CN107220460A - A kind of mixing proportion design method of high frictional resistance asphalt - Google Patents
A kind of mixing proportion design method of high frictional resistance asphalt Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 153
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000013461 design Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 claims abstract description 64
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 51
- 239000011707 mineral Substances 0.000 claims abstract description 51
- 238000011056 performance test Methods 0.000 claims abstract description 19
- 230000007774 longterm Effects 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 46
- 239000000203 mixture Substances 0.000 claims description 14
- FVFVNNKYKYZTJU-UHFFFAOYSA-N 6-chloro-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(Cl)=N1 FVFVNNKYKYZTJU-UHFFFAOYSA-N 0.000 claims description 12
- 238000005299 abrasion Methods 0.000 claims description 11
- 238000011068 loading method Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000007654 immersion Methods 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 238000007796 conventional method Methods 0.000 abstract description 3
- 206010039203 Road traffic accident Diseases 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 244000050510 Cunninghamia lanceolata Species 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000007655 standard test method Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
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Abstract
The invention discloses a kind of mixing proportion design method of high frictional resistance asphalt, comprise the following steps：First, the construction depth of high frictional resistance asphalt to be designed is determined；2nd, the coarse aggregate of antiskid function admirable is chosen；3rd, design level is matched somebody with somebody, and is then mixed and is made into mineral aggregate；4th, the construction depth of asphalt is estimated according to asphalt antiskid performance prediction model, is required if it meets, prepares asphalt；Otherwise return to step three；5th, indoor long-term skid resistance is carried out to asphalt to be tested, and required if it meets, into step 6；Otherwise return to step three；6th, pavement performance test is carried out to asphalt, is required if it meets, obtain high frictional resistance asphalt；Otherwise, using the pitch of greater degree.The present invention is estimated by construction depth prediction model to the antiskid performance of asphalt, is had stronger purpose compared with conventional method, more be can guarantee that the asphalt designed has good antiskid performance.
Description
Technical field
The invention belongs to asphalt pavement technique field, and in particular to a kind of mix-design side of high frictional resistance asphalt
Method.
Background technology
With the fast development of China's highway cause, the threat of the traffic accident faced is also more and more, and shadow
The key factor for ringing road traffic accident is exactly the antiskid performance on road surface.Good pavement skid resistance condition can reduce traffic accident
Generation, control pavement skid resistance condition be reduce traffic accident occur most directly, most efficient method.However, China's pitch
There is no the antiskid performance for asphaltic road-mix surface course to account for during mix proportion design, so as to cause many height
Anti-slide performance is not enough after long-term use for fast highway, increases hidden peril of accident.Therefore, it is necessary to invent a kind of based on theoretical meter
The high frictional resistance asphalt mixture mixing proportion design method calculated.
The content of the invention
The technical problems to be solved by the invention are that there is provided a kind of high frictional resistance pitch for above-mentioned the deficiencies in the prior art
The mixing proportion design method of compound.This method is carried out pre- by construction depth prediction model to the antiskid performance of asphalt
Estimate, there is stronger purpose compared with conventional method, be more easy to ensure that the asphalt designed has good antiskid performance.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of cooperation of high frictional resistance asphalt
Compare design method, it is characterised in that this method comprises the following steps：
Step 1: being required according to the Practical Project of pavement material, the construction of high frictional resistance asphalt to be designed is determined
Depth；
Step 2: it is excellent as antiskid performance to choose the coarse aggregate of CAAT >=7100mm, Q≤15% and particle diameter more than 2.36mm
Good coarse aggregate, the CAAT is the surface morphology characteristics overall target of coarse aggregate, and CAAT=0.5*Ai+10*Tr, Ai is rough set
The corner angle index of material, Tr is the surface texture index of coarse aggregate, Ai and Tr unit be mm, Ai and Tr by using
AIMS gather materials imaging system to coarse aggregate carry out image scanning method measure；The Q is the wearing valve of coarse aggregate, and Q passes through Lip river
China fir rock abrasion test method is measured；
Step 3: the level for designing high frictional resistance asphalt according to the requirement of standard specification for construction and acceptance of highway asphalt pavement is matched somebody with somebody,
Then match somebody with somebody according to this grade and mix matching somebody with somebody by the coarse aggregate and Machine-made Sand and miberal powder of antiskid function admirable selected in step 2,
Obtain mineral aggregate；
Step 4: under the conditions of the level according to designed by being estimated in step 3 asphalt antiskid performance prediction model is matched somebody with somebody
Asphalt construction depth；If the construction depth for the asphalt estimated under the conditions of the gradation design is met
The requirement of pipeline material Practical Project, then determine pitch optimum amount of the mineral aggregate under the conditions of gradation design, so using Marshall Test
Mixed afterwards according to the consumption with mineral aggregate and pitch, obtain asphalt；Otherwise, return to step three redesigns high frictional resistance pitch and mixed
The level for closing material is matched somebody with somebody, and according to redesign level with preparing mineral aggregate；
The asphalt antiskid performance prediction model is：ETD=0.0793MS-0.0108P4.75+0.0687Cc-
0.0098Cu；Wherein, ETD is the construction depth for the asphalt estimated, and unit is mm；MS is asphalt Mineral Material
Nominal maximum aggregate size, unit is mm；P4.75For the 4.75mm sieve aperture percent of pass of asphalt Mineral Material；CcFor coefficient of curvature, Cc
=(D30)2/(D10*D60), CuFor coefficient of uniformity, Cu=D60/D10, D10In percent of pass it is 10% for asphalt Mineral Material
Corresponding screen size under part, unit is mm；D30In percent of pass it is corresponding sieve under the conditions of 30% for asphalt Mineral Material
Hole size, unit is mm；D60In percent of pass it is corresponding screen size under the conditions of 60% for asphalt Mineral Material, unit is
mm；
Step 5: indoor long-term skid resistance is carried out to asphalt prepared in step 4 to be tested, if through interior
Asphalt after long-term antiskid performance test is met：Pendulum value is more than 50, and construction depth is more than 0.7mm, then into step
Six；Otherwise, return to step three redesigns the level of high frictional resistance asphalt and matched somebody with somebody, and according to redesign level with preparing ore deposit
Material；
Step 6: pavement performance test is carried out to asphalt prepared in step 4, if pavement performance test knot
Fruit meets standard specification for construction and acceptance of highway asphalt pavement requirement, then obtains pendulum value BPN and meet pavement material reality more than 70, construction depth
The high frictional resistance asphalt of border engine request；Otherwise, mineral aggregate is prepared using the pitch of greater degree, until asphalt
Pavement performance meets standard specification for construction and acceptance of highway asphalt pavement requirement.
The mixing proportion design method of above-mentioned a kind of high frictional resistance asphalt, it is characterised in that to be designed in step one
High frictional resistance asphalt construction depth be not less than 1.0mm.
The mixing proportion design method of above-mentioned a kind of high frictional resistance asphalt, it is characterised in that to pitch in step 5
The equipment that compound carries out indoor long-term skid resistance and can tested is abrasion instrument, and specific process of the test is：Asphalt is carried out
150000 loadings, apply 0.7MPa standard axle loads every time, then determine the pendulum value and construction depth of asphalt after loading.
A kind of mixing proportion design method of above-mentioned high frictional resistance asphalt, it is characterised in that road described in step 6
Include high-temperature rutting test, low-temperature bending test and immersion Marshall test with performance test.
The present invention has advantages below compared with prior art：
1st, the design method that the present invention is provided, has taken into full account the antiskid performance of asphalt, while also having taken into account it
His pavement performance, it is proposed that complete design program, repeatability is high, can be applied successfully to entity project.
2nd, the design method that the present invention is provided is carried out by construction depth prediction model to the antiskid performance of asphalt
Estimate, there is stronger purpose compared with conventional method, be more easy to ensure that the asphalt designed has good antiskid performance.
The present invention is described in further detail with reference to embodiment.
Embodiment
A kind of high frictional resistance asphalt mixture mixing proportion design method of the present invention, high-temperature rutting test, low temperature girder
Bend test, immersion Marshall test are this area routine test.Wherein high-temperature rutting test foundation《Highway engineering pitch and
Asphalt Mixture Experiment code》T0719-2011 in (JTG E20-2011) is tested, low-temperature bending test foundation
《Highway engineering pitch and Asphalt Mixture Experiment code》T0715-2011 in (JTG E20-2011) is tested, and soak horse
Xie Er test basis《Highway engineering pitch and Asphalt Mixture Experiment code》T0730-2011 in (JTG E20-2011) enters
Row test.
Embodiment 1
The mixing proportion design method of the high frictional resistance asphalt of the present embodiment comprises the following steps：
Step 1: being required according to the Practical Project of pavement material, the construction of high frictional resistance asphalt to be designed is determined
Depth；
In the present embodiment, the Practical Project of pavement material requires the construction depth of high frictional resistance asphalt to be designed not
Less than 1.0mm；
Step 2: it is excellent as antiskid performance to choose the coarse aggregate of CAAT >=7100mm, Q≤15% and particle diameter more than 2.36mm
Good coarse aggregate, the CAAT is the surface morphology characteristics overall target of coarse aggregate, and CAAT=0.5*Ai+10*Tr, Ai is rough set
The corner angle index of material, Tr is the surface texture index of coarse aggregate, Ai and Tr unit be mm, Ai and Tr by using
AIMS gather materials imaging system to coarse aggregate carry out image scanning method measure；The Q is the wearing valve of coarse aggregate, and Q passes through Lip river
China fir rock abrasion test method is measured；
In the present embodiment, coarse aggregate testing result is as shown in table 1.
The key technical indexes that table 1 gathers materials
| Pilot project | Unit | Result of the test | Testing standard | Test method |
| Building stones crush values | % | 14.75 | ≤25 | T0316-2005 |
| Robustness | % | 0.3 | ≤12 | T0314-2000 |
| Polished stone value (P.S.V.) | - | 43 | ≥39 | T0321-2005 |
| Los Angeles wearing valve | % | 12.72 | ≤15 | T0317-2005 |
| Ai | mm | 2213.5 | ≥2100 | - |
| Tr | mm | 635.4 | ≥200 | - |
| CAAT | mm | 7460.7 | ≥7100 | - |
Step 3: the level for designing high frictional resistance asphalt according to the requirement of standard specification for construction and acceptance of highway asphalt pavement is matched somebody with somebody,
Then mineral aggregate is obtained with mixing coarse aggregate and Machine-made Sand and miberal powder with antiskid function admirable described in step 2 according to this grade；
In the present embodiment, the level of high frictional resistance asphalt is with as shown in table 2.
The level of the high frictional resistance asphalt of table 2 is matched somebody with somebody
| Sieve aperture (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 100 | 95 | 54.8 | 28.0 | 28.0 | 19.8 | 14.1 | 10.0 | 7.1 | 5.0 |
Step 4: being dripped according to asphalt antiskid performance prediction model appraisal procedure three under the conditions of gradation design
The construction depth of blue or green compound, if the construction depth of asphalt meets the actual work of pavement material under the conditions of the gradation design
Range request, then determine pitch optimum amount of the mineral aggregate under the conditions of gradation design, then according to the consumption using Marshall Test
Mix with mineral aggregate and pitch, obtain asphalt；Otherwise, return to step three redesigns the level of high frictional resistance asphalt and matched somebody with somebody,
And according to redesign level with preparing mineral aggregate, until the construction depth for the mineral aggregate being made under the conditions of this grade is matched somebody with somebody meets road material
Expect Practical Project requirement, pitch optimum amount of the mineral aggregate under the conditions of the gradation design is then determined using Marshall Test, it
Mixed afterwards according to the consumption with mineral aggregate and pitch, obtain asphalt；
The asphalt antiskid performance prediction model is：ETD=0.0793MS-0.0108P4.75+0.0687Cc-
0.0098Cu；Wherein, ETD is the construction depth for the asphalt estimated, and unit is mm；MS is asphalt Mineral Material
Nominal maximum aggregate size, unit is mm；P4.75For the 4.75mm sieve aperture percent of pass of asphalt Mineral Material；CcFor coefficient of curvature, Cc
=(D30)2/(D10*D60), CuFor coefficient of uniformity, Cu=D60/D10, D10In percent of pass it is 10% for asphalt Mineral Material
Corresponding screen size under part, unit is mm；D30In percent of pass it is corresponding sieve under the conditions of 30% for asphalt Mineral Material
Hole size, unit is mm；D60In percent of pass it is corresponding screen size under the conditions of 60% for asphalt Mineral Material, unit is
mm；
In the present embodiment, calculating is respectively with each parameter：MS is 16mm, P4.75For 28.0%, CcFor 23.75, CuFor 95,
It is 1.67mm (estimating construction depth more than 1.0mm) to estimate construction depth, and asphalt optimum content is 5.0%.
Step 5: indoor long-term skid resistance is carried out to asphalt prepared in step 4 to be tested, if through interior
The construction depth of asphalt after long-term antiskid performance test meets pendulum value and is not less than not less than 50BPN, construction depth
0.70mm standard requirement, then into step 6；Otherwise, return to step three redesigns the level of high frictional resistance asphalt and matched somebody with somebody,
And according to the level with preparing mineral aggregate；
In the present embodiment, the equipment that indoor long-term skid resistance is carried out to asphalt to be tested is abrasion instrument, specific examination
The process of testing is：150,000 loadings are carried out to asphalt, apply 0.7MPa standard axle loads every time, pitch after loading is then determined
The pendulum value and construction depth of compound.
The rut plate that the present embodiment is made using abrasion instrument to asphalt carries out long-term abrasion test, determines
0.7MPa standard axle loads act on the pendulum value and construction depth of rut plate after 150,000 times, and pendulum value is 57BPN, and construction depth is
0.76mm, as a result meets pendulum value not less than 50BPN, standard requirement of the construction depth not less than 0.70mm；
Step 6: carrying out pavement performance test to asphalt prepared in step 4, pavement performance test includes
High-temperature rutting test, low-temperature bending test and immersion Marshall test, if pavement performance test result asphalt highway
Construction technique normalizing requirement, then obtain pendulum value BPN more than 70, and the high frictional resistance pitch that construction depth meets step one design requirement is mixed
Close material；Otherwise, mineral aggregate is prepared using the pitch of greater degree, until the pavement performance of asphalt meets asphalt highway
Construction technique normalizing requirement.
Asphalt Mixture Performance result of the test is as shown in table 3.
The Asphalt Mixture Performance result of the test of table 3
| Pavement performance test project | Unit | Result of the test | Testing standard | Testing standard |
| Wheel tracking test result | Secondary/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 match ratio of the high frictional resistance asphalt determined by the present embodiment is as shown in table 4.
The match ratio (bitumen aggregate ratio 5.0%) for the high frictional resistance asphalt that the embodiment 1 of table 4 is determined
Embodiment 2
The mixing proportion design method of the high frictional resistance asphalt of the present embodiment comprises the following steps：
Step 1: being required according to the Practical Project of pavement material, the construction of high frictional resistance asphalt to be designed is determined
Depth；
In the present embodiment, the Practical Project of pavement material requires the construction depth of high frictional resistance asphalt to be designed not
Less than 1.0mm；
Step 2: it is excellent as antiskid performance to choose the coarse aggregate of CAAT >=7100mm, Q≤15% and particle diameter more than 2.36mm
Good coarse aggregate, the CAAT is the surface morphology characteristics overall target of coarse aggregate, and CAAT=0.5*Ai+10*Tr, Ai is rough set
The corner angle index of material, Tr is the surface texture index of coarse aggregate, Ai and Tr unit be mm, Ai and Tr by using
AIMS gather materials imaging system to coarse aggregate carry out image scanning method measure；The Q is the wearing valve of coarse aggregate, and Q passes through Lip river
China fir rock abrasion test method is measured；
In the present embodiment, coarse aggregate testing result is as shown in table 5.
The key technical indexes that table 5 gathers materials
| Pilot project | Unit | Result of the test | Testing standard | Test method |
| Building stones crush values | % | 15.35 | ≤25 | T0316-2005 |
| Los Angeles wearing valve | % | 13.42 | ≤15 | T0317-2005 |
| Robustness | % | 0.4 | ≤12 | T0314-2000 |
| Polished stone value (P.S.V.) | - | 44 | ≥39 | T0321-2005 |
| Ai | mm | 2178.2 | ≥2100 | - |
| Tr | mm | 620.2 | ≥200 | - |
| CAAT values | mm | 7291.1 | ≥7100 | - |
Step 3: the level for designing high frictional resistance asphalt according to the requirement of standard specification for construction and acceptance of highway asphalt pavement is matched somebody with somebody,
Then match somebody with somebody to mix the coarse aggregate and Machine-made Sand and miberal powder of antiskid function admirable described in step 2 to match somebody with somebody according to this grade and obtain mineral aggregate；
In the present embodiment, the level of high frictional resistance asphalt is with as shown in table 6.
The level of the high frictional resistance asphalt of table 6 is matched somebody with somebody
| Sieve aperture (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 100 | 95.0 | 60.0 | 40.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
Step 4: being assessed according to asphalt antiskid performance prediction model described in step 3 under the conditions of gradation design
The construction depth of asphalt, if the construction depth of asphalt meets pavement material reality under the conditions of the gradation design
Engine request, then determine pitch optimum amount of the mineral aggregate under the conditions of gradation design, then according to the use using Marshall Test
Amount is mixed with mineral aggregate and pitch, obtains asphalt；Otherwise, return to step three redesigns the level of high frictional resistance asphalt
Match somebody with somebody, and according to the level with preparing mineral aggregate；Until the construction depth for the mineral aggregate being made under the conditions of this grade is matched somebody with somebody meets pavement material reality
Border engine request, then determines pitch optimum amount of the mineral aggregate under the conditions of the gradation design using Marshall Test, presses afterwards
Mixed according to the consumption with mineral aggregate and pitch, obtain asphalt；
The asphalt antiskid performance prediction model is：ETD=0.0793MS-0.0108P4.75+0.0687Cc-
0.0098Cu；Wherein, ETD is the construction depth for the asphalt estimated, and unit is mm；MS is asphalt Mineral Material
Nominal maximum aggregate size, unit is mm；P4.75For the 4.75mm sieve aperture percent of pass of asphalt Mineral Material；CcFor coefficient of curvature, Cc
=(D30)2/(D10*D60), CuFor coefficient of uniformity, Cu=D60/D10, D10In percent of pass it is 10% for asphalt Mineral Material
Corresponding screen size under part, unit is mm；D30In percent of pass it is corresponding sieve under the conditions of 30% for asphalt Mineral Material
Hole size, unit is mm；D60In percent of pass it is corresponding screen size under the conditions of 60% for asphalt Mineral Material, unit is
mm；
Calculating parameter is respectively in the present embodiment：MS is 16mm, P4.75For 40.0%, CcFor 4.43；CuFor 31.67, in advance
Construction depth is estimated for 0.83mm.
In the present embodiment, construction depth is estimated less than 1.0mm, is unsatisfactory for requiring.Therefore return to step three is needed, redesign level
Match somebody with somebody, by industry experience, the present embodiment is matched somebody with somebody by reducing the percent of pass of 4.75mm sieve apertures to adjust level, the level after adjustment matches somebody with somebody such as table 7
It is shown.
7 grades of percent of pass with correspondence sieve aperture of table
| Sieve aperture (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 100.0 | 95.0 | 60.0 | 23.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
The calculating parameter after level is matched somebody with somebody is adjusted in the present embodiment is respectively：MS is 16mm；P4.75For 23.0%, CcFor 7.92；
CuFor 31.67, construction depth is estimated for 1.25mm.Meet and require, therefore determine that mineral aggregate is arranged in this grade using Marshall Test
Pitch optimum amount under the conditions of meter is 5.1%；
Step 5: indoor long-term skid resistance is carried out to asphalt prepared in step 4 to be tested, if through interior
The construction depth of asphalt after long-term antiskid performance test meets pendulum value more than 50, and construction depth is more than 0.7mm, then enters
Enter step 6；Otherwise, return to step three redesigns the level of high frictional resistance asphalt and matched somebody with somebody, and is prepared according to the level of redesign
Standby mineral aggregate；
In the present embodiment, the equipment that indoor long-term skid resistance is carried out to asphalt to be tested is abrasion instrument, specific examination
The process of testing is：150,000 loadings are carried out to asphalt, apply 0.7MPa standard axle loads every time, pitch after loading is then determined
The pendulum value and construction depth of compound.
The rut plate that the present embodiment is made using abrasion instrument to asphalt carries out long-term abrasion test, determines
0.7MPa standard axle loads act on the pendulum value and construction depth of rut plate after 150,000 times, and pendulum value is 57BPN, and construction depth is
0.76mm, as a result meets pendulum value not less than 50BPN, standard requirement of the construction depth not less than 0.70mm；
Step 6: carrying out pavement performance test to asphalt prepared in step 4, pavement performance test includes
High-temperature rutting test, low-temperature bending test and immersion Marshall test, if pavement performance test result asphalt highway
Construction technique normalizing requirement, then obtain pendulum value BPN more than 70, construction depth meets the high frictional resistance asphalt of design requirement；
Otherwise, mineral aggregate is prepared using the pitch of greater degree, until the pavement performance of asphalt meets asphalt highway construction
Demand of technical standard.
Asphalt Mixture Performance result of the test is as shown in table 8.
The Asphalt Mixture Performance result of the test of table 8
| Pavement performance test project | Unit | Result of the test | Testing standard | Testing standard |
| Wheel tracking test result | Secondary/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 match ratio of the high frictional resistance asphalt determined by the present embodiment is as shown in table 9.
The match ratio (bitumen aggregate ratio 5.1%) for the high frictional resistance asphalt that the embodiment 2 of table 9 is determined
| Sieve aperture (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| Percent of pass (%) | 100.0 | 95.0 | 60.0 | 23.0 | 20.0 | 18.0 | 15.0 | 10.0 | 9.0 | 8.0 |
It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions.It is every according to invention skill
Any simple modification, change and equivalence change that art is substantially made to above example, still fall within technical solution of the present invention
Protection domain in.
Claims (4)
1. a kind of mixing proportion design method of high frictional resistance asphalt, it is characterised in that this method comprises the following steps：
Step 1: being required according to the Practical Project of pavement material, the construction depth of high frictional resistance asphalt to be designed is determined；
Step 2: choosing the coarse aggregate of CAAT >=7100mm, Q≤15% and particle diameter more than 2.36mm is used as antiskid function admirable
Coarse aggregate；The CAAT is the surface morphology characteristics overall target of coarse aggregate, and CAAT=0.5*Ai+10*Tr, Ai is coarse aggregate
Corner angle index, Tr is the surface texture index of coarse aggregate, and Ai and Tr unit is mm, Ai and Tr by using AIMS collection
The method that material imaging system carries out image scanning to coarse aggregate is measured；The Q is the wearing valve of coarse aggregate, and Q is ground by Los Angeles
Consumption test method is measured；
Step 3: the level for designing high frictional resistance asphalt according to the requirement of standard specification for construction and acceptance of highway asphalt pavement is matched somebody with somebody, then
Match somebody with somebody according to this grade and mix matching somebody with somebody by the coarse aggregate and Machine-made Sand and miberal powder of antiskid function admirable selected in step 2, obtain
Mineral aggregate；
Step 4: estimating the drip under the conditions of designed level in step 3 is matched somebody with somebody according to asphalt antiskid performance prediction model
The construction depth of blue or green compound；If the construction depth for the asphalt estimated under the conditions of the gradation design meets road material
Expect Practical Project requirement, then pitch optimum amount of the mineral aggregate under the conditions of gradation design is determined using Marshall Test, then pressed
Mixed according to the consumption with mineral aggregate and pitch, obtain asphalt；Otherwise, return to step three redesigns high frictional resistance asphalt
Level match somebody with somebody, and according to redesign level with preparing mineral aggregate；
The asphalt antiskid performance prediction model is：ETD=0.0793MS-0.0108P4.75+0.0687Cc-
0.0098Cu；Wherein, ETD is the construction depth for the asphalt estimated, and unit is mm；MS is asphalt Mineral Material
Nominal maximum aggregate size, unit is mm；P4.75For the 4.75mm sieve aperture percent of pass of asphalt Mineral Material；CcFor coefficient of curvature, Cc
=(D30)2/(D10*D60), CuFor coefficient of uniformity, Cu=D60/D10, D10In percent of pass it is 10% for asphalt Mineral Material
Corresponding screen size under part, unit is mm；D30In percent of pass it is corresponding sieve under the conditions of 30% for asphalt Mineral Material
Hole size, unit is mm；D60In percent of pass it is corresponding screen size under the conditions of 60% for asphalt Mineral Material, unit is
mm；
Step 5: indoor long-term skid resistance is carried out to asphalt prepared in step 4 to be tested, if through indoor long-term
Asphalt after antiskid performance test is met：Pendulum value is more than 50, and construction depth is more than 0.7mm, then into step 6；It is no
Then, return to step three redesigns the level of high frictional resistance asphalt and matched somebody with somebody, and according to redesign level with preparing mineral aggregate；
Step 6: pavement performance test is carried out to asphalt prepared in step 4, if pavement performance test result is accorded with
Standard specification for construction and acceptance of highway asphalt pavement requirement is closed, then obtains pendulum value BPN and meets the actual work of pavement material more than 70, construction depth
The high frictional resistance asphalt of range request；Otherwise, mineral aggregate is prepared using the pitch of greater degree, until the road of asphalt is used
Performance meets standard specification for construction and acceptance of highway asphalt pavement requirement.
2. a kind of mixing proportion design method of high frictional resistance asphalt according to claim 1, it is characterised in that step
The construction depth of high frictional resistance asphalt to be designed is not less than 1.0mm in one.
3. a kind of mixing proportion design method of high frictional resistance asphalt according to claim 1, it is characterised in that step
The equipment that indoor long-term skid resistance is carried out to asphalt in five to test is abrasion instrument, and specific process of the test is：To pitch
Compound carry out 150,000 times loading, every time apply 0.7MPa standard axle loads, then determine loading after asphalt pendulum value and
Construction depth.
4. a kind of mixing proportion design method of high frictional resistance asphalt according to claim 1, it is characterised in that step
Pavement performance test described in six includes high-temperature rutting test, low-temperature bending test and immersion Marshall test.
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