CN117304701A - Screening method of low-grade asphalt raw material for high-modulus asphalt and application thereof - Google Patents
Screening method of low-grade asphalt raw material for high-modulus asphalt and application thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 176
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- 238000012216 screening Methods 0.000 title claims abstract description 19
- 239000002994 raw material Substances 0.000 title abstract description 18
- 239000003607 modifier Substances 0.000 claims abstract description 34
- 239000000203 mixture Substances 0.000 claims description 38
- 238000010008 shearing Methods 0.000 claims description 26
- 239000003381 stabilizer Substances 0.000 claims description 26
- 239000000084 colloidal system Substances 0.000 claims description 20
- 229920000642 polymer Polymers 0.000 claims description 20
- 239000004606 Fillers/Extenders Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000035515 penetration Effects 0.000 claims description 16
- 230000032683 aging Effects 0.000 claims description 13
- 238000011161 development Methods 0.000 claims description 10
- 230000018109 developmental process Effects 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 7
- 125000003118 aryl group Chemical group 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 238000002156 mixing Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 8
- 239000011384 asphalt concrete Substances 0.000 description 7
- 240000007849 Macleaya cordata Species 0.000 description 5
- 239000003623 enhancer Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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Abstract
The invention relates to a screening method of low-grade asphalt raw materials for high-modulus asphalt and application thereof, in particular to a screening method of low-grade asphalt raw materials for high-modulus asphalt of long-life asphalt pavement and application thereof. The invention improves the comprehensive performance of the high-modulus modified asphalt by screening the specific low-grade asphalt, and avoids the practical problem of poor comprehensive performance of the high-modulus modified asphalt caused by poor compatibility between the low-grade asphalt and the modifier.
Description
Technical Field
The invention belongs to the technical field of asphalt modification, and particularly relates to a screening method of low-grade asphalt raw materials for high-modulus asphalt and application thereof, in particular to a screening method of low-grade asphalt raw materials for high-modulus asphalt of long-service-life asphalt pavement and application thereof.
Background
Along with the increase of road traffic, factors such as overload problems, traffic channelization and the like cause that the asphalt pavement is seriously damaged in early stage, so that the service life of the pavement is far from the design life. The design concept of the high-modulus asphalt mixture is that the modulus of the asphalt mixture is improved, the plastic deformation of asphalt concrete under the action of vehicle load is reduced, the high-temperature rutting resistance of the pavement is improved, the fatigue resistance of the asphalt mixture is improved, and the service life of the pavement is prolonged. The high-modulus asphalt mixture can effectively solve the service life problem of the pavement, and the core is the high-modulus asphalt.
High modulus asphalt concrete refers to asphalt capable of significantly improving the stiffness modulus and fatigue resistance of asphalt mixtures, and is called high modulus asphalt concrete. The high modulus asphalt concrete achieves the purpose of improving stiffness modulus and fatigue resistance through the characteristics of high modulus asphalt cement, high cement consumption, low void ratio and the like. Asphalt concrete with complex modulus (15 ℃ C., 10 Hz) equal to or more than 14000MPa can be made into high-modulus asphalt concrete according to the definition in French high-modulus asphalt concrete standard NFP 98-140. The high-modulus asphalt is generally prepared by three methods, namely, the hard asphalt is directly adopted, but the high-temperature rutting resistance of the hard asphalt mixture is effectively verified, but the low-temperature and fatigue resistance of the hard asphalt mixture are poor. Secondly, the high-modulus additive is added into the common asphalt, but the problems of compatibility risk of the high-modulus additive and the matrix asphalt, mixing uniformity and the like exist. Thirdly, preparing high-modulus asphalt by adding the modifier into the hard asphalt, and selecting proper modifier and modification process, so that the overall modulus and high-temperature performance of the material are improved, and meanwhile, the low-temperature performance of the material is not too great, wherein the hard asphalt can be obtained by different modes and different raw materials, the compatibility difference between the different raw materials and the hard asphalt modifier obtained by different production processes is large, and good compatibility is the basis for preparing the high-modulus asphalt with excellent comprehensive performance.
The high-modulus asphalt modified by the hard asphalt has the most excellent comprehensive performance and combines high-temperature rutting resistance, low-temperature cracking resistance and fatigue performance. However, the production methods of the raw material hard asphalt are various, including distillation, oxidation, solvent deasphalting, blending and the like, and different raw materials and different production processes are adopted to affect the performance of the hard asphalt differently, so that the modification effect is further affected, and the performance of the high-modulus asphalt is further affected. In the existing high-modulus modified asphalt patent literature prepared by modifying hard asphalt, the hard asphalt product often only limits two indexes of penetration and softening point, and only the two indexes are used for selecting the hard asphalt, so that certain risks exist, such as raw material stability, compatibility with a modifier and the like, and finally good performance of the comprehensive performance of the high-modulus modified asphalt is influenced.
Disclosure of Invention
In order to improve the above technical problems, the present invention provides a low-grade asphalt having the following features (a) and (b):
(a) The penetration at 25 ℃ is 30-50dmm;
(b) The softening point is 52-60 ℃;
and has one or more selected from the following features (c) to (g):
(c) The colloid instability coefficient is not more than 45%;
(d) A kinematic viscosity at 135 ℃ of not more than 1.0 Pa.s;
(e) The penetration ratio is not less than 63%;
(f) Solubility is not less than 99%;
(g) No crust after aging.
Preferably, the low grade bitumen has features (a) and (b), and two or more of (c) to (g). More preferably, the low grade bitumen has all of the features (a) to (g) above.
According to an embodiment of the present invention, the above characteristics are measured by 25℃penetration, softening point, 135℃kinematic viscosity and solubility reference JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure.
According to an embodiment of the present invention, in the above feature, the colloidal instability coefficient is detected by:
(1) The quality of asphaltene, saturated fraction, colloid and aromatic fraction is measured according to JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure; and
(2) The colloid instability coefficient is calculated according to the following formula: colloid instability coefficient= (asphaltene+saturation fraction)/(colloid+aromatic fraction) mass ratio x 100%.
According to the embodiment of the invention, in the characteristics, the judging standard of the state after aging is that a film oven test is finished according to the T0609-2011 test in JTG E20-2011 test procedure of asphalt and asphalt mixture for highway engineering, and a glass rod is used for picking up an asphalt sample in an aging disc to observe whether skinning exists or not.
According to an embodiment of the invention, the penetration of the low grade bitumen at 25℃is preferably between 30 and 38dmm.
According to an embodiment of the present invention, the softening point of the low grade bitumen is preferably 52-56 ℃.
According to an embodiment of the present invention, the low grade bitumen preferably has a colloid instability coefficient of 40-45%, and more preferably 41-43%.
According to an embodiment of the invention, the low grade bitumen has a kinematic viscosity at 135 ℃ of 0.6 to 0.8 Pa.s.
According to an embodiment of the present invention, the low grade bitumen has a solubility of 99.0% to 99.7%.
According to an embodiment of the present invention, the penetration ratio of the low grade bitumen is preferably 63% to 68%, and more preferably 65% to 66%.
The present invention also provides a screening method of low-grade asphalt, the method comprising detecting low-grade asphalt and screening low-grade asphalt having the above-described features (a) and (b), and one or more selected from the features (c) to (g).
According to an embodiment of the present invention, the screening method may include preparing low-grade asphalt to be detected, and then detecting the prepared low-grade asphalt to be detected, and screening the low-grade asphalt having the above-described features (a) and (b), and one or more selected from the features (c) to (g).
The screening method of low-grade asphalt according to the present invention, wherein low-grade asphalt having two or more of features (a) and (b), and (c) to (g) is screened; more preferably, the low-grade asphalt having all of the features (a) to (g) above is screened.
According to an embodiment of the present invention, the method for preparing the low-grade asphalt to be detected is not particularly limited, as long as the product thereof is screened by the above screening method.
The invention also provides a mixture comprising the low grade bitumen as described above. Preferably, the mixture further comprises at least one, such as one, two or three, of a polymer modifier, a stabilizer, a extender. For example, the mixture further comprises a polymer modifier, a stabilizer, and a extender.
According to an embodiment of the invention, the mixture comprises the following components in parts by weight:
500 parts of the low-grade asphalt;
10-35 parts of polymer modifier;
0.1-5 parts of stabilizer;
1-20 parts of a extensibility agent.
According to an embodiment of the present invention, the weight part of the polymer modifier may be 15 to 30 parts.
According to an embodiment of the present invention, the stabilizer may be 1 to 4 parts by weight.
According to an embodiment of the present invention, the extender may be 6 to 15 parts by weight.
According to an embodiment of the invention, the polymer modifier is, for example, a block copolymer of styrene-butadiene-styrene.
According to an embodiment of the present invention, the molecular weight of the block copolymer of styrene-butadiene-styrene is not less than 10 ten thousand, more preferably 10 to 20 ten thousand.
According to an embodiment of the present invention, the block ratio of the styrene-butadiene-styrene block copolymer is preferably 3:7 to 4:6, more preferably 3:7.
According to embodiments of the present invention, the polymer modifier may be 791SBS (also known as SBS 791), such as 791SBS produced by Yueyang petrochemical industry.
Illustratively, the polymer modifier may be 15 parts, 16 parts, 18 parts, 20 parts, 22 parts, 22.5 parts, 24 parts, 26 parts, 28 parts, 30 parts by weight.
According to an embodiment of the invention, the stabilizer is at least one of a stabilizer HMD-2 produced by Dongying Feng Bo more petroleum technology Co., ltd, and a full-protection stabilizer ZQ-WDJ in Shandong.
Illustratively, the stabilizer is present in an amount of 1 part, 2 parts, 3 parts, 4 parts.
According to an embodiment of the invention, the extender is one produced by Toyomanter petrochemical Co., ltd, and has a kinematic viscosity of 38+ -1 mm at 100deg.C 2 And/s, flash point > 210 ℃.
Illustratively, the extender is present in an amount of 6 parts, 8 parts, 10 parts, 12 parts, 13 parts, 14 parts, 15 parts.
As an example, the mixture includes: 500 parts of low-grade asphalt, 22.5 parts of polymer modifier, 1 part of stabilizer and 10 parts of extender.
The invention also provides a preparation method of the mixture, which comprises the step of mixing the low-grade asphalt with other components to prepare the mixture.
According to embodiments of the present invention, the other components may be selected from, for example, one, two or three of the polymer modifiers, stabilizers, extenders, etc., described above. For example, the other component is selected from the group consisting of polymer modifiers, stabilizers, and extenders.
The invention also provides application of the low-grade asphalt, the screening method or the mixture in preparing high-modulus asphalt.
The present invention also provides a high modulus asphalt, wherein the high modulus asphalt comprises a mixture as described above. Preferably, the high modulus asphalt is prepared by treating the mixture described above under heating conditions.
The invention also provides a process for preparing a high modulus asphalt comprising treating the mixture described above under heating.
According to an embodiment of the present invention, the treatment under heating conditions may include at least one of shearing, development, defoaming, and the like; alternatively, the treatment under heating may include the steps of shearing, development, and defoaming.
According to an embodiment of the invention, the method comprises the steps of:
s1) mixing low-grade asphalt, a polymer modifier and a extensibility agent, and shearing under heating to obtain an intermediate material;
s2) mixing the intermediate material with a stabilizer, and stirring to obtain a mixture;
s3) standing, developing and defoaming the mixture to obtain the low-grade asphalt mixture.
According to an embodiment of the invention, the temperature of the shearing is 180 ℃.
According to an embodiment of the invention, the shear rate is 4500r/min.
According to an embodiment of the invention, the shear time is 1.0h.
According to an embodiment of the invention, the temperature of the agitation is 177 ℃.
According to an embodiment of the invention, the stirring speed is 800r/min.
According to an embodiment of the invention, the stirring time is 1.0h.
According to an embodiment of the invention, the temperature for the rest development and defoaming is 175-185 ℃, more preferably 177 ℃; the defoaming time is preferably 20 to 40 minutes.
The invention also provides application of the high-modulus asphalt in engineering materials, particularly pavement materials.
The invention has the beneficial effects that:
the screening method of the low-grade asphalt uses 25 ℃ penetration, softening point, colloid instability coefficient, 135 ℃ viscosity, penetration ratio, solubility, aging state and the like of the low-grade asphalt as technical requirements of selection, and uses the index of the high-modulus asphalt as verification basis. The specific low-grade asphalt improves the comprehensive performance of the high-modulus modified asphalt, and avoids the practical problem of poor comprehensive performance of the high-modulus modified asphalt caused by poor compatibility between the low-grade asphalt and the modifier.
The invention adopts specific low-grade asphalt, can ensure the uniform stability of raw materials and the good suitability with the modifier, and ensures that the prepared high-modulus modified asphalt has excellent comprehensive properties (such as high-temperature performance, low-temperature performance and fatigue resistance). The problems of poor product construction and dissimilarity, poor modified compatibility in the production process, abnormal raw material stability and the like are solved.
Detailed Description
The technical scheme of the invention will be further described in detail below with reference to specific embodiments. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods. Wherein the polymer modifier is 791SBS purchased from Yueyang petrochemical industry; the Boyue stabilizer is a stabilizer HMD-2 produced by Toyo Feng Bo Yue Petroleum technology Co., ltd; the Mantex extender is produced by Mantex petrochemical company, and has 100 deg.c motionViscosity of 38+ -1 mm 2 And/s, flash point > 210 ℃.
In the following examples and comparative examples, the solubility, the colloid instability coefficient, the state after aging, the penetration at 25℃and the softening point of low grade asphalt and modified asphalt were measured for the kinematic viscosity at 135℃as follows:
the penetration at 25 ℃, the softening point, the kinematic viscosity at 135 ℃ and the solubility are detected by reference JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure.
Colloid instability coefficient: the mass of asphaltene, saturation fraction, colloid and aromatic fraction is measured according to JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure, and colloid instability coefficient is calculated according to the following formula:
colloid instability coefficient= (asphaltene+saturation fraction)/(colloid+aromatic fraction) mass ratio x 100%.
Judgment criteria for post-aging conditions: and (3) finishing a film oven test according to a T0609-2011 test in JTG E20-2011 test procedure of highway engineering asphalt and asphalt mixture, picking up an asphalt sample in an aging disc by using a glass rod, and observing whether skinning exists or not.
Example 1
The asphalt with low grade 1# (index is shown in table 1) is obtained by mixing and distilling two crude oils from south America, and 500 parts of the raw materials; 22.5 parts of polymer modifier 791SBS; 1 part of the macleaya cordata stabilizer; 10 parts of Mantex extender.
The preparation method comprises the following steps: adding a polymer modifier and a ductility enhancer into low-grade asphalt 1# to heat to 180 ℃, shearing for 1.0h at a shearing rate of 4500r/min by a shearing machine, transferring to a constant-temperature heating jacket after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, and transferring to a same-temperature oven for standing development/defoaming for 20min to obtain high-modulus asphalt 1# (indexes are shown in Table 2).
Example 2
The low-grade asphalt No. 2 (index is shown in table 1) is obtained by mixing deoiled asphalt, wax oil and conventional No. 70 asphalt (the mass ratio of the deoiled asphalt to the wax oil is 30:10:70) by adopting a blending method, and 500 parts of the raw materials are obtained; 22.5 parts of polymer modifier 791SBS; 1 part of the macleaya cordata stabilizer; 10 parts of Mantex extender.
The preparation method comprises the following steps: adding a modifier and a ductility enhancer into low-grade asphalt No. 2, heating to 180 ℃, shearing for 1.0h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, and transferring to a same-temperature oven for standing development/defoaming for 20min to obtain high-modulus asphalt No. 2 (indexes are shown in Table 2).
Comparative example 1
Low grade asphalt 3# (index is shown in table 1) is obtained by distilling certain crude oil from Xinjiang, and 500 parts of the raw material is obtained; 22.5 parts of polymer modifier 791SBS; 1 part of the macleaya cordata stabilizer; 10 parts of Mantex extender.
The preparation method comprises the following steps: adding a modifier and a ductility enhancer into low-grade asphalt 3# to heat to 180 ℃, shearing for 1.0h at a shearing rate of 4500r/min by a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, and transferring to a same-temperature oven for standing development/defoaming for 20min to obtain high-modulus asphalt 3# (indexes are shown in Table 2).
Comparative example 2
The low-grade asphalt No. 4 (index is shown in table 1) is obtained by mixing conventional No. 70 asphalt and deoiled asphalt (the mass ratio of the asphalt to the deoiled asphalt is 100:10.5) by adopting a blending method, and 500 parts of the raw materials are obtained; 22.5 parts of polymer modifier 791SBS; 1 part of the macleaya cordata stabilizer; 10 parts of Mantex extender.
The preparation method comprises the following steps: adding a modifier and a ductility enhancer into low-grade asphalt No. 4, heating to 180 ℃, shearing for 1.0h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, and transferring to a same-temperature oven for standing development/defoaming for 20min to obtain high-modulus asphalt No. 4 (indexes are shown in Table 2).
Comparative example 3
The low-grade asphalt No. 5 (index is shown in table 1) is obtained by mixing conventional No. 70 asphalt and rock asphalt (the mass ratio of the asphalt to the rock asphalt is 100:11) by adopting a blending method, and 500 parts of the raw materials are obtained; 22.5 parts of polymer modifier 791SBS; 1 part of the macleaya cordata stabilizer; 10 parts of Mantex extender.
The preparation method comprises the following steps: adding a modifier and a ductility enhancer into low-grade asphalt No. 5, heating to 180 ℃, shearing for 1.0h at a shearing rate of 4500r/min by using a shearing machine, transferring to a constant-temperature heating sleeve after shearing is finished, adding a stabilizer, keeping the temperature at 177 ℃, stirring for 1.0h at a rotating speed of 800r/min, and transferring to a same-temperature oven for standing development/defoaming for 20min to obtain high-modulus asphalt No. 5 (indexes are shown in Table 2).
Test case
Table 1 tables of parameters for low grade bitumen in examples 1-2 and comparative examples 1-3
The performance of the high modulus modified asphalt samples of examples 1-2 and comparative examples 1-3 were tested according to the method prescribed by JTG E20-2011, highway engineering asphalt and asphalt mix test procedure, and U.S. Standard AASHTO M320-03, and the results are as follows:
table 2 Table of the results of the test of the high modulus modified asphalt in examples 1-2 and comparative examples 1-3
As can be seen from the above table, the high modulus asphalt (examples 1-2) prepared from the low grade asphalt having the performance parameters within the defined ranges of the present invention not only meets the requirements of Shandong province high modulus asphalt landmarks, but also has excellent high and low temperature performance, aging resistance and fatigue resistance, construction and dissimilarity, etc. Specifically, the low grade bitumen has the following performance parameters: the penetration at 25 ℃ is 30-50dmm, the softening point is 52-60 ℃, the colloid instability coefficient is not more than 45%, the kinematic viscosity at 135 ℃ is not more than 1.0 Pa.s, the solubility is not less than 99%, the penetration ratio is not less than 63%, and no skinning is caused after aging.
However, high modulus asphalt prepared using low grade asphalt whose performance parameters are outside the scope of the definition of the present invention has performance drawbacks: if the ductility after aging is poor, only 1cm, as in comparative example 2, the aging resistance is poor; there is also a problem that the modifier is not compatible with asphalt, as in comparative example 1, the modifier cannot form a uniform system with asphalt, and the function of the modifier cannot be effectively exerted. In addition, there is also a high temperature viscosity too high, such as comparative example 3, a viscosity of 175 ℃ reaching 1.5pa·s, and a high temperature viscosity too high, which is unfavorable for workability in construction.
The embodiments of the present invention have been described above by way of examples. However, the scope of protection of the present application is not limited to the above embodiments. Any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art, which fall within the spirit and principles of the present invention, are intended to be included within the scope of the present claims.
Claims (10)
1. A low grade asphalt having the following characteristics (a) and (b):
(a) The penetration at 25 ℃ is 30-50dmm;
(b) The softening point is 52-60 ℃;
and has one or more selected from the following features (c) to (g):
(c) The colloid instability coefficient is not more than 45%;
(d) A kinematic viscosity at 135 ℃ of not more than 1.0 Pa.s;
(e) The penetration ratio is not less than 63%;
(f) Solubility is not less than 99%;
(g) No crust after aging.
Preferably, the low grade bitumen has features (a) and (b), and two or more of (c) to (g). More preferably, the low grade bitumen has all of the features (a) to (g) above.
2. The low grade asphalt of claim 1, wherein:
the penetration at 25 ℃, the softening point, the kinematic viscosity at 135 ℃ and the solubility are detected by reference JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure;
the colloidal instability coefficient was detected as follows:
(1) The quality of asphaltene, saturated fraction, colloid and aromatic fraction is measured according to JTG E20-2011, highway engineering asphalt and asphalt mixture test procedure; and
(2) The colloid instability coefficient is calculated according to the following formula: colloid instability coefficient= (asphaltene+saturation fraction)/(colloid+aromatic fraction) mass ratio x 100%.
The judging standard of the state after aging is that a film oven test is finished according to a T0609-2011 test in JTG E20-2011 test procedure of Highway engineering asphalt and asphalt mixture, and a glass rod is used for picking up an asphalt sample in an aging disc to observe whether skinning exists or not.
3. The low grade asphalt of claim 1 or 2, wherein:
the penetration of the low-grade asphalt at 25 ℃ is 30-38dmm; and/or
The softening point of the low-grade asphalt is 52-56 ℃; and/or
The colloid instability coefficient of the low-grade asphalt is 40-45%; and/or
The kinematic viscosity of the low-grade asphalt at 135 ℃ is 0.6-0.8 Pa.s; and/or
The solubility of the low-grade asphalt is 99.0% -99.7%; and/or
The penetration ratio of the low grade bitumen is preferably 63% to 68%.
4. A method of screening low grade asphalt, wherein the method comprises detecting low grade asphalt and screening low grade asphalt having the features (a) and (b) of any one of claims 1 to 3, and one or more selected from the group consisting of features (c) to (g);
preferably, screening low grade bitumen having features (a) and (b), and two or more of (c) to (g); more preferably, the low-grade asphalt having all of the features (a) to (g) above is screened.
5. A mixture comprising the low grade asphalt of any one of claims 1-3.
6. The mixture of claim 5, wherein the mixture further comprises at least one of a polymer modifier, a stabilizer, a extender, preferably the mixture further comprises a polymer modifier, a stabilizer, and a extender.
7. Use of a low grade bitumen as claimed in any one of claims 1 to 3, a screening method as claimed in claim 4 or a mixture as claimed in claim 5 or 6 for the preparation of a high modulus bitumen.
8. A high modulus asphalt, wherein the high modulus asphalt comprises the mixture of claim 5 or 6;
preferably, the high modulus asphalt is prepared by treating the mixture described above under heating conditions.
9. The high modulus asphalt of claim 8, wherein the treatment under heating comprises at least one of shearing, development, defoaming, and the like; alternatively, the treatment under heating includes the steps of shearing, development, and defoaming.
10. Use of the high modulus asphalt of claim 8 or 9 in engineering materials, in particular pavement materials.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112852176A (en) * | 2021-04-06 | 2021-05-28 | 山东京博石油化工有限公司 | High-modulus asphalt and preparation method thereof |
| CN115160808A (en) * | 2022-08-04 | 2022-10-11 | 山东海韵沥青有限公司 | High-viscosity modified asphalt and preparation method thereof |
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| CN112852176A (en) * | 2021-04-06 | 2021-05-28 | 山东京博石油化工有限公司 | High-modulus asphalt and preparation method thereof |
| CN115160808A (en) * | 2022-08-04 | 2022-10-11 | 山东海韵沥青有限公司 | High-viscosity modified asphalt and preparation method thereof |
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