CN117720822A - Modified warm mix rubber asphalt and preparation method thereof - Google Patents
Modified warm mix rubber asphalt and preparation method thereof Download PDFInfo
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- CN117720822A CN117720822A CN202311623897.9A CN202311623897A CN117720822A CN 117720822 A CN117720822 A CN 117720822A CN 202311623897 A CN202311623897 A CN 202311623897A CN 117720822 A CN117720822 A CN 117720822A
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 9
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides modified warm mix rubber asphalt and a preparation method thereof. The required raw materials comprise: 65-75 parts of 70# matrix asphalt, 5-8 parts of rubber powder I, 6-8 parts of rubber powder II, 8-14 parts of rubber powder III, a modified additive I, a modified additive II and a modified additive III. Wherein the modified additive I warm mix agent consists of zeolite powder, long-chain alkane silicone oil, naphthene base oil and glyceryl monostearate, the modified additive II flow aid consists of polyethylene wax emulsion, sodium dodecyl sulfate and nano calcium carbonate, the modified additive III consists of vitamin connecting agent and aromatic oil, and the rubber powders I, II and III have different particle sizes. The modification method comprises the following steps: and the temperature is controlled by heating for three times, so that the expansion and degradation of the rubber powder in the asphalt are accelerated, the rubber-asphalt is fully combined, the high-temperature and low-temperature performances of the rubber asphalt can be improved, and the high-temperature rutting resistance, the low-temperature cracking resistance and the ageing resistance of the asphalt mixture are further improved.
Description
Technical Field
The application relates to the field of asphalt and asphalt mixture, in particular to modified warm-mix rubber asphalt and a preparation method thereof.
Background
According to traffic department data, the number of the trucks nationwide in 2016 is 1351 ten thousand, the number of the trucks is 2143 ten thousand in 2022, and the total ton number of the trucks is greatly increased from 10827 ten thousand in 2016 to 16967.33 ten thousand in 2022. In recent years, with the development of society and economy in China, the improvement of logistics industry chains, the reduction of freight requirements, the continuous increase of the capacity of social trucks and the particularly great increase of single car loads. The method provides a serious challenge for highway construction and highway load requirements in China. The traditional asphalt pavement is easy to generate ruts, pits, cracks and other diseases in the service process. The road construction at present requires higher requirements on rut resistance and fatigue resistance of the road surface. In order to prolong the service life of the asphalt pavement, development of asphalt mixture with more excellent service performance is needed. At present, a common method for modifying asphalt is to add a modifier to modify the asphalt. The modified asphalt commonly used at present comprises SBS modified asphalt, rubber modified asphalt and the like.
Rubber asphalt is a modified asphalt prepared by adding rubber powder into matrix asphalt. As a novel material used in road construction, the road performance of the mixture can be effectively improved. Raw materials used for rubber asphalt can be classified into natural rubber and waste rubber (tires, etc.) according to the source of rubber. The improvement of rubber by using waste tires as raw materials and further processing the waste tires into rubber powder as a modifier has been widely used. The rubber asphalt is used for mixing, so that the asphalt has good high and low temperature performances, the high temperature rutting resistance, the low temperature cracking resistance, the fatigue resistance, the corrosion resistance and the ageing resistance of the asphalt mixture can be improved, and the influence of heavy traffic and bad weather can be effectively resisted. In addition, the waste rubber has low cost, can come from waste tires, can consume a large amount of solid waste while improving the asphalt performance, and is more beneficial to resource recycling and environmental protection. In order to improve the overall properties of rubber asphalt, the usual methods generally include pretreatment, adjustment of raw materials or reaction conditions, addition of additives and improvement of storage conditions.
It is estimated that the yield of waste tires in China exceeds 2200 ten thousand tons at the end of 2023 year, the waste tires are difficult to decompose in natural environment, and the waste tires are crushed to prepare rubber powder for asphalt modification, so that not only can the service performances of asphalt be improved, but also the environmental problems caused by the waste tires can be relieved, and the cost of asphalt modification is saved. The addition of the waste rubber powder can obviously improve the viscosity of the asphalt at high temperature, reduce the deformation at low temperature, and is beneficial to improving the high-temperature stability and the low-temperature crack resistance of the asphalt.
Often, rubber asphalt is produced with a large amount of toxic gases, such as H 2 S and the like are important problems of how to reduce the emission of toxic gases, and at present, desulfurization treatment is carried out on rubber powder or a warm mixing agent is added in the modification process to reduce the preparation temperature and the generation of the harmful gases. The warm mixing agent is an additive material which can obviously reduce the construction temperature of the asphalt mixture through physical and chemical actions. After the warm mix additive is added, the mixing temperature and rolling temperature of the asphalt mixture can be reduced by more than 30 ℃ and the technical performance of the asphalt mixture can reach the index of the same type of hot mix asphalt mixture.
Problems exist in the prior warm mix rubber asphalt patent technology
Problem 1: in the prior rubber asphalt modification patent technology, only rubber powder with one particle size is generally selected for modification, and the combination of the rubber powder with different particle sizes cannot be studied, so that the modification effect is single and the utilization rate is low.
Problem 2: in the prior art of rubber asphalt modification, one temperature is usually selected, temperature control for modifying various particle sizes together is lacked, and different temperatures are selected for modifying rubber powder with different particle sizes, so that environmental pollution caused by overhigh temperature is avoided.
Problem 3: at present, the viscosity of the rubber asphalt is too high, the mixing construction temperature of the mixture is easily caused to be too high, the construction difficulty is further increased, the thermo-oxidative aging of the asphalt is accelerated, in the existing rubber asphalt patent technology, the rubber asphalt is only regulated by adding a modifier, and the ageing resistance and the high-low temperature performance cannot be comprehensively improved from various particle sizes of rubber powder, different modification temperatures and additives.
Problem 4: in the prior art of rubber asphalt modification, aiming at more toxic and harmful smoke generated in the process of producing and mixing rubber asphalt, only a warm mixing agent is generally added to reduce the mixing temperature, and the field of researching the relation between the particle size and the modification temperature is not enough.
Disclosure of Invention
Aiming at the problems brought by the conditions, the invention provides a preparation method of modified warm mix rubber asphalt. The components of the composition in parts by weight are as follows: (1) 65-75 parts of 70# matrix asphalt; (2) 5-8 parts of rubber powder I, 5-8 parts of rubber powder II and 8-14 parts of rubber powder III; (3) 1-2 parts of a warm mixing agent; (4) the modified additive II is 1-2 parts of flow aid; (5) 2-4 parts of modified additive III; wherein the rubber powder is prepared by grinding waste tires and desulfurizing; the particle size distribution interval of each material is 20-40 meshes of rubber powder I, 40-60 meshes of rubber powder II and 60-80 meshes of rubber powder III. The preparation process of the asphalt is regulated, and the temperature is controlled by three times of heating (40 min for modification at 140-150 ℃, 40min for modification at 160-180 ℃ and 100min for modification at 190-200 ℃), so that the modified asphalt has good high and low temperature properties, and the high temperature rutting resistance, the low temperature cracking resistance and the ageing resistance of the asphalt mixture can be improved.
Preferably, the modified additive I is a warm mixing agent which consists of 80-90 parts of zeolite powder, 1-2 parts of long-chain alkane silicone oil, 2-5 parts of cycloparaffin base oil and 3-10 parts of glyceryl monostearate;
the modified additive II comprises 1 to 2 parts of polyethylene wax emulsion, 2 to 3 parts of sodium dodecyl sulfate and 1 to 3 parts of nano calcium carbonate;
the modified additive III comprises 1-2 parts of vitamin connecting agent and 1-3 parts of aromatic oil.
Preferably, the invention provides a preparation method of modified warm mix rubber asphalt, which comprises the following steps:
step 1, grinding and sieving the waste tires by using a grinder, and dividing the waste tires into rubber powder I with 20-40 meshes, rubber powder II with 40-60 meshes and rubber powder III with 60-80 meshes, wherein the rest meshes are not used.
And 2, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 3, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 4, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 5, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 6, placing the rubber powder I in the oven for 1h to keep the temperature at 120 ℃, placing the devulcanized rubber powder II in the oven for 1h to keep the temperature at 140 ℃, and placing the devulcanized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 7, placing the heated matrix asphalt into a high-speed shearing machine, adding the modified additive I, controlling the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 8, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 140-150 ℃, maintaining the temperature and stirring for 40min.
And 9, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature and stirring for 40min.
And 10, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 190-200 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Preferably, the matrix asphalt is 70# matrix asphalt.
Further, asphalt properties were measured according to the Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011), and the penetration at 25℃was 6.7mm, the ductility at 5℃was 69mm, the softening point was 48.9℃and the rotational viscosity at 135℃was 0.921 Pa.s and the rotational viscosity at 180℃was 0.124 Pa.s.
Preferably, the rubber powder used in the modified asphalt is derived from waste tires and is prepared by grinding waste tires into rubber powder.
Further, when rubber powder produced from waste tires is used, desulfurization treatment is required.
Further, the microwave desulfurization device used for the treatment is 915MHz and the temperature is 260 ℃.
Preferably, the flow aid consists of 1-2 parts of polyethylene wax emulsion, 2-3 parts of sodium dodecyl sulfate and 1-3 parts of nano calcium carbonate.
Preferably, the vitamin connecting agent is a polymer prepared by processing butadiene as a raw material, and is totally called as an octene polymer rubber reactant.
Further, the density of the vitamin linker at 20℃is 0.913 g.cm -3 The water content was 0.22%, the volatile matter was 0.47%, the ash content was 0.05%, and the melting point was 57.4 ℃.
Preferably, the medium-temperature mixing agent is WSG-H01, so that continuous foaming and lubrication are realized in the asphalt production process, and the preparation temperature of the rubber asphalt is reduced.
Preferably, the aromatic oil described herein is aromatic in its main component and may be used to supplement the light components of the base asphalt, thereby enhancing the reaction between the rubber crumb and the asphalt.
Further, the high temperature viscosity is relatively low, which is beneficial to the dilution of the rubber asphalt to improve the construction workability.
Preferably, a water washing method is used to determine the optimum grade ratio of the fine aggregate.
Preferably, the Marshall test in Highway asphalt pavement construction Specification (JTGF 40-2004) is used to determine the optimum whetstone ratio of the mix.
Preferably, the prepared rubberized asphalt should be used as soon as possible, and should not exceed 7 hours at most.
The invention has the beneficial effects that:
1. the invention selects rubber powder with 20-40 meshes and 40-60 meshes to have larger particle size, can reduce the solubility in the swelling stage and has sufficient swelling degree; the 60-80 mesh rubber powder can enable the solubility of the rubber asphalt to be increased in the degradation stage, the degradation degree is increased, the network structure in the rubber powder is enlarged and loosened, light components and oil wax components in the asphalt enter the network structure of the rubber powder, the rubber powder can be converted into suspended bicontinuous phases from a suspended discontinuous state, the network structure can be formed between the rubber powder, and the rubber powder and the asphalt form a mutually inlaid double network structure, so that the rubber powder is fully compatible with the asphalt, and therefore, the novel rubber asphalt prepared from the rubber powder with three particle sizes is selected, not only can the use rate of the rubber powder be improved, but also the high-temperature rutting resistance, low-temperature cracking resistance, ageing resistance and storage stability of the asphalt can be improved.
2. According to the invention, the temperature is controlled by heating for three times (40 min for modification at 140-150 ℃, 40min for modification at 160-180 ℃ and 100min for modification at 190-200 ℃) for different particle sizes in the modification stage, the modification temperature increases in a gradient manner, so that the cross-linking effect among rubber molecules is broken, the rubber particles are disintegrated, the breaking of rubber molecular chains is caused by the degradation, the molecular weight of the rubber is reduced, and on the premise of avoiding environmental pollution caused by overhigh temperature, each particle size rubber powder is fully swelled at the optimal modification temperature, and is fully degraded in different heat preservation time, so that better compatibility is achieved, and the high and low temperature performances of the rubber asphalt can be improved.
3. According to the invention, a flow aid consisting of polyethylene wax emulsion and sodium dodecyl sulfate nano calcium carbonate is added in the process of preparing the rubber asphalt, the polyethylene wax emulsion has good lubricity, and the sodium dodecyl sulfate nano calcium carbonate can reduce the surface tension of rubber powder and asphalt, improve the compatibility of the rubber powder and asphalt, and finally increase the flowability of the rubber asphalt, so that the workability, viscosity, durability and crack resistance of the rubber asphalt mixture are improved.
4. The modified additive III comprises the vitamin connecting agent and the aromatic oil, has relatively low high-temperature viscosity, is favorable for diluting the rubber asphalt to improve the workability of construction, can promote swelling degradation of the rubber powder at high temperature, promote crosslinking of the rubber powder and the asphalt, can improve the ageing resistance and the storage stability of the rubber asphalt, and reduces the operation difficulty in construction.
5. In general, rubber asphalt is prepared by controlling the modification temperature between 220 ℃ and 230 ℃ to ensure that rubber powder particles can be sufficiently heated and swelled, and a large amount of toxic gas is generated. The invention is characterized in that warm mixing agent composed of zeolite powder, long-chain alkane silicone oil, naphthene base oil and glyceryl monostearate is added in the preparation process, so that continuous foaming and wetting in the asphalt production process are realizedThe asphalt modified asphalt is smooth, and the preparation temperature of asphalt modification can be reduced; rubber powders with different particle diameters are selected, and the modification temperature is gradually increased, so that modification can be performed at the optimal temperature, and environmental pollution caused by overhigh temperature is avoided; the waste rubber powder is subjected to microwave desulfurization treatment, so that the energy consumption and CO can be effectively reduced 2 、H 2 S and other harmful gases are discharged, so that the method has good economic and environmental benefits.
Drawings
FIG. 1 is a schematic diagram of the process flow for preparing the modified warm mix rubber asphalt of the invention.
Detailed Description
The following embodiments will provide a clear and complete demonstration of the concept, objects, technical solutions and effects of the present invention, and the objects, features and effects of the present invention will be fully understood by referring to the following embodiments and the accompanying drawings. It is to be understood that the embodiments described are merely examples of some of the invention, which are representative and serve to illustrate the application.
Example 1A modified Warm mix rubber asphalt and method of making
1. Preparing raw materials: 70 parts of matrix asphalt, 6 parts of rubber powder I, 6 parts of rubber powder II, 8 parts of rubber powder III, 1 part of modified additive I, 2 parts of modified additive II and 4 parts of modified additive III. The modified additive I is a warm mixing agent and consists of 0.85 part of zeolite powder, 0.02 part of long-chain alkane silicone oil, 0.04 part of cycloparaffin base oil and 0.09 part of glycerin monostearate, the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, the modified additive III comprises 1.3 parts of vitamin connecting agent and 2.6 parts of aromatic oil, the particle size of the rubber powder I is 30 meshes, the particle size of the rubber powder II is 50 meshes, and the particle size of the rubber powder III is 70 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, placing the rubber powder I in the oven for 1h to keep the temperature at 120 ℃, placing the devulcanized rubber powder II in the oven for 1h to keep the temperature at 140 ℃, and placing the devulcanized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, adding the modified additive I, controlling the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 140-150 ℃, maintaining the temperature and stirring for 40min.
And 8, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature and stirring for 40min.
And 9, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 190-200 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Example 2A modified Warm mix rubber asphalt and method of making
1. Preparing raw materials: 68 parts of matrix asphalt, 8 parts of rubber powder I, 6 parts of rubber powder II, 10 parts of rubber powder III, 1 part of modified additive I, 2 parts of modified additive II and 3 parts of modified additive III. The modified additive I is a warm mixing agent and consists of 0.85 part of zeolite powder, 0.02 part of long-chain alkane silicone oil, 0.04 part of cycloparaffin base oil and 0.09 part of glycerin monostearate, the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, and the modified additive III comprises 1 part of vitamin connecting agent and 2 parts of aromatic oil, wherein the particle size of rubber powder I is 20 meshes, the particle size of rubber powder II is 40 meshes and the particle size of rubber powder III is 60 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, placing the rubber powder I in the oven for 1h to keep the temperature at 120 ℃, placing the devulcanized rubber powder II in the oven for 1h to keep the temperature at 140 ℃, and placing the devulcanized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, adding the modified additive I, controlling the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 140-150 ℃, maintaining the temperature and stirring for 40min.
And 8, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature and stirring for 40min.
And 9, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 190-200 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Comparative example 1 modified rubber asphalt and preparation method thereof
1. Preparing raw materials: 70 parts of matrix asphalt, 8 parts of rubber powder I, 6 parts of rubber powder II, 10 parts of rubber powder III, 2 parts of modified additive II and 3 parts of modified additive III. Wherein the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, the modified additive III comprises 1 part of vitamin connecting agent and 2 parts of aromatic oil, the particle size of rubber powder I is 20 meshes, the particle size of rubber powder II is 40 meshes, and the particle size of rubber powder III is 60 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, placing the rubber powder I in the oven for 1h to keep the temperature at 120 ℃, placing the devulcanized rubber powder II in the oven for 1h to keep the temperature at 140 ℃, and placing the devulcanized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, controlling the temperature to be 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 150-170 ℃, maintaining the temperature, and stirring for 40min.
And 8, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 180-200 ℃, maintaining the temperature and stirring for 40min.
And 9, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 200-220 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Comparative example 2 Warm mix rubber asphalt and preparation method thereof
1. Preparing raw materials: 75 parts of matrix asphalt, 20 parts of 20-mesh rubber powder, 1 part of modified additive I, 2 parts of modified additive II and 3 parts of modified additive III. The modified additive I is a warm mixing agent and consists of 0.85 part of zeolite powder, 0.02 part of long-chain alkane silicone oil, 0.04 part of cycloparaffin base oil and 0.09 part of glycerin monostearate, the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, and the modified additive III comprises 1 part of vitamin connector and 2 parts of aromatic oil.
2. Preparation method
Step 1, placing the waste rubber powder into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, placing the soaked desulfurization rubber powder into a baking oven at 60 ℃ for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, placing the 20-mesh desulfurized rubber powder in an oven for 1h to keep the temperature at 120 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing instrument, adding the modified additive I, maintaining the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding 20-mesh desulfurized rubber powder, a modified additive II and a modified additive III into a high-speed shearing instrument, stirring at a rotating speed of 1400r/min, heating to 190-200 ℃, and keeping the temperature for stirring for 180min to obtain the common modified warm-mix rubber asphalt.
Comparative example 3 modified warm mix rubber asphalt and preparation method thereof
1. Preparing raw materials: 68 parts of matrix asphalt, 14 parts of rubber powder I, 8 parts of rubber powder II, 1 part of modified additive I, 2 parts of modified additive II and 3 parts of modified additive III. The modified additive I is a warm mixing agent and consists of 0.85 part of zeolite powder, 0.02 part of long-chain alkane silicone oil, 0.04 part of cycloparaffin base oil and 0.09 part of glycerin monostearate, the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, the modified additive III comprises 1 part of vitamin connector and 2 parts of aromatic oil, the particle size of the rubber powder I is 20 meshes, and the particle size of the rubber powder II is 40 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, the rubber powder I is placed in an oven for 1h to keep the temperature at 120 ℃, and the devulcanized rubber powder II is placed in the oven for 1h to keep the temperature at 140 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, adding the modified additive I, controlling the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 140-150 ℃, maintaining the temperature and stirring for 40min.
And 8, adding the desulfurized rubber powder II and the modified additive III into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Comparative example 4 modified warm mix rubber asphalt and preparation method thereof
1. Preparing raw materials: 68 parts of matrix asphalt, 9 parts of rubber powder II, 13 parts of rubber powder III, 1 part of modified additive I, 2 parts of modified additive II and 3 parts of modified additive III. The modified additive I is a warm mixing agent and consists of 0.85 part of zeolite powder, 0.02 part of long-chain alkane silicone oil, 0.04 part of cycloparaffin base oil and 0.09 part of glycerin monostearate, the modified additive II is a flow aid and consists of 0.5 part of polyethylene wax emulsion, 1 part of sodium dodecyl sulfate and 0.5 part of nano calcium carbonate, the modified additive III comprises 1 part of vitamin connector and 2 parts of aromatic oil, the particle size of the rubber powder II is 40 meshes, and the particle size of the rubber powder III is 60 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
And 5, placing the desulfurized rubber powder II in an oven for 1h to keep the temperature at 140 ℃, and placing the desulfurized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, adding the modified additive I, controlling the temperature at 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder II and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature, and stirring for 40min.
And 8, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 190-200 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
Comparative example 5A modified rubber asphalt and its preparation method
1. Preparing raw materials: 68 parts of matrix asphalt, 8 parts of rubber powder I, 6 parts of rubber powder II and 10 parts of rubber powder III. Wherein the particle size of the rubber powder I is 20 meshes, the particle size of the rubber powder II is 40 meshes, and the particle size of the rubber powder III is 60 meshes.
2. Preparation method
Step 1, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min.
And 2, immediately taking out, and soaking in cold water at the temperature of 5 ℃ for 30min.
And 3, respectively placing the soaked desulfurization rubber powder into a 60 ℃ oven for 1h to obtain the dry desulfurization rubber powder.
And 4, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃.
Step 5, placing the rubber powder I in the oven for 1h to keep the temperature at 120 ℃, placing the devulcanized rubber powder II in the oven for 1h to keep the temperature at 140 ℃, and placing the devulcanized rubber powder III in the oven for 1h to keep the temperature at 150 ℃.
And 6, placing the heated matrix asphalt into a high-speed shearing machine, controlling the temperature to be 120 ℃, and stirring at a rotating speed of 1200r/min for 5min.
And 7, adding the desulfurized rubber powder I into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 160-170 ℃, maintaining the temperature, and stirring for 40min.
And 8, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 180-200 ℃, maintaining the temperature and stirring for 40min.
And 9, adding the desulfurized rubber powder III into a high-speed shearing instrument, stirring at a rotating speed of 1800r/min, heating to 210-230 ℃, maintaining the temperature, and stirring for 100min to obtain the modified rubber asphalt.
List one
As can be seen from the results of table 1, the comparative example and comparative example 1 found that the asphalt modified with the rubber powders of various particle sizes at the same time has little difference in ductility at 5 ℃, softening point, penetration, but comparative example 1 has higher modification temperature, consumes more resources and is liable to generate toxic gas to cause environmental pollution; compared with comparative example 2, comparative example 2 only adopts one particle size for modification, the modification effect is poor, and the modification effect is far inferior to the modification by using rubber powder with multiple particle sizes; compared with comparative examples 3 and 4, the modified material is modified by directly selecting two different particle sizes, and the modified effect is modified by selecting three particle sizes; in comparative example 5, rubber powders with different particle diameters were used for modification, but no modifying additive was used, and the modifying effect was inferior to that of modifying by using the modifying additive.
Therefore, the modified warm-mix rubber asphalt and the preparation method thereof have higher modification performance than that of common rubber asphalt or common warm-mix rubber asphalt modified warm-mix rubber asphalt, the ductility of the warm-mix rubber asphalt at 5 ℃ is increased, and the low-temperature crack resistance is enhanced; the softening point is increased, and the high-temperature stability is enhanced; the penetration is reduced, the viscosity is enhanced, the road performance of the mixture prepared by the method can be better met, and the construction requirement can be better met.
Claims (10)
1. The modified warm-mix rubber asphalt is characterized by comprising the following components in parts by weight: (1) 65-75 parts of 70# matrix asphalt; (2) 5-8 parts of rubber powder I, 6-8 parts of rubber powder II and 8-14 parts of rubber powder III; (3) 1-2 parts of a warm mixing agent; (4) the modified additive II is 1-2 parts of flow aid; (5) 2-4 parts of modified additive III;
the particle size distribution interval of each material is 20-40 meshes of rubber powder I, 40-60 meshes of rubber powder II and 60-80 meshes of rubber powder III.
2. A modified warm mix rubber asphalt as defined in claim 1, wherein the 70# base asphalt used has a penetration of 6.7mm at 25 ℃, a ductility of 69mm at 5 ℃, a softening point of 48.9 ℃, a rotational viscosity of 0.921 Pa-s at 135 ℃ and a rotational viscosity of 0.124 Pa-s at 180 ℃; the rubber powder is made of waste tires, and the main component of the rubber powder is natural rubber, the relative density is 0.93, the hardness is 20-100 Shore A, the stretching light degree is 6.89-27.56 MPa, and the stretching rate is 100-700; the physical technical indexes of the road rubber powder comprise: the screen allowance is less than 10 percent, and the volume density is 360-460 g cm -3 The water content is less than 1%, the metal content is less than 0.03%, and the fiber content is less than 0.5%.
3. The modified warm mix rubber asphalt according to claim 1, wherein the modified additive I consists of 80-90 parts of zeolite powder, 1-2 parts of long-chain alkane silicone oil, 2-5 parts of naphthene base oil and 3-10 parts of glyceryl monostearate;
the modified additive II comprises 1 to 2 parts of polyethylene wax emulsion, 2 to 3 parts of sodium dodecyl sulfate and 1 to 3 parts of nano calcium carbonate;
the modified additive III comprises 1-2 parts of vitamin connecting agent and 1-3 parts of aromatic oil.
4. The modified warm mix rubber asphalt of claim 1, wherein the rubber powder comprises the following chemical components in percentage by mass: the natural rubber content is more than 30%, the acetone extract content is less than 16%, the rubber hydrocarbon content is more than 48%, and the carbon black content is more than 28%.
5. The modified warm mix rubber asphalt of claim 1, wherein the modified additive I has a melting point of 108 ℃ and a density of 0.90-0.96 g/cm at 25 ℃ 3 Lightning is 281 ℃.
6. The modified warm mix rubber asphalt according to claim 1, wherein the modified additive II comprises 1-2 parts of polyethylene wax emulsion, 2-3 parts of sodium dodecyl sulfate and 1-3 parts of nano calcium carbonate, and the density at 25 ℃ is 1.10-1.25 g/cm 3 Wherein the carbon atom content is 41%, the hydrogen atom content is 37%, the calcium atom content is 11%, and the oxygen atom content is 9%.
7. The modified warm mix rubber asphalt according to claim 1, wherein the aromatic hydrocarbon content in the modified additive III and the aromatic oil exceeds 90%, and the kinematic viscosity at 100 ℃ is 24-25 mm/s 2 The water content was 0.3% and the aniline point was 24.8 ℃.
8. The modified warm mix rubber asphalt of claim 1, wherein the standard requirements for the rubber asphalt include: the needle penetration at 25 ℃ is 4-8 mm, the softening point is more than 58 ℃, the ductility at 5 ℃ is more than 100mm, the rotational viscosity at 180 ℃ is 2-4 Pa.s, and the elastic recovery at 25 ℃ is more than 55%.
9. A method for preparing the modified warm mix rubber asphalt according to any one of claims 1 to 8, which is characterized by comprising the following steps:
step 1, grinding and sieving the waste tires by using a grinder, and dividing the waste tires into rubber powder I with 20-40 meshes, rubber powder II with 40-60 meshes and rubber powder III with 60-80 meshes;
step 2, respectively placing rubber powder with different particle sizes into a microwave desulfurization device with the frequency of 915MHz and the temperature of 260 ℃ for 5min;
step 3, immediately soaking in cold water at 5 ℃ for 30min after taking out; placing the rubber powder into a baking oven at 60 ℃ for 1h, so that the water content in the desulfurized rubber powder is controlled within 5%;
step 4, respectively placing the soaked desulfurization rubber powder into a baking oven at 60 ℃ for 1h to obtain dry desulfurization rubber powder;
step 5, placing the matrix asphalt into a baking oven at 120 ℃ for 1.5 hours, and enabling the internal temperature of the matrix asphalt to reach 120 ℃;
step 6, placing the desulfurized rubber powder I in a baking oven for 1h to keep the temperature at 120 ℃, placing the desulfurized rubber powder II in the baking oven for 1h to keep the temperature at 140 ℃, and placing the desulfurized rubber powder III in the baking oven for 1h to keep the temperature at 150 ℃;
step 7, placing the heated matrix asphalt into a high-speed shearing machine, adding a modified additive I, controlling the temperature to be 120 ℃, and stirring for 5min at a rotating speed of 1200 r/min;
step 8, adding the desulfurized rubber powder I and the modified additive II into a high-speed shearing instrument, stirring at the rotating speed of 1400r/min, heating to 140-150 ℃, maintaining the temperature and stirring for 40min;
step 9, adding the desulfurized rubber powder II into a high-speed shearing instrument, stirring at the rotating speed of 1600r/min, heating to 160-180 ℃, maintaining the temperature and stirring for 40min;
and 10, adding the desulfurized rubber powder III and the modified additive III into a high-speed shearing instrument, stirring at a rotation speed of 1800r/min, heating to 190-200 ℃, maintaining the temperature, and stirring for 100min to obtain the modified warm-mix rubber asphalt.
10. Use of the rubberized asphalt according to claim 1 for the preparation of a mixture comprising the following steps:
step 1, determining fine aggregates required by asphalt mixture; calculating the optimal level ratio according to the determined fine aggregate;
step 2, determining the optimal oil-stone ratio;
step 3, heating the weighed fine aggregate to 130-140 ℃;
step 4, placing the fine aggregate into an asphalt mixer, and stirring for 2min at a rotating speed of 200-220 r/min;
and 5, pouring the prepared rubber asphalt, and stirring at a rotating speed of 240-260 r/min for 5min to obtain the rubber asphalt mixture.
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