CN115235950B - Method for evaluating compatibility of regenerant and aged asphalt - Google Patents
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Abstract
The invention discloses a method for evaluating compatibility of asphalt regenerant and aged asphalt, which comprises the following steps: firstly, adopting an extraction test and an asphalt recycling test method to obtain aged asphalt; weighing the regenerant in a container, and heating and preserving the temperature of the container at high temperature to obtain the aging regenerant. And then taking the aged asphalt as a solute, taking the aged regenerant as a solvent, preparing solutions with different mass concentrations, fully and uniformly mixing, and testing the 60 ℃ viscosity of the solutions with different mass concentrations to obtain a standard curve of the viscosity-mass concentration of the aged asphalt and the aged regenerant. And then weighing aged asphalt and an intact regenerant in a certain mass ratio in a container, placing the container at a high temperature for natural fusion test, wherein the natural fusion test condition is consistent with the heating and heat preservation test condition of the regenerant, obtaining a fused aged asphalt regenerant solution after the test is finished, and testing the viscosity of the solution at 60 ℃. And finally, calculating the mass concentration of the aged asphalt in the solution according to a standard curve of the viscosity at 60 ℃ and the viscosity-mass concentration of the solution after the fusion is completed, so as to obtain the fusion degree of the regenerant and the aged asphalt. The method realizes quantitative evaluation of compatibility between the regenerant and the aged asphalt based on the relationship that the viscosity of the aged asphalt regenerant solution and the mass concentration of asphalt are in exponential function correlation.
Description
Technical Field
The invention relates to a performance evaluation method of an asphalt recycling agent, in particular to an evaluation method of compatibility of the asphalt recycling agent and aged asphalt, and belongs to the field of detection and evaluation of asphalt pavement material performance.
Background
Along with the annual increase of the mileage of the highways in China, the highways built in early stage enter a large-scale maintenance stage, and the traditional maintenance mode mostly adopts a milling and paving mode. The traditional maintenance mode can generate a large amount of asphalt mixture reclaimed materials (RAP) during milling, and if the RAP is abandoned, not only the land resources are occupied, but also the environment is polluted; and a large amount of sand and stone resources are also required for producing the asphalt mixture during paving, which is not beneficial to the protection of ecological environment. The recovery and utilization of the RAP not only can reduce the exploitation of sand and stone resources and protect the environment, but also can reduce the construction cost of asphalt pavement, save the construction cost, and have remarkable environmental protection benefit and economic benefit.
The asphalt pavement regeneration technology can be divided into a hot regeneration technology and a cold regeneration technology according to whether the mixture is heated or not, and compared with the cold regeneration technology, the hot regeneration technology has better mixture performance, and the applicable layers are relatively higher, so that the asphalt pavement regeneration technology has high application value. Because asphalt pavement is subjected to the actions of solar radiation and the like in the service process, asphalt can age, asphalt property becomes hard and crisp, and if RAP is directly applied to a thermal regeneration technology, the low-temperature performance and fatigue performance of a regeneration mixture are poor, and early diseases of the pavement are easy to occur. Therefore, in the implementation process of the asphalt pavement thermal regeneration technology, a certain proportion of asphalt regenerant is required to be added, so that the performance of the aged asphalt is recovered, and the comprehensive road performance of the asphalt mixture is further improved.
The performance recovery capability of the regenerant on the aged asphalt greatly influences the performance of the regenerated mixture, and researchers mostly adopt indexes such as penetration, ductility and the like of the regenerated asphalt tested after a certain proportion of the regenerant is mixed with the aged asphalt to judge the performance recovery capability of the regenerant. Whether in-plant heat regeneration or in-situ heat regeneration technology, the aged asphalt is firmly adhered to the surface of the raw aggregate in a film state with a certain thickness, and the mixture is mixed for a very short time, and the added regenerant and the aged asphalt are mainly naturally fused and gradually permeated into the aged asphalt film, so that the fusion effect of indoor heating and stirring cannot be achieved in the process. Therefore, the performance recovery capability of the regenerant for aged asphalt depends to a large extent on the compatibility of the regenerant with aged asphalt, and the better the compatibility, the better the performance recovery capability of the regenerant, and vice versa. However, there is no unified evaluation method and evaluation index for compatibility of the regenerant with aged asphalt.
Disclosure of Invention
The invention provides a method for evaluating the compatibility of an asphalt recycling agent and aged asphalt when an asphalt pavement thermal recycling technology is applied, which is simple and convenient to operate, and solves the problem that the compatibility of the asphalt recycling agent and the aged asphalt is difficult to evaluate quantitatively.
The technical scheme adopted by the invention is as follows:
a method for evaluating compatibility of a rejuvenating agent with aged asphalt, comprising the steps of:
step one: the old asphalt pavement mixture is subjected to an extraction test and an asphalt recovery test to obtain aged asphalt;
step two: weighing a certain mass of the original regenerant, pouring the original regenerant into a container, and preserving heat at a high temperature to obtain an aged regenerant;
step three: taking aged asphalt as a solute, taking an aging regenerant as a solvent, preparing solutions with different mass concentrations, heating, stirring, uniformly mixing, and testing the viscosity of the solutions with different mass concentrations at 60 ℃;
step four: fitting the viscosity of the solution at 60 ℃ with the mass concentration to obtain a standard curve and fitting parameters;
step five: pouring a certain mass of aged asphalt into a container, and recording the mass m of the poured asphalt 1 Heating to uniformly spread asphalt at the bottom of the container;
step six: after asphalt is evenly spread at the bottom of a container, pouring a certain mass of original regenerant into the container, and recording the mass m of the poured regenerant 2 Immediately placing the container at high temperature for heat preservation to enable the regenerant to be naturally fused with the aged asphalt;
step seven: pouring out the upper layer solution after natural fusion is completed, and testing the viscosity eta at 60 ℃;
step eight: and calculating to obtain the fusion degree P of the regenerant and the aged asphalt according to the viscosity eta of the natural fusion solution at 60 ℃ and the fitting parameters of the standard curve.
Preferably, the old asphalt pavement mixture in the first step is a common asphalt mixture or a modified asphalt mixture; the extraction test is a centrifugal separation method; the asphalt recycling test is a rotary evaporator method or an Abelsen method.
Preferably, the container in the second step has a capacity of 500ml; the quality of the original regenerant is 20-50 g; the heat preservation temperature is 120-160 ℃; the heat preservation time is 120-240 min.
More preferably, the container used in the second step is a conical flask, the heat preservation is performed in a high-temperature oil bath pot, and the height of the bottom of the conical flask below the oil bath liquid level is required to be more than 5cm during the heat preservation.
The second step is to heat and preserve heat under the same condition as the natural fusion in the sixth step to prepare an aging regenerant, and then the aging regenerant and the aging asphalt are adopted to obtain a standard curve according to the third step and the fourth step, so that inaccurate calculation results of the fusion degree P caused by inconsistent aging states of the regenerant and the regenerant in the solution after the natural fusion in the standard curve test are avoided.
Preferably, the concentration range of the solution with different mass concentration in the third step is 0% -50%; the number of the solutions with different mass concentrations is not less than 5 groups; the heating condition is not more than 160 ℃; the viscosity at 60 ℃ is the viscosity at 60 ℃ tested by a T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure. In order to test the solution viscosity when the regenerant and the aged asphalt are fully mutually dissolved, the regenerant and the aged asphalt are heated and stirred after being prepared according to the proportion, but the regenerant and the asphalt are possibly subjected to secondary aging due to the excessive temperature, so that the heating temperature is not higher than 160 ℃.
Preferably, in the fourth step, an exponential function based on a natural constant is adopted for fitting, the mass concentration is an independent variable during fitting, the viscosity at 60 ℃ is a dependent variable, and the requirement of the fitting correlation coefficient is that the absolute value is not lower than 0.99; the fitting parameters are a and b values in the following formula.
y＝a×e bx
Wherein: fitting dependent variables in y: viscosity at 60 ℃ of mm 2 /s；
xs fitting the argument: aged bitumen mass concentration,%;
e, changing natural constants;
a, b then fit the parameters.
The standard curve in the method is obtained by measuring the 60 ℃ viscosity of a plurality of standard solutions with known mass concentrations, the 60 ℃ viscosity of the solutions has a good exponential function relation with the mass concentration of the aged asphalt, the standard curve is the basis for calculating the concentration of the aged asphalt in the solution after the regenerant and the aged asphalt are naturally fused, and in order to ensure the accuracy of calculation results, the requirements on the fitted correlation coefficients are required.
Preferably, the container in the fifth step is a container consistent with the specification type in the second step; the mass of the aged asphalt is 3-20 g; the heating temperature is as follows: the old asphalt pavement is 140-160 ℃ when the old asphalt pavement is of a common asphalt mixture type, and the old asphalt pavement is 160-180 ℃ when the old asphalt pavement is of a modified asphalt mixture type; the heating time is 10-30 min.
More preferably, the heating in step five is performed in a high temperature oven.
Preferably, the quality of the original regenerant in the step six is 20-50 g; the heat preservation temperature and the heat preservation time are consistent with the heat preservation conditions in the second step.
Preferably, the method for calculating the fusion degree P in the step eight is as follows:
the greater the calculated degree of fusion P, the better the compatibility of the regenerant with aged asphalt.
After the regenerant and the aged asphalt are naturally fused in a high-temperature oil bath, a part of the aged asphalt can be dissolved in the regenerant, which is a process of fusing the regenerant and the aged asphalt when the temperature of the mixture is higher during the implementation of the simulated heat regeneration technology. When part of the aged asphalt is blended into the regenerant, the mass concentration of the aged asphalt is difficult to be measured by a direct means, and the mass concentration of the aged asphalt can be indirectly calculated through a viscosity-mass concentration standard curve and the viscosity of a blending solution. After natural fusion, the higher the concentration of the aged asphalt in the regenerant is, the more thoroughly the regenerant and the aged asphalt are fused, and the better the compatibility of the regenerant and the aged asphalt is. The degree of fusion P represents the ratio between the actual mass concentration and the maximum mass concentration of the aged asphalt in the regenerant after natural fusion, and when the P value is 100%, the fusion of all asphalt into the regenerant is shown.
The invention has the beneficial effects that: according to the evaluation method provided by the invention, on the basis of simulating the actual fusion mode of the regenerant and the aged asphalt in the implementation process of the thermal regeneration technology of the asphalt pavement, the compatibility of the regenerant and the aged asphalt can be quantitatively evaluated by utilizing the fact that the mass concentration of the aged asphalt has good exponential function correlation with the viscosity of the solution at 60 ℃. The test method is simple, the operation is simple and convenient, the quality of the aging asphalt required during the test is less, the test accuracy is high, and the compatibility of different regenerants and the aging asphalt can be effectively evaluated.
Drawings
FIG. 1 is a "viscosity-mass concentration" standard curve obtained when rapeseed oil is used as a regenerant
FIG. 2 is a "viscosity-mass concentration" standard curve obtained when furfural extract oil is used as a regenerant
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples, and it is apparent that the described examples are only some of the examples of the present application, but not all of the examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In the following examples, the old asphalt pavement mixture in the first step is a modified asphalt mixture type, and the asphalt recycling test adopts a rotary evaporator method. In the fifth step, the heating temperature is 170 ℃ and the heating time is 15min. The heat preservation in the second step and the sixth step is carried out in a high-temperature oil bath pot, the heat preservation temperature is 140 ℃, and the heat preservation time is 180 minutes.
Example 1
The method comprises the following specific operation steps:
1. sequentially carrying out a centrifugal separation method extraction test and a rotary evaporator method asphalt recycling test on the RAP material to obtain aged asphalt;
2. selecting a regenerant A (rapeseed oil) as an original regenerant for a test, respectively weighing 30g of the regenerant A in 12 500ml conical flasks, placing the conical flasks in an oil bath pot which is heated to 140 ℃ in advance for heat preservation, fixing the conical flasks well to avoid shaking, keeping the bottom of the conical flasks above 5cm below the oil bath liquid level for 180min, collecting the regenerants A in all the conical flasks together after heat preservation is completed, and uniformly stirring to obtain an aged regenerant A;
3. the aging asphalt is used as solute, the aging regenerant A is used as solvent, solutions with different mass concentrations are prepared in a stainless steel cup, and the solution is heated and stirred on an electric heating furnace, wherein the temperature of the solution is not more than 160 ℃ during heating. After the regenerant and the aged asphalt are completely fused, the solution is tested for viscosity at 60 ℃ according to the T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure. The solution formulation ratio and 60℃viscosity test results are shown in Table 1.
TABLE 1 solution configuration record Table of aged asphalt and aged regenerant A
| Numbering device | A-1 | A-2 | A-3 | A-4 | A-5 |
| Aged bitumen mass/ |
0 | 2.5 | 5.1 | 7.2 | 9.8 |
| Aging regenerant A mass/g | / | 50.0 | 51.0 | 48.0 | 49.0 |
| Mass concentration/% | 0 | 4.76 | 9.09 | 13.04 | 16.67 |
| Viscosity at 60 DEG C | 19.5 | 25.5 | 33.0 | 43.5 | 54.0 |
4. The viscosity at 60 ℃ in table 1 was exponentially fitted to the mass concentration to obtain a standard graph as shown in fig. 1, and the fitting parameters a=19.219, b= 0.0617, and the correlation coefficient r=0.999 of the standard graph were obtained.
5. Heating and melting the aged asphalt, uniformly stirring, pouring the aged asphalt into a clean 500ml conical flask, and pouring the aged asphalt into a conical flask with the mass of m 1 =3.9 g, then the flask was placed in an oven at 170 ℃ for 15min to allow the asphalt to uniformly spread on the bottom of the flask.
6. Taking out the conical flask with asphalt laid on the bottom from the oven, pouring the original regenerant A into the conical flask, and pouring the regenerant A with mass m 2 =30.2g. Then the conical flask is placed in an oil bath pot which is heated to 140 ℃ in advance, and the conical flask is fixed well so as to avoid shaking, and the bottom of the conical flask is above 5cm below the liquid level of the oil bath.
7. After the conical flask is kept in an oil bath for 180min, the conical flask is taken out, the upper layer solution is poured into a small beaker, and the viscosity eta at 60 ℃ and eta=21.3 mm of the solution are tested according to the T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure 2 /s。
8. The degree of fusion p=14.6% of the regenerant a with the aged asphalt was calculated from the test detection results.
Example 2
The method comprises the following specific operation steps:
1. performing a subsequent test using the aged asphalt obtained in the extraction and recovery test of example 1;
2. selecting a regenerant B (furfural extract oil) as an original regenerant for a test, respectively weighing 30g of the regenerant B in 12 500ml conical flasks, placing the conical flasks in an oil bath pot which is heated to 140 ℃ in advance for heat preservation, fixing the conical flasks well, avoiding shaking, keeping the bottom of the conical flasks above 5cm below the oil bath liquid level for 180min, collecting the regenerants B in all the conical flasks together after heat preservation is completed, and uniformly stirring to obtain an aged regenerant B;
3. the aging asphalt is used as solute, the aging regenerant B is used as solvent, solutions with different mass concentrations are prepared in a stainless steel cup, and the solution is heated and stirred on an electric heating furnace, wherein the temperature of the solution is not more than 160 ℃ during heating. After the regenerant and the aged asphalt are completely fused, the solution is tested for viscosity at 60 ℃ according to the T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure. The solution formulation ratio and 60℃viscosity test results are shown in Table 2.
TABLE 2 solution configuration record Table of aged asphalt and aged regenerant B
| Numbering device | B-1 | B-2 | B-3 | B-4 | B-5 |
| Aged bitumen mass/ |
0 | 2.2 | 4.8 | 7.6 | 10.1 |
| Mass/g of regenerant B | / | 44.0 | 48.0 | 50.7 | 50.5 |
| Mass concentration/% | 0 | 4.76 | 9.09 | 13.04 | 16.67 |
| Viscosity at 60 DEG C | 802.6 | 1113.0 | 1560.0 | 2155.2 | 2733.6 |
4. The viscosity at 60 ℃ in table 2 was exponentially fitted to the mass concentration to obtain a standard graph as shown in fig. 2, and a fitting parameter a=794.25, b=0.0748, and a correlation coefficient r=0.999 of the standard graph were obtained.
5. Heating and melting the aged asphalt, uniformly stirring, pouring the aged asphalt into a clean 500ml conical flask, and pouring the aged asphalt into a conical flask with the mass of m 1 =4.0 g, then the flask was placed in an oven at 170 ℃ for 15min to allow the asphalt to uniformly spread on the bottom of the flask.
6. Taking out the conical flask with asphalt laid on the bottom from the oven, pouring the original regenerant B into the conical flask, and pouring the regenerant with mass m 2 =30.5g. Then the conical flask is placed in an oil bath pot which is heated to 140 ℃ in advance, and the conical flask is fixed well so as to avoid shaking, and the bottom of the conical flask is 5em above the oil bath liquid level.
7. After the conical flask is kept in an oil bath for 180min, the conical flask is taken out, the upper layer solution is poured into a small beaker, and the viscosity eta at 60 ℃ and eta=1506 mm of the solution are tested according to the T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure 2 /s。
8. The fusion degree p=73.8% of the regenerant B with the aged asphalt was calculated from the test detection results.
According to the results of the above examples, the degree of fusion p=14.6% of the regenerant a with the aged asphalt, the degree of fusion p=73.8% of the regenerant B with the aged asphalt, and the compatibility of the regenerant B with the aged asphalt was significantly better than that of the regenerant a.
Claims (7)
1. A method for evaluating compatibility of a rejuvenating agent with aged asphalt, comprising the steps of:
step one: the old asphalt pavement mixture is subjected to an extraction test and an asphalt recovery test to obtain aged asphalt;
step two: weighing a certain mass of the original regenerant, pouring the original regenerant into a container, and preserving heat at a high temperature to obtain an aged regenerant;
step three: using aged asphalt as solute and aging regenerant as solvent to prepare solutions with different mass concentrations, heating and stirring
Testing the viscosity of the solutions with different mass concentrations at 60 ℃ after uniformly mixing;
step four: fitting the viscosity of the solution at 60 ℃ with the mass concentration to obtain a standard curve and fitting parameters;
step five: pouring a certain mass of aged asphalt into a container, recording the mass m1 of the poured asphalt, and heating to uniformly spread the asphalt at the bottom of the container;
step six: after asphalt is evenly spread at the bottom of a container, pouring a certain mass of original regenerant into the container, recording the mass m2 of the poured regenerant, and immediately placing the container at a high temperature for heat preservation to naturally fuse the regenerant with aged asphalt;
step seven: pouring out the upper layer solution after natural fusion is completed, and testing the viscosity eta at 60 ℃ after collection;
step eight: calculating to obtain the fusion degree P of the regenerant and the aged asphalt according to the fitting parameters of the standard curve and the viscosity eta of the natural fusion solution at 60 ℃;
the method for calculating the fusion degree P in the step eight comprises the following steps:
2. a method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: the old asphalt pavement mixture in the first step is a common asphalt mixture or a modified asphalt mixture; the extraction test is a centrifugal separation method; the asphalt recycling test is a rotary evaporator method or an Abelsen method.
3. A method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: the capacity of the container in the second step is 500ml; the quality of the original regenerant is 20-50 g; the heat preservation temperature is 120-160 ℃; the heat preservation time is 120-240 min.
4. A method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: the concentration range of the solution with different mass concentrations in the third step is 0% -50%; the number of the solutions with different mass concentrations is not less than 5 groups; the heating condition is not more than 160 ℃; the viscosity at 60 ℃ is the viscosity eta at 60 ℃ tested by a T0619 test method in JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure.
5. A method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: fitting in the fourth step, wherein an exponential function based on a natural constant is adopted for fitting, the mass concentration is an independent variable during fitting, the viscosity at 60 ℃ is a dependent variable, and the requirement of fitting correlation coefficient is that the absolute value is not lower than 0.99; the fitting parameters are a and b values in the following formula:
y＝a×e bx
wherein: y is the fitting dependent variable: viscosity at 60 ℃ of mm 2 /s；
x is the fitting argument: aged bitumen mass concentration,%;
e is a natural constant;
a and b are natural fitting parameters.
6. A method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: the container in the fifth step is a container consistent with the specification type in the second step; the mass of the poured aged asphalt is 3-20 g; the heating temperature is as follows: the old asphalt pavement is 140-160 ℃ when the old asphalt pavement is of a common asphalt mixture type, and the old asphalt pavement is 160-180 ℃ when the old asphalt pavement is of a modified asphalt mixture type; the heating time is 10-30 min.
7. A method of evaluating the compatibility of a rejuvenating agent with aged asphalt according to claim 1, wherein: the mass of the original sample regenerant in the step six is 20-50 g; the heat preservation temperature and the heat preservation time are consistent with the heat preservation conditions in the second step.
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