fig. 4 is the cover plate schematic diagram of upper fixture of the present invention.
Fig. 5 is the schematic diagram of the lower fixture of the present invention.
Fig. 6 is the supporting plate schematic diagram of the lower fixture of the present invention.
Fig. 7 is that the present invention descends the groove of fixture from the face A (side) view.
Fig. 8 is that special fixture of the present invention and tensile testing machine cooperate schematic diagram.
Fig. 9 is the die trial schematic diagram that the present invention is installed for gunite concrete and rock tension adhesion strength.
Figure 10 is adhesion strength test specimen schematic diagram of the present invention.
Appended drawing reference
Upper fixture 100, side plate 110, bending part 111, pressing plate 120, bending part through-hole 112, cover board 130, cover plate through hole
131, bolt 140, connector 150, recess 151, screw rod 160, lower fixture 200, groove 210, shrinkage pool 211, supporting plate 220, supporting plate
Convex block 221, spring 230, pull rod 240, the hole 241 on pull rod, concrete sample 300, substrate test specimen 400, adhesion strength test specimen
800, tensile testing machine 500, oil cylinder 501, universal joint 502, pin 503, wood glue plate 600, die trial 700, the gap between die trial
601, otic placode 701, otic placode bolt 702, billet 703
Specific embodiment
Structure of the present invention or technical term used in these are described further below.Following detailed
In thin description, the subsidiary reference word of legend is a part here, it can be actable specific to illustrate the present invention
The mode of concrete scheme illustrates.The present invention, which is not precluded, in we can also carry out other concrete schemes and without prejudice to this hair
Change structure of the invention in the case where bright use scope.
As shown in figs. 1-7, the stretching special fixture for tension bonding strength test of the invention is made of two parts:
Fixture 100 and lower fixture 200 clamp test specimen by the cooperation of upper fixture 100 and lower fixture 200, wherein test specimen includes viscous
The substrate test specimen 400 and concrete sample 300 of knot together, substrate test specimen 400 is the inorganic material with rigidity, when inorganic
It when material is concrete, should prepare in advance for use, the method preparation of excision forming can be used in rock.The stretching of test specimen will have been clamped
Specific purpose tool is connected on tensile testing machine, applies pulling force, to test between test specimen (substrate test specimen and concrete sample)
Adhesion strength.Stretching special fixture through the invention, the especially side holding of upper fixture 100 guarantee test specimen in fixture
Correct position, to guarantee that the pulling force that is subject to is positive force, to guarantee the accuracy of experiment and the validity of result.
Wherein, upper fixture 100 includes two side plates 110, pressing plate 120 and cover board 130, and as in Figure 2-4, side plate 120 is used
In the symmetrical two side walls for being fitted in concrete sample 300, wherein there is bending part 111 at the top of side plate, mixed when side wall is located at
When solidifying soil 300 side wall of test specimen, two bending parts 111 deviate from concrete sample 300.Pressing plate 120 is placed on concrete sample 300
Between cover board 130.Cover board 130 is located on pressing plate 120, while 130 end of cover board is located in side plate bending portion 111, cover board
130 are fixedly connected by bolt 140 with side plate bending portion 111.Specifically, on 130 end of side plate bending portion 111 and cover board
Through-hole 112 and 131 with insertion bolt, after bolt 140 is inserted into through-hole 112 and 131, nut locking bolt 140.In order to protect
Test specimen 300 and upper fixture 100 is demonstrate,proved to be fitted close, upper cover plate 130 is the reversed convex type structure with step, the reversed convex type lower surface with
120 surface size of pressing plate is identical, and the lower surface of reversed convex type cover board 130 is contacted with pressing plate 120, to ensure that test specimen 300 can
It is positioned in upper fixture 100.
In use, epoxy resin is uniformly smeared in the two sides of two blocks of side plates 110 of upper fixture and test specimen 300, by side plate
It is placed close to 300 side wall of test specimen, pressing plate 120 is put into above test specimen, then the bending part of both side plate is mounted on cover board with bolt
On 130 but nut is not tightened, both side plate is made to have small size activity space；Both side plate is pasted onto the two of concrete sample after the completion
Side, adjustment side plate make side plate while with concrete sample while it is parallel, tighten nut.
In some embodiments, upper fixture further includes the connector 150 and screw rod 160 being fixed at the center of cover board outer surface；
151 detachable connection of recess of the screw rod 160 and connector.Screw rod 160 is received specifically, having on connector 150
Recess 151.Screw rod 160 is spirally connect with the recess 141 of connector or buckle-type connects.
In the present invention, as shown in figure 5, lower fixture 200 includes the groove 210 for accommodating test specimen, the supporting plate 220 in groove
And it is connected to the spring 230 of supporting plate and bottom portion of groove.In specific embodiment, groove 210 is symmetrical with two by a bottom
Side enclose, in addition two sides are vacant, for being pushed into test specimen.Distinguish in two side tops of groove 210 direction into slot
Equipped with bending part, make in slot object after stress without departing from groove.
As shown in fig. 7, the symmetrical two sides of groove 210, which are respectively provided with, accommodates the shrinkage pool 211 that supporting plate 220 moves up and down.Support
There is symmetrical convex block 221, as shown in Figure 6 at the both sides of the edge center of plate 220.When supporting plate 220 is located in groove, two
Convex block 221 is located in the shrinkage pool 211 of two sides of groove, and since shrinkage pool 211 is strip, convex block 221 can be in shrinkage pool
It is moved up and down in 211.
Spring 230 between 210 bottom of supporting plate 220 and groove can offset test specimen certainly in clamping test pieces
Weight.When installing test specimen, the spring 230 of lower fixture is depressed, supporting plate 220 also can downlink therewith, by test specimen from 210 blank of groove
Side push-in groove in, and be located on supporting plate 220.Lower fixture 200 further includes pull rod 240, and 240 one end of pull rod is fixed on recessed
In 210 bottom outer wall of slot, 240 other end of pull rod has hole 241, and through hole 241 connects pull rod 240 and tensile testing machine 500
It connects.
One, which is utilized, to be stretched specific purpose tool and carries out adhesion strength Experimental Method in Laboratory (for the anti-of gunite concrete and rock
Draw adhesion strength examination) specific as follows:
1 substrate test specimen 400 processed
Substrate test specimen 400 includes inorganic material basement rock test specimen more than production cast concrete base test specimen and/or base, concrete
Substrate test specimen is prepared in advance, and strength grade and match ratio should be consistent with design or old concrete, and standard curing 28 days stand-by；Rock
Excision forming can be used in remaining inorganic material substrate test specimen of stone；Substrate sample dimensions are 150mm × 150mm × 50mm, and bonding connects
Contacting surface carries out artificial feather plucking processing, makes surface 2~3m of average texture depth；1 group of test specimen should make 6 substrate test specimens.
2. preparation stretches special fixture
Upper fixture and lower fixture are made by 800 size of adhesion strength test specimen, as shown in figs. 1-7.
3 prepare adhesion strength test specimen 800 as shown in Figure 10, make six altogether
1) prepare 600 1 pieces of 1100mm × 800mm wood glue plate, by 150mm × 150mm × 150mm die trial 700 otic placode
150mm × 150mm × 150mm die trial 700 is removed bottom plate by the punching of 701 positions, with bolt 702 by 701 through hole of die trial otic placode
It is fixed on wood glue plate 600, the substrate test specimen 400 prepared is put into die trial 700；The brushing release agent in advance of billet 703,
And billet 703 is installed in 400 top of substrate test specimen, the die trial being installed is as shown in Figure 9.
2) gap 601 between die trial 700 is covered with plastic foil and is tamped, and is convenient for demoulding, when pulp shooting machine injection pressure is stablized
Wood glue plate 600 is carried out afterwards to sweep spray, it is desirable that the concrete quality sprayed into die trial 700 is uniform, fills out to 700 inner concrete of die trial
Stop whitewashing after full, and manually levelling to 700 surface of die trial, die trial 700 is removed after 24 hours；Adhesion strength examination after molding
Part such as Figure 10.
4. bonding strength test respectively does experiment to six test specimens
Install upper fixture: adhesion strength test specimen 800 should be 26 days by standard curing, test taking-up in the first two day and are placed on operation room certainly
It is so dry, epoxy is uniformly smeared into 300 two sides of concrete sample of two blocks of side plates 110 of upper fixture and adhesion strength test specimen
Resin, then the bolt 140 of both side plate 110 is mounted on cover board 130 but not tightened nut, so that both side plate 110 is had small size work
Dynamic space；Both side plate 110 is pasted onto the two sides of concrete sample 300 after the completion, adjustment side plate 110 makes the side of side plate 110
It is parallel with the side of concrete sample 300, tighten nut, and clamp both side plate 110 with other fixtures such as elastic band, maintenance one day to
Epoxy resin cure.Adhesion strength test specimen such as Fig. 2 after installing upper fixture.Screw rod 160 is loaded onto upper fixture.
Lower fixture is installed, the spring 230 of lower fixture is depressed, adhesion strength test specimen 800 is pushed into groove from groove side
It is interior, it is located at the substrate test specimen 400 of adhesion strength test specimen in groove 210 and is located on supporting plate 220.
Connect by the screw rod 160 in upper fixture with the universal joint 502 of tensile testing machine, lower fixture by pull rod 240 with
The pedestal of tensile testing machine 500 is fixed, as shown in Figure 8.Specifically, the screw rod 160 of the upper fixture 100 of special fixture is inserted into
It is fixedly connected on universal joint 502 on to tensile testing machine, universal joint is connected on oil cylinder 501, and the pull rod 240 of lower fixture is logical
Via hole 241 is locked on the pedestal of tensile testing machine 500 by the insertion of pin 503.
Spring is depressed before adhesion strength test specimen stress, makes adhesion strength test specimen freely sagging, then trip spring, allows
Spring withstands adhesion strength test specimen, offsets the self weight of adhesion strength test specimen.
Start tensile testing machine and pulling force is applied to upper fixture, the straight coagulation for causing adhesion strength test specimen with the speed of 5mm/min
The bonding part of native test specimen and substrate test specimen is destroyed.That is, starting tensile testing machine 500 is by oil cylinder 501 with the speed of 5mm/min
Special fixture is applied the pulling force to, upper fixture 100 is pulled up, and lower fixture is fixed on pedestal, thus 800 stress of test specimen,
The bonding part of the straight concrete sample 300 for causing test specimen 800 and substrate test specimen 400 is destroyed.
Tension adhesion strength is calculated as follows
fas--- tensile bond strength (MPa)
F --- load (N) A when adhesion strength test specimen destroys --- concrete sample and substrate of adhesion strength test specimen
Test specimen bond area (mm)
5. test data counts
1 with the arithmetic mean of instantaneous value of the measured value of six test specimens as the test result of tension adhesion strength；
2, when the difference of the intensity value of single test specimen and average value is greater than 20%, should gradually give up the maximum test value of deviation,
Until each experimental test value and average value are not more than 20%, when validity test value is no less than 4, the average value of valid data is taken
As test result, it is as a result accurate to 0.01MPa.
This test method mainly solves current concrete and each inorganic material tension adhesion strength original test method is destroyed
Model and the inconsistent problem of true stress condition, take the stress for designing dedicated stretcher to simulate tension bond damage
Form, it is more reasonable using 100mm × 100mm that test adhesive surface is determined, passes through a series of materials, manufacture craft, experimental enviroment
The standard deviation that essentially identical test data (see the table below) testing result is 0.14.
Therefore, this test can be used as the simulation test of site operation, can optimize for site construction technology parameter
Reference data is provided, can also be used as the foundation of design confirmation, no condition does the engineering of field test, can also serve as matter
Measure the foundation of acceptance inspection and evaluation.There is stronger effect in engineering.
Two, which are utilized, stretches specific purpose tool progress adhesion strength Experimental Method in Laboratory (by force for normal concrete tension bonding
Degree test) specific as follows:
1 substrate test specimen 400 processed
Substrate test specimen 400 includes inorganic material basement rock test specimen more than production cast concrete base test specimen and/or base, concrete
Substrate test specimen is prepared in advance, and strength grade and match ratio should be consistent with design or old concrete, and standard curing 28 days stand-by；Rock
Excision forming can be used in remaining inorganic material substrate test specimen of stone；Substrate sample dimensions are 150mm × 150mm × 50mm, and bonding connects
Contacting surface carries out artificial feather plucking processing, makes surface 2~3m of average texture depth；1 group of test specimen should make 6 substrate test specimens.
2. preparation stretches special fixture
Upper fixture and lower fixture are made by 800 size of adhesion strength test specimen, as shown in figs. 1-7.
3 prepare adhesion strength test specimen 800 as shown in Figure 10
1) 150mm × 150mm × 150mm concrete test die 700 is directly used, the substrate test specimen 400 prepared is put into examination
In mould 700；The brushing release agent in advance of billet 703, and billet 703 is installed in 400 top of substrate test specimen
2) concrete is poured into die trial 700, keeps concrete quality uniform, under plugging and pounding 30 by circumference outward from center, and
It is manually levelling to 700 surface of die trial, die trial 700 is removed after 24 hours；
4. bonding strength test
Install upper fixture: adhesion strength test specimen 800 should be 26 days by standard curing, test taking-up in the first two day and are placed on operation room certainly
It is so dry, epoxy is uniformly smeared into 300 two sides of concrete sample of two blocks of side plates 110 of upper fixture and adhesion strength test specimen
Resin, then the bolt 140 of both side plate 110 is mounted on cover board 130 but not tightened nut, so that both side plate 110 is had small size work
Dynamic space；Both side plate 110 is pasted onto the two sides of concrete sample 300 after the completion, adjustment side plate 110 makes the side of side plate 110
It is parallel with the side of concrete sample 300, nut is tightened, and clamp both side plate 110 with elastic band or the wooden dagger, conserves one day to ring
Oxygen resin solidification.Adhesion strength test specimen such as Fig. 2 after installing upper fixture.Screw rod 160 is loaded onto upper fixture.
Lower fixture is installed, the spring 230 of lower fixture is depressed, adhesion strength test specimen 800 is pushed into groove from groove side
It is interior, it is located at the substrate test specimen 400 of adhesion strength test specimen in groove 210 and is located on supporting plate 220.
Connect by the screw rod 160 in upper fixture with the universal joint 502 of tensile testing machine, lower fixture by pull rod 240 with
The pedestal of tensile testing machine 500 is fixed；As shown in Figure 8.Specifically, the screw rod 160 of the upper fixture 100 of special fixture is inserted into
It is fixedly connected on universal joint 502 on to tensile testing machine, universal joint is connected on oil cylinder 501, and the pull rod 240 of lower fixture is logical
Via hole 241 is locked on the pedestal of tensile testing machine 500 by the insertion of pin 503.
Spring is depressed before adhesion strength test specimen stress, makes adhesion strength test specimen freely sagging, then trip spring, allows
Spring withstands adhesion strength test specimen, offsets the self weight of adhesion strength test specimen.
Start tensile testing machine and pulling force is applied to upper fixture, the straight coagulation for causing adhesion strength test specimen with the speed of 5mm/min
The bonding part of native test specimen and substrate test specimen is destroyed.That is, starting tensile testing machine 500 is by oil cylinder 501 with the speed of 5mm/min
Special fixture is applied the pulling force to, upper fixture 100 is pulled up, and lower fixture is fixed on pedestal, thus 800 stress of test specimen,
The bonding part of the straight concrete sample 300 for causing test specimen 800 and substrate test specimen 400 is destroyed.
Tension adhesion strength is calculated as follows
fas--- tensile bond strength (MPa)
Load (N) when F --- adhesion strength test specimen destroys
The concrete sample and substrate test specimen bond area (mm) of A --- adhesion strength test specimen
5. test data counts
1. with the arithmetic mean of instantaneous value of the measured value of six test specimens as the test result of tension adhesion strength；
2. should gradually give up the maximum test of deviation when the difference of the intensity value of single test specimen and average value is greater than 20%
Value, when validity test value is no less than 4, takes the flat of valid data until each experimental test value and average value are not more than 20%
As a result mean value is accurate to 0.01MPa as test result.
Claims (7)
1. a kind of concrete tension bond strength testing method, which comprises the following steps:
(1) substrate test specimen, including inorganic material substrate test specimen more than production cast concrete base test specimen or base, cast concrete base examination are made
Part need to be prepared in advance, and strength grade and match ratio should be consistent with design or old concrete, and standard curing 28 days stand-by；Remaining is inorganic
Material substrate test specimen uses excision forming；Substrate sample dimensions are 150mm × 150mm × 50mm, and bonded contact face carries out artificial
Feather plucking processing, makes surface 2~3m of average texture depth；One group of test specimen should make six substrate test specimens；
(2) production stretches special fixture, makes upper fixture and lower fixture by sample dimensions；
(3) adhesion strength test specimen is prepared, makes six altogether；
(4) tension bonding strength test is carried out to six adhesion strength test specimens respectively；
(5) test result is obtained.
2. a kind of concrete tension bond strength testing method according to claim 1, which is characterized in that in step (2),
Upper fixture includes two side plates, pressing plate, cover board and the bolt for fixed side panel and cover board；There is bending part at the top of side plate, is used for
Accept cover board；There is the through-hole of insertion bolt in side plate bending portion and patch ends；Lower fixture includes the groove for accommodating test specimen, position
In the supporting plate in groove and it is connected to the spring of supporting plate and bottom portion of groove.
3. a kind of concrete tension bond strength testing method according to claim 2, which is characterized in that upper fixture is also wrapped
Include the connector and screw rod being fixed at the center of cover board outer surface；The recess detachable connection of the screw rod and connector；Under
Fixture further includes pull rod, and pull rod is fixed on bottom portion of groove outer wall center.
4. a kind of concrete tension bond strength testing method described in one of -3 according to claim 1, which is characterized in that step
(3) include the following steps: in
1) when the tension bonding strength test for gunite concrete and rock, prepare one piece of 1100mm × 800mm wood glue plate,
It is punched by 150mm × 150mm × 150mm die trial otic placode position, 150mm × 150mm × 150mm die trial is removed into bottom plate, is used
Die trial is fixed on wood glue plate by bolt through hole, and the substrate test specimen prepared is put into die trial；Billet is brushed de- in advance
Mould agent, and billet is installed in substrate test piece upper part；When being used for normal concrete tension bonding strength test, directly use
150mm × 150mm × 150mm concrete test die, remaining step are identical；
2) when the tension bonding strength test for gunite concrete and rock, the gap plastic foil covering between die trial is filled out
It is real, it is convenient for demoulding, wood glue plate is carried out to sweep spray after pulp shooting machine injection pressure is stablized, the concrete quality being sparged into die trial is equal
It is even, stop whitewashing after die trial inner concrete fills up, and manually levelling to die trial surface, removes die trial after 24 hours；When being used for
When normal concrete tension bonding strength test, then circumference is directly pressed outward from center by concrete penetration concrete die trial
Under plugging and pounding 30, remaining step is identical；
3) adhesion strength test specimen was according to standard curing 26 days.
5. a kind of concrete tension bond strength testing method according to claim 4, which is characterized in that in step (4)
Include the following steps:
1) the adhesion strength test specimen after the completion of conserving should shift to an earlier date two days and be placed on operation room natural air drying；
2) upper fixture is installed, ring is uniformly smeared into the concrete sample two sides of two blocks of side plates of upper fixture and adhesion strength test specimen
Oxygen resin, then the installation of both side plate bolt on the cover board but is not tightened into nut, so that both side plate is had small size activity space；It completes
Both side plate is pasted onto concrete sample two sides afterwards, adjustment side plate make side plate while with concrete sample while it is parallel, tighten
Nut, and both side plate is clamped with other fixtures；
3) one day is conserved to epoxy resin cure；
4) lower fixture is installed, the spring of lower fixture is depressed, by adhesion strength test specimen out of groove side push-in groove, makes to bond
The substrate test specimen of intensity test piece is located in groove and is located on supporting plate；
5) it is connected by the universal joint of screw rod and tensile testing machine in upper fixture, lower fixture passes through pull rod and tensile testing machine
Pedestal is fixed；
6) spring is depressed before adhesion strength test specimen stress, makes adhesion strength test specimen freely sagging, then trip spring, allow bullet
Spring withstands adhesion strength test specimen, offsets the self weight of adhesion strength test specimen；
7) starting tensile testing machine applies pulling force to upper fixture, the straight concrete for causing adhesion strength test specimen with the speed of 5mm/min
The bonding part of test specimen and substrate test specimen is destroyed.
6. a kind of concrete tension bond strength testing method according to claim 5, which is characterized in that in step (4)
Tensile bond strength is calculated as follows:
Fas --- tensile bond strength (MPa)
Load (N) when F --- adhesion strength test specimen destroys
The concrete sample and substrate test specimen bond area (mm) of A --- adhesion strength test specimen.
7. a kind of adhesion strength Experimental Method in Laboratory according to claim 1, which is characterized in that obtain examination in step (5)
Test the specific steps of result are as follows:
1) with the arithmetic mean of instantaneous value of the measured value of six test specimens as the test result of tension adhesion strength；
2) when the difference of the intensity value of single test specimen and average value is greater than 20%, the maximum test value of deviation should gradually be given up, directly
It is not more than 20% to each experimental test value and average value, when validity test value is no less than 4, the average value of valid data is taken to do
For test result, it is as a result accurate to 0.01MPa.
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