CN115521629A - Maintenance special asphalt and preparation method thereof - Google Patents
Maintenance special asphalt and preparation method thereof Download PDFInfo
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- CN115521629A CN115521629A CN202211310903.0A CN202211310903A CN115521629A CN 115521629 A CN115521629 A CN 115521629A CN 202211310903 A CN202211310903 A CN 202211310903A CN 115521629 A CN115521629 A CN 115521629A
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- asphalt
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- 239000010426 asphalt Substances 0.000 title claims abstract description 89
- 238000012423 maintenance Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 239000003607 modifier Substances 0.000 claims abstract description 29
- 230000032683 aging Effects 0.000 claims abstract description 19
- 230000035515 penetration Effects 0.000 claims abstract description 17
- 230000007774 longterm Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000012467 final product Substances 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims abstract description 3
- 230000008018 melting Effects 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 17
- 239000010920 waste tyre Substances 0.000 claims description 17
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 239000004793 Polystyrene Substances 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 4
- 230000003712 anti-aging effect Effects 0.000 description 3
- 230000002929 anti-fatigue Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a technology for determining a maintenance special asphalt technical index system and preparing maintenance special asphalt, in particular to maintenance special asphalt and a preparation method thereof. The method comprises the steps of mixing, melting, shearing and stirring asphalt raw materials and a modifier to prepare maintenance asphalt; through the change of the penetration degree of the asphalt raw material and the modifier, the detection indexes of the final product after a short-term aging test are as follows: the temperature with the rut factor of 2.2 is not lower than 88 ℃; the detection indexes after the long-term aging test are as follows: the fatigue factor is not more than 5000. The invention can shorten the open traffic time, so that the maintenance asphalt can meet the requirements of long-term service performance such as aging resistance, fatigue resistance and the like while meeting the requirements of the load capacity at the initial stage of the maintenance of the pavement.
Description
Technical Field
The invention relates to a technology for determining a maintenance special asphalt technical index system and preparing maintenance special asphalt, in particular to maintenance special asphalt and a preparation method thereof.
Background
Asphalt is a thermoplastic material, has good fluidity at the temperature higher than 140 ℃, is in a semisolid state at normal temperature, and has certain brittleness at low temperature. Asphalt pavement is formed by mixing asphalt and aggregate at high temperature (generally higher than 170 ℃), paving at a certain temperature (generally not lower than 140 ℃), rolling, and cooling (the current standard requirement is lower than 50 ℃) by open traffic. Compared with a newly-built road surface, the time for opening the traffic after the maintenance project is finished affects the traffic efficiency and the economic benefit, and one of the key factors for affecting the road surface opening is the time required for cooling the road surface to bear traffic load.
Asphalt is an organic material, the initial pavement strength is not insufficient due to the fact that the traffic load does not reach the design load in the initial application period, the asphalt material is gradually hardened along with the increase of the application time of the asphalt pavement, the pavement strength is gradually increased, and the increase of the traffic load can be compensated along with the gradual increase of the traffic load. Compared with a newly-built pavement, when the maintenance engineering finishes opening traffic, the asphalt pavement instantly reaches the design load, and the initial strength of the pavement cannot bear the suddenly-increased traffic load, so that the maintenance engineering is easy to generate ruts for a long time, and the driving safety and the service life of the pavement are influenced.
The maintenance engineering can bear design load and shorten open traffic time at the initial commissioning stage, and can be realized by improving the bearing capacity at the initial commissioning stage and the bearing capacity at high temperature. However, the prior art has no complete record on how to establish a characterization index system meeting the above requirements and a preparation method of curing asphalt meeting the above requirements, and the record of curing asphalt products meeting the above requirements is lacked.
Disclosure of Invention
The invention aims to solve the technical problem of providing maintenance special asphalt capable of shortening open traffic time and a preparation method thereof, so that the maintenance special asphalt meets the requirements of long-term service performance such as ageing resistance, fatigue resistance and the like while meeting the requirement of load meeting the bearing capacity at the initial stage of maintenance pavement application.
The preparation method of the special maintenance asphalt comprises the following steps: preparing maintenance asphalt by mixing, melting, shearing and stirring asphalt raw materials and a modifier; through the needle penetration of the asphalt raw material and the change of the modifier, the detection indexes of the final product after a short-term aging test are as follows: the temperature with the rut factor of 2.2 is not lower than 88 ℃; the detection indexes after the long-term aging test are as follows: the fatigue factor is not more than 5000.
The maintenance asphalt comprises asphalt raw materials and a modifier, wherein the penetration degree of the asphalt raw materials is 10-300 (0.1 mm), the modifier is one or a combination of more of SBS, PE, waste tire rubber powder, polystyrene and polypropylene, the mass parts of the asphalt raw materials are 55-95, and the mass parts of the modifier are 5-45.
Preferably, the penetration degree of the asphalt raw material is 10-50 (0.1 mm), the modifier is SBS and PE, and the components in parts by weight are as follows: 80-95 parts of asphalt raw material, 3-7 parts of SBS and 5-10 parts of PE.
Preferably, the penetration degree of the asphalt raw material is 60-80 (0.1 mm), the modifier is waste tire rubber powder and polymer SBS, and the components in parts by weight are as follows: 55-87 parts of asphalt raw material, 10-35 parts of waste tire rubber powder and 3-10 parts of polymer SBS.
Preferably, the penetration degree of the asphalt raw material is 110-130 (0.1 mm), the modifier is waste tire rubber powder and SBR, and the modifier comprises the following components in parts by weight: 60-87 parts of asphalt raw material, 10-30 parts of waste tire rubber powder and 3-10 parts of SBR.
Preferably, the penetration degree of the asphalt raw material is 200-300 (0.1 mm), the modifier is waste tire rubber powder, polystyrene and polypropylene, and the modifier comprises the following components in parts by weight: 60-92 parts of asphalt raw material, 5-20 parts of waste tire rubber powder, 3-10 parts of polystyrene and 3-10 parts of polypropylene.
The advantages of the invention are embodied in that:
1. the method provides a method for determining the technical index of the special maintenance asphalt and an index system, wherein the technical index system represents the requirement of the traffic load of the maintenance engineering through the low limit of the rutting factor of the sample after the combined action of short-term aging and long-term aging, represents the upper limit of the open traffic temperature of the maintenance engineering through the rutting factor of the asphalt sample after the short-term aging, and ensures the anti-aging and anti-fatigue performance of the maintenance engineering through the low-temperature flexibility of the sample after the combined action of the short-term aging and the long-term aging.
2. The special maintenance asphalt provided by the invention has the advantages that the bearing capacity (represented by rut factors) is higher in temperature, or the rut factors are higher at the highest pavement design temperature, so that the maintenance engineering can open traffic at the pavement temperature higher than the standard and specified, and the maintenance time is saved.
3. The special maintenance asphalt has higher rutting factors at the initial maintenance engineering application stage, compensates the time difference of gradually reaching the design load from the small traffic volume with the newly-built expressway, and enables the initial maintenance engineering application stage to bear the design load.
4. The special maintenance asphalt and the preparation method thereof adopt the traditional technical indexes and the analysis and detection method, and ensure the anti-fatigue and anti-aging performance of the maintenance engineering.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will become apparent to those skilled in the art after reading the present invention, and fall within the scope of the appended claims.
Example 1
The asphalt with the penetration degree of 60-80 (0.1 mm) is used as a raw material, the waste tire rubber powder and the polymer SBS are used as modifiers, the mixture is stirred, mixed and sheared at the temperature of 2,170-180 ℃ in a ratio of 80, and the product number is P1.
Example 2
The asphalt with the penetration degree of 110-130 (0.1 mm) is used as a raw material, the waste tire rubber powder and the SBR are used as modifiers, the ratio is (70).
Example 3
The special maintenance asphalt is prepared by stirring, mixing and shearing asphalt raw materials with the penetration degree of 10-50 (0.1 mm) and SBS and PE as modifiers at the ratio of 93 to 4 at 170-180 ℃, and the product number is P3.
Example 4
The asphalt with the penetration degree of 200-300 (0.1 mm) is used as a raw material, the waste tire rubber powder, the polystyrene and the polypropylene are used as modifiers, the ratio is 73.
The above examples of the present invention were compared with conventional PG76-22 modified asphalt and tested.
The specific technical index system is determined as follows:
the PG76-22 asphalt material for newly-built asphalt pavement is taken as a reference, and the meaning is as follows: the temperature of the rutting factor after short-term aging (film oven or rotary film oven, TFOT or RTFOT) is 2.2 is not lower than 76 ℃, the fatigue factor after long-term aging (film oven + pressure aging tank test, TFOT + PAV) is less than 5000, the modulus S value of the bending rheometer (BBR) at-22 ℃ is less than 300, and the modulus change rate (m value) is less than 300.
According to the specification requirement of the asphalt pavement, the pavement temperature is lower than 50 ℃ and can open traffic, and the rutting factor (K50) of a sample at 50 ℃ after PG76-22 is aged for a short time is taken as the requirement of open traffic on strength. Therefore, after the special maintenance asphalt in the embodiment of the invention is aged for a short time, the equivalent temperature (KT) of the rutting factor and K50 is the temperature at which the special maintenance asphalt can open traffic. The difference value (delta t, h) between the time (t 50, h) when the asphalt pavement is cooled to 50 ℃ and the time (tT, h) when the asphalt pavement is cooled to the rut factor K50 is the time for opening the traffic in advance.
The asphalt after the short-term aging and the long-term aging (such as RTFOT + PAV) of the asphalt act together is equivalent to a pavement which is used for 8-10 years, and the rutting factor of the asphalt sample after PG76-22 is treated by the process is used as the rutting factor (Kb) which meets the requirement of the designed load bearing capacity.
The technical indexes provided by the invention obtained by detecting the special maintenance asphalt numbered as P1, P2, P3 and P4 and the reference PG76-22 modified asphalt are shown in Table 1.
TABLE 1
The rutting factor (K50) of the reference asphalt PG76-22 at the open traffic temperature (50 ℃) is 3.5Kpa, while the rutting factors of the maintenance special asphalt in the embodiment of the invention at 3.5Kpa are respectively 70.1 ℃, 72.5 ℃, 79.2 ℃ and 87.3 ℃, which are obviously higher than the open traffic temperature (50 ℃) of PG 76-22.
According to the embodiment of the invention, the higher temperature of the open traffic, the ratio of the time for cooling to the corresponding temperature to the time for cooling PG76-22 to 50 ℃ is reduced by 20.1 hours, 22.5 hours, 29.2 hours and 37.3 hours respectively, namely the time for opening the traffic is saved compared with PG 76-22. The rutting factor of the reference asphalt PG76-22 at 50 ℃ after long-term aging (TFOT + PAV) is 6.5Kpa, while the rutting factors at 50 ℃ under the open traffic temperature (50 ℃) of the special asphalt for maintenance of the embodiment of the invention are 8.9Kpa, 10.2Kpa, 12.5Kpa and 13.1Kpa respectively, which are all higher than the rutting factor of the reference asphalt PG76-22 at 50 ℃ under the open traffic temperature (6.5 Kpa), namely when the road surface temperature is reduced to 50 ℃, the bearing capacity of the maintenance engineering can meet the requirement of instantly achieving the designed traffic volume.
The sample of the special maintenance asphalt of the embodiment after being subjected to RTFOT + PAV has a fatigue factor less than 5000 at the corresponding highest pavement design temperature and lowest pavement design temperature, the BBR of the lowest pavement design temperature has an S value less than 300 and an m value not less than 0.3, and the anti-aging and anti-fatigue performance meets the requirements.
Claims (6)
1. A preparation method of special maintenance asphalt is characterized by comprising the following steps:
preparing maintenance asphalt by mixing, melting, shearing and stirring asphalt raw materials and a modifier; through the change of the penetration degree of the asphalt raw material and the modifier, the detection indexes of the final product after a short-term aging test are as follows: the temperature with the rut factor of 2.2 is not lower than 88 ℃; the detection indexes after the long-term aging test are as follows: the fatigue factor is not more than 5000.
2. A special maintenance asphalt is characterized in that:
the asphalt comprises asphalt raw materials and a modifier, wherein the penetration degree of the asphalt raw materials is 10-300 (0.1 mm), the modifier is one or a combination of more of SBS, PE, waste tire rubber powder, polystyrene and polypropylene, the asphalt raw materials are 55-95 parts by weight, and the modifier is 5-45 parts by weight.
3. The preferable maintenance-dedicated asphalt according to claim 2, wherein:
the penetration degree of the asphalt raw material is 10-50 (0.1 mm), the modifier is SBS and PE, and the mass parts of the components are as follows: 80-95 parts of asphalt raw material, 3-7 parts of SBS and 5-10 parts of PE.
4. The preferable maintenance-dedicated asphalt according to claim 2, wherein:
the penetration degree of the asphalt raw material is 60-80 (0.1 mm), the modifier is waste tire rubber powder and polymer SBS, and the modifier comprises the following components in parts by weight: 55-87 parts of asphalt raw material, 10-35 parts of waste tire rubber powder and 3-10 parts of polymer SBS.
5. The preferable maintenance-specific asphalt according to claim 2, wherein:
the penetration degree of the asphalt raw material is 110-130 (0.1 mm), the modifier is waste tire rubber powder and SBR, and the modifier comprises the following components in parts by weight: 60-87 parts of asphalt raw material, 10-30 parts of waste tire rubber powder and 3-10 parts of SBR.
6. The preferable maintenance-specific asphalt according to claim 2, wherein:
the penetration degree of the asphalt raw material is 200-300 (0.1 mm), the modifier is scrap tire rubber powder, polystyrene and polypropylene, and the modifier comprises the following components in parts by weight: 60-92 parts of asphalt raw material, 5-20 parts of waste tire rubber powder, 3-10 parts of polystyrene and 3-10 parts of polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310903.0A CN115521629A (en) | 2022-10-25 | 2022-10-25 | Maintenance special asphalt and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211310903.0A CN115521629A (en) | 2022-10-25 | 2022-10-25 | Maintenance special asphalt and preparation method thereof |
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| CN115521629A true CN115521629A (en) | 2022-12-27 |
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| CN202211310903.0A Pending CN115521629A (en) | 2022-10-25 | 2022-10-25 | Maintenance special asphalt and preparation method thereof |
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Application publication date: 20221227 |