CN116337692A - Method for measuring normal-temperature diffusion index of asphalt regenerant - Google Patents
Method for measuring normal-temperature diffusion index of asphalt regenerant Download PDFInfo
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Abstract
The application relates to a method for measuring normal-temperature diffusion index of asphalt regenerant, which relates to the technical field of asphalt material performance detection and comprises the following steps: performing a reproducibility penetration test on the same mixed sample under a plurality of groups of preset time to obtain penetration values of the mixed sample under the plurality of groups of preset time, wherein the mixed sample is formed by mixing an aged asphalt sample and a regenerant; and calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, and acquiring the diffusion index of the regenerant based on the diffusion depth and the diffusion rate of the regenerant. According to the method, the diffusion index of the regenerant can be obtained by using one mixed sample to perform experiments in a divided manner, so that the diffusion capacity of the regenerant at normal temperature can be analyzed according to the diffusion index of the regenerant, and further a favorable basis can be provided for evaluating the performance of the regenerant for asphalt cold regeneration operation.
Description
Technical Field
The application relates to the technical field of asphalt material performance detection, in particular to a method for measuring an asphalt regenerant normal-temperature diffusion index.
Background
Along with the major part of roads in China entering the major-minor repair stage, a large amount of waste asphalt mixtures can be caused when asphalt pavements are repaired, and the reasonable treatment of the mixtures not only can obtain good economic benefits, but also can save a large amount of resources. The regeneration technology of old asphalt mixture is a technology of re-mixing old asphalt mixture with new aggregate and new asphalt in a certain proportion and paving the mixture to meet the service performance of pavement.
After the old asphalt mixture is used for a long time, asphalt is seriously aged, and the prior experience shows that the water stability and the low-temperature stability of the regenerated asphalt mixture formed by mixing the old asphalt mixture, the new aggregate and the new asphalt are poor, and the asphalt regenerant is required to change and restore the performance of the regenerated asphalt mixture, so that the recycled asphalt mixture can show excellent pavement performance. The asphalt regenerant is contacted with the aged asphalt and is dispersed under the action of mechanical stirring, the asphalt regenerant and the aged asphalt are macroscopically uniform, but the asphalt regenerant and the aged asphalt are still in a separated state, the regenerant gradually diffuses into the aged asphalt along with the time extension and the environmental change, and finally a uniform and stable blend is formed, so that the permeability of the regenerant in the aged asphalt mixture is a key index for evaluating the quality of the regenerant. In the application process of the asphalt pavement regenerant technology, two methods of thermal regeneration and cold regeneration are generally included, and for the thermal regeneration, the regenerant and asphalt are in a flowing state at high temperature, and certain compatibility exists after mechanical mixing; for cold regeneration, the regenerant needs to diffuse and be compatible with aged asphalt in a certain time to achieve the regeneration effect. The diffusion index of the regenerant is a statistical index of the diffusion depth of the regenerant in aged asphalt, which changes with time, and the use performance of the regenerant can be intuitively reflected by the diffusion index of the regenerant.
Although a great deal of researches are carried out on students and research institutions at home and abroad aiming at the old asphalt mixture recycling technology, a certain dispute still exists on the service performance of the recycling agent, and the engineering application success rate of the old asphalt mixture recycling technology is still lower than that of the new asphalt mixture. Regenerants have had good diffusivity as one of their key functional requirements at the beginning of their development. However, in the current regeneration technology, no feasible method for evaluating the diffusion capability of the regenerant is always found, and a certain blindness is caused to the knowledge of the interaction between the regenerant and aged asphalt and the selection of the regenerant, so that the correct design and use of the performance of the regenerated asphalt mixture are affected, the national requirements on energy conservation and emission reduction are higher and higher, cold regeneration is necessary to replace hot regeneration, and a simple and feasible detection and evaluation method is urgently needed for the normal-temperature diffusion capability of the regenerant.
Disclosure of Invention
In order to detect the diffusion capacity of the regenerant in aged asphalt at normal temperature, the application provides a method for measuring the normal-temperature diffusion index of the regenerant.
The application provides a method for measuring the normal-temperature diffusion index of an asphalt regenerant, which adopts the following technical scheme:
a method for determining the normal temperature diffusion index of an asphalt recycling agent, comprising the following steps:
carrying out constant temperature treatment on the mixed sample, wherein the temperature interval of the constant temperature treatment is 5-60 ℃, and the mixed sample is formed by mixing an aged asphalt sample and a regenerant;
weighing the whole mass of the mixed samples and the sample containing dishes under a plurality of groups of preset time, and performing a reproducibility penetration test on the mixed samples to obtain penetration values of the mixed samples under the plurality of groups of preset time;
and calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, and acquiring the diffusion index of the regenerant based on the diffusion depth and the diffusion rate of the regenerant.
By adopting the technical scheme, the mixed sample can be subjected to constant temperature treatment in the interval process without penetration test, and the mixed sample is placed at the temperature of 5-60 ℃ to provide the mixed sample with the health condition simulating the room temperature, so that the diffusion performance of the regenerant in the using process in the room temperature state is reduced, and the performance of the regenerant for asphalt cold regeneration operation can be more accurately judged.
By adopting the technical scheme, the diffusivity index of the regenerant changing with time can also be obtained by performing penetration test in batches by using one mixed sample. When a plurality of mixed samples are used for transverse comparison test, the mixing proportion of the aged asphalt and the regenerant in each mixed sample cannot be guaranteed to be identical, and the contact area of the aged asphalt and the regenerant is identical, so that even under the transverse comparison test under the same condition, the penetration performance of the regenerant in the aged asphalt in each mixed sample is still different, the reliability of data is further influenced, and the diffusion performance of the regenerant cannot be accurately judged.
Specifically, the penetration value of the mixed sample under a plurality of groups of preset time can be obtained by carrying out a reproducibility penetration test on the same mixed sample under a plurality of groups of preset time; the penetration value of the mixed sample under the preset time can be used for calculating the diffusion depth and the diffusion rate of the regenerant under the corresponding preset time, so that the statistical index of the diffusion depth of the regenerant changing along with the time, namely the diffusion index of the regenerant, can be obtained, and the trend of the diffusion depth of the regenerant changing along with the time can be obtained, and the diffusion performance of the regenerant can be judged.
Optionally, before performing the reproducibility penetration test on the same mixed sample under multiple groups of preset times, the method comprises the following steps:
adding the aged asphalt sample into a sample container, weighing the whole mass of the aged asphalt sample and the sample container, and measuring the initial penetration value of the aged asphalt sample;
adding a quantitative regenerant into the sample container to form a mixed sample, and weighing the mixed sample and the whole mass of the sample container in an initial state;
the method for performing the reproducibility penetration test on the same mixed sample under a plurality of groups of preset time comprises the following steps:
weighing the whole mass of the mixed sample and the sample vessel under a plurality of groups of preset time, and performing a reproducibility penetration test on the mixed sample;
before calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, the method further comprises the following steps:
calculating the depth of the regenerant in the sample holder at the preset time based on the total mass of the aged asphalt sample and the sample holder, the total mass of the mixed sample and the sample holder at the initial state and the total mass of the mixed sample and the sample holder at the preset time; the method for calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time comprises the following steps:
and calculating the diffusion depth of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, the depth of the regenerant in the sample container under the preset time and the initial penetration value of the aged asphalt sample, and calculating the diffusion rate of the regenerant under the preset time based on the diffusion depth of the regenerant under the preset time.
By adopting the technical scheme, the volume change of the regenerant can be calculated by measuring the overall mass change of the mixed sample, so that the depth of the regenerant in the sample container at corresponding time can be calculated, the influence of the volume change of the regenerant on a test result in a test process can be reduced, and the accuracy of data is further improved; meanwhile, the regenerant can be prevented from being stripped from the surface of the aged asphalt when the penetration test is carried out, so that the convenience of operation is improved, and the influence on the accuracy of measured data possibly caused by stripping of the regenerant is avoided.
When the penetration test is carried out in the traditional method, the penetration value of the aged asphalt is required to be measured, so that the regenerant is required to be stripped from the surface of the aged asphalt, but the regenerant cannot be completely stripped from the aged asphalt in the stripping process and is easy to influence the surface of the asphalt, so that the accuracy of data is easy to influence.
Most regenerants have the characteristic of being volatile, so that the regenerants are easy to volatilize in the test process to cause the volume change of the regenerants, the accuracy of the test data is affected, in each penetration test, a measuring needle is contacted with the regenerant during measurement, the regenerant is possibly lost, and the volume change of the regenerant is easy to cause, so that the accuracy of the test data is affected; by adopting the technical scheme, the whole mass of the aged asphalt sample and the sample holder can be weighed in an initial state, the whole mass of the mixed sample and the sample holder in the initial state can be weighed before each penetration test, and the whole mass of the mixed sample and the sample holder in the corresponding preset time can be weighed, so that the depth of the regenerant in the sample holder in the corresponding preset time can be calculated through the whole mass of the aged asphalt sample and the sample holder, the whole mass of the mixed sample and the sample holder in the initial state and the whole mass of the mixed sample and the sample holder in the corresponding preset time; therefore, the diffusion depth of the regenerant in the corresponding preset time can be obtained by subtracting the depth of the regenerant in the sample container in the corresponding preset time from the penetration value of the mixed sample in the preset time obtained by each penetration test and the initial penetration value of the aged asphalt sample, and the diffusion rate of the regenerant in the corresponding preset time can be calculated.
Alternatively, when n7, the interval time of two adjacent sets of reproductivity penetration tests is 2-3 days; when n7, the interval time of two adjacent groups of reproductivity penetration tests is 3-5 days, wherein n is the corresponding test days.
By adopting the technical scheme, the trend of the diffusion performance of the regenerant along with the time change can be reflected more accurately, so that the diffusion capability of the regenerant can be evaluated more accurately; when the regenerant is in contact with aged asphalt, the diffusion speed of the regenerant is higher at the beginning, and the diffusion speed of the regenerant gradually becomes slower along with the change of time, so that the diffusion performance of the regenerant in seven days can be better reflected by setting the interval time of two adjacent penetration tests to be 2-3 days in seven days; by setting the interval time between two adjacent penetration tests to be 3-5 days after seven days, the diffusion performance of the regenerant after seven days can be reflected relatively well, so that the test efficiency is improved, and the law of the change of the diffusion performance of the regenerant along with time can be reflected better.
Optionally, the mixed sample has a number of reproductions penetration tests of not less than 5.
By adopting the technical scheme, the trend of the diffusion performance of the regenerant along with the time change can be reflected more accurately, so that the diffusion capability of the regenerant can be judged more accurately, and a large number of actual tests show that the law of the diffusion performance of the regenerant along with the time change can be reflected better only by 5 times of tests.
Optionally, the method for calculating the diffusivity of the regenerant comprises the following steps:
D n d is the diffusion depth of the regenerant at the preset time m The diffusion depth of the regenerant obtained from the previous test on day n.
By adopting the technical scheme, the ratio of the diffusion depth of the regenerant on the nth day to the diffusion depth of the regenerant on the previous test can be calculated, so that the diffusion speed (slope) of the regenerant on the nth day can be reflected, and a basis is provided for judging the diffusion performance of the regenerant.
Optionally, the method for calculating the diffusion depth of the regenerant comprises the following steps:
D n ＝D 1dn -D 3dn -D 0
wherein D is 1dn For the penetration value of the mixed sample under the preset time, D 3dn D, for the depth of the regenerant in the sample vessel at the preset time 0 Is the initial penetration value of the aged asphalt sample.
By adopting the technical scheme, the diffusion depth of the regenerant on the nth day can be calculated, so that the rule of the diffusion depth of the regenerant changing along with time can be obtained, and a basis is further provided for judging the diffusion performance of the regenerant; meanwhile, data support is provided for calculating the diffusivity of the regenerant.
Optionally, the method for calculating the depth of the regenerant in the sample vessel in the preset time comprises the following steps:
wherein V is 1 V for the initial volume of the regenerant 3dn And d is the diameter of the sample vessel, which is the volume change value of the regenerant after the preset time.
By adopting the technical scheme, the depth of the regenerant in the sample container at the nth day can be calculated, so that data support is provided for calculating the diffusion depth of the regenerant at the nth day.
Optionally, the method for calculating the volume change value of the regenerant after the preset time is as follows:
wherein m is 2 For the total mass of the mixed sample and the sample vessel in the initial state, m dn For the total mass of the mixed sample and the cuvette at the preset time, ρ is the density of the regenerant.
By adopting the technical scheme, the volume change value of the regenerant after n days can be calculated, and data support is provided for calculating the depth of the regenerant in the sample container on the nth day.
Optionally, the method for calculating the initial volume of the regenerant comprises the following steps:
wherein m is 3 Is the initial mass of the regenerant.
By adopting the technical scheme, the initial volume of the regenerant can be calculated, so that data support is provided for calculating the volume change value of the regenerant after n days.
Optionally, the method for calculating the initial mass of the regenerant comprises the following steps:
m 3 ＝m 2 -m 1
wherein m is 1 For the total mass of the aged asphalt samples and dishes.
By adopting the technical scheme, the initial mass of the regenerant can be calculated, and data support is provided for calculating the initial volume of the regenerant.
In summary, the present application includes at least one of the following beneficial technical effects:
1. by carrying out constant temperature treatment on the mixed sample, the mixed sample can be provided with a health condition simulating room temperature, so that the diffusion performance of the regenerant in the using process at normal temperature is reduced, and further, a favorable basis can be provided for the performance evaluation of the regenerant for asphalt cold regeneration operation;
2. the penetration test is carried out in a plurality of times at a specific time by using one mixed sample, so that the diffusion performance index of the regenerant changing along with time can be obtained, thereby providing a favorable basis for judging the diffusion performance of the regenerant, and improving the defects that the penetration performance of the regenerant in the aged asphalt is still different in each mixed sample and the reliability of test data is influenced because the mixing proportion of the regenerant and the aged asphalt in each mixed sample is not ensured to be identical and the contact area of the aged asphalt and the regenerant in each mixed sample is not ensured to be identical when the mixed samples are used for carrying out the transverse comparison test under the same condition;
3. the volume change of the regenerant in the mixed sample can be calculated by measuring the overall mass change of the mixed sample, so that the depth of the regenerant in the sample container at corresponding time can be calculated, and further, when the diffusion depth of the regenerant is calculated, the influence of the volume change of the regenerant on the data result of a test is avoided by subtracting the depth data of the regenerant at corresponding time, and the accuracy of the test data is improved; meanwhile, the regenerant can be prevented from being stripped from the surface of the aged asphalt when the penetration test is carried out, so that the convenience of operation is improved, and the influence on the accuracy of measured data possibly caused by stripping of the regenerant is avoided; 4. by specifying the number of tests of the penetration test and the interval time between two adjacent penetration tests, the trend of the diffusion performance of the regenerant over time can be reflected more accurately, thereby facilitating more accurate judgment of the diffusion performance of the regenerant.
Drawings
FIG. 1 is a schematic flow chart of a method for determining the normal temperature diffusion index of an asphalt recycling agent;
FIG. 2 is a graph of the diffusion index of regenerant 1 provided in example 1 of the present application;
FIG. 3 is a graph showing the diffusivity of regenerant 1 as provided in example 1 of the present application;
FIG. 4 is a graph of the diffusion index of regenerant 2 provided in example 2 of the present application;
FIG. 5 is a graph of diffusivity of regenerant 2 as provided in example 2 of the present application;
FIG. 6 is a graph of the diffusion index of regenerant 3 provided in example 3 of the present application;
FIG. 7 is a graph of diffusivity of regenerant 3 as provided in example 3 of the present application;
FIG. 8 is a graph comparing diffusion indexes of regenerants 1, 2 and 3 provided in the examples of the present application;
fig. 9 is a graph showing the diffusivity of regenerant 1, regenerant 2 and regenerant 3 according to an embodiment of the present application.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-2.
The application discloses a method for measuring normal temperature diffusion index of asphalt regenerant, which is based on the following principle:
adding an aged asphalt sample into a sample container to provide a simulated asphalt surface, and then adding a quantitative regenerant to uniformly cover the surface of the aged asphalt sample, so as to simulate an interaction contact interface between the regenerant and the aged asphalt; under certain test conditions, the regenerant can continuously diffuse into the aged asphalt along with the time increase, and the larger the diffusion and content of the regenerant is, the stronger the diffusion capability is, and the faster the penetration rate obtained by the test is reflected on the test index.
Referring to fig. 1, a method for determining an asphalt recycling agent normal temperature diffusion index includes the steps of:
s1, preparing: a fixed amount of aged asphalt sample and a fixed amount of regenerant are prepared, and the regenerant and aged asphalt sample are mixed in a sample vessel.
S101, preparing aged asphalt: recovering aged asphalt from regenerated asphalt mixture (RAP) according to method T0726 or T0727 in Highway engineering asphalt and asphalt mixture test procedure (JTG E20), preparing aged asphalt sample according to method T0602 in Highway engineering asphalt and asphalt mixture test procedure (JTG E20), adding aged asphalt sample into sample container, covering the top of sample container with sample container cover after aged asphalt is cooled, weighing the whole mass of aged asphalt sample and sample container, and recording as m 1 (g, four digits after the decimal point).
The sample container is made of metal or hard glass, has a flat bottom and a cylindrical shape, has an inner diameter of 55 mm+/-1 mm and a depth of 35 mm+/-1 mm, can be replaced by a clean penetration test, and has the advantages that before an aged asphalt sample is added, the inner diameter of the sample container is measured and recorded as d (cm, four positions after decimal point) at first; the sample container cover is used for reducing the influence of the volatilization of the regenerant on the test; when the whole mass of the aged asphalt sample and the sample vessel is weighed, a ten-thousandth analytical balance with the sensing quantity not more than 0.1mg is adopted so as to ensure the weighing precision.
S102, initial penetration measurement: after weighing the whole mass of the aged asphalt sample and the sample vessel, measuring only the sample vesselInitial penetration value of the dish with aged asphalt, noted as D 0 (mm, two digits after the decimal point).
S103, preparing a regenerant: weighing and quantifying the required regenerant (3-5 g), and recording the initial mass of the regenerant, which is denoted as m 3 (g, four positions after the decimal point is accurately reached), adding the prepared quantitative regenerant into a sample container, covering the sample container, weighing the whole mass of the aged asphalt sample, the sample container and the regenerant in the initial state, and marking as m 2 (g, four digits after the decimal point).
Wherein, when weighing the whole mass of the aged asphalt sample, the regenerant and the sample vessel, a ten-thousandth analytical balance with the sensing quantity not more than 0.1mg is adopted to ensure the weighing precision.
S2, heat preservation work: placing the sample containing vessel containing the mixed sample of the aged asphalt and the regenerant in a constant temperature and humidity box at 15-25 ℃ for preserving, taking the sample containing vessel containing the mixed sample of the aged asphalt and the regenerant out of the constant temperature and humidity box at 15-25 ℃ for penetration test under the preset specific time, and placing the sample containing vessel containing the mixed sample of the aged asphalt and the regenerant in the constant temperature and humidity box again after the test.
S3, test work: performing repeated penetration tests on the mixed sample containing the aged asphalt and the regenerant for a plurality of groups of preset time, and measuring penetration values of the mixed sample at corresponding time; when the preset time is less than seven days, the interval time between two adjacent groups of preset times is 2-3 days, and when the preset time is more than seven days, the interval time between two adjacent groups of preset times is 3-5 days, and the number of the penetration tests is not less than 5.
In this example, penetration tests were performed on the mixed samples containing aged asphalt and regenerant on the first, third, fifth, seventh, tenth, thirteenth, sixteenth, twenty-first, twenty-sixth and thirty-first days, respectively.
S301, weighing before the test: taking out the sample container containing the mixed sample of the aged asphalt and the regenerant from the constant temperature and humidity box, and weighing the aged asphalt, the regenerant and the regenerantThe overall mass of the sample vessel is recorded as m dn (g, four digits after the decimal point, n is the number of days).
Wherein, when weighing the whole mass of the aged asphalt sample, the regenerant and the sample vessel, a ten-thousandth analytical balance with the sensing quantity not more than 0.1mg is adopted to ensure the weighing precision.
S302, penetration test: after weighing the whole mass of the aged asphalt sample, the regenerant and the sample holding vessel on the nth day, opening the sample holding vessel cover, placing the sample holding vessel containing the mixed sample of the aged asphalt and the regenerant on a platform of a full-automatic penetrometer, starting the instrument to measure the penetration value of the mixed sample of the aged asphalt and the regenerant, and marking as D 1dn (mm, two digits after the decimal point, n is the number of days).
When the penetration is measured, parallel tests are carried out for at least 3 times on corresponding days, the distance between the test points is not less than 10mm from the edge of the sample container, and the loss of aged asphalt and regenerant samples is reduced as much as possible in the test process; when the penetration test result is less than 50 (0.1 mm), the allowable error of the repeatability test is 2 (0.1 mm), and the allowable error of the reproducibility test is 4 (0.1 mm); when the penetration test result is greater than or equal to 50 (0.1 mm), the allowable error of the repeatability test is 4% of the average value, and the allowable error of the reproducibility test is 8% of the average value.
S303, resetting after the test: after the penetration of the mixed sample of the aged asphalt and the regenerant is measured for a corresponding number of days, the sample vessel containing the mixed sample of the aged asphalt and the regenerant is still placed in a constant temperature and humidity box with corresponding temperature, and the test is continuously carried out according to the steps after the corresponding number of days.
S4, calculating: calculating the diffusion depth D of the regenerant according to the result of the penetration test n (mm, two digits after the decimal point, n is the corresponding number of days) and diffusivity K n (%) and n is the number of days.
S401, calculating diffusion depth D of regenerant n (mm, two digits after the decimal point, n is the corresponding number of days):
first, an initial volume V of the regenerant is calculated 1 (cm 3 )，V 1 The calculation method of (1) is as follows:
wherein m is 3 (g) For the initial mass of the regenerant ρ (g/cm 3 ) Is the density of the regenerant at the test temperature;
in the second step, the volume change of the regenerant was calculated for the corresponding days and recorded as V 3dn (cm 3 )，V 3dn The calculation method of (1) is as follows:
(wherein n is the number of days, ρ (g/cm) 3 ) For the density of the regenerant at the test temperature, m dn (g) For the overall mass of the aged asphalt, regenerant and dishes on day n, m 2 (g) Is the overall mass of the aged asphalt, regenerant and sample vessel in the initial state);
third, calculating the depth of regenerant in the sample vessel when the corresponding days are calculated, and marking the depth as D 3dn (mm)，D 3dn The calculation method of (1) is as follows:
(wherein n is the number of days, V 1 (cm 3 ) Is the volume of the regenerant in the initial state, V 3dn (cm 3 ) The volume change value of the regenerant on the nth day, d (mm) is the diameter of the sample vessel;
fourth, calculate the diffusion depth D of the regenerant n (mm),D n The calculation method of (C) is D n ＝D 1dn -D 3dn -D 0 (wherein D 1dn (mm) penetration value of the mixture sample of the aged asphalt and the regenerant on the nth day, D 3dn (mm) is the depth of regenerant in the cuvette on day n, D 0 (mm) is the initial penetration value of a sample vessel containing aged asphalt alone).
S402, calculating diffusivity K of the regenerant n (%) and n is the number of days corresponding to K n The calculation method of (1) is as follows:
(wherein n is the number of days, D n (mm) diffusion index of regenerant on day n, D m (mm) is the diffusion index of the regenerant obtained from the previous penetration test on day n.
S5, drawing a line graph of the diffusion depth of the regenerant along with the time change according to the diffusion depth data of the regenerant, namely, the diffusion index of the regenerant, and judging the diffusion performance of the regenerant according to the diffusion index of the regenerant and the diffusion rate of the regenerant.
For better verification of a method for determining the room temperature diffusion index of an asphalt recycling agent provided in the present application, the following are part of representative examples of the present application:
example 1: measurement of the diffusion index of regenerant 1.
S1, preparing a quantitative aged asphalt sample and a quantitative regenerant 1, and mixing the regenerant 1 and the aged asphalt sample in a sample container;
s101, recycling aged asphalt from a reclaimed asphalt mixture (RAP) according to a method of T0726 in highway engineering asphalt and asphalt mixture test procedure (JTG E20), preparing an aged asphalt sample according to a method of T0602 in highway engineering asphalt and asphalt mixture test procedure (JTG E20), adding the aged asphalt sample into a sample container, covering the top of the sample container by using a sample container cover after the aged asphalt is cooled, and weighing the aged asphalt sample and the whole mass m of the sample container 1 The diameter of the cuvette was measured d= 5.4400cm, = 62.2017 g;
s102, measuring an initial penetration value D of a sample container only filled with aged asphalt 0 ＝4.21mm；
S103, weighing and quantifying the required regenerant 1, and recording the initial mass m of the regenerant 1 3 3.9828g, adding the prepared quantitative regenerant 1 into a sample vessel, covering the sample vessel, and weighing the whole mass m of the aged asphalt sample, the sample vessel and the regenerant 1 in the initial state 2 ＝66.1845g。
S2, placing a sample container containing the mixed sample of the aged asphalt and the regenerant 1 in a constant temperature and humidity box at 20 ℃ for preserving health.
S3, taking the sample containers containing the mixed samples of the aged asphalt and the regenerant 1 out of a constant temperature and humidity box at 20 ℃ for penetration test on the first day, the third day, the fifth day, the seventh day, the tenth day, the thirteenth day, the sixteenth day, the twenty-first day, the twenty-sixth day and the thirty-first day respectively;
s301, taking out a sample container containing a mixed sample of aged asphalt and a regenerant 1 from a constant temperature and humidity box, firstly weighing the whole masses of the aged asphalt, the regenerant 1 and the sample container, and under the corresponding test days, measuring the data m of the whole masses of the aged asphalt, the regenerant 1 and the sample container d1 、m d3 、m d5 、m d7 、m d10 、m d13 、m d16 、m d21 、m d26 、m d31 ；
S302, opening a sample container cover, placing a sample container containing a mixed sample of aged asphalt and a regenerant 1 on a platform of a full-automatic penetrometer, starting the instrument to measure the penetration value of the mixed sample of the aged asphalt and the regenerant 1, and under the corresponding test days, respectively obtaining the following data of the penetration value of the mixed sample of the aged asphalt and the regenerant 1: d (D) 1d1 、D 1d3 、D 1d5 、D 1d7 、D 1d10 、D 1d13 、D 1d16 、D 1d21 、D 1d26 、D 1d31 。
S4, calculating diffusion depth D n And diffusivity K n
S401, calculating diffusion depth D n ：
First, the initial volume of the regenerant 1 is calculated
Second, the volume change value of the regenerant 1 on the nth day was calculated:
V 3d1 、V 3d3 、V 3d5 、V 3d7 、V 3d10 、V 3d13 、V 3d16 、V 3d21 、V 3d26 、V 3d31 。
third, calculate the depth of regenerant 1 in the dish on day n:
D 3d1 、D 3d3 、D 3d5 、D 3d7 、D 3d10 、D 3d13 、D 3d16 、D 3d21 、D 3d26 、D 3d31 。
fourth, calculate the diffusion depth D of the regenerant 1 n ：
D 1 ＝D 1d1 -D 3d1 -D 0 ＝0.48mm；
D 3 ＝D 1d3 -D 3d3 -D 0 ＝1.02mm；
D 5 ＝D 1d5 -D 3d5 -D 0 ＝1.52mm；
D 7 ＝D 1d7 -D 3d7 -D 0 ＝1.87mm；
D 10 ＝D 1d10 -D 3d10 -D 0 ＝2.19mm；
D 13 ＝D 1d13 -D 3d13 -D 0 ＝2.39mm；
D 16 ＝D 1d16 -D 3d16 -D 0 ＝2.55mm；
D 21 ＝D 1d21 -D 3d21 -D 0 ＝2.68mm；
D 26 ＝D 1d26 -D 3d26 -D 0 ＝2.80mm；
D 31 ＝D 1d31 -D 3d31 -D 0 ＝2.91mm。
S402, calculating diffusivity K of the regenerant 1 on the nth day n ：
S5, a time-varying line graph of the diffusion depth of the regenerant 1, namely, the diffusion index of the regenerant 1 is drawn according to diffusion depth data of the regenerant 1, a time-varying line graph of the diffusion rate of the regenerant 1 is drawn according to the diffusion rate of the regenerant 1, and the diffusion performance of the regenerant 1 is judged according to the diffusion index of the regenerant 1 and the diffusion rate of the regenerant 1, as shown in FIG. 3.
Example 2: measurement of the diffusion index of regenerant 2.
S1, preparing a quantitative aged asphalt sample and a quantitative regenerant 2, and mixing the regenerant 2 and the aged asphalt sample in a sample container;
s101, recycling aged asphalt from a reclaimed asphalt mixture (RAP) according to a method of T0726 in Highway engineering asphalt and asphalt mixture test procedure (JTG E20), preparing an aged asphalt sample according to a method of T0602 in Highway engineering asphalt and asphalt mixture test procedure (JTG E20), adding the aged asphalt sample into a sample container, and using a sample container cover to hold the aged asphalt after coolingThe top of the sample vessel is covered, and the whole mass m of the aged asphalt sample and the sample vessel is weighed 1 The diameter of the cuvette was measured d= 5.4400cm, = 63.7435 g;
s102, measuring an initial penetration value D of a sample container only filled with aged asphalt 0 ＝4.21mm；
S103, weighing and quantifying the required regenerant 2, and recording the initial mass m of the regenerant 2 3 4.0091g, adding the prepared quantitative regenerant 2 into a sample vessel, covering the sample vessel, and weighing the whole mass m of the aged asphalt sample, the sample vessel and the regenerant 2 in the initial state 2 ＝67.7526g。
S2, placing a sample container containing the mixed sample of the aged asphalt and the regenerant 2 in a constant temperature and humidity box at 20 ℃ for preserving health.
S3, taking the sample containers containing the mixed samples of the aged asphalt and the regenerant 2 out of a constant temperature and humidity box at 20 ℃ for penetration test on the first day, the third day, the fifth day, the seventh day, the tenth day, the thirteenth day, the sixteenth day, the twenty-first day, the twenty-sixth day and the thirty-first day respectively;
s301, taking out a sample container containing a mixed sample of aged asphalt and a regenerant 2 from a constant temperature and humidity box, and weighing the whole masses of the aged asphalt, the regenerant 2 and the sample container, wherein under the corresponding days, the data of the whole masses of the aged asphalt, the regenerant 2 and the sample container are respectively as follows: m is m d1 、m d3 、m d5 、m d7 、m d10 、m d13 、m d16 、m d21 、m d26 、m d31 ；
S302, opening a sample container cover, placing a sample container containing a mixed sample of aged asphalt and regenerant 2 on a platform of a full-automatic penetrometer, starting the instrument to measure the penetration value of the mixed sample of the aged asphalt and the regenerant 2, and under the corresponding days, respectively: d (D) 1d1 、D 1d3 、D 1d5 、D 1d7 、D 1d10 、D 1d13 、D 1d16 、D 1d21 、D 1d26 、D 1d31 。
S4, calculating diffusionDepth D n And diffusivity K n
S401, calculating diffusion depth D n ：
First, the initial volume of regenerant 2 is calculated
Second, the volume change value of the regenerant 2 on the nth day was calculated:
V 3d1 、V 3d3 、V 3d5 、V 3d7 、V 3d10 、V 3d13 、V 3d16 、V 3d21 、V 3d26 、V 3d31 。
third, calculate the depth of regenerant 2 in the dish on day n:
D 3d1 、D 3d3 、D 3d5 、D 3d7 、D 3d10 、D 3d13 、D 3d16 、D 3d21 、D 3d26 、D 3d31 。
fourth, calculate the diffusion depth D n ：
D 1 ＝D 1d1 -D 3d1 -D 0 ＝0.39mm；
D 3 ＝D 1d3 -D 3d3 -D 0 ＝1.06mm；
D 5 ＝D 1d5 -D 3d5 -D 0 ＝1.41mm；
D 7 ＝D 1d7 -D 3d7 -D 0 ＝1.72mm；
D 10 ＝D 1d10 -D 3d10 -D 0 ＝2.00mm；
D 13 ＝D 1d13 -D 3d13 -D 0 ＝2.18mm；
D 16 ＝D 1d16 -D 3d16 -D 0 ＝2.30mm；
D 21 ＝D 1d21 -D 3d21 -D 0 ＝2.41mm；
D 26 ＝D 1d26 -D 3d26 -D 0 ＝2.50mm；
D 31 ＝D 1d31 -D 3d31 -D 0 ＝2.59mm。
S402, calculating the diffusivity K on the nth day n ：
S5, a time-varying line graph of the diffusion depth of the regenerant 2, namely, the diffusion index of the regenerant 2 is drawn according to the diffusion depth data of the regenerant 2, a time-varying line graph of the diffusion rate of the regenerant 2 is drawn according to the diffusion rate of the regenerant 2 as shown in fig. 4, and the diffusion performance of the regenerant 2 is judged according to the diffusion index of the regenerant 2 and the diffusion rate of the regenerant 2 as shown in fig. 5.
Example 3: measurement of the diffusion index of regenerant 3.
S1, preparing a quantitative aged asphalt sample and a quantitative regenerant 3, and mixing the regenerant 3 and the aged asphalt sample in a sample container;
s101, recycling aged asphalt from a reclaimed asphalt mixture (RAP) according to a method of T0726 in highway engineering asphalt and asphalt mixture test procedure (JTG E20), preparing an aged asphalt sample according to a method of T0602 in highway engineering asphalt and asphalt mixture test procedure (JTG E20), adding the aged asphalt sample into a sample container, covering the top of the sample container by using a sample container cover after the aged asphalt is cooled, and weighing the aged asphalt sample and the whole mass m of the sample container 1 The diameter of the cuvette was measured d= 5.4400cm, = 61.8483 g;
s102, measuring an initial penetration value D of a sample container only filled with aged asphalt 0 ＝4.21mm；
S103, weighing and quantifying the required regenerant 3, and recording the initial mass m of the regenerant 3 3 4.0162g, adding the prepared quantitative regenerant 3 into a sample vessel, covering the sample vessel, and weighing the whole mass m of the aged asphalt sample, the sample vessel and the regenerant 3 in the initial state 2 ＝65.8645g。
S2, placing a sample container containing the mixed sample of the aged asphalt and the regenerant 3 in a constant temperature and humidity box at 20 ℃ for preserving health.
S3, taking the sample containers containing the mixed samples of the aged asphalt and the regenerant 3 out of a constant temperature and humidity box at 20 ℃ for penetration test on the first day, the third day, the fifth day, the seventh day, the tenth day, the thirteenth day, the sixteenth day, the twenty-first day, the twenty-sixth day and the thirty-first day respectively;
s301, taking out a sample container containing a mixed sample of aged asphalt and a regenerant 3 from a constant temperature and humidity box, firstly weighing the whole masses of the aged asphalt, the regenerant 3 and the sample container, and under the corresponding days, weighing the whole masses of the aged asphalt, the regenerant 3 and the sample containerThe data of the quality are respectively: m is m d1 、m d3 、m d5 、m d7 、m d10 、m d13 、m d16 、m d21 、m d26 、m d31 ；
S302, opening a sample container cover, placing a sample container containing a mixed sample of aged asphalt and regenerant 3 on a platform of a full-automatic penetrometer, starting the instrument to measure the penetration value of the mixed sample of the aged asphalt and the regenerant 3, and under the corresponding days, respectively obtaining the following data of the penetration value of the mixed sample of the aged asphalt and the regenerant 3: d (D) 1d1 、D 1d3 、D 1d5 、D 1d7 、D 1d10 、D 1d13 、D 1d16 、D 1d21 、D 1d26 、D 1d31 。
S4, calculating diffusion depth D n And diffusivity K n
S401, calculating diffusion depth D n ：
First, the initial volume of regenerant 3 is calculated
Second, the volume change value of the regenerant 3 on the nth day was calculated:
V 3d1 、V 3d3 、V 3d5 、V 3d7 、V 3d10 、V 3d13 、V 3d16 、V 3d21 、V 3d26 、V 3d31 。
third, the depth of regenerant 3 in the dish on day n was calculated:
D 3d1 、D 3d3 、D 3d5 、D 3d7 、D 3d10 、D 3d13 、D 3d16 、D 3d21 、D 3d26 、D 3d31 。
fourth, calculate the diffusion depth D n ：
D 1 ＝D 1d1 -D 3d1 -D 0 ＝0.52mm；
D 3 ＝D 1d3 -D 3d3 -D 0 ＝1.17mm；
D 5 ＝D 1d5 -D 3d5 -D 0 ＝1.80mm；
D 7 ＝D 1d7 -D 3d7 -D 0 ＝2.13mm；
D 10 ＝D 1d10 -D 3d10 -D 0 ＝2.37mm；
D 13 ＝D 1d13 -D 3d13 -D 0 ＝2.48mm；
D 16 ＝D 1d16 -D 3d16 -D 0 ＝2.58mm；
D 21 ＝D 1d21 -D 3d21 -D 0 ＝2.69mm；
D 26 ＝D 1d26 -D 3d26 -D 0 ＝2.77mm；
D 31 ＝D 1d31 -D 3d31 -D 0 ＝2.84mm。
S402, calculating the diffusivity K on the nth day n ：
S5, a time-varying line graph of the diffusion depth of the regenerant 3, namely, the diffusion index of the regenerant 3 is drawn according to diffusion depth data of the regenerant 3, a time-varying line graph of the diffusion rate of the regenerant 3 is drawn according to the diffusion rate of the regenerant 3 as shown in fig. 6, and the diffusion performance of the regenerant 3 is judged according to the diffusion index of the regenerant 3 and the diffusion rate of the regenerant 3 as shown in fig. 7.
In summary, the diffusion index pairs of the regenerants 1, 2 and 3 are shown in fig. 8, and the diffusion rates of the regenerants 1, 2 and 3 are shown in fig. 9. As can be seen from fig. 8 and 9, the diffusion depth of the regenerant 3 in the early stage is better, the diffusion rate is faster, and the initial diffusion effect of the regenerant 3 is relatively better; after 10 days, the diffusion depth and diffusion rate of the regenerants 1 and 2 gradually followed the regenerants 3 and exceeded the regenerants 3, so that it can be concluded that the long-term diffusion effect of the regenerants 1 and 2 was relatively good. So that the diffusion performance of the regenerant 1, the regenerant 2 and the regenerant 3 can be comprehensively compared and judged by the detection method as follows:
the regenerant 3 mainly plays a role in softening aged asphalt materials, and the regenerant 1 and the regenerant 2 can continuously diffuse and be compatible in asphalt for a long time besides the initial surface softening effect, so that a better regeneration effect can be achieved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. A method for determining the normal temperature diffusion index of an asphalt recycling agent, comprising the steps of:
carrying out constant temperature treatment on the mixed sample, wherein the temperature interval of the constant temperature treatment is 5-60 ℃, and the mixed sample is formed by mixing an aged asphalt sample and a regenerant;
weighing the whole mass of the mixed samples and the sample containing dishes under a plurality of groups of preset time, and performing a reproducibility penetration test on the mixed samples to obtain penetration values of the mixed samples under the plurality of groups of preset time;
and calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, and acquiring the diffusion index of the regenerant based on the diffusion depth and the diffusion rate of the regenerant.
2. The method for determining the normal temperature diffusion index of asphalt recycling agent according to claim 1, wherein before the same mixed sample is subjected to the reproducibility penetration test under a plurality of groups of preset time, the method comprises the following steps:
adding the aged asphalt sample into a sample container, weighing the whole mass of the aged asphalt sample and the sample container, and measuring the initial penetration value of the aged asphalt sample;
adding a quantitative regenerant into the sample container to form a mixed sample, and weighing the mixed sample and the whole mass of the sample container in an initial state;
the method for performing the reproducibility penetration test on the same mixed sample under a plurality of groups of preset time comprises the following steps:
weighing the whole mass of the mixed sample and the sample vessel under a plurality of groups of preset time, and performing a reproducibility penetration test on the mixed sample;
before calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, the method further comprises the following steps:
calculating the depth of the regenerant in the sample holder at the preset time based on the total mass of the aged asphalt sample and the sample holder, the total mass of the mixed sample and the sample holder at the initial state and the total mass of the mixed sample and the sample holder at the preset time; the method for calculating the diffusion depth and the diffusion rate of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time comprises the following steps:
and calculating the diffusion depth of the regenerant under the preset time based on the penetration value of the mixed sample under the preset time, the depth of the regenerant in the sample container under the preset time and the initial penetration value of the aged asphalt sample, and calculating the diffusion rate of the regenerant under the preset time based on the diffusion depth of the regenerant under the preset time.
3. The method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 2, wherein the interval time of two adjacent sets of reproductivity penetration tests is 2-3 days when n 7; when n7, the interval time of two adjacent groups of reproductivity penetration tests is 3-5 days, wherein n is the corresponding test days.
4. A method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 3, wherein the number of reproductivity penetration tests of said mixed sample is not less than 5.
5. The method for measuring the normal-temperature diffusion index of an asphalt recycling agent according to claim 4, wherein the method for calculating the diffusion rate of the recycling agent is as follows:
wherein D is n D is the diffusion depth of the regenerant at the preset time m The diffusion depth of the regenerant obtained from the previous test on day n.
6. The method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 5, wherein the method for calculating the diffusion depth of the recycling agent is as follows:
D n ＝D 1dn -D 3dn -D 0
wherein D is 1dn For the penetration value of the mixed sample under the preset time, D 3dn D, for the depth of the regenerant in the sample vessel at the preset time 0 Is the initial penetration value of the aged asphalt sample.
7. The method for determining the normal temperature diffusion index of asphalt regenerant according to claim 6, wherein the depth of the regenerant in the sample vessel at the preset time is calculated by the following steps:
wherein V is 1 V for the initial volume of the regenerant 3dn And d is the diameter of the sample vessel, which is the volume change value of the regenerant after the preset time.
8. The method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 7, wherein the method for calculating the volume change value of the recycling agent after the lapse of a preset time is as follows:
wherein m is 2 For the total mass of the mixed sample and the sample vessel in the initial state, m dn For the total mass of the mixed sample and the cuvette at the preset time, ρ is the density of the regenerant.
9. The method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 8, wherein the method for calculating the initial volume of the recycling agent is as follows:
wherein m is 3 Is the initial mass of the regenerant.
10. The method for determining the normal temperature diffusion index of an asphalt recycling agent according to claim 9, wherein the method for calculating the initial mass of the recycling agent is as follows:
m 3 ＝m 2 -m 1
wherein m is 1 For the total mass of the aged asphalt samples and dishes.
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