CN113897070B - Furfural residue/illegal cooking oil modified asphalt and preparation method thereof - Google Patents
Furfural residue/illegal cooking oil modified asphalt and preparation method thereof Download PDFInfo
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Abstract
A furfural residue/illegal cooking oil modified asphalt and a preparation method thereof relate to a furfural residue/illegal cooking oil modified asphalt and a preparation method thereof. The invention aims to solve the technical problems of large consumption of fossil resources and the damage of petroleum asphalt to the environment and the physical health of constructors. The furfural slag/illegal cooking oil composite modifier is composed of a furfural slag/illegal cooking oil composite modifier and asphalt, and the preparation method comprises the following steps: 1. drying the furfural residues and screening the furfural residues with a 80-mesh screen; 2. mixing the furfural residue with the illegal cooking oil, shearing, and filtering to obtain a furfural residue/illegal cooking oil composite modifier; 3. and pouring the furfural residue/illegal cooking oil composite modifier into asphalt, shearing and cooling to obtain the furfural residue/illegal cooking oil modified asphalt. The furfural residues can be uniformly dispersed in a illegal cooking oil and asphalt system, the compatibility is good, and the technical problems of large consumption of fossil resources and harm of petroleum asphalt to the environment and the health of constructors are solved. The invention belongs to the technical field of asphalt modification.
Description
Technical Field
The invention relates to furfural residue/illegal cooking oil modified asphalt and a preparation method thereof.
Background
The petroleum asphalt is a byproduct of crude oil processing, and is widely applied to highway construction, anticorrosive materials, waterproof materials and the like. In view of the large consumption of fossil resources and the hazards that petroleum asphalt poses to the environment and the health of construction personnel, scientists are working on replacing or modifying petroleum asphalt with renewable biomass.
Disclosure of Invention
The invention aims to solve the technical problems of large consumption of fossil resources and harm of petroleum asphalt to the environment and the health of constructors, and provides furfural residue/illegal cooking oil modified asphalt and a preparation method thereof.
The furfural residue/illegal cooking oil modified asphalt consists of a furfural residue/illegal cooking oil composite modifier and asphalt, wherein the mass ratio of illegal cooking oil to furfural residue in the furfural residue/illegal cooking oil composite modifier is (2-1) to (1-2), and the mass percentage of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt is 4-20%.
The preparation method of the furfural residue/illegal cooking oil modified asphalt comprises the following steps:
1. drying the furfural residue, putting into a crusher, crushing, and screening with a 80-mesh screen;
2. mixing furfural residues and illegal cooking oil in a mass ratio of 1: 3, shearing at a rotating speed of 5000r/min for 15min, and filtering oil components by a 200-mesh filter screen to obtain a furfural residue/illegal cooking oil composite modifier, wherein the mass ratio of the illegal cooking oil to the furfural residues in the furfural residue/illegal cooking oil composite modifier is (2-1) to (1-2);
3. and (2) putting the furfural residue/illegal cooking oil composite modifier and asphalt in a drying oven at 140 ℃ for 2h, then pouring the furfural residue/illegal cooking oil composite modifier into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the furfural residue/illegal cooking oil modified asphalt.
Step one, the illegal cooking oil is brown yellow, has a pH value of 6.8 and a density of 0.943 g/mL -1 。
In the second step, the furfural residue contains 47.63% of cellulose, 1.44% of hemicellulose, 41.26% of lignin and 4.4% of ash (all dry basis).
The asphalt in the third step is 90# asphalt.
The furfural residue/illegal cooking oil composite modifier accounts for 4-20% of the furfural residue/illegal cooking oil modified asphalt in the third step.
The long-chain fatty acid in the waste edible oil is similar to the saturated partial structure in the asphalt, has good compatibility, can reduce the use of asphalt mixing solvent when used for modifying the asphalt, and also has the softening effect on aged asphalt.
Cellulose and lignin are two of the most abundant natural reserves. The advantages of large specific surface area, high strength and the like of the nano-cellulose are utilized to modify the asphalt, so that the viscoelasticity and the anti-rutting performance are improved. The natural aromatic structure of the lignin and the polycyclic aromatic hydrocarbon of the petroleum asphalt are used for modifying the asphalt by utilizing the advantage that the lignin and the polycyclic aromatic hydrocarbon of the petroleum asphalt have good compatibility, so that the high-temperature stability of the asphalt is improved.
The furfural residues are residues generated in the process of preparing furfural by hydrolyzing agricultural and forestry biomass such as corncobs, bagasse and other raw materials with high pentose content, and the cost is very low. The invention takes furfural residue and illegal cooking oil as raw materials, the furfural residue is fully swelled and uniformly dispersed in the illegal cooking oil, then the furfural residue is used for partially replacing petroleum asphalt, the basic performance of the asphalt is analyzed by three indexes (penetration, softening point and ductility) and a softening point difference method, the maximum modifier mixing amount meeting the standard requirement is obtained, the influence of the modifier mixing amount on the high and low temperature performance of the asphalt is researched by utilizing a dynamic shear rheometer and a bending beam rheometer, and finally the modified asphalt mixing mechanism and microstructure are researched by utilizing an infrared spectrum and a scanning electron microscope.
The furfural residue can absorb part of oil in the asphalt and is crosslinked with asphaltene in the asphalt into a compact structure, so that the hardness of the furfural residue is increased.
The furfural residue/illegal cooking oil composite modifier can reduce the internal temperature stress of asphalt and reduce the possibility of cracking of materials under extremely cold conditions. The stress dissipation capability of the asphalt under the low-temperature condition can be enhanced by adding the furfural residue/illegal cooking oil composite modifier.
The invention has the following advantages:
1. the incorporation of the furfural residue/illegal cooking oil composite modifier can increase the penetration degree of asphalt cement and reduce the softening point of the asphalt cement, and the ductility value of the asphalt cement tends to increase firstly and then decrease along with the increase of the incorporation amount. Compared with asphalt which is independently doped with the illegal cooking oil and the furfural residues, the furfural residue/illegal cooking oil composite modifier is doped with the asphalt with the fluctuation range of three indexes lower, and after 8 percent of the furfural residue/illegal cooking oil composite modifier is doped, the three indexes can meet the standard requirement of No. 90 matrix asphalt.
2. The furfural residue/illegal cooking oil modified asphalt has good thermal storage stability, and when the mixing amount of the furfural residue/illegal cooking oil composite modifier is 8%, the thermal storage stability of the furfural residue/illegal cooking oil composite modifier for 72 hours can still meet the standard requirement.
3. The low-temperature crack resistance of the asphalt after the furfural residue/illegal cooking oil composite modifier is added is better than that of the matrix asphalt. Along with the increase of the mixing amount of the furfural residue/illegal cooking oil composite modifier, the creep rate of the asphalt is increased, the creep stiffness is reduced, the low-temperature stress relaxation performance is enhanced, and the low-temperature crack resistance of the asphalt is improved.
4. The furfural residues can be uniformly dispersed in a illegal cooking oil and asphalt system, the compatibility is good, and the technical problems of large consumption of fossil resources and harm of petroleum asphalt to the environment and the health of constructors are solved.
Drawings
FIG. 1 is a graph of the results of a needle penetration test in test one;
FIG. 2 is a graph comparing the effect of modifier loading on asphalt softening point in test one;
FIG. 3 is a graph comparing the effect of modifier loading on asphalt ductility in test one;
FIG. 4 is a graph comparing the influence of the blending amount of the furfural residue/illegal cooking oil composite modifier on the heat storage stability of asphalt in the first test;
FIG. 5 is a graph comparing the effect of the blending amount of the furfural residue/illegal cooking oil composite modifier on the low-temperature bending creep stiffness of asphalt in the first test;
FIG. 6 is a graph comparing the effect of the amount of furfural residue/illegal cooking oil composite modifier on the creep rate of asphalt in test one;
FIG. 7 is a scanning electron micrograph of furfural residue in test one;
FIG. 8 is a scanning electron microscope image of the furfural residue/illegal cooking oil composite modifier in the first test;
FIG. 9 is a scanning electron microscope image of furfural residue/illegal cooking oil modified asphalt in test I.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first specific implementation way is as follows: the furfural residue/illegal cooking oil modified asphalt comprises a furfural residue/illegal cooking oil composite modifier and asphalt, wherein the mass ratio of illegal cooking oil to furfural residue in the furfural residue/illegal cooking oil composite modifier is (2-1) to (1-2), and the mass percentage of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt is 4% -20%.
The second embodiment is as follows: the difference between the present embodiment and the first embodiment is that the asphalt is 90# asphalt. The rest is the same as the first embodiment.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the mass percentage of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt is 8%. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between the present embodiment and the first to third embodiments is that the mass ratio of the illegal cooking oil to the furfural residue in the furfural residue/illegal cooking oil composite modifier is 1.
The fifth concrete implementation mode: the preparation method of the furfural residue/illegal cooking oil modified asphalt comprises the following steps:
1. drying the furfural residue, putting into a crusher, crushing, and screening with a 80-mesh screen;
2. mixing furfural residues and illegal cooking oil in a mass ratio of 1: 3, shearing at a rotating speed of 5000r/min for 15min, and filtering oil components by a 200-mesh filter screen to obtain a furfural residue/illegal cooking oil composite modifier, wherein the mass ratio of the illegal cooking oil to the furfural residues in the furfural residue/illegal cooking oil composite modifier is (2-1) to (1-2);
3. putting the furfural residue/illegal cooking oil composite modifier and asphalt in a baking oven at 140 ℃ for 2h, then pouring the furfural residue/illegal cooking oil composite modifier into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the furfural residue/illegal cooking oil modified asphalt.
The sixth specific implementation mode: the fifth embodiment is different from the first embodiment in the step oneThe illegal cooking oil is brown yellow, has a pH value of 6.8 and a density of 0.943 g/mL -1 . The rest is the same as the fifth embodiment.
The seventh embodiment: the fifth or sixth difference between the embodiment and the specific embodiment is that in the second step, the furfural residue contains 47.63% of cellulose, 1.44% of hemicellulose, 41.26% of lignin and 4.4% of ash. The other is the same as the fifth or sixth embodiment.
The specific implementation mode eight: the difference between the embodiment and one of the fifth to seventh embodiments is that the mass ratio of the illegal cooking oil to the furfural residue in the furfural residue/illegal cooking oil composite modifier in the second step is 1.125. The rest is the same as one of the fifth to seventh embodiments.
The specific implementation method nine: the difference between the fifth embodiment and the eighth embodiment is that the type of the asphalt in the third step is 90# asphalt. The rest is the same as the fifth to eighth embodiments.
The detailed implementation mode is ten: the difference between the fifth embodiment and the ninth embodiment is that the mass percentage of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt in the third step is 4% -20%. The others are the same as in one of the fifth to ninth embodiments.
The following tests are adopted to verify the effect of the invention:
the preparation method of the furfural residue/illegal cooking oil modified asphalt in the test is carried out according to the following steps:
1. drying the furfural residues, putting into a crusher, crushing and screening by a 80-mesh screen;
2. mixing the furfural residues and the illegal cooking oil according to the mass ratio of 1: 3, shearing at the rotating speed of 5000r/min for 15min, and filtering out oil components by using a 200-mesh filter screen to obtain a furfural residue/illegal cooking oil composite modifier, wherein the mass ratio of the illegal cooking oil to the furfural residues in the furfural residue/illegal cooking oil composite modifier is 1.125;
3. and (2) putting the furfural residue/illegal cooking oil composite modifier and asphalt in a drying oven at 140 ℃ for 2h, then pouring the furfural residue/illegal cooking oil composite modifier into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the furfural residue/illegal cooking oil modified asphalt.
The mass percentages of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt are respectively 4%, 8% and 12%.
The preparation method of the furfural residue modified asphalt in the comparative test is carried out according to the following steps:
1. drying the furfural residue, putting into a crusher, crushing, and screening with a 80-mesh screen;
2. putting the furfural residues and the asphalt in a 140 ℃ drying oven for 2h, then pouring the furfural residues into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the furfural residue modified asphalt.
The mass percentages of the furfural residues in the furfural residue modified asphalt are respectively 4%, 8% and 12%.
The preparation method of the illegal cooking oil modified asphalt in the comparative test is carried out according to the following steps:
and putting the illegal cooking oil and the asphalt in a baking oven at 140 ℃ for 2h, then pouring the illegal cooking oil into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the illegal cooking oil modified asphalt.
The mass percentages of the furfural residue and the illegal cooking oil in the modified asphalt are respectively 4%, 8% and 12%.
1 materials and methods
1.1 test materials
The furfural residue used in the test is produced by Haerbin Xingcheng chemical Co., ltd, wherein the content of cellulose is 47.63%, the content of hemicellulose is 1.44%, the content of lignin is 41.26%, and the content of ash is 4.4% (all dry basis). The dry residue was allowed to stand at 20 ℃ and 90% RH for 3d with a water absorption of 13%. In order to ensure that the furfural residues can be fully and uniformly mixed with the illegal cooking oil and the asphalt, the furfural residues are dried and then put into a crusher to be crushed and sieved by a 80-mesh screen for later use.
The raw material waste oil is frying waste oil which is obtained from local dining shops of Harbin, is brown yellow, has a pH value of 6.8 and has a density of 0.943 g.mL -1 。
The technical indexes and standard requirements of the 90# base asphalt for the experiment are shown in the table 1.
Table 1 technical index of 90# base asphalt
1.2 mixing Furfural residue with illegal cooking oil
Avoid the furfural slag from absorbing light components and oil components in the asphalt to cause the rapid reduction of the low-temperature ductility of the asphalt [14] Mixing the furfural residues and the illegal cooking oil according to the mass ratio of 1: 3, shearing for 15min at 5000r/min to promote the furfural residues to fully absorb oil, filtering out the oil with a 200-mesh filter screen, and collecting filter residues for later use. At the moment, the mixing mass ratio of the illegal cooking oil to the furfural residue is 1.125.
1.3 preparation of modified asphalt
The furfural residue, the illegal cooking oil, the furfural residue/illegal cooking oil composite modifier and the matrix asphalt are placed in a 140 ℃ drying oven for 2h, the furfural residue, the illegal cooking oil and the furfural residue/illegal cooking oil composite modifier with different mass percentages (4%, 8% and 12%) of the asphalt are slowly poured into the asphalt, the asphalt is sheared at the rotating speed of 5000r/min at 140 ℃ for 30min, then the rotor is taken out, and the modified asphalt mucilage is placed at the temperature for 1h, then taken out and cooled for standby.
1.4 analytical methods
1.4.1 three-Large-finger mapping
According to three-index calibration method in road engineering asphalt and asphalt mixture test regulation (JTG E20-2011), penetration, asphalt softening point and 10 ℃ time delay of different asphalt samples at 25 ℃ are tested and analyzed.
1.4.2 thermal storage stability Studies
In order to verify whether the illegal cooking oil/furfural residue composite modified asphalt cement has good thermal storage stability, the thermal storage performance of asphalt is determined by adopting the polymer modified asphalt segregation test standard in road engineering asphalt and asphalt mixture test procedures (JTG E20-2011).
1.4.3 high temperature rheological Properties test
According to an asphalt rheological property experimental method in road engineering asphalt and asphalt mixture test regulations (JTG E20-2011), a Dynamic Shear Rheometer (DSR) is used for measuring a phase angle (delta) and a complex shear modulus (G) of an asphalt sample at 40-90 ℃ at a heating rate of 2 ℃/min.
1.4.4 Low temperature bending creep stiffness Performance test
According to the test scheme of asphalt bending creep stiffness in road engineering asphalt mixture test protocol (JTG E20-2011), a Bending Beam Rheometer (BBR) is used for measuring the low-temperature performance of asphalt at-18 ℃, 24 ℃ and-30 ℃, and the low-temperature performance of the asphalt is analyzed through stiffness modulus (S) and creep rate (m).
1.4.5 Infrared Spectroscopy
Scanning and testing furfural residue, illegal cooking oil, mixture of furfural residue and illegal cooking oil, matrix asphalt and furfural residue/illegal cooking oil modified asphalt sample by adopting a Sammerfei IN10 infrared spectrometer, wherein the scanning wavelength range of the asphalt-containing sample is 600-4000cm －1 The scanning wavelength range of other samples is 400-4000cm －1 。
1.4.6 scanning Electron microscopy analysis
And observing and analyzing the micro-morphologies of the furfural residues, the furfural residue illegal cooking oil mixture and the furfural residues/illegal cooking oil modified asphalt sample by adopting a Zeiss G300 scanning electron microscope.
2 results and discussion
2.1 analysis of three Large index test data
The penetration, softening point and ductility of asphalt are important indexes for representing the basic performance of the asphalt. The penetration is closely related to the viscosity of the asphalt, which can reflect the consistency and softness of the asphalt at 25 ℃. The softening point represents the critical point at which the fluidity of the asphalt reaches a specific state under the action of temperature, and can reflect the stability of the asphalt under high-temperature conditions. Ductility represents the tensile deformability of asphalt under low temperature conditions. The test researches the basic performances of the asphalt of the illegal cooking oil, the furfural residue and the illegal cooking oil/furfural residue composite modifier under different mixing amounts through the penetration degree and the softening point ductility.
The penetration test results are shown in fig. 1, and can be seen from fig. 1: the penetration of the asphalt cement is increased along with the increase of the mixing amount of the illegal cooking oil/furfural residue composite modifier, and when the mixing amount of the modifier is 8 percent, the penetration of the asphalt still can reach 99dmm, thereby meeting the technical requirement that the penetration of No. 90 road petroleum asphalt in the technical Specification for construction of road asphalt pavement is within the range of 80-100 dmm; the needle penetration of the asphalt cement can be increased by adding the illegal cooking oil, the increase rate of the needle penetration is far greater than that of the illegal cooking oil/furfural residue composite modified asphalt, the needle penetration of the asphalt under the mixing amount of 4% of the illegal cooking oil does not meet the standard requirement, and the needle penetration exceeds the measuring range when the mixing amount reaches 12%; the penetration degree of the furfural residues can be reduced, but the penetration degree after the furfural residues are added cannot meet the standard requirement of 90# matrix asphalt. The result shows that the addition of the illegal cooking oil and furfural residue/illegal cooking oil composite modifier can reduce the consistency of the asphalt and reduce the deformation resistance; the addition of the furfural residue can improve the consistency of the asphalt, and the reason for analysis is that the furfural residue can absorb part of oil in the asphalt and be crosslinked with asphaltene in the asphalt into a compact structure, so that the hardness of the asphalt is increased.
FIG. 2 is a graph showing the effect of the blending ratio of three modifiers on the softening point of asphalt, and the graph shows that: along with the increase of the mixing proportion of the illegal cooking oil/furfural residue, the softening point of the asphalt is reduced, and when the mixing amount of the modifier is 12 percent, the softening point of the asphalt is reduced to 42.1 ℃, so that the technical requirement of No. 90 road petroleum asphalt in the technical Specification for construction of road asphalt pavement can be still met; the softening point of the asphalt is reduced sharply by doping the illegal cooking oil, and the standard requirement cannot be met when the doping amount is 4 percent; the addition of the furfural residue can improve the softening point of the asphalt. The result shows that the illegal cooking oil and furfural residue/illegal cooking oil composite modifier can cause adverse effect on the high-temperature stability of the asphalt, and the furfural residue can improve the high-temperature stability of the asphalt.
FIG. 3 shows the effect of different modifier mass fractions on ductility of asphalt cement at 10 ℃ as follows: along with the increase of the mixing amount of the furfural residue/illegal cooking oil composite modifier, the ductility of asphalt mortar tends to rise firstly and then fall, when the mixing amount of the modifier is 4%, the ductility of asphalt rises from 103cm to 112cm and is improved by 8.7%, but when the modifier is added, the ductility of asphalt tends to fall, and when the mixing amount of the modifier is 12%, the ductility of asphalt can still meet the standard requirement of grade-A asphalt No. 90 in the technical Specification for construction of highway asphalt pavement; the ductility of the asphalt cement can be improved by adding a proper amount of the illegal cooking oil, and when the doping amount of the illegal cooking oil is 8%, the ductility is 125cm, which is increased by 21.4% compared with the matrix asphalt; and the ductility of the asphalt mucilage can be greatly reduced by adding the furfural residue. The results show that the low-temperature ductility of the asphalt cement can be improved by adding a proper amount of the illegal cooking oil and furfural residue/illegal cooking oil modifier, and the analysis is mainly that the fluidity of the two modifiers is far better than that of the matrix asphalt under the conditions of normal temperature and low temperature, so that the fluidity of the asphalt under the low-temperature condition can be improved by adding the modifier, but the viscosity of the matrix asphalt can be reduced, and the tensile property of the asphalt can be adversely affected by adding excessive modifier; the furfural residues can reduce the low-temperature performance of the asphalt because the furfural residues can absorb part of oil, resin and other light components in the asphalt, reduce the plasticity and the fluidity of the asphalt and further reduce the low-temperature ductility of the asphalt.
Analysis of three index test data shows that the comprehensive performance of the asphalt added with the furfural residue/illegal cooking oil composite modifier is superior to that of the asphalt added with the furfural residue and the illegal cooking oil separately, and the three indexes of the asphalt cannot meet the standard requirements when the furfural residue and the illegal cooking oil are added separately, so that the subsequent test only analyzes and tests the performance of the furfural residue/illegal cooking oil modified asphalt.
2.2 analysis of Heat storage stability test results
The chemical components and the molecular structures of the furfural residue and the illegal cooking oil are similar to those of asphalt, so that the furfural residue and the illegal cooking oil can be well fused, but the mixing is still mainly physical blending, the asphalt needs to be stored in a high-temperature environment for a long time before use, and in order to verify whether the asphalt performance is influenced due to the fact that the modifier is separated from the asphalt under a long-time thermal storage condition, a softening point difference method is adopted in the test to analyze the thermal storage stability of the modified asphalt, and the test result is shown in figure 4. As can be seen from the figure: the difference value of the softening points of the upper and lower sections of the furfural residue/illegal cooking oil modified asphalt is continuously increased along with the prolonging of the heat storage time, but the change rate of the furfural residue/illegal cooking oil modified asphalt is reduced along with the prolonging of the time, which shows that the internal molecular structure of the furfural residue/illegal cooking oil modified asphalt tends to be stable after a small part of the furfural residue/illegal cooking oil modified asphalt is separated; under the same heat storage time, the larger the mixing amount of the furfural residue/illegal cooking oil composite modifier is, the higher the difference value of the softening points of the asphalt is, and when the addition amount of the modifier reaches 8%, the heat storage stability of the composite modifier for 72 hours can still meet the standard requirement. The result shows that the furfural residue/illegal cooking oil composite modifier has better compatibility with the matrix asphalt.
2.3 Low temperature bending creep stiffness Performance analysis
In the experiment, a Bending Beam Rheometer (BBR) is adopted to test the low-temperature crack resistance of the modified asphalt, and the low-temperature performance of the modified asphalt is evaluated by creep stiffness S and creep rate m, wherein the smaller the S value, the larger the m value, the better the low-temperature crack resistance. The results of the modified asphalt BBR test are shown in fig. 5 and 6, and it can be seen from fig. 5 that: under the same mixing amount of the modifier, the S value of the asphalt increases along with the temperature reduction, which shows that the lower the temperature, the more easily the temperature stress is generated in the asphalt, so that the material is easy to crack; at the same temperature, the S value of the asphalt is reduced along with the increase of the mixing amount of the modifier, which shows that the addition of the furfural residue/illegal cooking oil composite modifier can reduce the internal temperature stress of the asphalt and reduce the possibility of cracking of the material under the extremely cold condition. As can be seen from fig. 6: when the mixing amount of the furfural residue/illegal cooking oil composite modifier is the same, the creep rate of the modified asphalt is reduced along with the reduction of the temperature, which shows that the lower the temperature is, the lower the relaxation capacity of the modified asphalt is; when the temperature is the same, the m value of the modified asphalt increases along with the increase of the addition amount of the modifier, which shows that the stress dissipation capability of the asphalt under the low-temperature condition can be enhanced by the addition of the furfural residue/illegal cooking oil composite modifier. According to the specification requirements of asphalt of Superpave in America, the S value of the asphalt material 60S is not more than 300MPa at the design temperature, and the m value is not less than 0.3, and the results of figures 5 and 6 show that the S value and the m value of the asphalt under the mixing amount of the four modifiers can meet the specification requirements at the temperature of-18 ℃; when the temperature is reduced to-24 ℃, the S value of the rest asphalt and the m value can reach the standard requirement except that the S value of the base asphalt and the modified asphalt with the addition amount of 4 percent are slightly lower than the standard requirement; when the temperature is continuously reduced to-30 ℃, the S value and the m value do not meet the requirements except the m value composite standard requirement of the asphalt doped with 12 percent of the modifier. The result shows that the furfural residue/illegal cooking oil composite modifier can improve the low-temperature crack resistance of asphalt, and the higher the doping amount of the modifier in a certain range, the better the low-temperature performance of the asphalt.
Fig. 7-9 are micro-topography diagrams of furfural residue, furfural residue/illegal cooking oil mixture, and furfural residue/illegal cooking oil mixture modified asphalt. As can be seen from fig. 7, the furfural residues are irregular in shape and uneven in size, the particle surfaces are rough, a lot of obvious grooves are seen, and after the furfural residues are mixed with the illegal cooking oil to prepare the biomass asphalt (fig. 8), the illegal cooking oil well infiltrates the furfural residues and forms a good interface with the furfural residues, and then after the furfural residues are mixed with the asphalt (fig. 9), the furfural residues are uniformly dispersed in the illegal cooking oil and asphalt systems, which shows that the furfural residues, the illegal cooking oil and the asphalt systems have good compatibility.
3 conclusion
1. The incorporation of the furfural residue/illegal cooking oil composite modifier can increase the penetration degree of asphalt cement and reduce the softening point of the asphalt cement, and the ductility value of the asphalt cement tends to increase firstly and then decrease along with the increase of the incorporation amount. Compared with asphalt which is independently doped with the illegal cooking oil and the furfural residues, the furfural residue/illegal cooking oil composite modifier is doped with the asphalt with the fluctuation range of three indexes lower, and after 8 percent of the furfural residue/illegal cooking oil composite modifier is doped, the three indexes can meet the standard requirement of No. 90 matrix asphalt.
2. The furfural residue/illegal cooking oil modified asphalt has good thermal storage stability, and when the mixing amount of the furfural residue/illegal cooking oil composite modifier is 8%, the thermal storage stability of the furfural residue/illegal cooking oil composite modifier for 72 hours can still meet the standard requirement.
3. The low-temperature crack resistance of the asphalt after the furfural residue/illegal cooking oil composite modifier is added is better than that of the matrix asphalt. Along with the increase of the mixing amount of the furfural residue/illegal cooking oil composite modifier, the creep rate of the asphalt is increased, the creep stiffness is reduced, the low-temperature stress relaxation performance is enhanced, and the low-temperature crack resistance of the asphalt is improved.
4. The furfural residues can be uniformly dispersed in a system of the illegal cooking oil and the asphalt, and the compatibility is good.
Claims (6)
1. The furfural residue/illegal cooking oil modified asphalt is characterized by comprising a furfural residue/illegal cooking oil composite modifier and asphalt, wherein the mass ratio of illegal cooking oil to furfural residue in the furfural residue/illegal cooking oil composite modifier is 1;
the preparation method of the furfural residue/illegal cooking oil modified asphalt comprises the following steps:
1. drying the furfural residues, putting into a crusher, crushing and screening by a 80-mesh screen;
2. mixing furfural residues and illegal cooking oil in a mass ratio of 1: 3, shearing at a rotating speed of 5000r/min for 15min, and filtering oil components by a 200-mesh filter screen to obtain a furfural residue/illegal cooking oil composite modifier, wherein the mass ratio of the illegal cooking oil to the furfural residues in the furfural residue/illegal cooking oil composite modifier is 1.125;
3. and (2) putting the furfural residue/illegal cooking oil composite modifier and asphalt in a drying oven at 140 ℃ for 2h, then pouring the furfural residue/illegal cooking oil composite modifier into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain the furfural residue/illegal cooking oil modified asphalt.
2. The furfural residue/illegal cooking oil modified asphalt of claim 1, characterized in that the asphalt model is 90# asphalt.
3. The method for preparing the furfural residue/illegal cooking oil modified asphalt as claimed in claim 1, wherein the method for preparing the furfural residue/illegal cooking oil modified asphalt is carried out according to the following steps:
1. drying the furfural residue, putting into a crusher, crushing, and screening with a 80-mesh screen;
2. mixing furfural residues and illegal cooking oil in a mass ratio of 1: 3, shearing at a rotating speed of 5000r/min for 15min, and filtering oil components by a 200-mesh filter screen to obtain a furfural residue/illegal cooking oil composite modifier, wherein the mass ratio of the illegal cooking oil to the furfural residues in the furfural residue/illegal cooking oil composite modifier is 1.125;
3. putting the furfural residue/illegal cooking oil composite modifier and asphalt in a baking oven at 140 ℃ for 2h, then pouring the furfural residue/illegal cooking oil composite modifier into the asphalt, shearing at 140 ℃ for 30min at the rotating speed of 5000r/min, then standing at 140 ℃ for 1h, taking out and cooling to obtain furfural residue/illegal cooking oil modified asphalt;
in the third step, the mass percentage of the furfural residue/illegal cooking oil composite modifier in the furfural residue/illegal cooking oil modified asphalt is 4-20%.
4. The method for preparing the furfural residue/illegal cooking oil modified asphalt according to claim 3, characterized in that the illegal cooking oil in the step one is brownish yellow, has a pH value of 6.8 and a density of 0.943 g-mL -1 。
5. The method for preparing the furfural residue/illegal cooking oil modified asphalt according to claim 3, wherein the furfural residue in the second step has a cellulose content of 47.63%, a hemicellulose content of 1.44%, a lignin content of 41.26% and an ash content of 4.4%.
6. The method for preparing the furfural residue/illegal cooking oil modified asphalt according to claim 3, characterized in that the asphalt type in the third step is 90# asphalt.
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| CN202111430998.5A CN113897070B (en) | 2021-11-29 | 2021-11-29 | Furfural residue/illegal cooking oil modified asphalt and preparation method thereof |
| PCT/CN2021/140272 WO2023092776A1 (en) | 2021-11-29 | 2021-12-22 | Furfural residue/illegal cooking oil modified asphalt and preparation method therefor |
| ZA2023/01925A ZA202301925B (en) | 2021-11-29 | 2023-02-16 | Furfural residue/used cooking oil modified asphalt and preparation method therefor |
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| BR112018010585B1 (en) * | 2015-11-24 | 2022-03-29 | Inbicon A/S | Bitumen compositions comprising lignin, use of a bitumen composition comprising lignin, sealing layer and asphalt composition |
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| US20180340068A1 (en) * | 2017-05-24 | 2018-11-29 | Alexander T. McCurdy | Vegetable oil and asphalt compositions and methods of using the same |
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| Title |
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| "废植物油再生沥青结合料性能研究";肖庆一等;《重庆交通大学学报(自然科学版)》;20210615;第40卷(第6期);第92-98、111页 * |
| "木质素改性沥青的制备及性能初探";吴文娟等;《纤维素科学与技术》;20170827;第25卷(第3期);第53-59页 * |
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