CN107541082B - Modified asphalt with self-repairing capability and preparation method thereof - Google Patents
Modified asphalt with self-repairing capability and preparation method thereof Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 152
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 238000010008 shearing Methods 0.000 claims abstract description 57
- 229920000137 polyphosphoric acid Polymers 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 19
- 230000002745 absorbent Effects 0.000 claims abstract description 14
- 239000002250 absorbent Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 26
- 239000010439 graphite Substances 0.000 claims description 24
- 229910002804 graphite Inorganic materials 0.000 claims description 24
- 210000002268 wool Anatomy 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- OHUPZDRTZNMIJI-UHFFFAOYSA-N [Cs].[W] Chemical compound [Cs].[W] OHUPZDRTZNMIJI-UHFFFAOYSA-N 0.000 claims description 10
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 12
- 238000012423 maintenance Methods 0.000 abstract description 8
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 22
- 239000002174 Styrene-butadiene Substances 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 239000011384 asphalt concrete Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000002835 absorbance Methods 0.000 description 4
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- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241001441571 Hiodontidae Species 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
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- 238000013508 migration Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- KFSLWBXXFJQRDL-UHFFFAOYSA-N peroxyacetic acid Substances CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses modified asphalt with self-repairing capability and a preparation method thereof. The method selects a high-speed shearing machine to fully mix the matrix asphalt, the butadiene styrene rubber, the infrared absorbent, the heat-conducting agent and the polyphosphoric acid at high temperature to prepare the modified asphalt with the self-repairing capability. Meanwhile, the modified asphalt product is stable, high in viscosity and toughness and good in high and low temperature performance. The invention has the advantages of prolonging the service life of the road, reducing the road maintenance cost and achieving the purpose of saving resources.
Description
Technical Field
The invention relates to the technical field of modified asphalt, in particular to modified asphalt with self-repairing capability and a preparation method thereof.
Background
The asphalt pavement has the advantages of rapid traffic, comfortable driving, low noise and the like, and becomes the preferred pavement in modern road construction. Meanwhile, the asphalt pavement is influenced by factors such as automobile load, temperature change and the like in the long-term use process, the strength and the rigidity of the asphalt pavement are gradually reduced, and in addition, the problem of reflection cracks caused by a semi-rigid base layer commonly used in China is solved, so that fatigue cracking is easily caused at the moment, and the pavement is damaged. In addition, the road surface can be damaged loosely due to the washing of rainwater. This has a very adverse effect on the safety and comfort of the vehicle. Therefore, it is a major concern of researchers how to improve the road performance and prolong the service life of asphalt pavement.
At present, road construction in China has reached a considerable scale, and many roads have entered a stage of needing large-scale maintenance. Therefore, how to maintain the road surface simply and efficiently and ensure that the road surface can meet the requirement of road performance for a long time after maintenance is the problem to be solved at present.
Many previous studies have demonstrated that the strength and rigidity of asphalt are partially restored in a pause period after the asphalt material is damaged to a certain degree, which is the self-repairing behavior of the asphalt material. Asphalt as a viscoelastic material can exhibit flowing characteristics under the action of high temperature and load, and asphalt molecules on the surfaces of cracks are contacted due to flowing, so that adsorption and diffusion can be generated under the action of van der Waals force, and a foundation is provided for self-repairing of the asphalt.
Although the self-repairing capability of asphalt has been widely accepted, the self-repairing performance of asphalt is still in the preliminary experiment stage when the consideration of aspects such as pavement design and pavement fatigue life prediction is taken into consideration. At present, the researchers mix steel grit in the AC-13CSBS modified asphalt concrete as a conductive material, so that the asphalt concrete can be rapidly heated under the action of an electromagnetic induction machine, asphalt in the material flows due to the heating, and cracks generated by internal damage are closed to achieve the purpose of self-repairing of the material. However, the repair is actually realized by manually operating the electromagnetic induction machine, which is more complicated to a certain extent and has high maintenance cost.
Therefore, in order to solve the problem that the large-scale maintenance of the asphalt pavement is difficult, the technical personnel in the field are dedicated to developing a modified asphalt with self-repairing capability and a preparation method thereof.
Disclosure of Invention
In order to solve the problem that the large-scale maintenance of the asphalt pavement is difficult, the technical personnel in the field are dedicated to developing a modified asphalt with self-repairing capability and a preparation method thereof.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a modified asphalt with self-repairing capability comprises matrix asphalt, styrene butadiene rubber, an infrared absorbent, a heat-conducting agent and polyphosphoric acid.
Preferably, the styrene butadiene rubber accounts for 3.0-5.0% of the mass of the matrix asphalt;
preferably, the infrared absorbent accounts for 4.5-6.5% of the mass of the matrix asphalt;
preferably, the heat conducting agent accounts for 20-30% of the mass of the matrix asphalt;
preferably, the polyphosphoric acid accounts for 1.0-2.0% of the mass of the matrix asphalt.
Preferably, the base asphalt is 70# heavy traffic asphalt of national standard;
preferably, the styrene-butadiene rubber is SBR-1500, and the styrene content in the styrene-butadiene rubber is 23.5 percent;
preferably, the infrared absorbent is one or more of crystalline flake graphite, nano graphite flake and nano cesium tungsten bronze powder; more preferably, the infrared absorbent is a mixture of nano graphite flakes and nano cesium tungsten bronze powder in a mass ratio of 1: 2-2: 1.
The added flake graphite, nano graphite flake and nano cesium tungsten bronze powder has excellent infrared light absorption performance, absorbs more energy under sunlight, provides sufficient energy for self-repairing of asphalt, and accelerates the self-repairing process of asphalt.
Preferably, the heat conducting agent is steel wool or aluminum wool, wherein the diameter of the steel wool is less than or equal to 0.5mm, the length of the steel wool is less than or equal to 1cm, the diameter of the aluminum wool is less than or equal to 0.5mm, and the length of the aluminum wool is less than or equal to 1 cm.
The added heat conducting agent has good heat conductivity, transfers heat from the road surface to the roadbed, avoids the phenomenon of heat islands, and accelerates the self-repairing process of the asphalt road surface.
The invention also provides a preparation method of the modified asphalt with self-repairing capability, which comprises the following steps:
(1) melting the matrix asphalt at 120-130 ℃;
(2) adding styrene butadiene rubber, an infrared absorbent and a heat conducting agent, maintaining the constant temperature, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine;
(3) adding polyphosphoric acid at 150-160 ℃, maintaining constant temperature, and shearing for 40min at the rotation speed of 4000rpm by using a high-speed shearing machine;
(4) and cooling to room temperature under natural conditions to obtain the modified asphalt with self-repairing capability.
The invention has three obvious effects: the infrared absorbent with excellent infrared absorption is added into the matrix asphalt to improve the absorption of the infrared light of the asphalt pavement and gather more heat, thereby accelerating the self-repairing process of the asphalt pavement. Moreover, due to the heat-conducting property of the heat-conducting agent, the heat island effect of the asphalt road can be avoided, and heat is transferred to the roadbed from the road surface, so that the self-repairing process of the asphalt road surface is accelerated; secondly, the viscosity toughness and toughness of the modified asphalt are obviously improved by adding polyphosphoric acid into the matrix asphalt, and the prepared modified asphalt with self-repairing capability has the viscosity toughness of more than 8.3 N.m and the toughness of more than 4.5 N.m, so that the modified asphalt has better high and low temperature performance; and thirdly, the service life of the road is prolonged, the road maintenance cost is reduced, the problem that the large-scale maintenance of the asphalt pavement is difficult is solved, and the aim of saving resources is fulfilled.
Detailed Description
The present invention is further illustrated by the following examples, which are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
The specific parameters of some of the materials used in the examples are as follows:
flake graphite: particle diameter of 0.5mm-1mm, carbon content of 80-90%, and density of 2.1-2.3g/cm3Qingdao hexagonal gold graphite, Inc.;
nano graphite sheet: the size of the micro-sheet is 0.5-20 μm, the thickness of the micro-sheet is 5-20nm, and the carbon content>99.5% and a density of about 2.25g/cm3Nanjing Ching nanotechnology, Inc.;
nano cesium tungsten bronze powder: CAS number 189619-69-0, molecular formula Cs0.33WO3Particle diameter of<20nm；
70# asphalt: the Mooney petrochemical grade-A asphalt No. 70 has a penetration of 60-80 (mm), a ductility of more than or equal to 100cm, a softening point of more than or equal to 46 ℃, and a density of: 1.036g/cm3；
Steel wire: the diameter is 0.5mm, and the Dongguan city creates Zhanhong metal materials Limited; crushing the steel wires into steel wire wool by using a steel wire crusher;
aluminum wire: the diameter is 0.5mm, the Shenzhen hong jin Tai coating technology Limited company uses a steel wire crusher to crush the aluminum wire into aluminum velvet;
styrene Butadiene Rubber (SBR): SBR-1500, styrene-butadiene rubber with styrene content of 23.5%, Shanghai Judao chemical industry;
polyphosphoric Acid (PPA): CAS: 8017-16-1, P2O5％≥83.3％，H3PO4Not less than 115.0%, Yunnan Tian Yao chemical Co.
Comparative example 1:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of the 70# asphalt, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then heating to 160 ℃ and keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
comparative example 2:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of the 70# asphalt, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
comparative example 3:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt and steel wool accounting for 30 wt% of the mass of 70# asphalt, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotating speed of 4000rpm by using a high-speed shearing machine; then heating to 160 ℃ and keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
comparative example 4:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt and steel wool accounting for 30 wt% of the mass of 70# asphalt, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotating speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotation speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
comparative example 5:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of the 70# asphalt and 5.0 wt% of nano graphite sheets, keeping the temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 1:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt, 5.0 wt% of crystalline flake graphite and 30 wt% of steel wool, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 2:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of the 70# asphalt, 5.0 wt% of nano graphite flakes and 30 wt% of steel wool, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 3:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt, nano cesium tungsten bronze powder accounting for 5.0 wt% of the mass of 70# asphalt and steel wool accounting for 30 wt% of the mass of 70# asphalt, keeping the constant temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 4:
melting 70# asphalt to 130 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt, 3.0 wt% of nano graphite sheets, 20 wt% of nano cesium tungsten bronze powder and 30 wt% of steel wool, keeping the temperature at 130 ℃, and shearing for 60min at the rotation speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 160 ℃, keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 5:
melting 70# asphalt to 120 ℃, adding SBR accounting for 3.0 wt% of the mass of 70# asphalt, 4.5 wt% of crystalline flake graphite and 20 wt% of aluminum velvet, keeping the constant temperature at 120 ℃, and shearing for 60min at the rotating speed of 4000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.0 wt% of the mass of the 70# asphalt, heating to 150 ℃ and keeping the temperature constant, shearing for 40min at the rotating speed of 4000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
example 6:
melting 70# asphalt to 120 ℃, adding SBR accounting for 5.0 wt% of the mass of 70# asphalt, 6.5 wt% of crystalline flake graphite and 20 wt% of aluminum velvet, keeping the constant temperature at 120 ℃, and shearing for 60min at the rotating speed of 4000rpm by using a high-speed shearing machine; then PPA accounting for 2.0 wt% of the mass of the 70# asphalt is added, the mixture is heated to 150 ℃ and kept at a constant temperature, a high-speed shearing machine is used for shearing for 40min at the rotating speed of 4000rpm, and the mixture is cooled to room temperature under natural conditions to obtain modified asphalt;
example 7:
melting 70# asphalt to 120 ℃, adding SBR accounting for 4.8 wt% of the mass of 70# asphalt, 6.0 wt% of crystalline flake graphite and 20 wt% of aluminum velvet, keeping the constant temperature at 120 ℃, and shearing for 60min at the rotating speed of 5000rpm by using a high-speed shearing machine; then adding PPA accounting for 1.5 wt% of the mass of the 70# asphalt, heating to 150 ℃ and keeping the temperature constant, shearing for 40min at the rotating speed of 5000rpm by using a high-speed shearing machine, and cooling to room temperature under natural conditions to obtain modified asphalt;
test example 1:
the modified asphalts obtained in comparative examples 1 to 4 and examples 1 to 4 were coated on 0.7mm common colorless glass sheets, respectively, the thickness of the asphalt portion was controlled to be 1.0mm, and the absorbance was measured with a UV-1800 spectrophotometer, and the results are shown in Table 1;
TABLE 1 Absorbance of modified asphalts obtained in comparative examples 1 to 4 and examples 1 to 4
As can be seen from comparison between comparative examples 1 to 4 and examples 1 to 4, the absorbance of the modified asphalt obtained in examples 1 to 4 under infrared light of 700 to 1100nm is significantly higher than that of the modified asphalt obtained in comparative examples 1 to 4. Therefore, the addition of the crystalline flake graphite, the nano graphite flake or the nano cesium tungsten bronze powder in the matrix asphalt can obviously improve the absorbance of the asphalt under 700-1100 nm infrared light. The infrared light accounts for 50% of sunlight, and when the crystalline flake graphite, the nano graphite flake or the nano cesium tungsten bronze powder is added into the matrix asphalt, the absorption of the asphalt pavement to the infrared light can be obviously improved, more heat is gathered, and therefore the self-repairing process of the asphalt road is accelerated. Moreover, due to the good heat-conducting property of the crystalline flake graphite, the nano graphite flake and the heat-conducting agent, the heat island effect of the asphalt road can be avoided, and heat is transmitted to the roadbed from the road surface, so that the self-repairing process of the asphalt road surface is accelerated. In addition, in example 4, compared with examples 1 to 3, under the condition that the infrared absorbent has the same mass, the nano graphite flake and the nano cesium tungsten bronze powder are added simultaneously, and the light absorption effect of the modified asphalt under infrared light is better than that of the modified asphalt added with one infrared absorbent alone.
Test example 2
The modified asphalt obtained in comparative examples 1, 2 and 5 and examples 2 to 4 was tested with a KD2 thermal performance analyzer (Becagon Devices Inc), and the obtained data were calculated by the formulas (1) and (2) to obtain the thermal conductivity of the modified asphalt as shown in table 2.
T＝m0+m1t+m2In t (1)
Where T is the recorded temperature, T is the time, m0Is the ambient temperature, m1Rate of change of background temperature, m2Is the temperature migration rate of the material;
k＝q/4πm2(2)
where k is the thermal conductivity and q is the heat of formation of the instrument.
TABLE 2 thermal conductivity of modified asphalts obtained in comparative examples 1, 2 and 5 and examples 2, 3 and 4
| Sample name | Thermal conductivity (W/(m.K)) |
| Comparative example 1 | 0.12 |
| Comparative example 2 | 0.13 |
| Comparative example 5 | 0.19 |
| Example 2 | 0.23 |
| Example 3 | 0.25 |
| Example 4 | 0.29 |
As can be seen from comparison between comparative examples 1 to 2 and 5 and examples 2 to 4, the thermal conductivity of the modified asphalt obtained in examples 2 to 4 was significantly improved as compared with that of the modified asphalt obtained in comparative examples 1 to 2 and 5. Therefore, the addition of the steel wool to the asphalt can obviously improve the heat conductivity coefficient of the asphalt. Therefore, the significant improvement in thermal conductivity can accelerate heat transfer within the asphalt road, thereby promoting the self-repair process of the asphalt road.
Test example 3:
asphalt concrete blocks were prepared according to the related art specifications in the Highway asphalt pavement construction Specification (JTG F40-2004). Adding the modified asphalt obtained in the comparative example 2 and the modified asphalt obtained in the example 4 into stones with the particle size of 10-15 mm according to the oilstone ratio of 4.8:100 respectively to prepare 100 x 50mm asphalt concrete blocks, and sawing the blocks to form a crack with the width of 3mm and the depth of 3cm by using a knife; placing the asphalt concrete block with the crack facing downwards, and placing an infrared lamp with the power of 300W at a position 10cm above the asphalt concrete block; the infrared lamp is turned on for 3min every day, cooled for 30min, repeated for 10 times, and kept standing at room temperature for 10 days in the rest time. The results show that the "splits" of the concrete block prepared from the modified asphalt obtained in example 4 were substantially repaired, whereas the "splits" of the concrete block prepared from the modified asphalt obtained in comparative example 2 were not significantly changed.
Test example 4:
the modified asphalt obtained in comparative example 1 and examples 1 to 4 were tested according to the GB/T4509-2010 asphalt penetration determination method, the GB/T4507-2014 asphalt softening point determination method, the SH/T0735-2003 asphalt toughness test method and the GB/T4508-2010 asphalt ductility determination method, and the test results are shown in Table 3:
table 3 shows properties of modified asphalts obtained in comparative example 1 and examples 1 to 4
Through comparison between the comparative example 1 and the examples 1 to 4, the penetration degree of the modified asphalt obtained by adding the infrared absorbent, the heat conducting agent and the polyphosphoric acid is lower than that of the modified asphalt obtained by the comparative example 1, and the toughness are both greatly improved; and the high toughness means that the strength, the anti-rutting capability, the high and low temperature stability and the anti-cracking performance of the asphalt can be improved. The reason for this may be that the complex polarization neutralization, esterification, protonation of matrix sites, and crosslinking among the infrared absorber, the thermal conductor, PAA, SBR, and asphalt change the solid mass fraction of the asphalt, thereby improving the compatibility of SBR and asphalt.
Claims (6)
1. A modified asphalt with self-repairing capability is characterized in that: comprises matrix asphalt, styrene butadiene rubber, an infrared absorbent, a heat-conducting agent and polyphosphoric acid; the infrared absorbent accounts for 4.5-6.5% of the mass of the matrix asphalt; the infrared absorbent is one or more of crystalline flake graphite, nano graphite flake and nano cesium tungsten bronze powder; the heat conducting agent accounts for 20-30% of the mass of the matrix asphalt; the heat conducting agent is steel wool or aluminum wool, wherein the diameter of the steel wool is less than or equal to 0.5mm, the length of the steel wool is less than or equal to 1cm, the diameter of the aluminum wool is less than or equal to 0.5mm, and the length of the aluminum wool is less than or equal to 1 cm.
2. The modified asphalt with self-repairing capability of claim 1, characterized in that: the styrene butadiene rubber accounts for 3.0-5.0% of the mass of the matrix asphalt.
3. The modified asphalt with self-repairing capability of claim 1, characterized in that: the polyphosphoric acid accounts for 1.0-2.0% of the mass of the matrix asphalt.
4. The modified asphalt with self-repairing capability according to any one of claims 1 to 3, characterized in that: the matrix asphalt is 70# heavy traffic asphalt of national standard.
5. The modified asphalt with self-repairing capability according to any one of claims 1 to 3, characterized in that: the styrene butadiene rubber is SBR-1500, and the styrene content of the styrene butadiene rubber is 23.5 percent.
6. The preparation method of the modified asphalt with self-repairing capability of any one of claims 1 to 5, characterized by comprising the following steps:
(1) melting the matrix asphalt at 120-130 ℃;
(2) adding styrene butadiene rubber, an infrared absorbent and a heat conducting agent, maintaining the constant temperature, and shearing for 60min at the rotating speed of 4000-5000 rpm by using a high-speed shearing machine;
(3) adding polyphosphoric acid at 150-160 ℃, maintaining constant temperature, and shearing for 40min at the rotating speed of 4000-5000 rpm by using a high-speed shearing machine;
(4) and cooling to room temperature under natural conditions to obtain the modified asphalt with self-repairing capability.
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| CN201710778483.1A CN107541082B (en) | 2017-09-01 | 2017-09-01 | Modified asphalt with self-repairing capability and preparation method thereof |
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| CN201710778483.1A CN107541082B (en) | 2017-09-01 | 2017-09-01 | Modified asphalt with self-repairing capability and preparation method thereof |
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| Publication Number | Publication Date |
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| CN107541082A CN107541082A (en) | 2018-01-05 |
| CN107541082B true CN107541082B (en) | 2020-04-28 |
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| CN111019367A (en) * | 2019-12-23 | 2020-04-17 | 四川氟瑞物联科技有限公司 | Asphalt cold mixing agent |
| CN111004516A (en) * | 2019-12-23 | 2020-04-14 | 四川氟瑞物联科技有限公司 | Preparation method of self-repairing cold-mix modified asphalt |
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