CN102507340A - Interlaminar shear strength parameter determination method of combined type pavement system - Google Patents
Interlaminar shear strength parameter determination method of combined type pavement system Download PDFInfo
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Abstract
The invention relates to an interlaminar shear strength parameter determination method of a combined type pavement system, which determines an interlaminar shear strength parameter of the combined type pavement system through a variable-angle oblique-shear test, and compared with a conventional interlaminar shear strength parameter determination method, the method has the characteristics of simple loading mode, quickness in result determination and the like, and the obtained result has higher accuracy, and the method can be used for the interlaminar shear performance design of the combined type pavement system. The method in the invention can be used for quick determination of an interlaminar shear strength parameter of cement concrete and bituminous concrete interfaces in concrete bridge floor flexible pavement, cement concrete pavement covered with a bitumen surface, fast underground passage concrete road plate additionally paved with a bitumen surface layer, airfield pavement covering project and the like. The interlaminar shear strength parameter determined by the method is explicit in meaning and is convenient for design, application and construction acceptance. The application of the method is convenient to deeply analyze interlaminar interface characteristics and law of the combined type pavement system, further improve the existing interlaminar shear performance evaluation system, and meanwhile, the method also provides a test analysis means for the selection and design of interlaminar materials of the combined type pavement system.
Description
Technical field
The invention belongs to highway, urban road and airport engineering field, be specifically related to a kind of combined type system interlaminar shear strength parametric measurement method of mating formation.
Background technology
Highway, urban road and airport engineering etc. will have many pavings to face problems such as reconstruction, enlarging at present; Wherein will be referred to many composite pavement structures; Be existing Concrete Overlays asphalt overlay, concrete bridge deck will overlay asphalt mixture surfacing in order to improve road-ability on existing concrete slab simultaneously.Existing Concrete Overlays asphalt overlay and concrete bridge deck pavement structure all belong to combined type paving structure system.When carrying out combined type paving structure System Design, the interlayer design is one of important link of whole System Design.Design focal point is interlayer shear between system layer and common combined type is mated formation.
The mat formation shear resistance parameter of system interlayer materials of combined type is to carry out the important evidence that the paving structure design and construction is checked and accepted.Usually the test method of measuring the interlaminar shear strength parameter at present is that converter technique is to the compressive stress direct shear test.It during test is the basis with the direct shear test; Through changing the normal direction compressive stress; Measure interlayer shear stress; And obtain one group of diffusing point of the interlayer shear stress about different normal direction compressive stress, and adopt straight line to return and obtain its shear resistance envelope and obtain relevant interlaminar shear strength parameter, be used for assay and design.Yet the direct shear test instrument is merely part R&D institution and has because load mode is complicated, is unfavorable for design application and delivery receiving acceptance.
Summary of the invention
In order to make combined type the obtaining of system interlaminar shear strength parameter of mating formation more simple and reliable, and can better instruct the design and construction operation.The object of the present invention is to provide a kind of combined type system interlaminar shear strength parametric measurement method of mating formation, be applied to pavement engineerings such as highway, bridge, urban road, airport.The present invention adopts the change inclination angle tiltedly to cut loading mode, measures the failing load value of differing tilt angles, and by formula is translated into corresponding shear breakage normal direction compressive stress and tangential shearing stress.Corresponding normal direction compressive stress of differing tilt angles and shear stress are listed in normal direction compressive stress ~ shear stress scatter diagram, adopt linear model to return and obtain shear resistance envelope equation.Obtain being used to estimate the intensive parameter of interlayer shear performance at last according to the shear resistance envelope: angle of internal friction, cohesive strength.
The compound system interlaminar shear strength parametric measurement method of mating formation that the present invention proposes, concrete steps are following:
(1) concrete block preparation
With reference to " design of common concrete proportioning rules " (JGJ/T 55-1996) preparation strength grade is the cement concrete test specimen of C30; Thickness is 50 ± 5mm; Length and the wide 100mm that is; Maintenance 21 days is removed surperficial laitance after accomplishing, and before experiment, needs at 110 ± 5 ℃ concrete block to be dried to constant weight;
(2) concrete block surface-coated water-proof bond material
The concrete block surface that obtains in step (1) applies water-proof bond material on request, requires the uniform and stable of various water-proof bond materials coatings, does not stay bubble; Handle and maintenance according to the different materials construction technology simultaneously, obtain the cement concrete test specimen;
(3) specimen molding
The concrete sample that step (2) is obtained; With the face that is coated with water-proof bond material is last form; Put into the cube mold of 100mm * 100mm * 100mm, adopt static pressure method at water-proof tack coat surface forming bituminous concrete, the demoulding is placed on maintenance 24h in the room temperature;
(4) test specimen test
The test specimen that step (3) is obtained needs under design temperature, to be incubated at least 5 hours before making an experiment; During test test specimen is positioned in the environment insulation can, when not adopting the constant temperature oven test environment to test, needs the assurance test specimen in 45s, to accomplish mensuration; The test specimen of good heat insulation is placed in the oblique scissor test anchor clamps of setting the inclination angle carries out the oblique scissor test of varied angle, the control inclination angle is 30 °-50 °, and anchor clamps are applied the load of 50mm/min, and record obtains in this process tiltedly scissor test load peak value;
(5) the interlaminar shear strength parameter is confirmed
Interlayer shear stress and interlayer normal direction compressive stress when calculating each oblique scissor test inclination angle load peak value; And it is listed on shear stress (τ)-normal direction compressive stress (σ) scatter diagram; Can obtain the once linear equation about interlayer shear stress and normal direction compressive stress: τ=σ tan φ+c through linear recurrence, wherein: φ is an angle of internal friction, and c is a cohesive strength.
Among the present invention, the inclination angle angle of said oblique scissor test is 30 °-50 °.With the inclination angle angle be 30 °, 40 ° and 50 ° with example, combined type is mated formation, and shearing inclination is a foundation of confirming oblique scissor test angle between system layer, in Pavement Design, the shearing inclination during the horizontal brake control power of consideration is approximate thinks 40 °.Therefore present great majority tiltedly scissor test all adopt 40 ° to make an experiment.In fact, under the situation of only considering vertical load, also need consider necessarily to shear the inclination angle when analyzing the actual loading situation of the interlayer of mating formation.According to calculating, it is as shown in table 1 with the normal direction angle with joint efforts between interlayer tangential stress and the normal stress to mat formation, and when only considering vertical load, the angular range of each each operating mode of bridge type is generally between 20 ° ~ 30 °.Therefore in flat slope section occasion, the occasion of the less generation horizontal force of vehicle tyre considers that it is rational adopting 30 ° of oblique scissor tests in inclination angle.In addition, in order to obtain better test findings, another is tiltedly cut the angle of inclination and should be 50 ° in test.
Make a concerted effort between table 1 interlayer tangential stress and the normal stress with the normal direction angle (°)
| Combined type paving structure type | Box girder bridge | Slab bridge | The T beam bridge | Morning-night | Airfield pavement |
| The angle value | 23.7 | 26.0 | 29.7 | 24.7 | 28.4 |
The loading speed of oblique scissor test according to the invention is 50mm/min.In shear test, the load loading speed also has certain influence to the shear resistance value.Paving loading frequency experience Nuo Motu with reference to mechanics empirical method (ME-PDG) proposes can calculate that the load action time that obtains under different rows vehicle speed and the pavement thickness is as shown in table 2.
The interlayer of mating formation when table 2 different-thickness and road speed loads action time (s)
System brea bed thickness is thin with respect to the plain asphalt pavement structure because combined type is mated formation, and can suppose that the layer of mating formation does not disperse the effect of traffic loading, from The results; The interlayer shear stress maximal value of mating formation appears at the wheelmark marginal position; And after the wheelmark outside, interlayer shear stress decays to zero rapidly, so near the effective length of load action certain some the time can be similar to, and to be reduced to wheelmark long; According to the calculating diagram of BZZ-100, get 21.3cm here.It is as shown in table 3 to calculate the shearing loading speed that is used for the interlayer shear test.From present strength test method, adopting 50mm/min is the conventional way of comparison, therefore measures for the combined type system interlaminar shear strength of mating formation that to adopt loading speed be 50mm/min here.
Table 3 interlayer shear test loading speed suggestion (mm/min)
Among the present invention, said oblique scissor test load peak value can calculate shear stress and the corresponding normal direction compressive stress thereof when the load peak value takes place as follows:
Shear stress:
The normal direction compressive stress:
(formula
)
Wherein:
---shear stress (MPa);
---normal direction compressive stress (MPa);
---failing load (KN);
---the angle of shear;
---shear surface area.
The object of the present invention is to provide a kind of mensuration combined type of the simplification system interlaminar shear strength parameter (angle of internal friction of mating formation; Cohesive strength) method; Compare to the compressive stress direct shear test with traditional political reform; It has been simplified to shear and has received force mode, becomes original pressure and cuts to separate and cut into pressure by force mode to receive force mode simultaneously, this test can be carried out on general pressing machine.This assay method has that test operation is simple, and test specimen receives force mode clear and definite, and test findings is accurately credible, and the evaluation index mechanical meaning clearly waits characteristics.
The present invention can be used for that the concrete bridge deck flexibility is mated formation, cement concrete pavement covering bituminous sheaths, underground express passway concrete guidance tape Laying Asphalt Surface Course, airfield pavement lid be by the fast measuring of the interlaminar shear strength parameter at cement concrete such as engineering and bituminous concrete interface.Adopt interlaminar shear strength parameter univocal that this method measures, be convenient to design and use and delivery receiving acceptance.The application of this method will be convenient to analyse in depth combined type mat formation system interface layer characteristic and rule, further improve cutting performance appraisement system between existing layer.Also the system interlayer materials is selected and design provides the analysis of experiments means for combined type is mated formation simultaneously.
Description of drawings
Fig. 1 is a concrete test block oven dry diagram among the embodiment 1.
Fig. 2 applies the concrete block diagram after SBS heat is melted modified bitumen for embodiment 1.
Fig. 3 is embodiment 1 a static pressure method shaping test piece diagram.
Fig. 4 is embodiment 1 a test specimen room temperature maintenance diagram.
Fig. 5 is an interlayer shear resistance envelope among the embodiment 1.
Embodiment
embodiment 1: enumerate the interlaminar shear strength parametric measurement method when adopting heat to melt the SBS modified bitumen as the water-proof binding layer material.
Material property detects:
1) combined type is mated formation between system layer and to be adopted the SBS modified bitumen as the interlayer bond material, and this pitch meets among " asphalt highway construction technique normalizing " (JTG F40-2004) regulation for modified bitumen (I-D) technical requirement.
2) the combined type system concrete surface of mating formation should design according to sub-layer concrete requirement in the concrete engineering; In embodiment, be the cement concrete test specimen of C30 with reference to " design of common concrete proportioning rules " (JGJ/T 55-1996) preparation strength grade.The material technology performance index all satisfy the relevant technologies requirement.
3) in the embodiment asphalt adopts No. 70 A level pitches as asphaltic binder, the regulation for the technical requirement of No. 70 A level pitch is satisfied among " asphalt highway construction technique normalizing " (JTG F40-2004) in technical requirement.Compound adopts the AC-20C grating, and the used ls that gathers materials has respectively: 15～25mm rubble, 10～15mm rubble, 5～10mm rubble, 0～5mm aggregate chips.Used gather materials meet " asphalt highway construction technique normalizing " (JTG F40-2004) to one-level road asphalt compound with the requirement of gathering materials.Breeze meets " asphalt highway construction technique normalizing " (JTG F40-2004) to the requirement of one-level road asphalt compound with packing quality.
The preparation of
concrete block.
With reference to " design of common concrete proportioning rules " (JGJ/T 55-1996) preparation strength grade is the cement concrete test specimen of C30; Thickness is 50 ± 5mm; Length and the wide 100mm that is; Maintenance 21 days is removed surperficial laitance after accomplishing, and before experiment, needs at 110 ± 5 ℃ concrete block to be dried to constant weight.As shown in Figure 1.
concrete block surface-coated water-proof bond material.
Heat is melted the SBS modified bitumen be heated to 180 ℃, make it to become flow state, according to 1.0kg/m
2The interface of consumption between evenly being applied between concrete block and brea bed on, makes heat melt the SBS modified bitumen and form thickness and be the film of 1mm, and bubble is not stayed on the assurance surface at concrete surface.After applying completion, placed it in the room temperature maintenance 24 hours.Coating SBS heat as shown in Figure 2 is melted the concrete block behind the modified bitumen.
specimen molding.
The cube mold of 100mm * 100mm * 100mm is heated to 100 ℃ and be incubated 5 hours; Before specimen molding, take out; With step 2) in concrete block put it into; Simultaneously the hot asphalt mixture that mixes is poured in the mould, adopted static pressure method, guarantee that the compactness of its asphalt reaches the requirement of design compactness at water-proof tack coat surface forming bituminous concrete.The demoulding is placed on maintenance 24h in the room temperature; Wherein: Fig. 3 is the static pressure method shaping test piece, and Fig. 4 is the maintenance of test specimen room temperature.
The test of
test specimen.
Embodiment adopts 15 ℃ as test temperature, and test specimen needs 15 ℃ to be incubated at least 5 hours down before making an experiment.During test test specimen is positioned in the environment insulation can, when not adopting the constant temperature oven test environment to test, needs the assurance test specimen in 45s, to accomplish mensuration.The test specimen of good heat insulation is placed in the oblique scissor test anchor clamps of setting the inclination angle.Anchor clamps are applied the load of 50mm/min, and record obtains load peak value in this process.It is as shown in the table that the difference that obtains is tiltedly cut the test findings at inclination angle.
Table 4 varied angle shear test result
| The test specimen numbering | The test inclination angle (°) | Load peak value (KN) | Normal direction compressive stress (MPa) | Tangential shearing stress (MPa) |
| 1 | 30 | 21.3 | 1.8 | 1.1 |
| 2 | 30 | 19.7 | 1.7 | 1.0 |
| 3 | 30 | 20.5 | 1.8 | 1.0 |
| 4 | 40 | 9.26 | 0.7 | 0.6 |
| 5 | 40 | 10.24 | 0.8 | 0.7 |
| 6 | 40 | 11.49 | 0.9 | 0.7 |
| 7 | 50 | 9.12 | 0.6 | 0.7 |
| 8 | 50 | 8.87 | 0.6 | 0.7 |
| 9 | 50 | 9.2 | 0.6 | 0.7 |
) the interlaminar shear strength parameter confirms.
Interlayer shear stress and interlayer normal direction compressive stress when calculating each oblique scissor test inclination angle load peak value.And it is listed on shear stress (τ)-normal direction compressive stress (σ) scatter diagram.Can obtain the once linear equation about interlayer shear stress and normal direction compressive stress: τ=σ tan φ+c through linear recurrence.And obtain internalfrictionangle, cohesive strength c.
Normal direction compressive stress that obtains according to regression result and the relational expression between the shear stress are:
τ?=?0.309σ?+?0.469
Can obtain shear resistance parameter: internalfrictionangle=arctan0.309=17.1 ° at last, cohesive strength c=0.469MPa.
Claims (1)
1. compound system interlaminar shear strength parametric measurement method of mating formation is characterized in that concrete steps are following:
(1) concrete block preparation
With reference to " design of common concrete proportioning rules " (JGJ/T 55-1996) preparation strength grade is the cement concrete test specimen of C30; Thickness is 50 ± 5mm; Length and the wide 100mm that is; Maintenance 21 days is removed surperficial laitance after accomplishing, and before experiment, needs at 110 ± 5 ℃ concrete block to be dried to constant weight;
(2) concrete block surface-coated water-proof bond material
The concrete block surface that obtains in step (1) applies water-proof bond material on request, requires the uniform and stable of various water-proof bond materials coatings, does not stay bubble; Handle and maintenance according to the different materials construction technology simultaneously, obtain the cement concrete test specimen;
(3) specimen molding
The cement concrete test specimen that step (2) is obtained; With the face that is coated with water-proof bond material is last form; Put into the cube mold of 100mm * 100mm * 100mm, adopt static pressure method at water-proof tack coat surface forming bituminous concrete, the demoulding is placed on maintenance 24h in the room temperature;
(4) test specimen test
The test specimen that step (3) is obtained needs under design temperature, to be incubated at least 5 hours before making an experiment; During test test specimen is positioned in the environment insulation can, when not adopting the constant temperature oven test environment to test, needs the assurance test specimen in 45s, to accomplish mensuration; The test specimen of good heat insulation is placed in the oblique scissor test anchor clamps of setting the inclination angle carries out the oblique scissor test of varied angle, the control inclination angle is 30 °-50 °, and anchor clamps are applied the load of 50mm/min, and record obtains in this process tiltedly scissor test load peak value;
(5) the interlaminar shear strength parameter is confirmed
Interlayer shear stress and interlayer normal direction compressive stress when calculating each oblique scissor test inclination angle load peak value; And it is listed on shear stress (τ)-normal direction compressive stress (σ) scatter diagram; Can obtain the once linear equation about interlayer shear stress and normal direction compressive stress: τ=σ tan φ+c through linear recurrence, wherein: φ is an angle of internal friction, and c is a cohesive strength.
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| CN104062190A (en) * | 2014-04-21 | 2014-09-24 | 青海省公路科研勘测设计院 | Shearing strength detection method for new and old pavement connecting layer material |
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Application publication date: 20120620 |