CN112726331A - Two-stage design method for target mix proportion of asphalt mixture - Google Patents

Two-stage design method for target mix proportion of asphalt mixture Download PDF

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CN112726331A
CN112726331A CN202011583976.8A CN202011583976A CN112726331A CN 112726331 A CN112726331 A CN 112726331A CN 202011583976 A CN202011583976 A CN 202011583976A CN 112726331 A CN112726331 A CN 112726331A
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proportion
asphalt
target
grading
aggregates
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CN112726331B (en
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陈彬
纪伦
郝晟
国又非
周吉森
周舰航
曾晨露
邹勇
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Heilongjiang Longjian Road & Bridge 6th Engineering Co ltd
Harbin Institute of Technology
Longjian Road and Bridge Co Ltd
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Heilongjiang Longjian Road & Bridge 6th Engineering Co ltd
Harbin Institute of Technology
Longjian Road and Bridge Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
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    • E01C19/1068—Supplying or proportioning the ingredients
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
    • E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
    • E01C19/1059—Controlling the operations; Devices solely for supplying or proportioning the ingredients
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    • E01C19/1072—Supplying or proportioning the ingredients the solid ingredients
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Abstract

A two-stage design method for target mix proportion of asphalt mixture relates to a design method for target mix proportion of asphalt mixture. Designing a target mix proportion in a first stage: the method comprises the following steps: selecting raw materials; step two: monitoring and controlling the quality of raw materials; step three: guiding the preparation of materials according to the median mixing ratio of the aggregates; designing the target mix proportion at the second stage: the method comprises the following steps: screening and monitoring the material preparation process; step two: calculating the blending proportion of the synthetic graded mineral aggregate by a trial-matching method; step three: analyzing the volatility of the blending ratio; step four: determining the optimal asphalt dosage and the final target mixing ratio; step five: testing the performance of the mixture; step six: and correcting the proportion and the quantity of subsequent stock preparation. By reducing the fluctuation of the mineral aggregate ratio, the target mixing ratio result can represent the average characteristic of the field material, the waste of the material is reduced, and the performance and the quality of the material are ensured.

Description

Two-stage design method for target mix proportion of asphalt mixture
Technical Field
The invention relates to a method for designing a target mixing ratio of an asphalt mixture, in particular to a two-stage design method for the target mixing ratio of the asphalt mixture, and belongs to the technical field of asphalt pavement engineering.
Background
The design of the target mix proportion of the asphalt mixture is an important link in the construction process of the asphalt pavement, the essence of the design is the design of the composition proportion and the structure of the internal materials of the asphalt mixture, the design achievement of the design needs to prove whether the mixture under the proportion meets the related performance requirements or not, the design achievement is used for guiding the construction, the proportion and the quantity of prepared materials are determined, and the design is an important basis for controlling the construction quality.
In traditional bituminous paving design and work progress, generally only once carry out the design of target mix proportion, mainly divide two kinds of situations: firstly, the material processed by the gravel field is adopted for the mix proportion design, and secondly, the material at the initial stage of the material preparation is adopted for the mix proportion design. The materials in the two cases are respectively in different construction processes and spatial positions, which only represent the actual conditions of each material source field or the initial stage of material preparation, but not represent the whole process of material preparation, nor represent the average state of all the materials in the approach field.
When the target mix proportion is designed, the proportion and the quantity of the prepared materials need to be preliminarily determined according to the mix proportion, and the achievement of the mix proportion design also needs to represent the average composition characteristics of all materials on site. The two situations may cause large average composition deviation with all materials on site, resulting in failure of target mix proportion design, so that the structural composition of the designed asphalt mixture cannot well meet the expected effect, the proportion and the quantity of prepared materials cannot be scientifically determined, excess or waste of the materials is easily caused, meanwhile, the quality of the material source cannot be ensured to meet the requirement, and the mix proportion design result may not meet the specification requirement.
Therefore, a need exists for providing a method for designing a target mix proportion of an asphalt mixture, which can avoid the defects of the traditional target mix proportion design, meet the expected requirements, and ensure the mix proportion to be realized in the engineering.
Disclosure of Invention
The invention aims to provide a two-stage design method for the target mix proportion of an asphalt mixture, which can ensure that the target mix proportion result can represent the average characteristic of a field material by reducing the fluctuation of the mineral aggregate mix proportion, reduce the waste of the material and ensure the performance and the quality of the material.
In order to achieve the purpose, the invention adopts the following technical scheme: a two-stage design method for target mix proportion of asphalt mixture comprises the following steps:
designing a target mix proportion in a first stage:
the method comprises the following steps: selecting raw materials comprising coarse aggregates, fine aggregates, asphalt and mineral powder, wherein the coarse aggregates and the fine aggregates are processed into various specifications according to the requirements of technical Specification for construction of asphalt pavements for road engineering (JTG F40-2004) 4.8.3;
step two: monitoring and controlling the quality of raw materials, namely performing segregation monitoring on a stockpile of coarse and fine aggregates conveyed to the site, performing screening tests on upper, middle and lower layers of the stockpile respectively, drawing a passing rate curve, monitoring the segregation and pollution of the mineral aggregates, and readjusting unqualified materials according to the first step until the maximum difference value of the passing rate curves of the upper, middle and lower layers of the stockpile is not more than 20%;
step three: guiding the preparation of the materials according to the aggregate median mix proportion, determining the synthetic proportion of various mineral aggregates according to the grading range corresponding to the type of the asphalt mixture, trial-matching a required synthetic grading curve close to the median value by adopting a trial algorithm according to the screening grading curve and the grading range of various mineral aggregates, obtaining the composition proportion of various mineral aggregates under the grading curve, and taking the mixing proportion as the proportion of the preparation of various mineral aggregates;
designing the target mix proportion at the second stage:
the method comprises the following steps: screening and monitoring the material preparation process, wherein in the material preparation process, screening and monitoring tests are carried out on the prepared mineral aggregate each time, and screening test data of the prepared material each time are obtained;
step two: calculating the blending proportion of synthetic graded mineral aggregate by a trial-mix method, designing the blending proportion when the prepared material reaches 60-70%, trial-mixing three synthetic graded curves close to an upper limit, a middle value and a lower limit according to a trial-mix algorithm, and respectively obtaining the mineral aggregate blending proportion corresponding to each graded curve;
step three: analyzing the volatility of the blending ratio, namely performing grading synthesis by using the blending ratios close to the upper limit, the middle value and the lower limit of the three groups of mineral aggregates with various specifications in combination with all screening test data obtained by quality control monitoring by adopting a trial algorithm to obtain three groups of grading synthetic curve sets, calculating the variation coefficient of the passing rate of each grade of sieve pore of aggregate synthetic grading, calculating the average variation coefficient of the sieve pore, and analyzing the volatility of the three groups of grading synthetic curve sets to a target curve;
step four: determining the optimal asphalt dosage and the final target mixing proportion, determining the optimal asphalt dosage by adopting an OAC method aiming at the three groups of mixing proportions, and respectively calculating the OAC1And OAC2，OAC1And OAC2The average value of the asphalt mixture is used as the optimal asphalt dosage, the construction and mixture characteristics and the fluctuation of each mixing proportion are integrated, and the final target mixing proportion and the optimal asphalt dosage are determined;
step five: testing the performance of the mixture, namely testing the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture, wherein the target mixing ratio is designed to be qualified if the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture meet the standard requirements, and otherwise, returning to the second step of the second stage to be carried out again;
step six: correcting the proportion and the quantity of subsequent prepared materials, and correcting the proportion and the quantity of the prepared materials for the mineral aggregate needing to be prepared subsequently according to the finally determined mineral aggregate mixing proportion.
Compared with the prior art, the invention has the beneficial effects that: the invention considers the fluctuation of the blending ratio of the materials, effectively ensures that the synthetic blending ratio of the materials can represent the average level of the prepared materials, improves the realizability of the blending ratio design and the effectiveness of the method, takes the blending ratio close to the grading median of various mineral aggregates determined by the first-stage design method as the material preparation ratio, improves the material preparation efficiency, reduces the waste of the materials, combines with quality control, ensures the performance and quality of the field materials in the first-stage design method, carries out segregation monitoring on the material pile, and effectively reduces the problem that the material performance detection of the target blending ratio design can not meet the requirement.
Drawings
FIG. 1 is a flow chart of a two-stage design method of target mix ratios for asphalt mixtures according to the present invention;
FIG. 2 is a data plot of pile segregation monitoring of fine and coarse aggregates in the examples;
FIG. 3 is a data diagram of a set of composition curves for a level near the level median in an embodiment;
fig. 4 is a data graph of the coefficient of variation of the passage rate of each sieve in the near median composite gradation of the examples.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention designs the target mix proportion according to two stages, combines the quality control technique of the field material, ensures the quality control of the incoming material, guides the material preparation process, considers the fluctuation of the synthetic grading, enables the designed target mix proportion to effectively represent the actual condition of the field material, and finally can mix the mixture designed by the target mix proportion, so that the composition of the asphalt mixture, The structure and the performance accord with the expected effect, thereby ensuring the durability and the service life.
Referring to fig. 1, the invention discloses a two-stage design method of target mix proportion of asphalt mixture, comprising the following steps:
designing a target mix proportion in a first stage:
the method comprises the following steps: selecting raw materials comprising coarse aggregates, fine aggregates, asphalt and mineral powder, wherein the coarse aggregates and the fine aggregates are processed into various specifications according to the requirements of technical Specification for construction of asphalt pavements for road engineering (JTG F40-2004) 4.8.3;
step two: monitoring and controlling the quality of raw materials, namely selecting the coarse aggregates, the fine aggregates, the mineral powder and asphalt as raw materials, and meeting the requirements of technical Specifications for asphalt pavement construction in Highway engineering (JTG F40-2004), carrying out segregation monitoring on stockpiles of the coarse and fine aggregates conveyed to the site, respectively taking upper, middle and lower layers of the stockpiles for screening tests, drawing a passing rate curve, monitoring the segregation and pollution of the mineral materials, and readjusting unqualified materials according to the first step until the maximum difference value of the passing rate curves of the upper, middle and lower layers of the stockpiles is not more than 20%;
step three: guiding the preparation of the materials according to the aggregate median mix proportion, determining the synthetic proportion of various mineral aggregates according to the grading range corresponding to the type of the asphalt mixture, trial-matching a required synthetic grading curve close to the median value by adopting a trial algorithm according to the screening grading curve and the grading range of various mineral aggregates, obtaining the composition proportion of various mineral aggregates under the grading curve, taking the mix proportion as the proportion of the preparation of various mineral aggregates, and preparing the materials according to the proportion;
designing the target mix proportion at the second stage:
the method comprises the following steps: screening and monitoring the material preparation process, namely preparing the materials according to the material preparation proportion obtained in the first stage, and performing a screening and monitoring test on the prepared mineral aggregate each time in the material preparation process to obtain screening test data of the prepared materials each time;
step two: calculating the blending proportion of synthetic graded mineral aggregate by a trial-mix method, designing the blending proportion when the prepared material reaches 60-70%, trial-mixing three synthetic graded curves close to an upper limit, a middle value and a lower limit according to a trial-mix algorithm, and respectively obtaining the mineral aggregate blending proportion corresponding to each graded curve;
step three: analyzing the volatility of the blending ratio, namely performing grading synthesis by using the blending ratios close to the upper limit, the middle value and the lower limit of the three groups of mineral aggregates with various specifications in combination with all screening test data obtained by quality control monitoring by adopting a trial algorithm to obtain three groups of grading synthetic curve sets, calculating the variation coefficient of the passing rate of each grade of sieve pore of aggregate synthetic grading, calculating the average variation coefficient of the sieve pore, and analyzing the volatility of the three groups of grading synthetic curve sets to a target curve;
step four: determining the optimal asphalt dosage and the final target mixing proportion, determining the optimal asphalt dosage by adopting an OAC method aiming at the three groups of mixing proportions, and respectively calculating the OAC1And OAC2，OAC1And OAC2The average value of the asphalt mixture is used as the optimal asphalt dosage, the construction and mixture characteristics and the fluctuation of each mixing proportion are integrated, and the final target mixing proportion and the optimal asphalt dosage are determined;
step five: testing the performance of the mixture, namely testing the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture, wherein the target mixing ratio is designed to be qualified if the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture meet the standard requirements, and otherwise, returning to the second step of the second stage to be carried out again;
step six: correcting the proportion and the quantity of subsequent prepared materials, and correcting the proportion and the quantity of the prepared materials for the mineral aggregate needing to be prepared subsequently according to the finally determined mineral aggregate mixing proportion.
EXAMPLE (AC-20 is an example)
Designing a target mix proportion in a first stage:
the method comprises the following steps: selecting raw materials
In this embodiment, taking an ancient highway a2 standard segment construction project as an example, AC-20C is adopted for asphalt concrete middle level distribution, and coarse and fine aggregates are processed into four specifications by using limestone, and the four specifications are divided into coarse aggregates: 1# material [15-25] mm, 2# material [10-15) mm, 3# material [5-10) mm and fine aggregate: the size of the 4# material is 0-5 mm, the specification of the selected asphalt is 90# A, and the mineral powder is processed by limestone;
step two: raw material quality monitoring and control
The coarse aggregates, the fine aggregates, the mineral powder and the asphalt are selected as raw materials and meet the requirements of technical Specifications for Highway engineering asphalt pavement construction (JTG F40-2004), index values meeting the requirements of the technical Specifications for Highway engineering asphalt pavement construction (JTG F40-2004) are called requirement values for convenience in distinguishing, and index values of the selected materials in the experiment are called experiment values. Wherein the content of the first and second substances,
the required values and experimental values of the coarse aggregate are shown in the following table:
Figure BDA0002866512990000071
Figure BDA0002866512990000072
the required values and experimental values of the fine aggregate are shown in the following table:
Figure BDA0002866512990000073
the required values and experimental values of the ore fines are shown in the following table:
Figure BDA0002866512990000074
the asphalt requirements and experimental values are shown in the following table:
Figure BDA0002866512990000075
Figure BDA0002866512990000081
monitoring and controlling the quality of raw materials, carrying out segregation monitoring on a stockpile of coarse and fine aggregates conveyed to the site, referring to fig. 2, respectively taking upper, middle and lower layers of the stockpile to carry out screening tests, drawing a passing rate curve, monitoring the segregation and pollution of the ore, wherein the stockpile in the figure 2 is segregated and unqualified, readjusting according to the first step, and then carrying out segregation monitoring until the maximum difference value of the passing rate curves of the upper, middle and lower layers of the stockpile is not more than 20%, and then carrying out a third step;
step three: guiding the preparation of the materials according to the median mix proportion of the aggregates
Determining the synthetic proportion of various mineral aggregates (including coarse and fine aggregates and mineral powder) according to the grading range corresponding to the type of the asphalt mixture, trial-distributing the required synthetic grading curve close to the median value by adopting a trial algorithm according to the screening grading curve and the grading range of the various mineral aggregates, obtaining the composition proportion of the various mineral aggregates under the grading curve, referring to the table 1 below, taking the blending proportion as the proportion of the prepared material of the various mineral aggregates, and preparing the material according to the proportion.
TABLE 1 mineral composition ratio
Figure BDA0002866512990000082
Designing the target mix proportion at the second stage:
the method comprises the following steps: feed preparation process screening monitoring
Preparing materials according to the material preparation proportion obtained in the first stage, and performing a screening monitoring test on the prepared mineral aggregate each time in the material preparation process to obtain screening test data of the prepared materials each time, and referring to the table 2 below.
TABLE 2 results of the screening tests of the preparation Process
Figure BDA0002866512990000091
Step two: calculating the blending ratio of synthetic graded mineral aggregate by trial blending
And designing the mixing proportion when the prepared materials reach 60-70%, trial-preparing three synthetic grading curves which are close to the upper limit, the middle value and the lower limit according to the standard file requirements by using a trial algorithm, and respectively obtaining the mineral material mixing proportion corresponding to each grading curve, wherein the mineral material mixing proportion is shown in the following table 3.
TABLE 3 composition of each gradation and corresponding blending ratio of mineral aggregates
Figure BDA0002866512990000092
Step three: mixing ratio fluctuation analysis
By utilizing the blending proportion of the three groups of mineral aggregates with various specifications close to the upper limit, the middle value and the lower limit, combining all screening test data obtained by the quality control monitoring in the prior art, carrying out grading synthesis by adopting a test algorithm to obtain three groups of grading synthetic curve sets, taking the curve set close to the middle value as an example, referring to fig. 3, calculating the variation coefficient of the sieve mesh passing rate of each grade of aggregate synthetic grading, referring to fig. 4, calculating the average variation coefficient of the sieve meshes, analyzing the fluctuation of the three groups of grading synthetic curve sets to a target curve,
coefficient of variation calculation formula:
Figure BDA0002866512990000101
wherein, σ: sample standard deviation
μ: sample mean
Average coefficient of variation of mesh:
Figure BDA0002866512990000102
the fluctuation can be analyzed by adopting an area method, the size of the overall fluctuation of each group of gradation is evaluated by calculating the area formed by each of the three groups of curve sets, the smaller the area is, the smaller the overall fluctuation is, the variation coefficient of the passing rate of each synthetic gradation sieve pore corresponding to the three groups of blending ratios is calculated, as shown in figure 4, the variation coefficient of the maximum passing rate of each sieve pore is required to be not more than 20%, the average variation coefficient of the sieve pores is calculated, and finally the fluctuation size of the three groups of blending ratios is comprehensively evaluated, as shown in the following table 4.
TABLE 4 analysis of the volatility of the synthetic grades
Grading type Synthetic grading curve set area Maximum coefficient of variation of sieve pore Mean coefficient of variation of mesh
Approaching the upper limit Big (a) 20.91 11.45
Near median value Small 10.37 5.62
Approach to the lower limit In 14.82 8.21
From the above, it can be seen that the minimum volatility of the graded composition ratio close to the median value can be considered preferentially, the maximum volatility of the graded composition ratio close to the upper limit is considered preferentially, and the maximum variation coefficient of the sieve pore exceeds 20%, and the ratio should be abandoned;
step four: determination of optimum asphalt dosage to final target mix ratio (taking near-median grading as an example)
Firstly, preliminarily estimating the optimal asphalt dosage to be 4.9% according to the standard requirement and the property of the asphalt to be used, respectively estimating the asphalt dosages to be +/-5% and +/-10%, obtaining five groups of asphalt dosages of 3.9%, 4.4%, 4.9%, 5.4% and 5.9%, forming a Marshall test piece, measuring four volume parameters of bulk density, calculating void ratio, mineral aggregate clearance rate and effective asphalt saturation, measuring Marshall stability and flow value, and respectively drawing a relation curve of each parameter and the five groups of asphalt dosages.
According to the relation curve, the corresponding asphalt dosage a corresponding to the maximum density value is obtained15.12%, maximum value of stability corresponding to asphalt dosage a24.87%, the asphalt content a of the asphalt corresponding to the target void ratio34.60 percent, the asphalt dosage a corresponding to the median saturation value of asphalt44.79%, according to the formula:
OAC1＝(a1+a2+a3+a4)/4＝4.85％
the asphalt dosage range OAC meeting the requirements of density, stability, flow value, target void ratio and asphalt saturationmin＝4.52％，OACmax5.03%, where the value is OAC2：
OAC2＝(OACmin+OACmax)/2＝4.78％
By OAC1And OAC2Calculating the optimum asphalt dosage OAC:
OAC＝(OAC1+OAC2)/2＝4.8％
after the blending ratios close to the upper limit, the middle value and the lower limit are obtained according to the method, Marshall test pieces with different asphalt dosages are formed, the asphalt dosages, the construction and mixture characteristics and the fluctuation of each blending ratio are integrated, and the final target blending ratio and the optimal asphalt dosage are determined, and the method is shown in the following table 5.
TABLE 5 comparison of determination standards for asphalt dosages at various levels
Grading type Amount of asphalt Construction and mix characteristics Mixing ratio fluctuation
Approaching the upper limit Big (a) Large amount of coarse aggregate and easy segregation Fail to be qualified
Near median value In Is preferably used Is preferably used
Approach to the lower limit Small High fine aggregate content and poor creep property In general
Therefore, the mixture proportion close to the median gradation is finally selected, namely 1# material: 2# material: 3# Material: 4# Material: the mineral powder accounts for 24%: 17%: 18%: 35%: 6 percent, and the optimal asphalt dosage is 4.8 percent;
step five: testing of mixture Properties
And (3) inspecting the performance of the mixture, performing a standard rutting test according to a method and test conditions specified in road engineering asphalt and asphalt mixture test procedure T0719 for high-temperature stability inspection, determining a dynamic stability index, performing a residual stability and freeze-thaw splitting test according to a method and test conditions specified in road engineering asphalt and asphalt mixture test procedure T0709 and T0729 for water stability and low-temperature cracking resistance inspection, and inspecting a ratio index of the residual stability to the residual strength, wherein as shown in the following table 6, if the indexes meet the specification requirements, the target mix ratio is qualified, otherwise, returning to the second step of the second stage for re-performing.
TABLE 6 Freeze-thaw splitting test and rut test results
Figure BDA0002866512990000121
Step six: correcting the ratio and quantity of subsequent stock
And (3) correcting the proportion and the quantity of the prepared mineral materials which need to be prepared successively according to the finally determined blending proportion of the mineral materials (namely, 24 percent of 1# material: 2# material: 3# material: 4# material: mineral powder: 17 percent: 18 percent: 35 percent: 6 percent), and finishing all the work of the target blending proportion design through the processes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (2)

1. A two-stage design method for target mix proportion of asphalt mixture is characterized by comprising the following steps: the method comprises the following steps:
designing a target mix proportion in a first stage:
the method comprises the following steps: selecting raw materials comprising coarse aggregates, fine aggregates, asphalt and mineral powder, wherein the coarse aggregates and the fine aggregates are processed into various specifications according to the requirements of technical Specification for construction of asphalt pavements for road engineering (JTG F40-2004) 4.8.3;
step two: monitoring and controlling the quality of raw materials, namely performing segregation monitoring on a stockpile of coarse and fine aggregates conveyed to the site, performing screening tests on upper, middle and lower layers of the stockpile respectively, drawing a passing rate curve, monitoring the segregation and pollution of the mineral aggregates, and readjusting unqualified materials according to the first step until the maximum difference value of the passing rate curves of the upper, middle and lower layers of the stockpile is not more than 20%;
step three: guiding the preparation of the materials according to the aggregate median mix proportion, determining the synthetic proportion of various mineral aggregates according to the grading range corresponding to the type of the asphalt mixture, trial-matching a required synthetic grading curve close to the median value by adopting a trial algorithm according to the screening grading curve and the grading range of various mineral aggregates, obtaining the composition proportion of various mineral aggregates under the grading curve, and taking the mixing proportion as the proportion of the preparation of various mineral aggregates;
designing the target mix proportion at the second stage:
the method comprises the following steps: screening and monitoring the material preparation process, wherein in the material preparation process, screening and monitoring tests are carried out on the prepared mineral aggregate each time, and screening test data of the prepared material each time are obtained;
step two: calculating the blending proportion of synthetic graded mineral aggregate by a trial-mix method, designing the blending proportion when the prepared material reaches 60-70%, trial-mixing three synthetic graded curves close to an upper limit, a middle value and a lower limit according to a trial-mix algorithm, and respectively obtaining the mineral aggregate blending proportion corresponding to each graded curve;
step three: analyzing the volatility of the blending ratio, namely performing grading synthesis by using the blending ratios close to the upper limit, the middle value and the lower limit of the three groups of mineral aggregates with various specifications in combination with all screening test data obtained by quality control monitoring by adopting a trial algorithm to obtain three groups of grading synthetic curve sets, calculating the variation coefficient of the passing rate of each grade of sieve pore of aggregate synthetic grading, calculating the average variation coefficient of the sieve pore, and analyzing the volatility of the three groups of grading synthetic curve sets to a target curve;
step four: determining the optimal asphalt dosage and the final target mixing proportion, determining the optimal asphalt dosage by adopting an OAC method aiming at the three groups of mixing proportions, and respectively calculating the OAC1And OAC2，OAC1And OAC2The average value of the asphalt mixture is used as the optimal asphalt dosage, the construction and mixture characteristics and the fluctuation of each mixing proportion are integrated, and the final target mixing proportion and the optimal asphalt dosage are determined;
step five: testing the performance of the mixture, namely testing the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture, wherein the target mixing ratio is designed to be qualified if the high-temperature stability, the water stability and the low-temperature crack resistance of the mixture meet the standard requirements, and otherwise, returning to the second step of the second stage to be carried out again;
step six: correcting the proportion and the quantity of subsequent prepared materials, and correcting the proportion and the quantity of the prepared materials for the mineral aggregate needing to be prepared subsequently according to the finally determined mineral aggregate mixing proportion.
2. The two-stage design method for the target mix proportion of the asphalt mixture according to claim 1, wherein: analyzing the volatility in the third step of the second stage target mix proportion design by adopting an area method, evaluating the overall volatility of each group of gradation by calculating the area formed by each of three groups of curve sets, wherein the smaller the area is, the smaller the overall volatility is, then calculating the variation coefficient of the passing rate of each grade of synthetic gradation sieve pore corresponding to the three groups of mix proportions, and requiring that the maximum passing rate variation coefficient of each sieve pore is not more than 20%, then calculating the average variation coefficient of the sieve pores, and finally comprehensively evaluating the volatility of the three groups of mix proportions.
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