CN109781620A - A kind of pitch cohesive strength measuring method - Google Patents
A kind of pitch cohesive strength measuring method Download PDFInfo
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- CN109781620A CN109781620A CN201910246050.0A CN201910246050A CN109781620A CN 109781620 A CN109781620 A CN 109781620A CN 201910246050 A CN201910246050 A CN 201910246050A CN 109781620 A CN109781620 A CN 109781620A
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Abstract
The invention discloses a kind of pitch cohesive strength measuring method, this method comprises: one, by improved strain controlling formula direct shear apparatus upper box and the fixation of lower box be assembled into shearing force box, coat Bituminous Isolation Agent；Two, it pours into after heating pitch in the shearing force box for be coated with Bituminous Isolation Agent and is kept the temperature after cooling；Three, the shearing force box horizontal rolling equipped with pitch after will be warm simultaneously returns to zero to dynamometry dial gauge；Four, the Fixed latches for taking out shearing force box, start stopwatch simultaneously uniform rotation handwheel and observe and record pitch maximum shear deformation reading；Five, value of shearing, that is, pitch cohesive strength when pitch failure by shear is calculated.The present invention improves the shearing force box of strain controlling formula direct shear apparatus, obtaining vertical section is I-shaped asphalt sample, reduce the internal stress and forced area of asphalt sample, pitch failure mechanics are avoided by vertical direct stress action breaks down, reduce the horizontal force in cohesive strength continuous mode, measurement difficulty is reduced, the accuracy and accuracy of measurement result are improved.
Description
Technical field
The invention belongs to highway engineering asphalt performance the field of test technology, and in particular to a kind of pitch cohesive strength measurement side
Method.
Background technique
Cohesive strength is called cohesive force, refers to the mutual attractive force inside substance of the same race between adjacent sections, this mutual
Attraction is the performance between material molecule of the same race there are molecular force, accordingly it is also possible to think that cohesive strength is exactly that substance is destroying
Face does not have the shearing strength under any direct stress effect.Cohesive strength can make material aggregation at liquid or solid, especially with it is solid
In the liquid adhesive layer of body contact, due to the difference of cohesive strength and adhesive force relative size, causes liquid infiltration solid or do not soak
Moisten solid.In asphalt, asphalt and aggregate bond effect is this principle, so, the intensity of asphalt is not only
It is related with the inner frictional resistance of the cohesive strength of asphalt binder and mineral aggregate particle, it is also related with the adhesive force of asphalt and aggregate.But,
What is wherein played a major role is still the size of asphalt binder cohesive strength and mineral aggregate particle inner frictional resistance.However, to current
Until, the cohesive strength for directly testing asphalt binder is gone still without preferable method.
According to the measuring method of soil cohesive strength in soil mechanics, in effective stress, total shearing strength deduction is rubbed
Intensity is wiped, cohesive strength can be obtained.But due to most of strength envelopes are not linear, and it is looked for by extension straightway
It is again inaccurate that intercept determines cohesive strength, therefore in many cases, in very low confining pressure even without cutting under confining pressure (no direct stress)
Test is cut also all to be difficult to accurately determine cohesive strength.
In consideration of it, the present invention wishes the concept from cohesive strength, the simple and easy to do and result of one kind is found accurately and reliably
The method for measuring its cohesive strength by shearing test of the pitch failure mechanics in the case where not acted on by vertical direct stress.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of pitch adhesive aggregation
Power measuring method.This method is improved based on shearing force box of the material property of pitch to strain controlling formula direct shear apparatus, is indulged
Section is I-shaped asphalt sample, to reduce the internal stress and sample forced area of asphalt sample, it is broken to avoid pitch
Bad face is destroyed by vertical direct stress acting shear, reduces the horizontal force in cohesive strength continuous mode, so that it is difficult to reduce measurement
Degree, improves the accuracy and accuracy of measurement result.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of pitch cohesive strength measuring method, it is special
Sign is, method includes the following steps:
Step 1: by improved strain controlling formula direct shear apparatus upper box 4 and lower 2 aligned fit of box be assembled into shearing
Then box coats Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is provided in the upper box by major diameter circular hole and path
Circular hole perforation composition and vertical section are the circular hole of convex shape, are provided in the lower box and are made of major diameter circular hole and path circular hole
And vertical section is the blind hole of convex shape, and major diameter circular hole is identical as the internal diameter of major diameter circular hole in lower box in upper box, upper box small-and-middle diameter
Circular hole is identical as the internal diameter of lower box small-and-middle diameter circular hole；
Step 2: being poured into step 1 in the shearing force box for being coated with Bituminous Isolation Agent after pitch is heated to 140 DEG C~160 DEG C
To graduation mark, it is subsequently placed at 20 DEG C~25 DEG C cooling 1.5h or more, 1.5h~2.0h is then kept the temperature under conditions of 60 DEG C；
Step 3: rotation handwheel drives and seat is pushed to push lower box, thus drive it is warm in step 2 after equipped with pitch
Shearing force box roll in the horizontal direction, until upper box on steel ball contact dynamometer, then adjust dynamometer on dynamometry percentage
The reading of table is zeroed；
Step 4: take out the Fixed latches of shearing force box, stopwatch is started, while uniform rotation handwheel and observing dynamometry dial gauge
Pointer, when the pointer of dynamometry dial gauge does not readvance and retreats, then sample failure by shear, records dynamometry percentage
The reading of table is deformed as pitch maximum shear and is read, when the pointer of dynamometry dial gauge is continuously advanced with the rotation of handwheel,
The reading of dynamometry dial gauge at regulation hand wheel rotating 100 weeks is pitch maximum shear deformation reading；The dynamometry dial gauge
Reading is accurate to 0.01mm；
Step 5: shearing force box to be removed to and taken out pitch after handwheel is reversed go back to original position, original position is put back to after cleaning shearing force box,
Then it is deformed and is read according to pitch maximum shear obtained in step 4, calculate value of shearing, that is, pitch when pitch failure by shear
Cohesive strength τ=Cd·Rm, wherein τ is pitch cohesive strength, unit kPa, CdFor dynamometer correction coefficient, unit kPa/
0.01mm, RmIt deforms and reads for pitch maximum shear, unit 0.01mm.
The C of dynamometer correction coefficient described in step 5dFor constant, specific value is by the shearing in strain controlling formula direct shear apparatus
Ring determines.
The present invention using strain controlling formula direct shear apparatus measurement pitch cohesive strength, by apply horizontal force to asphalt sample into
Value of shearing, that is, pitch cohesive strength when row failure by shear is in the hope of pitch failure by shear, pitch in pitch cohesive strength continuous mode
Sample carries out failure by shear under the action of opposite horizontal power, and pitch failure mechanics are not acted on by vertical direct stress.The present invention is based on
The material property of pitch improves the shearing force box of strain controlling formula direct shear apparatus, will be improved to originally by the upper box that circular hole forms
It is made of major diameter circular hole and the perforation of path circular hole and vertical section is the structure of the circular hole of convex shape, by what is be made of originally circular hole
Lower box is improved to be made of major diameter circular hole and the perforation of path circular hole and vertical section is the blind hole structure of convex shape, and major diameter in upper box
Circular hole is identical as the internal diameter of major diameter circular hole in lower box, and upper box small-and-middle diameter circular hole is identical as the internal diameter of lower box small-and-middle diameter circular hole, obtains
Box body cavity vertical section is the shearing force box of I-shaped structure to get being I-shaped asphalt sample to vertical section, reduces pitch
The internal stress and sample forced area of sample, reduce the horizontal force in cohesive strength continuous mode, so that measurement difficulty is reduced,
The accuracy and accuracy of measurement result are improved, while being reduced in the horizontal force loading procedure that cohesive strength measures, pitch sample
Product whole risk to fall off out of circular hole due to viscosity is excessive.
In addition, due to not having temperature control equipment in strain controlling formula direct shear apparatus, asphalt sample insulating process should be
It is carried out beside strain controlling formula direct shear apparatus, to guarantee that asphalt sample can carry out shearing test after taking out in heat-preserving equipment immediately,
To reduce influence of the temperature difference to continuous mode of asphalt sample, the accuracy of measuring method is further increased.
Above-mentioned a kind of pitch cohesive strength measuring method, which is characterized in that big hole is under in upper box described in step 1
The internal diameter of big hole is 40mm in box, in upper box the height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box, and the internal diameter of small sircle hole is 20mm in small sircle hole and lower box in the upper box,
Height is 10mm.The structure size of above-mentioned upper box and lower box, it is ensured that the vertical section of asphalt sample is I-shaped structure, and on
Box and the structure size of asphalt sample in lower box are completely the same, further reduce the internal stress of asphalt sample, improve measurement
As a result accuracy；In addition, the shearing force box of the upper box of above structure size and lower box composition, is applicable to most strain controllings
Formula direct shear apparatus expands the equipment use scope of the method for the present invention.
A kind of above-mentioned pitch cohesive strength measuring method, which is characterized in that pitch described in step 2 be matrix pitch or
Modified pitch.Measuring method of the invention is suitable for common matrix pitch or modified pitch, has a wide range of application, practical value
It is high.
Above-mentioned a kind of pitch cohesive strength measuring method, which is characterized in that heat preservation described in step 2 is kept the temperature using water-bath
Or baking oven heat preservation.Above-mentioned heat preserving mode can accurate temperature controlling, it is easy to control and relatively conventional, further reduced present invention side
The implementation difficulty of method.
Above-mentioned a kind of pitch cohesive strength measuring method, which is characterized in that will be slowly after the heating of pitch described in step 2
It pours into and is coated in the shearing force box of interleaving agent, and ensure that the pitch after heating is fully filled with the big hole of lower box in shearing force box.It is above-mentioned
Operation avoids in the pitch after gas inclusions enter heating and forms cavity in the big hole of lower box, under causing in continuous mode
The restraining force that asphalt sample is subject in box becomes smaller to generate obscission.
A kind of above-mentioned pitch cohesive strength measuring method, which is characterized in that the range of dynamometry dial gauge described in step 3
For 10mm, scale division value 0.01mm.The dynamometry dial gauge of above-mentioned specification is relatively conventional, and range and scale division value have been all satisfied measurement
The requirement of process further increases the degree easy to accomplish of the method for the present invention.
Above-mentioned a kind of pitch cohesive strength measuring method, which is characterized in that the velocity of rotation of handwheel described in step 4 is
10s/ weeks.The velocity of rotation had both facilitated control, also ensured the reliable and stable of measurement result.
Compared with the prior art, the present invention has the following advantages:
1, the present invention is based on shearing force box of the material property of pitch to strain controlling formula direct shear apparatus to improve, and obtains box body
Cavity vertical section is the shearing force box of I-shaped structure to get being I-shaped asphalt sample to vertical section, to reduce pitch
The internal stress and forced area of sample avoid pitch failure mechanics and are destroyed by vertical direct stress acting shear, reduce cohesive strength
Horizontal force in continuous mode improves the accuracy and accuracy of measurement result, reduces simultaneously to reduce measurement difficulty
In the horizontal force loading procedure of cohesive strength measurement, asphalt sample whole risk to fall off out of circular hole because viscosity is excessive due to.
2, the present invention is improved by the structure of the shearing force box to strain controlling formula direct shear apparatus in the prior art, thus
It realizes the direct measurement to pitch cohesive strength, compensates for deficiency of the existing test method in terms of pitch cohesive strength measurement, not only
Cost of determination is effectively reduced, and measuring method is simple, it is easy to operate.
3, measurement process conditions such as temperature of the invention and hand wheel rotating speed are stably and controllable, therefore can select unified work
Skill condition tests the cohesive strength of variety classes pitch, facilitates the evaluation of the cohesive strength to variety classes pitch, improves
The accuracy and reliability of test result, so that the cohesive strength test result of variety classes pitch has comparativity.
Technical solution of the present invention is described in further detail below by drawings and examples.
Detailed description of the invention
Fig. 1 is the main view sectional view for the improved strain controlling formula direct shear apparatus that the present invention uses.
Fig. 2 is the top cross-sectional view of the cutting system for the improved strain controlling formula direct shear apparatus that the present invention uses.
Fig. 3 is the top view of the dynamometric system for the improved strain controlling formula direct shear apparatus that the present invention uses.
Description of symbols
1-pushes seat；2-lower boxes；3-pitches；
4-upper boxes；5-dynamometers；6-dynamometry dial gauges；
7-pin holes；8-handwheels；9-balls.
Specific embodiment
As shown in Figure 1, Figure 2 and Figure 3, the improved strain controlling formula direct shear apparatus that the present invention uses include cutting system and
Dynamometric system, the shearing force box for holding pitch 3 in the cutting system are made of the lower box 2 and upper box 4 worked in coordination, institute
It states to correspond on lower box 2 and upper box 4 and offers pin hole 7, Fixed latches pass through pin hole 7 for lower box 2 and the fixed company of upper box 4
It connects, the bottom of the shearing force box is equipped with ball 9, and shearing force box is under the action of rotating handwheel 8 along horizontal rolling, the dynamometry system
System includes dynamometer 5 and the dynamometry dial gauge 6 being arranged on dynamometer 5.The improved strain controlling formula that the present invention uses is straight
Cut the working principle of instrument measurement pitch cohesive strength are as follows: it is driven by rotation handwheel 8 and seat 1 is pushed to act on the lower box 2 of shearing force box,
And upper applied force, so that the shearing force box equipped with pitch be driven to roll in the horizontal direction, makes in the lower box 2 of shearing force box from horizontal direction
Steel ball on upper box 4 is contacted and is withstood on dynamometer 5, and the horizontal force action direction being applied on lower box 2 and dynamometer 5 are to upper box
4 force direction causes in shearing force box on the contrary, so that upper box 4 and lower box 2 make counter motion along same rectilinear direction
The shearing force that pitch bears upper box 4 and lower 2 counter motion of box generates, until pitch destroys under shearing force, thus
Pitch maximum shear deformation reading is obtained according to the reading of dynamometry dial gauge 6.
Embodiment 1
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be 15mm and big hole in the height of graduation mark be 10mm,
The height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is 20mm in the upper box 4, height
It is 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 50# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 140 DEG C
The big hole that 50# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 1.5h, then keeps the temperature 1.5h under 60 DEG C of water-bath heat-retaining condition at 20 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 50# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 85 weeks, and the reading for recording dynamometry dial gauge 6 is as 50# matrix pitch maximum shear deformation reading
385(0.01mm)；
Step 5: shearing force box to be removed to and taken out 50# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 50# matrix pitch maximum shear obtained in step 4,50# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 50# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 385.00
(0.01mm)=0.738MPa=738kPa, wherein τ is 50# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 50# matrix pitch maximum shear, unit 0.01mm.
Embodiment 2
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 50# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 150 DEG C
The big hole that 50# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of water-bath heat-retaining condition at 22 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 50# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 85 weeks, and the reading for recording dynamometry dial gauge 6 is as 50# matrix pitch maximum shear deformation reading
377.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 50# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 50# matrix pitch maximum shear obtained in step 4,50# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 50# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 377.00
(0.01mm)=0.723MPa=723kPa, wherein τ is 50# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 50# matrix pitch maximum shear, unit 0.01mm.
Embodiment 3
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The pitch isolation is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 50# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 160 DEG C
The big hole that 50# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 59.5 DEG C~60.5 DEG C of water-bath heat-retaining condition at 25 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 50# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 83 weeks, and the reading for recording dynamometry dial gauge 6 is as 50# matrix pitch maximum shear deformation reading
382.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 50# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 50# matrix pitch maximum shear obtained in step 4,50# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 50# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 382.00
(0.01mm)=732kPa=0.732MPa, wherein τ is 50# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 50# matrix pitch maximum shear, unit 0.01mm.
Embodiment 4
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 70# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 140 DEG C
The big hole that 70# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 1.6h, then keeps the temperature 1.5h under 60 DEG C of water-bath heat-retaining condition at 22 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 70# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 77 weeks, and the reading for recording dynamometry dial gauge 6 is as 70# matrix pitch maximum shear deformation reading
340.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 70# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 70# matrix pitch maximum shear obtained in step 4,70# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 70# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 340.00
(0.01mm)=652kPa=0.652MPa, wherein τ is 70# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 70# matrix pitch maximum shear, unit 0.01mm.
Embodiment 5
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 70# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 150 DEG C
The big hole that 70# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 1.5h, then keeps the temperature 1.6h under 60 DEG C of water-bath heat-retaining condition at 25 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 70# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 74 weeks, and the reading for recording dynamometry dial gauge 6 is as 70# matrix pitch maximum shear deformation reading
331.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 70# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 70# matrix pitch maximum shear obtained in step 4,70# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 70# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 331.00
(0.01mm)=635kPa=0.635MPa, wherein τ is 70# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 70# matrix pitch maximum shear, unit 0.01mm.
Embodiment 6
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 70# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 160 DEG C
The big hole that 70# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of water-bath heat-retaining condition at 20 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 70# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 72 weeks, and the reading for recording dynamometry dial gauge 6 is as 70# matrix pitch maximum shear deformation reading
324.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 70# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 70# matrix pitch maximum shear obtained in step 4,70# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 70# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 324.00
(0.01mm)=621kPa=0.621MPa, wherein τ is 70# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 70# matrix pitch maximum shear, unit 0.01mm.
Embodiment 7
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The pitch isolation is mixed with by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 90# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 140 DEG C
The big hole that 90# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of water-bath heat-retaining condition at 25 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 90# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 59 weeks, and the reading for recording dynamometry dial gauge 6 is as 90# matrix pitch maximum shear deformation reading
312.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 90# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 90# matrix pitch maximum shear obtained in step 4,90# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 90# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 312.00
(0.01mm)=598kPa=0.598MPa, wherein τ is 90# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 90# matrix pitch maximum shear, unit 0.01mm.
Embodiment 8
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed with by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 90# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 150 DEG C
The big hole that 90# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of water-bath heat-retaining condition at 20 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 90# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 55 weeks, and the reading for recording dynamometry dial gauge 6 is as 90# matrix pitch maximum shear deformation reading
305.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 50# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 90# matrix pitch maximum shear obtained in step 4,90# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 90# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 305.00
(0.01mm)=585kPa=0.585MPa, wherein τ is 90# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 90# matrix pitch maximum shear, unit 0.01mm.
Embodiment 9
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:1；
Step 2: 90# matrix pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 160 DEG C
The big hole that 90# matrix pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 1.5h, then keeps the temperature 1.5h under 60 DEG C of water-bath heat-retaining condition at 22 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after 90# base is housed
The shearing force box of matter pitch rolls in the horizontal direction, until the steel ball on upper box 4 contacts dynamometer 5, then adjusts on dynamometer 5
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 simultaneously observes the pointer of dynamometry dial gauge 6, and when the pointer of dynamometry dial gauge 6 does not readvance and retreats, then sample has been
Failure by shear amounts to rotation 61 weeks, and the reading for recording dynamometry dial gauge 6 is as 50# matrix pitch maximum shear deformation reading
318.00(0.01mm)；
Step 5: shearing force box to be removed to and taken out 90# matrix pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to 90# matrix pitch maximum shear obtained in step 4,90# matrix pitch is calculated and cuts
Cut through value of shearing i.e. 90# matrix pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 318.00
(0.01mm)=610kPa=0.610MPa, wherein τ is 90# matrix pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for 90# matrix pitch maximum shear, unit 0.01mm.
Embodiment 10
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:2；
Step 2: SBS modified pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 140 DEG C
The big hole that SBS modified pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 1.5h, then keeps the temperature 1.5h under 60 DEG C of baking oven heat-retaining condition at 20 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after change equipped with SBS
Property pitch shearing force box roll in the horizontal direction, until upper box 4 on steel ball contact dynamometer 5, then adjust dynamometer 5 on
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 and the pointer for observing dynamometry dial gauge 6, it is specified that hand when the pointer of dynamometry dial gauge 6 is continuously advanced with the rotation of handwheel 8
The reading of dynamometry dial gauge 6 at 8 rotation of wheel 100 weeks is 392.00 (0.01mm) of SBS modified pitch maximum shear deformation reading；
Step 5: shearing force box to be removed to and taken out SBS modified pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to SBS modified pitch maximum shear obtained in step 4, SBS modified pitch is calculated and cuts
Cut through value of shearing i.e. SBS modified pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 392.00
(0.01mm)=752kPa=0.752MPa, wherein τ is SBS modified pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for SBS modified pitch maximum shear, unit 0.01mm.
Embodiment 11
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:2；
Step 2: SBS modified pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 150 DEG C
The big hole that SBS modified pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of baking oven heat-retaining condition at 22 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after change equipped with SBS
Property pitch shearing force box roll in the horizontal direction, until upper box 4 on steel ball contact dynamometer 5, then adjust dynamometer 5 on
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 and the pointer for observing dynamometry dial gauge 6, it is specified that hand when the pointer of dynamometry dial gauge 6 is continuously advanced with the rotation of handwheel 8
The reading of dynamometry dial gauge 6 at 8 rotation of wheel 100 weeks is 387.00 (0.01mm) of SBS modified pitch maximum shear deformation reading；
Step 5: shearing force box to be removed to and taken out SBS modified pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to SBS modified pitch maximum shear obtained in step 4, SBS modified pitch is calculated and cuts
Cut through value of shearing i.e. SBS modified pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 387.00
(0.01mm)=742kPa=0.742MPa, wherein τ is SBS modified pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for SBS modified pitch maximum shear, unit 0.01mm.
Embodiment 12
The method of the present embodiment the following steps are included:
Step 1: by the upper box 4 and lower 2 aligned fit of box in improved strain controlling formula direct shear apparatus and in corresponding bolt
Fixed latches are inserted into hole 7, are assembled into shearing force box, then coat Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is described
It is provided with and is made of major diameter circular hole and the perforation of path circular hole and vertical section be the circular hole of convex shape in upper box 4, in the lower box 2
Be provided be made of major diameter circular hole and path circular hole and vertical section be convex shape blind hole；Big hole and lower box 2 in the upper box 4
The internal diameter of middle big hole is 40mm, in upper box 4 height of big hole be in 15mm and big hole bottom surface to the height of graduation mark
For 10mm, the height of big hole is 10mm in lower box 2, and the internal diameter of small sircle hole and small sircle hole in lower box 2 is in the upper box 4
20mm is highly 10mm；The Bituminous Isolation Agent is mixed by talcum powder and glycerine according to the mass ratio of 1:2；
Step 2: SBS modified pitch is heated to slowly to pour into step 1 the shearing for being coated with Bituminous Isolation Agent after 160 DEG C
The big hole that SBS modified pitch at graduation mark in box, and after ensuring to heat is fully filled with lower box 2 in shearing force box is subsequently placed in
Cooling 2h, then keeps the temperature 2h under 60 DEG C of baking oven heat-retaining condition at 25 DEG C；
Step 3: rotation handwheel 8 drives and seat 1 is pushed to push lower box 2, drive it is warm in step 2 after change equipped with SBS
Property pitch shearing force box roll in the horizontal direction, until upper box 4 on steel ball contact dynamometer 5, then adjust dynamometer 5 on
The reading of dynamometry dial gauge 6 is zeroed；The range of the dynamometry dial gauge 6 is 10mm, scale division value 0.01mm；
Step 4: taking out the Fixed latches of shearing force box, stopwatch is started, while with 10s/ weeks velocity of rotation uniform rotation hand
Wheel 8 and the pointer for observing dynamometry dial gauge 6, it is specified that hand when the pointer of dynamometry dial gauge 6 is continuously advanced with the rotation of handwheel 8
The reading of dynamometry dial gauge 6 at 8 rotation of wheel 100 weeks is 389.00 (0.01mm) of SBS modified pitch maximum shear deformation reading；
Step 5: shearing force box to be removed to and taken out SBS modified pitch, after cleaning shearing force box after handwheel 8 is reversed go back to original position
Original position is put back to, is then deformed and is read according to SBS modified pitch maximum shear obtained in step 4, SBS modified pitch is calculated and cuts
Cut through value of shearing i.e. SBS modified pitch cohesive strength τ=C of bad whend·Rm=1.918kPa/0.01mm × 389.00
(0.01mm)=746kPa=0.746MPa, wherein τ is SBS modified pitch cohesive strength, unit kPa, CdFor dynamometer correction
Coefficient, unit kPa/0.01mm, RmIt deforms and reads for SBS modified pitch maximum shear, unit 0.01mm.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill
Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention
Protection scope in.
Claims (7)
1. a kind of pitch cohesive strength measuring method, which is characterized in that method includes the following steps:
Step 1: by improved strain controlling formula direct shear apparatus upper box (4) and lower box (2) aligned fit be assembled into shearing
Then box coats Bituminous Isolation Agent on the inner wall of shearing force box and bottom surface；It is provided in the upper box (4) by major diameter circular hole and small
Diameter circular hole perforation composition and vertical section are the circular hole of convex shape, are provided in the lower box (2) by major diameter circular hole and path circle
Hole composition and vertical section be convex shape blind hole, and in upper box (4) major diameter circular hole and major diameter circular hole in lower box (2) internal diameter phase
Together, upper box (4) small-and-middle diameter circular hole is identical as the internal diameter of lower box (2) small-and-middle diameter circular hole；
Step 2: pitch was heated to pouring into step 1 after 140 DEG C~160 DEG C in the shearing force box for being coated with Bituminous Isolation Agent to quarter
It spends at line, is subsequently placed at 20 DEG C~25 DEG C cooling 1.5h or more, 1.5h~2.0h is then kept the temperature under conditions of 60 DEG C；
Push seat (1) to push lower box (2) Step 3: rotation handwheel (8) drives, thus drive it is warm in step 2 after be equipped with
The shearing force box of pitch rolls in the horizontal direction, until the steel ball on upper box (4) contacts dynamometer (5), then adjusts dynamometer (5)
On dynamometry dial gauge (6) reading zero；
Step 4: take out the Fixed latches of shearing force box, stopwatch is started, while uniform rotation handwheel (8) and observing dynamometry dial gauge
(6) pointer, when the pointer of dynamometry dial gauge (6) does not readvance and retreats, then sample survey by failure by shear, record
The reading of power dial gauge (6) is deformed as pitch maximum shear and is read, when the pointer of dynamometry dial gauge (6) turns with handwheel (8)
, it is specified that the reading of the dynamometry dial gauge (6) when handwheel (8) rotates 100 weeks is the deformation of pitch maximum shear when moving and being continuously advanced
Reading；The reading of the dynamometry dial gauge (6) is accurate to 0.01mm；
Step 5: shearing force box to be removed to and taken out pitch after handwheel (8) is reversed go back to original position, original position is put back to after cleaning shearing force box,
Then it is deformed and is read according to pitch maximum shear obtained in step 4, calculate value of shearing, that is, pitch when pitch failure by shear
Cohesive strength τ=Cd·Rm, wherein τ is pitch cohesive strength, unit kPa, CdFor dynamometer correction coefficient, unit kPa/
0.01mm, RmIt deforms and reads for pitch maximum shear, unit 0.01mm.
2. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that upper box described in step 1
(4) major diameter circular hole and the internal diameter of major diameter circular hole in lower box (2) are 40mm in, and the height of major diameter circular hole is 15mm in upper box (4)
And the height of graduation mark is 10mm in major diameter circular hole, the height of major diameter circular hole is 10mm in lower box (2), and the upper box (4) is medium and small
The internal diameter of diameter circular hole and lower box (2) small-and-middle diameter circular hole is 20mm, is highly 10mm.
3. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that pitch described in step 2 is
Matrix pitch or modified pitch.
4. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that heat preservation described in step 2 is adopted
It is kept the temperature with water-bath heat preservation or baking oven.
5. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that pitch described in step 2 adds
It slowly to pour into and be coated in the shearing force box of Bituminous Isolation Agent after heat, and ensure that the pitch after heating is fully filled in shearing force box lower box
(2) major diameter circular hole.
6. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that dynamometry hundred described in step 3
The range for dividing table (6) is 10mm, scale division value 0.01mm.
7. a kind of pitch cohesive strength measuring method according to claim 1, which is characterized in that handwheel described in step 4
(8) velocity of rotation is 10s/ weeks.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114459995A (en) * | 2022-03-02 | 2022-05-10 | 仝付强 | Road construction pitch adhesion testing arrangement |
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| CN114459995B (en) * | 2022-03-02 | 2023-09-29 | 仝付强 | Road construction asphalt adhesion testing arrangement |
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