CN117010220A - Determination method for optimal asphalt dosage of steel slag asphalt mixture - Google Patents

Determination method for optimal asphalt dosage of steel slag asphalt mixture Download PDF

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CN117010220A
CN117010220A CN202311288083.4A CN202311288083A CN117010220A CN 117010220 A CN117010220 A CN 117010220A CN 202311288083 A CN202311288083 A CN 202311288083A CN 117010220 A CN117010220 A CN 117010220A
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steel slag
asphalt
asphalt mixture
determining
optimal
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CN117010220B (en
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黄毅
贺春宁
肖源杰
吴开
孙剑峰
王宏祥
侯可
沈泽涵
陈宇亮
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Hunan Communications Research Institute Co ltd
Central South University
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Central South University
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Abstract

The application discloses a method for determining the optimal asphalt consumption of a steel slag asphalt mixture, which relates to the technical field of asphalt pavement materials and comprises the following steps: s1, determining the type, performance design index and raw materials of the steel slag asphalt mixture according to key parameters; s2, grading design of the steel slag asphalt mixture is carried out; s3, according to the steel slag specification required by the grading design of the steel slag asphalt mixture in S2, carrying out three-dimensional scanning on the corresponding steel slag single particles to determine the open porosity of the steel slagThe method comprises the steps of carrying out a first treatment on the surface of the S4, calculating the mass ratio of asphalt absorbed by steel slag open pores to mineral aggregateThe method comprises the steps of carrying out a first treatment on the surface of the S5, calculating the mass ratio of asphalt to mineral aggregate corresponding to the thickness of the expected asphalt filmThe method comprises the steps of carrying out a first treatment on the surface of the S6, determining the optimal asphalt dosage based on a performance balance design methodThe method comprises the steps of carrying out a first treatment on the surface of the The application provides a more scientific and accurate proportioning design method of a steel slag asphalt mixture, which effectively solves the problem that the Marshall design method is not suitable for pavement diseases such as water damage caused by the steel slag mixture.

Description

Determination method for optimal asphalt dosage of steel slag asphalt mixture
Technical Field
The application relates to the technical field of asphalt pavement materials, in particular to a method for determining the optimal asphalt consumption of a steel slag asphalt mixture.
Background
The optimal asphalt dosage of the asphalt mixture plays a key role in the road performance and durability of the mixture, and the essence of the asphalt mixture is that the road performance of the mixture in all aspects under the condition of optimal asphalt film thickness is balanced and optimal. When the actual asphalt dosage is higher than the optimal asphalt dosage, an excessive thick asphalt film and an excessive free asphalt ratio can appear, and at the moment, under the action of vehicle load, relative sliding is very easy to occur between aggregates, so that diseases such as rutting, oil bleeding and the like are caused. When the actual asphalt dosage is lower than the optimal asphalt dosage, the asphalt film is too thin, even part of aggregate is not completely wrapped by asphalt, at the moment, under the action of dynamic water pressure, the asphalt film is very easy to peel off the surface of the aggregate, so that the pavement is damaged by water and other diseases.
The steel slag is used as a byproduct of steelmaking, has the characteristics of porosity, firmness, wear resistance, small needle-shaped content and the like, and can replace basalt, diabase and other natural aggregates to be used in asphalt pavement construction. The resource utilization of the steel slag can effectively reduce mining, save a large amount of natural resources and has remarkable social and economic benefits.
The Marshall design method is the most commonly used design method in China at present, and can be used for determining the grading of asphalt mixture and the optimal asphalt dosage, but due to the characteristics of steel slag, the traditional Marshall design method cannot be well applied to the steel slag asphalt mixture, so that the volume index of the steel slag asphalt mixture determined by the Marshall design method has poor correlation with the road performances such as water stability, high-temperature stability and low-temperature crack resistance of the mixture.
Based on this, it is necessary to propose a method for determining the optimum asphalt content of a steel slag asphalt mixture to solve or at least alleviate the above-mentioned drawbacks.
Disclosure of Invention
The application mainly aims to provide a method for determining the optimal asphalt dosage of a steel slag asphalt mixture, and aims to solve the technical problems that the existing Marshall design method does not relate the possible damage types of the mixture to the mixture design, so that the subsequent steel slag mixture is easy to generate pavement diseases such as water damage in the use process.
In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
a method for determining the optimal asphalt dosage of a steel slag asphalt mixture comprises the following steps:
s1, determining the type, performance design index and raw materials of the steel slag asphalt mixture according to key parameters;
s2, grading design of the steel slag asphalt mixture is carried out;
s3, according to S2The steel slag specification required by the grading design of the steel slag asphalt mixture is characterized in that the corresponding steel slag single particles are subjected to three-dimensional scanning to determine the open porosity of the steel slag；
S4, calculating the mass ratio of asphalt absorbed by steel slag open pores to mineral aggregate；
S5, calculating the mass ratio of asphalt to mineral aggregate corresponding to the thickness of the expected asphalt film；
S6, determining the optimal asphalt dosage based on a performance balance design method。
Preferably, the key parameters in step S1 include traffic load level, climate zone and application horizon of the road.
Preferably, the determining step of the step S1 is as follows:
s10, determining the type and the raw materials of the steel slag asphalt mixture according to the traffic load grade, the climate zone and the application horizon of a road used by the steel slag asphalt mixture;
s11, determining performance design indexes according to JTG D50 according to the type and climate zone of the steel slag asphalt mixture.
Preferably, the specific design steps of the step S2 are as follows:
s20, respectively screening the mineral aggregates with different particle size specifications in the raw materials to obtain the corresponding passing percentage of all the mineral aggregates, and recording as，%；
S21, respectively carrying out wool volume density tests on mineral aggregates with different particle size specifications to obtain wool volume relative densities corresponding to all the mineral aggregates, and marking asDimensionless;
s22, respectively obtaining the corresponding design volume percentage of the mineral aggregate according to trial calculation or planning calculation, and marking asThen, the volume passing percentage of the corresponding mineral aggregate on the corresponding sieve holes is calculated according to the objective function I and is recorded as +.>，%，
An objective function I;
s23, converting the volume gradation of the mineral aggregate into quality gradation, and marking the quality gradation asThen, the mass passing percentage of the corresponding mineral aggregate on the corresponding sieve holes is calculated according to the objective functions II and III and is recorded as +.>，%；
An objective function II;
and an objective function III.
Preferably, in the step S3, the porosity of the steel slag opening is determinedThe specific determination steps of (a) are as follows:
s30, respectively selecting a plurality of steel slag with different grain size specifications according to the steel slag with different grain size specifications adopted in the grading design of the steel slag asphalt mixture of S2;
s31, sequentially placing steel slag with different grain sizes on three-dimensional scanning equipment, and performing three-dimensional scanning to obtain corresponding steel slag grain digital images and surface morphology data;
s32, processing the obtained steel slag particle digital image and the surface morphology data to obtain a steel slag real three-dimensional digital model by Geomagic, thereby extracting the corresponding steel slag opening porosity。
Preferably, in step S4, the mass ratio is calculatedThe specific steps of (a) are as follows:
s40, calculating the mass ratio of the open pore absorbed asphalt of the steel slag with different particle size specifications to mineral aggregate according to the objective function IV；
An objective function IV;
wherein,is asphalt relative density, dimensionless, +.>Is->Porosity of open pores on the surface of the medium-specification steel slag,%;
s41, combining an objective function five to calculate the mass ratio of the open pore absorbed asphalt of the steel slag with all particle size specifications to mineral aggregate；
And an objective function five.
Preferably, in the step S5Regarding the determination of the mass ratioThe specific steps of (a) are as follows:
s50, calculating the sum of specific surface areas of the mineral aggregates in unit mass according to the objective function six；
An objective function six;
wherein,surface area coefficient, m of aggregate with various particle sizes 2 /kg；
S51, calculating the proportion of asphalt mass corresponding to the thickness of the expected asphalt film to the total mass of the mineral aggregate by combining the objective function seven；
An objective function seven;
wherein,thickness of asphalt film, m; />Is asphalt density at 25 deg.c, kg/m 3 。
Preferably, the optimal asphalt amount in the step S6Is characterized by comprising the following specific steps:
s60, taking the corresponding oilstone ratio as a first lower limit value and marking as the residual intensity ratio TSR；
S61、To meet the damage strain of the low-temperature bending testThe corresponding whetstone ratio is denoted as +.>；
S62, taking the dynamic stability DS meeting the vehicle color test and the corresponding oil-stone ratio as an upper limit value, and marking as；
S63, substituting the first lower limit value, the second lower limit value and the upper limit value according to the target function eight and the target function nine to obtain the optimal asphalt dosage；
An objective function eight;
the objective function is nine.
Preferably, the method further comprises the following steps:
s7, obtaining the optimal asphalt dosage according to the S6And determining the volume index of the steel slag asphalt mixture, wherein the volume index comprises theoretical maximum relative density, gross volume relative density, test piece void ratio VV, mineral aggregate void ratio VMA and asphalt saturation VFA.
Preferably, the specific determination method of the volume index in the step S7 is as follows:
s70, testing the theoretical maximum relative density of the steel slag asphalt mixture according to an experimental method described by T0711 in JTG E20;
s71, preparing a marshall test piece of the formed steel slag asphalt mixture, and testing the volume relative density of the steel slag asphalt mixture, the void ratio VV of the test piece, the void ratio VMA of mineral aggregate and the asphalt saturation VFA according to a test method in JTG E20.
The application has the following beneficial effects:
(1) And the porosity of the open pores on the steel slag surface is quantitatively represented by adopting a three-dimensional scanning technology, the asphalt dosage absorbed by the open pores on the steel slag surface is accurately obtained, and the initial asphalt dosage of the steel slag asphalt mixture can be objectively and accurately determined by combining the asphalt dosage corresponding to the expected asphalt film thickness.
(2) And carrying out proportioning design on the steel slag asphalt mixture based on the performance design index determined by the key parameters, directly using the performance of the steel slag asphalt mixture to adjust and optimize the mineral aggregate gradation and the asphalt dosage, finding a balance point among the water damage resistance, the high-temperature stability and the low-temperature crack resistance of the steel slag asphalt mixture, and finally determining the optimal asphalt dosage.
(3) The volume grading is converted into quality grading, so that the use in the production stage and the production quality control are facilitated.
In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram of the overall architecture of the determination method of the present application;
FIG. 2 is a schematic flow chart of the present application;
FIG. 3 is a schematic diagram of a three-dimensional blue light scanning system according to the present application;
FIG. 4 is a schematic representation of a three-dimensional model after three-dimensional scanning in accordance with the present application;
FIG. 5 is a graph showing the design volume grading curve and the design quality grading curve of the steel slag asphalt mixture according to the present application
FIG. 6 is a schematic diagram of the composition of asphalt in the steel slag asphalt mixture of the present application;
FIG. 7 is a schematic representation of the determination of the optimal whetstone ratio based on performance metrics in the present application;
FIG. 8 is a cross-sectional view of a trial manufactured article produced without the determination method of the present application;
FIG. 9 is a cross-sectional view of a trial-product prepared by the determination method of the present application.
Detailed Description
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 application.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that all the directional indicators in the embodiments of the present application are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.
It should be understood that the optimum asphalt content of the steel slag asphalt mixture is different from the conventional asphalt mixture in that the optimum asphalt content not only comprises asphalt coated on the surface of the mineral aggregate, but also comprises a steel slag tablePart of asphalt absorbed by the open-faced pores can effectively prevent water from entering the open-faced pores of the steel slag and then entering the steel slagAnd->The active substances react, so that the phenomenon of pavement damage caused by poor stability of steel slag is avoided, and therefore, the part of asphalt which permeates into the open pores on the surface of the steel slag cannot be ignored in the stirring and mixing process of the steel slag asphalt mixture, if the part of asphalt is ignored, the thickness of the asphalt film needs to be reduced, and the performance of the mixture is influenced once the measure is adopted.
Therefore, the amount of asphalt in the steel slag asphalt mixture needs to be scientifically and reasonably determined, and the Marshall design method is adopted by the current domestic common design method and combined with the current specification Asphalt absorption coefficient objective function of mineral aggregate open pore absorption asphalt given in (2)>It is noted, however, that the objective function is only applicable to the water absorption +.>Aggregate in the range of 0.5% -1.7%, while the water absorption of natural aggregate is generally 0.5% -1.0%, so for conventional asphalt mixtures, the method can be applied to the objective function to determine the asphalt absorption coefficient +.>However, for steel slag, the water absorption is generally greater than 1.7% (1.7% -3.0%), so that the water absorption cannot be applied to the objective function, and secondly, due to the porous property of the steel slag, the traditional Marshall design method is used for determining the optimal asphalt consumptionThe asphalt consumption in the unit volume mixture tends to be too small, so that water is easy to enter the steel slag pores, and the volume expansion is caused, and meanwhile, when the asphalt mixture contains two or more aggregates and the density difference among the aggregates is large, the current specification is that> The grading range and the volume index of the mixture cannot meet the actual requirements, and finally, the correlation between the volume index determined by the Marshall design method and the water stability, the high-temperature stability and the low-temperature crack resistance of the mixture is poor, so that the problems of water damage and the like of the pavement are caused easily.
Based on the above problems, the application provides a method for determining the optimal asphalt dosage of a steel slag asphalt mixture, which is shown in fig. 1-2, and comprises the following steps:
s1, determining the type, performance design index and raw materials of the steel slag asphalt mixture according to key parameters, wherein the key parameters comprise traffic load level, climate partition and application horizon of a road, and the raw materials in the embodiment specifically comprise: steel slag, natural aggregate, mineral powder, asphalt and fiber, wherein the asphalt in the mixture is modified asphalt or road petroleum asphalt and the specification label of concrete road petroleum asphalt, in addition, the required data of the steel slag adopted in the mixture is mainly the specification of the grain size of steel slag particles, in addition, the components of the natural aggregate are mainly various rocks, and in actual scenes, limestone is mainly used; secondly, the types of the steel slag asphalt mixture are respectively classified into three types of close grading, half open grading and open grading.
Further, the determining step of the step S1 is as follows:
s10, determining the type and the raw materials of the steel slag asphalt mixture according to the traffic load grade, the climate zone and the application horizon of a road used by the steel slag asphalt mixture;
s11, according to steel slagAsphalt mixture type and climate zone are according to (highway asphalt pavement design specification) determining performance design indexes, wherein the performance design indexes respectively adopt the residual strength ratio of freeze thawing splitting test) The water stability of the mixture was evaluated, the dynamic stability of the rutting test (++>) Evaluation of the high temperature stability of the mixtures, low temperature flexural test failure Strain ()>) The low temperature cracking resistance of the mixture is evaluated, and the high temperature and low temperature expressed herein refer to the fact that the temperature value is equal to or higher than 60 ℃ in a laboratory, preferably equal to or lower than-10 ℃ in a laboratory, the high Wen Shuzhi is 60 ℃ and the low temperature value is-10 ℃, more specifically, the performance indexes of dynamic stability and damage strain are determined according to the climate zone where the asphalt mixture is used, and the dynamic stability and damage strain obtained by conversion in the laboratory are compared with each other, so that whether the actual requirement is met or not is not according with the concept of 'high temperature and low temperature' in a non-conventional sense.
S2, grading design of the steel slag asphalt mixture is carried out;
s3, according to the steel slag specification required by the grading design of the steel slag asphalt mixture in S2, carrying out three-dimensional scanning on the corresponding steel slag single particles to determine the open porosity of the steel slag；
S4, calculating the mass ratio of asphalt absorbed by steel slag open pores to mineral aggregate；
S5, calculating the mass ratio of asphalt to mineral aggregate corresponding to the thickness of the expected asphalt film；
S6, determining the optimal asphalt dosage based on a performance balance design method。
The optimal asphalt dosage is finally determined through the steps S1-S6 in the applicationThe advantages are as follows:
(1) The three-dimensional scanning technology is adopted to quantitatively represent the porosity of the open pores on the surface of the steel slagThe method is convenient for accurately determining the initial asphalt dosage of the steel slag asphalt mixture by combining the asphalt dosage which is absorbed by the open pores on the surface of the steel slag and the asphalt dosage which corresponds to the expected asphalt film thickness;
(2) The method is characterized in that the mixing proportion design is carried out on the steel slag asphalt mixture based on key parameters of the using area, namely traffic load level, climate partition and performance index determined by application layer, the traditional volume design is skipped, the steel slag asphalt mixture performance is directly used for adjusting and optimizing mineral aggregate gradation and asphalt consumption, and balance points are found among the water damage resistance, high-temperature stability and low-temperature crack resistance of the steel slag asphalt mixture, so that the problem that the conventional Marshall design cannot be well applied to the steel slag asphalt mixture is solved, and meanwhile, the current situation that the volume index of the steel slag asphalt mixture is greatly influenced by factors such as steel slag density, blending proportion and the like in the specification is solved, and the volume index of the steel slag asphalt mixture is lost.
In determining the optimal asphalt dosage, as described in connection with FIG. 2Before, it is necessary to test its performance index, if it is in conformity with the testAnd determining the optimal asphalt dosage, otherwise, readjusting the grading design and the oil-stone ratio to ensure the accuracy of the method.
Furthermore, the specific design steps of the step S2 are as follows: it is to be understood that the mineral aggregates of different particle size specifications used in the raw materials are marked as，/>=1, 2,3, …, whereas the type of sieve mesh used in the screening test is marked as，/>=1, 2,3 …; based on this, the specific operation steps of this step S2 will be understood again: s20, respectively screening the mineral aggregates with different particle size specifications in the raw materials to obtain the corresponding passing percentage of all the mineral aggregates, and marking the passing percentage as +.>，%；
S21, respectively carrying out wool volume density tests on mineral aggregates with different particle size specifications to obtain wool volume relative densities corresponding to all the mineral aggregates, and marking asDimensionless;
s22, respectively obtaining the corresponding design volume percentage of the mineral aggregate according to trial calculation or planning calculation, and marking asThen, the volume passing percentage of the corresponding mineral aggregate on the corresponding sieve holes is calculated according to the objective function I and is recorded as +.>(in%) it is noted that +.>Needs to meet the technical specification of road asphalt construction (/ -for)> ) Or the upper and lower limit ranges of the target gradation mentioned in the actual design file;
an objective function I;
s23, converting the volume gradation of the mineral aggregate into quality gradation, and marking the quality gradation as(in%) of the following; weighing mineral aggregate in the production stage conveniently, and then obtaining the mass passing percentage of the corresponding mineral aggregate on the corresponding sieve holes according to the objective functions II and III, and marking as +.>，%；
An objective function II;
and an objective function III.
The appropriate mesh size is determined with reference to the designed volume grading curve and designed quality grading curve of the steel slag asphalt mixture in the present example shown in fig. 5.
According to the step S2, the volume gradation conversion of the mineral aggregate consisting of the steel slag and the natural aggregate in the table 1 can be obtained into the quality gradation
The volume design method is adopted to carry out grading design on the mixture, and then the volume grading is converted into quality grading, so that the stirring production stage is convenient to use and the production quality is convenient to control.
Further, the step S3 is related to the open porosity of the steel slagThe specific determination steps of (a) are as follows:
s30, respectively selecting a plurality of steel slag with different grain size specifications according to the steel slag with different grain size specifications adopted in the grading design of the steel slag asphalt mixture of S2;
s31, sequentially placing steel slag with different grain sizes on three-dimensional scanning equipment, and performing three-dimensional scanning to obtain corresponding steel slag grain digital images and surface morphology data;
s32, processing the obtained steel slag particle digital image and the surface morphology data to obtain a steel slag real three-dimensional digital model by Geomagic, thereby extracting the corresponding steel slag opening porosity。
As can be seen from fig. 3 and fig. 4, in the practical application scenario, that is, the actual operation steps of those skilled in the art are:
step 1), adjusting laser beams emitted by an instrument to align the laser beams with a turntable with marking points, determining the relative position of the turntable and the instrument, and calibrating the measurement precision of the instrument;
step 2), respectively selecting a plurality of steel slag particles with each particle size specification, wherein in the embodiment, the number of the steel slag particles is 20, uniformly placing the steel slag with the same particle size specification on a rotary table, adjusting an instrument to enable a laser beam to be aligned to the surface of the particles, and calculating the relative distance between the surface of the particles and the instrument through reflection of the laser beam by the surface of the particles;
step 3), acquiring digital images and surface morphology data of steel slag particles under different angles through the rotation angle of the surface turntable and the incidence angle of the laser beam;
step 4), utilizeThe software performs fitting alignment, combination and splicing on the steel slag particle surface morphology data acquired under different angles, and performs noise reduction treatment, so as to further acquire +.>A real three-dimensional digital model of steel slag stored in a format;
step 5), deriving the volume of the scanned steel slag modelWherein->The serial number of the steel slag particles is represented, the open pore of the surface of the model is extracted for local analysis, and the open pore volume of the corresponding model surface is determined>Calculating the porosities of open pores on the surfaces of steel slag particles with different particle size specifications>。
Further, in the step S4, the mass ratio of the asphalt absorbed by the open pores of the steel slag particles to the mineral aggregate is obtainedThe specific steps of (a) are as follows:
s40, calculating the mass ratio of the open pore absorbed asphalt of the steel slag with different particle size specifications to mineral aggregate according to the objective function IV；
An objective function IV;
wherein,is asphalt relative density, dimensionless, +.>Is->Porosity of open pores on the surface of the medium-specification steel slag,%;
s41, combining an objective function five to calculate the mass ratio of the open pore absorbed asphalt of the steel slag with all particle size specifications to mineral aggregate；
And an objective function five.
Further, in step S5, a mass ratio is determinedThe specific steps of (a) are as follows:
s50, calculating the sum of specific surface areas of the mineral aggregates in unit mass according to the objective function six；
An objective function six;
wherein,surface area coefficient, m of aggregate with various particle sizes 2 /kg; in a practical scenario, the specific surface area coefficient of the aggregate in combination with Table 2
Wherein the surface area coefficient of the aggregate is greater than 4.75mm in mineral aggregate gradingAll take 0.0041->In calculating the specific surface area of this type of aggregate, the specific surface area of the aggregate larger than 4.75mm is calculated only once, and only the maximum particle diameter corresponding portion is calculated.
S51, calculating the proportion of asphalt mass corresponding to the thickness of the expected asphalt film to the total mass of the mineral aggregate by combining the objective function seven；
An objective function seven;
wherein,thickness of asphalt film, +.>For asphalt mixture with void fraction of 3% -6% for asphalt density at 25 ℃, said asphalt film thickness +.>Get->The method comprises the steps of carrying out a first treatment on the surface of the For the asphalt mixture with the void ratio of 6% -12%, the thickness of the asphalt film is +.>Get->The method comprises the steps of carrying out a first treatment on the surface of the For the asphalt mixture with the void ratio of 18% -25%, the thickness of the asphalt film is +.>Get->。
For a person skilled in the artIn other words, the initial oil-stone ratio is also calculatedReferring to FIG. 6, it can be seen that the so-called initial oilstone ratio +.>It is composed of two parts, namely, the asphalt filling the steel slag opening pore accounts for the mass proportion of mineral aggregate>Asphalt to mineral aggregate mass ratio corresponding to the desired asphalt film thickness +.>The specific calculation mode is as follows: />。
For the concrete application example, the mass ratio of the asphalt absorbed by the open pores of the steel slag with the thickness of 9.5-13.2 mm and the steel slag with the thickness of 4.75-9.5 mm to the respective mineral aggregate is calculatedCalculating to obtain->And->0.59% and 0.65%, respectively;
obtaining the mass ratio of the open pore absorbed asphalt of the steel slag with all grain size specifications to mineral aggregate by combining an objective function five
；
Combining the objective function six to obtain the sum of specific surface areas of the mineral aggregates in unit mass4.72->Specific calculation process can refer to the sum of specific surface areas of slag asphalt mixture mineral aggregates in Table 3>Computing an example; meanwhile, when the thickness of asphalt film of steel slag asphalt mixture is +.>Get->，/>The density of the modified asphalt is->The ratio of the asphalt mass corresponding to the expected asphalt film thickness to the total mass of the mineral aggregate can be obtained by combining the objective function seven>；
Thus, the initial oil-stone ratio is finally obtained。
Further, the optimal asphalt amount in the step S6Is characterized by comprising the following specific steps:
s60, taking the corresponding oilstone ratio as a first lower limit value and marking as the residual intensity ratio TSR；
S61, to meet the damage strain of the low-temperature bending testIts correspondent oilstone ratioA second lower limit value, denoted asThe method comprises the steps of carrying out a first treatment on the surface of the It will be appreciated that the oil ratio here, i.e. the initial oil-stone ratio expressed above +.>；
S62, taking the dynamic stability DS meeting the vehicle color test and the corresponding oil-stone ratio as an upper limit value, and marking as；
S63, substituting the first lower limit value, the second lower limit value and the upper limit value according to the target function eight and the target function nine to obtain the optimal asphalt dosage；
An objective function eight;
the objective function is nine.
To further understand this step, a practical example is illustrated in connection with FIG. 7, where 5 sets of petroleum ratios are selected, respectively、/>、/>、/>、/>Steel slag asphalt mixture test piece formed under the condition;
reference toMiddle->、/>And->The test method of the expression is that a freeze thawing splitting test, a rutting test and a low Wen Xiaoliang bending test are respectively carried out on 5 groups of steel slag asphalt mixture test pieces, wherein the test temperature of the low Wen Xiaoliang bending test is-10 ℃, and the loading rate is ∈ ->；
Secondly, the residual intensity ratio is satisfied) And low temperature bending test failure strain (>) The corresponding whetstone ratios are respectively defined as first lower values +.>And a second lower limit value->To meet the dynamic stability of the rut test (/ -)>) As an upper limit value of the whetstone ratio->；
Finally, combining the objective function eight and the objective function nine to respectively obtain the optimal oil-stone ratioOptimum drainingGreen dosage->。
Furthermore, in order to facilitate quality control in the production stage, the volume index is easier to test and obtain relative to the high-temperature low-temperature water stability index, and the required test equipment is simple; on the other hand in order to interface with the current standard. In order to verify each volume index of the mixture at the optimal asphalt dosage, the method further comprises the following steps:
s7, obtaining the optimal asphalt dosage according to the S6And determining the volume index of the steel slag asphalt mixture, wherein the volume index comprises theoretical maximum relative density, gross volume relative density, test piece void ratio VV, mineral aggregate void ratio VMA and asphalt saturation VFA.
The specific determination method of the volume index in the step S7 is as follows:
s70 according toThe experimental method described in the middle T0711 tests the theoretical maximum relative density of the steel slag asphalt mixture;
s71, preparing a marshall test piece of the formed steel slag asphalt mixture, and testing the volume relative density of the steel slag asphalt mixture, the void ratio VV of the test piece, the void ratio VMA of mineral aggregate and the asphalt saturation VFA according to a test method in JTG E20.
In a practical scenario, for example: the volume index of the steel slag asphalt mixture AC-13C is shown in Table 4:
furthermore, in order to verify the superiority of the method of the present application, the cross-sectional views of the test piece designed by the conventional design method and the test piece obtained by the design method of the present application are compared, as shown in fig. 8-9, and the cross-section of the test piece obtained by the conventional method has significantly more pores.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. The method for determining the optimal asphalt consumption of the steel slag asphalt mixture is characterized by comprising the following steps:
s1, determining the type, performance design index and raw materials of the steel slag asphalt mixture according to key parameters;
s2, grading design of the steel slag asphalt mixture is carried out;
s3, according to the steel slag specification required by the grading design of the steel slag asphalt mixture in S2, carrying out three-dimensional scanning on the corresponding steel slag single particles to determine the open porosity of the steel slag；
S4, calculating the mass ratio of asphalt absorbed by steel slag open pores to mineral aggregate；
S5, calculating the mass ratio of asphalt to mineral aggregate corresponding to the thickness of the expected asphalt film；
S6, determining the optimal asphalt dosage based on a performance balance design method。
2. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 1, wherein the key parameters in the step S1 include the traffic load level, the climate zone and the application horizon of the road.
3. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 2, wherein the determining step in the step S1 is as follows:
s10, determining the type and the raw materials of the steel slag asphalt mixture according to the traffic load grade, the climate zone and the application horizon of a road used by the steel slag asphalt mixture;
s11, determining performance design indexes according to JTG D50 according to the type and climate zone of the steel slag asphalt mixture.
4. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 1, wherein the specific design step of the step S2 is as follows:
s20, respectively screening the mineral aggregates with different particle size specifications in the raw materials to obtain the corresponding passing percentage of all the mineral aggregates, and recording as，%；
S21, respectively carrying out wool volume density tests on mineral aggregates with different particle size specifications to obtain wool volume relative densities corresponding to all the mineral aggregates, and marking asDimensionless;
s22, respectively obtaining the corresponding design volume percentage of the mineral aggregate according to trial calculation or planning calculation, and marking asThen, the volume passing percentage of the corresponding mineral aggregate on the corresponding sieve holes is calculated according to the objective function I and is recorded as +.>，%，
An objective function I;
s23, converting the volume gradation of the mineral aggregate into quality gradation, and marking the quality gradation as(in%) of the following; then, the mass passing percentage of the corresponding mineral aggregate on the corresponding sieve holes is calculated according to the objective functions II and III and is recorded as +.>，%；
An objective function II;
and an objective function III.
5. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 1, wherein the step S3 is about the open porosity of the steel slagThe specific determination steps of (a) are as follows:
s30, respectively selecting a plurality of steel slag with different grain size specifications according to the steel slag with different grain size specifications adopted in the grading design of the steel slag asphalt mixture of S2;
s31, sequentially placing steel slag with different grain sizes on three-dimensional scanning equipment, and performing three-dimensional scanning to obtain corresponding steel slag grain digital images and surface morphology data;
s32, processing the obtained steel slag particle digital image and the surface morphology data to obtain a steel slag real three-dimensional digital model by Geomagic, thereby extracting the corresponding steel slag opening porosity。
6. The method for determining the optimal asphalt content of a steel slag asphalt mixture according to claim 5, wherein the step S4 is for obtaining the mass ratioThe specific steps of (a) are as follows:
s40, calculating the mass ratio of the open pore absorbed asphalt of the steel slag with different particle size specifications to mineral aggregate according to the objective function IV；
An objective function IV;
wherein,is asphalt relative density, dimensionless, +.>Is->Porosity of open pores on the surface of the medium-specification steel slag,%;
s41, combining an objective function five to calculate the mass ratio of the open pore absorbed asphalt of the steel slag with all particle size specifications to mineral aggregate；
And an objective function five.
7. The method for determining the optimal asphalt content of steel slag asphalt mixture according to claim 6, which is characterized in thatCharacterized in that in the step S5, the mass ratio is calculatedThe specific steps of (a) are as follows:
s50, calculating the sum of specific surface areas of the mineral aggregates in unit mass according to the objective function six；
An objective function six;
wherein,surface area coefficient, m of aggregate with various particle sizes 2 /kg；
S51, calculating the proportion of asphalt mass corresponding to the thickness of the expected asphalt film to the total mass of the mineral aggregate by combining the objective function seven；
An objective function seven;
wherein,thickness of asphalt film, m; />Is asphalt density at 25 deg.c, kg/m 3 。
8. The method for determining the optimal asphalt content of steel slag asphalt mixture according to claim 7, wherein the optimal asphalt content in step S6Is characterized by comprising the following specific steps:
s60, taking the corresponding oilstone ratio as a first lower limit value and marking as the residual intensity ratio TSR；
S61, to meet the damage strain of the low-temperature bending testThe corresponding whetstone ratio is denoted as +.>；
S62, taking the dynamic stability DS meeting the vehicle color test and the corresponding oil-stone ratio as an upper limit value, and marking as；
S63, substituting the first lower limit value, the second lower limit value and the upper limit value according to the target function eight and the target function nine to obtain the optimal asphalt dosage；
An objective function eight;
the objective function is nine.
9. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 1, further comprising the steps of:
s7, obtaining the optimal asphalt dosage according to the S6And determining the volume index of the steel slag asphalt mixture, wherein the volume index comprises theoretical maximum relative density, gross volume relative density, test piece void ratio VV, mineral aggregate void ratio VMA and asphalt saturation VFA.
10. The method for determining the optimal asphalt content of the steel slag asphalt mixture according to claim 9, wherein the specific method for determining the volume index in the step S7 is as follows:
s70, testing the theoretical maximum relative density of the steel slag asphalt mixture according to an experimental method described by T0711 in JTG E20;
s71, preparing a marshall test piece of the formed steel slag asphalt mixture, and testing the volume relative density of the steel slag asphalt mixture, the void ratio VV of the test piece, the void ratio VMA of mineral aggregate and the asphalt saturation VFA according to a test method in JTG E20.
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