CN104559263A - Nano/polymer compound modified asphalt material and preparation method thereof - Google Patents
Nano/polymer compound modified asphalt material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a nano/polymer compound modified asphalt material which comprises a nano material, a polymer and matrix asphalt, wherein the nano material is one of a nano ZnO and nano TiO2 mixture, nano ZnO and nano CaCO3. When the nano material is the nano ZnO and nano TiO2 mixture, the polymer is SBS, and the mass fractions of nano ZnO, TiO2 and SBS in the nano/polymer compound modified asphalt material are 3%, 0.5% and 3.7%, respectively. When the nano material is nano ZnO, the polymer is SBS, and the mass fractions of nano ZnO and SBS in the nano/polymer compound modified asphalt material are 5% and 4.2%, respectively. When the nano material is nano CaCO3, the polymer is SBS, and the mass fractions of nano CaCO3 and SBS in the nano/polymer compound modified asphalt material are 5% and 4%, respectively. The nano/polymer compound modified asphalt material has favorable high-temperature rut resistance and low-temperature crack resistance simultaneously.
Description
Technical field
The present invention relates to a kind of modified asphalt material and preparation method thereof, be specifically related to a kind of nanometer/polymer composite modified asphalt material and preparation method thereof.
Background technology
Very general at China's summer hot cold Area distribution, the places such as northern Shensi, northeast, North China have.The external environment in summer hot cold area is very easy to make road surface to produce rut and cracking disease, all proposes very high requirement for the high temperature of asphalt and low-temperature performance.Traditional bituminous material is difficult to the requirement simultaneously meeting opposing rut and cracking, especially more outstanding for summer hot cold area.
At present, though SBS modifying asphalt has better pavement performance, but SBS modifying asphalt also has very large weak point, and one is that the dispersion state of SBS in matrix pitch is even not; Two is that the dispersion particle diameter of SBS in matrix pitch is bigger than normal.Thus cause SBS modifying asphalt after the factor effect for some time such as traffic load, there will be damage in various degree, affect the life cycle on road surface; Though SBR modifying asphalt can improve the low-temperature performance of matrix pitch effectively, prevent bituminous pavement due to temperature too low and produce cracking disease, but the high temperature improving SNR of SBR to matrix pitch is unsatisfactory.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of nanometer/polymer composite modified asphalt material and preparation method thereof, this composite modified asphalt material meets the requirement of high temperature and low-temperature performance simultaneously, and preparation method is simple.
For achieving the above object, nanometer of the present invention/polymer composite modified asphalt material is made up of nano material, polymkeric substance and matrix pitch;
Described nano material is nano-ZnO and nano-TiO
2mixture, nano-ZnO and Nano-meter CaCO3
3in one;
When described nano material is nano-ZnO and nano-TiO
2mixture time, described polymkeric substance is SBS, massfraction, the TiO of nano-ZnO in wherein nanometer/polymer composite modified asphalt material
2massfraction and the massfraction of SBS be respectively 3%, 0.5% and 3.7%;
When described nano material is nano-ZnO, described polymkeric substance is SBS, and wherein, in nanometer/polymer composite modified asphalt material, the massfraction of nano-ZnO and the massfraction of SBS are respectively 5% and 4.2%;
When described nano material is Nano-meter CaCO3
3time, described polymkeric substance is SBR, wherein, and Nano-meter CaCO3 in nanometer/polymer composite modified asphalt material
3massfraction and the massfraction of SBR be respectively 5% and 4%.
The preparation method of nanometer of the present invention/polymer composite modified asphalt material comprises the following steps:
Take nano material, polymkeric substance and matrix pitch, by nano material and mixed with polymers even, again matrix pitch is heated to be uniform liquid, then the mixture of nano material and polymkeric substance is joined in the matrix pitch of uniform liquid, and carry out at a constant temperature stirring and shearing, obtain nanometer/polymer composite modified asphalt material.
Nano material and polymkeric substance are placed in stirrer and stir, then join in the matrix pitch of uniform liquid, be then shear 40min by shears after stirring 20min under the condition of 170 DEG C in temperature, obtain nanometer/polymer composite modified asphalt material.
The present invention has following beneficial effect:
Nanometer of the present invention/polymer composite modified asphalt material is made up of nano material, polymkeric substance and matrix pitch, add nano material and polymkeric substance by giving in matrix pitch simultaneously, thus the low-temperature performance of the nanometer making the present invention prepare/polymer composite modified asphalt material and high-temperature behavior are improved simultaneously, simultaneously in preparation process, only need first nano material to be mixed with polymer phase, add matrix pitch again, shear after stirring, required nanometer/polymer composite modified asphalt material can be obtained, preparation method is simple, and practicality is extremely strong.
Accompanying drawing explanation
The scanning electron microscope comparison diagram that Fig. 1 (a) is SK-70 matrix pitch;
The scanning electron microscope comparison diagram that Fig. 1 (b) is SBS modifying asphalt;
The scanning electron microscope comparison diagram that Fig. 1 (c) is ZnO/SBS composite modified asphalt;
Fig. 1 (d) is ZnO/TiO
2the scanning electron microscope comparison diagram of/SBS composite modified asphalt;
The scanning electron microscope comparison diagram that Fig. 1 (e) is SBR modifying asphalt;
Fig. 1 (f) is CaCO
3the scanning electron microscope comparison diagram of/SBR composite modified asphalt;
The fluorescence micrograph comparison diagram that Fig. 2 (a) is SK-70 matrix pitch;
The fluorescence micrograph comparison diagram that Fig. 2 (b) is SBS modifying asphalt;
The fluorescence micrograph comparison diagram that Fig. 2 (c) is ZnO/SBS composite modified asphalt;
Fig. 2 (d) is ZnO/TiO
2the fluorescence micrograph comparison diagram of/SBS composite modified asphalt;
The fluorescence micrograph comparison diagram that Fig. 2 (e) is SBR modifying asphalt;
Fig. 2 (f) is CaCO
3the fluorescence micrograph comparison diagram of/SBR composite modified asphalt;
Fig. 3 (a) is nano-ZnO/SBS composite modified asphalt infrared spectrogram;
Fig. 3 (b) is nano-ZnO/TiO
2/ SBS composite modified asphalt infrared spectrogram;
Fig. 3 (c) is Nano-meter CaCO3
3/ SBS composite modified asphalt infrared spectrogram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Nanometer of the present invention/polymer composite modified asphalt material is made up of nano material, polymkeric substance and matrix pitch;
Described nano material is nano-ZnO and nano-TiO
2mixture, nano-ZnO and Nano-meter CaCO3
3in one;
When described nano material is nano-ZnO and nano-TiO
2mixture time, described polymkeric substance is SBS, massfraction, the TiO of nano-ZnO in wherein nanometer/polymer composite modified asphalt material
2massfraction and the massfraction of SBS be respectively 3%, 0.5% and 3.7%;
When described nano material is nano-ZnO, described polymkeric substance is SBS, and wherein, in nanometer/polymer composite modified asphalt material, the massfraction of nano-ZnO and the massfraction of SBS are respectively 5% and 4.2%;
When described nano material is Nano-meter CaCO3
3time, described polymkeric substance is SBR, wherein, and Nano-meter CaCO3 in nanometer/polymer composite modified asphalt material
3massfraction and the massfraction of SBR be respectively 5% and 4%.
The preparation method of nanometer of the present invention/polymer composite modified asphalt material comprises the following steps:
Take nano material, polymkeric substance and matrix pitch, by nano material and mixed with polymers even, again matrix pitch is heated to be uniform liquid, then the mixture of nano material and polymkeric substance is joined in the matrix pitch of uniform liquid, and carry out at a constant temperature stirring and shearing, obtain nanometer/polymer composite modified asphalt material.
Nano material and polymkeric substance are placed in stirrer and stir, then join in the matrix pitch of uniform liquid, be then shear 40min by shears after stirring 20min under the condition of 170 DEG C in temperature, obtain nanometer/polymer composite modified asphalt material.
1) material technology index analysis
Nano-ZnO is produced by Shaanxi Sino-Academy Nano-Materials Co., Ltd., in various nano inoganic particle, its various aspects of performance is comparatively outstanding, and market value also inexpensively, and its application prospect widely, be subject to increasing researcher paid close attention to, its technical indicator is as shown in table 1.
Table 1
| Test item | Detected result | Eligibility requirements |
| Zinc oxide (ZnO) content/% | 95.24 | ≥95.0 |
| Hydrochloric acid insoluble substance (%) | 0.015 | ≤0.05 |
| Calcination loss (%) | 1.61 | ≤4.0 |
| The water solubles (%) | 0.69 | ≤0.7 |
| Tap density (g/ml) | 0.36 | ≤0.40 |
| Specific surface area (m 2/g) | -- | ≥35 |
| Electronic Speculum median size (nm) | 30 | ≤80 |
| XRD line broadening method method average crystal grain (nm) | 54 | ≤80 |
| Reunion index | -- | ≤100 |
Nano-meter CaCO3
3produced by Shandong Hai Ze nano-calcium carbonate company limited, the preparation of company to nano-powder reaches industrialization degree, overweight environment is obtained by the universal gravity constant rotated, thus on molecular scale, chemical reaction, whole crystallisation process are controlled, obtain compared with small particle size and equally distributed nano-calcium carbonate particles powder, its technical indicator is as shown in table 2.
Table 2
Nano-TiO
2produced by Guangdong Ao Na new chemical materials company limited, it is a kind of polymorphous compound, in white powder, high-temperature behavior can be improved to after matrix pitch modification, there is very strong anti-uv-ray simultaneously, its pavement performance has good anti-aging effect, can prolonging service life of pavement, and its technical indicator is as shown in table 3.
Table 3
SBR is produced by Shandong Zibo Zi great Chemical trade company limited, in white granular, carries out the high temperature performance that modification can improve bituminous binder, especially low-temperature performance to matrix pitch.The divinyl of linear structure is soft section, and extensional better performances, its performance perameter is as shown in table 4.
Table 4
| Performance perameter | Color | Granularity (order) | Drc (%) | Combined styrene (%) | Mooney viscosity |
| Operative norm | Range estimation | GB/T2916 | GB/T1040 | GB/T8658 | GB/T1232 |
| Detected result | White | ＜80 | 100 | 17～19 | 68 |
SBS is the YH-791 linear product of being produced by Yueyang petrochemical corporation (complex), in the grain column of white, has good low-temperature flexibility performance and tensile strength, its fundamental performance parameter is as shown in table 5.
Table 5
Matrix pitch selects Korea S SK-70 matrix pitch, and the requirement according to " highway engineering pitch and Asphalt Mixture Experiment code " (JTG E-20-2011) carries out routine test to the fundamental property of matrix pitch, and macro property index is as shown in table 6.
Table 6
2) composite modified asphalt three norms is analyzed
The pitch three norms of three kinds of composite modified asphalt schemes that matrix pitch and the present invention propose as shown in Table 7 contrasts known: the Asphalt Penetration after composite modified is obviously low than matrix pitch numerical value, and softening temperature, ductility are significantly improved, show that composite modified asphalt has pitch high and low temperature performance and improve effect preferably.
Table 7
(3) composite modified asphalt aging analysis
Bituminous cements after aging to film heating carries out mass loss, residual penetration degree when ductility test, by the ageing resistance of these three kinds of its nano-compound modified pitches of metrics evaluation.Three kinds of composite modified asphalts and the matrix pitch aging simultaneous test data of the present invention's proposition are as shown in table 8.
Table 8
In weathering process, the vaporization losses that the light component of pitch causes is greater than oxygen uptake weightening finish, and show as weightlessness after therefore aging, more multilist its ageing resistance bright is poorer in mass loss.Mass loss after three kinds of composite modified scheme film heatings that the present invention proposes are aging comparatively matrix pitch all reduces, wherein the mass loss of the nano-compound modified pitch of 3%ZnO+0.5%TiO2+3.7%SBS is only 0.09%, reduce 86.0% compared with matrix pitch, showed good ageing resistance.By the sequence of mass loss size be: 3%ZnO+0.5%TiO2+3.7%SBS < 5%ZnO+4.2%SBS < 5%CaCO3+4%SBR < matrix pitch, nano-compound modified pitch obviously can improve the ageing resistance of matrix pitch as can be seen here.
Residual penetration ratio is used for evaluating the increase of pitch hardness after overaging.Under normal conditions, basis bitumen and modified bitumen, after the test of rotary thin film in drying oven short ageing, can diminish than aging hardening its penetration degree test value that causes before due to pitch.What table 8 remained that penetration ratio data show three kinds of composite modifiers adds the ageing resistance can both improving matrix pitch.
Harden after ageing of asphalt, ductility diminishes, and therefore the residual ductility of pitch can react the ageing information of pitch to a certain extent, reacts the resistance of aging of pitch and aging rear low-temperature performance further.Ductility data in contrast table 8: 10 DEG C of ductility losses of matrix pitch are maximum, and 10 DEG C of ductilities after TFOT is aging are only 9.6cm, reduce 86.1% time more unaged; 48.3%, 75.9%, 58.4% is reduced when 5 DEG C of ductilities after the nano-compound modified ageing of asphalt of 3%ZnO+0.5%TiO2+3.7%SBS, 5%ZnO+4.0%SBR, 5%ZnO+4.2%SBS are more unaged respectively.As can be seen here, three kinds of various performances of nano-compound modified pitch are comparatively outstanding, can adapt to road surface ageing resistance in use better, create the disease such as low temperature and fatigue crack tool improve significantly for bituminous pavement because of aging.
(4) composite modified asphalt SHRP analysis of experiments
A () DSR analysis of experiments is analyzed
The dynamic properties of pitch well close to material visco-elasticity behavior under conditions of use, can be highly suitable for the pavement performance predicting pitch in this approach.By measuring complex shear modulus G in process of the test
*with phasing degree δ, then with the rut factor G obtained
*the composition of/sin δ size to material is analyzed, and also can study the impact of condition of different temperatures on various pitch rheological characteristics simultaneously, and then characterize the high-temperature behavior of nano-compound modified pitch.Test-results is as shown in table 9.
Table 9
As can be seen from Table 9, at identical test temperature, 3 kinds of nano-compound modified pitch G* are all higher than matrix pitch, and comparatively SK-70 matrix pitch is stronger to show the ability of nano-compound modified pitch at high temperature resistance to deformation.Phasing degree δ is less than the δ value of equal matrix pitch, shows that nano-compound modified pitch provides more component of elasticity to support shear-stable effect than matrix pitch under same temperature condition.The Rutting parameter numerical value of 3 kinds of composite modified asphalts and matrix pitch show ability that various composite modified asphalt resists shearing strain and high temperature Rut resistance tension set under the high temperature conditions all comparatively matrix pitch oil significantly improve.
(b) BBR analysis of experiments
BBR test adopts slope m two parameters of bending creep stiffness modulus S and creep curve to evaluate the crack resistance at low-temperature of pitch.Test temperature is chosen to be-12 DEG C ,-18 DEG C and-24 DEG C, and the creep stiffness modulus S of test determination and creep curve slope m, testing data is as shown in table 10.
Table 10
As can be seen from Table 10, the creep stiffness modulus S value of 3 kinds of composite modified asphalts is at-12 DEG C ,-18 DEG C and-24 DEG C, comparatively matrix pitch reduces 31.5%, 26.6%, 11.7% respectively, and 30.1%, 36.9%, 13.9%, 31.9%, 42.5%, 15.5%.The m value of three kinds of nano-compound modified pitches comparatively matrix pitch improves 10.3%, 12.8%, 13.6%, 9.9%, 8.9%, 7.6%, 7.4% respectively.The evaluation result of combined creep progress modulus S and creep curve slope m value, thinks that the composite modifier tool in nano-compound modified pitch is significantly improved the effect of low-temperature performance.
3) composite modified asphalt isolation test is analyzed
In order to analyze the stability in storage of composite modified asphalt, with the segregation degree of better evaluating combined modification.Carry out isolation test to the nano material of polymkeric substance, polymkeric substance and nano material, polymkeric substance and finishing respectively, test period chooses 4h, 12h, 24h, 48h respectively, to study each stage of composite modified asphalt segregation better.Isolation test result is as shown in table 11.
Table 11
As shown in Table 11, three kinds of selected nano-compound modified bitumen compatibilities are all better, and the state of storage-stable under hot conditions can be kept.SBS or SBR two kinds of composite modified asphalts compare, and can find no matter whether add nano material, and SBR all shows the good consistency with matrix pitch.
4) composite modified asphalt microtexture is divided
A) composite modified asphalt scanning electron microscope analysis
Adopt the sample preparation of vacuum metal spraying, with Dutch PHILIPS XIJ30-ESEM ambient electronic flying-spot microscope to the photography of modifying asphalt microstructure observing, nanometer and the polymer composite modified material pattern in pitch and the interface cohesion situation with pitch directly can be observed.The scanning electron microscope imaging results of various pitch as shown in Figure 1.The form of its properties-correcting agent all there occurs change, and concrete outcome is as follows:
(1) microscopic appearance of SK-70 matrix pitch is equally distributed, and (b), (e), compared with (a), have obvious shape characteristic.After but SBS and SBR adds matrix pitch, all clearly can not be recognized SBS and SBR from SEM photo.
(2) Fig. 1 (c), 1 (d) two kinds of composite modified asphalts have obvious shape characteristic compared with SK-70 matrix pitch, SBS modifying asphalt, become finer and close.SBS adds the fundamental property can improving pitch in matrix pitch, mainly because of the result that SBS and matrix pitch be combined with each other on microcosmic.Significantly can find out SBS particle skewness in matrix pitch from Fig. 1 (c), particle diameter is comparatively large, as nano-ZnO or nano-ZnO/TiO
2add after, ZnO/SBS composite modified asphalt and ZnO/TiO can be found out from the flying-spot microscope image results of Fig. 1 (c), 1 (d)
2/ SBS composite modified asphalt reaches extraordinary dispersion effect in nano-scale range, adds the binding ability of SBS and asphalt interface.ZnO/TiO simultaneously
2much better than ZnO/SBS composite modified asphalt dispersion effect of/SBS composite modified asphalt.From macroscopically also finding out that composite modified asphalt is more far better than matrix pitch, SBS modifying asphalt.
(3) Fig. 1 (f) composite modified asphalt also has obvious shape characteristic compared with SK-70 matrix pitch, SBR modifying asphalt, becomes finer and close.Composite modifier is cut into very small particle by high-speed shearing machine, and especially SBR is vesicular structure, the small molecule component in Absorbable rod pitch and oil content, these small particles completely by pitch infiltration and encirclement, Nano-meter CaCO3
3add organic and inorganic between consistency, make Nano-meter CaCO3
3/ SBR is dispersed in pitch on microcosmic, improves the binding ability of SBR and asphalt interface, macroscopically shows good use properties.
B) composite modified asphalt fluorescence microscopic analysis
Adopt pressed disc method sample preparation, the BX41 type fluorescence microscope photography of producing with Olympus is observed the modified effect of modifying asphalt, the response characteristic difference of differing materials to fluorescence is utilized to distinguish, fluorescent microscope sample preparation is simple, and can not the dispersion state of disturbance properties-correcting agent in pitch, size and the actual distribution situation of modifier particles can be observed simultaneously.Observations as shown in Figure 2.
Image as can be seen from Fig. 2:
(1) nano-ZnO/SBS composite modified asphalt and nano-ZnO, TiO
2the distribution of/SBS composite modified asphalt and SBS modifying asphalt is different, and in SBS modifying asphalt, SBS is scattered in pitch with floss, and has a small amount of accumulation phenomena.And SBS is distributed in pitch with very thin bar shaped in composite modified asphalt, and form reticulated structure, nano modifier all reaches uniform subdivision cloth with the state of small granules simultaneously.Fig. 2 (c), 2 (d) are examined and can find out nano-ZnO, nano-TiO
2/ SBS composite modified asphalt is more much better than the dispersiveness of nano-ZnO/SBS composite modified asphalt.Therefore, through nano-ZnO, the TiO of surface active
2obviously can improve the dispersion effect of SBS modifying asphalt.
(2) SBR and matrix pitch are after stirring+shearing action, although SBR particle is cut into molecule further, at Nano-meter CaCO3
3when not adding, the dispersion effect of SBR is unsatisfactory.But at Nano-meter CaCO3
3after adding, Nano-meter CaCO3
3the micro Distribution of/SBR composite modified asphalt is significantly improved, SBR and CaCO
3dispersion effect in matrix pitch is very even, has given full play to Nano-meter CaCO3 after surface active
3advantage.Therefore, the use of nano material significantly can improve the distribution of SBR modifying asphalt.
C) composite modified asphalt Infrared spectroscopy
Adopt solvent method sample preparation, with the Nicolet-740 infrared spectrometer that U.S. Buddhist nun high-tensile strength infrared spectrometer company produces, modifying asphalt microcosmic blend mechanism is studied.Infrared spectrogram result as shown in Figure 3.
Contrast the basis bitumen and modified bitumen in three figure, be very easy to find matrix pitch at 2250 ~ 2500cm
-1between absorption peak faded away, mainly due to the result of matrix pitch and a part of hydroxyl generation chemical reaction.Fig. 3 (a) and (b) middle nano-ZnO characteristic peak 3400cm
-1the absorption peak at place is without nano-TiO in, Fig. 3 (b)
2characteristic peak 3500cm
-1the absorption peak at place is without Nano-meter CaCO3 in, Fig. 3 (c)
3characteristic peak 508cm
-1and 3700cm
-1the absorption peak at place reduces, the disappearance of these characteristic peaks or weaken and demonstrate hydroxyl in melt blending process and there occurs chemical reaction with the nano particle through surface active.The absorption peak of polymer modified asphalt and the absorption peak of matrix pitch contrast should gap to some extent, but can find out that collection of illustrative plates is comparatively similar from both infrared spectrograms, and analyzing reason may be the cause that the group in matrix pitch covers polymer features peak.And the position residing for other absorption peak keeps consistency substantially, not new absorption peak occurs, the size of the just intensity of change.
Therefore, the sign do not disappeared from polymer features peak to prove polymkeric substance and asphalt modification process based on physically modified, weaken from nano material characteristic peak or the sign proof nano particle that disappears and asphalt modification process based on chemical modification.Show that carrying out composite modified preparation nanometer/polymer composite modified asphalt through the nano particle of surface active to polymer modified asphalt is a very complicated physical and chemical process, both there occurs physical change and also there occurs chemical reaction in whole process.
Claims (3)
1. nanometer/polymer composite modified asphalt material, is characterized in that, is made up of nano material, polymkeric substance and matrix pitch;
Described nano material is nano-ZnO and nano-TiO
2mixture, nano-ZnO and Nano-meter CaCO3
3in one;
When described nano material is nano-ZnO and nano-TiO
2mixture time, described polymkeric substance is SBS, massfraction, the TiO of nano-ZnO in wherein nanometer/polymer composite modified asphalt material
2massfraction and the massfraction of SBS be respectively 3%, 0.5% and 3.7%;
When described nano material is nano-ZnO, described polymkeric substance is SBS, and wherein, in nanometer/polymer composite modified asphalt material, the massfraction of nano-ZnO and the massfraction of SBS are respectively 5% and 4.2%;
When described nano material is Nano-meter CaCO3
3time, described polymkeric substance is SBR, wherein, and Nano-meter CaCO3 in nanometer/polymer composite modified asphalt material
3massfraction and the massfraction of SBR be respectively 5% and 4%.
2. the preparation method of nanometer according to claim 1/polymer composite modified asphalt material, is characterized in that, comprise the following steps:
Take nano material, polymkeric substance and matrix pitch, by nano material and mixed with polymers even, again matrix pitch is heated to be uniform liquid, then the mixture of nano material and polymkeric substance is joined in the matrix pitch of uniform liquid, and carry out at a constant temperature stirring and shearing, obtain nanometer/polymer composite modified asphalt material.
3. the preparation method of nanometer according to claim 2/polymer composite modified asphalt material, it is characterized in that, nano material and polymkeric substance are placed in stirrer and stir, join again in the matrix pitch of uniform liquid, then be shear 40min by shears after stirring 20min under the condition of 170 DEG C in temperature, obtain nanometer/polymer composite modified asphalt material.
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| CN109370242A (en) * | 2018-11-06 | 2019-02-22 | 湖南交通职业技术学院 | A kind of modified asphalt composite and preparation method thereof |
| CN109504108A (en) * | 2018-11-21 | 2019-03-22 | 魏林涛 | A kind of weather-proof modified pitch |
| CN110396300A (en) * | 2019-06-18 | 2019-11-01 | 郑州航空工业管理学院 | A kind of nano-compound modified pitch and preparation method thereof |
| CN111423736A (en) * | 2020-04-26 | 2020-07-17 | 郑州航空工业管理学院 | Preparation method of nano carbon powder, SBS (styrene butadiene styrene) and rubber powder composite modified asphalt |
| CN113999536A (en) * | 2021-06-28 | 2022-02-01 | 黑玄土集团有限公司 | Anti-aging modified asphalt mixture and preparation method thereof |
| CN115594984A (en) * | 2021-10-22 | 2023-01-13 | 东南大学（Cn） | Temperature-adjusting modified asphalt based on titanium dioxide quantum dots and preparation method thereof |
| CN115594984B (en) * | 2021-10-22 | 2023-10-03 | 东南大学 | Temperature-regulating modified asphalt based on titanium dioxide quantum dots and preparation method thereof |
| CN114353706A (en) * | 2022-01-11 | 2022-04-15 | 哈尔滨工业大学 | Asphalt two-dimensional morphology determination method based on environmental scanning electron microscope |
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