CN116023791A - SBS modified asphalt cement particles, and preparation method and application thereof - Google Patents
SBS modified asphalt cement particles, and preparation method and application thereof Download PDFInfo
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to SBS modified asphalt cement particles, a preparation method and application thereof, wherein the SBS modified asphalt cement particles comprise SBS modified asphalt and filler; in the SBS modified asphalt cement particles, the weight content of the SBS modified asphalt is 40-80%, and the weight content of the filler is 20-60%. The SBS modified asphalt cement particles can replace asphalt partially or completely, can be directly put into asphalt mixture mixing equipment, and can be used for preparing asphalt mixtures by rapid dispersion, and can be used for repairing new high-grade asphalt roads, road construction in remote areas or maintenance and upgrading of old roads and pits. Compared with the traditional production mode of asphalt mixture, the invention has the characteristics of convenient and flexible use, high mixing and dispersing efficiency and the like, and solves the problems of difficult asphalt transportation, energy waste caused by repeated heating, easy aging and the like.
Description
Technical Field
The invention belongs to the technical field of road modified asphalt preparation and application, and particularly relates to SBS modified asphalt cement particles and a preparation method and application thereof.
Background
As a continuous seamless pavement, the asphalt pavement has the characteristics of comfortable shock absorption and easy maintenance, and is widely applied to paving and maintenance of roads of various grades. As the most important binding material in the road, asphalt, stone and mineral powder have good binding effect, so that the pavement has good bearing capacity and waterproof performance. However, common asphalt is easy to generate rutting at high temperature, easy to crack at low temperature, easy to generate water damage and holes, and easy to age, and generally needs to be repaired, renovated and the like after 5 years. Along with the increase of traffic volume and traffic load, more severe requirements are put on road paving asphalt materials, and SBS (styrene-butadiene-styrene triblock copolymer) modified asphalt is often adopted to remarkably improve the road surface quality and prolong the service life, so that the SBS modified asphalt road surface needs to be frequently maintained after 8 years.
Asphalt is a semi-solid substance that is easily adhered above room temperature, making it difficult to transport and use. The asphalt is required to be heated into a liquid flowing state for transportation, a special asphalt special vehicle is required during transportation, and the asphalt is required to be kept in a heating state during use, so that the asphalt is suitable for large-scale construction and is not suitable for being used in cold winter. This aspect results in high logistic costs and also in energy waste, construction season restrictions. Particularly in the western vast areas of China, the problems of transportation and heating use are very prominent. Due to the arrival of asphalt pavement maintenance, small-scale and customized construction scenes are more and more, asphalt materials are required to be easy to transport, and different traffic and climate conditions are convenient to modify and adapt, which contradicts the current situation of mass production and transportation of modified asphalt. If the modified asphalt particles are processed into the modified asphalt particles in a concentrated way in advance, the modified asphalt particles are convenient to transport, flexible to use and beneficial to solving the dilemma.
The modified asphalt comprises two processing modes of a wet method and a dry method, the traditional production mode of the hot-mix asphalt mixture is a wet method, aggregate is heated and then conveyed into mixing equipment, and then hot modified asphalt is sprayed into the mixing equipment for mixing, so that the method is suitable for paving a large amount of pavement on a large scale. The dry direct-throwing type modified asphalt particles are used in a mode that the modifier or modified asphalt particles are added into a mixing device and directly melted and mixed by using hot stone, so that on one hand, the asphalt particles can be transported in a solid state and directly thrown into a processing asphalt mixture, and on the other hand, the asphalt particles are flexibly used and are suitable for repairing construction in a small quantity, remote areas or winter, and the like, and therefore, the asphalt or modified asphalt is prepared into asphalt particles with great significance.
The preparation process of the modified asphalt direct-injection particles generally comprises three processes, namely, the preparation of the modified asphalt into particles, and the isolation of the modified asphalt particles to prevent the adhesion in the storage, transportation and use processes. It is also sometimes the case that the process of preparing the particles and isolating the release is completed. There have been patent reports mainly focused on how to keep asphalt particles from binding during storage and transportation.
The granule forming method mainly comprises spray cooling forming, stirring, cooling, directly crushing, coating, directly granulating by drum type back-rotation cooling steel belt, extruding by screw, and granulating in water. US patent 4931231 proposes a spray-cooled granulation process. US7101499 proposes the use of a water gun to cut the flowing hot asphalt into granules. Earlier natural asphalt (such as lake asphalt) was heated and flowed directly or indirectly with steam, and was cooled in a drum type to be formed into a block, cake or granule. The US patent 6679941 has earlier proposed a method of water-cooled granulation after extrusion by an extruder, but the viscosity of the water-granulated material, the method, etc. are not described in detail. Recently, U.S. Pat. No. 5, 9382423 describes in detail the apparatus and process of granulating various modified asphalt in the extrusion water. The screw extrusion has strong continuity and better granulating effect in water, but has the defects of large investment and higher granulating cost. The direct granulation of cooled revolving steel belts requires that the modified asphalt has good fluidity and less impurities, for example, hard asphalt particles are often prepared in this way. The modified asphalt is easy to be crushed directly by stirring and cooling, and is subjected to isolated coating and crushing into particles after being cooled.
In addition, there are various patents describing different methods how to make the modified asphalt particles not cold flow and bond during storage and transportation, thereby facilitating the later use of the modified asphalt particles. More focusing on the method of spraying particles and coating, the requirement on equipment is higher. To prevent the modifier particles from sticking to the blade edges during the dicing process and from hardening to each other during storage, some release agent is also added. The release agent comprises inorganic release agent such as calcium carbonate, magnesium carbonate, calcium sulfate, aluminum hydroxide, zinc oxide, pulvis Talci, etc.; organic release agents such as higher fatty acid amides, higher fatty acid salts, alginates, polyolefins, and the like. There are also patents which propose methods of isolation using residual moisture directly. US4769288 uses a method of coating the surface with sulfur or a polymer emulsion and coating with mineral powder. And the prepared modified asphalt particles are quickly coated by forming shells in liquid sulfur. US5688449 proposes the use of curable coating isolation. US3026568 describes a method of upwardly spraying powder material, such as lime powder and cement, in downwardly spraying flowing hot asphalt particles. US patent 4028454 reports a method of isolating asphalt particles using geotechnical fibers.
For modified asphalt particles, CN108795075a proposed modified asphalt with plant fiber powder and mineral powder to increase the solidification degree of asphalt, preparing rubber asphalt and granulating by rotating steel belts, but there is no mention of the SBS modified asphalt preparation method and the conventional SBS modified asphalt storage problem, and the difficulty caused by adding a solidifying agent to the modified asphalt is not considered. CN1051761071a discloses a modified asphalt particle and a preparation method thereof, relates to asphalt, a modifier, a forming agent and the like, and emphasizes the use of nano mineral powder and the like, wherein the modifier particle has the problems of various additive types, high manufacturing cost, ambiguous use purpose and the like. CN105585861a proposes a method for using high softening point asphalt as plugging agent in oil field by crushing into particles. CN201510564085.0 proposes a method for preparing modified asphalt particles by using waste clothing fibers, which is beneficial to improving the mixing uniformity of short fibers and asphalt and also prevents adhesion of asphalt particles. CN201320799886.1 proposes a method for manufacturing bio-asphalt particles from vegetable asphalt and lignin by special processing equipment. CN201410629874.3 modified asphalt cement particles, a preparation method and application thereof, and discloses waste plastics and waste rubber modified asphalt, but the raw materials of the modified asphalt are changeable, the processing technology is complex, the performance of the prepared modified asphalt is difficult to guarantee, and the standard requirements of SBS modified asphalt widely used in the current market are not met.
It is not difficult to find from the reports of the above patent documents that the preparation of asphalt particles is mainly focused on the preparation method and isolation measures of the particles, although the preparation and application of SBS modified asphalt cement particles are very few, and the preparation, composition, isolation and use methods of the SBS modified asphalt particles are not described. The SBS modified asphalt is widely used at present. Meanwhile, road construction in China is developing towards remote areas, maintenance markets are rapidly developing, and SBS modified asphalt particles which are easy to transport, construct and customize are continued.
Disclosure of Invention
The invention mainly aims to provide SBS modified asphalt cement particles and a preparation method and application thereof, so as to solve the problems that the traditional modified asphalt in the prior art is difficult to process, inconvenient to transport, unsuitable for maintenance or construction in remote areas and the like.
In order to achieve the above object, the present invention provides an SBS modified asphalt cement particle comprising SBS modified asphalt and a filler; in the SBS modified asphalt cement particles, the weight content of the SBS modified asphalt is 40-80%, and the weight content of the filler is 20-60%.
The SBS modified asphalt cement particles provided by the invention further comprise a dispersing agent, wherein the dispersing agent accounts for 1-5% of the weight of the SBS modified asphalt cement particles, and the sum of the weight contents of the SBS modified asphalt, the filler and the dispersing agent is not more than 100%.
The SBS modified asphalt cement particles comprise 6-20% of SBS in the SBS modified asphalt; the SBS is linear or star-shaped SBS, and the number average molecular weight of the SBS is 6-30 ten thousand g/mol.
The SBS modified asphalt cement particles are characterized in that the dispersing agent is at least one of stearate, fischer-Tropsch wax and microcrystalline wax.
The SBS modified asphalt cement particles comprise mineral powder as filler, wherein the mineral powder comprises calcium carbonate, calcium oxide and slaked lime or a combination thereof; the particle size of the mineral powder is less than 75 microns.
The SBS modified asphalt cement particles are 2-10mm in size.
In order to achieve the above purpose, the invention also provides a preparation method of the SBS modified asphalt cement particles, which comprises the following steps:
step 1, kneading SBS modified asphalt and part of filler, and then carrying out melt extrusion, wherein the kneading temperature is 100-150 ℃;
and step 2, granulating the molten extrudate, and isolating the obtained granules by using residual fillers to obtain SBS modified asphalt cement particles.
The preparation method of the SBS modified asphalt cement particles comprises the step of modifying matrix asphalt by SBS, wherein the matrix asphalt is heavy cross asphalt, and the label range of the matrix asphalt is 50-110#.
The preparation method of the SBS modified asphalt cement particles comprises the step of adding the partial filler accounting for 20-60% of the total addition of the partial filler and the residual filler.
In order to achieve the above purpose, the invention further provides application of the SBS modified asphalt cement particles in preparing asphalt mixtures.
The invention has the beneficial effects that:
the SBS modified asphalt is prepared into particles, and the particles can be directly added into a mixing device to be melted and mixed by using hot stone, so that on one hand, solid transportation of asphalt can be realized, and the solid asphalt can be directly put into a processed asphalt mixture, and on the other hand, flexible use can be realized, and the method is suitable for repairing construction in a small amount, remote areas or winter.
The SBS modified asphalt particles are easy to granulate, are not adhered to form clusters after granulation, are easy to store and transport, have high dispersion efficiency when being mixed with aggregate in a hot mode, and have good performances.
Drawings
FIG. 1 is a flow chart of the preparation of SBS modified asphalt cement particles and the preparation process of the SBS modified asphalt cement particles for modified asphalt mixtures.
Detailed Description
The following describes the present invention in detail, and the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation and process are given, but the scope of protection of the present invention is not limited to the following examples, in which the experimental methods of specific conditions are not noted, and generally according to conventional conditions.
The invention provides SBS modified asphalt cement particles, which comprise SBS modified asphalt and filler; in the SBS modified asphalt cement particles, the weight content of the SBS modified asphalt is 40-80%, and the weight content of the filler is 20-60%.
In one embodiment, the SBS modified asphalt of the present invention is obtained by modifying a matrix asphalt with SBS, wherein SBS is a styrene-butadiene-styrene triblock copolymer.
In one embodiment, the matrix asphalt of the present invention is a heavy-duty asphalt, the heavy-duty asphalt having a designation in the range of 70 to 110. Asphalt is marked by penetration, and heavy-traffic asphalt is divided into 50# asphalt, 70# asphalt, 90# asphalt, 100# asphalt and 110# asphalt. The asphalt grade is selected by considering road grade, climate condition, traffic condition, road surface type, etc. the softening point of 50# asphalt and the softening point of 70-110# asphalt are different, but the ductility is far less than 70-110# asphalt under the same temperature condition, so the 70-110# heavy traffic asphalt is preferable.
The mass content of SBS in the SBS modified asphalt is 3-5%, but the SBS modified asphalt is difficult to granulate at the mass content, and is easy to adhere after granulating and difficult to store. If the SBS content is too high, exceeding 20%, the SBS modified asphalt is difficult to process, and at the same time the viscosity of the modified asphalt is too great, making it difficult to disperse the modified asphalt in the asphalt mixture. Thus, in one embodiment, the SBS modified asphalt of the present invention has a mass content of SBS of 6-20%.
Similarly, the weight content of the filler in the SBS modified asphalt cement particles is preferably 20-60%, when the weight content is more than 60%, the cost is high, the particles are difficult to disperse, when the weight content is less than 20%, the particles are easy to adhere, and when the SBS content in the SBS modified asphalt is low, the filler content can be properly increased so as to prevent the particles from adhering. When the SBS modified asphalt is used, the lightweight components of the SBS absorbing asphalt are swelled and mixed, so that on one hand, the flowable lightweight components in the asphalt are obviously reduced, the asphalt is easy to granulate and use, and on the other hand, the combination of the asphalt and SBS is enhanced.
In one embodiment, the SBS used for modifying asphalt of the invention is linear or star-shaped SBS, and the number average molecular weight is 6 ten thousand-30 ten thousand g/mol. If the molecular weight of SBS is too high, kneading and melt mixing with asphalt are difficult, interaction between SBS and asphalt is slow, and dispersion is difficult; if the molecular weight of SBS is too small, the asphalt modification effect is poor, and the modification cost is too high. The SBS modified asphalt is processed by a colloid mill or a high-speed shearing machine at the processing temperature of 160-180 ℃. Above this temperature, not only is processing difficult, but SBS and bitumen are susceptible to degradation and aging.
In one embodiment, the filler of the present invention is an inorganic material, such as mineral powder, and the main component is calcium carbonate, calcium oxide, slaked lime or a combination thereof, which is alkaline to increase the binding with SBS modified asphalt. The filler added in the invention has two obvious effects, firstly, the rheological property of the SBS modified asphalt particles is reduced, the stiffness is increased, the particles are prevented from being adhered in the using process, the transportation is easy, and the use is convenient; secondly, the step of adding mineral powder into the asphalt mixture can be omitted by pre-dispersing the mineral powder into the SBS modified asphalt matrix, and compared with the step of adding the mineral powder into the asphalt mixture, the method can enhance the combination of the mineral powder, asphalt and SBS, and is beneficial to improving the performance of the asphalt mixture.
In one embodiment, the filler of the present invention has a particle size of less than 75 microns and meets the filler requirements of industrial composite asphalt mixtures.
In one embodiment, the SBS modified asphalt cement particles of the invention further comprise a dispersing agent, wherein the dispersing agent accounts for 1-5% of the weight of the SBS modified asphalt cement particles, and the sum of the weight contents of the SBS modified asphalt, the filler and the dispersing agent is not more than 100%. In another embodiment, the dispersant of the present invention is at least one of stearate, fischer-Tropsch wax, microcrystalline wax.
In one embodiment, the SBS modified asphalt cement particles of the present invention have a size of 2-10mm.
As shown in FIG. 1, the invention also provides a preparation method of the SBS modified asphalt cement particles, which comprises the following steps:
step 1, kneading SBS modified asphalt and part of filler, and then carrying out melt extrusion, wherein the kneading temperature is 100-150 ℃;
and step 2, granulating the molten extrudate, and isolating the obtained granules by using residual fillers to obtain SBS modified asphalt cement particles.
In one embodiment, the partial filler is added in an amount of 20-60% of the total addition of the partial filler and the remaining filler.
In one embodiment, the SBS modified asphalt and part of the filler are mixed and kneaded together with a dispersing agent, wherein the dispersing agent accounts for 1-5% of the weight of the SBS modified asphalt cement particles. In another embodiment, the dispersant of the present invention is at least one of stearate, fischer-Tropsch wax, microcrystalline wax.
In one embodiment, the preparation method of the SBS modified asphalt cement particles comprises the following steps:
step A, pre-preparing SBS modified asphalt, then sending the SBS modified asphalt and filler with the weight percentage being defined as above into kneading and mixing equipment, fully mixing and kneading the mixture at the temperature range of 100-150 ℃, and then conveying the mixture to a screw extruder through a screw to extrude a molten mixture;
and B, conveying the molten mixture obtained in the step A into water granulation equipment, cooling and granulating to obtain SBS modified asphalt cement particles, and isolating the particles after cooling to obtain storable modified asphalt cement particles. The particle size is 2-5mm, the powder comprises calcium carbonate, calcium oxide, slaked lime, talcum powder and the like, and can also be the filler, and the particle size of the powder is less than 75 microns.
In the preparation process of SBS modified asphalt cement particles, a method of blending and granulating in water by a kneader is adopted, wherein kneading and mixing equipment can be equipment consisting of a mixing chamber and a pair of rotors, and the equipment is provided with a heating temperature control device, and a screw extruder and a water cooling device are arranged at the lower part of the equipment. The underwater granulating equipment is composed of a single screw rod for stably conveying materials, and a machine head is a granulating device buried in water.
The invention also provides application of the SBS modified asphalt cement particles in preparation of asphalt mixtures. The invention is not particularly limited to a preparation method of the asphalt mixture, and the SBS modified asphalt cement particles of the invention can be used for partially or completely replacing common asphalt and directly put into an asphalt mixture stirring device to be melted and stirred by utilizing hot aggregate to obtain the modified asphalt mixture.
The SBS modified asphalt cement particles are not agglomerated, are convenient to transport, can partially or fully replace asphalt, can be directly put into an asphalt mixture stirring device, and are quickly melted and dispersed in the asphalt mixture.
In summary, the invention provides SBS modified asphalt cement particles, and a preparation method and application thereof. The modified cement particles in the invention can partially or completely replace common asphalt, and can be directly put into an asphalt mixture mixing pot to be mixed with hot aggregate, and the modified asphalt mixture can be prepared in a short time by utilizing shearing force generated in the mixing process of the hot aggregate. The prepared asphalt mixture has the advantages of good high and low temperature performance, stable structure, difficult segregation, simple preparation method, low cost, convenient transportation and use and the like.
Compared with the prior art, the SBS modified asphalt cement particles prepared by the invention have physical properties which meet and exceed the performance index of road asphalt mixture specified in China, are suitable for large-scale production and application, and have the following technical effects:
(1) The SBS modified asphalt cement particles are directly mixed with the aggregate, so that the problem of repeated heat storage of SBS modified asphalt is not considered, the segregation problem of SBS modified asphalt is reduced, and the problem of compatibility and selection is reduced.
(2) The SBS modified asphalt has small particle size, can be rapidly dispersed when being mixed with the aggregate under the action of the dispersing agent, and has higher mixing efficiency.
(3) The SBS modified asphalt cement particles prepared by the method are simple and easy to realize, are not adhered and are easy to store in a solid state. No extra modified asphalt equipment is needed, no special equipment such as an asphalt tank, a conveying pipeline and the like is needed, the transportation and the use are convenient, and the problem of asphalt storage in the construction process is avoided.
(4) According to the invention, SBS, asphalt and the like are co-refined to prepare modified asphalt, so that SBS modified asphalt cement particles are prepared and directly mixed in an asphalt mixture mixing pot, the use is convenient, the problems of repeated heating and transportation of asphalt are overcome, the bottleneck problem of unstable SBS modified asphalt is solved, the energy consumption is reduced, and the secondary pollution in the process of modifying asphalt by using SBS materials is reduced.
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The technical scheme of the invention is further described in detail through specific examples.
Example 1
Step A: SBS modified asphalt with the mass content of 6% is prepared in advance (the performance is shown in table 2), 40kg of SBS modified asphalt with the mass content of 6% is pumped into a 200L kneading internal mixer at 180 ℃ and 60kg of mineral powder is added, and the mixture is blended to prepare SBS asphalt cement particles, wherein the kneading temperature is 120 ℃, the rotating speed is 30r/min, and the time is 6min. After mixing, the mixture is extruded by a spiral discharging and single screw, the SBS modified asphalt cement particles are obtained through granulation by an underwater granulator, and then calcium carbonate powder accounting for 1% of the mass of the SBS modified asphalt cement particles is mixed for isolation, wherein the properties of the obtained SBS modified asphalt cement particles are shown in Table 2.
And (B) step (B): according to the mass percentage, 12.5% of SBS modified asphalt cement particles are added into 87.5% of mixture OGFC-13, the mixture is stirred for 3 minutes in a room at 180 ℃, then a test piece of modified asphalt mixture is prepared, and the performance of the mixture is tested after 48 hours of curing at room temperature. The prepared SBS modified asphalt mixture is numbered 1, and the performances are shown in Table 3.
Example 2
Step A: SBS modified asphalt with the mass content of 12% is prepared in advance (the performance is shown in table 2), 50kg of SBS modified asphalt with the mass content of 12% is pumped into a 200L kneading internal mixer at 180 ℃, 45kg of mineral powder and 5kg of Fischer-Tropsch wax are added, and the SBS asphalt cement particles are prepared by blending, wherein the kneading temperature is 120 ℃, the rotating speed is 30r/min and the time is 6min. And (3) granulating the mixture by a spiral discharging, single-screw extruding and underwater granulating machine to obtain SBS modified asphalt cement particles, and isolating the mixed SBS modified asphalt cement particles by calcium carbonate powder with the mass of 1% of the mass of the SBS modified asphalt cement particles, wherein the performances of the obtained SBS modified asphalt cement particles are shown in Table 2.
And (B) step (B): according to mass percentage, 5% of SBS modified asphalt cement particles are added into 92.5% of mixture OGFC-13, 2.5% of matrix asphalt is supplemented, the mixture is stirred in a room for 3min at 180 ℃, then a test piece of modified asphalt mixture is prepared, and the performance of the mixture is tested after 48h curing at room temperature. The prepared SBS modified asphalt mixture is numbered 2, and the performances are shown in Table 3.
Example 3
Step A: SBS modified asphalt with the mass content of 18% is prepared in advance (performance is shown in table 2), 70kg of SBS modified asphalt with the mass content of 18% is pumped into a 200L kneading internal mixer at 180 ℃, 30kg of mineral powder and 5kg of Fischer-Tropsch wax are added, and the SBS asphalt cement particles are prepared by blending, wherein the kneading temperature is 120 ℃, the rotating speed is 30r/min and the time is 6min. And (3) granulating the mixture by a spiral discharging, single-screw extruding and underwater granulating machine to obtain SBS modified asphalt cement particles, and isolating the mixed SBS modified asphalt cement particles by calcium carbonate powder with the mass of 1% of the mass of the SBS modified asphalt cement particles, wherein the performances of the obtained SBS modified asphalt cement particles are shown in Table 2.
And (B) step (B): according to mass percentage, adding 2.4% of SBS modified asphalt cement particles into 94.3% of asphalt mixture OGFC-13, supplementing 3.3% of matrix asphalt, stirring for 3min in a room at 180 ℃, preparing a test piece of modified asphalt mixture, and carrying out test on the performance of the mixture after 48h maintenance at room temperature. The prepared SBS modified asphalt mixture is numbered 3, and the performances are shown in Table 3.
Comparative example 1:
comparative example 1 the formulation and preparation method of the SBS modified asphalt cement particles in example 1 are similar, except that comparative example 1 was used to prepare asphalt mixture by directly mixing SBS modified asphalt with hot aggregate and mineral powder by wet method. Wherein, the SBS modified asphalt cement obtained in comparative example 1 in Table 2 is data obtained by mixing SBS modified asphalt with mineral powder and then not granulating.
The performance test of the asphalt mixture in the examples and the comparative examples comprises a conventional Marshall stability test, is used for measuring the thermal stability and the plastic deformation resistance of the asphalt mixture, also comprises porosity and the like, and provides accurate basis for the composition proportion design of the asphalt mixture.
TABLE 1 SBS modified asphalt cement particle composition in examples 1-3
| Examples numbering | 1 | 2 | 3 |
| SBS content in SBS modified asphalt | 6％SBS | 12％SBS | 18％SBS |
| SBS modified asphalt | 40％ | 50％ | 70％ |
| Mineral powder | 60％ | 50％ | 30％ |
TABLE 2 Properties of the particles of examples 1-3 and the SBS modified asphalt cement obtained in comparative example 1
TABLE 3 SBS modified asphalt mixture Properties of examples 1-3 and comparative example 1
As shown by the data in tables 1 to 3, the SBS modified asphalt cement particles have good performance, the dispersion efficiency of the SBS modified asphalt cement particles is obviously improved by adding a dispersing agent, the SBS modified asphalt cement particles can be used for preparing asphalt mixtures by partially or completely replacing common asphalt, and the prepared asphalt mixtures have excellent high-temperature and low-temperature properties; and moreover, the SBS modified asphalt cement particles are convenient to transport and suitable for small-scale road construction.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The SBS modified asphalt cement particles are characterized by comprising SBS modified asphalt and filler; in the SBS modified asphalt cement particles, the weight content of the SBS modified asphalt is 40-80%, and the weight content of the filler is 20-60%.
2. The SBS modified asphalt cement particle of claim 1, further comprising a dispersant, wherein the dispersant comprises 1-5% by weight of the SBS modified asphalt cement particle, and wherein the sum of the weight contents of the SBS modified asphalt, the filler, and the dispersant is no more than 100%.
3. The SBS modified asphalt cement particles according to claim 1, wherein the SBS modified asphalt has a weight content of SBS of 6-20%; the SBS is linear or star-shaped, and the number average molecular weight of the SBS is 6-30 ten thousand g/mol.
4. The SBS modified asphalt cement particles according to claim 2, wherein said dispersant is at least one of stearate, fischer-tropsch wax, microcrystalline wax.
5. The SBS modified asphalt cement particles according to claim 1, wherein the filler is mineral powder, the constituents of the mineral powder being calcium carbonate, calcium oxide, slaked lime or a combination thereof; the particle size of the mineral powder is less than 75 microns.
6. The SBS modified asphalt cement particles according to claim 1, wherein the size of the SBS modified asphalt cement particles is 2-10mm.
7. The preparation method of the SBS modified asphalt cement particles is characterized by comprising the following steps:
step 1, mixing and kneading SBS modified asphalt and part of filler, and then performing melt extrusion, wherein the temperature of mixing and kneading is 100-150 ℃;
and step 2, granulating the molten extrudate, and isolating the obtained granules by using residual fillers to obtain SBS modified asphalt cement particles.
8. The method for preparing SBS modified asphalt cement particles according to claim 7, wherein the SBS modified asphalt is obtained by modifying a matrix asphalt with a grade ranging from 50 to 110#, wherein the matrix asphalt is a heavy traffic asphalt.
9. The method for preparing SBS modified asphalt cement particles according to claim 7, wherein the addition amount of said partial filler is 20 to 60% of the total addition amount of said partial filler and said remaining filler.
10. Use of SBS modified asphalt cement particles according to any of claims 1-6 in the preparation of asphalt mixtures.
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| CN102849987A (en) * | 2012-08-14 | 2013-01-02 | 北京建筑工程学院 | Low-emission composite phase-change modified asphalt mixture and preparation method thereof |
| CN104403333A (en) * | 2014-11-10 | 2015-03-11 | 汪红兵 | Modified asphalt cement particle, preparation method and applications thereof |
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