CN117247253A - High-temperature-resistant rutting-resistant asphalt concrete and preparation method thereof - Google Patents
High-temperature-resistant rutting-resistant asphalt concrete and preparation method thereof Download PDFInfo
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- CN117247253A CN117247253A CN202311170140.9A CN202311170140A CN117247253A CN 117247253 A CN117247253 A CN 117247253A CN 202311170140 A CN202311170140 A CN 202311170140A CN 117247253 A CN117247253 A CN 117247253A
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 150
- 239000010426 asphalt Substances 0.000 claims abstract description 31
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 19
- 239000011707 mineral Substances 0.000 claims abstract description 19
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000006028 limestone Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 239000003822 epoxy resin Substances 0.000 claims description 40
- 229920000647 polyepoxide Polymers 0.000 claims description 40
- 229920000141 poly(maleic anhydride) Polymers 0.000 claims description 37
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 29
- 239000002904 solvent Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 12
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229920002748 Basalt fiber Polymers 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 150000008064 anhydrides Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 125000003700 epoxy group Chemical group 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses high-temperature-resistant rutting-resistant asphalt concrete and a preparation method thereof, wherein the asphalt concrete is prepared from the following raw materials in parts by mass: 80-100 parts of limestone, 1-2 parts of mineral powder, 1-2 parts of cement, 5-10 parts of SBS modified asphalt and 0.2-1 part of high-strength mixed fiber, wherein the high-strength mixed fiber consists of modified PAN fibers and SiC whiskers. Compared with the prior art, the invention can further improve the strength and toughness of the asphalt concrete, and effectively solves the problem that the asphalt concrete in the prior art is easy to track at high temperature.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to high-temperature-resistant rutting-resistant asphalt concrete and a preparation method thereof.
Background
Road transportation is an important medium for transporting other industrial objects, and plays an increasingly important role and role in the whole national economy. The asphalt pavement is mainly paved by adopting asphalt concrete materials, and is favored in highway construction in China, especially in high-grade highway construction due to the advantages of flat and wear-resistant surface, small vibration, small noise, comfortable driving, simple maintenance and short construction period and the like. Along with the rapid improvement of the construction level of the infrastructure in China, the requirement on the mechanical properties of the asphalt concrete is also improved, so that the research on improving the mechanical properties of the asphalt concrete in recent years is attracting more and more attention.
At present, in order to prevent the rut resistance of asphalt concrete, most constructors add fibers into asphalt to strengthen the strength of the asphalt concrete, so that the rut resistance of the asphalt concrete is improved. The invention patent of 202211668728.2 discloses hot-mix epoxy asphalt concrete, a preparation method and application thereof, wherein basalt fibers are mainly added to improve the strength of the asphalt concrete. However, in actual construction and use, the asphalt concrete added with basalt fibers still easily generates rutting phenomenon when meeting high-temperature environment, so that the prior art still has the defects.
In view of this, the present applicant has made intensive studies with respect to the above problems, and has made the present invention.
Disclosure of Invention
The invention mainly aims to provide high-temperature-resistant rutting-resistant asphalt concrete and a preparation method thereof, which can further improve the strength and toughness of the asphalt concrete and effectively solve the problem that the asphalt concrete in the prior art is easy to generate rutting in a high-temperature environment.
In order to achieve the above object, the solution of the present invention is:
the high-temperature-resistant rutting-resistant asphalt concrete is prepared from the following raw materials in parts by mass: 80-100 parts of limestone, 1-2 parts of mineral powder, 1-2 parts of cement, 5-10 parts of SBS modified asphalt and 0.2-1 part of high-strength mixed fiber, wherein the high-strength mixed fiber consists of modified PAN fibers and SiC whiskers.
Further, the mass ratio of the modified PAN fiber to the SiC whisker in the high-strength mixed fiber is 2.5-3.5:1.
Further, the mass ratio of the modified PAN fiber to the SiC whisker in the high-strength mixed fiber is 3:1.
Further, the SiC whisker has a diameter of 5 to 10 μm and a length of 30 to 100 μm.
After the scheme is adopted, the modified PAN fiber has better oil absorption compared with basalt fiber added in the prior art, and the adhesiveness between asphalt, limestone, mineral powder and cement can be further improved by adding the modified PAN fiber, so that the overall strength and rutting resistance of asphalt concrete are improved. As proved by the adhesion test of the water boiling method, most of the asphalt film which is not doped with fibers is stripped by water, the asphalt film is partially reserved on the surface of the aggregate, and the stripping area percentage is more than 40%; and after the fibers are doped, a small part of the asphalt film is moved by water, and basically remains on the surface of the aggregate, and the stripping area percentage is less than 10%. The modified PAN fiber is shown to be capable of effectively improving the water stability of asphalt concrete. In addition, after the PAN fiber is modified, the PAN fiber is matched with the SiC whisker, so that the high temperature resistance and the compressive strength of the asphalt concrete are further improved, the high temperature resistance and the rutting resistance of the asphalt concrete are improved, and when the mass ratio of the modified PAN fiber to the SiC whisker is 3:1, the whisker aggregation phenomenon can be avoided.
Further, the modified PAN fiber is prepared by adding polymaleic anhydride modified epoxy resin into a solvent to obtain a mixed solution, immersing the PAN fiber into the mixed solution, and fully immersing and mixing to obtain the modified PAN fiber.
Further, the length of the PAN fiber is 6-12 mm.
Further, the PAN fibers have a length of 12mm.
Further, the mass volume ratio of the PAN fiber, the solvent and the polymaleic anhydride modified epoxy resin is as follows: 10g:100mL:0.3g.
Further, the solvent may be one of ethyl acetate, ethanol and acetone.
After the scheme is adopted, PAN fibers can be more oleophylic through the polymaleic anhydride modified epoxy resin, the polymaleic anhydride is an oligomer of maleic anhydride, 3-8 anhydride groups are contained in one molecule, the polymaleic anhydride can react with epoxy groups in the epoxy resin, and the affinity of the epoxy resin to the PAN fibers is increased. Compared with ethoxyepoxy resin, the polymaleic anhydride modified epoxy resin has better modification effect on PAN fibers, the water contact angle of the surface of the untreated PAN fibers is 118.13 degrees, the contact angle is obviously increased after the surface of the PAN fibers is treated by different types of modifiers, the water contact angle of the surface of the PAN fibers is increased to 130-135 degrees, and the water contact angle of the surface of the PAN fibers after the modification treatment of the polymaleic anhydride modified epoxy resin can be as high as 146-149 degrees, so that the modified PAN fibers have good affinity and dispersibility with asphalt, and meanwhile, the bonding property with asphalt can be better. In addition, after the polymaleic anhydride reacts with the epoxy resin, one reaction product contains a plurality of carboxyl groups, so that the polymaleic anhydride can be combined with SiC whisker and mineral aggregate, the adhesiveness of asphalt and the aggregate is further improved, and the strength and toughness and rutting resistance of asphalt concrete are effectively improved.
In addition, the indirect tensile strength of asphalt concrete doped with 0.3% of PAN fiber with the length of 6mm is increased by 25% compared with that of an undoped fiber test piece. The indirect tensile strength of the asphalt concrete doped with 0.3% of PAN fiber with the length of 12mm is increased by 30% compared with that of an undoped fiber test piece. Therefore, the indirect tensile property of the asphalt concrete can be improved to the maximum extent by selecting the PAN fiber with the length of 12mm, and the low-temperature cracking resistance of the asphalt concrete is improved. And when PAN fiber, the mass volume ratio of solvent and polymaleic anhydride modified epoxy resin is: 10g:100mL: at 0.3g, the asphalt concrete has the best strength, toughness and rut resistance.
The preparation method of the high-temperature-resistant rut-resistant asphalt concrete comprises the following steps:
(1) Adding the polymaleic anhydride modified epoxy resin into a solvent according to the mass-volume ratio, mixing, adding PAN fibers, and carrying out oscillation reaction for 2 hours at 70-80 ℃ to obtain modified PAN fibers;
(2) Mixing modified PAN fibers with SiC whiskers according to a mass ratio to obtain high-strength mixed fibers;
(3) The SBS modified asphalt is added into a heating and stirring device to be preheated to 120-140 ℃, limestone, mineral powder and cement are added according to the mass ratio, the mixture is heated to 180-190 ℃ to be fully stirred, then the mixture is cooled to 155-165 ℃, high-strength mixed fibers are added and fully stirred, and the asphalt concrete doped with PAN modified fibers and SiC whiskers is obtained.
Compared with the prior art, the beneficial effects are that:
compared with basalt fibers added in the prior art, the modified PAN fibers have better oil absorption, and the adhesion between asphalt and limestone, mineral powder and cement can be further improved by adding the modified PAN fibers, so that the overall strength, rutting resistance and water stability of asphalt concrete are improved.
Through the effect of the polymaleic anhydride modified epoxy resin, the SiC whisker can be matched with the modified PAN fiber, so that the mechanical property and the compressive strength of the asphalt concrete are further improved, the high temperature resistance and the rutting resistance of the asphalt concrete are improved, and when the mass ratio of the modified PAN fiber to the SiC whisker is 3:1, the whisker aggregation phenomenon can be avoided.
The PAN fiber can be more oleophylic through the polymaleic anhydride modified epoxy resin, and compared with the common modified epoxy resin, the polymaleic anhydride modified epoxy resin has a plurality of epoxy resin groups and a plurality of carboxyl groups in one molecule, has a better modification effect on the PAN fiber, so that the modified PAN fiber has better dispersibility, and meanwhile, the bonding property with asphalt can be better, the adhesiveness of asphalt and coarse materials is further improved, and the strength, the high temperature resistance and the rutting resistance of asphalt concrete are effectively improved.
Description of the embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.2 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 1 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 2.5:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3.5:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 6mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 100 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Examples
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) SiC whiskers with the diameter of 10 mu m and the length of 30 mu m are selected, and the modified PAN fibers and the SiC whiskers are mixed according to the mass ratio of 3:1 to obtain the high-strength mixed fibers.
(3) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of high-strength mixed fiber is added and fully stirred, and asphalt concrete added with modified PAN fiber and SiC whisker is obtained.
Comparative example 1
10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, and then the mixture is cooled to 160 ℃ and fully mixed, so that asphalt concrete without modified PAN fibers and SiC whiskers is obtained.
Comparative example 2
(1) PAN fiber with the length of 12mm is selected and used according to the mass volume ratio: 10g:100mL: preparing PAN fiber, solvent and polymaleic anhydride modified epoxy resin in 0.3g, adding the polymaleic anhydride modified epoxy resin into ethyl acetate solvent, mixing to obtain mixed solution, adding PAN fiber, and oscillating at 70-80 ℃ for 2h to obtain modified PAN fiber.
(2) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of modified PAN fiber is added and fully stirred, and asphalt concrete only added with the modified PAN fiber is obtained.
Comparative example 3
(1) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of SiC whisker with the whisker diameter of 10 mu m and the whisker length of 100 mu m is added, and the asphalt concrete added with only SiC whisker is obtained.
(2) 10 parts of SBS modified asphalt is added into a heating and stirring device to be preheated to 130 ℃, then 100 parts of limestone, 2 parts of mineral powder and 2 parts of cement are added, the mixture is heated to 185 ℃ to be fully stirred, then the mixture is cooled to 160 ℃, 0.5 part of SiC whisker with the whisker diameter of 10 mu m and the whisker length of 100 mu m are added and fully stirred, and the asphalt concrete with the SiC whisker is obtained.
Comparative example 4
The only difference from example 1 is that basalt fibers are used instead of PAN fibers.
Comparative example 5
The difference from example 1 is only the use of CaSO 4 Whisker replaces SiC whisker.
Comparative example 6
The only difference from example 1 is that an ethoxyepoxy resin is used instead of a polymaleic anhydride modified epoxy resin.
Marshall test and rutting test were performed on asphalt concretes prepared according to examples 1 to 7 and comparative examples 1 to 6 through experiments, and the detection results are recorded in the following table 1:
TABLE 1 stability and rutting resistance of asphalt concrete
In combination with the test data of Table 1, it can be seen that comparative examples 1 to 7 and comparative example 1 do not incorporate high strength blend fibers, whereas examples 1 to 7 in the inventive scheme are effective in enhancing the stability, overall strength and rutting resistance of asphalt concrete by incorporating high strength blend fibers. As can be seen from comparative examples 1 to 3, as the amount of the high-strength mixed fiber added increases, the strength and rut resistance of asphalt concrete are optimal when 0.5 parts of the high-strength mixed fiber is added, and when the amount of the high-strength mixed fiber added is too large, the fiber is liable to be knotted, and thus the strength is lowered. As can be seen from comparative examples 1, 4 and 5, when the mass ratio of the modified PAN fiber to the SiC whisker is 3:1, the strength and rut resistance of the asphalt concrete are optimal.
As can be seen from comparative examples 1 and 7 and comparative example 2, no SiC whisker was added in comparative example 2, whereas SiC whisker was added in examples 1 and 7, and the SiC whisker was capable of intertwining with the modified fiber, greatly improving the strength and rutting resistance of asphalt concrete, and further improving the high temperature stability and rutting resistance of asphalt concrete by adding SiC whisker. And as the length of the added SiC whiskers increases, the better the strength and rutting resistance of the asphalt concrete.
As can be seen from comparative examples 1 and 6 and comparative example 3, comparative example 3 was free from the addition of the modified PAN fiber, whereas examples 1 and 6 were added with the modified PAN fiber, the strength and rut resistance of the asphalt concrete could be further improved, and the longer the length of the PAN fiber used, the better the stability and rut resistance of the asphalt concrete.
As can be seen from comparative examples 1 and 4, the use of PAN fibers instead of basalt fibers in the prior art in the present invention can further improve the high temperature stability and rutting resistance of asphalt concrete. As can be seen from comparative example 1 and comparative example 5, the present invention scheme uses SiC whiskers instead of CaSO in the prior art 4 The whisker can enable the asphalt concrete to have better high temperature resistance, further improve the high temperature stability of asphalt, and greatly enhance the strength and rutting resistance of the asphalt concrete.
As can be seen from comparative examples 1 and 6, the polymaleic anhydride modified epoxy resin can make PAN fibers more oleophylic than other modifiers, and compared with general modified epoxy resin, the polymaleic anhydride modified epoxy resin has a better modification effect on PAN fibers because one molecule of the polymaleic anhydride modified epoxy resin contains a plurality of epoxy resin groups and a plurality of carboxyl groups, so that the modified PAN fibers have better dispersibility, and meanwhile, the bonding property with asphalt can be better, the adhesiveness of asphalt and coarse materials is further improved, and the strength, the high temperature resistance and the rutting resistance of asphalt concrete are effectively improved.
The above examples and results are not intended to limit the form or style of the product of the present invention, and any suitable changes or modifications made by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (10)
1. The high-temperature-resistant rutting-resistant asphalt concrete is characterized by being prepared from the following raw materials in parts by mass: 80-100 parts of limestone, 1-2 parts of mineral powder, 1-2 parts of cement, 5-10 parts of SBS modified asphalt and 0.2-1 part of high-strength mixed fiber, wherein the high-strength mixed fiber consists of modified PAN fibers and SiC whiskers.
2. The high-temperature-resistant rutting-resistant asphalt concrete according to claim 1, wherein the mass ratio of modified PAN fibers to SiC whiskers in the high-strength mixed fibers is 2.5-3.5:1.
3. The high temperature and rutting resistant asphalt concrete according to claim 2, wherein the mass ratio of modified PAN fibers to SiC whiskers in said high-strength mixed fibers is 3:1.
4. The high temperature and rutting resistant asphalt concrete according to claim 1, wherein said SiC whiskers have a diameter of 5 to 10 μm and a length of 30 to 100 μm.
5. The high temperature resistant rutting resistant asphalt concrete according to claim 1, wherein said modified PAN fibers are prepared by adding polymaleic anhydride modified epoxy resin to a solvent to obtain a mixed solution, immersing PAN fibers in the mixed solution, and fully immersing and mixing to obtain modified PAN fibers.
6. A high temperature and rutting resistant asphalt concrete according to claim 5, wherein said PAN fibers have a length of 6 to 12mm.
7. A high temperature and rutting resistant asphalt concrete according to claim 6, wherein said PAN fibers have a length of 12mm.
8. The high temperature and rutting resistant asphalt concrete according to claim 5, wherein the mass volume ratio of PAN fiber, solvent and polymaleic anhydride modified epoxy resin is: 10g:100mL:0.3g.
9. A high temperature and rut resistant asphalt concrete according to claim 5, wherein said solvent is one of ethyl acetate, ethanol and acetone.
10. A method for preparing the high temperature resistant rut resistant asphalt concrete according to any one of claims 1-9, comprising the steps of:
(1) Adding the polymaleic anhydride modified epoxy resin into a solvent according to the mass-volume ratio, mixing, adding PAN fibers, and carrying out oscillation reaction for 2 hours at 70-80 ℃ to obtain modified PAN fibers;
(2) Mixing modified PAN fibers with SiC whiskers according to a mass ratio to obtain high-strength mixed fibers;
(3) The SBS modified asphalt is added into a heating and stirring device to be preheated to 120-140 ℃, limestone, mineral powder and cement are added according to the mass ratio, the mixture is heated to 180-190 ℃ to be fully stirred, then the mixture is cooled to 155-165 ℃, high-strength mixed fibers are added and fully stirred, and the asphalt concrete added with PAN modified fibers and SiC whiskers is obtained.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311170140.9A CN117247253B (en) | 2023-09-12 | High-temperature-resistant rutting-resistant asphalt concrete and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311170140.9A CN117247253B (en) | 2023-09-12 | High-temperature-resistant rutting-resistant asphalt concrete and preparation method thereof |
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