CN109593368B - Road asphalt modifier, modified road asphalt, preparation method of modified road asphalt and asphalt mixture - Google Patents
Road asphalt modifier, modified road asphalt, preparation method of modified road asphalt and asphalt mixture Download PDFInfo
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Classifications
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention relates to the field of direct coal liquefaction, and discloses a road asphalt modifier, modified road asphalt, a preparation method thereof and an asphalt mixture, wherein the content of heavy petroleum oil is 0.5-9.5 parts by weight relative to 100 parts by weight of direct coal liquefaction asphalt. The road asphalt modifier has lower cost; the modified road asphalt prepared by the road asphalt modifier has a softening point higher than 75 ℃, and is suitable for high-temperature environments in the south. The asphalt mixture prepared by the road asphalt modifier or the modified road asphalt has higher water stability and anti-rutting performance.
Description
Technical Field
The invention relates to the field of direct coal liquefaction, in particular to a road asphalt modifier and a preparation method thereof, modified road asphalt prepared from the road asphalt modifier and a preparation method thereof, and asphalt mixture containing the modified road asphalt or the road asphalt modifier.
Background
How to utilize the direct coal liquefaction residues (also called coal direct liquefaction asphalt) efficiently and reasonably is a bottleneck for restricting the development of the current direct coal liquefaction technology, and the economic and reasonable utilization technology for developing the direct coal liquefaction residues not only can fully utilize resources, avoid the waste of precious resources and reduce the influence on the environment, but also can effectively improve the economy of the direct coal liquefaction process and promote the development of the direct coal liquefaction technology.
Along with the development of highway traffic industry in China, particularly high-grade highways, the traffic mileage increases year by year, and the demand and quality requirements on road asphalt are gradually improved. In 2013, the consumption of road asphalt in China breaks through 2000 ten thousand tons, wherein the high-quality modified asphalt reaches 400 ten thousand tons, and the situation of continuous growth is also presented.
The direct coal liquefaction residue is used as a novel asphalt material, and after technical treatment, if the direct coal liquefaction residue can meet the standard requirement of modified road asphalt, the direct coal liquefaction residue has wide market and attractive cost advantages, so that the direct coal liquefaction residue can be effectively and reasonably utilized, and meanwhile, a novel material with high cost performance can be provided for the road industry.
CN1827697A discloses a road asphalt modifier and an application method thereof, the method directly mixes pulverized coal liquefaction residues with road asphalt in a weight ratio of 5-30% within the range of 100-250 ℃; the method for preparing the modified asphalt disclosed in CN101161778B is similar to CN1827697A, and the improvement point is only that the molten coal direct liquefaction residue is mixed with the matrix asphalt at the temperature of 150 ℃ and 280 ℃; CN101863637B discloses a road asphalt concrete admixture, which is prepared by adding a proper amount of plasticizer, rubber powder, coupling agent and dispersant into direct coal liquefaction residues, and then the admixture is used for replacing part of conventional matrix asphalt and is used for preparing asphalt concrete. Although the above patent documents all achieve the utilization of coal liquefaction residues, the utilization range of the modified asphalt is limited because the modified asphalt has a narrow utilization field, has low ductility at low temperature (5 ℃), has high brittleness at low temperature, cannot meet the standard requirements of the commonly used polymer modified asphalt I-C and I-D, and is difficult to meet the requirements of road construction.
CN104513488A discloses a road asphalt modifier containing coal direct liquefaction residues, modified road asphalt and a preparation method thereof, wherein the road asphalt modifier comprises the coal direct liquefaction residues, petroleum heavy oil and a polymer, the petroleum heavy oil and the polymer are pre-dissolved, then are fully mixed with the liquefaction residues at a temperature higher than the softening point of the residues to obtain the road asphalt modifier, and then are fully mixed with matrix asphalt at a low temperature to obtain the road modified road asphalt. The road modified road asphalt obtained by the method has the effect which can reach or exceed the modified road asphalt standard of Trinidad Lake Asphalt (TLA).
CN106032437A and CN106032438A respectively disclose a road asphalt modifier prepared from coal direct liquefaction residues, a modified road asphalt product and a preparation method thereof, wherein the preparation method comprises the following steps: heating the direct coal liquefaction residue at 350 ℃ for 5-90min at 180 ℃ in the presence of an oxidant or fly ash to obtain modified direct coal liquefaction residue, mixing the modified direct coal liquefaction residue with a mixture of cheap heavy oil and a polymer generated in petroleum refining to obtain a road asphalt modifier, and mixing the road asphalt modifier with matrix asphalt to obtain modified road asphalt. The modified road asphalt meets the technical indexes of SBS modified road asphalt I-C and I-D specified by JTG F40-2004 technical Specification for road asphalt pavement construction.
Although the technical schemes of the three patent documents can produce the modified road asphalt meeting the technical indexes of the industry, the schemes still have the following problems: 1) after the polymer is pre-dissolved in heavy oil, the viscosity of the system is large, the material conveying is difficult, and the large-scale production cannot be carried out; 2) the mixture of the polymer and the heavy oil component needs to be mixed at a temperature higher than the softening point of the coal direct liquefaction asphalt to prepare a modifier, the higher mixing temperature causes the degradation of polymer molecules, the effect exertion of the polymer is influenced, and the polymer can only be compensated by increasing the amount of the polymer, so that the cost is higher; 3) the excessive addition of heavy oil in the system causes the softening point of the modified asphalt to be lower (lower than 75 ℃), and the use of the modified asphalt in high-temperature regions in the south is influenced; 4) the pretreatment of the liquefaction residues with an oxidizing agent or fly ash increases process complexity and operating cost, and is not conducive to industrial production.
Therefore, there is still a need to develop a new modified road asphalt using coal directly liquefied asphalt as raw material and a preparation method thereof to solve the above problems.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a road asphalt modifier, modified road asphalt, a preparation method thereof and an asphalt mixture.
The inventor of the invention finds that the road asphalt modifier obtained by directly and uniformly mixing the coal directly liquefied asphalt with a small amount of petroleum heavy oil has the following advantages: the road asphalt modifier does not contain polymers, so that the viscosity of a mixed system is low, and the large-scale industrial production of the modifier is facilitated; in addition, the road asphalt modifier is beneficial to improving the softening point of the modified road asphalt, and the water stability and the rutting resistance of the asphalt mixture prepared by the road asphalt modifier or the modified road asphalt are also improved. The present invention has been made based on this finding.
According to a first aspect of the present invention, there is provided a road asphalt modifier comprising coal directly liquefied asphalt and petroleum heavy oil, the petroleum heavy oil being contained in an amount of 0.5 to 9.5 parts by weight relative to 100 parts by weight of the coal directly liquefied asphalt.
According to a second aspect of the present invention, there is provided a process for preparing the road asphalt modifier according to the first aspect of the present invention, the process comprising: and heating and melting the coal directly liquefied asphalt, preheating the heavy petroleum oil, uniformly stirring the two, and cooling to obtain the road asphalt modifier.
According to a third aspect of the present invention, there is provided a modified road asphalt comprising a base petroleum asphalt, a polymer and a road asphalt modifier, wherein the road asphalt modifier is the road asphalt modifier according to the first aspect of the present invention.
According to a fourth aspect of the present invention, there is provided a process for producing the modified road asphalt according to the third aspect of the present invention, which comprises: and uniformly stirring the matrix petroleum asphalt, the polymer and the road asphalt modifier at a temperature lower than the decomposition temperature of the polymer to obtain the modified road asphalt.
According to a fifth aspect of the present invention, there is provided an asphalt mixture comprising modified road asphalt and aggregate, wherein the modified road asphalt is the modified road asphalt of the third aspect of the present invention.
According to a sixth aspect of the present invention, there is provided another asphalt mixture comprising: base petroleum asphalt and/or polymer modified road asphalt, as well as road asphalt modifier and aggregate; wherein the road asphalt modifier is the road asphalt modifier of the first aspect of the invention.
The road asphalt modifier does not use polymers, so that the cost is lower; the modified road asphalt prepared by the road asphalt modifier has a softening point higher than 75 ℃, and is suitable for high-temperature environments in the south. The asphalt mixture prepared by the road asphalt modifier or the modified road asphalt has higher water stability and anti-rutting performance.
The preparation methods of the road asphalt modifier and the modified road asphalt do not comprise a step of pre-dissolving the polymer, so that the viscosity of a mixed system is relatively low, and the preparation method is suitable for large-scale production of the road asphalt modifier and the modified road asphalt. Preferably, the road asphalt modifier is carried out at the temperature higher than the softening point of the coal direct liquefaction asphalt, so that the uniform mixing of the heavy oil and the coal direct liquefaction asphalt can be further promoted; the preparation of the modified road asphalt is carried out at relatively low temperature, so that the problem that the polymer is decomposed due to overhigh temperature to influence the performance of the modified asphalt is avoided.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
According to a first aspect of the present invention, there is provided a road asphalt modifier comprising coal direct liquefaction asphalt and petroleum heavy oil.
According to the road asphalt modifier, the content of the petroleum heavy oil component is 0.5-9.5 parts by weight relative to 100 parts by weight of coal direct liquefaction asphalt.
The coal direct liquefaction asphalt can be coal direct liquefaction asphalt obtained by various coal direct liquefaction technologies. As is well known in the art, the coal direct liquefaction bitumen refers to a byproduct obtained after separation of liquefied oil in a coal liquefaction process, has a property similar to bitumen, is a black substance which is solid at normal temperature, and mainly comprises two parts of inorganic substances and organic substances, wherein the inorganic substances comprise mineral substances in coal and an additional catalyst, the additional catalyst is a magnetite-like sulfide and generally has a sulfur content of more than 1 wt% (based on the coal direct liquefaction bitumen), and the content of the inorganic substances accounts for about 10 to 20 wt% of the coal direct liquefaction bitumen; the organic matter comprises heavy liquefied oil, asphalt substances and unconverted coal, wherein the total content of the heavy liquefied oil and the asphalt substances accounts for 35-55 wt% of the coal direct liquefied asphalt, and the content of the unconverted coal accounts for 20-40 wt% of the coal direct liquefied asphalt. The softening point of the coal direct liquefaction asphalt is generally 130-200 ℃, and preferably 160-200 ℃.
The heavy oil content of the petroleum can be heavy and poor oil content generated in each link of petroleum production. TheseHeavy and poor oil contents lead to processing difficulties due to high viscosity and large asphaltene content. Generally, the content of heavy components with the distillation range of not less than 350 ℃ in the heavy petroleum oil is not less than 70 weight percent and the density at 20 ℃ is not less than 0.90g/cm based on the total weight of the heavy petroleum oil3The solidifying point (softening point) is not more than 40 ℃, and the kinematic viscosity at 100 ℃ is not more than 50mm2·s-1。
Preferably, the petroleum heavy oil is one or more than two of catalytic cracking slurry oil, hydrocracking tail oil, furfural refined extract oil, heavy deasphalted oil, delayed coking heavy distillate oil and vacuum residue.
In the road asphalt modifier of the present invention, the content of the petroleum heavy oil component is preferably 1 to 8 parts by weight based on 100 parts by weight of the coal-directly liquefied asphalt.
The road asphalt modifier does not contain a polymer, so that the problem of difficulty in material conveying caused by overlarge viscosity does not exist in the preparation of the road asphalt modifier, and the large-scale production of the road asphalt modifier can be realized.
According to a second aspect of the present invention, there is provided a process for preparing the road asphalt modifier according to the first aspect of the present invention, the process comprising: and heating and melting the coal directly liquefied asphalt, preheating the heavy petroleum oil, uniformly stirring the two, and cooling to obtain the road asphalt modifier.
According to the production method of the present invention, the heating and melting may be carried out at any temperature at which the coal directly liquefied asphalt is melted without causing a change in the asphalt properties thereof. From the viewpoint of shortening the stirring time and further reducing the viscosity of the system, the temperature for heating and melting is preferably 50 to 100 ℃ higher than the softening point of the coal-derived liquefied pitch.
According to the preparation method of the invention, the method preferably further comprises the step of crushing and drying the coal directly liquefied asphalt before heating and melting so that the particle size of the coal directly liquefied asphalt is not more than 3mm and the water content is less than 0.5 wt%.
Preferably, the preheating temperature is 150-170 ℃, so that the splashing of the heavy petroleum oil during stirring can be further avoided.
According to the preparation method of the present invention, the temperature of the stirring is generally lower than the heating melting temperature of the coal direct liquefaction pitch and higher than the softening point of the coal direct liquefaction pitch. Preferably, the temperature of the stirring is 200-280 ℃.
Since the road asphalt modifier is generally used for preparing modified road asphalt by mixing it with base petroleum asphalt in the form of particles having a particle size of not more than 5mm, the preparation method of the present invention preferably further comprises: the obtained road asphalt modifier is crushed or extruded for granulation to prepare particles with the particle size of not more than 5mm, preferably 0.1-4.5 mm.
The pulverization and the extrusion granulation can be carried out by adopting the method known in the field, and the details are not repeated.
According to a third aspect of the present invention, there is provided a modified road asphalt comprising a base petroleum asphalt, a polymer and a road asphalt modifier, wherein the road asphalt modifier is the road asphalt modifier according to the first aspect of the present invention.
In the modified road asphalt of the present invention, the road asphalt modifier is usually a granule having a particle size of not more than 5mm, preferably a granule having a particle size of 0.1 to 4.5 mm.
In the modified road asphalt of the present invention, the polymer may be a thermoplastic elastomer containing an unsaturated bond (e.g., a carbon-carbon double bond). Preferably, the polymer is one or more of styrene-butadiene-styrene block copolymer (SBS), styrene-butadiene rubber (SBR), ethylene-propylene-diene monomer rubber (EPDM), nitrile rubber (NBR), ethylene-acrylate terpolymer, polybutadiene rubber, polyisoprene rubber, styrene-isoprene-styrene block copolymer (SIS), and ethylene-octene block copolymer; more preferably, the polymer is one or more of styrene-butadiene-styrene block copolymer, ethylene propylene diene monomer rubber, and styrene butadiene rubber. The structure and composition of the above polymers are not particularly limited as long as the basic requirements for use as road asphalt modifying components well known to those skilled in the art are met, for example, SBS may be of linear or star type structure, block ratio (polystyrene/polybutadiene, i.e., S/B) is 30/70 or 40/60, elongation at break is greater than 500%, such as SBS1301, 1401, 4303, 4402, 4452 and other brands and their derivatives; the SBR can be styrene with the mass fraction of more than 23 percent and the molecular weight of 10-150 ten thousand, such as SBR1712, 1502, 1500 and other brands or SBR rubber powder (such as PSBR); SIS can be linear or star-shaped structure, the block ratio (polystyrene/polyisoprene, namely S/I) is 15-30/80-70, and the elongation at break is more than 900 percent, such as SIS1105, 1188, 1225, 1209, 1106 and other brands; the EPDM can be a terpolymer having an ethylene content greater than 40 wt%, such as EPDM3430 and the like.
Since the improvement of the present invention is mainly due to the road asphalt modifier, the base petroleum asphalt can be selected with reference to the prior art. Typically, the base petroleum asphalt is road petroleum asphalt meeting road traffic specifications (e.g., JTG F40-2004), such as selected from No. 50-110 petroleum asphalt. According to a preferred embodiment, the base petroleum asphalt is selected from the group consisting of 70# petroleum asphalt and/or 90# petroleum asphalt.
According to one embodiment, the road asphalt modifier is present in an amount of 3 to 25 wt% and the polymer is present in an amount of 2.5 to 5 wt%, based on the total weight of the modified road asphalt.
Preferably, the content of the road asphalt modifier is 5-20 wt% and the content of the polymer is 3-5 wt% based on the total weight of the modified road asphalt.
According to a fourth aspect of the present invention, there is provided a process for producing the modified road asphalt according to the third aspect of the present invention, which comprises: and uniformly stirring the matrix petroleum asphalt, the polymer and the road asphalt modifier at a temperature lower than the decomposition temperature of the polymer to obtain the modified road asphalt.
In the present invention, the decomposition temperature of the polymer means a temperature at which the molecular chain of the polymer starts to be broken.
According to the preparation method of the modified road asphalt, the stirring is preferably carried out in two stages, and the linear speed of the first-stage stirring is more than 15 m/s; the linear speed of the second stage stirring is 0.1-5 m/s.
The specific stirring time of the first stage may be determined according to the scale of implementation of the preparation method. The stirring time of the first stage may be controlled to 10-50min when the modified road asphalt is prepared in a small scale in a laboratory, for example, using a shear emulsifying machine, and may be controlled to 1min or less when the modified road asphalt is prepared industrially in a large scale continuous process, for example, using a colloid mill. The stirring time of the second stage may be determined according to the stirring time of the first stage, and is generally controlled to be 0.5 to 4 hours.
The modified road asphalt has a softening point higher than 75 ℃, can be used in high-temperature areas such as south and the like, and can improve the water stability and the rutting resistance of the asphalt mixture by taking the modified road asphalt as a raw material.
To this end, according to a fifth aspect of the present invention, there is provided an asphalt mixture comprising a modified road asphalt according to the second aspect of the present invention and an aggregate.
In the asphalt mixture according to the fifth aspect of the present invention, the content of the modified road asphalt may be selected according to the content of the road asphalt modifier, wherein the higher the content of the road asphalt modifier is, the less the content of the modified road asphalt is. Preferably, the content of the modified road asphalt is 3-6 wt% based on the total weight of the asphalt mixture.
In addition, the road asphalt modifier can also be directly used for preparing asphalt mixture, and can also improve the high-temperature stability and the anti-rutting property of the asphalt mixture.
To this end, according to a sixth aspect of the invention, there is provided another asphalt mixture comprising: base asphalt and/or polymer modified road asphalt, as well as road asphalt modifier and aggregate; the road asphalt modifier is the road asphalt modifier of the first aspect of the invention.
In the asphalt mixture according to the sixth aspect of the present invention, the content of the matrix petroleum asphalt and/or the polymer-modified road asphalt is preferably 3 to 6% by weight, and the content of the road asphalt modifier is preferably 0.3 to 1% by weight, and more preferably 0.4 to 0.8% by weight, based on the total weight of the asphalt mixture.
The polymer modified road asphalt comprises a polymer and a base petroleum asphalt. The polymer may be present in an amount of 2 to 10 wt%, based on the total weight of the polymer-modified road asphalt. The polymer, the matrix petroleum pitch, is as described in the third aspect of the invention and will not be described in detail herein.
The asphalt mixture according to the fifth and sixth aspects of the present invention may be prepared according to the technical requirements specified in the technical Specification for road asphalt pavement construction (JTG F40-2004). Generally, the heating temperature of the aggregate may be 170-210 ℃, the heating temperature of the asphalt (the general term of the modified road asphalt, the matrix petroleum asphalt and the polymer modified asphalt) may be 150-180 ℃, and the mixing time may be 5-20 seconds.
The present invention will be described in detail below by way of examples.
In the following examples and comparative examples,
the direct coal liquefaction asphalt with the softening point of 180 ℃ and the softening point of 200 ℃ is from Eldos division of oil production from Shenhua coal in China;
both the 70# and 90# petroleum asphalts are produced by asphalt plants of oil and petrochemical company in Qinhuang island;
SBS is produced by the petrochemical process of holy, the trade mark is SBS 1301;
the SBR is PSBR produced by Shandong Qianglong chemical engineering and technology Limited liability company;
the heavy petroleum oil A is catalytic cracking slurry oil produced by Yanshan petrochemical process, rho20℃0.985g/mL, 76 wt.% of fraction at a temperature above 350 ℃, 10.2 ℃ of condensation point and 14.78mm of kinematic viscosity at 100 ℃2·s-1：
The heavy petroleum oil component B is furfural extract oil produced by Yanshan petrochemical process, rho20℃0.989g/mL, 80 wt.% of fraction at a temperature above 350 ℃, 20 ℃ of condensation point and 35mm of kinematic viscosity at 100 ℃2·s-1；
The properties of the modified road asphalt adopt a standard method specified in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011); specifically, the softening point is measured by a T0606-2011 asphalt softening point test (ring and ball method), the penetration is measured by a T0604-2011 asphalt penetration test method, and the ductility is measured by a T0605-2011 asphalt ductility test method;
when testing the properties of the asphalt mixture, Marshall test pieces are prepared, and Marshall stability test, high-temperature stability test (rutting test), freeze-thaw splitting test and the like are carried out according to the regulations in technical Specifications for road asphalt pavement construction (JTG F40-2004) and test regulations for road engineering asphalt and asphalt mixtures (JTG E20-2011).
Example 1
(1) Preparation of road asphalt modifier
The coal direct liquefaction asphalt (the softening point is 180 ℃) is crushed and dried to obtain coal direct liquefaction asphalt powder with the grain diameter of less than 3mm and the moisture content of less than 0.5 weight percent. Heating the powder to 250 ℃ for melting, simultaneously preheating the heavy petroleum oil A to 180 ℃, then mixing the two components at 230 ℃ according to the weight ratio of 100: 8, uniformly stirring, cooling, and crushing into particles smaller than 5mm to obtain the road asphalt modifier.
(2) Preparation of modified road asphalt
The road asphalt modifier is mixed with 15 wt% and 4 wt% of SBS1301 and 81 wt% of No. 90 petroleum asphalt, and is sheared at 150 deg.C in a shearing emulsifying machine at a high speed of 30m/s for 30 minutes, and then is stirred for 1 hour at a linear speed of 1m/s to obtain the modified road asphalt, and the properties of the product are shown in Table 3.
(3) Preparation of asphalt mixture
The AC-13C asphalt mixture is prepared according to the regulations of the technical Specification for road asphalt pavement construction (JTG F40-2004). And (2) selecting the AC-13C grade, respectively heating the modified road asphalt and mineral aggregate, and uniformly mixing according to the weight ratio of 4.9: 95.1 to obtain an asphalt mixture. Wherein the gradation of the used mineral aggregate is shown in table 1, and the heating temperature of the material and the compaction temperature of the asphalt mixture are shown in table 2; the properties of the asphalt mixture are shown in table 4.
TABLE 1 gradation of mineral aggregates
TABLE 2 operating temperatures of the materials
| Heating temperature of mineral aggregate | 175～185℃ |
| Temperature of asphalt heating | 160～170℃ |
| Compaction temperature of asphalt mixture | 160～165℃ |
Example 2
(1) Preparation of road asphalt modifier
The coal direct liquefaction asphalt (the softening point is 200 ℃) is crushed and dried to obtain coal direct liquefaction asphalt powder with the grain diameter of less than 3mm and the moisture content of less than 0.5 weight percent. Heating the powder to 280 ℃ for melting, simultaneously preheating the heavy petroleum oil A to 180 ℃, then mixing the two components at 230 ℃ according to the weight ratio of 100: 1, uniformly stirring, cooling, and crushing into particles smaller than 5mm to obtain the road asphalt modifier.
(2) Preparation of modified road asphalt
The road asphalt modifier is mixed with 20 wt% and 3.8 wt% of SBS1301 and 76.2 wt% of No. 70 petroleum asphalt, and is sheared at 170 ℃ for 35 minutes at a high speed of 25m/s, and then is stirred for 0.5 hour at a linear speed of 1m/s to obtain the modified road asphalt, wherein the properties of the product are shown in Table 3.
(3) Preparation of road asphalt mixture
An asphalt mixture was prepared according to the method of example 1, and the properties thereof are shown in Table 4.
Example 3
(1) Preparation of road asphalt modifier
The coal direct liquefaction asphalt (the softening point is 200 ℃) is crushed and dried to obtain coal direct liquefaction asphalt powder with the grain diameter of less than 3mm and the moisture content of less than 0.5 weight percent. Heating the powder to 280 ℃ for melting, simultaneously preheating the heavy petroleum oil B to 180 ℃, then mixing the two components at 250 ℃ according to the weight ratio of 100: 9.5, uniformly stirring, cooling, and crushing into particles smaller than 5mm to obtain the road asphalt modifier.
(2) Preparation of modified road asphalt
The road asphalt modifier is mixed with SBS1301 of 5 wt% and SBS 3 wt% and 90# petroleum asphalt of 92 wt%, and is sheared at 170 deg.c for 40 min at the linear speed of 20m/s and then stirred for 0.5 hr at the linear speed of 1m/s in shearing emulsifying machine to obtain modified road asphalt with the performance shown in Table 3.
(3) Preparation of road asphalt mixture
An asphalt mixture was prepared according to the method of example 1, and the properties thereof are shown in Table 4.
Example 4
(1) Preparation of road asphalt modifier
The coal direct liquefaction asphalt (the softening point is 180 ℃) is crushed and dried to obtain coal direct liquefaction asphalt powder with the grain diameter of less than 3mm and the moisture content of less than 0.5 weight percent. Heating the powder to 250 ℃ for melting, simultaneously preheating the heavy petroleum oil A to 170 ℃, then mixing the two components at 230 ℃ according to the weight ratio of 100: 7, uniformly stirring, cooling, and crushing into particles smaller than 5mm to obtain the road asphalt modifier.
(2) Preparation of modified road asphalt
The road asphalt modifier is mixed with 7 wt% and 5 wt% of PSBR and 88 wt% of No. 90 petroleum asphalt, and is sheared at 160 ℃ for 45 minutes at a high speed with a linear velocity of 15m/s, and then is stirred for 2 hours at a linear velocity of 2m/s in a shearing emulsifying machine to obtain the modified road asphalt, wherein the properties of the product are shown in Table 3.
(3) Preparation of road asphalt mixture
An asphalt mixture was prepared according to the method of example 1, and the properties thereof are shown in Table 4.
Comparative example 1
The properties of the 70# petroleum asphalt were measured and the results are shown in table 3, and an asphalt mixture was prepared using the 70# petroleum asphalt according to the method of example 1 and the results are shown in table 4.
Comparative example 2
Modified road asphalt and asphalt mixture were prepared according to the method of example 1, except that in the preparation of the modified road asphalt, 4 wt% of SBS1301 and 96 wt% of No. 90 petroleum asphalt were used to prepare polymer modified road asphalt without adding a road asphalt modifier, and the properties of the polymer modified road asphalt and the prepared asphalt mixture are shown in tables 3 and 4, respectively.
Comparative example 3
(1) Preparation of road asphalt modifier
A road asphalt modifier was prepared by following the procedure of example 1, except that the weight ratio of the coal directly liquefied asphalt to the petroleum heavy oil component A was adjusted to 100: 12, thereby preparing a road asphalt modifier.
(2) Preparation of modified road asphalt
Modified road asphalt was prepared according to the method of example 1, and its properties are shown in Table 3.
(3) Preparation of asphalt mixture
An asphalt mixture was prepared according to the method of example 1, and its properties are shown in table 4.
TABLE 3 Properties of modified road asphalt
TABLE 4 Properties of the asphalt mixture
The data in table 3 show that the modified road asphalt prepared by the road asphalt modifier of the invention has a higher softening point, and the results in table 4 show that the asphalt mixture prepared by the modified road asphalt of the invention meets the technical requirements specified in technical Specification for road asphalt pavement construction (JTG F40-2004), and has higher high-temperature rutting resistance and water stability.
Example 5
(1) Preparation of road asphalt modifier
The preparation method is the same as example 1.
(2) Preparation of asphalt mixture
The AC-20C asphalt mixture is prepared according to the regulations of the technical Specification for road asphalt pavement construction (JTG F40-2004). The road asphalt modifier is evenly mixed with 90# petroleum asphalt and mineral aggregate according to the weight ratio of 0.4: 4.3: 95.3 by selecting the AC-20 gradation to obtain the asphalt mixture. Wherein the gradation of the mineral aggregate is shown in table 5, and the heating temperature of the material and the compacting temperature of the asphalt mixture are shown in table 6; the properties of the asphalt mixture are shown in table 7.
TABLE 5 gradation of mineral aggregates
TABLE 6 operating temperatures of the materials
| Heating temperature of mineral aggregate | 175～185℃ |
| Temperature of asphalt heating | 160～170℃ |
| Compaction temperature of asphalt mixture | 160～165℃ |
Example 6
(1) Preparation of road asphalt modifier
The preparation method is the same as example 1.
(2) Preparation of asphalt mixture
According to the preparation method of example 5, the road asphalt modifier, the polymer modified road asphalt (prepared in comparative example 2) and the mineral aggregate are uniformly mixed according to the weight ratio of 0.7: 4.3: 95 to obtain the asphalt mixture, and the properties of the asphalt mixture are shown in Table 7.
Comparative example 4
According to the preparation method of example 5, 90# petroleum asphalt and mineral aggregate are uniformly mixed according to the weight ratio of 4.3: 95.7, and then the asphalt mixture is obtained, wherein the properties of the asphalt mixture are shown in Table 7.
Comparative example 5
According to the preparation method of example 5, the polymer modified road asphalt (prepared in comparative example 2) and the mineral aggregate were uniformly mixed in a weight ratio of 4.3: 95.7 to obtain an asphalt mixture, and the properties thereof are shown in Table 7.
TABLE 7 Properties of the asphalt mixture
As can be seen from Table 7, the asphalt mixture prepared by directly mixing the road asphalt modifier of the invention with aggregate and matrix petroleum asphalt meets the technical requirements specified in technical Specification for road asphalt pavement construction (JTG F40-2004), and the obtained asphalt mixture has higher high-temperature rutting resistance and water stability.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (12)
1. A modified road asphalt contains matrix petroleum asphalt, polymer and a road asphalt modifier, and is characterized in that,
the road asphalt modifier consists of coal directly liquefied asphalt and petroleum heavy oil, wherein the content of the petroleum heavy oil is 1-8 parts by weight relative to 100 parts by weight of the coal directly liquefied asphalt;
the road asphalt modifier is prepared by the following method: heating and melting the coal directly liquefied asphalt, preheating the heavy petroleum oil, uniformly stirring the two, and cooling to obtain a road asphalt modifier; wherein the heating and melting temperature is 50-100 ℃ higher than the softening point of the coal direct liquefaction asphalt, and the stirring temperature is lower than the heating and melting temperature of the coal direct liquefaction asphalt and higher than the softening point of the coal direct liquefaction asphalt; before heating and melting, crushing and drying the coal directly liquefied asphalt to ensure that the particle size of the coal directly liquefied asphalt is not more than 3mm, and the water content is below 0.5 weight percent.
2. The modified road asphalt as claimed in claim 1, wherein the softening point of the coal direct liquefaction asphalt is 130-200 ℃.
3. The modified road asphalt of claim 1, wherein the petroleum heavy oil is one or more of a catalytic cracking slurry oil, a hydrocracking tail oil, a furfural refined extract oil, a heavy deasphalted oil, a delayed coking heavy distillate oil, and a vacuum residue.
4. The modified road asphalt of claim 1, wherein the temperature of the heating and melting is 50-100 ℃ higher than the softening point of the coal direct liquefaction asphalt.
5. The modified road asphalt as claimed in claim 1, wherein the preheating temperature is 150-170 ℃.
6. The modified road asphalt as claimed in claim 1, wherein the stirring temperature is 200-280 ℃.
7. The modified road asphalt of any one of claims 1 to 6, wherein the road asphalt modifier is present in an amount of 3 to 25 wt% and the polymer is present in an amount of 2.5 to 5 wt%, based on the total weight of the modified road asphalt.
8. The modified road asphalt of claim 7, wherein the polymer is one or more of styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, ethylene-propylene-diene rubber, nitrile rubber, ethylene-acrylate terpolymer, polybutadiene rubber, polyisoprene rubber, styrene-isoprene-styrene block copolymer, and ethylene-octene block copolymer.
9. A process for producing the modified road asphalt of any one of claims 1 to 8, which comprises: and uniformly stirring the matrix petroleum asphalt, the polymer and the road asphalt modifier at a temperature lower than the decomposition temperature of the polymer to obtain the modified road asphalt.
10. The method of claim 9, wherein the stirring is carried out in two stages, the linear velocity of the first stage stirring being greater than 15 m/s; the linear speed of the second stage stirring is 0.1-5 m/s.
11. An asphalt mixture comprising a modified road asphalt and an aggregate, wherein the modified road asphalt is the modified road asphalt of any one of claims 1 to 8.
12. The asphalt mixture according to claim 11, wherein the modified road asphalt is present in an amount of 3-6 wt% based on the total weight of the asphalt mixture.
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