CN103604743A - Testing apparatus and testing method for testing interlayer connection strength of pavement layers - Google Patents
Testing apparatus and testing method for testing interlayer connection strength of pavement layers Download PDFInfo
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- CN103604743A CN103604743A CN201310528755.4A CN201310528755A CN103604743A CN 103604743 A CN103604743 A CN 103604743A CN 201310528755 A CN201310528755 A CN 201310528755A CN 103604743 A CN103604743 A CN 103604743A
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Abstract
The invention discloses a testing apparatus and a testing method for testing interlayer connection strength of pavement layers. The testing apparatus comprises a pavement layer sample, a vertical pressure applying device, and a torsional shearing device; the vertical pressure applying device is arranged above the pavement layer sample and the torsional shearing device; the vertical pressure applying device is used for applying vertical pressure on to the pavement layer sample; the pavement layer sample is composed of an upper layer pavement sample, a waterproof bonding layer sample and a lower layer pavement sample; the upper layer pavement sample comprises a circular ring-shaped core sample and an inner cylinder sample; the torsional shearing device is used for clamping the upper layer pavement sample firmly in horizontal plane, and applying torque onto the upper layer pavement sample; and the torsional shearing device is provided with a torque wrench determinator. The testing apparatus and the testing method are capable of realizing torsional shear failure under the action of variable positive pressure; in addition, elimination of influences of mixture size on testing results is realized via a plurality of times of processing of testing samples; the testing apparatus and the testing method are designed to accord with theory and failure reality; and operation is convenient.
Description
Technical field
The invention belongs to pavement engineering equipment technical field, be specifically related to a kind of mat formation layer by layer between the proving installation of linking intensity and the method for testing that adopts described proving installation.
Background technology
The asphalt concrete pavement especially interlayer articulation issues of deck paving is the key factor that affects the whole usability of structural sheet.Mechanical analysis result shows, interlayer state by transfer to continuously smooth after, interior or the interlayer shear stress layer by layer of mating formation is how much multiples growths, in China's asphalt pavement design criterion, during pavement structure Thickness Design, take between mating formation is layer by layer prerequisite continuously, and the coupled situation on road surface do not meet theory hypothesis after practice of construction, also lack reasonable, effective means evaluates and tests simultaneously, the shortage of checkout equipment and detection method causes the state between mating formation layer by layer to lack effective quality control, causes passing, embraces, the earlier period damage problem such as rut takes place frequently.
The failure mode that interlayer connects is divided into following three classes: between (1) water-proof tack coat and decking, come off; (2) mat formation and come off between layer and water-proof tack coat; (3) water-proof tack coat autoclasia causes interlayer to connect inefficacy.The evaluation of interlayer linking intensity has three kinds of shear resistance, pull strength and torsional shear strengths, need to test with corresponding direct shear, direct drawing, torsional shear equipment, as far back as 1978, start the research of inter-layer shearing strength abroad, and focus on very much the exploitation of instrument, the measurement interlayer connecting device that existing market exists can be divided three classes substantially, direct shear class, press-cutting class and tiltedly shear kind equipment.The size device dependent of test specimen, there are cube, right cylinder etc., loading environment is different such as 5mm/min, 10mm/min, 50mm/min etc. also, and in addition, some departments such as have also adopted direct stretching, wedge shape to shear and turn round to cut is used as to study at the testing equipment.
2005 American National highway Cooperative Research Program (NCHRP) initiated the research (NCHRP Project9-40) of a definite sticking material, international material and structural test research association (RILEM) have also initiated similar plan, China there is no at present generally acknowledged mat formation layer by layer between test method and the evaluation criterion of coupling performance simulating, do not form unified checkout equipment yet, there is at present Some Universities to disclose instrument and the method for relevant test tack coat coupling performance simulating with research department, yet this type of testing apparatus has heavy construction complexity, test result shows that repdocutbility is poor, the on-the-spot operability that lacks, actual failure mode and theoretical modeling have gap, be difficult to realize the defects such as unification of bridge floor tack coat indoor and outdoor means of testing.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention proposes a kind of meet theoretical with destroy actual, easy and simple to handle, consideration size effect affects layer coupling performance simulating of mating formation mat formation layer by layer between the proving installation of linking intensity.
To achieve these goals, the present invention adopts following technical scheme:
A proving installation for linking intensity between mating formation layer by layer, comprises layer sample of mating formation, pressure at right angle bringing device and torsional shear device; Pressure at right angle bringing device is positioned at the top of mat formation layer sample and torsional shear device, and pressure at right angle bringing device applies pressure at right angle to the described layer sample of mating formation; Layer sample of mating formation is comprised of Upper Pavement sample, water-proof tack coat sample and the lower floor sample of mating formation, and Upper Pavement layer sample comprises a circular core and an interior cylinder sample; Torsional shear device clamps Upper Pavement layer sample and described Upper Pavement layer sample is applied to moment of torsion in surface level, is connected with torque spanner analyzer on torsional shear device.
Further, described pressure at right angle bringing device comprises push rod and top board, and push rod is positioned at top board top and is connected with top board, and the top of push rod is connected with pressing machine.
Further, the bottom shape spherical in shape of described push rod, guiding fixed mechanism is set between push rod and top board, this guiding fixed mechanism comprises the first orienting lug and the second orienting lug, the second orienting lug is connected with top board, at the middle part of the second orienting lug, be provided with the ball recess suitable with the bottom of described push rod, the first orienting lug is positioned at the top of the second orienting lug, at the middle part of the first orienting lug, offer push rod perforation, the bottom of push rod is positioned at ball recess inside and is upward through push rod perforation, on the first orienting lug and the second orienting lug, be provided with fixing threaded hole and fix by screw.
Further, described torsional shear device comprises annular holder, is symmetrically arranged with two force application rods on the lateral wall of annular holder, and described force application rod is connected with torque spanner analyzer.
Further, described annular holder, comprises and cooperatively interacts and be all annular the first fastening block of semicircle and the second fastening block, between the first fastening block and the second fastening block, adopt and be articulated and connected, two force application rods are separately positioned on the first fastening block and the second fastening block.
Another object of the present invention be to propose a kind of adopt above-mentioned mat formation layer by layer between the method for testing of proving installation of linking intensity, it adopts following technical scheme:
(1) the mat formation three-decker of layer sample of moulding successively is in vertical direction from top to bottom Upper Pavement sample, water-proof tack coat sample and the lower floor sample of mating formation successively;
(2) adopt the first core cylinder that internal diameter is R to get core to Upper Pavement sample, in the middle of brea bed, adopt angle grinding machine to grind 3-5mm degree of depth deep hole, at deep hole place, adopt the second core cylinder that external diameter is r to get core, Upper Pavement sample is prepared as to circular core and interior cylinder sample, and the end face of interior cylinder sample is lower than the end face 3-5mm of circular core;
(3) torsional shear device clamps the lateral wall of circular core, in the contact site of the lateral wall of torsional shear device and circular core, is coated with adhesive curing;
(4) pressure at right angle bringing device applies pressure at right angle F to the described layer sample of mating formation, F calculates by the theory of finite element, simultaneously torsional shear device reverses to >=90 ° according to the torsion speed of 1.6 °/min-2.0 °/min, guarantee that Upper Pavement sample and water-proof tack coat sample occur to depart from destruction, record the maximum torque T in twist process;
(5) according to maximum torque T, calculate layer shearing strength for sample water-proof tack coat of mating formation to be measured, formula is as follows:
In formula:
The shearing strength of σ c-water-proof tack coat, unit is MPa, T-maximum torque, unit is Nm, A-ring cross-section area, unit is mm
2, the internal diameter of R-the first core cylinder, unit is mm, the external diameter of r-the second core cylinder, unit is mm.
In above-mentioned steps (4), the torsion speed of torsional shear device is 1.8 °/min.
Advantage of the present invention is:
The present invention is dimensioned to the paving structure layer of moulding in testing laboratory or on-site cutting the Upper Pavement layer sample connecting by original state in accordance with regulations, adopt annular holder to bond to Upper Pavement layer sample fixing, when top applies controlled pressure at right angle, thereby by torsional shear device, Upper Pavement layer sample applied to moment of torsion and on water-proof binding bed interface, produce torsional shear stress, the maximal value of mating formation and twisting between layer while destroying by recording test specimen Upper Pavement Ceng Yu to be measured lower floor, calculate under different positive pressure states, the mat formation shear strength of interlayer, with traditional mat formation layer by layer between linking intensity proving installation and method compare, this proving installation and method of testing more meet the layer interlayer under Vehicle Load of mating formation and connect the reality of destroying, consider size effect and destroy homogeneity, sample dimensions design is more reasonable with load mode, the load modes such as direct shear have been avoided because produce in the layer bottom of mating formation " tear failure " that moment of flexure causes, the shearing strength value recording is closer to actual value.
Accompanying drawing explanation
Fig. 1 be in the present invention, mat formation layer by layer between the fractionation structural drawing of proving installation of linking intensity;
Fig. 2 be in the present invention, mat formation layer by layer between the assembling assumption diagram of proving installation of linking intensity;
Fig. 3 be in Fig. 2, mat formation layer by layer between the side view of proving installation of linking intensity;
Fig. 4 is the structural representation of mating formation before layer sample machine-shaping;
Fig. 5 is the structural representation of mating formation after layer sample machine-shaping;
Fig. 6 is the structural representation of top board in pressure at right angle bringing device of the present invention;
Fig. 7 is the structural representation of push rod in pressure at right angle bringing device of the present invention;
Fig. 8 is the structural representation of the first fastening block in torsional shear device of the present invention;
Fig. 9 is the structural representation of the second fastening block in torsional shear device of the present invention;
Figure 10 is the structural representation of hinge bar in torsional shear device of the present invention.
In figure, 1, lower floor's sample of mating formation, 2, Upper Pavement layer sample, 2-1, circular core, 2-2, interior cylinder sample, the 3, first fastening block, 4, the second fastening block, the 5, first bearing pin, the 6, second bearing pin, 7, hinge bar, 8, nut, 9, force application rod, 10, top board, 11, push rod, 12-1, the first orienting lug, 12-2, the second orienting lug, 13, screw, 14, water-proof tack coat sample.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
Shown in Fig. 1 Fig. 9, a kind of mat formation layer by layer between the proving installation of linking intensity, comprise layer sample of mating formation, pressure at right angle bringing device and torsional shear device.Pressure at right angle bringing device is positioned at the top of mat formation layer sample and torsional shear device, and pressure at right angle bringing device applies pressure at right angle to layer sample of mating formation, as shown in Figure 1.
Pressure at right angle bringing device comprises push rod 11 and top board 10, and push rod is positioned at top board top and is connected with top board, and the top of push rod is connected with the pressing machine that essence is controlled, as UTM-100, for pressure at right angle bringing device provides accurate forward can changing pressure.Concrete, the bottom shape spherical in shape of push rod 11 as shown in Figure 7, arranges guiding fixed mechanism between push rod 11 and top board 10.This guiding fixed mechanism comprises the first orienting lug 12-1 and the second orienting lug 12-2, the second orienting lug 12-2 is connected with top board 10, as shown in Figure 6, at the middle part of the second orienting lug 12-2, be provided with the ball recess suitable with the bottom of described push rod, the first orienting lug 12-1 is positioned at the top of the second orienting lug 12-2, at the middle part of the first orienting lug, offer push rod perforation, the bottom of push rod is positioned at ball recess inside and is upward through push rod perforation, on the first orienting lug and the second orienting lug 12-2, be provided with fixing threaded hole fixing by screw 13, pressure at right angle bringing device can guarantee to provide vertical positive pressure for layer sample of mating formation.
Layer sample of mating formation is comprised of Upper Pavement sample 2, the water-proof tack coat sample 14He lower floor sample 1 of mating formation.Upper Pavement layer sample 2, adopt the first core cylinder of internal diameter R to get core, adopt angle grinding machine with angle grinding machine, to grind 3-5mm degree of depth deep hole in the middle of brea bed, in deep hole portion, locate, adopt the second core cylinder of external diameter r to get core, Upper Pavement layer sample 2 is prepared as to circular core 2-1 and interior cylinder sample 2-2, and the end face of interior cylinder sample 2-2 is lower than circular core 2-1 end face 3-5mm, as shown in Figure 5.Mat formation layer sample can be in testing laboratory moulding or formed by the paving structure layer of on-site cutting.
Torsional shear device clamps Upper Pavement layer sample on the one hand in surface level, on the other hand Upper Pavement layer sample applied to moment of torsion, in twist process, record the maximal value that test specimen Upper Pavement Ceng Yu to be measured lower floor mats formation and twists while destroying between layer, as shown in Figure 2.
Torsional shear device comprises annular holder, is symmetrically arranged with two force application rods on the lateral wall of annular holder, and described force application rod is connected with torque spanner analyzer.Annular holder, comprise and cooperatively interact and be all annular the first fastening block 3 of semicircle and the second fastening block 4, between the first fastening block and the second fastening block, adopt and be articulated and connected, two force application rods 9 are separately positioned on the first fastening block and the second fastening block, on force application rod 9, be connected with torque spanner analyzer, the combined diameter of the first fastening block 3 and the second fastening block 4 is R.As shown in Fig. 8, Fig. 9, Figure 10, in order to realize the connection of the first fastening block 3 and the second fastening block 4, also need the first bearing pin 5, the second bearing pin 6, hinge bar 7 and nut 8, hinge bar 7 and nut 8 coordinate.
The method of testing that adopts the proving installation of linking intensity between mating formation layer by layer in the present invention, step is as follows:
(1) the mat formation three-decker of layer sample of moulding successively in vertical direction, is from top to bottom Upper Pavement sample, water-proof tack coat sample and the lower floor sample of mating formation successively, and Upper Pavement layer sample is square shape;
(2) adopt the first core cylinder that internal diameter is R to get core to Upper Pavement sample, in the middle of brea bed, adopt angle grinding machine to grind 3-5mm degree of depth deep hole, at deep hole place, adopt the second core cylinder that external diameter is r to get core, Upper Pavement sample is prepared as to circular core and interior cylinder sample, and the end face of interior cylinder sample is lower than the end face 3-5mm of circular core;
(3) torsional shear device clamps the lateral wall of circular core, in the contact site of the lateral wall of torsional shear device and circular core, is coated with adhesive curing;
(4) pressure at right angle bringing device applies pressure at right angle F to the described layer sample of mating formation, F calculates by the theory of finite element, simultaneously torsional shear device reverses to >=90 ° according to the torsion speed of 1.6 °/min-2.0 °/min, guarantee that Upper Pavement sample and water-proof tack coat sample occur to depart from destruction, record the maximum torque T in twist process;
(5) according to maximum torque T, calculate layer shearing strength for sample water-proof tack coat of mating formation to be measured, formula is as follows:
In formula:
The shearing strength of σ c-water-proof tack coat, unit is MPa, T-maximum torque, unit is Nm, A-ring cross-section area, unit is mm
2, the internal diameter of R-the first core cylinder, unit is mm, the external diameter of r-the second core cylinder, unit is mm.
In above-mentioned steps (4), the torsion speed of torsional shear device is 1.8 °/min.
The torsional shear that the present invention can realize under variable positive pressure is destroyed, and by the repeatedly processing to test sample, has eliminated the impact of compound size and test result simultaneously.
Certainly; more than explanation is only preferred embodiment of the present invention; the present invention is not limited to enumerate above-described embodiment; should be noted that; any those of ordinary skill in the art are under the instruction of this instructions; that makes is allly equal to alternative, obvious form of distortion, within all dropping on the essential scope of this instructions, ought to be subject to protection of the present invention.
Claims (7)
1. between mating formation layer by layer, a proving installation for linking intensity, is characterized in that, comprises layer sample of mating formation, pressure at right angle bringing device and torsional shear device; Pressure at right angle bringing device is positioned at the top of mat formation layer sample and torsional shear device, and pressure at right angle bringing device applies pressure at right angle to the described layer sample of mating formation; Layer sample of mating formation is comprised of Upper Pavement sample, water-proof tack coat sample and the lower floor sample of mating formation, and Upper Pavement layer sample comprises a circular core and an interior cylinder sample; Torsional shear device clamps Upper Pavement layer sample and described Upper Pavement layer sample is applied to moment of torsion in surface level, is connected with torque spanner analyzer on torsional shear device.
According to claim 1 a kind of mat formation layer by layer between the proving installation of linking intensity, it is characterized in that, described pressure at right angle bringing device comprises push rod and top board, push rod is positioned at top board top and is connected with top board, the top of push rod is connected with pressing machine.
According to claim 2 a kind of mat formation layer by layer between the proving installation of linking intensity, it is characterized in that, the bottom shape spherical in shape of described push rod, guiding fixed mechanism is set between push rod and top board, this guiding fixed mechanism comprises the first orienting lug and the second orienting lug, the second orienting lug is connected with top board, at the middle part of the second orienting lug, be provided with the ball recess suitable with the bottom of described push rod, the first orienting lug is positioned at the top of the second orienting lug, at the middle part of the first orienting lug, offer push rod perforation, the bottom of push rod is positioned at ball recess inside and is upward through push rod perforation, on the first orienting lug and the second orienting lug, be provided with fixing threaded hole and fix by screw.
According to claim 1 a kind of mat formation layer by layer between the proving installation of linking intensity, it is characterized in that, described torsional shear device comprises annular holder, is symmetrically arranged with two force application rods on the lateral wall of annular holder, and described force application rod is connected with torque spanner analyzer.
According to claim 1 a kind of mat formation layer by layer between the proving installation of linking intensity, it is characterized in that, described annular holder, comprise and cooperatively interact and be all annular the first fastening block of semicircle and the second fastening block, between the first fastening block and the second fastening block, adopt and be articulated and connected, two force application rods are separately positioned on the first fastening block and the second fastening block.
Right to use require a kind of described in 1 mat formation layer by layer between the method for testing of proving installation of linking intensity, it is characterized in that comprising the steps:
(1) the mat formation three-decker of layer sample of moulding successively is in vertical direction from top to bottom Upper Pavement sample, water-proof tack coat sample and the lower floor sample of mating formation successively;
(2) adopt the first core cylinder that internal diameter is R to get core to Upper Pavement sample, in the middle of brea bed, adopt angle grinding machine to grind 3-5mm degree of depth deep hole, at deep hole place, adopt the second core cylinder that external diameter is r to get core, Upper Pavement sample is prepared as to circular core and interior cylinder sample, and the end face of interior cylinder sample is lower than the end face 3-5mm of circular core;
(3) torsional shear device clamps the lateral wall of circular core, in the contact site of the lateral wall of torsional shear device and circular core, is coated with adhesive curing;
(4) pressure at right angle bringing device applies pressure at right angle F to the described layer sample of mating formation, F calculates by the theory of finite element, simultaneously torsional shear device reverses to >=90 ° according to the torsion speed of 1.6 °/min-2.0 °/min, guarantee that Upper Pavement sample and water-proof tack coat sample occur to depart from destruction, record the maximum torque T in twist process;
(5) according to maximum torque T, calculate layer shearing strength for sample water-proof tack coat of mating formation to be measured, formula is as follows:
In formula:
The shearing strength of σ c-water-proof tack coat, unit is MPa, T-maximum torque, unit is Nm, A-ring cross-section area, unit is mm2, the internal diameter of R-the first core cylinder, unit is mm, the external diameter of r-the second core cylinder, unit is mm.
7. method of testing according to claim 6, is characterized in that, in described step (4), the torsion speed of torsional shear device is 1.8 °/min.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310528755.4A CN103604743A (en) | 2013-10-31 | 2013-10-31 | Testing apparatus and testing method for testing interlayer connection strength of pavement layers |
| CN201420094659.3U CN203672769U (en) | 2013-10-31 | 2014-03-04 | Testing device for interlayer connecting intensity of pavement layers |
| CN201410075818.XA CN103808654B (en) | 2013-10-31 | 2014-03-04 | A kind of proving installation of pave-load layer interlayer linking intensity and method of testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310528755.4A CN103604743A (en) | 2013-10-31 | 2013-10-31 | Testing apparatus and testing method for testing interlayer connection strength of pavement layers |
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| CN103604743A true CN103604743A (en) | 2014-02-26 |
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| CN201310528755.4A Pending CN103604743A (en) | 2013-10-31 | 2013-10-31 | Testing apparatus and testing method for testing interlayer connection strength of pavement layers |
| CN201410075818.XA Expired - Fee Related CN103808654B (en) | 2013-10-31 | 2014-03-04 | A kind of proving installation of pave-load layer interlayer linking intensity and method of testing |
| CN201420094659.3U Expired - Fee Related CN203672769U (en) | 2013-10-31 | 2014-03-04 | Testing device for interlayer connecting intensity of pavement layers |
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| CN201410075818.XA Expired - Fee Related CN103808654B (en) | 2013-10-31 | 2014-03-04 | A kind of proving installation of pave-load layer interlayer linking intensity and method of testing |
| CN201420094659.3U Expired - Fee Related CN203672769U (en) | 2013-10-31 | 2014-03-04 | Testing device for interlayer connecting intensity of pavement layers |
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| US7162929B2 (en) * | 2004-04-27 | 2007-01-16 | Board Of Regents, The University Of Texas System | System and method for field testing a tack coat layer |
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2013
- 2013-10-31 CN CN201310528755.4A patent/CN103604743A/en active Pending
-
2014
- 2014-03-04 CN CN201410075818.XA patent/CN103808654B/en not_active Expired - Fee Related
- 2014-03-04 CN CN201420094659.3U patent/CN203672769U/en not_active Expired - Fee Related
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| CN105973748A (en) * | 2016-06-08 | 2016-09-28 | 山西省交通科学研究院 | Bituminous mixture antistrip performance testing device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103808654B (en) | 2015-10-21 |
| CN103808654A (en) | 2014-05-21 |
| CN203672769U (en) | 2014-06-25 |
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Application publication date: 20140226 |