CN112159157A - Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof - Google Patents
Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof Download PDFInfo
- Publication number
- CN112159157A CN112159157A CN202011099513.4A CN202011099513A CN112159157A CN 112159157 A CN112159157 A CN 112159157A CN 202011099513 A CN202011099513 A CN 202011099513A CN 112159157 A CN112159157 A CN 112159157A
- Authority
- CN
- China
- Prior art keywords
- asphalt
- rubber
- waste
- asphalt mixture
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 144
- 239000000203 mixture Substances 0.000 title claims abstract description 94
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 87
- 238000000034 method Methods 0.000 claims abstract description 46
- 239000011387 rubberized asphalt concrete Substances 0.000 claims abstract description 34
- 239000012492 regenerant Substances 0.000 claims abstract description 31
- 239000011230 binding agent Substances 0.000 claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 239000003921 oil Substances 0.000 claims description 9
- 239000010920 waste tyre Substances 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 206010042674 Swelling Diseases 0.000 claims description 3
- 238000011161 development Methods 0.000 claims description 3
- 239000000839 emulsion Substances 0.000 claims description 3
- 125000005456 glyceride group Chemical group 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 239000010705 motor oil Substances 0.000 claims description 3
- 238000002390 rotary evaporation Methods 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 230000008961 swelling Effects 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 abstract description 11
- 239000011384 asphalt concrete Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000011160 research Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000005056 compaction Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000013557 residual solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the field of regenerated asphalt, in particular to a wet-process direct-vat-set rubber-regenerated asphalt mixture and a preparation method thereof, wherein the wet-process direct-vat-set rubber-regenerated asphalt mixture comprises the following components in parts by weight: 3.5-4.8 parts of asphalt-rubber binder, 10-30 parts of waste asphalt mixture, 50-70 parts of new aggregate and 3-5 parts of mineral powder; the waste asphalt mixture also contains a regenerant, and the regenerant accounts for 7-15% of the weight of asphalt in the waste asphalt mixture. The invention effectively utilizes a great amount of waste asphalt mixture and waste rubber tires to prepare the asphalt concrete which meets the engineering requirements and has good road performance, and the mixture is suitable for newly-built, reconstructed and expanded engineering which takes the asphalt mixture as a surface layer structure, is suitable for any structural level of roads of various grades, and greatly increases the economic benefit and the environmental protection benefit.
Description
Technical Field
The invention relates to the field of reclaimed asphalt, in particular to a wet-process direct-vat-set rubber-reclaimed asphalt mixture and a preparation method thereof.
Background
China has obtained certain research results on the research of recycling of asphalt pavements, but the technology of recycling of asphalt pavements is developed late in China, and the research on the application of reclaimed materials on high-grade roads is insufficient. At present, as China does not completely master the regeneration technology of the old asphalt pavement, few asphalt regeneration equipment for engineering popularization and application exist, and the huge old asphalt concrete layers can only be abandoned in vain after being dug, so that resources are wasted, and the environment is seriously polluted. In the same way, the utilization of waste rubber tires is a difficult problem, the speed of the waste tires generated in China at present is rapidly increased by 8% -10%, and a large amount of waste tires bring about the problems of large occupied space, low utilization rate, difficult recovery and treatment and the like.
However, the research on both the recycled asphalt mixture pavement and the rubber asphalt mixture pavement has been reported in China and abroad about the research and application of "double wastes" combining waste rubber crumbs and waste asphalt mixtures. Therefore, the invention researches the application of the asphalt-rubber binding material produced by adopting the waste rubber scraps and the matrix asphalt in the aspect of regenerating the asphalt mixture from the aspects of simple and easy operation and optimal utilization of waste regeneration.
Disclosure of Invention
Aiming at the problems, the invention provides a wet-process direct-vat rubber-recycled asphalt mixture which comprises the following components in parts by weight:
3.5-4.8 parts of asphalt-rubber binder, 10-30 parts of waste asphalt mixture, 50-70 parts of new aggregate and 3-5 parts of mineral powder;
the waste asphalt mixture also contains a regenerant, and the regenerant accounts for 7-15% of the weight of asphalt in the waste asphalt mixture.
The invention also aims to provide a preparation method of the wet direct vat set rubber-reclaimed asphalt mixture, which comprises the following steps:
step 1, setting an aggregate pre-grading treatment system:
crushing and grading the waste asphalt mixture recovered from the road surface by using an impact crushing and screening system to obtain a premixed and graded waste material;
determining the asphalt content of each level of waste materials and the particle composition of the recovered mineral aggregate by adopting a method for recovering asphalt for the premixed and classified waste materials;
step 3, determining the regenerant and the mixing amount thereof:
and adjusting the performance of the recycled asphalt through a compatibility test of the recycled asphalt and the regenerant, and determining the optimal mixing amount of the regenerant.
Step 4, preparing the asphalt-rubber binding material:
blending waste tire rubber scraps and matrix asphalt by a rubber asphalt production system for swelling development to obtain an asphalt-rubber binder;
step 5, discharging a finished product:
weighing new aggregates in a metering manner, heating, then sequentially adding the waste materials and the regenerants at all levels, the asphalt-rubber binder and the mineral powder, uniformly mixing, and then discharging to obtain a wet-process direct-vat rubber-recycled asphalt mixture; wherein, stirring is required after each addition.
Preferably, in the step 1, the waste asphalt mixture is graded according to the oil-containing particle size: fine waste materials with oil-containing particle size of 0-6 mm and coarse waste materials with oil-containing particle size of 6-16 mm.
Preferably, in the step 2, the asphalt is recovered by a rotary evaporation method.
Preferably, in the step 2, in the waste material, the weight percentage of the fine waste material is 40% to 60%, and the balance is the coarse waste material.
Preferably, in the step 3, the regenerant is a normal-temperature emulsion asphalt regenerant and consists of the following raw materials in parts by weight: 50-62 parts of waste engine oil, 8-15 parts of a surfactant, 10-15 parts of desulfurized rubber powder and 13-25 parts of a glyceride material.
Preferably, in the step 3, the mixing and stirring time of the regenerant added into the waste material is 5-10 s.
Preferably, in the step 4, the rubber crumbs account for 15% to 22% of the total weight of the asphalt-rubber binder.
Preferably, in the step 4, the content of ash in the waste tire rubber crumb is not more than 8%, the content of acetone extract is 6-16%, and the content of hydrocarbon is 42-65%.
Preferably, in the step 4, the diameter of the screened mesh of the rubber crumb is 0.075-2.36 mm.
More preferably, in the step 4, when the screen hole diameter of the screened rubber crumb is 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm or 0.075mm, the passing percentage of the rubber crumb is 100%, 95-100%, 48-70%, 5-20%, 0-6% or 0-2%.
Preferably, in the step 4, the asphalt-rubber binder is produced by a batch type production process, and the production process comprises the following steps:
(1) heating the matrix asphalt to 190-210 ℃;
(2) weighing rubber crumbs according to the amount, adding the rubber crumbs into the matrix asphalt obtained in the step (1) for premixing;
(3) after the rubber crumbs are swelled and developed, preserving the heat at the temperature of 180-210 ℃ and reacting for 45-60 min.
Preferably, an additive is further added in the step 4.
Preferably, in the step 4, the Haake viscosity of the asphalt-rubber binder is 1.5-4.0 Pa.s, the cone penetration (25 ℃) is 25-40 (0.1mm), the rebound resilience (25 ℃) is not less than 30%, and the softening point is not less than 65 ℃.
Preferably, in the step 5, the waste asphalt mixture is added by a direct vat set method, and the stirring time after the addition is 10-20 s.
Preferably, in the step 5, the asphalt-rubber binder is added and then stirred for 30-45 s, and the mineral powder is added and then stirred for 5-10 s.
Preferably, in step 5, the new aggregates comprise coarse aggregates and fine aggregates; wherein the weight ratio of the coarse aggregate to the fine aggregate is 50-70 percent and 10-30 percent.
Preferably, in the step 5, the heating treatment temperature of the new aggregate is 200-220 ℃; the production temperature after the waste asphalt mixture is put into the furnace is 175-185 ℃; the production temperature after the asphalt-rubber binder is put into the reactor is 180-210 ℃; the discharging temperature of the finished product is 170-185 ℃.
The invention has the beneficial effects that:
1. the invention provides a mixture of wet-process direct-vat rubber and recycled asphalt and a preparation method thereof, which effectively utilizes a great amount of waste asphalt mixture and waste rubber tires to prepare asphalt concrete with good road performance meeting engineering requirements.
2. In the preparation method of the mixture of the wet process direct-batch rubber and the recycled asphalt, the waste asphalt mixture (RAP) in the step 1 is a mixture which is obtained by crushing and screening an old asphalt pavement and has excellent uniform particle size and no tension and crack, and the premixing effect is realized in the crushing and screening process, so that the realization of the mix proportion design of the recycled asphalt mixture is facilitated, and the variability of the recycled material is reduced. The asphalt collection method in the step 2 adopts a rotary evaporator method to recover the old asphalt, has higher efficiency, less residual solvent and smaller variation coefficient of the viscosity of the recovered asphalt, can embody the performance of the old asphalt and explore the aging rule of the recovered asphalt on the basis. The direct-throwing method used in the step 5 can avoid the defects that the old material asphalt is aged and burnt due to open flame heating and the performance of the old material is changed due to the slow heating speed of air, can fully utilize the waste heat of the new material and greatly save the equipment investment.
3. The recycled materials of the milled old asphalt pavement transported back to the factory are subjected to old asphalt recycling and performance testing, aggregate performance testing and variability test research, the mixture indoor mix proportion design is based on a Marshall test method, multi-factor optimization is carried out to obtain the optimal combination, reasonable old material mixing rate is determined by combining grading, performance requirements and economy of the recycled asphalt mixture, and the recycled asphalt mixture with low cost and excellent comprehensive performance is prepared and applied to various surface layers of asphalt pavements and SMA.
4. Compared with a dry method, the wet method can reduce the addition cost of the modifier, the excellent performance of the rubber scraps is exerted more fully, the plasticity of the rubber scraps added into the asphalt is partially recovered, the elasticity and viscosity of the asphalt are improved, the temperature sensitivity is improved, the asphalt-rubber binding material plays a role in regeneration in the asphalt mixture, the temperature sensitivity of the mixture and the activity and flexibility of the aged asphalt of the waste material can be improved, the fusion degree of the new asphalt and the old asphalt is increased, so that the mixture has higher fatigue resistance and better anti-rutting capability, the influence of the waste material on the fatigue life of the mixture is overcome, the construction workability of the mixture is improved, the compaction forming is easy, and the pavement performance is good.
5. The waste materials contain more waste asphalt, and the waste asphalt acts with a regenerant and an asphalt-rubber binding material when the mixture is stirred, so that the consumption of the asphalt is reduced, the waste materials are utilized, and the cost is saved. The mixture paved road surface has good temperature stability, good road effect, raw material saving, and greatly reduced engineering cost, realizes the high-efficiency comprehensive utilization of waste asphalt mixture and waste rubber bits, provides important technical guarantee for the popularization and application of plant-mixed heat regeneration technology, and has obvious social and economic benefits.
6. In the road industry, a large amount of modified materials are used for improving the performance of asphalt, improving the physical and mechanical properties of asphalt mixtures and further improving the service performance of pavements. The rubber scraps made of waste tires are one of modified materials, and can be added into asphalt to prepare rubber asphalt for improving the performance of the asphalt. In the face of double pressure of environmental pollution and resource shortage, a direct-batch plant-mixed hot recycling technology and a rubber asphalt technology are combined, so that efficient comprehensive utilization of waste asphalt mixture and waste rubber scraps, namely 'double wastes', is realized, and a rubber-recycled asphalt mixture with high quality and low cost is developed. The technology can save a large amount of building materials, save energy, is more favorable for protecting ecological environment, and can open up a new road in the fields of asphalt road construction, energy conservation, environmental protection and circular economy.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a process flow diagram of a wet process direct batch rubber-reclaimed asphalt mixture according to the present invention;
FIG. 2 is a graph of the AC-20C (RAP incorporation 20%) grading profile prepared according to the present invention;
FIG. 3 is a graph of the grading profile of SMA-13(RAP doped 20%) prepared in accordance with the present invention.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
The wet process direct-throwing rubber-regenerated asphalt mixture consists of the following components in parts by weight:
3.5-4.8 parts of asphalt-rubber binder, 10-30 parts of waste asphalt mixture, 50-70 parts of new aggregate and 3-5 parts of mineral powder;
the waste asphalt mixture also contains a regenerant, and the regenerant accounts for 7-15% of the weight of asphalt in the waste asphalt mixture.
Example 2
A preparation method of a wet-process direct-vat-set rubber-reclaimed asphalt mixture comprises the following steps:
step 1, setting an aggregate pre-grading treatment system:
crushing and grading the waste asphalt mixture recovered from the road surface by using an impact crushing and screening system to obtain a premixed and graded waste material;
determining the asphalt content of each level of waste materials and the particle composition of the recovered mineral aggregate by adopting a method for recovering asphalt for the premixed and classified waste materials;
step 3, determining the regenerant and the mixing amount thereof:
and adjusting the performance of the recycled asphalt through a compatibility test of the recycled asphalt and the regenerant, and determining the optimal mixing amount of the regenerant.
Step 4, preparing the asphalt-rubber binding material:
blending waste tire rubber scraps and matrix asphalt by a rubber asphalt production system for swelling development to obtain an asphalt-rubber binder;
step 5, discharging a finished product:
weighing new aggregates in a metering manner, heating, then sequentially adding the waste materials and the regenerants at all levels, the asphalt-rubber binder and the mineral powder, uniformly mixing, and then discharging to obtain a wet-process direct-vat rubber-recycled asphalt mixture; wherein, stirring is required after each addition.
In the step 1, the waste asphalt mixture is graded according to the oil-containing particle size: fine waste materials with oil-containing particle size of 0-6 mm and coarse waste materials with oil-containing particle size of 6-16 mm.
In the step 2, the recovery method of the asphalt is a rotary evaporation method.
In the step 2, the weight percentage of the fine waste material in the waste material is 40-60%, and the balance is the coarse waste material.
In the step 3, the regenerant is a normal-temperature emulsion asphalt regenerant and comprises the following raw materials in parts by weight: 50-62 parts of waste engine oil, 8-15 parts of a surfactant, 10-15 parts of desulfurized rubber powder and 13-25 parts of a glyceride material.
In the step 3, the mixing and stirring time of the regenerant added into the waste materials is 5-10 s.
In the step 3, the regenerant accounts for 7-15% of the mass of the aged asphalt in the waste materials.
In the step 4, the rubber scraps account for 15-22% of the total weight of the asphalt-rubber binder.
In the step 4, the ash content in the waste tire rubber scraps is not more than 8%, the acetone extract content is 6% -16%, and the hydrocarbon content is 42% -65%.
In the step 4, the asphalt-rubber binder adopts a batch type production process, and the production process comprises the following steps:
(1) heating the matrix asphalt to 190-210 ℃;
(2) weighing rubber crumbs according to the amount, adding the rubber crumbs into the matrix asphalt obtained in the step (1) for premixing;
(3) after the rubber crumbs are swelled and developed, preserving the heat at the temperature of 180-210 ℃ and reacting for 45-60 min.
And an additive is also added in the step 4.
In the step 4, the Haake viscosity of the asphalt-rubber binding material is 1.5-4.0 Pa.s, the cone penetration (25 ℃) is 25-40 (0.1mm), the rebound recovery (25 ℃) is not less than 30%, and the softening point is not less than 65 ℃.
In the step 5, the waste asphalt mixture is added by a direct vat set method, and the stirring time after the addition is 10-20 s.
In the step 5, the asphalt-rubber binder is added and then stirred for 30-45 s, and the mineral powder is added and then stirred for 5-10 s.
In the step 5, the new aggregates comprise coarse aggregates and fine aggregates; wherein the weight ratio of the coarse aggregate to the fine aggregate is 50-70 percent and 10-30 percent.
In the step 5, the heating treatment temperature of the new aggregate is 200-220 ℃; the production temperature after the waste asphalt mixture is put into the furnace is 175-185 ℃; the production temperature after the asphalt-rubber binder is put into the reactor is 180-210 ℃; the discharging temperature of the finished product is 170-185 ℃.
Example 3
The middle surface layer AC-20C and the upper surface layer SMA-13 of a road surface both adopt rubber-recycled asphalt mixture, wherein the middle surface layer AC-20C comprises the following components in parts by weight:
3.5-4.8 parts of asphalt-rubber binder, 20 parts of waste asphalt mixture, 50-70 parts of new aggregate, 3-5 parts of mineral powder and 0.03-0.2 part of regenerant.
Wherein the rubber scrap in the asphalt-rubber binder accounts for 15%;
the upper surface layer SMA-13 comprises the following components in parts by weight:
3.5-4.8 parts of asphalt-rubber binder, 20 parts of waste asphalt mixture, 50-70 parts of new aggregate and 3-5 parts of mineral powder.
Wherein the proportion of rubber scraps in the asphalt-rubber binder is 18 percent; the regenerant accounts for 10% of the weight of the asphalt in the waste asphalt mixture.
The new aggregate meets the requirements of technical Specification for construction of road asphalt pavements JTG F40-2004.
When the production construction is carried out according to the method of the embodiment 2 of the invention, the pavement performance and various indexes all meet the requirements of the specification and the design drawing.
For a more clear illustration of the invention, the performance test of the middle surface layer AC-20C and the upper surface layer SMA-13 prepared in the embodiment 3 of the invention is performed, and the results are shown in tables 1-7.
Wherein, the table 1 shows the composition of the waste material gradation in the process of preparing the middle surface layer AC-20C in the embodiment 3 of the invention;
table 2 shows the composition of the waste material gradation in the process of preparing the upper SMA-13 layer in example 3 of the present invention;
table 3 shows the results of the blend ratio of the middle surface layer AC-20C prepared in example 3 of the present invention;
table 4 shows the results of the compounding ratio of SMA-13 of the upper layer prepared in example 3 of the present invention;
table 5 shows the comparison result of the technical performance of the asphalt mixture of the middle surface layer AC-20C prepared in the example 3 of the invention;
table 6 shows the comparison result of the technical properties of the asphalt mixture of the upper SMA-13 prepared in example 3 of the invention;
table 7 shows the results of road surface inspection of the upper layer SMA-13 prepared in example 3 of the present invention.
TABLE 1 gradation composition of AC-20C
| Mesh size (mm) | 26.5 | 19 | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| RAP incorporation 20% pass rate | 100 | 94.5 | 85.8 | 76.3 | 58.0 | 31.2 | 21.6 | 17.6 | 13.8 | 11.0 | 8.0 | 5.3 |
TABLE 2 graduation composition of SMA-13
| Mesh size (mm) | 16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| RAP incorporation 20% pass rate | 100 | 94.8 | 62.5 | 27.3 | 20.9 | 18.3 | 16.0 | 14.0 | 11.7 | 9.0 |
TABLE 3 summary of the results of the AC-20C mix ratios
TABLE 4 summary of SMA-13 mix ratio results
TABLE 5 comparison of technical Properties of AC-20C asphalt mixtures
TABLE 6 comparison of technical Properties of AC-13C asphalt mixtures
TABLE 7 summary of SMA-13 pavement inspection results
| Examination item | Actually measured mathematical statistics | Quality requirement or tolerance deviation |
| Degree of compaction (%) | 97.3 | ≥94 |
| Flatness (mm) | 0.92 | ≤1.2 |
| Construction depth (mm) | 0.62 | ≥0.55 |
| Water permeability coefficient (mL/min) | 68.3 | ≤200 |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The wet-process direct-vat rubber-recycled asphalt mixture is characterized by comprising the following components in parts by weight:
3.5-4.8 parts of asphalt-rubber binder, 10-30 parts of waste asphalt mixture, 50-70 parts of new aggregate and 3-5 parts of mineral powder;
the waste asphalt mixture also contains a regenerant, and the regenerant accounts for 7-15% of the weight of asphalt in the waste asphalt mixture.
2. The method for preparing the wet process direct vat rubber-reclaimed asphalt mixture according to claim 1, comprising the steps of:
step 1, setting an aggregate pre-grading treatment system:
crushing and grading the waste asphalt mixture recovered from the road surface by using an impact crushing and screening system to obtain a premixed and graded waste material;
step 2, determining the asphalt content and the gradation of the waste materials:
determining the asphalt content of each level of waste materials and the particle composition of the recovered mineral aggregate by adopting a method for recovering asphalt for the premixed and classified waste materials;
step 3, determining the regenerant and the mixing amount thereof:
and adjusting the performance of the recycled asphalt through a compatibility test of the recycled asphalt and the regenerant, and determining the optimal mixing amount of the regenerant.
Step 4, preparing the asphalt-rubber binding material:
blending waste tire rubber scraps and matrix asphalt by a rubber asphalt production system for swelling development to obtain an asphalt-rubber binder;
step 5, discharging a finished product:
weighing new aggregates in a metering manner, heating, then sequentially adding the waste materials and the regenerants at all levels, the asphalt-rubber binder and the mineral powder, uniformly mixing, and then discharging to obtain a wet-process direct-vat rubber-recycled asphalt mixture; wherein, stirring is required after each addition.
3. The preparation method of the wet process direct batch rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 1, the waste asphalt mixture is classified according to the oil-containing particle size: fine waste materials with oil-containing particle size of 0-6 mm and coarse waste materials with oil-containing particle size of 6-16 mm.
4. The method for preparing a wet process direct vat rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 2, the asphalt recovery method is a rotary evaporation method.
5. The preparation method of the wet process direct batch rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 2, the weight percentage of the fine waste material is 40-60%, and the balance is the coarse waste material.
6. The preparation method of the wet process direct vat set rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 3, the regenerant is a normal temperature emulsion asphalt regenerant, and the regenerant comprises the following raw materials in parts by weight: 50-62 parts of waste engine oil, 8-15 parts of a surfactant, 10-15 parts of desulfurized rubber powder and 13-25 parts of a glyceride material.
7. The preparation method of the wet process direct batch rubber-recycled asphalt mixture according to claim 2, wherein in the step 3, the mixing and stirring time of the regenerant added to the waste materials is 5-10 s.
8. The method for preparing the wet process direct batch rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 4, the rubber crumbs account for 15-22% of the total weight of the asphalt-rubber binder; the content of ash in the waste tire rubber scraps is not more than 8 percent, the content of acetone extract is 6 to 16 percent, and the content of hydrocarbon is 42 to 65 percent.
9. The preparation method of the wet process direct vat rubber-reclaimed asphalt mixture according to claim 2, wherein in the step 4, the asphalt-rubber binder adopts a batch type production process, and the production process comprises the following steps:
(1) heating the matrix asphalt to 190-210 ℃;
(2) weighing rubber crumbs according to the amount, adding the rubber crumbs into the matrix asphalt obtained in the step (1) for premixing;
(3) after the rubber crumbs are swelled and developed, preserving the heat at the temperature of 180-210 ℃ and reacting for 45-60 min.
10. The preparation method of the wet process direct batch rubber-recycled asphalt mixture according to claim 2, wherein in the step 5, the waste asphalt mixture is added by a direct batch method, and the stirring time is 10-20 s after the addition; stirring for 30-45 s after adding the asphalt-rubber binder, and stirring for 5-10 s after adding mineral powder; the new aggregate comprises coarse aggregate and fine aggregate; wherein, the weight ratio of the coarse aggregate to the fine aggregate is 50-70 percent to 10-30 percent; the heating treatment temperature of the new aggregate is 200-220 ℃; the production temperature after the waste asphalt mixture is put into the furnace is 175-185 ℃; the production temperature after the asphalt-rubber binder is put into the reactor is 180-210 ℃; the discharging temperature of the finished product is 170-185 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099513.4A CN112159157A (en) | 2020-10-14 | 2020-10-14 | Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011099513.4A CN112159157A (en) | 2020-10-14 | 2020-10-14 | Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112159157A true CN112159157A (en) | 2021-01-01 |
Family
ID=73866952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011099513.4A Pending CN112159157A (en) | 2020-10-14 | 2020-10-14 | Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112159157A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112960940A (en) * | 2021-02-07 | 2021-06-15 | 枣阳市锦烨节能建材有限公司 | Recycled asphalt concrete and preparation method thereof |
| CN116444201A (en) * | 2023-03-15 | 2023-07-18 | 镇江市规划勘测设计集团有限公司 | SMA rubber asphalt mixture internally doped with rubber powder and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807514A (en) * | 2006-02-16 | 2006-07-26 | 同济大学 | Method for preparing modified asphalt mixture using waste and old tyre and hybrid method |
| RU2012125141A (en) * | 2012-06-18 | 2014-01-20 | РМ Интернейшнл Холдингс Питиуай. Лтд. | BITUMINO-RUBBER COMPOSITION OF BINDER FOR ROAD COVERING AND METHOD FOR PRODUCING IT |
| CN105801011A (en) * | 2016-04-05 | 2016-07-27 | 武汉理工大学 | Hot-recycling asphalt mixture containing non-traditional oil and preparation method of hot-recycling asphalt mixture |
| CN106221253A (en) * | 2016-08-29 | 2016-12-14 | 四川知行路桥集团有限公司 | A kind of production technology of waste and old rubber modified asphalt regeneration |
| CN106242378A (en) * | 2016-07-15 | 2016-12-21 | 黑龙江省中信路桥材料有限公司 | Hot in-plant reclaimed asphalt mixture and preparation method thereof |
| CN107057264A (en) * | 2017-06-14 | 2017-08-18 | 重庆中加沥青技术服务有限公司 | A kind of asphalt delivers directly masterbatch |
| CN111747683A (en) * | 2020-06-29 | 2020-10-09 | 上海佳砼新材料科技发展有限公司 | Hot-mix-in-plant asphalt mixture and preparation method thereof |
-
2020
- 2020-10-14 CN CN202011099513.4A patent/CN112159157A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807514A (en) * | 2006-02-16 | 2006-07-26 | 同济大学 | Method for preparing modified asphalt mixture using waste and old tyre and hybrid method |
| RU2012125141A (en) * | 2012-06-18 | 2014-01-20 | РМ Интернейшнл Холдингс Питиуай. Лтд. | BITUMINO-RUBBER COMPOSITION OF BINDER FOR ROAD COVERING AND METHOD FOR PRODUCING IT |
| CN105801011A (en) * | 2016-04-05 | 2016-07-27 | 武汉理工大学 | Hot-recycling asphalt mixture containing non-traditional oil and preparation method of hot-recycling asphalt mixture |
| CN106242378A (en) * | 2016-07-15 | 2016-12-21 | 黑龙江省中信路桥材料有限公司 | Hot in-plant reclaimed asphalt mixture and preparation method thereof |
| CN106221253A (en) * | 2016-08-29 | 2016-12-14 | 四川知行路桥集团有限公司 | A kind of production technology of waste and old rubber modified asphalt regeneration |
| CN107057264A (en) * | 2017-06-14 | 2017-08-18 | 重庆中加沥青技术服务有限公司 | A kind of asphalt delivers directly masterbatch |
| CN111747683A (en) * | 2020-06-29 | 2020-10-09 | 上海佳砼新材料科技发展有限公司 | Hot-mix-in-plant asphalt mixture and preparation method thereof |
Non-Patent Citations (6)
| Title |
|---|
| 吴春颖等: "橡胶沥青再生旧沥青路面技术应用研究", 《重庆交通大学学报(自然科学版)》 * |
| 吴春颖等: "橡胶沥青再生旧沥青路面技术应用研究", 《重庆交通大学学报(自然科学版)》, vol. 34, no. 1, 28 February 2015 (2015-02-28), pages 64 * |
| 天津市科技史志编修办公室: "《沥青路面厂拌热再生关键技术》", 北京：中国建材工业出版社, pages: 187 * |
| 天津市科技史志编修办公室: "《沥青路面厂拌热再生关键技术》", 南京：东南大学出版社 * |
| 广东交通科技成果摘编: "广东省沥青路面再生推广应用技术研究", 《广东公路交通》, no. 2, 31 December 2018 (2018-12-31), pages 65 * |
| 李农等: "《公路工程材料试验手册》", 30 April 2003, 北京：人民交通出版社, pages: 838 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112960940A (en) * | 2021-02-07 | 2021-06-15 | 枣阳市锦烨节能建材有限公司 | Recycled asphalt concrete and preparation method thereof |
| CN116444201A (en) * | 2023-03-15 | 2023-07-18 | 镇江市规划勘测设计集团有限公司 | SMA rubber asphalt mixture internally doped with rubber powder and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107698199B (en) | High-modulus asphalt mixture based on old pavement milling material and preparation method thereof | |
| CN102786257B (en) | Plant-mixed thermally-modified asphalt regenerated mix and preparation method thereof | |
| CN113698139B (en) | High-doping-amount RAP plant-mixed hot-recycling modified asphalt mixture and preparation method thereof | |
| CN112125575B (en) | High-efficiency regenerated asphalt mixture and preparation process thereof | |
| CN112358223B (en) | Warm-mixing agent, regenerant and preparation method of warm-mixing regenerated asphalt mixture | |
| CN103113044B (en) | High-modulus bituminous mixture admixed with waste material, preparation method and method for preparing mixture specimen | |
| CN111233374B (en) | Asphalt mastic macadam mixture using recycled fan blade waste as filler | |
| CN109265054A (en) | Ultra-thin wearing layer bituminous mixture and preparation method thereof | |
| CN109608093B (en) | A kind of Recycled Asphalt Pavement and preparation method thereof | |
| CN107651887B (en) | High-modulus rubber asphalt mixture and preparation method thereof | |
| CN101235172A (en) | Asphalt pavement rubber plastic composite anti-rut agent and preparation method thereof | |
| CN111747683A (en) | Hot-mix-in-plant asphalt mixture and preparation method thereof | |
| CN111739593A (en) | Design method for mix proportion of warm-mix high-volume recycled asphalt mixture | |
| CN109293281B (en) | Modified asphalt mixture and preparation method thereof | |
| CN112159157A (en) | Wet direct-vat rubber-recycled asphalt mixture and preparation method thereof | |
| CN104119032A (en) | A regenerating method of an SBS asphalt mixture with a high RAP mixing amount | |
| CN101265053A (en) | Asphalt-enriched discontinuous gradation rubber asphalt mixture | |
| CN114538827A (en) | Mixture of polymer composite rubber modified asphalt high-performance steel slag ultrathin wearing layer | |
| CN114380539B (en) | Asphalt cold-patch material prepared from recycled glass fiber reinforced plastics | |
| CN108947328B (en) | Steel slag permeable asphalt mixture based on waste rubber powder modified high-viscosity asphalt | |
| CN105801011A (en) | Hot-recycling asphalt mixture containing non-traditional oil and preparation method of hot-recycling asphalt mixture | |
| CN113698138B (en) | high-RAP-content regeneration mixture and preparation method and application thereof | |
| CN106398242B (en) | Miberal powder and waste tyre pyrolytic oil and rubber powder production high performance modified bitumen method and its product are recycled using asphalt mixing plant | |
| CN115231857B (en) | Method for improving aging performance of asphalt pavement material through layered modification | |
| CN114292066B (en) | High-strength foam asphalt cold-recycling mixture and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210101 |