CN113621243A - DOA-SBS binary composite high-modulus modified asphalt and preparation method thereof - Google Patents
DOA-SBS binary composite high-modulus modified asphalt and preparation method thereof Download PDFInfo
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract
The invention discloses DOA-SBS binary composite high modulus modified asphalt and a preparation method thereof, and in an implementation mode, the modified asphalt comprises the following raw materials: no. 70 asphalt, deoiled asphalt, SBS modifier and stabilizer. The DOA-SBS binary composite high-modulus modified asphalt provided by the application meets the requirements of high-modulus modified asphalt in high-modulus asphalt mixture construction and technical specification (DB 21/T1754-; compared with the addition of high modulus additives, the low-modulus additive has low cost and can effectively reduce the variability of the mixture.
Description
Technical Field
The invention relates to the technical field of asphalt preparation, in particular to DOA-SBS binary composite high-modulus modified asphalt with high and low temperature performance and low cost and a preparation method thereof.
Background
With the rapid development of national economy and road transportation industry, the rapid change of traffic conditions, the rapid increase of traffic volume and the large-scale vehicle, the traffic characteristics can be summarized as 'large traffic volume' and 'large-scale vehicle overweight', and the vehicle overweight causes 'heavy axle load' and tire-road surface 'heavy contact stress', under these circumstances, the road surface is inevitably in a "heavy load" state (or "heavy load" state), which is especially serious in big cities like Beijing, and the adverse factors of continuous high temperature in summer, cold in winter and the like make the asphalt road surface face a severe test, and various types of damages such as rutting, hugging, fatigue cracking and the like occur on many asphalt road surfaces after a vehicle is started, the service performance of the road pavement rapid deterioration road pavement comfort and safety are seriously affected, and the service life and service level of the road pavement are shortened.
Under the circumstances, how to improve the mechanical property of the pavement material, improve the high-temperature deformation resistance and fatigue resistance of the surface layer material, and give consideration to the low-temperature property of the pavement material, so that the pavement material meets the requirement of heavy traffic becomes a problem which is very concerned by the technical personnel of the road engineering at present. To solve these problems, researchers at home and abroad have adopted various approaches including development of new road materials, adjustment of new road structural forms, and the like. In various novel pavement materials developed by domestic and foreign engineers, high-modulus asphalt concrete is mainly used, and the design idea is to reduce the strain of the asphalt mixture under the action of vehicle load by improving the modulus of the asphalt mixture and improve the high-temperature deformation resistance of the pavement.
At present, two methods are commonly adopted for improving the modulus of the asphalt mixture, one method is to adopt low-grade hard asphalt to prepare the asphalt mixture, and the other method is to add high-modulus additives in the process of blending the asphalt mixture. The main problems of the low-grade hard asphalt mixture are that the low-temperature performance is poor, the hard asphalt mixture is easy to crack, the low-grade hard asphalt mixture is mainly used for a base layer and a lower layer, and the application level is low, so that the application of the hard asphalt in road engineering is severely restricted; and high-modulus additives are added in the process of mixing the asphalt mixture, so that the price of the high-modulus additives is higher, and the problems of large variability of the performance of the mixture and difficult quality control exist in a direct-adding mode.
Disclosure of Invention
The invention provides DOA-SBS binary composite high-modulus modified asphalt and a preparation method thereof. The high-modulus modified asphalt has the advantages of high and low temperature performance, low cost and capability of effectively reducing the variability of the mixture.
In order to achieve the above purpose, the invention provides a preparation method of DOA-SBS binary composite high modulus modified asphalt, which comprises the following steps:
step 1: preparing blended asphalt, namely heating the No. 70 asphalt to 175-200 ℃, adding deoiled asphalt while stirring, and stirring until the deoiled asphalt and the No. 70 asphalt are completely melted to obtain the blended asphalt;
step 2: shearing and dispersing, namely heating the blended asphalt to 165-175 ℃, then gradually adding the SBS modifier, and shearing for 0.8-1.3 hours at the shearing rate of 4500-5800 rpm;
and step 3: stirring and developing, replacing a stirring device, adding the stabilizer while stirring, and stirring and developing for 1.8-2.5 hours at the temperature of 165-175 ℃ to obtain the DOA-SBS binary composite high-modulus modified asphalt.
The preparation method of the DOA-SBS binary composite high-modulus modified asphalt preferably comprises the steps of heating No. 70 matrix asphalt to 190 ℃, adding deoiled asphalt while stirring, and stirring until the deoiled asphalt and the asphalt are completely melted to obtain the blended asphalt.
According to the preparation method of the DOA-SBS binary composite high-modulus modified asphalt, the blended asphalt is preferably heated to 170 ℃, then the SBS modifier is gradually added, and shearing is carried out for 1 hour, wherein the shearing rate of shearing is 5000 rpm.
Preferably, the stirring device is replaced, the stabilizer is added while stirring, and the DOA-SBS binary composite high-modulus modified asphalt is obtained after stirring and development for 2 hours at the temperature of 170 ℃.
The DOA-SBS binary composite high-modulus modified asphalt and the preparation method thereof can be realized through the invention, and in an implementation mode, the modified asphalt comprises the following raw materials in parts by weight:
the preparation method of the DOA-SBS binary composite high-modulus modified asphalt preferably comprises the following raw materials in parts by weight:
the preparation method of the DOA-SBS binary composite high-modulus modified asphalt preferably comprises the following raw materials in parts by weight:
the preparation method of the DOA-SBS binary composite high-modulus modified asphalt preferably comprises the following raw materials in parts by weight:
according to the preparation method of the DOA-SBS binary composite high-modulus modified asphalt, the No. 70 asphalt is preferably Mabo (6:4) No. 70 asphalt.
According to the preparation method of the DOA-SBS binary composite high-modulus modified asphalt, the deoiled asphalt is preferably Changqing deoiled asphalt or North China deoiled asphalt.
The invention also provides DOA-SBS binary composite high modulus modified asphalt obtained by the preparation method.
The DOA-SBS binary composite high-modulus modified asphalt obtained by the invention meets the requirements of high-modulus modified asphalt in high-modulus asphalt mixture construction and technical specification (DB 21/T1754-; compared with the prior art in which high modulus additives are added, the invention does not need to add high modulus additives such as thermoplastic resin and the like, has lower cost, can give consideration to high and low temperature performances, and can effectively reduce the variability of the mixture. In addition, compared with the prior art, the rubber powder and other raw materials used in the invention have low content, thereby further saving the production raw materials and reducing the production cost.
Drawings
FIG. 1 is a diagram of a softening point index trend provided in an embodiment of the present invention;
FIG. 2 is a chart of a needle penetration ratio indicator trend provided in an embodiment of the present invention;
FIG. 3 is an original rutting factor index trend chart provided in an embodiment of the present invention;
FIG. 4 is a graph illustrating rut factor indicator trends after aging provided in an embodiment of the present invention;
FIG. 5 is a graph of the 25 ℃ fatigue factor index trend provided in an embodiment of the present invention;
FIG. 6 is a trend graph of an m-value index provided in an embodiment of the present invention;
fig. 7 is an S-value index trend chart provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.
The deoiled asphalt (DOA) is a byproduct in the residual oil solvent deasphalting process, but the deoiled asphalt is less in utilization, most of the deoiled asphalt is used as fuel oil, and a small part of the deoiled asphalt is used for other purposes, such as being used as a raw material of a carbon material, producing road asphalt and the like, so that the utilization value is lower. Therefore, research efforts to develop a utilization pathway of deoiled asphalt and to increase its utilization value have been ongoing. The main components of the deoiled asphalt are colloid, asphaltene and a small amount of oil, and the deoiled asphalt is characterized by large modulus, high softening point, low penetration degree and great benefit for improving the modulus of the asphalt; and both DOA and asphalt are derived from petroleum, and the compatibility of the DOA and the asphalt is good. The high modulus modified asphalt is prepared by carrying out composite modification on asphalt with other modifiers, so that a choice is provided for a raw material source for preparing the high modulus additive of the high modulus modified asphalt, and a new way is found for efficient utilization of DOA.
The SBS modifier belongs to a styrene-butadiene-styrene triblock copolymer, a polystyrene chain segment and a polybutadiene chain segment in SBS obviously present a two-phase structure, polybutylene is a continuous phase, polystyrene is a disperse phase, so that polystyrene has 2 glass transition temperatures, the first glass transition temperature (Tg1) is-88 to-83 ℃, the second glass transition temperature (Tg2) is 90 ℃, and terminal polystyrene is gathered together between Tg1 and Tg2 to form micro-domains dispersed among the polybutadiene continuous phases, thereby playing the roles of physical crosslinking, chain segment fixing, vulcanization enhancement and cold flow prevention, having the high elasticity and fatigue resistance of vulcanized rubber, and when the temperature is raised to Tg2, the polystyrene phase is softened and flows to enable SBS to have resin flow processability. The two-phase separation structure can form a spatial three-dimensional network structure with the asphalt matrix, so that the temperature performance, the tensile property, the elasticity, the cohesion adhesion performance, the stability of the mixture, the aging resistance and the like of the asphalt are effectively improved. Among a plurality of asphalt modifiers, SBS can simultaneously improve the high-low temperature performance and the temperature sensing performance of asphalt, so that the asphalt becomes the most researched and applied variety, and SBS modified asphalt accounts for more than 61% of the global asphalt demand at present.
The embodiment of the application can provide DOA-SBS binary composite high-modulus modified asphalt which comprises the following raw materials in parts by weight:
further, the feed comprises the following raw materials in parts by weight:
further, the feed comprises the following raw materials in parts by weight:
further, the feed comprises the following raw materials in parts by weight:
the embodiment of the application also provides a preparation method of the DOA-SBS binary composite high-modulus modified asphalt, which comprises the following steps:
preparing blended asphalt, namely heating No. 70 matrix asphalt to 175-200 ℃, adding deoiled asphalt while stirring, and stirring until the deoiled asphalt and the asphalt are completely melted to obtain the blended asphalt; the heating temperature is 175-200 ℃ because the higher softening point of DOA requires higher temperature to melt. Further, heating No. 70 matrix asphalt to 190 ℃, adding deoiled asphalt while stirring, and stirring until the deoiled asphalt and the asphalt are completely melted to obtain the blended asphalt.
Shearing and dispersing, namely heating the blended asphalt to 165-175 ℃, then gradually adding the SBS modifier, and shearing for 0.8-1.3 hours at the shearing rate of 4500-5800 rpm; orthogonal tests show that when the shearing time is 1h, the high-modulus modified asphalt has comprehensive excellent performances; the high-modulus modified asphalt prepared at the shearing temperature of 170 ℃ has better low-temperature performance and fatigue performance. Further, the blended asphalt is heated to 170 ℃, and then SBS modifier is gradually added, and the shearing is carried out for 1 hour.
Stirring and developing, replacing a stirring device, adding the stabilizer while stirring, and stirring and developing at the temperature of 165-175 ℃ for 1.8-2.5 hours to obtain the high-modulus modified asphalt. Through an orthogonal test, when the development time is 2 hours, the high-modulus modified asphalt has comprehensive excellent performances; the high-modulus modified asphalt prepared at the development temperature of 170 ℃ has better low-temperature performance and fatigue performance. And further, replacing a stirring device, adding the stabilizer while stirring, and stirring and developing for 2 hours at the temperature of 170 ℃ to obtain the DOA-SBS binary composite high-modulus modified asphalt.
The scheme provided by the application is described in detail by the specific embodiment. The raw materials used in the following examples are all commercially available materials, and the source of the principle is not particularly limited.
Examples
The embodiment of the invention provides a preparation method of DOA-SBS binary composite high-modulus modified asphalt.
The high modulus modified asphalt comprises the following formula:
| marbo (6:4) No. 70 matrix asphalt | DOA of Changqing or DOA of North China | SBS | Stabilizer |
| 90(kg) | 10(kg) | 3.6(kg) | 0.1(kg) |
The preparation process of the high modulus modified asphalt comprises the following steps:
1) preparing blended asphalt: heating No. 70 matrix asphalt to 190 ℃, adding DOA while stirring, and stirring until the DOA and the asphalt are completely molten;
2) shearing and dispersing: heating the heated blended asphalt to 170 ℃, then gradually adding the SBS modifier, and shearing for 1 hour, wherein the shearing rate of the shearing is 5000 rpm;
3) stirring and developing: the stirring device is replaced, the stabilizer is added while stirring, and the mixture is stirred and developed for 2 hours at the temperature of 170 ℃.
The prepared DOA-SBS binary composite high-modulus modified asphalt has the following properties:
the properties of the selected raw materials are verified.
Determination of the base asphalt:
the embodiment of the application mainly selects three asphalts of Marble (4:6)70#, Marble (6:4)70# and Marble (6:4)50# of Qinhuang island asphalt plant, and the basic properties of the asphalts are shown in tables 1-1 and 1-2. The performance tests of the three asphalts are shown in tables 1-1, tables 1-2 and tables 1-3, respectively. Tables 1-1 and tables 1-2 show that the two 70# asphalts have small difference in properties, and the dynamic viscosity degrees at 60 ℃ of the two asphalts are 327 pas and 323 pas respectively, which are higher than the dynamic viscosity degrees at 60 ℃ of the 70# asphalt commonly used in the market, and thus the high-temperature stability of the asphalt is better. As can be seen from tables 1-2, the penetration index PI of the three base asphalts is not less than 0.4, which indicates that the temperature sensing performance of the three asphalts is good.
In addition, tables 1-3 show that the PG high temperature grades of the three asphalt of the Meado (4:6)70#, the Meado (6:4)70#, and the Meado (6:4)50# are 64 ℃, 70 ℃ and 70 ℃. To sum up, the embodiment of the application selects the gamma wave (6:4)70#, so that the requirement of high modulus and high temperature performance can be met, and DOA can be utilized to a greater extent.
TABLE 1-1 results of asphalt test using Megaku (6:4)70# and Megaku (4:6)70 #)
TABLE 1-2 Membo (6:4)50# asphalt test results
Tables 1-3 rut factor test results for three asphalts
Determination of deoiled asphalt (DOA):
chongqing DOA and North China DOA were selected, and their basic properties are shown in tables 1-4. Tables 1-4 show the results of two DOA performance tests. Tables 1-4 show that the two DOA's have high softening point and low penetration and are relatively suitable as modifiers for high modulus modified asphalt.
Tables 1-4 two DOA Performance test results
Determination of the modifier:
polymer Modified Asphalt (PMA) is formed by dispersing polymer in base asphalt, and the properties mainly depend on the chemical composition of asphalt, the monomer structure of polymer, molecular weight, phase transition temperature, solubility parameter, and compatibility of polymer and asphalt, so the key technology of polymer modified asphalt lies in the selection of asphalt and polymer types. Although the polymer modifier has various types and different performances, the overall requirements of the asphalt pavement are basically consistent according to the climate environment and traffic conditions in which the modified asphalt is used (namely, the high-temperature anti-rutting performance, the low-temperature anti-cracking performance and the fatigue resistance of the asphalt pavement are improved). The polymers added should therefore have a certain mechanical strength and a better temperature adaptability. Polymeric modifiers for asphalt can be classified into three broad categories, namely: (1) the modifier is Styrene Butadiene Rubber (SBR) which is mostly applied to modified asphalt; (2) resins, including thermoplastic resins and thermosetting resins, the former being represented by ethylene-vinyl acetate copolymer EVA, low density polyethylene LDPE, random polypropylene APP in modified asphalt, and the latter being mainly epoxy resin EP; (3) thermoplastic rubbers, most typically styrene-butadiene copolymer SBS. The thermoplastic rubber is the preferred modifier of the modified asphalt, most of which represents that SBS has better compatibility with the asphalt, forms a very fine dispersion system, has good storage stability, simultaneously has better high-temperature anti-rutting performance and low-temperature anti-cracking performance, and has better elasticity in a wider temperature range. The rubber modifier mainly improves the low-temperature performance of the asphalt and has little improvement on the high-temperature performance of the asphalt; the resin modifier is opposite, and has no obvious improvement on the low-temperature performance of the asphalt, and mainly improves the high-temperature performance of the asphalt because the resin modifier cannot obviously improve the elastic deformability of the asphalt. Based on the analysis, the SBS modifier is adopted in the embodiment of the application, the elasticity of the SBS modifier provided by the application is rapidly reduced along with the rise of the temperature at high temperature, so that the modified asphalt has good processability, and the large-scale popularization and application are realized.
Determining the dosage of deoiled asphalt:
the weight ratio of No. 70 asphalt to deoiled asphalt provided by the embodiment of the application is 85-90: 7-10, the penetration of the obtained blended asphalt can be controlled within 35-45 under the weight ratio, and the high-temperature performance of the product is considered at the same time. Tables 1-5 show that the penetration of the blended asphalt gradually decreases and the softening point gradually increases with increasing the proportion of DOA, which indicates that the addition of DOA significantly increases the hardness of the asphalt and improves the high temperature properties of the asphalt: when the DOA proportion is more than 10%, the increasing trend of the softening point becomes slow; in addition, the penetration requirement of a target product is 20-50, generally, after matrix asphalt is modified by adding a polymer, the penetration is reduced, the penetration after blending is designed to be controlled within 35-45 by combining the characteristics of Meadox asphalt and the experience of preparing modified asphalt, and the high-temperature performance of the product is considered, so that the most appropriate composition ratio of Meadox (6:4)70# and Changqing DOA is determined in the embodiment of the application to prepare blended asphalt and prepare high-modulus modified asphalt.
Table 1-5 test results of blended asphalt with different ratio compositions
| Mabo (6:4)70# Changqing DOA | Penetration/dmm at 25 ℃ | Softening point/. degree.C |
| 100：0 | 66 | 48.0 |
| 95：5 | 45 | 50 |
| 90：10 | 39 | 53 |
| 85：15 | 33 | 54.5 |
| 80：20 | 29 | 56 |
Determination of the amount of SBS modifier:
tables 1-6 show the formulation composition of high modulus modified asphalt with different dosage of SBS modifier, and tables 1-7 show the conventional performance index of high modulus modified asphalt without dosage of SBS modifier.
TABLE 1-6 formulation composition of high modulus modified asphalt with different amounts of SBS modifier
TABLE 1-7 conventional performance index of high modulus modified asphalt without SBS modifier dosage
Tables 1-7 show that when the dosage of the SBS modifier is 2.8% -4.0%, the softening point of the high-modulus modified asphalt tends to increase along with the increase of the dosage of the SBS modifier, which indicates that the increase of the dosage of the modifier is beneficial to improving the high-temperature performance of the high-modulus modified asphalt; the viscosity at 135 ℃ is increased overall, and the penetration at 25 ℃ is reduced first and then slightly increased, and is within the range of 29-36. In addition, under different SBS dosage, the penetration ratio of the high modulus modified asphalt after the film drying oven fluctuates between 89% and 97%, and the high modulus modified asphalt has no obvious change, but has a larger improvement compared with the conventional I-C and I-D modified asphalt, which shows that the high modulus modified asphalt has better ageing resistance. The preferred amount of SBS modifier used herein is therefore 3.6%.
The determination of the process conditions provided by the embodiment of the application:
the preparation process conditions of the high-modulus modified asphalt are particularly important to the performance of the high-modulus modified asphalt, so that the optimization of the preparation process conditions of the modified asphalt is very necessary. On the basis of the formula investigation, the preparation of the high-modulus modified asphalt is carried out, the penetration degree, the softening point, the penetration ratio of a film oven test, the rutting factor, the fatigue factor, the bending stiffness modulus S value and the creep change curve slope m of the high-modulus modified asphalt are used as balance indexes, the shearing and development temperature, the shearing rate, the shearing time and the development time are investigated, an orthogonal test method is adopted, three horizontal tests are carried out, and the optimal process condition is finally determined.
According to the previous results, the high modulus modified asphalt mixture ratio composition is determined and is shown in tables 1-8. The orthogonal test design and test results are shown in tables 1-9 and tables 1-10, respectively. The results of the cross tests were analyzed by taking the softening point as an example, and the sum of the softening points at the same level was first calculated, expressed as K1, K2 and K3, and the average value and the range R were calculated, as shown in tables 1-11.
The test factors are then plotted against the trend of the softening point, see FIG. 1. The extreme difference analysis trend graphs of other indexes in the orthogonal test are respectively shown in figures 2 to 7. In the test investigation range, the major and minor sequences of the influence factors of each index of the high-modulus modified asphalt and the optimal level combination thereof are listed in tables 1-12. The shear and development temperature, shear rate, shear time and development time are represented by A, B, C and D, respectively, and the three levels from low to high are represented by 1, 2 and 3, respectively, as for temperature, A1, A2 and A3 represent 170 deg.C, 180 deg.C and 190 deg.C, respectively.
TABLE 1-8 high modulus modified asphalt mixture ratio composition
| Marbo (6:4) No. 70 matrix asphalt | DOA of Changqing or DOA of North China | SBS | Stabilizer |
| 90(kg) | 10(kg) | 3.6(kg) | 0.1(kg) |
TABLE 1-9 Quadrature test for high modulus modified asphalt preparation process
| Numbering | Shear and development temperature/. degree.C | Shear rate/rpm | Shear time/min | Development time/ |
| 1 | 170 | 3000 | 20 | 2 |
| 2 | 170 | 4000 | 40 | 4 |
| 3 | 170 | 5000 | 60 | 6 |
| 4 | 180 | 3000 | 40 | 6 |
| 5 | 180 | 4000 | 60 | 2 |
| 6 | 180 | 5000 | 20 | 4 |
| 7 | 190 | 3000 | 60 | 4 |
| 8 | 190 | 4000 | 20 | 6 |
| 9 | 190 | 5000 | 40 | 2 |
TABLE 1-10 high modulus modified asphalt Performance test results
TABLE 1-11 Quadrature test range analysis (softening point)
| Factors of the fact | Shear and development temperature/. degree.C | Shear rate/rpm | Shear time/min | Development time/h |
| K1 | 205.5 | 216.5 | 219 | 211.5 |
| K2 | 221 | 219 | 225.5 | 226.5 |
| K3 | 237 | 228 | 219 | 225.5 |
| K1/3 | 68.5 | 72.2 | 73 | 70.5 |
| K2/3 | 73.7 | 73 | 75.2 | 75.5 |
| K3/3 | 79 | 76 | 73 | 75.2 |
| R | 10.5 | 3.0 | 2.2 | 5.0 |
As can be seen from tables 1-12, the optimal conditions of the individual analysis of the 7 indexes are not consistent, and the optimal process conditions must be determined by comprehensively balancing the primary and secondary sequences of the influence of the factors on the five indexes.
For factor A, A3 is preferable for the softening point and penetration ratio, A2 is preferable for the rutting factor and fatigue factor as they are, A1 is preferable for the rutting factor after aging and the m and S values of BBR test, and A1, A2 and A3 are preferable. A is the first factor of softening point, rutting factor after aging, m value, is the second factor of penetration ratio and S value, is the fourth factor of fatigue factor and rutting factor, and for rutting factor and fatigue factor, the difference between A1, A2 and A3 is not large, the maximum difference percentage is 0.1% and 0.65%, respectively, so the balance is made between A1 and A3. A1 has both high-temperature performance (rutting factor after aging) and low-temperature performance (m and S values of BBR test) of high-modulus modified asphalt, while for A3, the softening point of A3 is 10.5 ℃ higher than that of A1, the penetration of A3 is 8.8% higher than that of A1, and in addition, the softening point and the rutting factor can both represent the high-temperature performance of the high-modulus modified asphalt, so the A1 and the A3 are difficult to balance.
TABLE 1-12 Primary and secondary sequences of various index influencing factors of modified asphalt and optimal level combination thereof
For the factor B, the factor B is not a main factor for each index, except for m and S values of low-temperature performance, the other indexes are B3, the m and S values are B1, and the factor B3 is selected in consideration of the fact that high-temperature performance is emphasized more in high-modulus modified asphalt. For the factor C, the softening point and the fatigue factor are preferably C2, and other indexes are preferably C3; the factor C is a first influence factor of the rutting factor, is a second influence factor of the fatigue factor, has smaller influence on the softening point and is arranged in the fourth position; further, since the increase in fatigue factor of C3 is only 3.2% as compared with that of C2, C3 is preferred. For factor D, the softening point is D2, the rut factor after aging is D3, and the other indexes are D1. The factor D is a first influence factor of the fatigue factor and the penetration ratio, is a second influence factor of the softening point and the aged rutting factor, is a third influence factor of the rutting factor and the S value, and is a fourth influence factor of the m value; if D2 is used, the fatigue factor is greater than 5000kPa, which is not satisfactory for less than 5000kPa, so D1 and D3 are used, and for the rutting factor after aging, the decrease of the rutting factor after aging of D1 compared with D3 is only 0.16%, which is a small difference, so D1 is preferably used.
In summary, the optimal conditions determined in the examples of the present application are B3C3D1, i.e., the shear rate is 4500-.
According to the high-modulus modified asphalt mixture mixing ratio provided by the application, the high-low temperature performance, the water stability performance and the dynamic modulus of the provided DOA-SBS binary composite high-modulus modified asphalt mixture meet the technical requirements of high-modulus asphalt mixture construction and technical specifications (DB 21/T1754-2009) on high-modulus modified asphalt mixtures by adopting a domestic common Marshall mixing ratio design method.
The high-temperature performance test result shows that the high-temperature stability of the binary composite high-modulus asphalt mixture meets the requirement of a special road section of Bijing City landmark asphalt pavement anti-rutting technical Specification (DB 11/T1373-.
The trabecular bending test result shows that the destruction strain of the DOA-SBS binary composite high-modulus modified asphalt mixture is equivalent to that of a common asphalt mixture, and the low-temperature performance of the common asphalt mixture is considered.
Fatigue tests show that the fatigue performance of the binary composite high-modulus asphalt mixture provided by the application can completely meet the requirement of high-modulus anti-fatigue asphalt mixture for roads (GB/T36143-2018) on the high-modulus asphalt mixture, and the fatigue resistance is good.
The high-modulus modified asphalt produced by adopting the deoiled asphalt (DOA) and SBS binary composite modification not only has the characteristics of high modulus and good anti-rutting performance, but also has low-temperature performance, compared with the high-modulus additive, the high-modulus asphalt mixture prepared by using the modified asphalt mixture has the advantages of reduced performance variability of the mixture, obviously improved quality stability, no need of any modification on the existing mixing equipment, and obviously improved production efficiency of a mixing plant.
In a word, the DOA-SBS binary composite high-modulus modified asphalt provided by the application meets the requirements of high-modulus modified asphalt in high-modulus asphalt mixture construction and technical specification (DB 21/T1754-; compared with the addition of high modulus additives, the low-modulus additive has low cost and can effectively reduce the variability of the mixture.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention are included in the scope of protection of the present invention.
Claims (10)
1. A preparation method of DOA-SBS binary composite high-modulus modified asphalt comprises the following steps:
step 1: preparing the blended asphalt, namely heating the No. 70 asphalt to 175-200 ℃, adding the deoiled asphalt while stirring, and stirring until the deoiled asphalt and the No. 70 asphalt are completely melted to obtain the blended asphalt;
step 2: shearing and dispersing, namely heating the blended asphalt to 165-175 ℃, then gradually adding the SBS modifier, and shearing for 0.8-1.3 hours at the shearing rate of 4500-5800 rpm;
and step 3: stirring and developing, replacing a stirring device, adding a stabilizer while stirring, and stirring and developing at the temperature of 165-175 ℃ for 1.8-2.5 hours to obtain DOA-SBS binary composite high-modulus modified asphalt;
the high modulus polyethylene rubber is characterized in that a high modulus additive is not added, and the weight parts of the components are as follows:
2. the preparation method of the DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein the weight parts of the components are as follows:
3. the preparation method of the DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein the weight parts of the components are as follows:
4. the preparation method of the DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein the weight parts of the components are as follows:
5. the preparation method of DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein the No. 70 asphalt is Mabo (6:4) No. 70 asphalt.
6. The preparation method of the DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein the deoiled asphalt is Changqing deoiled asphalt or North China deoiled asphalt.
7. The method for preparing DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein in the step 1, No. 70 asphalt is heated to 190 ℃.
8. The method for preparing DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein in the step 2, the blended asphalt is heated to 170 ℃.
9. The method for preparing DOA-SBS binary composite high modulus modified asphalt according to claim 1, wherein in the step 3, stirring development is carried out at a temperature of 170 ℃.
10. A DOA-SBS binary composite high modulus modified asphalt prepared by the preparation method of the DOA-SBS binary composite high modulus modified asphalt according to any one of claims 1 to 9.
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|---|---|---|---|---|
| CN104650602A (en) * | 2015-02-06 | 2015-05-27 | 中国石油大学(华东) | High-grade road hard asphalt and preparation method thereof |
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| CN106189290A (en) * | 2016-07-12 | 2016-12-07 | 同济大学 | Modified asphalt material, its preparation method and application for airport pavement |
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| CN104650602A (en) * | 2015-02-06 | 2015-05-27 | 中国石油大学(华东) | High-grade road hard asphalt and preparation method thereof |
| CN105038279A (en) * | 2015-09-07 | 2015-11-11 | 重庆市智翔铺道技术工程有限公司 | Modified asphalt and preparing method thereof |
| CN106189290A (en) * | 2016-07-12 | 2016-12-07 | 同济大学 | Modified asphalt material, its preparation method and application for airport pavement |
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