CN111910482A - Design method for anti-blocking mix proportion of upper layer and lower layer of double-layer porous asphalt pavement - Google Patents

Design method for anti-blocking mix proportion of upper layer and lower layer of double-layer porous asphalt pavement Download PDF

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CN111910482A
CN111910482A CN202010853658.2A CN202010853658A CN111910482A CN 111910482 A CN111910482 A CN 111910482A CN 202010853658 A CN202010853658 A CN 202010853658A CN 111910482 A CN111910482 A CN 111910482A
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许涛
孔成维
许杰
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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Abstract

The invention discloses a method for designing an anti-blocking type mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement, belongs to the technical field of double-layer porous asphalt pavements, and solves the problems that the anti-blocking performance cannot be considered in the design process of the mix proportion of a drainage asphalt mixture, and the correlation between the change of an oilstone ratio and the anti-rutting performance of the double-layer porous asphalt pavement is lacked. The technical scheme adopted by the invention is as follows: and determining the optimal 4.75mm and 2.36mm sieve mesh passing rate through an orthogonal test and an indoor blockage test, entering a grading design equation, and verifying the grading design by using a grading verification equation. The optimum oilstone ratio of the double-layer porous asphalt pavement is determined by adopting a leakage test, a scattering test and a rutting test, the performance of the mixture is verified by a pavement performance test, and the mixing ratio is adjusted. The improved design method can quickly obtain the target porosity, fully considers the anti-blocking performance and the anti-rutting performance of the pavement, improves the anti-blocking performance of the double-layer porous asphalt pavement and prolongs the service life of the double-layer porous asphalt pavement.

Description

Design method for anti-blocking mix proportion of upper layer and lower layer of double-layer porous asphalt pavement
Technical Field
The invention discloses a design method of an anti-blocking type mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement, and belongs to the technical field of double-layer porous asphalt pavements.
Background
The drainage asphalt mixture is used as an open-graded mixture, and the mixing proportion determines whether the mixture has a stable skeleton structure or not, so that the drainage asphalt mixture plays an important role in the strength and the drainage performance of the mixture. The grading design is generally based on the framework stability, so that on one hand, the coarse aggregate can form a stable framework embedding and extruding structure, and on the other hand, the interference of the fine aggregate on the framework is prevented. Along with the continuous development of asphalt and modified asphalt materials, the bonding effect that asphalt cement can provide is bigger and bigger, and the mixture can have a larger void ratio while ensuring the strength of the drainage mixture.
The American national asphalt science and technology center improves an OGFC mix proportion design method, firstly, a plurality of groups of different gradations are selected in a gradation range, and after a test piece is formed by rotary compaction, whether the VCA is met or not is detectedmix≤VCADRCAnd determining the optimal asphalt dosage by a test method, and providing corresponding requirements for the void ratio, the aged/unaged abrasion loss, the water permeability and the like of the mixture.
According to the design method of the mix proportion of the Japanese drainage pavement technical guideline, firstly, the target void ratio is determined, the mix proportion of mineral aggregate is determined by a test algorithm, 3 groups of grading schemes are given by taking the passing rate of a sieve pore of 2.36mm as a standard, the asphalt using amount is estimated, a molded test piece is compacted for 50 times by Marshall double-side compaction, the grading void ratio is verified, then, the optimal asphalt using amount is determined by leakage and scattering tests, and finally, the performance of the test piece is evaluated by rutting tests, drainage tests, water stability tests and the like.
The Danish drainage pavement mix proportion design method is mainly based on the void ratio index, and pays more attention to the drainage performance, and the void ratio is required to be about 26%. The maximum asphalt loading was determined by a leak test and the high temperature performance was evaluated by the hamburger rut test, but less the pavement durability was evaluated by the fly-away test. For the determination of the asphalt dosage range in the drainage mixture, the maximum asphalt dosage needs to ensure the minimum void ratio of the pavement, and the minimum asphalt dosage considers that the mixture has enough particle binding power and has better water damage resistance.
The domestic mix design method is similar to that of Japan, and the target void ratio is mainly obtained by controlling the 2.36mm and 4.75mm mesh passage rates. After the optimal asphalt dosage is estimated, 5 groups of asphalt dosages are given at intervals of 0.5%, and the selected grading is tested for high temperature, low temperature, water stability and drainage performance through a flying off test, a leakage test and a Marshall stability test to verify whether the selected grading meets the specification requirements.
At present, the design method of the drainage asphalt mixture at home and abroad mainly obtains the target porosity by controlling the passing rate of the key sieve pores, and then determines the optimal oilstone ratio by adopting a Schrenberg leakage test and a Kentunberg scattering test. And verifying whether the grading and the oilstone ratio meet the standard requirements or not through a road performance test. The method emphasizes the consideration of gradation and void ratio on the premise that the mix proportion design meets the specification. The phenomenon of gravel blockage is easy to occur in the use process of the double-layer porous asphalt pavement, and obviously, the grading design is related to the anti-blocking performance of the drainage asphalt pavement. The drainage performance is emphasized in the design process of the mix proportion of the drainage asphalt mixture at home and abroad at present, and the important index of the anti-blocking capability of the double-layer porous asphalt pavement is neglected. Meanwhile, due to the characteristic of large porosity, rutting damage is easy to occur in the use process of the double-layer porous asphalt pavement, and the research on optimizing the asphalt-stone ratio to improve the rutting resistance of the double-layer porous asphalt pavement is lacked in the current mix proportion design process.
The method firstly designs the 4.75mm and 2.36mm sieve mesh passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement through an orthogonal test to obtain an orthogonal test table. And determining the 4.75mm and 2.36mm sieve mesh passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement with the best anti-blocking performance according to the mass of the remaining blocking substances on the surface of the double-layer porous asphalt pavement test piece by adopting an indoor blocking test. And respectively substituting the optimal aperture passage rates of 4.75mm and 2.36mm on the upper layer and the lower layer of the double-layer porous asphalt pavement into the calculation equation of the SAC grading design method of the coarse aggregate and the fine aggregate to calculate the aperture passage rates of other apertures on the upper layer and the lower layer of the double-layer porous asphalt pavement. By VCAdrfAnd adjusting the grading of the upper layer and the lower layer of the double-layer porous asphalt pavement by using a grading verification equation. And determining the optimal oilstone ratio of the upper layer and the lower layer of the double-layer porous asphalt pavement by adopting a Schrenberg leakage test, a Kentunberg scattering test and a rutting test. On the basis of ensuring that the road performance of the drainage asphalt mixture meets the specification, the anti-blocking performance and the anti-rutting performance of the road surface are fully considered, the anti-blocking performance and the durability of the double-layer porous asphalt road surface are improved, and the service life of the double-layer porous asphalt road surface is prolonged.
Disclosure of Invention
(1) Technical problem
The invention aims to provide a design method of an anti-clogging type mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement. According to the invention, the anti-blocking performance and the anti-rutting performance of the drainage asphalt mixture are fully considered on the basis of paying attention to grading and porosity, and the problems that the anti-blocking performance cannot be considered in the design process of the mix proportion of the drainage asphalt mixture and the anti-rutting performance of a double-layer porous asphalt pavement is improved due to the lack of an optimized oilstone ratio are solved.
(2) Technical scheme
The invention provides a design method of an anti-blocking type mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement, aiming at solving the problem that the anti-blocking performance cannot be considered in the design process of the mix proportion of a drainage asphalt mixture and the problem that the anti-rutting performance of the double-layer porous asphalt pavement is improved due to the lack of an optimized oilstone ratio. The technical scheme is as follows: firstly, designing the 4.75mm and 2.36mm sieve mesh passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement through an orthogonal test to obtain an orthogonal test table and manufacturing a double-layer porous asphalt pavement test piece; mixing the blockages with the particle sizes of 0.1mm, 0.5mm and 1mm according to equal proportion, and determining the optimal 4.75mm and 2.36mm sieve mesh passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement according to the mass of the blockages left on the surface of the double-layer porous asphalt pavement through a blockage test; respectively substituting the 4.75mm and 2.36mm sieve pore passage rates of the upper and lower layers of the double-layer porous asphalt pavement into the SAC grading design equation of the sieve pore passage rates of coarse and fine aggregates, calculating the rest sieve pore passage rates of the upper and lower layers of the double-layer porous asphalt pavement to obtain grading, and performing VCA (vertical gradient analysis) on the obtained gradingdrfAdjusting the grading of the upper layer and the lower layer of the double-layer porous asphalt pavement by using a grading verification equation; and optimizing the oilstone ratio through a Schrenberg leakage test, a Kentunberg scattering test and a rutting test, and determining the optimal oilstone ratio of the upper layer and the lower layer of the double-layer porous asphalt pavement. And verifying whether the mix proportion design meets the standard requirements or not by adopting a pavement performance test, and if not, carrying out proper adjustment.
(3) Advantageous effects
The grading and the void ratio are mainly considered in the design process of the mix proportion of the drainage asphalt mixture at home and abroad, and the anti-blocking performance and the anti-rutting performance are neglected. At present, no mix proportion design method is available for bringing the anti-blocking performance and the anti-rutting performance of the drainage asphalt mixture into the mix proportion design consideration range. Therefore, the optimal 4.75mm and 2.36mm screen hole passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement are determined through an orthogonal test and an indoor blocking test, and the optimal 4.75mm and 2.36mm screen hole passing rates of the upper layer and the lower layer of the double-layer porous asphalt pavement are respectively substituted into a SAC grading design equation. The improved design method can quickly obtain the target porosity, and takes the anti-blocking performance and the anti-rutting performance of the pavement into consideration on the basis of fully considering the pavement performance of the drainage asphalt mixture, so that the anti-blocking performance and the durability of the double-layer porous asphalt pavement are improved, and the service life of the double-layer porous asphalt pavement is prolonged.
Detailed Description
The invention provides a design method of an anti-blocking mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement, which comprises the following specific implementation steps:
(1) respectively designing 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement by adopting an orthogonal test method to obtain an orthogonal test table, solving other sieve mesh passing rates by adopting an interpolation method, preliminarily drawing up the gradation of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement, manufacturing a double-layer porous asphalt pavement test piece with the length of 300mm, the width of 200mm and the thickness of 100mm by adopting the estimated oilstone ratio, wherein the thickness of the upper layer is 40mm, and the thickness of the lower layer is 60 mm;
(2) mixing the blockages with the particle sizes of 0.1mm, 0.5mm and 1mm in equal proportion for an indoor blockage test, spreading the mixed blockages with equal mass on the surface of a test piece, simulating the carrying effect of the surface runoff of the double-layer porous asphalt pavement on the blockages when a certain rainfall intensity is simulated, collecting the blockages left on the surface of the test piece after 30min, drying, and weighing the blockages with the mass m1；
(3) According to the mass m of the left blockage on the surface of the double-layer porous asphalt mixture test piece1Determining the 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement when the anti-blocking performance of the double-layer porous asphalt pavement is optimal;
(4) dividing the 4.75mm and 2.36mm sieve pore passing rate of the double-layer porous asphalt pavement upper and lower layer asphalt mixture determined in the step (3)Substitution into
Figure BSA0000216772860000031
Wherein DmaxIs the nominal or actual maximum particle size, diAt a certain mesh size, PdiIs the size d of the sieve holeiThe A and the B are unknowns to be solved, and the passing rates of the rest coarse and fine aggregate sieve pores of the asphalt mixture on the upper layer and the lower layer of the double-layer porous asphalt pavement are respectively calculated;
(5) substituting the coarse and fine aggregate sieve pore passing rates of the double-layer porous asphalt mixture on the upper and lower layers of the asphalt pavement obtained in the step (4) into
Figure BSA0000216772860000032
Wherein P isacIs coarse aggregate content, PfaIs a fine aggregate content, PfiAs filler content, GCADRC，LFor coarse aggregate apparent density and dry density GCADRCMean value, VCADRC，LLoose-pack porosity VCA for coarse aggregateDRLAnd dry tamped porosity VCADRCAverage value, VaIs GCADRLTarget porosity, P, of asphalt mixtureBIn the oil-stone ratio, Gb，faIs the fine aggregate bulk density, Ga，fiAs filler apparent density, GBVerifying whether the contents of coarse and fine aggregates of the upper and lower layers of the double-layer porous asphalt pavement meet requirements or not for the asphalt density, and determining the grading of the upper and lower layers of the double-layer porous asphalt pavement;
(6) respectively determining the optimal oilstone ratio ranges of the upper layer and the lower layer of the double-layer porous asphalt pavement by adopting a Schrenberg leakage test and a Kentusberg scattering test, dividing the optimal oilstone ratio ranges of the upper layer and the lower layer of the double-layer porous asphalt pavement at intervals of 0.1%, respectively manufacturing rutting plate test pieces of the upper layer and the lower layer of the double-layer porous asphalt pavement by adopting the divided oilstone ratio and the grading of the upper layer and the lower layer of the double-layer porous asphalt pavement determined in the step (5), carrying out a rutting test, and respectively determining the optimal oilstone ratio of the upper layer and the optimal oilstone ratio of the lower layer of the double-layer porous asphalt pavement according to the dynamic stability;
(7) respectively mixing the mixture by adopting the determined upper and lower layer grading and the oilstone ratio of the double-layer porous asphalt pavement, forming a test piece, and verifying the grading of the upper and lower layers of the double-layer porous asphalt pavement determined in the step (5) and the optimal oilstone ratio of the upper and lower layers of the double-layer porous asphalt pavement determined in the step (6) through road performance and anti-blocking performance tests;
(8) and (3) adjusting the 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement according to the pavement performance and anti-blocking performance test results, repeating the steps (4) to (7), and determining the design of the anti-blocking type mix proportion of the upper and lower layers of the double-layer porous asphalt pavement when the pavement performance and anti-blocking performance test results of the upper and lower layers of the double-layer porous asphalt pavement meet the design requirements.

Claims (1)

1. The invention provides a method for designing the anti-blocking mix proportion of an upper layer and a lower layer of a double-layer porous asphalt pavement, which is characterized by comprising the following steps:
(1) respectively designing 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement by adopting an orthogonal test method to obtain an orthogonal test table, solving other sieve mesh passing rates by adopting an interpolation method, preliminarily drawing up the gradation of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement, manufacturing a double-layer porous asphalt pavement test piece with the length of 300mm, the width of 200mm and the thickness of 100mm by adopting the estimated oilstone ratio, wherein the thickness of the upper layer is 40mm, and the thickness of the lower layer is 60 mm;
(2) mixing the blockages with the particle sizes of 0.1mm, 0.5mm and 1mm in equal proportion for an indoor blockage test, spreading the mixed blockages with equal mass on the surface of a test piece, simulating the carrying effect of the surface runoff of the double-layer porous asphalt pavement on the blockages when a certain rainfall intensity is simulated, collecting the blockages left on the surface of the test piece after 30min, drying and weighing the blockages with the mass m 1;
(3) according to the mass m of the left blockage on the surface of the double-layer porous asphalt mixture test piece1Determining the 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement when the anti-blocking performance of the double-layer porous asphalt pavement is optimal;
(4) replacing the 4.75mm and 2.36mm sieve hole passing rates of the double-layer porous asphalt pavement upper and lower layer asphalt mixture determined in the step (3) respectivelyInto
Figure FSA0000216772850000011
Wherein DmaxIs the nominal or actual maximum particle size, diAt a certain mesh size, PdiIs the size d of the sieve holeiThe A and the B are unknowns to be solved, and the passing rates of the rest coarse and fine aggregate sieve pores of the asphalt mixture on the upper layer and the lower layer of the double-layer porous asphalt pavement are respectively calculated;
(5) substituting the coarse and fine aggregate sieve pore passing rates of the double-layer porous asphalt mixture on the upper and lower layers of the asphalt pavement obtained in the step (4) into
Figure FSA0000216772850000012
Wherein P isacIs coarse aggregate content, PfaIs a fine aggregate content, PfiAs filler content, GCADRC，LFor coarse aggregate apparent density and dry density GCADRCMean value, VCADRC，LLoose-pack porosity VCA for coarse aggregateDRLAnd dry tamped porosity VCADRCAverage value, VaIs GCADRLTarget porosity, P, of asphalt mixtureBIn the oil-stone ratio, Gb，faIs the fine aggregate bulk density, Ga，fiAs filler apparent density, GBVerifying whether the contents of coarse and fine aggregates of the upper and lower layers of the double-layer porous asphalt pavement meet requirements or not for the asphalt density, and determining the grading of the upper and lower layers of the double-layer porous asphalt pavement;
(6) respectively determining the optimal oilstone ratio ranges of the upper layer and the lower layer of the double-layer porous asphalt pavement by adopting a Schrenberg leakage test and a Kentusberg scattering test, dividing the optimal oilstone ratio ranges of the upper layer and the lower layer of the double-layer porous asphalt pavement at intervals of 0.1%, respectively manufacturing rutting plate test pieces of the upper layer and the lower layer of the double-layer porous asphalt pavement by adopting the divided oilstone ratio and the grading of the upper layer and the lower layer of the double-layer porous asphalt pavement determined in the step (5), carrying out a rutting test, and respectively determining the optimal oilstone ratio of the upper layer and the optimal oilstone ratio of the lower layer of the double-layer porous asphalt pavement according to the dynamic stability;
(7) respectively mixing the mixture by adopting the determined upper and lower layer grading and the oilstone ratio of the double-layer porous asphalt pavement, forming a test piece, and verifying the grading of the upper and lower layers of the double-layer porous asphalt pavement determined in the step (5) and the optimal oilstone ratio of the upper and lower layers of the double-layer porous asphalt pavement determined in the step (6) through road performance and anti-blocking performance tests;
(8) and (3) adjusting the 4.75mm and 2.36mm sieve mesh passing rates of the upper and lower layers of the asphalt mixture of the double-layer porous asphalt pavement according to the pavement performance and anti-blocking performance test results, repeating the steps (4) to (7), and determining the design of the anti-blocking type mix proportion of the upper and lower layers of the double-layer porous asphalt pavement when the pavement performance and anti-blocking performance test results of the upper and lower layers of the double-layer porous asphalt pavement meet the design requirements.
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JP2005256450A (en) * 2004-03-12 2005-09-22 Fuji Kosan Kk Environment-friendly binder base material for light-colored pavement, and binder for light-colored pavement using it
CN103485255A (en) * 2013-09-17 2014-01-01 长安大学 Optimization design method of mix proportion of micro-surfacing mixture
CN105236830A (en) * 2015-09-29 2016-01-13 长安大学 Drainage asphalt mixture mix-ratio designing method based on volumetric parameters
CN204982583U (en) * 2015-04-29 2016-01-20 山西省交通科学研究院 Permanent seal cooling road surface structure suitable for severe cold district
CN110004788A (en) * 2019-03-28 2019-07-12 河海大学 A kind of drainage asphalt paving structure slowing down pore plugging
CN110804922A (en) * 2019-10-12 2020-02-18 江苏增光复合材料科技有限公司 Airport pavement bonding layer and construction method thereof and airport pavement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005256450A (en) * 2004-03-12 2005-09-22 Fuji Kosan Kk Environment-friendly binder base material for light-colored pavement, and binder for light-colored pavement using it
CN103485255A (en) * 2013-09-17 2014-01-01 长安大学 Optimization design method of mix proportion of micro-surfacing mixture
CN204982583U (en) * 2015-04-29 2016-01-20 山西省交通科学研究院 Permanent seal cooling road surface structure suitable for severe cold district
CN105236830A (en) * 2015-09-29 2016-01-13 长安大学 Drainage asphalt mixture mix-ratio designing method based on volumetric parameters
CN110004788A (en) * 2019-03-28 2019-07-12 河海大学 A kind of drainage asphalt paving structure slowing down pore plugging
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