CN111243685A - Design method for mix proportion of pervious asphalt concrete mixture - Google Patents

Design method for mix proportion of pervious asphalt concrete mixture Download PDF

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CN111243685A
CN111243685A CN202010133624.6A CN202010133624A CN111243685A CN 111243685 A CN111243685 A CN 111243685A CN 202010133624 A CN202010133624 A CN 202010133624A CN 111243685 A CN111243685 A CN 111243685A
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mixture
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water
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沈强儒
李斌
崔建荣
汤天培
陈宇峰
陈虹
朱翊晗
贾长虎
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Nantong University
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Abstract

The invention discloses a design method of a mix proportion of a pervious asphalt concrete mixture, which comprises the following steps: a. selecting a formula of an asphalt mixture; b. preparing various asphalt mixtures with different filler particle sizes by adopting the formula in the step a; c. b, carrying out water permeability characteristic and road performance tests on the various asphalt mixtures in the step b; d. and c, summarizing and analyzing the mechanisms analyzed in the step c to obtain a conclusion. The invention provides a design method of the mix proportion of a pervious asphalt concrete mixture, which can meet the requirements of different roads on the pervious asphalt mixture by adjusting the proportion and selecting materials in the pervious asphalt concrete mixture through a formula, solves the problems of various formulas and difficulty in selection, and can meet different requirements through the formula.

Description

Design method for mix proportion of pervious asphalt concrete mixture
Technical Field
The invention belongs to the field of civil engineering, and particularly relates to a design method of a mix proportion of a pervious asphalt concrete mixture.
Background
The problems of high development strength, more hard pavement and the like exist in the rapid urbanization development process of China, more than 90 percent of the currently built asphalt pavement is designed according to the compact grading principle, and the method belongs to the design of a dense asphalt concrete pavement with smaller void ratio. The pavement structure has the characteristics of compactness, difficulty in water permeation, high strength, good water stability, low-temperature crack resistance and durability, poor high-temperature stability and high noise, and the asphalt concrete is densely matched as an anti-skid surface layer, so that accumulated water on the pavement cannot be drained in time, water mist and glare are easily caused, water drift is easily caused when an automobile runs at high speed, and the anti-skid performance of the pavement and the driving safety are seriously influenced. On the other hand, more than 70% of the urban area is covered by hardened structures (buildings, urban roads, squares and the like), so that the sources of pollutants are greatly increased, and the pollution degree of the rainwater runoff is further increased. Research shows that urban surface runoff is the second only to urban domestic sewage and industrial wastewater as a source of urban water environment pollution.
A water-permeable asphalt pavement or a porous asphalt pavement has a porosity of about 15-25% after compaction and can form a novel asphalt concrete surface layer of a drainage channel in a mixture, the surface layer is substantially an open-graded asphalt mixture with a framework-void structure formed by single-particle-size crushed stones according to an embedding and extruding mechanism, the large-void asphalt mixture is used as a surface layer, rainfall permeates into a drainage functional layer, and rainwater is transversely discharged through the surface layer, so that a road surface water film which brings adverse effects of driving is eliminated, and the safety and the comfort of driving in rainy days are remarkably improved.
However, the permeable asphalt mixture cannot be recombined according to the road surfaces with different requirements by using multiple formulas, so that different problems are solved, and the mode is complicated and difficult to select.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the defects in the prior art and provide a mix proportion design method of a permeable asphalt concrete mixture, wherein the mix proportion and the material selection are adjusted by a formula, so that different roads can be used for meeting the requirements of the permeable asphalt mixture, the problems of various formulas and difficulty in selection are solved, the formulas can meet different requirements, but only one formula is used for a building material company for paving the roads, the purchase cost of the related formula can be reduced, and the dispute on the reverse side of the later intellectual property rights is reduced.
The technical scheme is as follows: the invention relates to a design method of the mix proportion of a pervious asphalt concrete mixture, which comprises the following steps:
a. selecting a permeable asphalt mixture, wherein the permeable asphalt mixture is composed of 1-5% of high-viscosity modified asphalt and 95-99% of fillers, and the high-viscosity modified asphalt is prepared by taking SK-70 as matrix asphalt and modifying by adopting 12% of high-viscosity additive TPS; the filler consists of 50-60% of coarse aggregate, 35-42% of fine aggregate and 5-8% of filler;
b. preparing various asphalt mixtures with different filler particle sizes by adopting the formula in the step a;
c. b, carrying out water permeability characteristic and road performance tests on the various asphalt mixtures in the step b; the specific test method is as follows:
(1) water permeability characteristics
Representing the water permeability characteristic of the asphalt mixture by adopting a void distribution characteristic (porosity, effective porosity and effective porosity percentage) and a water permeability coefficient index; wherein, the bulk density of the mixture is measured according to T0707-2011 (see formula 1), and the effective void percentage is calculated according to formulas (2) to (4):
Figure BDA0002394885030000021
in the formula: lambda [ alpha ]fShowing the relative density of the bulk volume of the test piece; a and B represent the dry test piece mass and the sealed test piece mass, g, respectively; c represents the mass of the sealing test piece in water, g; e represents the mass of the test piece with the sealing bag removed, g; f represents the relative density of the sealed bag;
Figure BDA0002394885030000022
V＝Vgeneral assembly-V0(8)
Figure BDA0002394885030000023
In the formula: pIs effectiveRepresents the percent of connected voids,%; vIs effectiveRepresents the effective void volume, cm, of the test piece3；VGeneral assemblyRepresents the total volume of the test piece in cm3；V0Representing volume and cm of asphalt, aggregate and internal closed space3；maAnd mwRespectively representing the weight of the test piece in the air and the weight of the test piece in water, g; rhowRepresents the water density, g/cm3；
Testing the water permeability coefficient of the mixture by adopting a constant head test to evaluate the water permeability of the mixture, and calculating a formula (5);
Figure BDA0002394885030000024
in the formula: crwThe permeability coefficient of the test piece; q represents water consumption in cm of the penetration test piece3；t1And t2Respectively representing the starting time and the ending time of the test; a is expressed as the cross-sectional area of the specimen in cm2(ii) a H represents the head height, cm;
(2) road performance
Referring to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), Marshall residual stability (RMS) and freeze-thaw cleavage strength ratio (TSR) are adopted to characterize the water stability of the asphalt mixture, and the size of a test piece is
Figure BDA0002394885030000025
Evaluating the high-temperature anti-rutting capability of the permeable asphalt mixture by adopting a rutting test, wherein the size of a test piece is 300mm multiplied by 50 mm; cutting the wheel rolling forming permeable asphalt mixing material plate into small beam test pieces of 30mm multiplied by 35mm multiplied by 250mm for testing the low temperature performance thereofAt-10 ℃ and a loading rate of 5 mm/min; referring to 'road subgrade and pavement site test regulations' (JTG E60-2008), a pendulum instrument is adopted to measure the pavement pendulum value so as to evaluate the pavement skid resistance of the permeable mixture;
d. and c, summarizing and analyzing the mechanisms analyzed in the step c to obtain a conclusion.
Further preferably, the fine aggregate in the step a has an apparent density of 2.70g/cm3, a firmness test result of 10% and a mud content of 0.7%.
Further preferably, in the step a, the coarse aggregate has the apparent density of 2.63g/cm3, the water absorption rate of 1.3 percent, the crushing index of 12.1 percent, the adhesion grade with asphalt of 5 grade, the grinding value of 40.6 percent and the los Angeles abrasion value of 21.7 percent.
Preferably, basalt is adopted as the coarse aggregate and the fine aggregate.
Further preferably, the apparent density and the water content of the filler in the step a are respectively 2.75g/cm3 and 0.30%.
Further preferably, the filler is common limestone ground mineral powder.
More preferably, the asphalt mixtures in the step b are respectively PAC-10 asphalt mixtures, PAC-10-1 asphalt mixtures, PAC-10-2 asphalt mixtures, PAC-13 asphalt mixtures and PAC-16 asphalt mixtures.
Has the advantages that: the invention discloses a design method of the mix proportion of a pervious asphalt concrete mixture, which is proved by research that the inverse relation of each family of the formula can be adjusted according to the requirement, and the design method comprises the following specific steps: as the proportion of the coarse aggregate and the nominal maximum particle size are improved, indexes such as porosity, effective porosity percentage, water permeability coefficient and the like of the permeable asphalt mixture are all increased along with the improvement of the proportion of the coarse aggregate and the nominal maximum particle size of the mixture, and the change range of the indexes of the effective porosity percentage and the water permeability coefficient is larger than that of the porosity and the effective porosity. As the proportion of coarse aggregate and the nominal maximum particle size are increased, the anti-skid property and the high-temperature stability of the permeable asphalt mixture are increased, and the water stability and the low-temperature performance are reduced. In order to improve the anti-skid property and high-temperature stability of the pervious asphalt mixture, the proportion of coarse aggregates and the nominal maximum particle size are recommended to be increased so as to improve the water stability and the low temperature propertyIt can be recommended to reduce the coarse aggregate fraction and the nominal maximum particle size. The effective porosity index can more accurately reflect the water permeability of the water permeable mixture, the correlation coefficient of the effective porosity and the water permeability coefficient is as high as 0.98562, the effective porosity index and the water stability, the high-temperature stability, the low-temperature crack resistance and the anti-skid performance of the mixture all have good linear relations, and the effective porosity index and the linear correlation coefficient (R) among the dynamic stability times, the bending and pulling damage strain, the Marshall residual stability, the freeze-thaw splitting strength ratio and the swing value of the mixture are linear2) 0.98398, 0.96921, 0.97725, 0.95671 and 0.98118 respectively, which show that the effective porosity index approximately reflects the water permeability and road performance of the mixture; the invention provides a design method of the mix proportion of a pervious asphalt concrete mixture, which can meet the requirements of different roads on the pervious asphalt mixture by adjusting the proportion and selecting materials through a formula, solves the problems of various formulas and difficulty in selection, and can meet different requirements by the formula, but the formula is only one for a building material company laying the road, so that the purchase cost of the related formula can be reduced, and the dispute on the reverse side of the later intellectual property right can be reduced.
Drawings
FIG. 1 shows the results of a mineral aggregate grading curve test;
FIG. 2 shows the results of pore structure characteristic test of permeable asphalt mixture;
FIG. 3 shows the result of water permeability coefficient test of a water permeable asphalt mixture;
FIG. 4 shows the swing value test results of the water-permeable asphalt mixture;
FIG. 5 shows the results of water stability test of water-permeable asphalt mixture;
FIG. 6 shows the result of the dynamic stability times test of the permeable asphalt mixture;
FIG. 7 shows the results of the low temperature performance test of the permeable asphalt mixture;
FIG. 8 is a linear fitting relationship of porosity and water permeability coefficient of the mixture;
FIG. 9 is a linear fitting relationship between effective porosity and road performance of mixture
Detailed Description
A design method for the mix proportion of a pervious asphalt concrete mixture comprises the following steps:
a. selecting a permeable asphalt mixture, wherein the permeable asphalt mixture is composed of 1-5% of high-viscosity modified asphalt and 95-99% of fillers, and the high-viscosity modified asphalt is prepared by taking SK-70 as matrix asphalt and modifying by adopting 12% of high-viscosity additive TPS; the filler consists of 50-60% of coarse aggregate, 35-42% of fine aggregate and 5-8% of filler;
b. preparing various asphalt mixtures with different filler particle sizes by adopting the formula in the step a;
c. b, carrying out water permeability characteristic and road performance tests on the various asphalt mixtures in the step b; the specific test method is as follows:
(1) water permeability characteristics
Representing the water permeability characteristic of the asphalt mixture by adopting a void distribution characteristic (porosity, effective porosity and effective porosity percentage) and a water permeability coefficient index; wherein, the bulk density of the mixture is measured according to T0707-2011 (see formula 1), and the effective void percentage is calculated according to formulas (2) to (4):
Figure BDA0002394885030000041
in the formula: lambda [ alpha ]fShowing the relative density of the bulk volume of the test piece; a and B represent the dry test piece mass and the sealed test piece mass, g, respectively; c represents the mass of the sealing test piece in water, g; e represents the mass of the test piece with the sealing bag removed, g; f represents the relative density of the sealed bag;
Figure BDA0002394885030000042
V＝Vgeneral assembly-V0(13)
Figure BDA0002394885030000043
In the formula: pIs effectiveRepresents the percent of connected voids,%; vIs effectiveRepresents the effective void volume, cm, of the test piece3；VGeneral assemblyIndicating the total of the test pieceVolume, cm3；V0Representing volume and cm of asphalt, aggregate and internal closed space3；maAnd mwRespectively representing the weight of the test piece in the air and the weight of the test piece in water, g; rhowRepresents the water density, g/cm3；
Testing the water permeability coefficient of the mixture by adopting a constant head test to evaluate the water permeability of the mixture, and calculating a formula (5);
Figure BDA0002394885030000044
in the formula: crwThe permeability coefficient of the test piece; q represents water consumption in cm of the penetration test piece3；t1And t2Respectively representing the starting time and the ending time of the test; a is expressed as the cross-sectional area of the specimen in cm2(ii) a H represents the head height, cm;
(2) road performance
Referring to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), Marshall residual stability (RMS) and freeze-thaw cleavage strength ratio (TSR) are adopted to characterize the water stability of the asphalt mixture, and the size of a test piece is
Figure BDA0002394885030000045
Evaluating the high-temperature anti-rutting capability of the permeable asphalt mixture by adopting a rutting test, wherein the size of a test piece is 300mm multiplied by 50 mm; cutting the wheel rolling forming permeable asphalt mixing plate into a small beam test piece of 30mm multiplied by 35mm multiplied by 250mm to test the low temperature performance, wherein the test temperature is minus 10 ℃, and the loading rate is 5 mm/min; referring to 'road subgrade and pavement site test regulations' (JTG E60-2008), a pendulum instrument is adopted to measure the pavement pendulum value so as to evaluate the pavement skid resistance of the permeable mixture;
d. and c, summarizing and analyzing the mechanisms analyzed in the step c to obtain a conclusion.
In this example, the fine aggregate in the step a has an apparent density of 2.70g/cm3, a firmness test result of 10%, and a mud content of 0.7%.
In this example, the coarse aggregate in step a has an apparent density of 2.63g/cm3, a water absorption of 1.3%, a crush index of 12.1%, a grade of 5 adhesion to asphalt, a burnishing value of 40.6%, and a los Angeles attrition value of 21.7%.
In this example, basalt is used for both the coarse aggregate and the fine aggregate.
In this example, the apparent density and water content of the filler in the step a are 2.75g/cm3 and 0.30%, respectively.
In this example, the filler is ground ordinary limestone mineral powder.
In the example, the various asphalt mixtures in the step b are respectively PAC-10 asphalt mixtures, PAC-10-1 asphalt mixtures, PAC-10-2 asphalt mixtures, PAC-13 asphalt mixtures and PAC-16 asphalt mixtures.
The five permeable asphalt mixtures of PAC-10, PAC-10-1, PAC-10-2, PAC-13 and PAC-16 are prepared by the formula, and the formula of each filler is as follows:
Figure BDA0002394885030000051
the contents of the high-viscosity modified asphalt of PAC-10, PAC-10-1, PAC-10-2, PAC-13 and PAC-16 were 1.18%, 2.05%, 2.18%, 2.52%, 3.21% and 3.85%, respectively.
Designing a permeable asphalt mixture according to a shellfish method, wherein a mineral aggregate grading curve is shown in figure 1;
firstly, testing the water permeability: the specific test method is as follows:
and (3) representing the water permeability characteristic of the asphalt mixture by adopting the void distribution characteristics (porosity, effective porosity and effective porosity percentage) and the water permeability coefficient index. Wherein, the bulk density of the mixture is measured according to T0707-2011 (see formula 1), and the effective void percentage is calculated according to formulas (2) to (4):
Figure BDA0002394885030000052
in the formula: lambda [ alpha ]fShowing the relative density of the bulk volume of the test piece; a and B represent the dry test piece mass and the sealed test piece mass, g, respectively; c represents the mass of the sealing test piece in water, g; e represents the mass of the test piece with the sealing bag removed, g; f denotes the relative density of the sealed pouch.
Figure BDA0002394885030000053
V＝VGeneral assembly-V0(18)
Figure BDA0002394885030000054
In the formula: pIs effectiveRepresents the percent of connected voids,%; vIs effectiveRepresents the effective void volume, cm, of the test piece3；VGeneral assemblyRepresents the total volume of the test piece in cm3；V0Representing volume and cm of asphalt, aggregate and internal closed space3；maAnd mwRespectively representing the weight of the test piece in the air and the weight of the test piece in water, g; rhowRepresents the water density, g/cm3。
The water permeability coefficient of the mixture is tested by adopting a constant head test to evaluate the water permeability of the mixture, and a formula is calculated and shown in a formula (5).
Figure BDA0002394885030000061
In the formula: crwThe permeability coefficient of the test piece; q represents water consumption in cm of the penetration test piece3；t1And t2Respectively representing the starting time and the ending time of the test; a is expressed as the cross-sectional area of the specimen in cm2(ii) a H denotes head height, cm.
As a result:
1. the pore characteristics of the permeable asphalt mixture with different grades and the maximum nominal particle size are calculated according to the above results and are shown in fig. 2, and the results of the test in fig. 2 show that the pore characteristics of the permeable asphalt mixture with three grades have little difference, and the pore characteristics, the effective porosity and the effective porosity are all as follows: PAC-10-2 is the largest, PAC-10-1 is the largest, and PAC-10 is the smallest. The results show that the larger the coarse aggregate fraction, the poorer the mix pore structure (the greater the porosity and effective porosity), because the larger the coarse aggregate fraction, the more the framework tends to be in a less dense packing state, resulting in a reduced asphalt filling state and effective asphalt saturation. PAC-13 and PAC-16 porosity increased 14.21% and 16.39%, respectively, effective porosity increased 30.77% and 35.66%, respectively, and effective porosity percentage increased 4.51% and 18.68%, respectively, as compared to PAC-10. The result shows that the porosity, the effective porosity and the effective porosity percentage of the pervious asphalt mixture are obviously increased along with the increase of the maximum nominal grain diameter of the aggregate.
2. Coefficient of water permeability
FIG. 3 shows the test results of the influence of grading and maximum nominal particle size on the water permeability coefficient of a mixture. As can be seen from the graph 3, the influence rule of the aggregate-grade paired pore structure is similar, and the water permeability coefficient of the mixture is larger along with the increase of the proportion of the coarse aggregates. Comparing the water permeability coefficients of PAC-10, PAC-13 and PAC-16, it can be seen that the water permeability coefficient of PAC-13 is 27.27% greater than that of PAC-10, while the water permeability coefficient of PAC-16 is 43.08% greater than that of PAC-10. The result shows that the water permeability coefficient of the water permeable asphalt mixture is continuously improved along with the increase of the maximum nominal particle size of the aggregate.
II, road performance test:
referring to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), Marshall residual stability (RMS) and freeze-thaw cleavage strength ratio (TSR) are adopted to characterize the water stability of the asphalt mixture, and the size of a test piece is
Figure BDA0002394885030000062
And evaluating the high-temperature anti-rutting capability of the permeable asphalt mixture by adopting a rutting test, wherein the size of a test piece is 300mm multiplied by 50 mm. The wheel rolling forming permeable asphalt mixing plate is cut into small beam test pieces of 30mm multiplied by 35mm multiplied by 250mm, the low temperature performance is tested, the test temperature is minus 10 ℃, and the loading rate is 5 mm/min. Referring to 'road subgrade and pavement site test regulations' (JTG E60-2008), a pendulum instrument is adopted to measure the pavement pendulum value so as to evaluate the skid resistance of the permeable mixture pavement.
Results
1. Anti-skid property
FIG. 4 shows the results of tests on the influence of gradation and maximum nominal particle size on the anti-skid properties of the blends. As can be seen from FIG. 4, the PAC-10-1 and PAC-10-2 run-out values increased by 2.27% and 6.30%, respectively, as compared to PAC-10. The results show that when the maximum nominal grain size of the aggregate is the same, the anti-skid performance of the mixture is improved along with the increase of the proportion of the coarse aggregate. This is because the larger the proportion of coarse aggregate is, the larger the frictional resistance between the wheel and the aggregate is, resulting in a small increase in road surface throw value. And PAC-13 and PAC-16 run values increased by 0.76% and 5.54%, respectively, compared to PAC-10. Indicating that the mixture resists sliding as the maximum nominal particle size of the aggregate increases.
2. Stability to water
FIG. 5 shows the effect of grading and maximum nominal particle size on the water stability of a water-permeable asphalt mixture. As can be seen from FIG. 5, the mixture PAC-10-1 has a Marshall residual stability and a freeze-thaw split strength ratio decreased by 3.54% and 1.81%, respectively, compared to PAC-10, while the mixture PAC-10-2 has a Marshall residual stability and a freeze-thaw split strength decreased by 8.36% and 5.40%, respectively, compared to PAC-10. The results show that the same maximum nominal particle size, the poorer the water stability of the mix as the coarse aggregate proportion increases, which may be related to the increased porosity of the mix resulting from the increased coarse aggregate proportion. And the PAC-13 and PAC-16 Marshall residual stability and the ratio of freeze-thaw split strength are both lower than that of PAC-10. Indicating that the worse the water stability of the blend, the greater the maximum nominal aggregate size.
3. High temperature stability
FIG. 6 shows the results of the test of the influence of gradation and maximum nominal particle size on the dynamic stability times of the mixture. As can be seen from FIG. 6, the number of dynamic stabilization times of PAC-10-1 and PAC-10-2 increased 14.10% and 29.19% respectively as compared with PAC-10, while the number of dynamic stabilization times of PAC-13 and PAC-16 increased 36.15% and 46.67% respectively as compared with PAC-10. The results show that when the maximum nominal grain size of the aggregate is the same, the dynamic stability times of the mixture are increased slightly along with the increase of the proportion of the coarse aggregate. And when the maximum nominal grain size of the aggregate is increased, the dynamic stability times of the mixture are greatly increased, and in order to improve the high-temperature stability of the permeable asphalt mixture, the proportion of coarse aggregate is properly increased or the maximum nominal grain size of the aggregate is improved.
4. Low temperature cracking performance
FIG. 7 shows the results of tests on the influence of the gradation and the maximum nominal particle size on the flexural tensile strength, the flexural breaking strain and the flexural stiffness modulus of the mixture. As can be seen from FIG. 7a, the flexural tensile strength and flexural stiffness modulus of the permeable asphalt mixture increased with increasing coarse aggregate fraction, and the flexural tensile failure strain decreased with increasing coarse aggregate fraction, indicating that the more coarse aggregate fraction, the worse the low temperature performance of the mixture. The bending tensile strength, the bending tensile failure strain and the stiffness modulus of the PAC-13 mixture are respectively improved by 38.29 percent, -11.01 percent and 60.49 percent compared with the PAC-10 mixture, and the bending tensile failure strain and the stiffness modulus of the PAC-16 mixture are respectively improved by 59.07 percent, 14.87 percent and 109.3 percent compared with the PAC-10 mixture. The result shows that the maximum nominal grain size of the aggregate has obvious influence on the low-temperature performance of the pervious asphalt mixture, and the lower the low-temperature performance of the mixture is along with the increase of the maximum nominal grain size of the aggregate.
Fitting a curve of the effective porosity of the pervious asphalt mixture, the water permeability and the road performance; as a result:
1. linear relation between effective porosity and water permeability coefficient of mixture
FIG. 8 is a linear fitting relationship of the water permeability coefficient of the permeable asphalt mixture and the porosity and effective porosity of the mixture. As can be seen from FIG. 8, the correlation index (R) between the porosity of the pervious asphalt mixture and the water permeability2) 0.89842, and the dependence index (R) of the effective porosity of the mixture on the water permeability coefficient2) The porosity is 0.98562, which shows that the effective porosity can be used as the evaluation index for evaluating the water permeability of the mixture, and the two have positive correlation.
2 effective porosity and mixture road performance linear fitting curve
FIG. 9 is a linear fitting relationship between the effective porosity of the pervious asphalt mixture and road performance (water stability, high-temperature stability, low-temperature crack resistance and skid resistance). As can be seen from FIG. 9, the correlation index (R) of the effective porosity of the mixture with the number of dynamic stability times and the strain at break in bending (R) is shown2) 0.98398 and 0.96921, respectively. Correlation index (R) of mixture effective porosity with Marshall residual stability and freeze-thaw split strength ratio2) 0.97725 and 0.95671, respectively. Effective porosity versus swing value dependency index (R)2) Is 0.98118. The result shows that the effective porosity of the pervious asphalt mixture and the high stability, low temperature crack resistance, water stability and skid resistance of the pervious asphalt mixture all show good linear relationshipThe pavement performance of the permeable asphalt mixture can be reflected to a certain extent through the effective porosity index of the mixture, so that the effective porosity index of the permeable asphalt mixture is reasonably controlled to ensure that the permeable asphalt mixture has good pavement performance.
In summary, the following conclusions are drawn:
(1) the porosity characteristics (porosity, effective porosity percentage and water permeability coefficient) of the permeable asphalt mixture are increased along with the increase of the proportion of the coarse aggregates and the nominal maximum particle size, and the index variation range of the effective porosity percentage and the water permeability coefficient is larger;
(2) as the proportion of coarse aggregate and the nominal maximum particle size are increased, the anti-skid property and the high-temperature stability of the permeable asphalt mixture are increased, and the water stability and the low-temperature performance are reduced. In order to improve the anti-skid property and high-temperature stability of the permeable asphalt mixture, the proportion of coarse aggregates and the nominal maximum particle size are recommended to be increased. Improving water stability and low temperature performance, and suggesting to reduce coarse aggregate proportion and nominal maximum grain size;
(3) the effective porosity index can more accurately reflect the water permeability of the water permeable mixture, the correlation coefficient of the effective porosity and the water permeability coefficient is as high as 0.98562, and the effective porosity index and the water stability, the high-temperature stability, the low-temperature crack resistance and the skid resistance of the mixture are in good linear relation, which shows that the effective porosity index can approximately reflect the water permeability and the road performance of the mixture.
The PAC-16 performance is found to be in the optimal state by comparing the dynamic stability, the effective porosity, the water permeability coefficient, the anti-slip performance, the high-temperature stability and the low-temperature cracking performance of the mixture of the five types of permeable asphalt, i.e. PAC-10, PAC-10-1, PAC-10-2, PAC-13 and PAC-16.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. A design method for the mix proportion of a pervious asphalt concrete mixture is characterized by comprising the following steps: the method comprises the following steps:
a. selecting a permeable asphalt mixture, wherein the permeable asphalt mixture is composed of 1-5% of high-viscosity modified asphalt and 95-99% of fillers, and the high-viscosity modified asphalt is prepared by taking SK-70 as matrix asphalt and modifying by adopting 12% of high-viscosity additive TPS; the filler consists of 50-60% of coarse aggregate, 35-42% of fine aggregate and 5-8% of filler;
b. preparing various asphalt mixtures with different filler particle sizes by adopting the formula in the step a;
c. b, carrying out water permeability characteristic and road performance tests on the various asphalt mixtures in the step b; the specific test method is as follows:
(1) water permeability characteristics
Representing the water permeability characteristic of the asphalt mixture by adopting a void distribution characteristic (porosity, effective porosity and effective porosity percentage) and a water permeability coefficient index; wherein, the bulk density of the mixture is measured according to T0707-2011 (see formula 1), and the effective void percentage is calculated according to formulas (2) to (4):
Figure FDA0002394885020000011
in the formula: lambda [ alpha ]fShowing the relative density of the bulk volume of the test piece; a and B represent the dry test piece mass and the sealed test piece mass, g, respectively; c represents the mass of the sealing test piece in water, g; e represents the mass of the test piece with the sealing bag removed, g; f represents the relative density of the sealed bag;
Figure FDA0002394885020000012
V＝Vgeneral assembly-V0(3)
Figure FDA0002394885020000013
In the formula: pIs effectiveRepresents the percent of connected voids,%; vIs effectiveRepresents the effective void volume, cm, of the test piece3；VGeneral assemblyRepresents the total volume of the test piece in cm3；V0Representing volume and cm of asphalt, aggregate and internal closed space3；maAnd mwRespectively representing the weight of the test piece in the air and the weight of the test piece in water, g; rhowRepresents the water density, g/cm3；
Testing the water permeability coefficient of the mixture by adopting a constant head test to evaluate the water permeability of the mixture, and calculating a formula (5);
Figure FDA0002394885020000014
in the formula: crwThe permeability coefficient of the test piece; q represents water consumption in cm of the penetration test piece3；t1And t2Respectively representing the starting time and the ending time of the test; a is expressed as the cross-sectional area of the specimen in cm2(ii) a H represents the head height, cm;
(2) road performance
Referring to road engineering asphalt and asphalt mixture test procedures (JTG E20-2011), Marshall residual stability (RMS) and freeze-thaw cleavage strength ratio (TSR) are adopted to characterize the water stability of the asphalt mixture, and the size of a test piece is
Figure FDA0002394885020000015
Evaluating the high-temperature anti-rutting capability of the permeable asphalt mixture by adopting a rutting test, wherein the size of a test piece is 300mm multiplied by 50 mm; cutting the wheel rolling forming permeable asphalt mixing plate into a small beam test piece of 30mm multiplied by 35mm multiplied by 250mm to test the low temperature performance, wherein the test temperature is minus 10 ℃, and the loading rate is 5 mm/min; referring to 'road subgrade and pavement site test regulations' (JTG E60-2008), a pendulum instrument is adopted to measure the pavement pendulum value so as to evaluate the pavement skid resistance of the permeable mixture;
d. and c, summarizing and analyzing the mechanisms analyzed in the step c to obtain a conclusion.
2. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1, characterized in that: the apparent density of the fine aggregate in the step a is 2.70g/cm3, the firmness test result is 10%, and the mud content is 0.7%.
3. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1, characterized in that: in the step a, the apparent density of the coarse aggregate is 2.63g/cm3, the water absorption is 1.3%, the crushing index is 12.1%, the grade of adhesion with asphalt is 5, the grinding value is 40.6%, and the abrasion value of los angeles is 21.7%.
4. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1 or 3, characterized in that: and the coarse aggregate and the fine aggregate both adopt basalt.
5. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1, characterized in that: the apparent density and the water content of the filler in the step a are respectively 2.75g/cm3 and 0.30 percent.
6. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1 or 5, characterized in that: the filler is common limestone ground mineral powder.
7. The mix proportion design method of the pervious asphalt concrete mixture according to claim 1, characterized in that: and in the step b, the various asphalt mixtures are respectively PAC-10, PAC-10-1, PAC-10-2, PAC-13 and PAC-16 asphalt mixtures.
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