CN114437555B - Mixed asphalt and preparation method thereof, asphalt mixture and preparation method thereof - Google Patents
Mixed asphalt and preparation method thereof, asphalt mixture and preparation method thereof Download PDFInfo
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- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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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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Abstract
The invention relates to the technical field of asphalt products, in particular to blended asphalt and a preparation method thereof, and an asphalt mixture and a preparation method thereof. The blended asphalt comprises hard component asphalt and soft component asphalt, wherein the weight ratio of the hard component asphalt to the soft component asphalt is 15-90:10-85; wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 46 ℃, the penetration is less than or equal to 60 10 ‑1 mm; the soft component asphalt satisfies the following conditions: the softening point is less than or equal to 51 ℃, and the penetration is more than or equal to 120 10 ‑1 mm. According to the invention, the blend asphalt with different brands can be flexibly obtained by adjusting the weight ratio of the hard component asphalt to the soft component asphalt, and in particular, the blend asphalt provided by the invention is used for preparing the asphalt mixture, and all performance parameters of the obtained asphalt mixture meet all requirements of the technical Specification for highway asphalt pavement construction (JTJ F40-2004) on the asphalt mixture.
Description
Technical Field
The invention relates to the technical field of asphalt products, in particular to blended asphalt and a preparation method thereof, and an asphalt mixture and a preparation method thereof.
Background
The road petroleum asphalt for paving is finished by a plurality of brands of asphalt products together according to different construction areas, environments and use function requirements. However, for oil refineries, each brand of bitumen product requires a single refinery-single storage-single transportation in order to ensure the quality of the bitumen product. In order to realize single refining, asphalt production enterprises need to continuously adjust process parameters to produce asphalt products with different grades, and unqualified products are very easy to appear in the process of adjusting the process parameters, and especially when two asphalt products with large grade interval are produced in a conversion mode, the unqualified products are inevitably produced; meanwhile, in order to avoid mutual pollution among asphalt products of different brands, a plurality of storage tanks with heating and heat preservation functions are built, and products of different brands are stored at high temperature, so that intermediate links and cost for asphalt production, storage and transportation are increased intangibly.
At present, the technology for producing asphalt by various domestic oil refining enterprises mostly adopts a distillation technology, selects proper crude oil resources, and obtains asphalt products with different brands by controlling the cutting temperature of distillation. However, sometimes, the asphalt produced is limited by the properties of crude oil to be processed, so that the produced asphalt is difficult to normally leave a factory due to the defect of certain properties, or different materials are blended by adopting a blending process to achieve a state of leaving the factory or being available in order to develop reasonable utilization ways of certain materials to improve the economic benefit, and the method is a passive means.
CN103030982a discloses a preparation method of blended asphalt, which comprises the following specific steps: blending 3-8 parts by weight of aromatic oil, 1-1.5 parts by weight of rosin resin and 100 parts by weight of No. 70 road petroleum asphalt at 120-130 ℃ and stirring for 0.5-1h to obtain No. 90A road petroleum asphalt with excellent performance and low price. The method upgrades the No. 70 road petroleum asphalt into the 90A road petroleum asphalt by adding a certain amount of aromatic hydrocarbon oil and rosin resin, but the price of the aromatic hydrocarbon oil and the rosin resin is far higher than that of the 90A road petroleum asphalt, so the method cannot be a low-price product production mode.
CN103740394a discloses a preparation method of high-grade road asphalt, which adopts medium-temperature coal asphalt as raw material, adds auxiliary agent into a polycondensation kettle after heating the medium-temperature coal asphalt, performs polycondensation reaction under nitrogen protection, controls reaction temperature and time, uses light component produced by polycondensation as fuel oil, and uses heavy component as hard component for asphalt blending; performing vacuum fractionation on the catalytic cracking slurry oil to obtain high-flash-point low-wax topped heavy slurry oil serving as a soft component for asphalt blending; and (3) carrying out online blending on the medium-temperature coal asphalt hard component and the topping heavy oil slurry according to a certain proportion to obtain the high-grade road petroleum asphalt. Namely, the method accelerates the polycondensation reaction rate of the medium-temperature coal tar pitch and improves the yield of heavy components by adding the auxiliary agent ferrocene, acetylene black or diphenylmethane into the medium-temperature coal tar pitch, but the process is complex, the polycondensation reaction needs to occur, multiple times of distillation is needed, and finally, the distilled kettle substrates are blended, so that the method is difficult to be used for industrial production.
Therefore, there is a need for stable production of asphalt products of different brands in a short time, and the process flow is simple, and frequent adjustment of process parameters is not required.
Disclosure of Invention
The invention aims to solve the problems that continuous production cannot be realized, the product quality is unstable, the preparation process flow is complex and the like of asphalt with different brands in the prior art, and provides blended asphalt and a preparation method thereof, an asphalt mixture and a preparation method thereof. The blended asphalt with stable product quality is obtained by adjusting the weight ratio of the hard component asphalt to the soft component asphalt, so that continuous production of different brands of blended asphalt is realized, and the industrial production is facilitated.
In order to achieve the above object, the first aspect of the present invention provides a blended asphalt comprising a hard component asphalt and a soft component asphalt, wherein the weight ratio of the hard component asphalt to the soft component asphalt is 15 to 90:10-85;
wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 46 ℃, the penetration is less than or equal to 60 10 -1 mm；
The soft component asphalt satisfies the following conditions: the softening point is less than or equal to 51 ℃, and the penetration is more than or equal to 120 10 -1 mm。
In a second aspect, the present invention provides a method for preparing a blended asphalt comprising mixing a hard component asphalt with a soft component asphalt in an amount of 15 to 90: blending the asphalt in a weight ratio of 10-85 to obtain blended asphalt;
wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 46 ℃, the penetration is less than or equal to 60 10 -1 mm；
The soft component asphalt satisfies the following conditions: the softening point is less than or equal to 51 ℃, and the penetration is more than or equal to 120 10 -1 mm。
The third aspect of the invention provides an asphalt mixture, which comprises blended asphalt and mineral aggregate, wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is the blended asphalt provided in the first aspect and/or the blended asphalt produced by the method provided in the second aspect.
The fourth aspect of the present invention provides a method for preparing an asphalt mixture, the method comprising: mixing the blended asphalt with mineral aggregate to obtain an asphalt mixture;
wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is the blended asphalt provided in the first aspect of the present invention and/or the blended asphalt prepared by the method provided in the second aspect of the present invention.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, the blended asphalt can be flexibly obtained by adjusting the weight ratio of the hard component asphalt to the soft component asphalt, so that the dependence on crude oil and the distillation process thereof is reduced; in particular, the stable production of the blended asphalt with different brands in a short time is realized, and the product qualification rate is greatly improved;
(2) The preparation method of the blended asphalt reduces the number of asphalt storage tanks, saves energy, reduces consumption and simplifies the process flow;
(3) The performance parameters of the blended asphalt provided by the invention all meet the requirements of heavy traffic road petroleum asphalt (GB/T15180-2010) on asphalt products of different brands, and particularly, the blended asphalt provided by the invention is used for preparing asphalt mixture, and the obtained asphalt mixture has the performance parameters which meet the requirements of road asphalt pavement construction technical Specification (JTJF 40-2004) on asphalt mixture, namely, the asphalt mixture has higher water stability, high temperature rutting resistance, low temperature performance and water immersion resistance.
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The first aspect of the invention provides a blended asphalt, which comprises hard component asphalt and soft component asphalt, wherein the weight ratio of the hard component asphalt to the soft component asphalt is 15-90:10-85;
wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 46 ℃, the penetration is less than or equal to 60 10 -1 mm；
The soft component asphalt satisfies the following conditions: the softening point is less than or equal to 51 ℃, and the penetration is more than or equal to 120 10 -1 mm。
The inventors of the present invention found in the study that: according to the penetration values of the blended asphalt (namely, the penetration ranges of the asphalt with different grades are different), the blended asphalt with different penetration values is obtained by adjusting the weight ratio of the hard component asphalt with high softening point and low penetration to the soft component asphalt with low softening point and high penetration, so that stable production of the blended asphalt with different grades in a short time is realized, and the qualification rate of the blended asphalt is improved.
Meanwhile, according to experimental regulations of highway and asphalt mixture, the blended asphalt provided by the invention is mixed with mineral aggregate to obtain asphalt mixture with higher water stability, high-temperature rutting resistance, low-temperature performance and water immersion resistance.
In the present invention, the penetration is given in 10 units, unless otherwise specified -1 mm。
In the present invention, the weight ratio of the high softening point, low penetration hard component asphalt to the low softening point, high penetration soft component asphalt depends on the penetration range of the blended asphalt, i.e., the penetration ranges of different brands of asphalt products are different, without specific explanation.
In order to further improve the high temperature properties of the blended asphalt, preferably, the hard component asphalt satisfies: the softening point is more than or equal to 55 ℃, preferably 55-65 ℃; the penetration is less than or equal to 5510 -1 mm, preferably 20-5510 -1 mm。
In order to further improve the creep properties of the blended asphalt, preferably, the soft component asphalt satisfies: the softening point is less than or equal to 45 ℃, preferably 38-45 ℃; penetration is more than or equal to 125.10 -1 mm, preferably 125-140 10 -1 mm。
Preferably, according to the present invention, the tempering leachThe green comprises hard component asphalt and soft component asphalt, wherein the weight ratio of the hard component asphalt to the soft component asphalt is 15-90:10-85; wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 55 ℃ and the penetration is less than or equal to 5510 -1 mm; the soft component asphalt satisfies the following conditions: the softening point is less than or equal to 45 ℃ and the penetration is more than or equal to 125 10 -1 mm。
According to the present invention, it is further preferred that the blended asphalt contains a hard component asphalt and a soft component asphalt in a weight ratio of 15 to 90:10-85; wherein, the hard component asphalt satisfies the following conditions: softening point of 55-65deg.C, penetration of 20-5510 -1 mm; the soft component asphalt satisfies the following conditions: softening point of 38-45deg.C, penetration of 125-140 10 -1 mm。
According to the present invention, preferably, the weight ratio of the hard component asphalt to the soft component asphalt is 20 to 80:20-80. With the preferred conditions, it is more advantageous to obtain a blended asphalt of performance parameters that meets the requirements associated with heavy traffic road petroleum asphalt (GB/T15180-2010).
According to a preferred embodiment of the present invention, the blended asphalt comprises a hard component asphalt and a soft component asphalt, the weight ratio of the hard component asphalt to the soft component asphalt being 20 to 80:20-80 parts; wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 55 ℃ and the penetration is less than or equal to 5510 -1 mm; the soft component asphalt satisfies the following conditions: the softening point is less than or equal to 45 ℃ and the penetration is more than or equal to 125 10 -1 mm。
According to a preferred embodiment of the present invention, the blended asphalt comprises a hard component asphalt and a soft component asphalt, the weight ratio of the hard component asphalt to the soft component asphalt being 20 to 80:20-80 parts; wherein, the hard component asphalt satisfies the following conditions: softening point of 55-65deg.C, penetration of 20-5510 -1 mm; the soft component asphalt satisfies the following conditions: softening point of 38-45deg.C, penetration of 125-140 10 -1 mm。
According to the invention, preferably, the wax content in the hard component asphalt and the soft component asphalt is independently less than or equal to 3 weight percent, preferably 0.8 to 2.5 weight percent, so as to ensure that the blended asphalt has better temperature sensing performance.
In some embodiments of the present invention, it is preferred that the hard component asphalt has an asphaltene content of 15 wt% or more, preferably 15 to 20 wt% based on the weight of the hard component asphalt, to ensure good high temperature stability of the blended asphalt.
In some embodiments of the present invention, it is preferred that the soft component asphalt has an asphaltene content of 0.1 to 10 wt%, preferably 0.5 to 8 wt%, based on the weight of the soft component asphalt, which ensures good tackiness of the blended asphalt while having a certain colloidal stability.
According to the invention, preferably, the PG performance grade of the soft component asphalt is low temperature less than or equal to-22 ℃, preferably less than or equal to-28 ℃, more preferably from-28 ℃ to-34 ℃, so as to ensure that the blended asphalt has better low temperature performance.
In the present invention, the hard component asphalt has a wide selection range as long as the hard component asphalt has the characteristics of high softening point and low penetration. Preferably, the cutting temperature of the hard component pitch is 530-545 ℃.
In the present invention, the cutting temperature refers to the fluctuation range of the initial distillation point of the hard component asphalt or the soft component asphalt, which is between the characteristics of the hard component asphalt and the soft component asphalt, and generally does not consider the 10% distillation point, even the final distillation point or the dry point of the hard component asphalt or the soft component asphalt. Thus, the cutting temperature of the hard component asphalt or the soft component asphalt corresponds to the boiling point of the hard component asphalt or the soft component asphalt.
In the present invention, the types of the hard component asphalt have a wide selection range, and preferably the hard component asphalt is at least one selected from the group consisting of deep drawing vacuum residuum, deoiling asphalt, oxidized asphalt, natural asphalt and lake asphalt, and preferably at least one selected from the group consisting of deep drawing vacuum residuum, deoiling asphalt and oxidized asphalt.
In some embodiments according to the present invention, preferably, the deep drawn vacuum residuum is produced using a distillation deep drawing process; the deoiling asphalt is prepared by adopting a solvent deasphalting process; the oxidized asphalt is prepared by a deep oxidation process.
In the invention, the soft component asphalt has a wider selection range, so long as the soft component asphalt has the characteristics of low softening point and high penetration. Preferably, the cutting temperature of the soft component asphalt is 500-515 ℃.
Preferably, the soft component asphalt is selected from at least one of vacuum residuum, furfural refined extract oil, distillate oil and solvent deasphalted heavy deasphalted oil, preferably from vacuum residuum and/or furfural refined extract oil.
According to some preferred embodiments of the invention, the vacuum residuum is produced using a distillation process and the furfural-refined extract oil is produced using a furfural refining process.
The performance parameters of the blended asphalt provided by the invention meet the requirements of heavy traffic road petroleum asphalt (GB/T15180-2010) on asphalt of different brands.
According to the present invention, preferably, the blended asphalt satisfies: penetration of 20-140 10 -1 mm, softening point is 38-65 ℃.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration of 120-140 10 -1 The softening point of the asphalt is 38-51 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-130 brand asphalt products in GB/T15180-2010 and is a qualified AH-130 product.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration is 100-120 10 -1 The softening point of the asphalt is 40-53 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-110 brand asphalt products in GB/T15180-2010 and is a qualified AH-110 product.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration of 80-100 10 -1 The softening point of the asphalt is 42-55 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-90 brand asphalt products in GB/T15180-2010 and is a qualified AH-90 product.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration of 60-80 10 -1 The softening point of the asphalt is 44-57 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-70 brand asphalt products in GB/T15180-2010 and is a qualified AH-70 product.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration of 40-60 10 -1 The softening point of the asphalt is 45-58 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-50 brand asphalt products in GB/T15180-2010 and is a qualified AH-50 product.
According to one embodiment of the invention, preferably, when the blended asphalt satisfies: penetration of 20-40 10 -1 The softening point of the asphalt is 50-65 ℃, and each performance parameter of the blended asphalt meets the technical index requirements of AH-30 brand asphalt products in GB/T15180-2010 and is a qualified AH-30 product.
In a second aspect, the present invention provides a method for preparing a blended asphalt comprising mixing a hard component asphalt with a soft component asphalt in an amount of 15 to 90: blending the asphalt in a weight ratio of 10-85 to obtain blended asphalt;
wherein, the hard component asphalt satisfies the following conditions: the softening point is more than or equal to 46 ℃, the penetration is less than or equal to 60 10 -1 mm；
The soft component asphalt satisfies the following conditions: the softening point is less than or equal to 51 ℃, and the penetration is more than or equal to 120 10 -1 mm。
In the present invention, the condition of the reconciliation has a wide selection range, and preferably the condition of the reconciliation includes: the temperature is 80-200deg.C, preferably 100-150deg.C; the time is 5-60min, preferably 10-40min; the rotation speed is 100-1000r/min, preferably 100-500r/min. The adoption of the preferable condition range is more beneficial to the uniformity of the components of the blended asphalt and the heat aging of the asphalt is avoided.
In the invention, the mode of blending has a wider selection range, and only a certain weight ratio of hard component asphalt and soft component asphalt are uniformly mixed. Preferably, the blending is performed in a blender, mixer.
According to the invention, preferably, the method further comprises: stirring and/or shearing the blended product to obtain blended asphalt; further preferably, the stirring is aimed at rapidly breaking up the micelles, and the shearing is aimed at rapidly shearing large particles into small particles. The stirring and shearing modes have a wide selection range, and the invention is not repeated.
The third aspect of the invention provides an asphalt mixture, which comprises blended asphalt and mineral aggregate, wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is the blended asphalt provided in the first aspect and/or the blended asphalt produced by the method provided in the second aspect.
In the invention, the mineral aggregate has a wider selection range, as long as the mineral aggregate meets the AC-20 medium-grain and dense-graded asphalt concrete mixture.
The asphalt mixture provided by the invention has various performance parameters meeting the requirements of the technical Specification for highway asphalt pavement construction (JTJF 40-2004) on the asphalt mixture, namely, the asphalt mixture has higher water stability, high-temperature rut resistance, low-temperature performance and water immersion resistance.
The fourth aspect of the present invention provides a method for preparing an asphalt mixture, the method comprising: mixing the blended asphalt with mineral aggregate to obtain an asphalt mixture;
wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is the blended asphalt provided in the first aspect and/or the blended asphalt produced by the method provided in the second aspect.
According to the present invention, it is preferable that the blended asphalt and the mineral aggregate are each independently subjected to heat treatment before the mixing, so that the blended asphalt and the mineral aggregate are rapidly and uniformly adhered.
In some embodiments of the invention, it is preferred that the temperature of the heat treated blended asphalt is greater than or equal to 100 ℃, preferably from 100 ℃ to 160 ℃.
In some embodiments of the invention, preferably, the temperature of the heat treated mineral aggregate is greater than or equal to 200 ℃, preferably 200-240 ℃.
In the present invention, the mixing conditions have a wide range of choices, as long as the blended asphalt is uniformly mixed with the mineral aggregate. Preferably, the mixing conditions include: the time is less than or equal to 200s, preferably 30-150s; the rotation speed is 100-800r/min, preferably 100-400r/min. The adoption of the preferable condition is more beneficial to the contact between the blended asphalt and the surface of the mineral aggregate, so that the blended asphalt is uniformly wrapped on the surface of the mineral aggregate, and the binding force between the blended asphalt and the mineral aggregate is enhanced.
The invention will be illustrated by means of specific examples.
The technical requirements of heavy traffic road petroleum asphalt (GB/T15180-2010) are listed in Table 1.
TABLE 1
The performance parameters of sand-neutralized amann blended crude oils in examples and comparative examples are listed in table 2.
TABLE 2
| Performance parameters | Test data |
| Density (20 ℃ C.)/(g/cm) 3 ) | 0.8647 |
| Carbon residue value/wt% | 4.73 |
| Sulfur content/wt% | 1.65 |
| Viscosity (50 ℃ C.)/(mm 2 /s) | 8.22 |
| Viscosity (80 ℃ C.)/(mm 2 /s) | 4.65 |
| Wax content/wt% | 3.85 |
| Gum/wt% | 9.66 |
| Asphaltenes/wt% | 1.49 |
| Characteristic factor (K) | 11.9 |
The performance parameters of the deoiled asphalt (sand light residue-reducing butane deoiled asphalt) obtained after solvent deasphalting the vacuum residuum of sand light crude oil are shown in table 3.
TABLE 3 Table 3
Preparation example
The real boiling point distillation was carried out using the sand-neutralized amann mixed crude oil as a raw material, and the cutting temperatures of the distillation were controlled to 500 ℃ and 545 ℃ to obtain two vacuum residuum having needle penetration of 131 (1/10 mm) and 58 (1/10 mm) at 25 ℃ respectively, which were subjected to property analysis according to the analysis items specified in GB/T15180-2010, and the results are shown in table 4.
TABLE 4 Table 4
As can be seen from the data in Table 4, sand neutralized Aban's mixed crude oil distillation resulted in a penetration of 131 (10) - 1 mm) and 58 (10 -1 mm) meets the technical index requirements (Table 1) of two brands of asphalt products AH-130 and AH-50 in GB/T15180-2010, respectively, and is a qualified AH-130 product and AH-50 product.
Example 1
Blending the vacuum residuum-I (soft component asphalt) and vacuum residuum-II (hard component asphalt) obtained in table 4 in a weight ratio of 68:32, wherein the conditions of blending include: the temperature is 120 ℃, the time is 20min, and the rotating speed is 300r/min, so as to obtain the blended asphalt S1;
wherein the performance parameters of the blended asphalt S1 are shown in Table 5.
Examples 2 to 3
According to the method of example 1, except that the weight ratio of vacuum residuum-I to vacuum residuum-II was replaced with 42:58, 25:75, respectively, to obtain blended asphalt S2-3, respectively;
wherein the performance parameters of the blended asphalt S2-3 are shown in Table 5.
TABLE 5
Note that: 1-means the weight ratio of reduced pressure distillation-I to reduced pressure distillation-II.
As can be seen from the data in Table 5, the blended asphalt S1-3 with penetration at 25℃of 108 (1/10 mm), 89 (1/10 mm) and 76 (1/10 mm) has properties meeting the technical index requirements of three brands of asphalt products AH-110, AH-90 and AH-70 in GB/T15180-2010, respectively, and is a qualified AH-110, AH-90 and AH-70 product.
Example 4
Vacuum residuum-I (soft component asphalt) in table 4 was blended with sand light slag reducing butane deoiling asphalt (hard component asphalt) in table 3 at a weight ratio of 79:21, wherein the conditions for blending included: the temperature is 130 ℃, the time is 20min, the rotating speed is 300r/min, and the blended asphalt S4 is obtained;
wherein the performance parameters of the blended asphalt S4 are listed in Table 6.
Examples 5 to 7
The procedure of example 4 was followed except that the weight ratio of vacuum residuum-I to sand light slag-reducing butane deoiling asphalt was changed, and the blending conditions were changed, to give a blended asphalt S5-7;
wherein the performance parameters of the blended asphalt S5-7 are listed in Table 6.
TABLE 6
Note that: 2-refers to the weight ratio of vacuum residuum-I to sand light slag reducing butane deoiling asphalt.
As can be seen from the data in Table 6, the properties of blended asphalt S4-7, which are blended to obtain asphalt products with penetration at 25℃of 108 (1/10 mm), 84 (1/10 mm), 75 (1/10 mm) and 56 (1/10 mm), meet the technical index requirements of four brands of asphalt products, AH-110, AH-90, AH-70 and AH-50, in GB/T15180-2010, respectively, and are qualified AH-110, AH-90, AH-70 and AH-50 products.
Comparative examples 1 to 5
The sand-neutralized Acman-mixed crude oil in Table 2 was used as a raw material for distillation at a true boiling point, and the cutting temperature of the distillation was controlled to 500 ℃, 515 ℃, 525 ℃, 540 ℃ and 545 ℃ to obtain blended asphalt D1-5 having penetration degrees of 131 (1/10 mm), 101 (1/10 mm), 88 (1/10 mm), 72 (1/10 mm) and 58 (1/10 mm), respectively, at 25 ℃. The analysis was performed according to the analysis items specified in GB/T15180-2010, and the results are shown in Table 7.
TABLE 7
As can be seen from the data in Table 7, by varying the cutting temperature, asphalt having penetration satisfying the respective brands specified in GB/T15180 can be obtained, and each performance thereof can satisfy the index requirements of the corresponding brands of products. However, as can be seen from the data in Table 7, for all three brands of asphalt obtained by distillation, which meet the AH-110, AH-90 and AH-70, the penetration was the lower limit of penetration for that brand of asphalt product, and slight fluctuations in the process conditions would become an off-grade product for that brand. Therefore, the requirements of the asphalt products with different brands on the process conditions of operation and the stability of operation are very strict by directly obtaining the asphalt products with different brands through changing the distillation cutting temperature.
As can be seen from the data in tables 5-7, the invention obtains different grades of blended asphalt by blending the hard component asphalt with high softening point and low penetration with the soft component asphalt with low softening point and high penetration in different weight ratios, and each performance parameter of the blended asphalt meets the relevant requirements of heavy traffic road petroleum asphalt (GB/T15180-2010).
Test case
The blended asphalt (S1-7 and D1-5) prepared in examples 1-7 and comparative examples 1-5 was used to prepare asphalt mixtures SP1-7 and DP1-5.
Asphalt mixtures were prepared according to the method disclosed by JTJ F40-2000, namely:
blending asphalt (S1-7 and D1-5) preheated to 150 ℃ and mineral aggregate (the gradation range of the mineral aggregate is shown in table 8) preheated to 210 ℃ were mixed in different weight ratios, respectively, wherein the conditions of the blending include: the time is 60s, the rotating speed is 300r/min, and asphalt mixtures SP1-7 and DP1-5 are obtained;
wherein the performance parameters of the asphalt mixtures SP1-7 and DP1-5 are listed in Table 9.
TABLE 8
TABLE 9
Continuing to watch 9
Continuing to watch 9
As can be seen from the data in Table 9, the blended asphalt provided by the invention is used for preparing asphalt mixture, and each performance parameter of the prepared asphalt mixture meets each requirement of the technical Specification for construction of Highway asphalt pavement (JTJ F40-2004) on the asphalt mixture, namely, the asphalt mixture has higher water stability, high-temperature rutting resistance, low-temperature performance and water immersion resistance.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.
Claims (15)
1. The blended asphalt is characterized by comprising hard component asphalt and soft component asphalt, wherein the weight ratio of the hard component asphalt to the soft component asphalt is 15-90:10-85;
wherein, the hard component asphalt satisfies the following conditions: the softening point is 46-65 ℃ and the penetration is less than or equal to 60.10 -1 mm；
The soft component asphalt satisfies the following conditions: softening point is less than or equal to 51 ℃ and penetration is 120-140 10 -1 mm；
Wherein the wax content in the hard component asphalt and the soft component asphalt is respectively and independently less than or equal to 3 weight percent; the asphaltene content in the hard component asphalt is 15-20 wt% based on the weight of the hard component asphalt; the content of asphaltene in the soft component asphalt is 0.1-10 wt% based on the weight of the soft component asphalt; the PG performance grade of the soft component asphalt is low at less than or equal to-22 ℃.
2. The blended asphalt of claim 1, wherein the hard component asphalt satisfies: the softening point is 55-65 ℃; the penetration is less than or equal to 5510 -1 mm；
And/or, the soft component asphalt satisfies: the softening point is less than or equal to 45 ℃; penetration is 125-140 10 -1 mm。
3. The blended asphalt of claim 1, wherein the hard component asphalt satisfies: penetration of 20-5510 - 1 mm；
And/or, the soft component asphalt satisfies: the softening point is 38-45 ℃.
4. The blended asphalt of claim 1 wherein the weight ratio of hard component asphalt to soft component asphalt is from 20 to 80:20-80.
5. The blended asphalt of any of claims 1-4, wherein the hard component asphalt and the soft component asphalt each independently have a wax content of 0.8-2.5 wt%; and/or, the soft component asphalt has an asphaltene content of 0.5 to 8 wt%, based on the weight of the soft component asphalt;
and/or the PG performance grade of the soft component asphalt is lower than or equal to minus 28 ℃.
6. The blended asphalt of claim 5, wherein the soft component asphalt has a PG performance grade low temperature of-28 ℃ to-34 ℃.
7. The blended asphalt of any of claims 1-4, wherein the hard component asphalt has a cutting temperature of 530-545 ℃;
and/or the hard component asphalt is at least one selected from deep drawing vacuum residuum, deoiling asphalt, oxidized asphalt, natural asphalt and lake asphalt;
and/or the cutting temperature of the soft component asphalt is 500-515 ℃;
and/or the soft component asphalt is at least one selected from vacuum residuum, furfural refined extract oil, distillate oil and solvent deasphalted heavy deasphalted oil.
8. A method for preparing blended asphalt, which is characterized in that hard component asphalt and soft component asphalt are mixed according to 15-90: blending the asphalt in a weight ratio of 10-85 to obtain blended asphalt;
wherein, the hard component asphalt satisfies the following conditions: the softening point is 46-65 ℃ and the penetration is less than or equal to 60.10 -1 mm；
The soft component asphalt satisfies the following conditions: softening point is less than or equal to 51 ℃ and penetration is 120-140 10 -1 mm；
Wherein the wax content in the hard component asphalt and the soft component asphalt is respectively and independently less than or equal to 3 weight percent; the asphaltene content in the hard component asphalt is 15-20 wt% based on the weight of the hard component asphalt; the content of asphaltene in the soft component asphalt is 0.1-10 wt% based on the weight of the soft component asphalt; the PG performance grade of the soft component asphalt is low at less than or equal to-22 ℃.
9. The method of claim 8, wherein the reconciliation conditions comprise: the temperature is 80-200 ℃; the time is 5-60min; the rotating speed is 100-1000r/min.
10. The method of claim 9, wherein the reconciliation conditions comprise: the temperature is 100-150 ℃; the time is 10-40min; the rotating speed is 100-500r/min.
11. The asphalt mixture is characterized by comprising blended asphalt and mineral aggregate, wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is selected from the blended asphalt of any one of claims 1-7, or the blended asphalt produced by the method of any one of claims 8-10.
12. A method for preparing an asphalt mixture, the method comprising: mixing the blended asphalt with mineral aggregate to obtain an asphalt mixture;
wherein the weight ratio of the blended asphalt to the mineral aggregate is 1-10:100;
wherein the blended asphalt is selected from the blended asphalt of any one of claims 1-7, or the blended asphalt produced by the method of any one of claims 8-10.
13. The method of claim 12, wherein the blended asphalt and mineral aggregate are each independently heat treated prior to the mixing.
14. The method of claim 13, wherein the temperature of the post heat treatment blended asphalt is greater than or equal to 100 ℃;
and/or, the temperature of the mineral aggregate after heat treatment is more than or equal to 200 ℃;
and/or, the mixing conditions include: the time is less than or equal to 200s; the rotating speed is 100-800r/min.
15. The method of claim 13, wherein the temperature of the post heat treatment blended asphalt is 100-160 ℃;
and/or the temperature of the mineral aggregate after heat treatment is 200-240 ℃;
and/or, the mixing conditions include: the time is 30-150s; the rotating speed is 100-400r/min.
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