CN111916158A - Mix proportion design method for remixed in-situ heat regeneration asphalt mixture - Google Patents
Mix proportion design method for remixed in-situ heat regeneration asphalt mixture Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 467
- 239000000203 mixture Substances 0.000 title claims abstract description 182
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000013461 design Methods 0.000 title claims abstract description 45
- 230000008929 regeneration Effects 0.000 title claims description 16
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- 238000011065 in-situ storage Methods 0.000 title claims description 12
- 238000002156 mixing Methods 0.000 claims abstract description 89
- 239000000463 material Substances 0.000 claims abstract description 65
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- 239000012492 regenerant Substances 0.000 claims abstract description 43
- 238000005070 sampling Methods 0.000 claims abstract description 16
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- 230000032683 aging Effects 0.000 claims description 20
- 238000002474 experimental method Methods 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 11
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 16
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- 238000005516 engineering process Methods 0.000 description 5
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- 238000011056 performance test Methods 0.000 description 4
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Abstract
The invention discloses a mix proportion design method of a remixed type hot in-place recycling asphalt mixture, which comprises the following steps: sampling a construction pavement to obtain an old asphalt reclaimed material; determining the mixing proportion R of the new aggregate by determining the mixing proportion of the regenerantnbBlending ratio R of recycled asphalt and old asphaltobDetermining the optimal asphalt dosage P of the regenerated asphalt mixtureb(ii) a Determining the bitumen dosage P of a New Bituminous mixturenbAnd determining the optimal new asphalt dosage K, and finally determining the mixing proportion of the regenerated asphalt mixture. The mix proportion design method of the remixed hot in-place recycled asphalt mixture is more refined, perfected and operable, and the mix proportion design of the recycled asphalt mixture is more definite, so that the specific dosage of each material in the recycled asphalt mixture is determined, and the construction efficiency and the construction operability are improvedConstruction quality, easy popularization and implementation.
Description
Technical Field
The invention belongs to the technical field of maintenance and repair of old asphalt pavements, and particularly relates to a mix proportion design method of a remixed in-situ heat regenerated asphalt mixture.
Background
The in-situ hot regenerating technology adopts special in-situ hot regenerating equipment to heat and mill the asphalt pavement, mixes a certain amount of new asphalt, new asphalt mixture, regenerant and the like in situ, and realizes the regeneration of the old asphalt concrete pavement within a certain depth range on the surface at one time through the working procedures of hot mixing, paving, rolling and the like. The re-mixing type hot in-place recycling technology is that the old asphalt pavement is heated and milled, a certain amount of recycling agent, new asphalt and a new asphalt mixture are added in place, and the mixture is subjected to hot state mixing, spreading and compaction molding. The mix proportion design of the asphalt pavement hot in-place recycling asphalt mixture is one of the cores of hot in-place recycling construction. In construction, the construction operation can be carried out only after the mixture ratio of the old asphalt reclaimed material, the regenerant, the new asphalt and the new asphalt mixture is determined, and the old asphalt reclaimed material, the regenerant, the new asphalt and the new asphalt mixture form the regenerated asphalt mixture.
In the prior art, most of asphalt mixture mix proportion design methods in the remixed type hot in-place recycling technology are general and not refined, more and undefined in actual operation, and more experience is often caused when the use amount of various materials in the recycled asphalt mixture is determined, so that the method is inconvenient to implement and popularize, and influences the performance of the recycled asphalt mixture and the quality of an asphalt pavement to a certain extent.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a mix proportion design method of a remixed hot in-place recycling asphalt mixture. The technical problem to be solved by the invention is realized by the following technical scheme:
a mix proportion design method of a remixed hot in-place recycling asphalt mixture comprises the following steps:
In one embodiment of the present invention, step 10 comprises:
step 101, dividing a construction road surface into a plurality of sub road sections based on a road surface structure of the construction road surface and historical maintenance records;
and 102, determining the position of a sampling point for each sub-section based on a random sampling method, and sampling at the position to obtain an old asphalt reclaimed material.
In one embodiment of the present invention, step 20 comprises:
step 201, dividing an old asphalt reclaimed material into a combustion sample, an extraction sample and a test sample;
step 202, processing a combustion sample by adopting a combustion experiment method or an extraction experiment method to obtain old aggregates, and determining the content of old asphalt;
step 203, determining the grading range of the old aggregate based on the old aggregate;
step 204, processing the extracted sample by adopting an extraction experimental method to obtain old asphalt;
step 205, determining an aging performance index based on the old asphalt.
In one embodiment of the present invention, step 30 comprises:
step 301, determining an old asphalt label based on the aging performance index;
step 302, determining a target label of a regenerated asphalt sample based on an initial asphalt label of a construction pavement;
step 303, doping a plurality of regenerants with different preset proportions into the old asphalt by a trial-and-error method based on the old asphalt label and the target label to obtain a plurality of regenerated asphalt samples;
and 304, detecting the performance indexes of the plurality of regenerated asphalt samples, and determining the preset proportion of the regenerant corresponding to the regenerated asphalt sample meeting the performance index of the target label as the blending proportion of the regenerant.
In one embodiment of the present invention, step 50 comprises:
step 501, determining estimated optimal asphalt consumption of at least five recycled asphalt mixtures based on pavement information of a construction pavement;
step 502, performing a Marshall test based on at least five oilstone ratios respectively corresponding to the estimated optimal asphalt dosage and test samples to obtain a first test result;
step 503, determining the optimum asphalt dosage P based on the Marshall test standard value of the target grading type and the first test resultb。
In one embodiment of the present invention, step 60 comprises:
step 601, based on the optimal asphalt dosage PbOld asphalt content PobMixing proportion R of old asphalt reclaimed materialobThe new aggregate mixing proportion RnbDetermining calculated value P 'of asphalt dosage'nb(ii) a Wherein,
step 602, determining an asphalt consumption prediction value P' of the new asphalt mixture based on the road information and the target grading typenb；
Step 603, calculating the asphalt dosage value P'nbAnd an estimated asphalt quantity P ″)nbIs determined as the amount of bitumen Pnb。
In one embodiment of the present invention, step 70 comprises:
step 701, based on the optimal asphalt dosage PbOld asphalt content PobMixing proportion R of old asphalt reclaimed materialobThe new aggregate mixing proportion RnbAnd the amount of asphalt PnbDetermining the calculated value K' of the optimal new asphalt usage; wherein,
step 702, determining at least five optimal new asphalt dosage pre-estimated values based on the optimal new asphalt dosage calculation value K';
step 703, performing a marshall test based on the respective oilstone ratios and test samples corresponding to the at least five optimal new asphalt usage estimates to obtain a second test result;
and step 704, determining the optimal new asphalt dosage K based on the Marshall test standard value of the target grading type and the second test result.
The invention has the beneficial effects that:
the method comprises the steps of collecting representative Reclaimed old Asphalt (RAP) for extraction and screening to obtain the content of the old Asphalt in the Reclaimed old Asphalt and the composition of old aggregate particles, and using the obtained content as a target mix proportion design basis. According to the aging degree of old asphalt and the performance requirement of asphalt, a proper regenerant is selected, and the blending ratio of the regenerant is determined through tests. And comprehensively considering the regeneration thickness, the old aggregate grading range, the old asphalt-stone ratio, the target grading range, the utilization ratio of RAP and the like to determine the grading and blending ratio of the blended new aggregate. The new aggregate gradation should meet the engineering design specification range of the target gradation type to ensure the homogeneity of the new asphalt mixture. And (4) drawing up the proportion of each grade of new aggregate according to the target grading type. And respectively taking the synthetic grading of the new aggregate and the old aggregate in the RAP as one mineral aggregate in the remixed regenerated asphalt mixture to carry out mineral aggregate grading design, and determining the blending proportion of the new aggregate.
The mix proportion design method of the remixed hot in-place recycled asphalt mixture is more refined and perfect, and the mix proportion of the recycled asphalt mixture is more definite, so that the specific dosage of each material in the recycled asphalt mixture can be determined, the construction efficiency and the construction quality are improved, and the method is easy to popularize and implement. The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of a mix design method for a remixed hot in-place recycled asphalt mixture according to an embodiment of the present invention;
FIG. 2 is a grading curve diagram of old asphalt pavement material (RAP) of old reclaimed asphalt provided by the embodiment of the invention;
FIG. 3 is a new asphalt mixture (AC-16) grading curve diagram provided by an embodiment of the present invention;
FIG. 4 is a 20% new asphalt mix synthesized hot recycled asphalt mix gradation graph provided by an embodiment of the present invention;
FIG. 5-1 is a Marshall test result stability curve of the hot recycled asphalt mixture provided by the embodiment of the present invention;
FIG. 5-2 is a graph of the Marshall test results of void fraction of hot recycled asphalt provided in the examples of the present invention;
5-3 are graphs of the maximum theoretical relative density of the hot recycled asphalt mixture Marshall test results provided by examples of the present invention;
FIGS. 5-4 are Marshall test saturation curves for hot recycled asphalt mixtures provided in examples of the present invention;
FIGS. 5-5 are flow value graphs of Marshall test results for hot recycled asphalt mixtures provided in examples of the present invention;
FIGS. 5-6 are graphs of the results of Marshall tests on hot recycled asphalt mixtures according to examples of the present invention;
FIG. 6-1 is a Marshall test result stability plot of another hot recycled asphalt mixture provided in an example of the present invention;
FIG. 6-2 is a graph of the void fraction of another hot recycled asphalt mixture Marshall test result provided by an example of the present invention;
FIGS. 6-3 are graphs of the maximum theoretical relative density of another hot recycled asphalt mixture Marshall test results provided by examples of the present invention;
FIGS. 6-4 are graphs of the saturation curves of another hot recycled asphalt mixture Marshall test provided in an example of the present invention;
FIGS. 6-5 are graphs of Marshall test result flow values for another hot recycled asphalt mixture provided in an example of the present invention;
fig. 6-6 are graphs of the mineral aggregate void fraction of another hot recycled asphalt mixture marshall test result provided in examples of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
Example one
Referring to fig. 1, a mix proportion design method for a remixed hot in-place recycling asphalt mixture includes:
and step 10, sampling the construction pavement to obtain the old asphalt reclaimed material.
Specifically, step 10 specifically includes: step 101 and step 102.
Step 101, dividing the construction road surface into a plurality of sub road sections based on the road surface structure and the historical maintenance records of the construction road surface.
In which, when a sub-road section is drawn, it is possible to analyze road surface conditions, such as the degree of damage of the road surface, etc., based on the road surface structure and the historical repair record, and then to regard the road section having the same or close road surface conditions as one sub-road section. The construction pavement is the pavement needing in-situ heat regeneration construction.
And 102, determining the position of a sampling point for each sub-section based on a random sampling method, and sampling at the position to obtain an old asphalt reclaimed material.
When the position of the sampling point is determined, 1 position of each lane of each sub-road section is respectively sampled according to a random sampling method in road foundation and Pavement site test regulations (JTG 3450), a mechanical cutting method is adopted to cut the mixture within the regeneration depth range, and the cut mixture is also used Asphalt Reclaimed material (RAP). The regeneration depth refers to the loosening depth set by the regeneration equipment, namely the difference between the elevation of the old pavement and the elevation of the bottom surface of the regeneration layer.
Specifically, step 20 includes: step 201-step 205.
Step 201, the old asphalt reclaimed material is divided into a combustion sample, an extraction sample and a test sample.
Step 202, a combustion experiment method or an extraction experiment method is adopted to process a combustion sample to obtain old aggregates, and the content of old asphalt is determined, namely the old asphalt-asphalt ratio can be obtained.
Step 203, determining the grading range of the old aggregates based on the old aggregates. Wherein the old aggregate grading range of the old asphalt reclaimed material can be determined by screening the old aggregates.
And step 204, processing the extracted sample by adopting an extraction experimental method to obtain the old asphalt.
Step 205, determining an aging performance index based on the old asphalt. Wherein, the aging performance indexes comprise three indexes of penetration degree, softening point and ductility. The old asphalt can be divided into a plurality of samples, wherein a part of the samples can be used for performance test experiments to determine the aging performance index, and a part of the samples can be used for subsequent regenerant experiments.
And step 30, determining the mixing proportion of the regenerant based on the initial asphalt label, the regenerant, the aging performance index and the old asphalt of the constructed pavement.
Specifically, step 30 includes: step 301-step 304.
Step 301, determining an old asphalt label based on the aging performance index. For example, the penetration degree of the old asphalt can be determined to meet the penetration degree standard of 50 # asphalt according to the penetration degree, so that the old asphalt is determined to be numbered 50.
Step 302, determining a target label of the recycled asphalt sample based on the initial asphalt label of the construction pavement. The asphalt used in the initial design of the construction pavement is given the initial asphalt designation, for example, 90 asphalt, and the target designation is a designation lower than the initial asphalt designation, for example, the target designation may be a-70 asphalt.
And 303, doping a plurality of regenerants with different preset proportions into the old asphalt by adopting a trial-and-error method based on the old asphalt label and the target label to obtain a plurality of regenerated asphalt samples. A sample of a regenerant experiment of old asphalt is divided into a plurality of sub-samples, and after the regenerant is added into the old asphalt, the performance can be recovered to a certain degree. In one possible implementation, three samples of reclaimed asphalt are obtained by blending a predetermined ratio (as a percentage of the old asphalt) of the rejuvenating agent into three subsamples of the sample of the rejuvenating agent experiment of old asphalt, for example, 5%, 7% and 9% of the rejuvenating agent in an arithmetic series of proportions.
And 304, detecting the performance indexes of the plurality of regenerated asphalt samples, and determining the preset proportion of the regenerant corresponding to the regenerated asphalt sample meeting the performance index of the target label as the blending proportion of the regenerant. In the step, a plurality of regenerated asphalt samples are subjected to performance index detection of penetration, softening point and ductility, curves of three indexes are drawn, and the preset proportion of the regenerant of the regenerated asphalt sample conforming to the target label is determined as the blending proportion of the regenerant by utilizing an interpolation method. For example, if the performance index of the recycled asphalt obtained by blending 9% of the recycling agent into the old asphalt meets the performance index of the asphalt A-70, 9% is determined as the blending ratio of the recycling agent.
Specifically, step 40 includes: step 401-step 405.
Step 401, determining a target grading type according to the initial grading type of the construction road surface, where the target grading type is a grading type of a recycled asphalt mixture to be used during in-situ hot construction, and the target grading type is the same as or one-model-thicker than the initial grading type of the construction road surface. The initial grading type is AC-13 type, and the target grading type can be AC-13 type or AC-16 type.
When the target grading type and the grading range corresponding to the target grading type are determined, information such as traffic load grade, engineering properties, traffic type information, material type and the like can be integrated, and information such as historical use information records of the same similar engineering and the like can be used for grading the target grading type and the target grading range.
Step 402, the blending ratio of the added new aggregate gradation and the relative old asphalt reclaimed material is determined according to the regeneration thickness and the old aggregate gradation range, the target gradation type, the old asphalt content and the like. The new aggregate gradation should meet the gradation range of the target gradation type to ensure the homogeneity of the new asphalt mixture.
And 403, determining the proportion of each grade of new aggregate according to the new aggregate gradation and the target gradation type.
Step 404, aggregate grading design is carried out by respectively using the synthetic grading of the old aggregate and the new aggregate in the RAP as one aggregate in the regenerated asphalt mixture, and the blending ratio R of the new aggregate is determinednbBlending ratio R of recycled asphalt and old asphaltob。
Step 405, when the composite gradation of the old aggregate and the new aggregate in the RAP can not meet the gradation range corresponding to the target gradation type, readjusting the proportion of each grade of the new aggregate, and repeating steps 403 and 404.
Specifically, step 50 includes: step 501-step 503.
Step 501, determining estimated optimal asphalt consumption of at least five recycled asphalt mixtures based on the pavement information of the construction pavement.
In this step, the predicted asphalt quantity value P 'can be estimated according to the road grade, the climate information, the road traffic type information and the historical engineering construction information record'bThen P'b、P′b±0.3、P′bThese five asphalt amounts of + -0.6 are used as the five estimated optimum asphalt amounts. Of course, more than five predicted optimal asphalt amounts may be predicted.
And 502, performing Marshall test based on five oilstone ratios respectively corresponding to the five estimated optimal asphalt dosages and the test sample to obtain a first test result. The test sample can be divided into two parts, namely a first test sample and a second test sample, wherein the first test sample is divided into five sub-samples, and the second test sample is divided into five sub-samples. The Marshall test was carried out according to the test protocol for road engineering asphalt and asphalt mixtures (JTG E20).
Wherein, the preparation process of the Marshall test piece is as follows:
5.1, placing the first test sample in an oven, heating to 140 ℃, wherein the time for heating the test piece is not more than 2h, and preventing the first test sample from further aging;
5.2, respectively placing the new aggregate and the new asphalt in an oven for heating: heating the new aggregate to 190 ℃, wherein the heating temperature is preferably 150-160 ℃ when the new asphalt is the matrix asphalt, and the heating temperature is preferably 160-170 ℃ when the new asphalt is the modified asphalt;
5.3, sequentially adding a sub-sample of the heated first test sample, a regenerant, new aggregate and new asphalt into a preheated mixing pot, and uniformly mixing to obtain a test piece; wherein the amount of the added regenerant is the blending ratio of the regenerant determined in step 30, the amount of the new aggregate is the blending ratio of the new aggregate determined in step 40, and the amount of the new asphalt is the ratio of the new asphalt in the estimated optimal asphalt dosage.
And 5.4, pouring the mixture required by one test piece into a preheating test mold, wherein the forming method is the same as that of the hot-mixed asphalt mixture.
And 5.5, detecting the formed test piece, and drawing a relational graph by taking the oilstone ratio as a horizontal coordinate and respectively taking the mineral aggregate clearance rate, the maximum theoretical relative density, the void fraction, the gross volume density, the stability, the flow value and the saturation as a vertical coordinate.
5.6 five Marshall tests according to steps 5.1-5.5, the test results of the five Marshall tests are obtained as the first test results.
Step 503, determining the optimum asphalt dosage P based on the Marshall test standard value of the target grading type and the first test resultb。
Wherein the density has no peak value, and the oilstone ratio corresponding to the standard value of the void ratio is a, so that the initial value OAC of the optimal oilstone ratio1＝a；
The indexes meet the OAC of the Marshall test standard value of the target grading typemin～OACmax；
OAC2＝(OACmin+OACmax)/2；
Thus, the optimum asphaltene ratio is (OAC)1+OAC2) 2, so that the optimum asphalt dosage P can be obtained by conversionb。
Specifically, step 60 includes: step 601-step 603.
Step 601, based on the optimal asphalt dosage PbOld asphalt content PobMixing proportion R of old asphalt reclaimed materialobThe new aggregate mixing proportion RnbDetermining calculated value P 'of asphalt dosage'nb(ii) a Wherein,
wherein, P'nbShould be more than the minimum asphalt dosage Pmb(engineering)Optimum oilstone ratio-0.6 for the local design grading type). Minimum asphalt dosage PmbReference is made to table 1.
| Grading type | Pmb(％) |
| AC-25 | 3.5 |
| AC-20 | 3.7 |
| AC-16 | 4.0 |
| AC-13 | 4.2 |
| AC-10 | 4.5 |
TABLE 1
Step 602, determining an asphalt consumption prediction value P' of the new asphalt mixture based on the road information and the target grading typenb；
In this step, the predicted asphalt quantity value P' of the new asphalt mixture can be determined according to the target grading type, the road grade, the climate information, the road traffic type information and the historical engineering construction information recordnb。
Step 603, calculating the asphalt dosage value P'nbAnd an estimated asphalt quantity P ″)nbIs determined as the amount of bitumen Pnb. That is to say Pnb＝min{P′nb，P″nb}。
Specifically, step 70 includes: step 701-step 704.
Step 701, based on the optimal asphalt dosage PbOld asphalt content PobMixing proportion R of old asphalt reclaimed materialobThe new aggregate mixing proportion RnbAnd the amount of asphalt PnbDetermining the calculated value K' (accounting for the weight percentage of RAP) of the optimal new asphalt usage; wherein,
at step 702, at least five optimal predicted new asphalt amounts are determined based on the calculated optimal new asphalt amount K'. The five optimal new asphalt dosage estimated values are respectively K ', K ' +/-0.2 and K ' +/-0.4, and the Marshall test pieces are respectively formed by the five oilstone ratios respectively corresponding to the five optimal new asphalt dosage estimated values.
And 703, performing Marshall test on the five oilstone ratios and the test sample respectively corresponding to the five optimal new asphalt dosage estimated values to obtain a second test result. Wherein the Marshall test is carried out according to the Marshall test method in technical Specification for construction of asphalt road surfaces for road engineering (JTG F40).
Wherein, the preparation process of the Marshall test piece is as follows:
7.1, the second test specimen is placed in an oven and heated to 140 ℃.
7.2, placing the new aggregate and the new asphalt in an oven for heating: heating the new mineral aggregate to 190 ℃, wherein the heating temperature is preferably 150-160 ℃ when the new asphalt is the matrix asphalt, and the heating temperature is preferably 160-170 ℃ when the new asphalt is the modified asphalt;
7.3 prepared according to Marshall specimen of asphalt mixture in test Specification for asphalt and asphalt mixture for road engineering (JTG E20)According to the required asphalt dosage PnbAdding new asphalt to stir a new asphalt mixture, and putting the stirred new asphalt mixture into an oven at the temperature of 150-160 ℃ for heat preservation;
7.4, adding the heated second test sample, the regenerant and the new asphalt with the optimal new asphalt dosage estimated value into a preheated mixing pot, uniformly mixing, adding 7.3 of the new asphalt mixture, and uniformly mixing to obtain a test piece. Wherein, the amount of the added regenerant is the blending ratio of the regenerant determined in step 30.
7.5, pouring the mixture required by a test piece into a preheating test mold, wherein the forming method is the same as that of the hot-mixed asphalt mixture.
7.6, detecting the formed test piece, and drawing a relational graph by taking the oilstone ratio as a horizontal coordinate and respectively taking the mineral aggregate clearance rate, the maximum theoretical relative density, the void fraction, the gross volume density, the stability, the flow value and the saturation as a vertical coordinate.
7.7 five Marshall tests according to steps 7.1-5.6, the test results of the five Marshall tests are obtained as the second test results.
And step 704, determining the optimal new asphalt dosage K based on the Marshall test standard value of the target grading type and the second test result.
Wherein the initial value OAC of the optimum asphalt dosage is because the density has no peak value and the oilstone ratio corresponding to the standard value of the void ratio is a1＝a；
The indexes meet the OAC of the Marshall test standard value of the target grading typemin～OACmax；
OAC2＝(OACmin+OACmax)/2；
Thus, the optimum New asphalt to Stone ratio (OAC)1+OAC2) And/2, therefore, the oilstone ratio is converted to obtain the optimal new asphalt dosage K.
In the invention, the mix proportion design inspection is carried out according to the method of the current technical Specification for constructing the asphalt pavement of the highway (JTG F40).
The test section tests the performance of the recycled asphalt mixture, and the performance of the in-situ hot recycled asphalt mixture is tested by the test section. The main items tested are: the technical indexes of the on-site recycled asphalt, Marshall stability, the gradation of the recycled mixture, the rutting dynamic stability, the soaking Marshall residual stability, the freeze-thaw splitting strength ratio, the low-temperature damage strain and the like are tested to determine whether the indexes meet the design requirements.
Example two
The mix proportion design method of the asphalt pavement hot in-place recycling asphalt mixture is one of the cores of hot in-place recycling construction, because the climate, the terrain, the pavement condition, the construction condition and the like of the original pavement are different, the design of the recycling asphalt mixture has certain regional characteristics, and the type of the hot in-place recycling asphalt mixture is consistent with the type of the asphalt mixture on the upper layer of the original pavement in principle, or the hot in-place recycling asphalt mixture is allowed to be thicker than the type of the asphalt mixture on the upper layer of the original pavement by analyzing the information such as the gradation of the asphalt mixture on the upper layer of the original pavement, the traffic load grade, the engineering property, the traffic type information, the material variety and the like. The type of the newly added asphalt is preferably consistent with that of the asphalt in the RAP, or the newly added asphalt can be obtained by analyzing the information such as traffic load grade, engineering properties, traffic type information, material variety and the like.
And collecting representative old asphalt reclaimed materials (RAP) for extraction and screening to obtain the asphalt content in the old materials and the composition of old material mineral aggregate particles, which are used as the design basis of the target mixing ratio. According to the aging degree of old asphalt and the performance requirement of asphalt, a proper regenerant is selected, and the blending ratio of the regenerant is determined through tests. And determining the proportion of newly added aggregate of each grade according to the selected target grading range and the utilization ratio of the old Reclaimed Asphalt (RAP). The grading composition, asphalt content and asphalt property of the old asphalt reclaimed materials (RAP) have great influence on the recycled asphalt pavement, and are determined by performing tests for multiple times according to strict requirements.
The mineral aggregate grading, technical requirements and performance test of the hot in-place recycling mixture should meet the technical requirements of the corresponding hot-mix asphalt mixture type in JTG F40. In addition, in this embodiment, a mix proportion design method of the in-situ thermal regeneration asphalt mixture is specifically described in conjunction with the current situation of the asphalt pavement structure in shanxi. The design principle of the mixing ratio of the new asphalt mixture in the remixing type hot in-place recycling asphalt mixture is carried out according to JTG F40. The re-mixed regenerated asphalt mixture should be mixed with a certain proportion of new asphalt mixture to improve the gradation of mineral aggregate on the original pavement. The mixing proportion of the new asphalt mixture is preferably controlled within 30 percent of the quality of RAP. 1. In the embodiment, a mix proportion design method of the hot-in-place recycling asphalt mixture is verified by taking a remixed hot-in-place recycling project of a road section of a certain country as an example.
The road section of a certain national road is an asphalt concrete road, and the road surface of the road section is damaged to different degrees under the information of natural climate conditions, vehicle loads and the like along the road after years of operation. According to the design Specification for maintaining asphalt road surfaces of highways (JTG 5142), the road sections with the index of road surface damage condition PCI evaluated as 'middle' should adopt a functional repair scheme. The scheme of a 4cm pavement on the upper layer of the re-mixing type hot in-place recycling asphalt concrete with the addition of part of the new AC-16 type SBS modified asphalt mixture is proposed.
2.1 description of the materials
2.1.1 recycled old asphalt (RAP)
The waste asphalt reclaimed material (RAP) is an AC-16 asphalt concrete plate cut on the original pavement on site.
2.1.2 regenerants
The regenerant is asphalt regenerant purchased in the material market.
2.1.3 aggregates
The mix proportion design of the thermal regeneration mixture adopts 9.5-16mm, 4.75-9.5mm, 2.36-4.75mm and 0-2.36mm aggregates.
2.1.4 mineral powder
The mix proportion design of the thermal regeneration mixture adopts mineral powder provided by construction units.
2.2 sampling and evaluation of old asphalt reclaimed materials
2.2.1 grading of recycled asphalt and the amount of used asphalt
The old asphalt reclaimed material is burned according to the test procedure of T0727-1993(JTG E20) to determine the asphalt content and the gradation, so that the old asphalt content of the old asphalt reclaimed material is 4.60 percent (the oil-stone ratio is 4.82 percent), and the gradation analysis results are shown in the table 2 and the figure 2.
TABLE 2 old asphalt reclaimed material (RAP) grading and AC-16 grading Range requirements
Note: the grading range refers to the AC-16 grading range requirement in the guidance comments on the technology for preventing and controlling ruts on the asphalt pavement of expressways in Shaanxi province.
2.2.2 used asphalt recovery and regenerant dosage
The old bitumen recyclate is stripped and recovered according to the test protocol T0727-1993(JTG E20). Three indexes of the recycled old asphalt are tested, and the test results are shown in table 3.
2.3 Heat regeneration mix design
2.3.1 determination of the amount of regenerant added
Different dosages of regenerants (in percentage with the old asphalt) are added into the recovered old asphalt, and the asphalt performance recovery degree under various dosages is determined through three index tests of asphalt cement, and the test results are shown in a table 3.
TABLE 3 asphalt Properties after addition of different amounts of rejuvenating agent
The initial asphalt is numbered as No. 90, and when the blending ratio of the regenerant is 9% (calculated by percentage of the old asphalt), the asphalt performance of the asphalt meets the three indexes and requirements of the asphalt No. A-70, so that the blending ratio of the regenerant of the pavement is preliminarily determined to be 9% (calculated by percentage of the old asphalt).
2.3.2 determination of New Bituminous mixture mix proportions
The whole structure of the original pavement is thinner due to the serious loss of part of coarse aggregates, and the original gradation is finely adjusted and corrected by adopting an AC-16 type asphalt mixture. The results of the screening of the mineral aggregates used for the new bituminous mix proportions are shown in table 4.
TABLE 4 mineral aggregate screening results
| Sieve size (mm) | 9.5-16mm | 4.75-9.5mm | 2.36-4.75mm | 0-2.36mm | Mineral powder |
| 19 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 |
| 16 | 93.9 | 100.0 | 100.0 | 100.0 | 100.0 |
| 13.2 | 62.5 | 99.8 | 100.0 | 100.0 | 100.0 |
| 9.5 | 12.9 | 93.9 | 100.0 | 100.0 | 100.0 |
| 4.75 | 1.4 | 5.1 | 82.1 | 98.8 | 100.0 |
| 2.36 | 1.0 | 1.0 | 0.9 | 87.6 | 100.0 |
| 1.18 | 0.8 | 0.9 | 0.6 | 68.3 | 100.0 |
| 0.6 | 0.6 | 0.9 | 0.5 | 57.7 | 100.0 |
| 0.3 | 0.4 | 0.9 | 0.5 | 41.9 | 100.0 |
| 0.15 | 0.3 | 0.9 | 0.5 | 24.9 | 95.4 |
| 0.075 | 0.2 | 0.9 | 0.5 | 11.3 | 85.9 |
The material is used for carrying out the design of the grading curve of the asphalt mineral aggregate, and the mixing proportion of the AC-16 type asphalt mixture is as follows through trial mixing: 9.5-16 mm: 4.75-9.5 mm: 2.36-4.75 mm: 0-2.36 mm: the mineral powder is 45:19:6:27: 3. The grading curve is shown in detail in FIG. 3, and the composition grading of the new asphalt mixture is shown in Table 5.
TABLE 5 novel AC-16 asphalt mixture gradation composition and requirements
Note: the grading range refers to the AC-16 grading range requirement in the guidance comments on the technology for preventing and controlling ruts on the asphalt pavement of expressways in Shaanxi province.
The engineering record information of road surface deformation, rutting and similar projects is comprehensively considered, the adding proportion of the new asphalt mixture is preliminarily determined to be about 20% of the old asphalt mixture, namely the contents of the new asphalt mixture and the old asphalt reclaimed material in the synthesized hot recycled asphalt mixture are respectively 17% and 83%. The mixing proportion of the new aggregates is obtained by conversion according to the addition proportion of the new asphalt mixture, the contents of the new asphalt mixture and the old asphalt mixture in the synthesized hot recycled asphalt mixture and the like. The synthetic grading of the hot recycled asphalt mixture obtained according to the addition ratio is shown in Table 6, and the grading curve is shown in FIG. 4.
TABLE 6 grading composition and requirements for hot recycled asphalt mixture
Note: the grading range refers to the grading range requirement of 'technical Specification for road asphalt pavement construction' (JTG F40).
2.3.3 optimum asphalt dosage P of remixed regenerated asphalt mixturebIs determined
According to the road grade, climate information, road traffic type information and historical engineering construction information records of a certain national road section, the predicted asphalt usage value of the regenerated asphalt mixture is estimated to be 4.4% (the oilstone ratio is 4.6%), the asphalt usage values are added according to the oilstone ratio plus or minus 0.3 and plus or minus 0.6, and are 4.0%, 4.3%, 4.6%, 4.9% and 5.2%, the hot-recycling mixture mixing ratio Marshall new asphalt usage test is carried out according to the test procedure of T0727-1993(JTG E20), and the test results are shown in Table 7 and FIGS. 5-1 to 5-6. The optimal oilstone ratio of the remixed regenerated asphalt mixture is 4.6 percent, namely the optimal asphalt dosage Pb4.4%. The results of the Marshall test at the optimum asphalt loading are shown in Table 8.
TABLE 7 Marshall test results for hot mix recycling
TABLE 8 Marshall test results at optimum asphalt loading
2.3.4 asphalt dosage P of New asphalt mixturenbIs determined
Obtaining a calculated value P 'of asphalt dosage in the new asphalt mixture according to the formula I in the example I'nb4.3, finally determining the asphalt dosage P of the new asphalt mixture by taking the empirical record value of the optimal asphalt dosage of the prior AC-16 type asphalt mixture as referencenb＝4.3。
Determination of optimum New asphalt dosage K
The calculated value K' of the optimal new asphalt dosage obtained according to the formula II in the example I is 0.3 percent, and the newly added SBS modified asphalt is added according to the oil stone ratio of 0.1 percent, 0.3 percent, 0.5 percent and 0.7 percent respectively by taking the mass of RAP as a reference. The hot mix batch Marshall New asphalt dosage test was performed according to the test protocol T0727-1993(JTG E20), and the test results are shown in Table 9 and FIGS. 6-1 to 6-6. Considering that the Marshall volume index with the added new asphalt amount of 0.1 percent is close to the design target, the optimal new asphalt dosage (oilstone ratio) K is 0.1 percent according to the AC-16 Marshall mixing ratio design requirement and the design method of the hot mix asphalt mixture mixing ratio in the technical Specification for road asphalt pavement construction (JTG F40), and considering various variability factors existing in the actual construction, the new asphalt dosage can be increased by 0-0.2 percent. The results of the Marshall test at the optimum oilstone ratio are shown in Table 10.
TABLE 9 Marshall test results for hot mix recycling
TABLE 10 Marshall test results at optimum asphalt loading
3. Road performance test of remixed hot recycled mixture
The hot recycled asphalt mixture comprises the following components: the recycled asphalt mixture, 9 percent of the recycling agent (in percentage by mass of the old asphalt), 20 percent of the new asphalt mixture (in percentage by mass of the recycled asphalt mixture, the asphalt dosage of the new asphalt mixture is 4.3 percent) +0.1 percent of SBS modified asphalt (in percentage by mass of RAP) are prepared into test pieces, and the test pieces are subjected to rutting test, low-temperature bending test, water-soaking Marshall test and freeze-thaw splitting test respectively, so as to test the high-temperature stability, the low-temperature stability and the water stability of the recycled asphalt mixture under the optimal asphalt content. The test results are shown in Table 11.
TABLE 11 road performance test results for hot recycled asphalt mixture
| Item | Recycled asphalt mixture | Specification requirements | Conclusion |
| Residual stability (%) | 87.3 | ＞80 | Qualified |
| Freeze-thaw split strength ratio (%) | 82.5 | ＞75 | Qualified |
| Degree of dynamic stability (times/mm) | 6517 | ≥1000 | Qualified |
| Maximum bending strain epsilonB(με) | 2310.4 | ≥2000 | Qualified |
4. Conclusion
From the test results, the designed road performance of the hot recycled asphalt mixture mixing proportion meets the technical requirement of common AC-16 asphalt concrete Marshall design and the requirement of mixing proportion design inspection, and the mixing proportion design result is as follows: the recycled asphalt mixture comprises 9 percent of recycling agent (calculated by the mass percent of the old asphalt), 20 percent of new asphalt mixture (the asphalt dosage of the new asphalt mixture is 4.3 percent calculated by the mass percent of the recycled asphalt mixture), and 0.1 percent of SBS modified asphalt (calculated by the mass percent of RAP).
Because of the variation of the actual pavement construction uniformity and the maintenance repair material, the use amounts of the in-situ thermal regeneration construction process, the regenerant and the new asphalt mixture are finally determined by a test section, and the addition amounts of the regenerant and the modified asphalt can be properly adjusted according to the actual conditions on site in the construction process.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A mix proportion design method of a remixed in-situ heat regeneration asphalt mixture is characterized by comprising the following steps:
step 10, sampling a construction pavement to obtain an old asphalt reclaimed material;
step 20, determining old aggregate grading range and old asphalt content P based on the old asphalt reclaimed materialsobAnd an aging performance index; the aging performance index is the performance index of the old asphalt reclaimed material;
step 30, determining the mixing proportion of the regenerant based on the initial asphalt label, the regenerant, the aging performance index and the old asphalt of the construction pavement;
step 40, determining the blending proportion R of the new aggregate based on the grading range of the old aggregate and the target grading typenbBlending ratio R of recycled asphalt and old asphaltob(ii) a The target grading type is the same as or thicker than the initial grading type of the construction road surface by one model;
step 50, determining the optimal asphalt dosage P of the regenerated asphalt mixture based on the pavement information of the construction pavementb(ii) a Wherein the recycled asphalt mixture comprises the old asphalt reclaimed material, the regenerant, new asphalt and a new asphalt mixture;
step 60, based on the optimal asphalt dosage PbThe old asphalt content PobThe blending ratio R of the old asphalt reclaimed materialobThe blending ratio R of the new aggregatenbDetermining the asphalt consumption P of the new asphalt mixture according to the pavement information and the target grading typenb；
Step 70, based on the optimal asphalt dosage PbThe old asphalt content PobThe blending ratio R of the old asphalt reclaimed materialobThe blending ratio R of the new aggregatenbAnd the amount of said bitumen PnbDetermining the optimal new asphalt dosage K;
step 80, mixing proportion R based on the new aggregatenbThe blending ratio R of the old asphalt reclaimed materialobThe blending proportion of the regenerant and the optimal asphalt dosage PbThe amount of the asphalt PnbAnd the optimal new asphalt dosage K, and determining the mixing proportion of the regenerated asphalt mixture.
2. The design method of claim 1, wherein the step 10 comprises:
step 101, dividing the construction road surface into a plurality of sub road sections based on the road surface structure and the historical maintenance records of the construction road surface;
and 102, determining the position of a sampling point for each sub-section based on a random sampling method, and sampling at the position to obtain the old asphalt reclaimed material.
3. The design method of claim 2, wherein said step 20 comprises:
step 201, dividing the old asphalt reclaimed material into a combustion sample, an extraction sample and a test sample;
step 202, processing the combustion sample by adopting a combustion experiment method or an extraction experiment method to obtain the old aggregate, and determining the content of the old asphalt;
step 203, determining the grading range of the old aggregates based on the old aggregates;
step 204, processing the extracted sample by adopting an extraction experimental method to obtain the old asphalt;
step 205, determining the aging performance index based on the old asphalt.
4. A design method according to claim 3, wherein said step 30 comprises:
step 301, determining an old asphalt label based on the aging performance index;
step 302, determining a target label of a regenerated asphalt sample based on the initial asphalt label of the construction pavement;
step 303, doping a plurality of regenerants with different preset proportions into the old asphalt by a trial-and-error method based on the old asphalt label and the target label to obtain a plurality of regenerated asphalt samples;
and 304, detecting the performance indexes of a plurality of regenerated asphalt samples, and determining the preset proportion of the corresponding regenerants in the regenerated asphalt samples meeting the performance indexes of the target labels as the blending proportion of the regenerants.
5. The design method according to any one of claims 1 to 4, wherein the step 50 comprises:
step 501, determining estimated optimal asphalt consumption of at least five regenerated asphalt mixtures based on the pavement information of the construction pavement;
step 502, performing a marshall test based on the oilstone ratios respectively corresponding to the at least five estimated optimal asphalt dosages and the test sample to obtain a first test result;
step 503, determining the optimal asphalt dosage P based on the Marshall test standard value and the first test result of the target grading typeb。
6. The design method of claim 5, wherein the step 60 comprises:
step 601, based on the optimal asphalt dosage PbThe content of the old asphaltPobThe blending ratio R of the old asphalt reclaimed materialobAnd the blending proportion R of the new aggregatenbDetermining the calculated value P 'of the asphalt dosage'nbWherein
step 602, determining an asphalt usage prediction value P' of the new asphalt mixture based on the road surface information and the target gradation typenb；
Step 603, calculating the asphalt dosage value P'nbAnd an estimated asphalt quantity P ″)nbIs determined as the amount of said bitumen Pnb。
7. The design method of claim 6, wherein said step 70 comprises:
step 701, based on the optimal asphalt dosage PbThe old asphalt content PobThe blending ratio R of the old asphalt reclaimed materialobThe blending ratio R of the new aggregatenbAnd the amount of said bitumen PnbDetermining the calculated value K' of the optimal new asphalt dosage, wherein,
step 702, determining at least five optimal new asphalt dosage pre-estimated values based on the optimal new asphalt dosage calculation value K';
step 703, performing a marshall test based on the oil-stone ratios respectively corresponding to at least five of the optimal new asphalt usage prediction values and the test sample to obtain a second test result;
step 704, determining the optimal new asphalt dosage K based on the marshall test standard value of the target grading type and the second test result.
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| CN114093439A (en) * | 2021-11-03 | 2022-02-25 | 群康(上海)新材料科技有限公司 | Design method of plant-mixed hot recycled asphalt mixture with high proportion RAP |
| CN116187986A (en) * | 2023-04-21 | 2023-05-30 | 中南大学 | Application method of asphalt mixture reclaimed material |
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