CN111024556B - Device and method for evaluating diffusion capacity of regenerant in aged asphalt - Google Patents
Device and method for evaluating diffusion capacity of regenerant in aged asphalt Download PDFInfo
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- CN111024556B CN111024556B CN201911284445.6A CN201911284445A CN111024556B CN 111024556 B CN111024556 B CN 111024556B CN 201911284445 A CN201911284445 A CN 201911284445A CN 111024556 B CN111024556 B CN 111024556B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
Abstract
The invention belongs to the technical field of green environmental protection, relates to a thermal regeneration technology of an asphalt material, and particularly relates to a device and a method for evaluating the diffusion capacity of a regenerant in aged asphalt, which can eliminate interface influence. Aiming at the problem that in the prior art, when an asphalt sample is sampled after a regenerant and aged asphalt adopt a natural mixing and dissolving mode, the residual regenerant on the interface of the asphalt and the regenerant can obviously influence a test result, the technical scheme of the invention is that the method sequentially comprises the following steps: arranging a gasket on the upper part of the asphalt sample containing device, and pouring aged asphalt to be flush with the upper surface of the gasket; a regenerant sample holding device is arranged at the upper part of the gasket, and a regenerant is added; the aged asphalt added with the regenerant is subjected to high-temperature regeneration treatment; after the regeneration treatment is finished, removing the miscible substances of the asphalt and the regenerant at the corresponding part of the gasket after the regenerant is removed; and collecting an asphalt sample in the asphalt sample containing device to perform a performance test, thereby evaluating the diffusion capacity of the regenerant in the aged asphalt.
Description
Technical Field
The invention belongs to the technical field of green environmental protection, relates to a thermal regeneration technology of an asphalt material, and particularly relates to a device and a method for evaluating the diffusion capacity of a regenerant in aged asphalt, which can eliminate interface influence.
Background
The mileage of the highway in China at the end of 2018 exceeds 480 kilometers, the total mileage of the highway exceeds 14 kilometers, and more than 90 percent of the highway adopts asphalt pavement. After the asphalt pavement is operated for a period of time, diseases such as cracks, chaps, pits and the like can be generated, huge investment is needed to be invested for maintenance every year, and a heavy maintenance task is faced. The traditional maintenance method is to mill and plane the old pavement and then recover with the new asphalt mixture, thus generating a mass of old pavement materials and simultaneously mining new stones and crude oil. If the waste old asphalt mixture cannot be fully utilized, resource waste and environmental pollution are caused. The asphalt pavement recycling technology can fully utilize the original pavement materials, simultaneously reduce the exploitation of new stones, save resources and protect the environment. Thermal regeneration is considered to be the most valuable asphalt pavement regeneration technique because it can make full use of asphalt and aggregate in recycled asphalt pavement. The application core of the old asphalt pavement material is the regeneration and performance recovery of the old asphalt, and the addition of the regenerant becomes a main measure for recovering the performance of the old asphalt. Whether the in-situ thermal regeneration or the hot-mix plant regeneration is carried out, the old asphalt is wrapped on the surface of the old aggregate, and the rheological property needs to be recovered, so that the regenerant needs to be completely diffused into the aged old asphalt, the regenerant is fully fused with the old asphalt, and the properties of the old asphalt and the mixture thereof are recovered.
The diffusion capacity of the regenerant in the aged asphalt is directly related to the performance of the old asphalt mixture after thermal regeneration, however, the evaluation index of the regenerant at home and abroad is mainly based on a blending theory, namely, the regenerant with low viscosity and the old asphalt with high viscosity are mixed to soften the old asphalt, thereby recovering the rheological performance. The diffusion capability of the regenerant in the old asphalt directly influences the regeneration performance, and the existing evaluation device and method for the diffusion capability of the regenerant in the aged asphalt are lacked at home and abroad. With the increasing attention of people on environmental protection, pavement maintenance technology is also developed towards resource saving and environmental protection, the thermal regeneration technology is more and more widely applied, and test equipment and a method for evaluating the diffusion capacity of a regenerant in aged asphalt are necessary to be supplemented in order to ensure the regeneration effect. The existing methods for evaluating the effect of the regenerant mainly comprise the following steps: the regenerant is directly added into the regenerated asphalt mixture to evaluate the performance of the regenerated asphalt mixture, the effect of the regenerant is not only influenced by the regenerant, but also influenced by a plurality of complex factors such as forming conditions, evaluation methods and the like, and the reliability of the result is poor; the recycling agent is directly added into the recycled asphalt mixture, then the recovery asphalt in the recycled asphalt mixture is recycled by adopting an Abson method or a rotary evaporator method, and the recycled asphalt is evaluated, but the Abson method or the rotary evaporator method is influenced by a plurality of factors such as residual mineral powder, trichloroethylene solvent, time control of each stage and the like, so that the result reliability is poor.
Disclosure of Invention
The invention provides a device and a method for evaluating the diffusion capacity of a regenerant in aged asphalt, which can eliminate interface influence and aims to solve the problems that in the prior art, test equipment and a method for evaluating the diffusion capacity of the regenerant in the aged asphalt are lacked, and when an asphalt sample is sampled after the regenerant and the aged asphalt are mixed and dissolved naturally, the residual regenerant on an interface of the asphalt and the regenerant can obviously influence a test result: in the test of diffusivity evaluation, the diffusivity of the regenerant in the aged asphalt can be evaluated, the influence of the residual regenerant on the result can be eliminated, and the capability of the regenerant for recovering the performance of the aged asphalt can be reflected.
The technical scheme adopted by the invention is as follows:
a method for evaluating the diffusion capacity of a regenerant in aged asphalt comprises the following steps:
step (1), arranging a gasket with the thickness of 1-4mm on the upper part of an asphalt sample containing device, and pouring aged asphalt into the asphalt sample containing device until the aged asphalt is flush with the upper surface of the gasket;
step [2] arranging a regenerant sample holding device at the upper part of the gasket, and adding a regenerant into the regenerant sample holding device;
step (3) of carrying out high-temperature regeneration treatment on the aged asphalt added with the regenerant in the step (2);
after the regeneration treatment is finished, removing the regenerant, dismantling the regenerant sample holding device and the gasket, and removing the miscible substances of the asphalt and the regenerant at the corresponding part of the gasket;
and (5) collecting an asphalt sample in the asphalt sample containing device to perform a performance test so as to evaluate the diffusion capacity of the regenerant in the aged asphalt.
After the technical scheme is adopted, the interface of the regenerant and the aged asphalt sample is separated by using the gasket, then the gasket is taken down firstly during sampling, and the sample mixed and dissolved with the regenerant and the asphalt in the height corresponding to the gasket is cut off. Therefore, the influence of the residual regenerant on the evaluation result at the interface is avoided, and the test reproducibility, variability and accuracy are obviously improved.
Preferably, the asphalt sample containing device is composed of a plurality of asphalt sample containing rings with the same height, and asphalt samples in the asphalt sample containing rings are collected respectively in the step [5] to perform performance tests. The scheme is convenient for sampling the asphalt samples with different penetration depths of the regenerant and carrying out Dynamic Shear Rheology (DSR) test, and the precision and accuracy of the test result are higher.
Preferably, a comparison test is carried out while the high-temperature regeneration treatment is carried out on the aged asphalt sample added with the regenerant in the step [3], the high-temperature treatment under the same conditions is carried out on the asphalt sample not added with the regenerant, No. 0 asphalt is obtained by sampling the asphalt sample of the comparison test in the step [5], and No. i asphalt is obtained by sampling the ith asphalt sample containing ring from top to bottom in the step [5 ]; the specific process of the performance test in the step [5] is that after heating and melting, a DSR test is carried out on each asphalt sample to obtain a rutting factor Ri of the No. i asphalt; the standard for evaluating the diffusion capacity of the regenerant in the aged asphalt is a P value, and the calculation method of the P value comprises the following steps:
the larger the calculated P value is, the better the diffusion capability is, and the more excellent the ability of the regenerant to recover the performance of the aged asphalt is.
A Dynamic Shear Rheometer (DSR) with better precision is selected to test the performance of the asphalt, and the tested result has clear rheological physical significance, less asphalt consumption and more accurate result. Since most rejuvenating agents are sufficiently compatible with the aged bitumen in the first ring, using the top 1 st ring weight of 80%, the 2 nd ring of 15%, and the 3 rd ring of 5% according to a number of tests can make the evaluation more objective.
Preferably, the temperature of the high-temperature regeneration treatment in the step [3] is 150 ℃ and the time is 180min and 120 ℃.
Compared with the commonly used 100 ℃ parameter in the prior art, the temperature in the scheme is selected from 120-cost 150 ℃ and the time is selected from 120-cost 180min, because the mixing temperature is generally 150 ℃ and the time from mixing to transportation, paving and rolling is generally 3h no matter plant mixing thermal regeneration or in-situ thermal regeneration. Therefore, the parameters of the scheme are close to the regeneration process of the aged asphalt during field construction.
Preferably, the inner sides and the upper and lower top surfaces of the asphalt sample containing device and the gasket are coated with a separant, and the separant is high-vacuum silicone grease.
In the prior art, a talcum powder-glycerin mixture is generally used as the release agent, but the talcum powder-glycerin mixture can significantly influence the performance of the asphalt. This scheme adopts high vacuum silicone grease, can reach the effect of keeping apart pitch, can not produce big influence to the performance of pitch again simultaneously.
The invention also provides a device for evaluating the diffusion capacity of the regenerant in the aged asphalt, which can eliminate the interface influence, and comprises an asphalt containing device, a regenerant containing device and a bottom plate which are matched with each other, wherein a gasket is arranged between the asphalt containing device and the regenerant containing device.
The solution was to provide a stainless steel gasket with a thickness of about 1-4mm, and asphalt and regenerant miscibility in the gasket area were removed without evaluation when asphalt samples were collected for testing. Therefore, the influence of the interface of the regenerant and the aged asphalt on the evaluation result can be effectively eliminated.
Preferably, the asphalt containing device comprises a plurality of asphalt containing rings which are overlapped, an inserting part I is arranged at the upper part of each asphalt containing ring, a socket I is arranged at the lower part of each asphalt containing ring, and the inserting part I and the socket I are matched with each other; the gasket is arranged on the upper part of the inserting part I of the asphalt containing ring with the highest position in the asphalt containing rings; the recycling agent containing device comprises a recycling agent containing ring, a socket II is arranged on the lower portion of the recycling agent containing ring, and the gasket is matched with the socket II together with an insertion portion I of the asphalt containing ring with the highest position.
Preferably, the bottom plate is provided with a base protrusion I, and the base protrusion I is matched with the socket groove I of the asphalt containing ring with the lowest position in the plurality of asphalt containing rings.
Preferably, the bottom plate is further provided with a base protrusion II, and the base protrusion II is provided with an asphalt containing ring in a matching manner.
Preferably, the asphalt containing ring arranged on the base bulge II is provided with a sealing cover.
In the scheme, the installation structure between the asphalt containing rings is simple, and the asphalt containing rings are only required to be aligned and matched with each other for convenient test operation. And the base bulge II is additionally provided with an asphalt containing ring used as a comparison test, so that the performance of aged asphalt can be synchronously evaluated, the condition of inconsistent reference is avoided, and the evaluation accuracy is obviously improved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the stainless steel gasket with a certain thickness is arranged between the asphalt sample containing ring and the regenerant sample containing ring, when an asphalt sample is collected for testing, the gasket is taken down firstly, and the asphalt and regenerant mixed-dissolved sample within the corresponding height of the gasket is cut off without evaluation, so that the regenerant is eliminated from remaining on the surface of the asphalt, the influence of a regenerant and aged asphalt interface on an evaluation result is avoided, and the repeatability, variability and accuracy of the test are obviously improved; in addition, the asphalt is recycled firstly, so that the influence of the recycling link on the result is avoided, the recycled aged asphalt is used for evaluating the diffusion capacity of the regenerant, the test condition is simple, and the result reliability is high.
2. According to the method, the blank asphalt device under the same condition is arranged beside the device for heating and fusing the regenerant and the asphalt, so that the influence caused by different detection results of different batches of asphalt blank reference samples is eliminated, the inconsistency of the reference is avoided, and the accuracy of evaluation is obviously improved. Meanwhile, the device provided by the invention is convenient for sampling asphalt samples with different regenerant penetration depths, so that the test result is more accurate.
3. The DSR test is adopted to determine the rutting factors after asphalt regeneration, the test precision is higher, the repeatability is better, the physical significance is more definite, different weights are adopted according to the reduction degree of the rutting factors of the asphalt at different layers, the difference among different regenerants can be more shown, and the method is more effective in evaluating the advantages and the disadvantages of the diffusion capacities of the different regenerants.
4. In the prior art, a talcum powder-glycerin mixture is generally used as the release agent, but the talcum powder-glycerin mixture can significantly influence the performance of the asphalt. The high vacuum silicone grease is adopted in the invention, which can achieve the effect of isolating the asphalt and simultaneously can not generate great influence on the performance of the asphalt.
5. The installation structure between the asphalt containing rings is simple, and the asphalt containing rings are only required to be aligned and matched with each other for placement, so that the test operation is more convenient.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a cross-sectional view of a regenerant containment ring in accordance with the present invention;
FIG. 3 is a front view of a regenerant containment ring in accordance with the present invention;
FIG. 4 is a cross-sectional view of an asphalt containment ring of the present invention;
FIG. 5 is a front view of an asphalt containment ring of the present invention;
FIG. 6 is a top plan view of an asphalt containment ring of the present invention;
FIG. 7 is a bottom view of the closure of the present invention;
FIG. 8 is a cross-sectional view of the closure of the present invention;
fig. 9 is a schematic structural view of the base plate in the present invention.
Wherein: 1-bottom plate, 2-asphalt containing ring, 201-chamber i, 202-insert i, 203-socket groove i, 204-handle i, 3-gasket, 4-regenerant containing ring, 401-chamber ii, 402-insert ii, 403-socket groove ii, 404-handle ii, 5-cap, 501-side wall, 502-handle iii, 6-base bulge i, 7-base bulge ii.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1 to 9.
A method for evaluating the diffusion capacity of a regenerant in aged asphalt to eliminate interface influence comprises the following steps:
step (1), arranging a 1-4mm gasket on the upper part of an asphalt sample containing device, and pouring aged asphalt into the asphalt sample containing device until the aged asphalt is flush with the upper surface of the gasket;
step [2] arranging a regenerant sample holding device at the upper part of the gasket, and adding a regenerant into the regenerant sample holding device;
step (3) of carrying out high-temperature regeneration treatment on the aged asphalt added with the regenerant in the step (2);
after the regeneration treatment is finished, removing the regenerant, dismantling the regenerant sample holding device and the gasket, and removing the mixed solution of the asphalt and the regenerant at the corresponding part of the gasket;
and (5) collecting an asphalt sample in the asphalt sample containing device to perform a performance test so as to evaluate the diffusion capacity of the regenerant in the aged asphalt.
The asphalt sample containing device is composed of a plurality of asphalt sample containing rings with the same height, and asphalt samples in the asphalt sample containing rings are respectively collected in the step [5] to carry out performance tests.
Carrying out a comparison test while carrying out high-temperature regeneration treatment on the aged asphalt sample added with the regenerant in the step [3], carrying out high-temperature treatment on the asphalt sample without adding the regenerant under the same conditions, sampling the asphalt sample of the comparison test in the step [5] to obtain No. 0 asphalt, and sampling the ith asphalt sample containing ring from top to bottom in the step [5] to obtain No. i asphalt; the specific process of the performance test in the step [5] is that after heating and melting, a DSR test is carried out on each asphalt sample to obtain a rutting factor Ri of the No. i asphalt; the standard for evaluating the diffusion capacity of the regenerant in the aged asphalt is a P value, and the calculation method of the P value comprises the following steps:
the larger the calculated P value is, the better the diffusion capability is, and the more excellent the ability of the regenerant to recover the performance of the aged asphalt is.
The temperature of the high-temperature regeneration treatment in the step [3] is 150 ℃ and the time is 180 min.
The inside and upper and lower top surface coating of pitch appearance device and packing ring has the separant, the separant is high vacuum silicone grease.
The invention is further illustrated by the following specific examples.
Examples
The device for evaluating the diffusion capacity of the regenerant in the aged asphalt, which is used for eliminating the interface influence, comprises an asphalt containing device and a regenerant containing device which are matched with each other, wherein a gasket 3 is arranged between the asphalt containing device and the regenerant containing device. The gasket 3 is a stainless steel gasket having a thickness of 2 mm. Pitch splendid attire device includes pitch splendid attire circle 2 that three overlapping set up, and pitch splendid attire circle 2's middle part is provided with cavity I201, and pitch splendid attire circle 2's side is provided with two handles I204 and is convenient for operate, pitch splendid attire circle 2 upper portion is provided with insertion portion I202, pitch splendid attire circle 2 lower part is provided with socket I203, insertion portion I202 and socket I203 mutually support to realize the overlapping installation between a plurality of pitch splendid attire circles 2. The gasket 3 is arranged on the upper part of an insertion part I202 of the asphalt containing ring 2 with the highest position in the plurality of asphalt containing rings 2. Regenerant splendid attire device includes regenerant splendid attire circle 4, and regenerant splendid attire circle 4 structure is similar with pitch splendid attire circle 2, and the middle part of regenerant splendid attire circle 4 is provided with cavity II 401, the side of regenerant splendid attire circle 4 is provided with two handles II 404, regenerant splendid attire circle 4 lower part is provided with socket II 403, packing ring 3 and the highest pitch splendid attire of position circle 2 insert portion I202 jointly with socket II 403 cooperation. The height of the regenerant containing ring 4 is higher than that of the single asphalt containing ring 2 so as to contain a sufficient amount of regenerant.
Still include bottom plate 1, be provided with the protruding I6 of base on the bottom plate 1, the protruding I6 of base with the cooperation of the I203 in the socket joint groove of the lowest pitch splendid attire circle 2 in position among the several pitch splendid attire circle 2. The base plate 1 is further provided with a base protrusion II 7, and the base protrusion II 7 is provided with an asphalt containing ring 2 used for containing a contrast asphalt sample in a matching manner. A be provided with closing cap 5 on the pitch splendid attire circle 2 for splendid attire contrast pitch sample, the lateral wall 501 of closing cap 5 and pitch splendid attire circle 2 upper portion's the first 202 of inserting mutually cooperate, and closing cap 5 side is provided with handle III 502.
By adopting the device, the embodiment tests and evaluates the diffusion capacity of the regenerant in the aged asphalt, and the specific steps are as follows:
and (1) coating high-vacuum silicone grease serving as a separant on the inner side surfaces and the upper and lower top surfaces of each asphalt sample containing ring and the gasket, wherein the inner side surfaces are coated as little as possible.
And (2) sequentially placing the three asphalt sample containing rings and the gasket on the base bulge I on the left side of the chassis from bottom to top to assemble the diffusion capability test device. Simultaneously, an asphalt sample containing ring is placed on the base bulge II on the right side.
And (3) uniformly stirring the heated aged asphalt, and pouring the aged asphalt into a diffusion capacity testing device assembled on the left side, wherein the pouring surface is slightly higher than the gasket. And the same aged asphalt is poured into the asphalt sample containing ring on the right side, and the pouring surface is slightly higher than the upper edge of the asphalt sample containing ring. After cooling for 20min at room temperature, the aged asphalt of the left side diffusion capability test device higher than the gasket part and the aged asphalt of the right side asphalt sample containing ring higher than the upper edge part are scraped by a hot scraper.
And (4) placing a regenerant sample containing ring on a gasket of the left diffusion capability test device, and adding the regenerant to a position which is about 5mm below the upper edge of the regenerant sample containing ring. Meanwhile, the right asphalt sample containing ring is covered by a sealing cover.
And (5) putting the test device filled with the aged asphalt and the regenerant into a 140 ℃ oven, wherein the oven needs to be preheated for 30min in advance. The sample is heated in an oven for 3h, and the error is not more than +/-10 min.
And (4) taking the sample out of the oven after the sample in the step (6) is heated, and cooling for 30min at room temperature. And sucking the regenerant in the regenerant sample containing ring by using a plastic dropper till the interface of the regenerant and the asphalt. And taking down the regenerant sample containing ring and the gasket, and scraping off the asphalt higher than the top parts of the three overlapped asphalt sample containing rings by using a hot scraper.
And (7) taking off the asphalt sample containing ring positioned at the top of the three overlapped asphalt sample containing rings at the left side, scraping off asphalt higher than the second asphalt sample containing ring by using a hot scraper, and putting the asphalt into a crucible, wherein the part is marked as No. 1 asphalt for testing.
And (8) taking down the second asphalt sample containing ring, scraping the asphalt of the third asphalt sample containing ring higher than the bottom by using a hot scraper, and putting the asphalt into a crucible, wherein the part is marked as No. 2 asphalt for testing.
And (9) taking down the third asphalt sample containing ring at the bottom, scraping the residual asphalt by using a hot scraper, and putting the residual asphalt into a crucible, wherein the part is marked as No. 3 asphalt for testing.
And (10) taking down the sealing cover and an asphalt containing ring containing the comparison sample on the right side, scraping off asphalt by using a hot scraper, and placing the asphalt into a crucible, wherein the part is marked as No. 0 asphalt for testing.
And (11) respectively heating the No. 3 asphalt, the No. 2 asphalt, the No. 1 asphalt and the No. 0 asphalt until the asphalt is melted, uniformly stirring the mixture, pouring a sample, and performing a DSR test, wherein the test temperature is 76 ℃, recording rutting factors G x/sin, and respectively recording the obtained rutting factors as R3, R2, R1 and R0.
The following formula is used for calculation:
the larger the calculated P value is, the better the diffusion capability is, and the more excellent the ability of the regenerant to recover the performance of the aged asphalt is.
In the evaluation method of the embodiment, a Dynamic Shear Rheometer (DSR) with high precision is selected to test the performance of the asphalt, and the measured result has clear rheological physical significance, less asphalt consumption and higher result accuracy. Since most regenerants were able to diffuse into the first circle, this example used 80% of the weight of the 1 st circle, 15% of the 2 nd circle, and 5% of the 3 rd circle, making the evaluation more objective.
The diffusion performance of regenerant a (Evoflex CA-3 regenerant supplied by invitrogen invest limited) (denoted as a in the horizon representation) and regenerant B (T1 regenerant supplied by the institute of petroleum fuel oil, llc) (denoted as B in the horizon representation) were tested separately by the above-described methods. To illustrate the good resolution of the data obtained by the method of this example, comparative experimental data are also given for the same thermal regeneration process performed after mixing the aged bitumen samples with regular No. 90 bitumen PG58-22 (denoted C in the horizon representation) and SBS modified bitumen PG76-22 (denoted D in the horizon representation), respectively.
Note: (1) this test was obtained with aged bitumen: the SBS modified asphalt PG76-22 was aged in a film oven at 163 ℃ for 5 hours and then aged in a pressure aging apparatus at 100 ℃ under a pressure of 2.1MPa for 20 hours to obtain aged asphalt for testing.
(2) And evaluating the diffusion performance of the regenerant A, the regenerant B, the common asphalt and the SBS modified asphalt.
(3) Horizon-0 represents the control; horizons-1, -2, -3 represent the 1 st, 2 nd and 3 rd rings, respectively.
From the test data and the calculation of the P-value in the table above, it can be seen that:
1. although the aged samples obtained under the same conditions are affected by sampling, mixing and aging again, the test results of each test are not completely the same, and in order to ensure that the test standards are consistent, blank asphalt comparison samples under the same conditions must be set during the test.
2. The test result has very good distinguishability, and the regenerant A is an international known brand and has excellent diffusion performance; the regenerant B is a certain domestic brand, has slightly poorer diffusibility than the international famous brand, and still has better diffusibility; the viscosity of the common No. 90 asphalt is obviously higher than that of the regenerant A, B, P is 10.5, the diffusivity of the common No. 90 asphalt is obviously lower than that of the regenerant A, B, the viscosity of the SBS modified asphalt is obviously higher than that of the common No. 90 asphalt, and P is only 6.6% and basically has no diffusion.
In addition, the present invention uses the same rejuvenating agent, and when the apparatus and method of the present invention are used (without using a gasket), the results show that the evaluation results are significantly deviated due to the remanence remaining on the asphalt surface, and the reliability is not good.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (7)
1. A method for evaluating the diffusion capacity of a regenerant in aged asphalt is characterized by comprising the following steps of:
step (1), arranging a gasket on the upper part of an asphalt sample containing device, and pouring aged asphalt into the asphalt sample containing device until the aged asphalt is flush with the upper surface of the gasket;
step [2] arranging a regenerant sample holding device at the upper part of the gasket, and adding a regenerant into the regenerant sample holding device;
step (3) of carrying out high-temperature regeneration treatment on the aged asphalt added with the regenerant in the step (2);
after the regeneration treatment is finished, removing the regenerant, dismantling the regenerant sample holding device and the gasket, and removing the miscible substances of the asphalt and the regenerant at the corresponding part of the gasket;
collecting an asphalt sample in the asphalt sample containing device to perform a performance test so as to evaluate the diffusion capacity of the regenerant in the aged asphalt;
the asphalt sample containing device is composed of a plurality of asphalt sample containing rings with the same height, and asphalt samples in the asphalt sample containing rings are respectively collected in the step [5] to carry out performance tests;
carrying out a comparison test while carrying out high-temperature regeneration treatment on the aged asphalt sample added with the regenerant in the step [3], carrying out high-temperature treatment on the asphalt sample without adding the regenerant under the same conditions, sampling the asphalt sample of the comparison test in the step [5] to obtain No. 0 asphalt, and sampling the ith asphalt sample containing ring from top to bottom in the step [5] to obtain No. i asphalt; the specific process of the performance test in the step [5] is that after heating and melting, a dynamic shear rheological test is carried out on each asphalt sample to obtain a rutting factor Ri of the No. i asphalt; the standard for evaluating the diffusion capacity of the regenerant in the aged asphalt is a P value, and the calculation method of the P value comprises the following steps:
the larger the calculated P value is, the better the diffusion capacity of the regenerant is, and the more excellent the capacity of recovering the performance of the aged asphalt is.
2. The method of evaluating the ability of a rejuvenating agent to diffuse through aged asphalt as defined in claim 1, wherein: the temperature of the high-temperature regeneration treatment in the step [3] is 150 ℃ and the time is 180 min.
3. A method of evaluating the ability of a rejuvenating agent to diffuse in aged bitumen according to claim 1 or 2, characterised in that: the inside and upper and lower top surface coating of pitch appearance device and packing ring has the separant, the separant is high vacuum silicone grease.
4. A device for evaluating the diffusion capacity of a rejuvenating agent in aged asphalt according to any one of claims 1 to 3, characterized in that: the asphalt recycling device comprises an asphalt containing device and a recycling agent containing device which are matched with each other, wherein a gasket (3) is arranged between the asphalt containing device and the recycling agent containing device; the asphalt containing device comprises a plurality of asphalt containing rings (2) which are overlapped, wherein the upper parts of the asphalt containing rings (2) are provided with inserting parts I (202), the lower parts of the asphalt containing rings (2) are provided with socket grooves I (203), and the inserting parts I (202) and the socket grooves I (203) are matched with each other; the gasket (3) is arranged on the upper part of an insertion part I (202) of the highest asphalt containing ring (2) in the asphalt containing rings (2); regenerant splendid attire device includes regenerant splendid attire circle (4), regenerant splendid attire circle (4) lower part is provided with socket II (403), packing ring (3) and the highest pitch splendid attire of position circle I (202) jointly with socket II (403) cooperation.
5. The apparatus for evaluating the diffusibility of a rejuvenating agent in aged asphalt according to claim 4, wherein: still include bottom plate (1), be provided with protruding I (6) of base on bottom plate (1), protruding I (6) of base with the socket and spigot groove I (203) cooperation of the pitch splendid attire circle (2) of the lowest position in several pitch splendid attire circle (2).
6. The apparatus for evaluating the diffusibility of a rejuvenating agent in aged asphalt according to claim 5, wherein: the base plate (1) is further provided with a base protrusion II (7), and the base protrusion II (7) is provided with an asphalt containing ring (2) in a matching mode.
7. The apparatus for evaluating the diffusibility of a rejuvenating agent in aged asphalt according to claim 6, wherein: and a sealing cover (5) is arranged on the asphalt containing ring (2) arranged on the base protrusion II (7).
Priority Applications (1)
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| CN111548057B (en) * | 2020-06-08 | 2020-12-08 | 四川省公路规划勘察设计研究院有限公司 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
| CN111562156A (en) * | 2020-06-24 | 2020-08-21 | 内蒙古工业大学 | Method and mould for preparing microscopic analysis sample of double-layer asphalt diffusion system |
| CN112881142B (en) * | 2021-01-14 | 2022-01-04 | 北京科技大学 | Asphalt health-preserving test container and method for stepped erosion in dynamic water pressure environment |
| CN113188971B (en) * | 2021-04-09 | 2022-06-03 | 东南大学 | Non-reactive asphalt regenerant permeability evaluation method |
| CN114544389B (en) * | 2022-01-12 | 2023-09-15 | 中路交科检测技术有限公司 | Evaluation method for regeneration efficiency of asphalt regenerant |
| CN115235950B (en) * | 2022-07-22 | 2023-05-16 | 四川省公路规划勘察设计研究院有限公司 | Method for evaluating compatibility of regenerant and aged asphalt |
| CN117054294B (en) * | 2023-10-13 | 2024-01-30 | 哈尔滨工业大学 | Asphalt regenerant diffusion performance testing device and evaluation method |
| CN117606987B (en) * | 2024-01-22 | 2024-04-19 | 哈尔滨工业大学 | Asphalt regenerant permeation and diffusion performance testing device and testing method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788446A (en) * | 2010-03-10 | 2010-07-28 | 东南大学 | Method for detecting diffusion capacity of regenerant in aged asphalt |
| CN203025007U (en) * | 2013-01-14 | 2013-06-26 | 中国科学院南京土壤研究所 | Separable soil sample collector |
| CN104089802A (en) * | 2014-06-26 | 2014-10-08 | 河海大学 | Device and method for preparing true triaxial remolded sample by utilizing vacuum preloading |
| CN105300845A (en) * | 2015-12-08 | 2016-02-03 | 哈尔滨工业大学 | Asphalt regenerating agent diffusion test device and testing method |
| CN205280402U (en) * | 2015-12-31 | 2016-06-01 | 河海大学 | A device that is used for normal position layering survey soil moisture content |
| CN106950118A (en) * | 2017-03-13 | 2017-07-14 | 山东省交通科学研究院 | A kind of bi tumenf orr oad high temperature, low temperature performance method for quick |
| CN207401227U (en) * | 2017-10-11 | 2018-05-25 | 中国水产科学研究院黑龙江水产研究所 | A kind of quinolones detection and analysis filter device |
| CN110305491A (en) * | 2019-06-17 | 2019-10-08 | 葛洲坝武汉道路材料有限公司 | A kind of asphaltic base road surface mist sealing covers maintenance punishment material and preparation method thereof |
-
2019
- 2019-12-13 CN CN201911284445.6A patent/CN111024556B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788446A (en) * | 2010-03-10 | 2010-07-28 | 东南大学 | Method for detecting diffusion capacity of regenerant in aged asphalt |
| CN203025007U (en) * | 2013-01-14 | 2013-06-26 | 中国科学院南京土壤研究所 | Separable soil sample collector |
| CN104089802A (en) * | 2014-06-26 | 2014-10-08 | 河海大学 | Device and method for preparing true triaxial remolded sample by utilizing vacuum preloading |
| CN105300845A (en) * | 2015-12-08 | 2016-02-03 | 哈尔滨工业大学 | Asphalt regenerating agent diffusion test device and testing method |
| CN205280402U (en) * | 2015-12-31 | 2016-06-01 | 河海大学 | A device that is used for normal position layering survey soil moisture content |
| CN106950118A (en) * | 2017-03-13 | 2017-07-14 | 山东省交通科学研究院 | A kind of bi tumenf orr oad high temperature, low temperature performance method for quick |
| CN207401227U (en) * | 2017-10-11 | 2018-05-25 | 中国水产科学研究院黑龙江水产研究所 | A kind of quinolones detection and analysis filter device |
| CN110305491A (en) * | 2019-06-17 | 2019-10-08 | 葛洲坝武汉道路材料有限公司 | A kind of asphaltic base road surface mist sealing covers maintenance punishment material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 基于晶核分散理论的新型沥青再生剂研发及其性能评价;牛昌昌;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20180315(第03期);31页 * |
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