CN110196318B - Method for detecting fusion degree of cement emulsified asphalt and old asphalt - Google Patents
Method for detecting fusion degree of cement emulsified asphalt and old asphalt Download PDFInfo
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- CN110196318B CN110196318B CN201910475498.XA CN201910475498A CN110196318B CN 110196318 B CN110196318 B CN 110196318B CN 201910475498 A CN201910475498 A CN 201910475498A CN 110196318 B CN110196318 B CN 110196318B
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Abstract
The method is based on a time scanning mode in a dynamic rheometer, calculates the fusion degree of the emulsified asphalt cold-recycling mixture cement emulsified asphalt and the old asphalt by the composite shear modulus of a cement emulsified asphalt/old asphalt double-layer unfused test piece and a cement emulsified asphalt/old asphalt double-layer fused test piece, optimizes the construction process and the mix proportion design of the emulsified asphalt cold-recycling mixture, provides scientific basis for the optimal design of the cold-recycling pavement material based on the interface effect, and lays a foundation for improving the performance and the applicability of the cold-recycling pavement.
Description
Technical Field
The invention relates to the technical field of recycling of asphalt pavements in road engineering, in particular to a method for detecting the fusion degree of cement emulsified asphalt and old asphalt.
Background
At present, the amount of waste asphalt mixture (RAP) produced by the annual major and medium repair and maintenance of asphalt pavements in China is about 2 hundred million and more tons, and the most important of the world is. How to realize the high-efficiency regeneration of the RAP has important practical significance for environmental protection, effective utilization of resources and realization of the sustainable development of the pavement. At present, the utilization rate of RAP in China is less than 30%, but the utilization rate of RAP in developed countries is up to more than 90%. For the recycled asphalt mixture, the fusion degree of the new cementing material and the old asphalt on the RAP surface is one of the most important points for the recycling application of the waste asphalt mixture, which is directly related to the overall performance and the service life of the recycled asphalt pavement. The method aims at the hot recycling asphalt mixture, related detection methods are available, but the utilization rate of the hot recycling technology on the waste asphalt mixture is relatively low, the construction temperature is high and generally reaches 170-190 ℃, a large amount of harmful gases such as carbon dioxide and asphalt smoke are generated, and the environmental protection is not facilitated.
The cold-recycling emulsified asphalt mixture is a multi-phase composite material composed of emulsified asphalt, cement, RAP and other different materials, can consume RAP in large quantity, is constructed at normal temperature, and has remarkable economic and environmental benefits. As a multiphase composite material, the interface formed by the composite mucilage and the old asphalt on the surface of the RAP when two cementing materials of cement and emulsified asphalt coexist is an extremely important microstructure, and whether the interface can effectively transmit load depends on the fusion degree of the cement emulsified asphalt and the old asphalt. For a cold-recycling mixture, namely a material with the performance between flexibility and rigidity, strengthening and toughening are composite targets, an interface is an important medium for realizing strengthening and toughening, but the fusion degree of mucilage and old asphalt is not paid enough attention, so that the technology has technical bottlenecks of 'neck', such as low performance, poor universality, slow open traffic and the like.
Firstly, when cold-recycling mix design is performed, the waste asphalt mix is generally regarded as "black aggregate", and the influence of the surface old asphalt is neglected. In fact, due to the existence of the old asphalt on the RAP surface, the structure and the performance of the cement emulsified asphalt/RAP interface area are different from those of the cement emulsified asphalt/aggregate, and the structure and the performance of the interface area are difficult to accurately master, so that the performance of the cold-recycling mixture is difficult to accurately control and predict.
Secondly, as the cold-recycling mixture is mixed at normal temperature, RAP is not heated, and the cement-emulsified asphalt mucilage and the solid old asphalt on RAP cannot realize the fusion of the dynamic new and old asphalt in similar thermal recycling based on compatible thermodynamics. In the regeneration process, because the stirring time is short and the old asphalt is in a hard and brittle state, the old asphalt on the RAP surface cannot be completely fused with the cement-emulsified asphalt, so that a soft interlayer is easily formed at the interface of the cement-emulsified asphalt/the old asphalt. Under the action of load, the weak interlayer in the cold recycled asphalt mixture can form fine cracks, and the pavement performance of the recycled asphalt mixture is reduced.
In addition, the cement emulsified asphalt mortar serving as a porous structure material has poor moisture penetration resistance, and water molecules and H + easily enter an adhesion layer between the mortar and RAP from pores, so that the mortar is easy to peel off, and an interface becomes a weak part of a cold-recycling mixture. Thus, it often becomes the origin of micro-damage from the interface and breaks the connection, through-connection, ultimately leading to macro-damage of the mix.
In the prior art, the testing methods such as an X-ray scanning electron microscope, a gel chromatography, a Fourier infrared spectrum and a transmission electron microscope have good spatial resolution, and can be used for testing the fusion degree between the polymer and the polymer, but the testing methods have higher difficulty and expensive instruments. In addition, heavy elements are generally required for labeling when testing the degree of fusion, and these tracer molecules may slow down the mass transfer process and affect the fusion process.
Disclosure of Invention
Rheology, as a basic discipline, has been proven by numerous experiments to allow convenient and effective research into many problems in polymer science. Theoretically, the fundamental premise behind the investigation of polymer physicochemical problems by rheological methods is that any physicochemical change that causes a change in the viscoelasticity of the system will produce a response in the rheological parameters. The cement emulsified asphalt mortar and the old asphalt are viscoelastic materials, and the change of the interface of the double-layer mixing system of the cement emulsified asphalt mortar and the old asphalt inevitably causes the change of rheological parameters.
Therefore, in order to avoid the defects in the prior art, the invention provides a method for detecting the fusion degree of cement-emulsified asphalt and old asphalt based on dynamic rheology.
Means for solving the technical problem
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for detecting the fusion degree of cement emulsified asphalt and old asphalt comprises the following steps:
(1) preparing old asphalt and cement emulsified asphalt;
(2) respectively preparing an old asphalt test piece, a cement emulsified asphalt test piece and a cement emulsified asphalt/old asphalt double-layer fusion test piece;
(3) superposing the old asphalt test piece and the cement emulsified asphalt test piece to prepare a cement emulsified asphalt/old asphalt double-layer unfused test piece;
(4) respectively calculating the composite shear modulus of a cement emulsified asphalt/old asphalt double-layer fusion test piece and a cement emulsified asphalt/old asphalt double-layer non-fusion test piece by using a dynamic shear rheometer;
(5) the fusion degree of the cement emulsified asphalt and the old asphalt is detected according to the following formula:
wherein D is a degree of fusion (%),
is the ith composite shear modulus (MPa) of a cement emulsified asphalt/old asphalt double-layer fusion test piece,
the composite shear modulus is the ith composite shear modulus (MPa) of a cement emulsified asphalt/old asphalt double-layer non-fused test piece; n is the total number of test data.
Preferably, the step (1) comprises:
(1.1) preparation of old asphalt
Selecting a waste asphalt mixture for testing, and recovering the waste asphalt in the waste asphalt mixture according to a method for recovering asphalt from the asphalt mixture (an Abson method) (T0726-2011) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011);
(1.2) preparation of Cement-emulsified asphalt
And adding cement into the emulsified asphalt and uniformly stirring to prepare the cement emulsified asphalt.
Preferably, the step (2) includes:
(2.1) preparation of old asphalt test piece
Dripping heated old asphalt into a prepared test piece ring, then putting the test piece ring into a constant-temperature oven, taking out the test piece ring after the old asphalt is heated, melted and leveled, and putting the test piece ring into a drying dish for cooling;
(2.2) preparation of Cement emulsified asphalt/old asphalt double-layer fusion test piece
Dripping cement emulsified asphalt on an old asphalt test piece to form a film with uniform thickness;
(2.3) preparation of Cement-emulsified asphalt test piece
And dripping cement emulsified asphalt into the test piece ring to form a film with uniform thickness.
Preferably, the step (2) further comprises:
and curing and cooling the prepared old asphalt test piece, the cement emulsified asphalt test piece and the cement emulsified asphalt/old asphalt double-layer fusion test piece.
Preferably, the step (3) includes:
and (3) overlapping the old asphalt test piece and the cement emulsified asphalt test piece in a mode that the old asphalt test piece is arranged below and the cement emulsified asphalt test piece is arranged above to prepare a cement emulsified asphalt/old asphalt double-layer unfused test piece.
Preferably, the step (4) includes:
(4.1) setting the temperature of the environment chamber of the dynamic shear rheometer to be 40-50 ℃, and placing the cement emulsified asphalt/old asphalt double-layer fusion test piece into the environment chamber;
(4.2) setting the test temperature to be 15-25 ℃, adopting a strain control mode, setting the dynamic shear strain level to be 3% and the shear frequency to be 10Hz, and then carrying out heat preservation for 10-20 min;
(4.3) carrying out a time scanning test for 30s after the heat preservation is finished, and after the test is finished, exporting test data to obtain the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer fusion test piece within 30 s;
and (4.4) exiting the test mode, setting the temperature of the environmental chamber to be 90-110 ℃, and removing the test piece in the environmental chamber after the temperature is reached.
Preferably, the step (4) further comprises:
and (4.1) repeating the steps (4.1) to (4.3) to obtain the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer unfused test piece.
Preferably, the step (4) further comprises:
and respectively extracting the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer fusion test piece and the cement emulsified asphalt/old asphalt double-layer non-fusion test piece in the 21 st to 30 th seconds, and calculating the fusion degree of the cement emulsified asphalt and the old asphalt.
Preferably, in the step (2):
the test piece ring is placed on the glass bottom plate coated with the talcum powder separant, and meanwhile, the talcum powder separant is uniformly coated on the inner wall of the test piece ring.
Preferably, in the step (2):
the dropping amount of the old asphalt is 0.25 plus or minus 0.01g, and the dropping amount of the cement emulsified asphalt is 0.50 plus or minus 0.01 g.
Has the advantages that:
by using the method, the fusion degree of the cement emulsified asphalt and the old asphalt can be simply and quantitatively determined based on dynamic rheology according to the viscoelasticity attribute of the material. The method can provide a method for road engineering design units, construction units and the like, so as to optimize the mix proportion design and production process of the cold recycled mixture, eliminate the influence of a weak interface on the structure and the performance of the cold recycled mixture, improve the mechanical property and the application range of the cold recycled mixture, solve the technical bottleneck of 'neck' restricting the high-efficiency application of the cold recycled mixture, and improve the resource utilization level of waste asphalt pavement materials in China; meanwhile, the technology can indirectly assist the resource-saving and environment-friendly construction level of the road infrastructure in China, and has remarkable social and economic benefits.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the disclosed methods of the invention.
FIG. 1 shows the dynamic shear rheological test results of a cement-emulsified asphalt/old asphalt double-layer fusion test piece.
FIG. 2 shows the results of dynamic shear rheology tests on cement-emulsified asphalt/old asphalt double-layer non-fused test pieces.
Detailed Description
In the following detailed description, numerous specific details are set forth in order to provide a better understanding of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. Methods and means well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
The basic idea of the method for detecting the fusion degree of the cement emulsified asphalt and the old asphalt provided by the invention is as follows: respectively pouring and molding a cement emulsified asphalt and an old asphalt unfused test piece and a fused test piece, testing the change of the composite shear modulus of the two test pieces along with the test piece under a certain condition by using a test piece scanning mode of a dynamic rheometer, and then calculating the relative change of the composite shear modulus according to a test result to be used as the fusion degree of the two test pieces. The method specifically comprises the following steps:
1. selecting waste asphalt mixture RAP for testing, and recovering the waste asphalt in the RAP according to a method for recovering asphalt from asphalt mixture (an Abson method) (T0726-2011) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011) for standby.
2. Adding 60-80g of emulsified asphalt into a beaker, then adding 20-40g of cement, and slowly and uniformly stirring by using a glass rod for 30-90s to obtain the cement emulsified asphalt for later use.
3. And (3) placing the test piece rings on a glass base plate coated with the talcum powder separant, and simultaneously uniformly coating the talcum powder separant on the inner walls of the test piece rings. Wherein, preferably, the inner diameter of the test piece ring is 15.9 +/-0.1 mm, the wall thickness is 2.8 +/-0.1 mm, and the wall height is 6.5 +/-0.1 mm.
4. And then dropping the heated old asphalt into the test piece ring by 0.25 +/-0.01 g, then placing the test piece ring into a constant-temperature oven at the temperature of 120-160 ℃, immediately and carefully taking out the test piece ring after the old asphalt test piece is heated, melted and leveled, and placing the test piece ring into a drying dish for cooling for later use, thus preparing two groups.
It should be noted that the test piece needs to be placed horizontally in the oven, avoiding having an inclination.
5. And then taking out a group of old asphalt test pieces, continuously dripping 0.50 +/-0.01 g of cement emulsified asphalt on the old asphalt test pieces, and forming a film with uniform thickness to obtain a cement emulsified asphalt/old asphalt double-layer fusion test piece (test piece A). And simultaneously, 0.50 +/-0.01 g of cement-emulsified asphalt is dripped into the last group of empty test piece rings to form a film with uniform thickness, so that cement-emulsified asphalt test pieces are obtained.
6. And (3) placing the glass bottom plate with the 3 groups of test piece rings into a constant-temperature oven at 30-50 ℃, curing for 48-96h, taking out, and placing into a drying dish for cooling for 20-40 min.
7. And (3) slightly taking out the test piece from the test piece ring, slightly stacking the cement emulsified asphalt test piece and the old asphalt test piece which are prepared separately, wherein the old asphalt is arranged at the lower part and the cement emulsified asphalt is arranged at the upper part, and obtaining the cement emulsified asphalt/old asphalt double-layer unfused test piece (test piece No. B).
8. And opening the dynamic shear rheometer, selecting a metal plate with the diameter of 8mm and a loading device, fixing the metal plate and the loading device on the rheometer, and adjusting the zero clearance level of the metal plate and the loading device.
9. Setting the temperature of an environmental chamber of a dynamic shear rheometer to be 40-50 ℃, lifting a loading device after the temperature reaches, placing the test piece A on a metal plate, and setting the gap level to be 1-3 mm; and then putting down the loading device, extruding the test piece, trimming redundant test pieces along the edge of the metal plate by using a heated scraper until the redundant test pieces are flush with the outer diameter of the plate, carefully cleaning the surface of the test plate, and then closing the environmental chamber.
10. Setting the test temperature at 15-25 deg.C, adopting strain control mode, dynamic shear strain level at 3% and shear frequency at 10Hz, and then performing heat preservation for 10-20 min.
11. And (4) carrying out a time scanning test for 30s after the heat preservation is finished, and exporting test data after the test is finished to obtain the composite shear modulus of the test piece in 30 s.
It should be noted that the composite shear modulus is automatically calculated by a dynamic shear rheometer.
12. And (4) exiting the test mode, setting the temperature of the environmental chamber to be 90-110 ℃, and removing the test piece on the loading device and the metal plate after the temperature reaches.
13. Referring to steps 8-11 above, the time sweep test was also performed for test No. B, and the test data was derived to obtain the composite shear modulus for the test within 30 s.
It should be noted that, as the test time is prolonged, the test piece will generate fatigue failure, which will affect the test result. Therefore, in the present embodiment, the composite shear modulus in the first 30s period in which the test data is stable is preferable.
14. Considering that the accuracy of the test result can be caused by the unstable set shear strain level of the data of the first 10s, the composite shear modulus in the A test piece and the B test piece is respectively extracted, the data is processed, and the fusion degree of the cold-recycling mixture cement-emulsified asphalt and the old asphalt is calculated according to the following formula (1).
Wherein D is a degree of fusion (%),
the i-th composite shear modulus (MPa) of the specimen No. a in which fusion occurred,
the i-th composite shear modulus (MPa) of the no-fusion test piece B; n is the total number of test data.
Note that the "processing data" includes: when a measurement value in a group of measurement values differs from the average value by more than 1.15 times the standard deviation, the measurement value should be discarded, and the average value of the remaining measurement values is taken as the final test result.
Examples：
1. Selecting about 1200g of waste asphalt mixture RAP for testing, and recovering the waste asphalt in the RAP for later use according to a method for recovering asphalt from asphalt mixture (Abson method) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011).
2. Adding 60-80g of emulsified asphalt into a beaker, then adding 30g of cement, and slowly and uniformly stirring by using a glass rod for 60s to obtain the cement emulsified asphalt for later use.
3. And (3) placing the test piece rings on a glass base plate coated with the talcum powder separant, and simultaneously uniformly coating the talcum powder separant on the inner walls of the test piece rings. Wherein, preferably, the inner diameter of the test piece ring is 15.9 +/-0.1 mm, the wall thickness is 2.8 +/-0.1 mm, and the wall height is 6.5 +/-0.1 mm.
4. And then dripping the heated old asphalt into a test piece ring by 0.25 +/-0.01 g, then putting the test piece ring into a constant-temperature oven at 140 ℃, immediately and carefully taking out the test piece ring after the old asphalt test piece is heated, melted and leveled, putting the test piece ring into a drying dish, and cooling the test piece ring for later use to prepare two groups.
5. And then taking out a group of old asphalt test pieces, continuously dripping 0.50 +/-0.01 g of cement emulsified asphalt on the old asphalt test pieces, and forming a film with uniform thickness to obtain a cement emulsified asphalt/old asphalt double-layer fusion test piece (test piece A). And simultaneously, 0.50 +/-0.01 g of cement-emulsified asphalt is dripped into the last group of empty test piece rings to form a film with uniform thickness, so that cement-emulsified asphalt test pieces are obtained.
6. And (3) placing the glass bottom plate with the 3 groups of test piece rings into a constant-temperature oven at 40 ℃, curing for 72 hours, taking out, and placing into a drying dish for cooling for 30 min.
7. And (3) slightly taking out the test piece from the test piece ring, slightly stacking the cement emulsified asphalt test piece and the old asphalt test piece which are prepared separately, wherein the old asphalt is arranged at the lower part and the cement emulsified asphalt is arranged at the upper part, and obtaining the cement emulsified asphalt/old asphalt double-layer unfused test piece (test piece No. B).
8. The dynamic shear rheometer (commercially available as Lab + type dynamic shear rheometer from Malvern, Inc. is used in this example), a 8mm diameter metal plate and loading device are selected and fixed to the instrument, and the zero gap level between the metal plate and the loading device is adjusted.
9. Setting the temperature of an environmental chamber of a dynamic shear rheometer to be 45 ℃, lifting a loading device after the temperature reaches, placing a No. A test piece on a metal plate, and setting the gap level to be 2 mm; and then putting down the loading device, extruding the test piece, trimming redundant test pieces along the edge of the metal plate by using a heated scraper until the redundant test pieces are flush with the outer diameter of the plate, carefully cleaning the surface of the test plate, and then closing the environmental chamber.
10. Setting the test temperature to be 120 ℃, adopting a strain control mode, setting the dynamic shear strain level to be 3 percent and the shear frequency to be 10Hz, and then carrying out heat preservation for 15 min.
11. And (3) carrying out a time scanning test for 30s after the heat preservation is finished, and after the test is finished, exporting test data to obtain the composite shear modulus of the test piece in 30s, wherein the test result is shown in figure 1.
12. And (4) exiting the test mode, setting the temperature of the environmental chamber to be 100 ℃, and removing the loading device and the test piece on the metal plate after the temperature is reached.
13. Referring to steps 8-11 above, the time sweep test was also performed for test No. B, and the test data was derived to obtain the composite shear modulus for the test within 30s, and the test results are shown in fig. 2.
14. Considering that the data of the first 10s may cause the accuracy of the test result due to the unstable set shear strain level, the composite shear moduli in the test pieces A and B, 21-30s, are respectively extracted, the fusion degree of the cold-recycled mixture cement-emulsified asphalt and the old asphalt is calculated according to the following formula (1), the calculation result is shown in Table 1, and the data is processed to obtain the fusion degree of 0.29.
Wherein D is a degree of fusion (%),
the i-th composite shear modulus (MPa) of the specimen No. a in which fusion occurred,
the i-th composite shear modulus (MPa) of the no-fusion test piece B; n is the total number of test data.
TABLE 1 calculation of the degree of fusion of cement-emulsified asphalt with old asphalt
Verification example：
In order to verify the accuracy of the method of the invention, the existing infrared spectroscopy is adopted to test the fusion degree of the cement emulsified asphalt and the old asphalt, and infrared characteristic absorption peaks represent different functional groups, so that the functional groups which the asphalt and the cement do not have are adopted as marks, the hydroxyl terminated butadiene acrylonitrile rubber (CTBN) is adopted as a tracer, the ratio of the area of an acrylonitrile peak to the area of an anti-symmetric methyl peak is adopted as the relative content of the CTBN at a certain point, and the finally obtained fusion degree of the cement emulsified asphalt and the old asphalt is as follows: 0.33.
the test results are substantially identical to the results obtained with the method of the invention.
Embodiments of the present invention have been described above, and the above description is exemplary and not exhaustive. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The terms used herein are chosen to best explain the methods of the embodiments or to enable others of ordinary skill in the art to understand the disclosed embodiments of the invention.
Claims (9)
1. A method for detecting the fusion degree of cement emulsified asphalt and old asphalt comprises the following steps:
(1) preparing old asphalt and cement emulsified asphalt;
(2) respectively preparing an old asphalt test piece, a cement emulsified asphalt test piece and a cement emulsified asphalt/old asphalt double-layer fusion test piece;
(3) superposing the old asphalt test piece and the cement emulsified asphalt test piece to prepare a cement emulsified asphalt/old asphalt double-layer unfused test piece;
(4) respectively calculating the composite shear modulus of a cement emulsified asphalt/old asphalt double-layer fusion test piece and a cement emulsified asphalt/old asphalt double-layer non-fusion test piece by using a dynamic shear rheometer;
(5) the fusion degree of the cement emulsified asphalt and the old asphalt is detected according to the following formula:
in the formula, D is the fusion degree,
is the ith composite shear modulus of a cement emulsified asphalt/old asphalt double-layer fusion test piece, and the unit is MPa,
the composite shear modulus is the ith composite shear modulus of a cement emulsified asphalt/old asphalt double-layer non-fused test piece, and the unit is MPa; n is the total number of test data;
the step (2) comprises the following steps:
(2.1) preparation of old asphalt test piece
Dripping heated old asphalt into a prepared test piece ring, then putting the test piece ring into a constant-temperature oven, taking out the test piece ring after the old asphalt is heated, melted and leveled, and putting the test piece ring into a drying dish for cooling;
(2.2) preparation of Cement emulsified asphalt/old asphalt double-layer fusion test piece
Dripping cement emulsified asphalt on an old asphalt test piece to form a film with uniform thickness;
(2.3) preparation of Cement-emulsified asphalt test piece
And dripping cement emulsified asphalt into the test piece ring to form a film with uniform thickness.
2. The method of claim 1, wherein step (1) comprises:
(1.1) preparation of old asphalt
Selecting a waste asphalt mixture for testing, and recovering the waste asphalt in the waste asphalt mixture according to a method for recovering asphalt from the asphalt mixture (an Abson method) (T0726-2011) in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011);
(1.2) preparation of Cement-emulsified asphalt
And adding cement into the emulsified asphalt and uniformly stirring to prepare the cement emulsified asphalt.
3. The method of claim 2, wherein step (2) further comprises:
and curing and cooling the prepared old asphalt test piece, the cement emulsified asphalt test piece and the cement emulsified asphalt/old asphalt double-layer fusion test piece.
4. The method of claim 3, wherein step (3) comprises:
and (3) overlapping the old asphalt test piece and the cement emulsified asphalt test piece in a mode that the old asphalt test piece is arranged below and the cement emulsified asphalt test piece is arranged above to prepare a cement emulsified asphalt/old asphalt double-layer unfused test piece.
5. The method of claim 1, wherein the step (4) comprises:
(4.1) setting the temperature of the environment chamber of the dynamic shear rheometer to be 40-50 ℃, and placing the cement emulsified asphalt/old asphalt double-layer fusion test piece into the environment chamber;
(4.2) setting the test temperature to be 15-25 ℃, adopting a strain control mode, setting the dynamic shear strain level to be 3% and the shear frequency to be 10Hz, and then carrying out heat preservation for 10-20 min;
(4.3) carrying out a time scanning test for 30s after the heat preservation is finished, and after the test is finished, exporting test data to obtain the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer fusion test piece within 30 s;
and (4.4) exiting the test mode, setting the temperature of the environmental chamber to be 90-110 ℃, and removing the test piece in the environmental chamber after the temperature is reached.
6. The method of claim 5, wherein the step (4) further comprises:
and (4.1) repeating the steps (4.1) to (4.3) to obtain the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer unfused test piece.
7. The method of claim 6, wherein the step (4) further comprises:
and respectively extracting the composite shear modulus of the cement emulsified asphalt/old asphalt double-layer fusion test piece and the cement emulsified asphalt/old asphalt double-layer non-fusion test piece in the 21 st to 30 th seconds, and calculating the fusion degree of the cement emulsified asphalt and the old asphalt.
8. The method of claim 1, wherein in step (2):
the test piece ring is placed on the glass bottom plate coated with the talcum powder separant, and meanwhile, the talcum powder separant is uniformly coated on the inner wall of the test piece ring.
9. The method according to claim 1, characterized in that in step (2.1): the dropping amount of the old asphalt is 0.25 +/-0.01 g; in the step (2.2) and the step (2.3): the dropping amount of the cement emulsified asphalt is 0.50 +/-0.01 g.
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| CN111812308B (en) * | 2020-07-21 | 2022-06-17 | 山东交通学院 | Method for quantifying new-old asphalt interface fusion degree based on asphalt binder performance |
| CN112098319B (en) * | 2020-09-04 | 2022-10-28 | 南京林业大学 | Characterization method for interface adhesion of emulsified asphalt cold-recycling mixture |
| CN113607608B (en) * | 2021-09-02 | 2023-05-12 | 交通运输部公路科学研究所 | Method for evaluating interfacial interaction capability of cement emulsified asphalt cement and old asphalt |
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