CN112213473B - Method for measuring asphalt aging index - Google Patents
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- CN112213473B CN112213473B CN202010919320.2A CN202010919320A CN112213473B CN 112213473 B CN112213473 B CN 112213473B CN 202010919320 A CN202010919320 A CN 202010919320A CN 112213473 B CN112213473 B CN 112213473B
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Abstract
The invention discloses a method for measuring asphalt aging indexes, which comprises the steps of aging production asphalt to obtain aged asphalt, adding the aged asphalt into the production asphalt in different proportions to obtain mixed asphalt, preparing an asphalt mixture by using the mixed asphalt, and measuring the splitting tensile strength and the breaking tensile strain of the asphalt mixture; and then, calculating an asphalt aging index A by adopting the addition amount of the aged asphalt and a curve with an inflection point of the tensile strain failure member and according to the addition amount of the inflection point, the splitting tensile strength value and the tensile strain failure value. The determination method provided by the invention directly takes the asphalt mixture as a matrix for testing, can truly and objectively reflect the influence of the asphalt aging degree on the low-temperature crack resistance of the asphalt mixture, and has positive significance for judging the asphalt quality and guiding the field production.
Description
Technical Field
The invention relates to the technical field of asphalt detection, in particular to a method for measuring an asphalt aging index.
Background
Along with the development of economic society of China, the demand of people on traffic is gradually increased, and China builds a large number of asphalt pavements in recent years. Many problems are exposed along with the massive construction of asphalt pavements. Generally speaking, a newly built asphalt pavement cracks after passing through a vehicle for 4-5 years due to the problems of asphalt aging, driving load and the like. In recent years, a large number of cracks are generated on part of highway pavements in the second winter after the highway pavements are built, one crack can be generated along the driving direction by about 5-8 m, and investigation shows that the reason for generating the cracks prematurely is that the asphalt is stored for too long time in the construction process, and the heating temperature is too high in the mixing process, so that the asphalt is aged prematurely, the crack resistance of the asphalt pavement is insufficient, and the cracks are generated prematurely.
At present, the national standard only stipulates the indexes of ductility, penetration ratio, softening point and the like of the aged asphalt, and only can test the index of the aged asphalt; and the test index is the performance of the asphalt, and the asphalt mixture cannot be directly tested, so that the mismatching with the actual situation on site is caused. On one hand, in the actual production process, the aging degree of the used asphalt is different due to the limitation of field conditions, and the aging condition of the actually used asphalt is unreasonable only by adopting the index of aging index; on the other hand, if comprehensive tests such as penetration ratio, ductility, viscosity, softening point and the like are adopted, the test procedure is troublesome, and the trends of these changes are often different, which makes it difficult to judge, and it is difficult to directly and objectively reflect the degree of aging of asphalt, and thus it is difficult to apply the asphalt to on-site production.
Disclosure of Invention
The invention aims to solve the technical problem that the invention provides a method for measuring the asphalt aging index, which is simple and can be well suitable for field production; meanwhile, the method can effectively evaluate the aging degree of the asphalt, give direct and objective quantitative indexes and provide basis for judging the performance of the asphalt and guiding the production of asphalt mixtures.
In order to solve the technical problem, the invention provides a method for measuring an asphalt aging index, which comprises the following steps:
(1) taking production asphalt, and aging the production asphalt to obtain aged asphalt;
(2) adding different amounts of the aged asphalt into the production asphalt to obtain a plurality of groups of mixed asphalt; wherein, in the mixed asphalt of the i group, the addition amount of the aged asphalt is ni；
(3) Mixing the mixed asphalt with aggregate and filler according to a preset proportion to obtain a plurality of groups of asphalt mixtures;
(4) preparing the asphalt mixture into a cylindrical test piece;
(5) determining the splitting tensile strength R of the cylindrical test pieceTiAnd breaking tensile strain εTi；
(6) Constructing a curve with an inflection point by using the breaking tensile strain under the condition of different addition amounts of aged asphalt, and taking an asphalt addition value n closest to the inflection pointkSplitting tensile strength value RTkAnd a value of tensile strain to failure ∈Tk；
(7) The aging index of the production asphalt is calculated according to the following formula group:
A＝ΔεT-lgΔRT
wherein A is the aging index of the asphalt;
△εTfor breaking the rate of change of tensile strain in the general descending phase, εTtThe breaking tensile strain of the cylindrical test piece is determined when the addition amount of the aged asphalt in the mixed asphalt is 100%;
△RTthe rate of change of the tensile strength of the cleavage in the normal reduction stage, RTtWhen the addition amount of the aged asphalt in the mixed asphalt is 100%, the splitting tensile strength of the cylindrical test piece is high.
In step (5), the method in T0716 in JTG E20-2011 is used to determine the tensile strength at break and the breaking strain of the cylindrical test piece.
As an improvement of the technical scheme, in the step (1), the production asphalt is spread into a film with the thickness of 2-5 mm, and then aging is carried out at 150-180 ℃ and under normal pressure for 0.5-5 h; or
Paving the production asphalt into a film with the thickness of 2-5 mm, and then aging at 80-110 ℃ under the pressure of 2-2.5 MPa for 18-28 h.
As an improvement of the technical scheme, in the step (1), the production asphalt is aged according to the method of T0610 in JTG E20-2011.
As an improvement of the technical scheme, in the step (2), the addition amount of the aged asphalt is different in different groups of mixed asphalt; the addition amount of the aged asphalt is in an increasing trend.
As an improvement of the above technical solution, in the step (2), n isiThe values of (A) are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% in sequence.
As an improvement of the above technical scheme, in the step (3), the asphalt mixture mainly comprises the following raw materials in parts by weight:
2-5 parts of mixed asphalt, 90-98 parts of aggregate and 0-5 parts of filler.
As an improvement of the technical scheme, the asphalt mixture is a cold-mix asphalt mixture or a hot-mix asphalt mixture.
As an improvement of the above technical solution, in step (4), a cylindrical test piece is prepared according to the method in T0702 in JTG E20-2011.
The implementation of the invention has the following beneficial effects:
aging production asphalt to obtain aged asphalt, adding the aged asphalt into the production asphalt in different proportions to obtain mixed asphalt, preparing an asphalt mixture by using the mixed asphalt, and measuring the splitting tensile strength and the breaking tensile strain of the asphalt mixture; and then, adopting the addition amount of the aged asphalt and the breaking tensile strain to construct a curve with an inflection point, and calculating an asphalt aging index A through the addition amount of the inflection point, the splitting tensile strength value and the breaking tensile strain value. The determination method provided by the invention directly takes the asphalt mixture as a matrix for testing, can truly and objectively reflect the influence of the asphalt aging degree on the low-temperature crack resistance of the asphalt mixture, and has positive significance for judging the asphalt quality and guiding the field production. Meanwhile, the determination method is simple and direct, and can be well suitable for field production.
Drawings
FIG. 1 is a flow chart of a method for determining an asphalt aging index according to the present invention;
FIG. 2 is a graph of tensile strain to failure for various aged asphalts in example 1 of the present invention.
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 accompanying drawings.
Referring to fig. 1, the invention provides a method for measuring an asphalt aging index, which comprises the following steps:
s1: aging production asphalt to obtain aged asphalt;
specifically, the production asphalt can be spread into a film with the thickness of 2-5 mm, and then aging is carried out at 150-180 ℃ and normal pressure for 0.5-5 h; or
Paving the production asphalt into a film with the thickness of 2-5 mm, and then aging at 80-110 ℃ under the pressure of 2-2.5 MPa for 18-28 h.
Preferably, the production asphalt is aged by a method of T0610 in road engineering asphalt and asphalt mixture test protocol (JTG E20-2011); specifically, the aging condition is 163 +/-0.5 ℃ and the aging time is 85 min.
S2: adding aged asphalt into production asphalt to obtain mixed asphalt;
specifically, the production asphalt and the aged asphalt are heated to 90-120 ℃, then mixed, stirred for 5-15 minutes, and then sheared for 30-50 minutes at a speed of 3000-6000 r/min by a high-speed shearing machine, so that the mixed asphalt is obtained. Under the mixing condition, the aged asphalt and the production asphalt are fully mixed, and the obtained mixed asphalt has uniform performance, so that the performances of the mixed asphalt and the aged asphalt are well reflected.
The addition amount of the aged asphalt in different groups of mixed asphalt is different, and the aged asphalt presents an increasing trend, and specifically, the addition amount can be in a gradient increasing manner, a linear increasing manner or an exponential increasing manner, and the like, but is not limited to the above.
Preferably, the addition amount n of the aged asphalt in the mixed asphaltiThe values of (A) are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% in sequence.
S3: mixing the mixed asphalt with aggregate and filler according to a preset proportion to obtain an asphalt mixture;
specifically, the asphalt mixture is a cold-mix asphalt mixture or a hot-mix asphalt mixture. Preferably, the hot-mixing asphalt mixture is selected, and further, the hot-mixing temperature is controlled to be 95-140 ℃.
Specifically, the invention has no special requirements on the composition of the asphalt mixture, and the technical personnel in the field can determine the composition according to the actual application condition; or the mixture ratio of the asphalt mixture is carried out according to the relevant regulations in technical Specification for constructing asphalt pavements for roads (JTG F40-2017).
Preferably, in the invention, the asphalt mixture mainly comprises the following raw materials in parts by weight: 2-5 parts of mixed asphalt, 90-98 parts of aggregate and 0-5 parts of filler.
S4: preparing a cylindrical test piece from the asphalt mixture;
specifically, a cylindrical test piece is prepared according to a method in T0702 in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011).
S5: measuring the splitting tensile strength and the breaking tensile strain of the cylindrical test piece;
specifically, the splitting tensile strength R of each group of cylindrical test pieces is measured according to a method (measuring temperature of-10 +/-0.5 ℃) in T0716 in road engineering asphalt and asphalt mixture test specification (JTG E20-2011)TiAnd breaking tensile strain εTi。
S6: constructing a curve with an inflection point according to the breaking tensile strain under the condition of different addition amounts of the aged asphalt, and taking an asphalt addition value, a splitting tensile strength value and a breaking tensile strain value which are closest to the inflection point;
specifically, the addition amount n of the aged asphaltiAs abscissa, to break the tensile strain εTiAs a vertical coordinate, constructing a curve by using the breaking tensile strain under the condition of different addition amounts of aged asphalt, and acquiring the inflection point of the curve and the asphalt addition amount value n closest to the inflection pointkSplitting tensile strength value RTkAnd a value of tensile strain to failure ∈Tk。
The construction method of the curve comprises the following steps: adding n of aged asphaltiAs independent variable to break the tensile strain εTiIs a dependent variable; and fitting the multiple groups of corresponding data by adopting an exponential function with a natural constant e as a base, making a trend line, and writing an equation and an error test value to obtain a curve. Wherein, the exponential function can adopt y ═ y0+Ae-x/tOr
(y0、t、t1、t2All are constants), but are not so limited.
S7: calculating the aging index of the asphalt for production;
specifically, the aging index of the asphalt for production is calculated according to the following formula group:
A＝ΔεT+lgΔRT
wherein A is the aging index of the asphalt;
△εTfor breaking the rate of change of tensile strain in the general descending phase, εTtThe breaking tensile strain of the cylindrical test piece is determined when the addition amount of the aged asphalt in the mixed asphalt is 100%;
△RTthe rate of change of the tensile strength of the cleavage in the normal reduction stage, RTtWhen the addition amount of the aged asphalt in the mixed asphalt is 100%, the splitting tensile strength of the cylindrical test piece is high.
The inventor discovers that in the process of asphalt aging research: after the same asphalt is aged under the same aging condition, the change trends of various performances (penetration degree, softening point and ductility) of the same asphalt are not necessarily the same; after different kinds of asphalt are aged under the same aging condition, the change trends of the same performance index (penetration degree, softening point and ductility) may be different. Thus, it is often difficult to effectively evaluate the effects of asphalt aging with existing index systems. Further, the inventors found through extensive studies that the influence of asphalt aging on the low temperature performance of asphalt tends to be consistent: namely, with the increase of the aging degree of the asphalt, the low-temperature performance of the asphalt mixture tends to decrease sharply and then gradually. Based on this study, the inventors have devised a method for measuring the above-described aging index. The method provided by the invention can truly and objectively reflect the influence of the asphalt aging degree on the low-temperature crack resistance of the asphalt mixture, and has positive significance for judging the asphalt quality and guiding the field production.
Correspondingly, the invention also provides application of the method for measuring the asphalt aging index. In particular, the method relates to the application in the preparation of asphalt mixtures, and also relates to the application in the determination and evaluation of asphalt properties.
The invention is further illustrated by the following specific examples:
example 1
The embodiment provides a method for measuring an asphalt aging index, which comprises the following steps:
step 1: aging production asphalt according to a test method of road engineering asphalt and asphalt mixture test protocol (JTG E20-2011) T0610 to obtain aged asphalt;
step 2: replacing production asphalt with aged asphalt in the proportion of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% to form mixed asphalt;
and step 3: preparing AC-25 type hot-mix asphalt mixture from mixed asphalt with different aging degrees according to technical Specifications for road asphalt pavement construction (JTG F40-2017);
and 4, step 4: forming a cylindrical test piece by using asphalt mixtures with different aging degrees according to a test method of road engineering asphalt and asphalt mixture test specification (JTG E20-2011) T0702;
and 5: performing asphalt mixture low-temperature splitting test according to test method of road engineering asphalt and asphalt mixture test regulation (JTG E20-2011) T0716, and determining splitting tensile strength R of cylinder test pieces with different aging degreesTiAnd breaking tensile strain εTi；
The specific values are as follows:
| ni/％ | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| εTi | 15208 | 13986 | 12604 | 11215 | 9987 | 9390 | 9096 | 8801 | 8650 | 8505 | 8358 |
| RTi/MPa | 4.738 | 4.193 | 3.674 | 3.135 | 2.655 | 2.232 | 2.094 | 1.913 | 1.751 | 1.668 | 1.609 |
step 6: adding n of aged asphaltiAs abscissa, breaking tensile strain εTiPlotting the ordinate, and adding an exponential function trend line, a formula and an error value, wherein the result is shown in FIG. 2;
as can be seen from FIG. 2, when the addition amount is 50%, the decreasing tendency of breaking tensile strain becomes gentle, unlike the addition amount of < 50%. Thus, n is selected650% is the inflection point.
Step 6: calculating an aging index;
the specific calculation table is as follows:
| nk | εTk | RTk/MPa | △εT | △RT | A |
| 50％ | 9096 | 2.094 | 20.64 | 0.0125 | 18.74 |
example 2
The embodiment discloses the application of a method for measuring the asphalt aging index;
specifically, two kinds of asphalt, which are numbered AS1 and AS2, are aged according to a test method of road engineering asphalt and asphalt mixture test specification (JTG E20-2011) T0610, then ductility and penetration ratio tests are carried out, and a sample with the same gradation and oilstone ratio AS those in example 1 is adopted to carry out a low-temperature bending test according to a test method of road engineering asphalt and asphalt mixture test specification (JTG E20-2011) T0716, so that the splitting tensile strength and the breaking tensile strain are obtained; the following table specifically shows:
according to the traditional indexes, the ratio of the residual ductility to the penetration of the AS2 asphalt is larger than the correlation index of the AS1 asphalt. It can be concluded that: the AS2 asphalt has better ageing resistance. AS1 asphalt and AS2 asphalt did not differ significantly with respect to low temperature crack resistance.
The results of the measurements carried out according to the method of example 1 of the invention are given in the following table:
as can be seen from the table, the aging index A of AS1 asphalt is 8.90, which is less than 9.67 of AS2 asphalt; thus, aging has a weaker effect on the low temperature crack resistance of AS1 asphalt. Therefore, AS1 asphalt was selected AS the asphalt for construction.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method for measuring asphalt aging indexes is characterized by comprising the following steps:
(1) taking production asphalt, and aging the production asphalt to obtain aged asphalt;
(2) adding different amounts of the aged asphalt into the production asphalt to obtain a plurality of groups of mixed asphalt; wherein, in the mixed asphalt of the i group, the addition amount of the aged asphalt is ni；
(3) Mixing the mixed asphalt with aggregate and filler according to a preset proportion to obtain a plurality of groups of asphalt mixtures;
(4) preparing the asphalt mixture into a cylindrical test piece;
(5) the determination of the tensile strength at break R of the cylindrical test piece was carried out according to the method in T0716 in JTG E20-2011TiAnd breaking tensile strain εTi；
(6) Constructing a curve with an inflection point by using the breaking tensile strain under the condition of different addition amounts of aged asphalt, and taking an asphalt addition value n closest to the inflection pointkSplitting tensile strength value RTkAnd a value of tensile strain to failure ∈Tk；
(7) The aging index of the production asphalt is calculated according to the following formula group:
A＝ΔεT+lgΔRT
wherein A is the aging index of the asphalt;
△εTfor breaking the rate of change of tensile strain in the general descending phase, εTtThe breaking tensile strain of the cylindrical test piece is determined when the addition amount of the aged asphalt in the mixed asphalt is 100%;
△RTthe rate of change of the tensile strength of the cleavage in the normal reduction stage, RTtWhen the addition amount of the aged asphalt in the mixed asphalt is 100%, the splitting tensile strength of the cylindrical test piece is high.
2. The method for measuring the asphalt aging index as claimed in claim 1, wherein in the step (1), the asphalt for production is spread into a film with the thickness of 2-5 mm, and then aging is carried out at 150-180 ℃ and under normal pressure for 0.5-5 h; or
Paving the production asphalt into a film with the thickness of 2-5 mm, and then aging at 80-110 ℃ under the pressure of 2-2.5 MPa for 18-28 h.
3. The method for determining an index of asphalt deterioration according to claim 1 or 2, wherein in the step (1), the process asphalt is aged according to the method of T0610 in JTG E20-2011.
4. The method for measuring an asphalt aging index according to claim 1, wherein in the step (2), the addition amount of the aged asphalt is different among different groups of the mixed asphalt; the addition amount of the aged asphalt is in an increasing trend.
5. The method for measuring an asphalt deterioration index according to claim 1 or 4, wherein in the step (2), the n isiThe values of (A) are 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% in sequence.
6. The method for measuring the asphalt aging index as set forth in claim 1, wherein in the step (3), the asphalt mixture mainly comprises the following raw materials in parts by weight:
2-5 parts of mixed asphalt, 90-98 parts of aggregate and 0-5 parts of filler.
7. The method for measuring the asphalt aging index according to claim 1, wherein the asphalt mixture is a cold-mix asphalt mixture or a hot-mix asphalt mixture.
8. The method for measuring the asphalt aging index according to claim 1, wherein in the step (4), a cylindrical test piece is prepared according to the method in T0702 in JTG E20-2011.
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| CN111548057A (en) * | 2020-06-08 | 2020-08-18 | 四川省公路规划勘察设计研究院有限公司 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
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| CN102735824A (en) * | 2012-06-20 | 2012-10-17 | 江苏山水建设集团有限公司 | Asphalt mixture aging test method |
| CN111548057A (en) * | 2020-06-08 | 2020-08-18 | 四川省公路规划勘察设计研究院有限公司 | Mix proportion design method of plant-mixed hot recycled asphalt mixture |
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