CN115785682A - Preparation method of asphalt mixture - Google Patents
Preparation method of asphalt mixture Download PDFInfo
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- CN115785682A CN115785682A CN202211547091.1A CN202211547091A CN115785682A CN 115785682 A CN115785682 A CN 115785682A CN 202211547091 A CN202211547091 A CN 202211547091A CN 115785682 A CN115785682 A CN 115785682A
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Abstract
The application discloses preparation method of mixed asphalt material relates to bituminous mixture technical field, has solved among the prior art problem that bituminous paving is easy to split among the prior art, suffers the destruction easily, and the problem that the cost is high, and this method includes: adding not less than 20% of rubber powder into the matrix asphalt, and uniformly mixing; adding multiple modifiers for mixing; the practicability of the asphalt mixture is improved, and the performance of the asphalt mixture is improved on the premise of reducing the cost.
Description
Technical Field
The application relates to the technical field of asphalt mixtures, in particular to a preparation method of an asphalt mixture.
Background
With the rapid development of economy and the increasing demand of traffic infrastructure, the expressway is also used as an important project to be promoted and implemented. According to investigation, the high-grade pavement is mainly composed of asphalt pavement, and the proportion of the asphalt pavement is more than 90%. The use of the asphalt pavement is often influenced by the comprehensive effects of traffic load, atmospheric temperature, humidity and other factors, so that the use performance of the asphalt pavement is deteriorated, and the use performance of the pavement and the driving comfort and safety of drivers and passengers are guaranteed by assisting certain asphalt pavement maintenance technology during service.
At present, asphalt pavements in road construction are mainly formed by paving asphalt mixtures on a base layer and compacting the asphalt mixtures by a road roller machine. The asphalt type and the oil-stone ratio in the asphalt mixture can influence the crack resistance of the asphalt mixture, and an asphalt pavement can be exposed to the natural environment for a long time and is easy to damage in the using process.
Disclosure of Invention
The embodiment of the application provides a preparation method of the asphalt mixture, solves the problems that an asphalt pavement is easy to crack and easy to damage in the prior art, and is high in manufacturing cost, the practicability of the asphalt mixture is improved, and the performance of the asphalt mixture is improved on the premise of reducing the cost.
The embodiment of the invention provides a preparation method of a mixed asphalt material, which comprises the following steps:
adding not less than 20% of rubber powder into the matrix asphalt, and uniformly mixing;
then adding a plurality of modifiers for mixing.
In one possible implementation, the plurality of modifiers includes: mix 1.3%4303 modifier, 2%6302 modifier, 6%5# modifier, and 0.15%1# modifier.
In one possible implementation, the rubber powder comprises ground waste tires.
In one possible implementation, the asphalt-to-stone ratio of the base asphalt is 4.9%.
In a possible implementation manner, the adding not less than 20% of rubber powder into the base asphalt comprises the following steps: heating the base asphalt to a temperature between 175 ℃ and 185 ℃.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
according to the embodiment of the invention, by adopting the preparation method of the asphalt mixture, not less than 20% of rubber powder is added into the matrix asphalt and is uniformly mixed; then adding a plurality of modifiers for mixing; the rubber powder composite modified asphalt mixture adopts a special composite modification formula and process, ensures the balance of asphalt performance, gives consideration to the high-temperature and low-temperature performance of asphalt, highlights the toughness and elasticity of the asphalt, effectively solves the problem of high manufacturing cost, realizes excellent elastic recovery and low-temperature extensibility on the basis of low manufacturing cost, and has certain high-temperature performance, ageing resistance and good construction workability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating steps of a method for preparing a mixed asphalt material according to an embodiment of the present disclosure.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The most key material of the asphalt mixture pavement is asphalt in the asphalt mixture pavement, the scheme of introducing the asphalt mixture pavement from the beginning in China has a development process of nearly twenty years, and various modified asphalt is developed from the initial common asphalt to the later modified asphalt, but the asphalt is widely applied and is also the modified asphalt. According to the relevant data of the State statistics bureau: at present, the price value of the modified asphalt used in China is about 400 hundred million every year, so the modified asphalt in China is mainly modified and accounts for about 95 percent of the market. But neither product can leave the product development law: development period, growth period, maturity period and decline period. The modified asphalt has been used for over two decades, and some performance weaknesses of the modified asphalt begin to emerge, such as poor low temperature performance, extremely weak crack resistance and the like. Secondly, the modified asphalt also has the problem on the business mode: because the modified asphalt is widely applied in the whole country for many years, the production process and the technology are completely mastered by people in the industry, so that production enterprises of the modified asphalt exist all over the whole country at present, and the operation profit margin of the modified asphalt is extremely low at present, so that the competition of the modified asphalt can be only won by quantity at present, and many enterprises are seeking new substitute products at utmost.
The rubber powder is applied to asphalt pavements, has mature application experience after being developed in China, has obvious application value, and has great potential to replace modified asphalt in the China market.
The embodiment of the invention provides a preparation method of a mixed asphalt material, which comprises the following steps S101 to S102 as shown in FIG. 1.
S101, adding not less than 20% of rubber powder into the matrix asphalt, and uniformly mixing.
And S102, adding a plurality of modifiers for mixing.
According to the preparation method of the mixed asphalt material, the anti-reflection crack and anti-leather material capability of the mixed asphalt is 2 to 5 times that of common asphalt and modified asphalt, so that the material consumption and the cost of production can be reduced, and under the use premise of the same effect, the thickness of the mixed two-family thinning asphalt concrete layer prepared by the preparation method can be obviously reduced in bridge pavement, and the engineering cost is reduced.
A plurality of modifiers, comprising: mix 1.3%4303 modifier, 2%6302 modifier, 6%5# modifier, and 0.15%1# modifier. The rubber powder comprises ground waste tires. The asphalt-to-stone ratio of the base asphalt was 4.9%. Adding not less than 20% of rubber powder into the matrix asphalt, and uniformly mixing the components: the matrix asphalt is heated to a temperature between 175 ℃ and 185 ℃.
1. Matrix asphalt detection
Firstly, selecting proper matrix asphalt, selecting armored petrochemical 90#, and carrying out index detection as follows:
the index meets the requirement of matrix asphalt 90-A.
2. A group of rubber composite modified asphalt is prepared to meet the index of the modified asphalt
As can be seen from the above experimental data, the data for the formula 1.3%4303+2%6302+10% rubber powder +6%5# +0.15% meets the I-D index requirements for the modified asphalt. The dynamic viscosity at 60 ℃ is as follows: 13.44 × 359.2=4827.6pa.s
+1.3%4303 represents base asphalt plus 5% (mass fraction) 4303 modifier. 6302 modifier. Modifier # 1.
3. The rubber composite modified asphalt is used for better preventing rutting of a road surface, the dynamic viscosity at 60 ℃ of the asphalt is mainly considered, other indexes can be relieved, and all star-shaped modifiers are selected for better high-temperature performance. Firstly, common rubber powder is prepared to fix 15 percent of the mixing amount, and different modifier mixing amounts are prepared.
The test data can show that when the mixing amount of the common rubber powder is 15%, the mixing amount of the star-shaped modifier is 3.0% or more, the softening point is above 80 ℃, and the dynamic viscosity at 60 ℃ is above 2 ten thousand, so that the requirement of high-viscosity asphalt viscosity is met. The high-temperature stability of the mixture is satisfied.
(2) Because the common rubber powder has strong smell after being added, the rubber powder is not environment-friendly, and the common rubber powder is changed into modified rubber powder with 5 percent of light calcium carbonate added in the mussel port for testing.
From the above data, the modified rubber powder has a poor effect on increasing the viscosity, which is inferior to the ordinary rubber powder. But the conventional indexes, such as ductility indexes, are much better than the modification of the common rubber powder.
(3) On the premise of ensuring that the mixing amount of the modifier is 3 percent, adding different mixing amounts of common rubber powder for testing
The tests show that under the condition of same modifier, the content of rubber powder is increased, and its high-temperature performance is better, for example, the higher softening point is, the higher viscosity is, when the blending quantity of modifier is 3%, and when the blending quantity of rubber powder is 15%, the dynamic viscosity of 60 deg.C of composite modified asphalt can be above 2 ten thousand. When the mixing amount of the rubber powder is 20%, the dynamic viscosity of the composite modified asphalt at 60 ℃ is more than 4 ten thousand.
5 groups of Marshall test pieces (4 in each group) are respectively manufactured and molded by a Marshall electric compaction instrument, the compaction molding temperature of the test pieces is 185 ℃, and the compaction times of each test piece is 75 times. See table below.
Technical indexes of Marshall test piece
A Marshall test piece is prepared by adopting the optimal asphalt using amount of 4.9 percent (the asphalt-stone ratio), an AC-13 type rubber powder composite modified asphalt mixture water-soaking Marshall test is carried out according to a T0709-2011 method in JTG E20-2011 regulations, the test result shows that the residual stability of the Marshall test piece is 92.7 percent, the requirement that the Marshall residual stability is not less than 90 percent in the design and test indexes of the asphalt concrete mixing ratio is met, and the specific test result is shown in the following table.
Water stability test
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary hardware. Based on such understanding, the technical solutions of the present application may be embodied in the form of software products or in the implementation process of data migration, which essentially or partially contributes to the prior art. The computer software product may be stored in a storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, mobile terminal, server, or network device, etc.) to perform the methods described in the various embodiments or portions of the embodiments of the present application.
A rutting test piece is prepared by adopting the optimal asphalt using amount of 4.9 percent (the oil-stone ratio), an AC-13 type rubber powder composite modified asphalt mixture rutting test is carried out according to the T0719-2011 specification in the JTG E20-2011 specification, the test result is shown in the following table, the dynamic stability DS =6484 times/mm, and the requirement that the dynamic stability of the rutting test in the design test index of the asphalt mixture mixing ratio is not less than 5000 times/mm is met. See table below.
High temperature stability test
The waste tire rubber powder is added into the asphalt, so that the asphalt has higher elasticity and elastic recovery performance, the consistency of the asphalt cement is improved, and the anti-rutting performance of the asphalt mixture is improved. The temperature sensitivity of the asphalt pavement is reduced, the fatigue cracking resistance is improved under the condition that the low-temperature performance is not reduced, and the durability of the pavement is improved. The viscosity is high, the oil film of the mixture is thick, so that the leakage or oil bleeding is not easy to occur, and the anti-aging performance of the pavement is improved.
The waste tire as solid waste has caused serious social and environmental problems, and the traditional treatment mode is as follows: stacking, landfill and incineration pollute the environment, occupy land resources, breed mosquitoes and spread diseases. The production of rubber powder is the only environmental protection scheme which can treat the waste tire continuously. The rubber powder composite modified asphalt pavement material can be recycled, and secondary pollution can not be caused.
After the construction of the test section is completed, the pavement performance of the rubber powder composite modified asphalt pavement is detected, and the pavement performance is evaluated mainly from the aspects of high-temperature stability, water stability, skid resistance and the like.
1. Stability to water
The water damage is a common disease of the asphalt pavement, under the action of a driving load, water entering gaps of the pavement continuously generates the repeated action of hydrodynamic pressure or vacuum negative pressure suction, water gradually permeates into an interface between asphalt and aggregate, so that the adhesion of the asphalt is reduced and the adhesion is gradually lost, an asphalt film falls off (peels) from the surface of stone, an asphalt mixture falls off and loosens, and then pit grooves, extrusion deformation and other damage phenomena of the asphalt pavement are formed. The experimental detection shows that the residual stability of the rubber powder composite modified asphalt mixture is 95.4 percent, and the requirement of the anti-stripping capability of the pavement when being damaged by water is met.
(1) Stability test
Stability test results
(2) Residual stability test
Residual stability test results
(3) Water penetration test
Water seepage test detection result
| Detecting items | Unit of | Technical requirements | Measured value |
| Coefficient of water permeability | mL/min | ≤100 | 19.3 |
The balance of the asphalt performance is ensured, the high-temperature performance and the low-temperature performance of the asphalt are considered, and the toughness and the elasticity of the asphalt are highlighted. Comprehensive test tests prove that the modified asphalt is novel special modified asphalt, has excellent elastic recovery and low-temperature extensibility, and has certain high-temperature performance, ageing resistance and good construction workability. Research and practice show that compared with common asphalt pavement, the asphalt pavement has the advantages of rutting resistance, crack resistance, skid resistance, water stability, durability and the like, and the service performance is comprehensively improved and improved, so that the asphalt pavement is rapidly developed and widely popularized and applied to the engineering fields of highways, urban roads, airport runways and the like. The rubber powder composite modified asphalt mixture AC type adopts a suspension-dense structure, has larger consistency and good cohesiveness; the material has high plasticity, and can deform without cracking under the action of certain temperature and external force; the product has enough temperature stability, is not soft in summer and is not brittle in winter; the heat and light aging resistance is strong; has strong water damage resistance. The internal void ratio of the mixture is very small (about 4%), the mixture hardly seeps water, the water in the mixture is in a capillary water form and is not suitable to be large power water, and in addition, the binding power of the mastic and the aggregate is good, so that the water stability of the mixture is greatly improved. From the viewpoint of the mixture mixing requirement and construction equipment, the construction difficulty of the rubber powder composite modified asphalt mixture is not great. Although problems may occur during the laying of test roads, which are not regarded as a growing cost, it has been proven that, by virtue of local construction forces, they can be properly solved in a very short time by appropriate technical measures.
The mixing requirement of the rubber powder composite modified asphalt mixture is basically consistent with that of common modified asphalt, and no segregation phenomenon is found in the production process. The paving temperature of the mixture is kept above 160 ℃, and the construction workability is good. No temperature segregation occurs.
The rubber powder composite modified asphalt mixture test road uses common construction mechanical equipment commonly used by construction units. For example, the high-permeability high-viscosity non-stick wheel adhesive layer oil adopts a common asphalt spreading vehicle, the asphalt spreading adopts a common asphalt spreader, no special mechanical configuration is added, and no additional operation technical training is required for an operator. Therefore, the construction quality of the rubber powder composite modified asphalt mixture is controllable, and the method is suitable for popularization and promotion.
After the construction of the test section is completed, the pavement performance of the rubber powder composite modified asphalt pavement is detected, and the pavement performance is evaluated mainly from the aspects of high-temperature stability, water stability, skid resistance and the like.
1. Stability to water
The water damage is a common disease of the asphalt pavement, under the action of a driving load, water entering gaps of the pavement continuously generates the repeated action of hydrodynamic pressure or vacuum negative pressure suction, water gradually permeates into an interface between asphalt and aggregate, so that the adhesion of the asphalt is reduced and the adhesion is gradually lost, an asphalt film falls off (peels) from the surface of stone, an asphalt mixture falls off and loosens, and then pit grooves, extrusion deformation and other damage phenomena of the asphalt pavement are formed. The experimental detection shows that the residual stability of the rubber powder composite modified asphalt mixture is 95.4 percent, and the requirement of the anti-stripping capability of the pavement when being damaged by water is met.
(1) Stability test
Stability test results
(2) Residual stability test
Residual stability test results
(3) Water penetration test
Water seepage test detection result
| Detecting items | Unit of | Technical requirements | Measured value |
| Coefficient of water permeability | mL/min | ≤100 | 19.3 |
2. High temperature stability
The rubber powder composite modified asphalt mixture is a road material consisting of typical viscoelastic material modified asphalt cementing mineral aggregate and filler, can generate flow deformation under the action of high temperature and load, track is formed by continuous accumulation of the flow deformation, and the asphalt mixture has good high-temperature track resistance so as to meet the actual road performance requirement. Through detection, the average value of the dynamic stability of the rubber powder composite modified asphalt mixture (AC-13 type) is 7202 times/mm, the requirement is met, and the pavement performance can meet the permanent deformation resistance of the asphalt pavement under the load action under the high-temperature condition.
Dynamic stability detection result
3. Anti-skid capability
Asphalt pavement should have sufficient skid resistance to ensure that vehicles can safely travel at high speeds under the most adverse conditions (such as wet pavement, etc.), and that the skid resistance does not decrease rapidly under the action of external factors. The friction coefficient and the surface structure depth are important indexes of the road surface roughness, and the detection shows that the road surface roughness meets the design requirements and meets the requirements of road performance on anti-skid capability.
(1) Depth of surface texture
| Detecting items | Unit of | Measured value |
| Depth of surface texture | mm | 0.63 |
(2) Coefficient of friction
| Detecting items | Unit of | Measured value |
| Coefficient of friction | BPN | 65 |
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on the difference from the other embodiments. All or portions of the present application are operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, mobile communication terminals, multiprocessor systems, microprocessor-based systems, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.
Claims (5)
1. The preparation method of the mixed asphalt material is characterized by comprising the following steps:
adding not less than 20% of rubber powder into the matrix asphalt, and uniformly mixing;
then adding a plurality of modifiers for mixing.
2. The method of claim 1, wherein the plurality of modifiers comprises: mix 1.3%4303 modifier, 2%6302 modifier, 6%5# modifier, and 0.15%1# modifier.
3. The method according to claim 1, characterized in that the rubber powder comprises ground waste tyres.
4. The method of claim 1, wherein the asphalt base asphalt has an oilstone ratio of 4.9%.
5. The method as claimed in claim 1, wherein the adding not less than 20% of rubber powder into the base asphalt comprises the following steps: heating the base asphalt to a temperature between 175 ℃ and 185 ℃.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105176115A (en) * | 2015-10-14 | 2015-12-23 | 辽宁省交通科学研究院 | SBS-rubber powder composite modified asphalt and preparation method thereof |
| CN108101420A (en) * | 2017-12-30 | 2018-06-01 | 中铁十八局集团第五工程有限公司 | Rubber powder modified asphalt mixture and preparation method thereof |
| CN108219487A (en) * | 2017-12-30 | 2018-06-29 | 中铁十八局集团第五工程有限公司 | A kind of rubber powder modified asphalt and preparation method thereof |
| CN112409802A (en) * | 2020-10-29 | 2021-02-26 | 江西省高速公路投资集团材料有限公司 | High-performance waste tire rubber powder modified asphalt and preparation method thereof |
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- 2022-12-05 CN CN202211547091.1A patent/CN115785682A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105176115A (en) * | 2015-10-14 | 2015-12-23 | 辽宁省交通科学研究院 | SBS-rubber powder composite modified asphalt and preparation method thereof |
| CN108101420A (en) * | 2017-12-30 | 2018-06-01 | 中铁十八局集团第五工程有限公司 | Rubber powder modified asphalt mixture and preparation method thereof |
| CN108219487A (en) * | 2017-12-30 | 2018-06-29 | 中铁十八局集团第五工程有限公司 | A kind of rubber powder modified asphalt and preparation method thereof |
| CN112409802A (en) * | 2020-10-29 | 2021-02-26 | 江西省高速公路投资集团材料有限公司 | High-performance waste tire rubber powder modified asphalt and preparation method thereof |
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