CN107220460B - Mix proportion design method of high-friction-resistance asphalt mixture - Google Patents
Mix proportion design method of high-friction-resistance asphalt mixture Download PDFInfo
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Abstract
The invention discloses a mix proportion design method of a high-friction asphalt mixture, which comprises the following steps: firstly, determining the construction depth of a high friction resistance asphalt mixture to be designed; secondly, selecting coarse aggregates with excellent anti-skid performance; thirdly, designing gradation, and blending into mineral aggregate; fourthly, estimating the construction depth of the asphalt mixture according to the asphalt mixture skid resistance estimation model, and if the construction depth meets the requirements, preparing the asphalt mixture; otherwise, returning to the third step; fifthly, carrying out an indoor long-term anti-slip performance test on the asphalt mixture, and entering a sixth step if the asphalt mixture meets the requirements; otherwise, returning to the third step; sixthly, performing a road performance test on the asphalt mixture, and if the road performance test meets the requirements, obtaining the high-friction asphalt mixture; otherwise, a higher grade of bitumen is employed. The method estimates the anti-skid performance of the asphalt mixture by constructing the depth estimation model, has stronger purposiveness compared with the traditional method, and can better ensure that the designed asphalt mixture has good anti-skid performance.
Description
Technical Field
The invention belongs to the technical field of asphalt pavements, and particularly relates to a mix proportion design method of a high-friction asphalt mixture.
Background
With the rapid development of the expressway industry in China, the threats of the faced traffic accidents are more and more, and the important factor influencing the traffic accidents on the road surface is the anti-skid performance of the road surface. The good road surface anti-skid performance can reduce the occurrence of traffic accidents, and the control of the road surface anti-skid performance is the most direct and effective method for reducing the occurrence of traffic accidents. However, the anti-sliding performance of the surface layer of the asphalt mixture is not considered in the design process of the mix proportion of the asphalt mixture in China, so that the anti-sliding capacity of many expressways is insufficient after long-term use, and the potential hazards of traffic accidents are increased. Therefore, it is necessary to invent a design method of high-friction asphalt mixture mix proportion based on theoretical calculation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a mix proportion design method of a high-friction asphalt mixture aiming at the defects of the prior art. The method estimates the anti-skid performance of the asphalt mixture by constructing the depth estimation model, has stronger purposiveness compared with the traditional method, and is easier to ensure that the designed asphalt mixture has good anti-skid performance.
In order to solve the technical problems, the invention adopts the technical scheme that: a mix proportion design method of a high-friction asphalt mixture is characterized by comprising the following steps:
step one, determining the construction depth of the high-friction asphalt mixture to be designed according to the actual engineering requirements of road materials;
selecting coarse aggregates with CAAT being more than or equal to 7100mm, Q being less than or equal to 15% and grain size being more than 2.36mm as the coarse aggregates with excellent anti-skid performance, wherein CAAT is a comprehensive index of surface morphological characteristics of the coarse aggregates, CAAT is 0.5 Ai +10 Tr, Ai is an angular index of the coarse aggregates, Tr is a surface texture index of the coarse aggregates, units of Ai and Tr are both mm, and Ai and Tr are both measured by an image scanning method of the coarse aggregates by using an AIMS aggregate imaging system; q is the abrasion value of the coarse aggregate, and is measured by the los Angeles abrasion test method;
step three, designing the gradation of the high-friction asphalt mixture according to the requirements of the construction technical specifications of the asphalt pavement of the highway, and blending the coarse aggregate with excellent anti-skid performance, the machine-made sand and the mineral powder selected in the step two according to the gradation to obtain mineral aggregate;
fourthly, estimating the construction depth of the asphalt mixture under the gradation condition designed in the third step according to the anti-skid performance estimation model of the asphalt mixture; if the estimated construction depth of the asphalt mixture under the grading design condition meets the actual engineering requirements of the road material, determining the optimal asphalt dosage of the mineral aggregate under the grading design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the dosage to obtain the asphalt mixture; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the redesigned gradation;
the estimation model of the anti-skid performance of the asphalt mixture is as follows: ETD is 0.0793MS-0.0108P4.75+0.0687Cc-0.0098Cu(ii) a Wherein ETD is the estimated construction depth of the asphalt mixture, and the unit is mm; MS is the maximum nominal grain diameter of mineral aggregate in the asphalt mixture, and the unit is mm; p4.75The passing rate of a 4.75mm sieve pore of mineral aggregate in the asphalt mixture is obtained; ccIs a coefficient of curvature, Cc＝(D30)2/(D10*D60)，CuIs a coefficient of uniformity, Cu＝D60/D10，D10The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 10 percent is in mm; d30The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 30 percent is in mm; d60The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 60 percent is in mm;
step five, carrying out an indoor long-term anti-sliding performance test on the asphalt mixture prepared in the step four, wherein if the asphalt mixture subjected to the indoor long-term anti-sliding performance test meets the following requirements: if the swing value is greater than 50 and the construction depth is greater than 0.7mm, entering a sixth step; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the redesigned gradation;
step six, carrying out a road performance test on the asphalt mixture prepared in the step four, and if the road performance test result meets the technical specification requirement of road asphalt pavement construction, obtaining a high-friction-resistance asphalt mixture with a swing value BPN larger than 70 and a construction depth meeting the actual engineering requirement of a road material; otherwise, preparing the mineral aggregate by adopting the higher-grade asphalt until the road performance of the asphalt mixture meets the technical specification requirement of the construction of the asphalt road surface of the highway.
The mix proportion design method of the high-friction asphalt mixture is characterized in that the construction depth of the high-friction asphalt mixture to be designed in the step one is not less than 1.0 mm.
The mix proportion design method of the high-friction asphalt mixture is characterized in that in the fifth step, equipment for performing an indoor long-term anti-slip performance test on the asphalt mixture is an abrasion tester, and the specific test process is as follows: and (3) loading the asphalt mixture for 15 ten thousand times, applying 0.7MPa standard axle load each time, and then measuring the swing value and the construction depth of the loaded asphalt mixture.
The mix proportion design method of the high-friction asphalt mixture is characterized in that the road performance test in the sixth step comprises a high-temperature rutting test, a low-temperature trabecular bending test and a water immersion marshall test.
Compared with the prior art, the invention has the following advantages:
1. the design method provided by the invention fully considers the anti-skid performance of the asphalt mixture, simultaneously considers other road performance, provides a complete design program, has high repeatability, and can be successfully applied to entity engineering.
2. The design method provided by the invention can be used for estimating the anti-skid performance of the asphalt mixture by constructing the depth estimation model, has stronger purposiveness compared with the traditional method, and is easier to ensure that the designed asphalt mixture has good anti-skid performance.
The present invention will be described in further detail with reference to examples.
Detailed Description
The high-friction asphalt mixture mix proportion design method provided by the invention comprises the following steps of performing a high-temperature rutting test, a low-temperature small beam bending test and a water immersion marshall test, which are all conventional tests in the field. The high-temperature rutting test is carried out according to T0719-2011 in road engineering asphalt and asphalt mixture test specification (JTG E20-2011), the low-temperature trabecular bending test is carried out according to T0715-2011 in road engineering asphalt and asphalt mixture test specification (JTG E20-2011), and the water-soaking Marshall test is carried out according to T0730-2011 in road engineering asphalt and asphalt mixture test specification (JTG E20-2011).
Example 1
The mix proportion design method of the high-friction asphalt mixture comprises the following steps:
step one, determining the construction depth of the high-friction asphalt mixture to be designed according to the actual engineering requirements of road materials;
in the embodiment, the actual engineering requirements of the road material require that the construction depth of the high-friction asphalt mixture to be designed is not less than 1.0 mm;
selecting coarse aggregates with CAAT being more than or equal to 7100mm, Q being less than or equal to 15% and grain size being more than 2.36mm as the coarse aggregates with excellent anti-skid performance, wherein CAAT is a comprehensive index of surface morphological characteristics of the coarse aggregates, CAAT is 0.5 Ai +10 Tr, Ai is an angular index of the coarse aggregates, Tr is a surface texture index of the coarse aggregates, units of Ai and Tr are both mm, and Ai and Tr are both measured by an image scanning method of the coarse aggregates by using an AIMS aggregate imaging system; q is the abrasion value of the coarse aggregate, and is measured by the los Angeles abrasion test method;
in this example, the results of coarse aggregate testing are shown in table 1.
TABLE 1 Main technical indices of aggregates
| Test items | Unit of | Test results | Test standards | Test method |
| Stone crush value | ％ | 14.75 | ≤25 | T0316－2005 |
| Firmness of use | ％ | 0.3 | ≤12 | T0314－2000 |
| Grinding value of stone | - | 43 | ≥39 | T0321－2005 |
| Los Angeles abrasion number | ％ | 12.72 | ≤15 | T0317－2005 |
| Ai | mm | 2213.5 | ≥2100 | - |
| Tr | mm | 635.4 | ≥200 | - |
| CAAT | mm | 7460.7 | ≥7100 | - |
Step three, designing the gradation of the high-friction asphalt mixture according to the requirements of the construction technical specifications of the asphalt pavement of the highway, and then blending the coarse aggregate with excellent anti-skid performance, the machine-made sand and the mineral powder in the step two according to the gradation to obtain mineral aggregate;
in this example, the gradation of the high-friction asphalt mixture is shown in table 2.
TABLE 2 gradation of high friction resistance asphalt mixture
| Screen hole (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 100 | 95 | 54.8 | 28.0 | 28.0 | 19.8 | 14.1 | 10.0 | 7.1 | 5.0 |
Step four, evaluating the construction depth of the asphalt mixture under the grading design condition in the step three according to an asphalt mixture anti-skid performance estimation model, if the construction depth of the asphalt mixture under the grading design condition meets the actual engineering requirements of road materials, determining the optimal asphalt using amount of mineral aggregate under the grading design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the using amount to obtain the asphalt mixture; otherwise, returning to the step of redesigning the gradation of the high-friction-resistance asphalt mixture, preparing the mineral aggregate according to the redesigned gradation until the construction depth of the mineral aggregate prepared under the gradation condition meets the actual engineering requirements of the road material, then determining the optimal asphalt dosage of the mineral aggregate under the gradation design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the dosage to obtain the asphalt mixture;
the estimation model of the anti-skid performance of the asphalt mixture is as follows: ETD is 0.0793MS-0.0108P4.75+0.0687Cc-0.0098Cu(ii) a Wherein ETD is the estimated construction depth of the asphalt mixture, and the unit is mm; MS is bituminous mixture middlingThe maximum nominal grain diameter of the material is mm; p4.75The passing rate of a 4.75mm sieve pore of mineral aggregate in the asphalt mixture is obtained; ccIs a coefficient of curvature, Cc＝(D30)2/(D10*D60)，CuIs a coefficient of uniformity, Cu＝D60/D10，D10The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 10 percent is in mm; d30The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 30 percent is in mm; d60The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 60 percent is in mm;
in this embodiment, the parameters for calculation are: MS 16mm, P4.7528.0% of CcIs 23.75, Cu95, the predicted depth of formation is 1.67mm (the predicted depth of formation is greater than 1.0mm), and the optimum asphalt dosage is 5.0%.
Step five, carrying out an indoor long-term anti-sliding performance test on the asphalt mixture prepared in the step four, and entering the step six if the construction depth of the asphalt mixture subjected to the indoor long-term anti-sliding performance test meets the standard requirements that the swing value is not less than 50BPN and the construction depth is not less than 0.70 mm; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the gradation;
in this embodiment, the equipment for performing the indoor long-term anti-skid performance test on the asphalt mixture is an abrasion tester, and the specific test process is as follows: and (3) loading the asphalt mixture for 15 ten thousand times, applying 0.7MPa standard axle load each time, and then measuring the swing value and the construction depth of the loaded asphalt mixture.
In the embodiment, a long-term abrasion test is carried out on the rut plate made of the asphalt mixture by using an abrasion tester, and the swing value and the structural depth of the rut plate after 15 ten thousand times of standard axle load action at 0.7MPa are measured, wherein the swing value is 57BPN, the structural depth is 0.76mm, and the result meets the standard requirements that the swing value is not less than 50BPN and the structural depth is not less than 0.70 mm;
step six, carrying out a road performance test on the asphalt mixture prepared in the step four, wherein the road performance test comprises a high-temperature track test, a low-temperature trabecula bending test and a water immersion marshall test, and if the road performance test result requires the construction technical specification of the highway asphalt pavement, the high-friction-resistance asphalt mixture with the swing value BPN larger than 70 and the construction depth meeting the design requirement of the step one is obtained; otherwise, preparing the mineral aggregate by adopting the higher-grade asphalt until the road performance of the asphalt mixture meets the technical specification requirement of the construction of the asphalt road surface of the highway.
The results of the asphalt road performance test are shown in table 3.
TABLE 3 road Performance test results for asphalt mixtures
| Road performance test project | Unit of | Test results | Test standards | Test standards |
| Rut test results | Sub/mm | 5575 | ≥3000 | T0719-2011 |
| Freeze-thaw split strength ratio | ％ | 94.27 | ≥80 | T0716-2011 |
| Low temperature bending failure strain | - | 4305 | ≥2500 | T0715-2011 |
The formulation of the high friction asphalt mixture determined in this example is shown in table 4.
Table 4 mixing ratio of high friction asphalt mixture (oil-stone ratio 5.0%) determined in example 1
Example 2
The mix proportion design method of the high-friction asphalt mixture comprises the following steps:
step one, determining the construction depth of the high-friction asphalt mixture to be designed according to the actual engineering requirements of road materials;
in the embodiment, the actual engineering requirements of the road material require that the construction depth of the high-friction asphalt mixture to be designed is not less than 1.0 mm;
selecting coarse aggregates with CAAT being more than or equal to 7100mm, Q being less than or equal to 15% and grain size being more than 2.36mm as the coarse aggregates with excellent anti-skid performance, wherein CAAT is a comprehensive index of surface morphological characteristics of the coarse aggregates, CAAT is 0.5 Ai +10 Tr, Ai is an angular index of the coarse aggregates, Tr is a surface texture index of the coarse aggregates, units of Ai and Tr are both mm, and Ai and Tr are both measured by an image scanning method of the coarse aggregates by using an AIMS aggregate imaging system; q is the abrasion value of the coarse aggregate, and is measured by the los Angeles abrasion test method;
in this example, the results of coarse aggregate testing are shown in table 5.
TABLE 5 Main technical indices of aggregates
| Test items | Unit of | Test results | Test standards | Test method |
| Stone crush value | ％ | 15.35 | ≤25 | T0316－2005 |
| Los Angeles abrasion number | ％ | 13.42 | ≤15 | T0317－2005 |
| Firmness of use | ％ | 0.4 | ≤12 | T0314－2000 |
| Grinding value of stone | － | 44 | ≥39 | T0321－2005 |
| Ai | mm | 2178.2 | ≥2100 | － |
| Tr | mm | 620.2 | ≥200 | － |
| CAAT value | mm | 7291.1 | ≥7100 | － |
Step three, designing the gradation of the high-friction asphalt mixture according to the requirements of the construction technical specifications of the asphalt pavement of the highway, and then blending the coarse aggregate with excellent anti-skid performance, the machine-made sand and the mineral powder in the step two according to the gradation to obtain mineral aggregate;
in this example, the gradation of the high-friction asphalt mixture is shown in table 6.
TABLE 6 gradation of high friction resistance asphalt mixture
| Screen hole (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 100 | 95.0 | 60.0 | 40.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
Step four, evaluating the construction depth of the asphalt mixture under the grading design condition in the step three according to an asphalt mixture skid resistance pre-estimation model, if the construction depth of the asphalt mixture under the grading design condition meets the actual engineering requirements of road materials, determining the optimal asphalt using amount of mineral aggregate under the grading design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the using amount to obtain the asphalt mixture; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the gradation; until the construction depth of the mineral aggregate prepared under the grading condition meets the actual engineering requirements of the road material, determining the optimal asphalt dosage of the mineral aggregate under the grading design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the dosage to obtain an asphalt mixture;
the estimation model of the anti-skid performance of the asphalt mixture is as follows: ETD is 0.0793MS-0.0108P4.75+0.0687Cc-0.0098Cu(ii) a Wherein ETD is the estimated construction depth of the asphalt mixture, and the unit is mm; MS is the maximum nominal grain diameter of mineral aggregate in the asphalt mixture, and the unit is mm; p4.75The passing rate of a 4.75mm sieve pore of mineral aggregate in the asphalt mixture is obtained; ccIs a coefficient of curvature, Cc＝(D30)2/(D10*D60)，CuIs a coefficient of uniformity, Cu＝D60/D10，D10The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 10 percent is in mm; d30The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 30 percent is in mm; d60The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 60 percent is in mm;
the parameters for calculation in this embodiment are: MS 16mm, P4.7540.0% of CcIs 4.43; cu31.67, the estimated structure depth is 0.83 mm.
In this embodiment, the estimated structural depth is less than 1.0mm, and does not meet the requirements. Therefore, the step three is required to be returned, the gradation is redesigned, according to the industry experience, the gradation is adjusted by reducing the passing rate of the 4.75mm sieve holes, and the adjusted gradation is shown in table 7.
TABLE 7 gradation of passing rate of corresponding sieve holes
| Screen hole (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 100.0 | 95.0 | 60.0 | 23.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
In this embodiment, the parameters for calculation after adjusting the gradation are: MS is 16 mm; p4.7523.0% of CcIs 7.92; cu31.67, the estimated structure depth is 1.25 mm. The requirements are met, so that the Marshall test is adopted to determine that the optimal asphalt consumption of the mineral aggregate under the grading design condition is 5.1%;
step five, carrying out an indoor long-term anti-sliding performance test on the asphalt mixture prepared in the step four, and entering the step six if the construction depth of the asphalt mixture subjected to the indoor long-term anti-sliding performance test meets the conditions that the swing value is more than 50 and the construction depth is more than 0.7 mm; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the redesigned gradation;
in this embodiment, the equipment for performing the indoor long-term anti-skid performance test on the asphalt mixture is an abrasion tester, and the specific test process is as follows: and (3) loading the asphalt mixture for 15 ten thousand times, applying 0.7MPa standard axle load each time, and then measuring the swing value and the construction depth of the loaded asphalt mixture.
In the embodiment, a long-term abrasion test is carried out on the rut plate made of the asphalt mixture by using an abrasion tester, and the swing value and the structural depth of the rut plate after 15 ten thousand times of standard axle load action at 0.7MPa are measured, wherein the swing value is 57BPN, the structural depth is 0.76mm, and the result meets the standard requirements that the swing value is not less than 50BPN and the structural depth is not less than 0.70 mm;
step six, carrying out a road performance test on the asphalt mixture prepared in the step four, wherein the road performance test comprises a high-temperature track test, a low-temperature trabecular bending test and a water immersion marshall test, and if the road performance test result requires the construction technical specification of the highway asphalt pavement, obtaining the high-friction-resistance asphalt mixture with the swing value BPN larger than 70 and the construction depth meeting the design requirement; otherwise, preparing the mineral aggregate by adopting the higher-grade asphalt until the road performance of the asphalt mixture meets the technical specification requirement of the construction of the asphalt road surface of the highway.
The results of the asphalt road performance test are shown in Table 8.
TABLE 8 road Performance test results for asphalt mixtures
| Road performance test project | Unit of | Test results | Test standards | Test standards |
| Rut test results | Sub/mm | 5400 | ≥3000 | T0719-2011 |
| Freeze-thaw split strength ratio | ％ | 95.2 | ≥80 | T0716-2011 |
| Low temperature bending failure strain | 4530 | ≥2500 | T0715-2011 |
The formulation of the high friction asphalt mixture determined in this example is shown in table 9.
TABLE 9 compounding ratio of high-friction asphalt mixture (oil-stone ratio 5.1%) determined in example 2
| Screen hole (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Passage Rate (%) | 100.0 | 95.0 | 60.0 | 23.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (4)
1. A mix proportion design method of a high-friction asphalt mixture is characterized by comprising the following steps:
step one, determining the construction depth of the high-friction asphalt mixture to be designed according to the actual engineering requirements of road materials;
selecting coarse aggregates with CAAT not less than 7100mm, Q not more than 15% and grain size more than 2.36mm as the coarse aggregates with excellent anti-skid performance; the CAAT is a comprehensive index of surface morphological characteristics of the coarse aggregate, the CAAT is 0.5 Ai +10 Tr, the Ai is an angular index of the coarse aggregate, the Tr is a surface texture index of the coarse aggregate, units of the Ai and the Tr are both mm, and the Ai and the Tr are both measured by an image scanning method of the coarse aggregate by using an AIMS aggregate imaging system; q is the abrasion value of the coarse aggregate, and is measured by the los Angeles abrasion test method;
step three, designing the gap gradation of the high-friction asphalt mixture according to the requirements of the construction technical specifications of the asphalt pavement of the highway, and blending the coarse aggregate with excellent anti-skid performance, the machine-made sand and the mineral powder selected in the step two according to the gap gradation to obtain mineral aggregate;
fourthly, estimating the construction depth of the asphalt mixture under the gradation condition designed in the third step according to the anti-skid performance estimation model of the asphalt mixture; if the estimated construction depth of the asphalt mixture under the grading design condition meets the actual engineering requirements of the road material, determining the optimal asphalt dosage of the mineral aggregate under the grading design condition by adopting a Marshall test, and then blending the mineral aggregate and the asphalt according to the dosage to obtain the asphalt mixture; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the redesigned gradation;
the estimation model of the anti-skid performance of the asphalt mixture is as follows: ETD is 0.0793MS-0.0108P4.75+0.0687Cc-0.0098Cu(ii) a Wherein ETD is the estimated construction depth of the asphalt mixture, and the unit is mm; MS is the maximum nominal grain diameter of mineral aggregate in the asphalt mixture, and the unit is mm; p4.75The passing rate of a 4.75mm sieve pore of mineral aggregate in the asphalt mixture is obtained; ccIs a coefficient of curvature, Cc＝(D30)2/(D10*D60)，CuIs a coefficient of uniformity, Cu＝D60/D10，D10The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 10 percent is in mm; d30The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 30 percent is in mm; d60The size of a corresponding sieve pore of mineral aggregate in the asphalt mixture under the condition that the passing rate is 60 percent is in mm;
step five, carrying out an indoor long-term anti-sliding performance test on the asphalt mixture prepared in the step four, wherein if the asphalt mixture subjected to the indoor long-term anti-sliding performance test meets the following requirements: if the swing value is greater than 50 and the construction depth is greater than 0.7mm, entering a sixth step; otherwise, returning to the step of designing the gradation of the high-friction asphalt mixture and preparing the mineral aggregate according to the redesigned gradation;
step six, carrying out a road performance test on the asphalt mixture prepared in the step four, and if the road performance test result meets the technical specification requirement of road asphalt pavement construction, obtaining a high-friction-resistance asphalt mixture with a swing value BPN larger than 70 and a construction depth meeting the actual engineering requirement of a road material; otherwise, preparing the mineral aggregate by adopting the higher-grade asphalt until the road performance of the asphalt mixture meets the technical specification requirement of the construction of the asphalt road surface of the highway.
2. The method as claimed in claim 1, wherein the construction depth of the high friction asphalt mixture to be designed in the first step is not less than 1.0 mm.
3. The mix proportion design method of the high-friction asphalt mixture according to claim 1, wherein the equipment for performing the indoor long-term anti-slip performance test on the asphalt mixture in the step five is an abrasion tester, and the specific test process is as follows: and (3) loading the asphalt mixture for 15 ten thousand times, applying 0.7MPa standard axle load each time, and then measuring the swing value and the construction depth of the loaded asphalt mixture.
4. The method for designing the mix proportion of the high-friction asphalt mixture according to claim 1, wherein the pavement performance tests in the sixth step comprise a high-temperature rutting test, a low-temperature trabecular bending test and a water-immersed Marshall test.
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