CN107607471B - Asphalt pavement water-containing oilstone interface consolidation strength test method - Google Patents
Asphalt pavement water-containing oilstone interface consolidation strength test method Download PDFInfo
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- CN107607471B CN107607471B CN201711007668.9A CN201711007668A CN107607471B CN 107607471 B CN107607471 B CN 107607471B CN 201711007668 A CN201711007668 A CN 201711007668A CN 107607471 B CN107607471 B CN 107607471B
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Abstract
The invention discloses a method for testing the consolidation strength of a water-bearing oilstone interface of an asphalt pavement, which comprises five steps of preparation before testing, preliminary preparation of a test piece, preparation of test pieces with different soaking times, measurement of the shear failure strength of the test piece and simulation calculation of the water-bearing oilstone interface water content of a matched test piece. The specific test process comprises the steps of carrying out indoor shear test on test pieces with different soaking time by using a shear tester, and carrying out numerical simulation through a mass dispersion module of software ABAQUS to obtain a fitting curve of the soaking time and the interface water content. And finally, obtaining the fitting relation between the moisture content of the oilstone interface and the shear strength through data processing. Compared with the prior art, the invention has the beneficial effects that: the relation between the moisture content of the oilstone interface and the overall shear strength of the contact surface is determined by a research method combining numerical simulation and indoor test, the past empirical method is effectively improved, and the test data are ensured to be more accurate and scientific.
Description
Technical Field
The invention belongs to the technical field of traffic civil engineering, and particularly relates to a method for testing the consolidation strength of a water-containing oilstone interface of an asphalt pavement.
Background
Along with the wide application of asphalt mixture pavement structures in the field of high-grade highways, the problems of durability and early damage of the pavement structures are increasingly prominent. The current investigation result of pavement diseases shows that the main disease types occurring in low-temperature and severe cold areas are low-temperature cracking and then water damage, the main disease types occurring in high-temperature and hot areas are high-temperature deformation and then water damage, and the water damage is the main type of pavement damage no matter how different the areas and weather conditions are, and is usually accompanied by the common occurrence, common development and continuous deterioration of other disease types in the whole damage stage.
The water damage specifically refers to that after the asphalt mixture is compacted after being paved, water in the form of rainwater and the like enters the road surface through gaps of the mixture in the use process of the mixture, under the action of repeated load, the water originally existing statically is impacted by driving pressure to generate water impact, so that the mixture is continuously washed away, after multiple cycles, the viscosity of asphalt cement is continuously reduced, the adhesion with aggregate is weakened, and according to the theory formed by the strength of the asphalt mixture, the two parts forming the strength of the mixture are reduced, so that the overall structural strength of the road surface is reduced, the mixture aggregate and asphalt are separated, and then the mixture can generate the forms of diseases such as slurry turning, mud pumping, loosening and the like due to the fact that the separation phenomenon is more and more severe. The current research mainly considers that the reduction of the bond strength of the cement and the adhesion strength of the oilstone interface is the main reason for the generation of water damage, wherein the bond strength of the cement and the adhesion strength between the cement and the aggregate are collectively called as oilstone interface consolidation strength. Diffusion of moisture from the asphalt or cement film to the oilstone interface can result in peeling of the asphalt film and, moreover, an increase in the moisture content of the cement can seriously affect the rheological and engineering properties of the cement. At present, the mechanism of water damage generation has not been well explained, and empirical methods are currently a common and effective method for studying these phenomena.
The self-adhesive property of asphalt and mucilage materials and the adhesion property of the asphalt and the mucilage materials to stone inevitably have important influence on the mechanical property of the mixture, the diffusion of water in the mucilage firstly softens the asphalt to cause the cohesive property of the asphalt and the mucilage to be poor, and if the water content of an oil-stone interface is larger, the adhesive strength of the mucilage-aggregate is adversely affected. At present, certain achievements have been accumulated in the related research on the consolidation strength of the oilstone interface, wherein the quantitative test technology for the interface consolidation is the basis for researching the consolidation effect of the interface and determining the improvement scheme, while the related research on the water interface is less, and especially the relationship between quantitative interface water and the consolidation strength of the oilstone interface has not found a mature test method and test result. In order to research the influence of the water-containing interface of the asphalt mixture on the consolidation strength of the oil-stone interface, it is necessary to develop a test method capable of testing the consolidation strength of the oil-stone interface on the water-containing interface, and to develop different asphalt pavement water damage modification materials under the test method.
Disclosure of Invention
The invention aims to provide a test method for testing the consolidation strength of a hydrous oilstone interface of an asphalt pavement, aiming at the problems in the existing experimental method for the consolidation strength of the oilstone interface.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: a method for testing the consolidation performance of a water-containing oilstone interface of an asphalt pavement comprises the following specific steps:
s1, preparation before test: placing a stretching piece and a base in an oven for preheating, wherein the stretching piece and the base are both of cuboid structures, and placing asphalt in the oven for heating until the asphalt is in a flowing state;
s2, preliminary preparation of test pieces: coating asphalt on the surface of the base to form a rectangular consolidation layer, bonding a tensile piece on the consolidation layer, connecting the tensile piece and the base through the consolidation layer to form a test piece, and measuring and calculating the consolidation area S of the consolidation layert；
S3, preparation of test pieces with different soaking times: placing the test piece prepared in the S2 and a matched test piece in accessory equipment with preset temperature, wherein the matched test piece comprises a base, an asphalt bonding layer and a tensile piece, the base of the test piece and the base of the matched test piece are immersed in distilled water of the accessory equipment, the immersion height of the base is smaller than the overall height of the base, the immersion time of the base is changed, and test piece samples with different immersion times and matched test piece samples with different immersion times are prepared;
s4, determination of the shear failure strength of the test piece: immediately placing the test piece samples with different soaking times prepared in S3 at preset temperature to asphalt pavement water-containing oilstone interface consolidation strength shearCarrying out a shear test in a shear tester, recording the shear failure load F of each test piece, and obtaining the consolidation area S according to the S2tCalculating to obtain the shear failure strength R of each test piecet；
S5, simulation calculation of the water content of the hydro-oilstone interface of the matched test piece: adopting a mass dispersion module of ABAQUS, and setting a water diffusion coefficient D in the mass dispersion module according to the material of the matched test piece prepared in S3rockThe water concentration of all the surfaces of the matched test piece immersed in the water is regulated to be 1, the relation between the immersion time of the matched test piece and the water content of the water-oil-stone interface of the matched test piece is simulated and calculated, and the shear failure strength R of the test piece with different immersion times is obtained by combining S4tObtaining the water content of the water-oil-stone interface of the test piece and the shear failure strength R of the test piecetThe relationship between them.
Further, the tensile member and the base in the S1 are placed in an oven at 80-120 ℃ for preheating for 5-20min, the size of each of the tensile member and the base is 40 × 10mm cuboid stone, the asphalt in the S1 is one of traditional asphalt, modified asphalt or asphalt cement, and the matched test piece in the S3 is completely the same as the test piece prepared in the S2.
Further, accessory equipment in S3 is small-size constant temperature water bath, the lower part of small-size constant temperature water bath ' S inside wall is provided with temperature sensor, be provided with the control dial plate on small-size constant temperature water bath ' S the lateral wall, the lower part of small-size constant temperature water bath ' S lateral wall is provided with the temperature-controlled element that extends to in the small-size constant temperature water bath, temperature-controlled element level sets up in small-size constant temperature water bath, temperature-controlled element is U type immersion electrothermal tube, temperature sensor and temperature-controlled element all are connected with the external control dial plate through data transmission line.
Further, the shear tester for the consolidation strength of the bituminous pavement water-containing oilstone interface in the S4 comprises a base and a temperature control test box;
the base comprises a first plate and a cuboid cavity, the first plate is directly contacted with the ground, the cuboid cavity is perpendicular to the first plate and is integrally connected with the first plate, a second plate parallel to the first plate is arranged in the cuboid cavity, the cuboid cavity is divided into an upper part and a lower part by the second plate, a compressor is arranged at the lower part of the cuboid cavity, a motor is arranged at the upper part of the cuboid cavity, a temperature control test box is integrally arranged at the top of the base, an exhaust pipe of the compressor is connected with an air inlet of the temperature control test box, the compressor is used for controlling the temperature in the temperature control test box, and the motor is connected with an external computer through a data transmission line;
the temperature control test box is characterized in that an upper cross beam is fixedly arranged at the top end inside the temperature control test box, a lower jaw is fixedly arranged at the center position of the bottom end inside the temperature control test box, two lead screws are movably connected to two ends of the upper cross beam and perpendicular to the bottom end of the temperature control test box, two lower cross beams are movably connected to the lead screws, the lower cross beams are parallel to the upper cross beams, the central axes of the lower cross beams in the vertical direction coincide with the central axes of the temperature control test box in the vertical direction, the lower cross beams are connected with the upper jaw through hinged chain rods, the bottoms of the lead screws are respectively connected with the output end of a motor through couplers, shear force sensors are arranged on the lower cross beams and are connected with an external computer through data transmission lines.
Furthermore, the central axis of the upper jaw in the vertical direction is staggered with the central axis of the lower jaw in the vertical direction, the upper jaw is fixed on the lower cross beam through a hinged chain rod, the motor drives the screw rod to rotate, and the screw rod drives the lower cross beam to move upwards or downwards along the screw rod.
Further, when the test temperature is required to be higher than 0 ℃, firstly, controlling the water and the temperature control test box in the small constant-temperature water bath box at the required temperature, then putting the test piece into the small constant-temperature water bath box for culture, quickly putting the test piece into the temperature control test box after the culture is finished, and immediately carrying out a shear test after the test piece is stabilized for 3-8 min;
when the test temperature is less than 0 ℃, firstly controlling the water in a small thermostatic water bath to be 4-6 ℃, controlling the temperature of a temperature control test box to be the temperature required by the test, then putting the test piece into the small thermostatic water bath for culture, taking out the test piece, wrapping the test piece with a preservative film in a winding way, immediately putting the test piece into the temperature control test box, controlling the temperature to enable the temperature of the test piece to reach the temperature of the test, finally removing the preservative film, and carrying out a shear test after stabilizing for 3-8 min.
Further, the consolidation area S in S2tSatisfies StA × b × 3/4, wherein a is the length of the tensile member or base, b is the width of the tensile member or base, and a and b are both 40mm, shear failure load F and consolidation area S in S4tAnd shear failure strength RtSatisfy Rt×St＝F。
Further, the simulation calculation of the interface moisture content in S5 satisfies the following condition:
wherein
Indicates the interfacial water content, CmAs the concentration of the water content, the concentration of the water,
is the concentration limit value of the test piece moisture bearing.
Compared with the prior art, the invention has the beneficial effects that: by means of a self-designed research method combining numerical simulation and indoor tests, the relation between the water content of the water-oil-stone interface and the shear strength of the water-oil-stone interface of the test piece can be determined. Immersing the test piece into water at a certain temperature to ensure that the water-oil-stone interface reaches a certain water content; the influence of the soaking time on the shear strength of the water-petroleum interface of the test piece is quantitatively researched by changing the soaking time and immediately testing the shear strength after the specified soaking time is reached. Water permeates to the water-oil-stone interface from the bottom of the base to ensure the generation of consolidation failure, and the moisture diffusion coefficient D in the rock material is set through the mass diffusion module of ABAQUSrockCan be well testedThe change rule of the immersion time of the test piece and the water-oil-stone interface water content of the test piece, and the method combining numerical simulation and indoor test effectively improves the past empirical method and ensures that test data are more accurate and scientific.
Drawings
FIG. 1 is a flow chart of the method for testing the consolidation strength of the hydrous oilstone interface of the asphalt pavement;
FIG. 2 is a schematic structural diagram of a shear tester for consolidation strength of a hydrous oilstone interface of an asphalt pavement according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the structure of the accessory device;
FIG. 4 is a graph of overall shear strength versus time to submersion in an embodiment of the present invention
FIG. 5 is a graph showing the change in water content of a test piece according to an embodiment of the present invention after being soaked in water for 4 hours;
FIG. 6 is a fitting graph of the relationship between the surface moisture content of the test piece and the change of the immersion time according to the embodiment of the present invention;
FIG. 7 is a graph showing the relationship between the total shear strength and the interface water content of a test piece at 10 ℃ when the binder is matrix asphalt according to an embodiment of the present invention;
description of reference numerals: 1. an upper cross beam; 2. a lower cross beam; 3. a hinged chain bar; 4. an upper jaw; 5. a screw rod; 6. a lower jaw; 7. a motor; 8. a base; 8-1, a first plate; 8-2 second plate; 8-3, a cuboid cavity; 9. a data transmission line; 10. a temperature control test chamber; 11. a compressor; 12. a temperature sensor; 13. a temperature control element; 14. a small constant temperature water bath tank; 15. and controlling the dial.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the technical scheme in the embodiment of the invention is clearly and completely described below with reference to the attached drawings in the embodiment of the invention.
As shown in figure 1, the specific implementation mode of the invention is realized by adopting the following technical scheme, and the method for testing the consolidation performance of the water-containing oilstone interface of the asphalt pavement comprises the following specific steps:
s1, preparation before test: placing a tensile piece and a base in an oven to preheat for 15min at 100 ℃, wherein the tensile piece and the base are both of cuboid structures, and placing asphalt in the oven at 135 ℃ to heat until the asphalt is in a flowing state;
s2, preliminary preparation of test pieces: coating asphalt on the surface of the base to form a rectangular consolidation layer, bonding a tensile piece on the consolidation layer, connecting the tensile piece and the base through the consolidation layer to form a test piece, and measuring and calculating the consolidation area S of the consolidation layert；
S3, preparation of test pieces with different soaking times: placing the test piece prepared in the S2 and a matched test piece in accessory equipment with preset temperature, wherein the matched test piece comprises a base, an asphalt bonding layer and a tensile piece, the base of the test piece and the base of the matched test piece are immersed in distilled water of the accessory equipment, the immersion height of the base is smaller than the overall height of the base, the immersion time of the base is changed, and test piece samples with different immersion times and matched test piece samples with different immersion times are prepared;
s4, determination of the shear failure strength of the test piece: immediately placing the test piece samples with different soaking times prepared in the S3 into a temperature control test box of a shear tester for the consolidation strength of the water-bearing oilstone interface of the asphalt pavement at a preset temperature to carry out a shear test, recording the shear failure load F of each test piece, and obtaining the consolidation area S according to the S2tCalculating to obtain the shear failure strength R of each test piecet；
S5, simulation calculation of the water content of the hydro-oilstone interface of the matched test piece: adopting a mass dispersion module of ABAQUS, and setting a water diffusion coefficient D in the mass dispersion module according to the material of the matched test piece prepared in S3rockThe water concentration of all the surfaces of the matched test piece immersed in the water is regulated to be 1, the relation between the immersion time of the matched test piece and the water content of the water-oil-stone interface of the matched test piece is simulated and calculated, and the shear failure strength R of the test piece with different immersion times is obtained by combining S4tObtaining the water content of the water-oil-stone interface of the test piece and the shear failure strength R of the test piecetThe relationship between them.
In a preferred embodiment of the present invention, the tensile member and the base in S1 are placed in an oven at 80-120 ℃ for preheating for 5-20min, the dimensions of the tensile member and the base are both 40 × 10mm rectangular blocks, the asphalt in S1 is one of conventional asphalt, modified asphalt or asphalt cement, and the mating test piece in S3 is identical to the test piece prepared in S2.
As a preferred embodiment of the present invention, the accessory device in S3 is a small-sized constant temperature water bath box 14, the temperature sensor 12 is disposed at the lower portion of the inner side wall of the small-sized constant temperature water bath box 14, the control dial 15 is disposed on the outer side wall of the small-sized constant temperature water bath box 14, the temperature control element 13 extending into the small-sized constant temperature water bath box 14 is disposed at the lower portion of the outer side wall of the small-sized constant temperature water bath box 14, the temperature control element 13 is horizontally disposed in the small-sized constant temperature water bath box 14, the temperature control element 13 is a U-shaped immersion electric heating tube, the temperature sensor 12 and the temperature control element 13 are both connected with an external control dial through a data transmission line, the temperature control of the small-sized constant temperature water bath box 14 can be realized through the. The temperature control element 13 effects heating of the water in the small thermostatic water bath 14. When the auxiliary equipment is used, a user firstly sets the required temperature through the control dial 15, then the auxiliary equipment is electrified, the water in the small-sized constant-temperature water bath box 14 is heated through the temperature control element 13, meanwhile, the temperature sensor 12 transmits the temperature of the water to the control dial 15 in real time, and when the temperature sensor 12 detects that the temperature of the water reaches the temperature initially set by the control dial 15, the control dial 15 controls the temperature control element 13 to stop heating the water. When the temperature sensor 12 detects that the temperature of the water is lower than the temperature initially set by the control dial 15, the control dial 15 will control the temperature control element 13 to continue heating the water.
As another preferred scheme of the invention, the asphalt pavement hydrous oilstone interface consolidation strength shear tester in S4 comprises a base 8 and a temperature control test box 10;
the base 8 comprises a first plate 8-1 and a cuboid cavity 8-3, the first plate 8-1 is directly contacted with the ground, the cuboid cavity 8-3 and the first plate 8-1 are mutually vertical and integrally connected, a second plate 8-2 parallel to the first plate 8-1 is arranged in the cuboid cavity 8-3, the cuboid cavity 8-3 is divided into two parts by the second plate 8-2, the lower two parts are that the lower part of the cuboid cavity 8-3 is provided with a compressor 11, the upper part of the cuboid cavity 8-3 is provided with a motor 7, the top of the base 8 is integrally provided with a temperature control test box 10, an exhaust pipe of the compressor 11 is connected with an air inlet of the temperature control test box 10, the compressor 11 is used for controlling the temperature in the temperature control test box 10, and the motor 7 is connected with an external computer through a data transmission line 9;
the fixed entablature 1 that is provided with in inside top of accuse temperature proof box 10, the central point of the inside bottom of accuse temperature proof box 10 puts the fixed lower jaw 6 that is provided with, each swing joint in both ends of entablature 1 has a lead screw 5, lead screw 5 is perpendicular with the bottom of accuse temperature proof box 10, lead screw 5 and the inside bottom swing joint of accuse temperature proof box 10, swing joint has a bottom end rail 2 on two lead screws 5, bottom end rail 2 is parallel with entablature 1 and the axis of the vertical direction of bottom end rail 2 coincides with the axis of the vertical direction of accuse temperature proof box 10, be connected with upper jaw 4 through articulated chain pole 3 on bottom end rail 2, the bottom of two lead screws 5 is connected with the output of motor 7 through the shaft coupling respectively, be provided with the shearing force sensor on the bottom end rail 2, the shearing force sensor passes through data transmission line.
As a preferred scheme of the invention, the central axis of the upper jaw 4 in the vertical direction is staggered with the central axis of the lower jaw 6 in the vertical direction, and the upper jaw 4 is fixed on the lower beam 2 through the hinged chain rod 3, so that the stability of the stress direction of a test piece when the test piece is pulled can be ensured, the influence of bending moment on an experimental result can be reduced, the experimental sample is ensured to be only subjected to the shearing action, the motor 7 drives the screw rod 5 to rotate, and the screw rod 5 drives the lower beam 2 to move upwards or downwards along the screw rod 5.
As another preferable scheme of the invention, when the test temperature is required to be higher than 0 ℃, the water in the small-sized constant-temperature water bath box 14 and the temperature control test box 10 are controlled at the required temperature, then the test piece is put into the small-sized constant-temperature water bath box 14 for culture, after the culture is finished, the test piece is quickly put into the temperature control test box 10, and the shear test is carried out immediately after the stability is carried out for 3-8 min;
when the test temperature is less than 0 ℃, firstly controlling the water in the small-sized constant-temperature water bath box 14 at 4-6 ℃, controlling the temperature of the temperature control test box 10 at the temperature required by the test, then putting the test piece into the small-sized constant-temperature water bath box 14 for culture, taking out the test piece, winding and wrapping the test piece by using a preservative film after the culture is finished, immediately putting the test piece into the temperature control test box 10, controlling the temperature to enable the temperature of the test piece to reach the test temperature, finally removing the preservative film, and carrying out a shear test after stabilizing for 3-8 min.
As another preferred embodiment of the present invention, the consolidation area S in S2tSatisfies StA × b × 3/4, wherein a is the length of the tensile member or base, b is the width of the tensile member or base, and a and b are both 40mm, shear failure load F and consolidation area S in S4tAnd shear failure strength RtSatisfy Rt×St＝F。
As another preferable aspect of the present invention, the simulation calculation of the interface water content in S5 satisfies the following condition:
wherein
Indicates the interfacial water content, CmAs the concentration of the water content, the concentration of the water,
is the concentration limit value of the test piece moisture bearing.
According to the invention, the mathematical relation between the shear strength of the water-containing oilstone interface and the soaking time is obtained through the test, the relation between the water content of the oilstone interface and the soaking time is obtained through numerical simulation, and finally the fitting relation between the overall shear strength of the water-containing oilstone interface and the water content is determined.
In the present invention, for the simulation calculation of the interface moisture content of S5, the mass dispersion module of ABAQUS is used. Abaqus/Standard provides transient and steady state models for calculating diffusion of one material into another, for example, the process of pervaporation of water molecules into a rock specimen is calculated using an extended form of fick's law to calculate diffusion of a non-uniformly soluble species in a base material.
1) Equation of control
The calculation of the problem of diffusion by osmosis obeys the law of conservation of mass of the diffusion phase:
where V is an arbitrary volume, S is the surface of V, n is the normal phase with the S face outward, and J is the diffusion flux of the diffusion phase.
2) Constitutive relation
Diffusion is assumed to be driven by chemical potential gradients, giving a basic constitutive relation
Wherein D (c, θ, f) is the diffusion coefficient; s (θ, f) is solubility; k is a radical ofs(c, theta and f) are special effect factors of the Soire, and influence diffusion related to temperature gradient; theta is the temperature; thetazIs absolute zero degrees; k is a radical ofpAnd (c, theta, f) is a compressive stress factor and influences diffusion in relation to an equivalent compressive stress gradient.
Example one
S1, preparation before test: placing a stretching piece and a base in an oven for preheating, wherein the stretching piece and the base are both of cuboid structures, the temperature of the oven is set to be 100 ℃, and the preheating is carried out for 15 min; heating the matrix asphalt in an oven at about 135 ℃ until the asphalt is in a flowing state, wherein the matrix asphalt is represented by CA;
s2, preliminary preparation of test pieces: coating asphalt on the surface of the base to form a rectangular consolidation layer, bonding a tensile piece on the consolidation layer, connecting the tensile piece and the base through the consolidation layer to form a test piece, and measuring and calculating the consolidation area S of the consolidation layert(ii) a The stretching piece and the base of the example both adopt 40 × 10mm granite blocks, firstly, the matrix asphalt CA is coated on the surface of the base with the side length of 40mm × 40mm to form a rectangular bonding layer, one side of the bonding layer is completely coincided with one side of the surface of the base, and the coating area of the bonding layer occupies the base3/4 of surface area; then, scraping the bonding layer by using a preheated cutting edge; and finally, attaching the surface of the tensile piece with the side length of 40mm x 40mm to the bonding layer, completely covering the bonding layer by the tensile piece, enabling the bonding layer to occupy 3/4 of the surface area of the tensile piece, connecting the tensile piece and the base through the bonding layer to form a test piece, and measuring and calculating the bonding area S of the bonding layertA x b x 3/4 where a is the length of the elongate member or base, b is the width of the elongate member or base, and a and b are each 40mm, St＝a×b×3/4＝40×40×3/4＝1200mm2；
S3, preparation of test pieces with different soaking times: placing the test piece and the matched test piece prepared in the S2 in a small-sized constant-temperature water bath box 14 with the set temperature of 10 ℃, wherein the matched test piece comprises a tensile piece, a base and a bonding layer, the matched test piece is completely the same as the test piece prepared in the S2, the base in the test piece and the base in the matched test piece are horizontally immersed in distilled water of the small-sized constant-temperature water bath box 14, the immersion height is 1/2 of the thickness of the base, and the immersion time is 0h, 4h, 24h, 48h, 96h and 144h respectively;
s4, determination of the shear failure strength of the test piece: immediately placing the test piece samples with different soaking times prepared in S3 into a temperature control test box 10 with the temperature of 10 ℃, immediately testing after 5min of stability, wherein a tensile piece in the test piece is clamped on an upper jaw 4, a base in the test piece is clamped on a lower jaw 6, the rotating speed of a motor 7 is set through a computer to ensure that the moving speed of a lower cross beam 2 is 1mm/min, testing the test piece samples prepared in S3 and obtaining the shear failure load F of each test piece, and obtaining the consolidation area S according to S2tCalculating to obtain the shear failure strength R of each test piecetThe calculation results are shown in table 1 and fig. 4;
s5, simulation calculation of the water content of the hydro-oilstone interface of the matched test piece: adopting a mass dispersion module of ABAQUS, and setting a water diffusion coefficient D in the mass dispersion module according to the material of the matched test piece prepared in S3rockThe water concentration of all the surfaces of the matched test piece immersed in the water is regulated to be 1, the relation between the immersion time of the matched test piece and the water content of the water-oil-stone interface of the matched test piece is simulated and calculated, and different values are obtained by combining S4Shear failure strength R of test piece in soaking timetObtaining the water content of the water-oil-stone interface of the test piece and the shear failure strength R of the test piecetThe relationship between; in this example, the diffusion coefficient Drock is set to 0.6mm2H and according to the following calculation formula:
Example two
S1, preparation before test: placing a stretching piece and a base in an oven for preheating, wherein the stretching piece and the base are both of cuboid structures, the temperature of the oven is set to be 100 ℃, and the preheating is carried out for 15 min; heating the silane white carbon black modified asphalt in an oven at about 135 ℃ until the asphalt is in a flowing state, wherein the silane white carbon black modified asphalt is represented by SSA;
s2, preliminary preparation of test pieces: coating asphalt on the surface of the base to form a rectangular consolidation layer, bonding a tensile piece on the consolidation layer, connecting the tensile piece and the base through the consolidation layer to form a test piece, and measuring and calculating the consolidation area S of the consolidation layert(ii) a The stretching piece and the base of the embodiment both adopt 40 × 10mm granite blocks, firstly, the silane white carbon black modified asphalt SSA is coated on the surface of the base with the side length of 40mm × 40mm to form a rectangular bonding layer, one side of the bonding layer is completely coincided with one side of the surface of the base, and in addition, one side of the bonding layer is completely coincided with one side of the surface of the base3/4 the coating area of the bonding layer occupies the surface area of the base; then, scraping the bonding layer by using a preheated cutting edge; and finally, attaching the surface of the tensile piece with the side length of 40mm x 40mm to the bonding layer, completely covering the bonding layer by the tensile piece, enabling the bonding layer to occupy 3/4 of the surface area of the tensile piece, connecting the tensile piece and the base through the bonding layer to form a test piece, and measuring and calculating the bonding area S of the bonding layertA x b x 3/4 where a is the length of the elongate member or base, b is the width of the elongate member or base, and a and b are each 40mm, St＝a×b×3/4＝40×40×3/4＝1200mm2；
S3, preparation of test pieces with different soaking times: placing the test piece and the matched test piece prepared in the S2 in distilled water of a small-sized constant-temperature water bath box 14 with the set temperature of 10 ℃, wherein the matched test piece comprises a tensile piece, a base and a bonding layer, the matched test piece is completely the same as the test piece prepared in the S2, the base in the test piece and the base in the matched test piece are horizontally immersed in the distilled water of the small-sized constant-temperature water bath box 14, the immersion height is 1/2 of the thickness of the base, and the immersion time is 0h, 4h, 24h, 48h, 96h and 144h respectively;
s4, determination of the shear failure strength of the test piece: immediately placing the test piece samples with different soaking times prepared in S3 into a temperature control test box 10 with the temperature of 10 ℃, immediately testing after 5min of stability, wherein a tensile piece in the test piece is clamped on an upper jaw 4, a base in the test piece is clamped on a lower jaw 6, the rotating speed of a motor 7 is set through a computer to ensure that the moving speed of a lower cross beam 2 is 1mm/min, testing the test piece samples prepared in S3 and obtaining the shear failure load F of each test piece, and obtaining the consolidation area S according to S2tCalculating to obtain the shear failure strength R of each test piecetThe calculation results are shown in table 1 and fig. 4;
s5, the interface water content and the immersion time are the same as those of the first embodiment; this is because the stretching member and the base used in the second embodiment are the same as those in the first embodiment, and are 40 × 10mm granite blocks, water diffuses from the base to the oilstone interface during curing, and the material through which the water passes is the base during diffusion, so the relationship between the interface water content and the soaking time in the second embodiment is the same as that in the first embodiment, i.e., the relationship between the soaking time and the interface water content is only related to the base and is not related to the material filled between the base and the stretching member;
TABLE 1 statistical table of overall shear strength of base asphalt and modified asphalt under different soaking times
Note that: the immersion temperature and the test temperature of the temperature control test box 10 are both 10 DEG C
As shown in fig. 4 and table 1, it is found that the shear strength of the consolidation interface is greatly reduced by soaking both the base asphalt and the silane white carbon black-modified asphalt in water for a short time, and that the interface moisture content is saturated after 48 hours, and the interface strength is in a steady reduction stage.
Fitting the relationship between the soaking time and the total shear strength to obtain a fitted curve equation of the total shear strength and the soaking time of the matrix asphalt, wherein the fitted curve equation is that y is 2 multiplied by 10-5x2-0.004x +0.445, R2 ═ 0.916; the fitting curve equation of the total shear strength and the soaking time of the silane white carbon black modified asphalt is that y is 3 multiplied by 10-5x2-0.007x+0.638，R2＝0.895。
Through calculation, the relation between the average water content of the oilstone interface consolidation part of the test piece and the soaking time is obtained through simulation and is shown in figure 6, and the fitting curve is phi 1-e0.0093-0.0188tWhere t is the soaking time, the sum of squares of the residuals SSe＝0.0045，R2＝0.9943。
And combining The test result and The numerical calculation result to obtain The relationship between The total shear strength and The interface water content phi, wherein The total shear strength is abbreviated as ToSS (total shear stress) for convenience of expression in a formula.
The matrix asphalt overall shear strength and interface water content curve at 10 ℃ is shown in FIG. 7, and the regression formula is as follows:
residual sum of squares SSeIs 0.0001, determines the coefficient R2Is 0.99. The obvious fitting result is better, and the change rule is more stable.
The regression formula of the silane white carbon black asphalt overall shear strength and the interface water content under the condition of 10 ℃ is as follows:
residual sum of squares SSeIs 0.0001, determines the coefficient R2Is 0.99. And the same obvious fitting result is better, and the change rule is more stable. Further, the water damage resistance of the silane white carbon black modified asphalt material is better than that of the matrix asphalt.
In conclusion, the relation between the moisture content of the oilstone interface and the overall shear strength of the contact surface can be determined by a self-designed numerical simulation and indoor test combined research method. And (3) immersing the test piece into water at a certain temperature to enable the oilstone interface to reach a certain water content, and immediately testing the shear strength after reaching the specified immersion time to quantitatively research the influence of the interface water on the shear strength of the oilstone interface. The penetration of water from the bottom of the base to the oilstone interface can ensure the occurrence of consolidation failure, and the setting of the moisture diffusion coefficient D in the rock material by the mass diffusion module of ABAQUSrockThe change rule of the interface water content can be well obtained through simulation calculation, the past experience method is effectively improved, and the test data are more accurate and scientific.
The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (7)
1. The test method for the consolidation strength of the water-containing oilstone interface of the asphalt pavement is characterized by comprising the following specific steps of:
s1, preparation before test: placing a stretching piece and a base in an oven for preheating, wherein the stretching piece and the base are both of cuboid structures, and placing asphalt in the oven for heating until the asphalt is in a flowing state;
s2, preliminary preparation of test pieces: coating asphalt on the surface of the base to form a rectangular consolidation layer, bonding a tensile piece on the consolidation layer, connecting the tensile piece and the base through the consolidation layer to form a test piece, and measuring and calculating the consolidation area S of the consolidation layert；
S3, preparation of test pieces with different soaking times: placing the test piece prepared in the S2 and a matched test piece in accessory equipment with preset temperature, wherein the matched test piece comprises a base, an asphalt bonding layer and a tensile piece, the base of the test piece and the base of the matched test piece are immersed in distilled water of the accessory equipment, the immersion height of the base is smaller than the overall height of the base, the immersion time of the base is changed, and test piece samples with different immersion times and matched test piece samples with different immersion times are prepared;
s4, determination of the shear failure strength of the test piece: immediately placing the test piece samples with different soaking times prepared in the S3 into a shear tester with preset temperature for the consolidation strength of the bituminous pavement water-containing oilstone interface for shear test, recording the shear failure load F of each test piece, and obtaining the consolidation area S according to the S2tCalculating to obtain the shear failure strength R of each test piecet；
S5, simulation calculation of the water content of the hydro-oilstone interface of the matched test piece: adopting a mass diffusion module of ABAQUS, and setting a water diffusion coefficient D in the mass diffusion module according to the material of the matched test piece prepared in S3rockThe water concentration of all the surfaces of the matched test piece immersed in the water is regulated to be 1, the relation between the immersion time of the matched test piece and the water content of the water-oil-stone interface of the matched test piece is simulated and calculated, and the shear failure strength R of the test piece with different immersion times is obtained by combining S4tObtaining the water content of the water-oil-stone interface of the test piece and the shear failure strength R of the test piecetThe relationship between;
the simulation calculation of the interface water content in the step S5 meets the following conditions:
wherein
Indicates the interfacial water content, CmAs the concentration of the water content, the concentration of the water,
is the concentration limit value of the test piece moisture bearing.
2. The method for testing the interfacial consolidation strength of the hydrous oilstone on the bituminous pavement according to claim 1, wherein the tensile member and the base in the step S1 are placed in an oven at 80-120 ℃ and preheated for 5-20min, the size of each of the tensile member and the base is 40 x 10mm cuboid stone, the asphalt in the step S1 is one of conventional asphalt, modified asphalt or asphalt cement, and the matched test piece in the step S3 is identical to the test piece prepared in the step S2.
3. The asphalt pavement water-containing oilstone interface consolidation strength test method according to claim 1, wherein the accessory equipment in S3 is a small-sized constant-temperature water bath tank (14), the lower part of the inner side wall of the small-sized constant-temperature water bath tank (14) is provided with a temperature sensor (12), the outer side wall of the small-sized constant-temperature water bath tank (14) is provided with a control dial (15), the lower part of the outer side wall of the small-sized constant-temperature water bath tank (14) is provided with a temperature control element (13) extending into the small-sized constant-temperature water bath tank (14), the temperature control element (13) is horizontally arranged in the small-sized constant-temperature water bath tank (14), the temperature control element (13) is a U-shaped immersion type electric heating pipe, and the temperature sensor (12) and the temperature control element (13) are both connected with the external control dial (15) through.
4. The method for testing the consolidation strength of the hydrous oilstone interface of the bituminous pavement according to claim 3, wherein the shear tester for the consolidation strength of the hydrous oilstone interface of the bituminous pavement in S4 comprises a base (8) and a temperature-controlled test chamber (10);
the base (8) comprises a first plate (8-1) and a cuboid cavity (8-3), the first plate (8-1) is directly contacted with the ground, the cuboid cavity (8-3) is mutually perpendicular to and integrally connected with the first plate (8-1), a second plate (8-2) parallel to the first plate (8-1) is arranged in the cuboid cavity (8-3), the cuboid cavity (8-3) is divided into an upper part and a lower part by the second plate (8-2), a compressor (11) is arranged at the lower part of the cuboid cavity (8-3), a motor (7) is arranged at the upper part of the cuboid cavity (8-3), a temperature control test box (10) is integrally arranged at the top of the base (8), and an exhaust pipe of the compressor (11) is connected with an air inlet of the temperature control test box (10), the compressor (11) is used for controlling the temperature in the temperature control test box (10), and the motor (7) is connected with an external computer through a data transmission line (9);
an upper cross beam (1) is fixedly arranged at the top end inside the temperature control test box (10), a lower jaw (6) is fixedly arranged at the central position of the bottom end inside the temperature control test box (10), two ends of the upper cross beam (1) are respectively and movably connected with a lead screw (5), the lead screws (5) are perpendicular to the bottom end of the temperature control test box (10), the lead screws (5) are movably connected with the bottom end inside the temperature control test box (10), two lead screws (5) are movably connected with a lower cross beam (2), the lower cross beam (2) is parallel to the upper cross beam (1), the central axis of the lower cross beam (2) in the vertical direction is superposed with the central axis of the temperature control test box (10) in the vertical direction, the lower cross beam (2) is connected with the upper jaw (4) through a hinged chain rod (3), and the bottom ends of the two lead screws (5) are respectively connected with the output end of a motor (, and a shearing force sensor is arranged on the lower cross beam (2) and is connected with an external computer through a data transmission line (9).
5. The asphalt pavement water-containing oilstone interface consolidation strength test method according to claim 4, characterized in that the central axis of the upper jaw (4) in the vertical direction and the central axis of the lower jaw (6) in the vertical direction are staggered, the upper jaw (4) is fixed on the lower cross beam (2) through the hinged chain rod (3), the motor (7) drives the screw rod (5) to rotate, and the screw rod (5) drives the lower cross beam (2) to move upwards or downwards along the screw rod (5).
6. The method for testing the consolidation strength of the water-containing oilstone interface of the asphalt pavement according to claim 4, characterized in that when the test temperature is required to be higher than 0 ℃, the water in the small constant-temperature water bath box (14) and the temperature control test box (10) are controlled to be at the required temperature, then the test piece is placed in the small constant-temperature water bath box (14) for culture, after the culture is finished, the test piece is rapidly placed in the temperature control test box (10), and the shear test is carried out immediately after the stabilization is carried out for 3-8 min;
when the test temperature is less than 0 ℃, firstly controlling the water in the small-sized constant-temperature water bath box (14) at 4-6 ℃, controlling the temperature of the temperature control test box (10) at the temperature required by the test, then putting the test piece into the small-sized constant-temperature water bath box (14) for culture, taking out the test piece to be wrapped by the preservative film in a winding way after the culture is finished, immediately putting the test piece into the temperature control test box (10), controlling the temperature to enable the temperature of the test piece to reach the test temperature, finally removing the preservative film, and carrying out a shear test after stabilizing for 3-8 min.
7. The method for testing the consolidation strength of the hydrous oilstone interface of an asphalt pavement according to claim 1, wherein the consolidation area S in S2 is S2tSatisfies StA × b × 3/4, wherein a is the length of the tensile member or base, b is the width of the tensile member or base, and a and b are both 40mm, shear failure load F and consolidation area S in S4tAnd shear failure strength RtSatisfy Rt×St＝F。
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