CN111056768A - Low-temperature-resistant asphalt concrete and preparation method thereof - Google Patents
Low-temperature-resistant asphalt concrete and preparation method thereof Download PDFInfo
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- CN111056768A CN111056768A CN201911215996.7A CN201911215996A CN111056768A CN 111056768 A CN111056768 A CN 111056768A CN 201911215996 A CN201911215996 A CN 201911215996A CN 111056768 A CN111056768 A CN 111056768A
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- 239000011384 asphalt concrete Substances 0.000 title claims abstract description 79
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000010426 asphalt Substances 0.000 claims abstract description 201
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000000843 powder Substances 0.000 claims abstract description 26
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 25
- 239000011707 mineral Substances 0.000 claims abstract description 25
- 239000003365 glass fiber Substances 0.000 claims description 164
- 239000003822 epoxy resin Substances 0.000 claims description 90
- 229920000647 polyepoxide Polymers 0.000 claims description 90
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 69
- 239000007822 coupling agent Substances 0.000 claims description 66
- 239000003795 chemical substances by application Substances 0.000 claims description 61
- 238000003756 stirring Methods 0.000 claims description 56
- 239000004593 Epoxy Substances 0.000 claims description 46
- 239000000203 mixture Substances 0.000 claims description 34
- 238000010008 shearing Methods 0.000 claims description 34
- 238000004513 sizing Methods 0.000 claims description 30
- 239000011159 matrix material Substances 0.000 claims description 29
- 238000010438 heat treatment Methods 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 27
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- 238000000034 method Methods 0.000 claims description 23
- 229920002635 polyurethane Polymers 0.000 claims description 21
- 239000004814 polyurethane Substances 0.000 claims description 21
- 229920001400 block copolymer Polymers 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 16
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 229920000715 Mucilage Polymers 0.000 claims description 9
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
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- 238000012360 testing method Methods 0.000 description 36
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 30
- KZMGYPLQYOPHEL-UHFFFAOYSA-N Boron trifluoride etherate Chemical compound FB(F)F.CCOCC KZMGYPLQYOPHEL-UHFFFAOYSA-N 0.000 description 29
- -1 polysiloxane Polymers 0.000 description 28
- 229920001296 polysiloxane Polymers 0.000 description 26
- 238000006243 chemical reaction Methods 0.000 description 24
- 150000003505 terpenes Chemical class 0.000 description 18
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- 150000003077 polyols Chemical class 0.000 description 15
- UEEJHVSXFDXPFK-UHFFFAOYSA-N N-dimethylaminoethanol Chemical compound CN(C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 14
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 10
- 239000007864 aqueous solution Substances 0.000 description 10
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 10
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- 239000010935 stainless steel Substances 0.000 description 10
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 10
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- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 6
- FACXGONDLDSNOE-UHFFFAOYSA-N buta-1,3-diene;styrene Chemical compound C=CC=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 FACXGONDLDSNOE-UHFFFAOYSA-N 0.000 description 6
- 238000007654 immersion Methods 0.000 description 6
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- 239000002245 particle Substances 0.000 description 6
- NLRJUIXKEMCEOH-UHFFFAOYSA-N 3-fluoropropan-1-ol Chemical compound OCCCF NLRJUIXKEMCEOH-UHFFFAOYSA-N 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000010257 thawing Methods 0.000 description 3
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- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004841 bisphenol A epoxy resin Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
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- 238000009833 condensation Methods 0.000 description 2
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- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
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- 238000003786 synthesis reaction Methods 0.000 description 2
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- 235000019738 Limestone Nutrition 0.000 description 1
- UEEJHVSXFDXPFK-UHFFFAOYSA-O N-dimethylethanolamine Chemical compound C[NH+](C)CCO UEEJHVSXFDXPFK-UHFFFAOYSA-O 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- VYKXQOYUCMREIS-UHFFFAOYSA-N methylhexahydrophthalic anhydride Chemical compound C1CCCC2C(=O)OC(=O)C21C VYKXQOYUCMREIS-UHFFFAOYSA-N 0.000 description 1
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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
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses low-temperature-resistant asphalt concrete and a preparation method thereof. The low-temperature resistant asphalt concrete comprises the following substances: coarse aggregate, fine aggregate, mineral powder, asphalt and diatomite. The low-temperature-resistant asphalt concrete has outstanding ageing resistance and fatigue resistance, keeps good temperature resistance under the conditions of high temperature and low temperature, avoids cracking of the low-temperature concrete, has excellent fatigue resistance and loose crack resistance particularly in low-temperature seasons and climate alternating seasons in a seasonal freezing area or a cold area, prolongs the service life of the concrete, and is convenient to prepare.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to low-temperature-resistant asphalt concrete and a preparation method thereof.
Background
With the development of highway construction, asphalt concrete is widely used with its many advantages. However, with the obvious development and change of high speed, heavy load, large flow and canalization of modern traffic and the influence of climate conditions of special geographic environments, different forms of diseases appear on the asphalt pavement under the action of long-term vehicle load and temperature load, the traffic capacity and the driving comfort of vehicles of the road are influenced, and the service life of the road is shortened. The most common diseases of the asphalt pavement comprise water damage, shrinkage cracking, rutting and the like, in a freezing area in the north of China, due to the fact that the temperature changes greatly and the temperature difference changes in four seasons reach 70 ℃, the low-temperature crack of the asphalt pavement is common, and particularly, the rutting becomes a serious damage form of the asphalt pavement due to the increase of overload conditions in recent years. The asphalt surface layer is always in a freeze-thaw state, and the water damage phenomenon is serious. The problems to be solved are to prevent the early damage of the asphalt pavement, improve the use quality of the asphalt concrete material, enhance the pavement capacity of the asphalt concrete pavement and prolong the service life of the pavement.
Since the sixth and seventies of the last century, the application of asphalt concrete has been studied successively in the united states, the united kingdom, france, sweden, belgium, japan, india, australia, south africa and other countries.
At present, three major directions are generated for improving the mechanical property index of the asphalt concrete:
(1) improving the deformation-resistant mechanical parameters of asphalt concrete by improving aggregate gradation, such as open-graded wearing layer, multi-broken stone asphalt concrete, asphalt mastic concrete and the like;
(2) the cohesive force of asphalt concrete is improved by improving the performance of asphalt mortar, the bonding strength between aggregates is enhanced, and the shear resistance is improved, so that the permanent deformation resistance is improved, and the sensitivity of the asphalt mortar to temperature is reduced;
(3) the anti-deformation capacity of the asphalt concrete is improved by adding the reinforcing materials such as fibers and rubber powder into the asphalt concrete, the elastic performance is improved, the permanent deformation caused by viscous flow is reduced, and the low-temperature crack resistance of the asphalt concrete is improved to a certain extent along with the addition of the reinforcing materials.
Disclosure of Invention
In the prior art, the low-temperature cracking of asphalt concrete mainly has the following two damage reasons:
first, asphalt concrete temperature shrinkage caused by a sudden drop in air temperature generates cracks when the temperature stress generated inside the confined material structure exceeds the tensile strength of the material, and the cracks also develop from top to bottom.
Secondly, the asphalt concrete is subjected to long-time temperature cycle, so that the ultimate tensile strain of the asphalt concrete material is reduced, the stress relaxation performance is reduced along with the accumulation of temperature fatigue effect, and the asphalt concrete is cracked when the temperature stress is smaller than the tensile strength after fatigue.
The first purpose of the invention is to provide low temperature resistant asphalt concrete which can overcome low temperature cracking caused by the above reasons.
The invention discloses low-temperature-resistant asphalt concrete which comprises the following raw materials: coarse aggregate, fine aggregate, mineral powder, asphalt and diatomite.
The principle of the invention is as follows: the glass fiber has smooth surface and very limited bonding strength with asphalt; the particle size of the diatomite is small, the diatomite is wrapped on the surface of the asphalt, the performance of the asphalt cannot be influenced, and meanwhile, the viscosity of the asphalt mortar is increased due to the addition of the diatomite, so that the use performance of the asphalt concrete is enhanced, and the high-temperature stability and the low-temperature crack resistance of the asphalt concrete are improved; on the other hand, the diatomite and the glass fiber are compounded for modifying the asphalt, so that the tensile property of the glass fiber and the adsorption property of the diatomite can be fully exerted; in the asphalt concrete, the glass fiber and the diatomite particles form a network structure which takes the diatomite as nodes and the glass fiber as a chain lock, so that the bonding surface area of the glass fiber and the asphalt is effectively increased, the bonding strength of the glass fiber and an asphalt matrix is improved, the dissipation stress is effectively transmitted, and the purpose of common stress is achieved. The asphalt concrete obtained in this way can improve the high-temperature stability and simultaneously can improve the low-temperature crack resistance of the asphalt concrete.
Specifically, the low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 300-400 parts of coarse aggregate, 80-160 parts of fine aggregate, 40-50 parts of mineral powder, 30-35 parts of asphalt, 10-20 parts of diatomite and 2-4 parts of glass fiber.
As another preferable technical scheme of the invention, the low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 300-400 parts of coarse aggregate, 80-160 parts of fine aggregate, 40-50 parts of mineral powder, 30-35 parts of asphalt, 10-20 parts of diatomite and 2-4 parts of coupling agent treated glass fiber.
Further, the preparation process of the coupling agent treated glass fiber comprises the following steps: preparing a coupling agent aqueous solution with the mass fraction of the coupling agent of 2-5%; drying the glass fiber at 120-140 ℃ for 2-3 hours, adding the glass fiber into a high-speed stirrer, then adding a coupling agent aqueous solution, stirring the glass fiber for 2-5 minutes, and drying the glass fiber at 120-140 ℃ for 2-3 hours to obtain the coupling agent treated glass fiber.
Further, the preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5-3 g of tetraethoxysilane into 10-15 g of waterborne epoxy resin curing agent, and stirring for 15-30 minutes; then adding 0.3-1.2 g of coupling agent, and stirring for 10-20 minutes; finally, 10-15 g of the waterborne epoxy resin is added and stirred for 20-30 minutes; after stirring is finished, adding deionized water to dilute by 100-200 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: carrying out heat treatment on the glass fiber at 300-400 ℃ for 20-30 minutes; then uniformly winding the glass fiber after heat treatment on a frame, and placing the frame in acetone for ultrasonic cleaning for 1-3 hours, wherein the acetone is based on immersing the glass fiber; then, taking out the glass fiber, washing with water, and drying at 110-120 ℃; and soaking the dried glass fiber in a sizing agent for 10-20 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: (50-100) (g/mL), and then pulling the glass fiber at a speed of 1-2 mm/s; and finally, drying the pulled glass fiber at the temperature of 40-45 ℃ for 36-72 hours to obtain the coupling agent treated glass fiber.
In the above technical solution, the waterborne epoxy resin curing agent can be prepared by using a commercially available waterborne epoxy resin curing agent, such as a waterborne epoxy resin curing agent provided by zheng zhou boron limited chemical product, having a model number of CYDHD-220, or by referring to example one of patent application No. 201610215086.9.
In the above technical solution, the aqueous epoxy resin may be prepared by using a commercially available aqueous epoxy resin, such as the aqueous epoxy resin having the model number of CYDW-100 provided by zhengzhou boron chemical products ltd, or by referring to example three of patent application No. 201610451512.9.
In the prior art, a method of treating with a coupling agent is often used to form a firm interface bond between the resin and the glass fiber, but since the linear expansion coefficient difference between the resin and the glass fiber is very large, when the glass fiber treated with the coupling agent is used at high temperature, low temperature or a place with a large temperature difference, interface damage is easily generated. According to the invention, the glass fiber is subjected to sizing modification by the coupling agent, a hybrid material transition layer is formed between the glass fiber and the resin, and the interface damage caused by the difference of linear expansion coefficients between the glass fiber and the matrix in the application of occasions with high temperature, low temperature or large temperature difference can be relieved, so that the participation and reference for improving the temperature resistance of the glass fiber reinforced composite material are improved. According to the invention, the glass fiber is modified by using the waterborne epoxy resin/silicon dioxide hybrid sizing agent, and the film particle hybrid layer formed on the surface of the fiber increases the surface roughness of the glass fiber, so that the bonding property of the fiber and a matrix is improved; meanwhile, a transition layer is formed between the fiber and the epoxy resin, and because the linear expansion coefficient of the transition layer is between the fiber and the matrix, the interface damage degree generated when the glass fiber and the matrix are applied at high temperature, low temperature or occasions with large temperature difference due to overlarge linear expansion coefficient difference is relieved, and the interface bonding property between the glass fiber and the matrix is improved.
Further, the asphalt is matrix asphalt or epoxy asphalt.
Further, the preparation process of the epoxy asphalt comprises the following steps: heating the base asphalt to 160-175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1-3 hours at 2000-3000 r/min to obtain SBS segmented copolymer modified asphalt; adding epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring for 30-60 minutes at the temperature of 130-140 ℃ at 500-1000 rpm to obtain the epoxy asphalt.
The epoxy asphalt improves the flexibility of the epoxy asphalt through the styrene-butadiene-styrene copolymer, obviously improves the deformation adaptability of the epoxy asphalt, realizes the characteristic of high strength and good flexibility of the epoxy resin, and obviously reduces the cost of the epoxy asphalt, moreover, the compatilizer is used for reducing the interfacial tension between the epoxy resin and the asphalt, and the dispersion and the stability of the epoxy resin in the asphalt are improved, so that the epoxy resin and the asphalt form a uniform and stable mixture, thereby improving the compatibility between the epoxy resin and the asphalt.
Further, the epoxy asphalt comprises the following components: 100-200 parts of matrix asphalt, 9-20 parts of SBS block copolymer, 40-70 parts of epoxy resin, 15-30 parts of compatilizer and 32-50 parts of curing agent.
The epoxy resin for the epoxy asphalt is bisphenol A epoxy resin or polyurethane epoxy resin. Preferably, the epoxy resin is a polyurethane epoxy resin.
The preparation process of the polyurethane epoxy resin comprises the following steps: respectively adding 30-60 g of terpene-based epoxy resin and 10-20 g of neopentyl glycol into a four-necked bottle provided with a thermometer, a stirrer and a condenser, and heating to 80-90 ℃ under the condition of stirring; then adding an acetone solution of boron trifluoride diethyl etherate, wherein the acetone solution of boron trifluoride diethyl etherate is obtained by dissolving 0.3-0.6 g of boron trifluoride diethyl etherate in 2-3 g of acetone, heating to 100-110 ℃, and reacting for 1-2 hours at 100-110 ℃ under the condition of heat preservation to obtain terpene-based epoxy resin polyol; adding 1.5-3 g of 2, 2-bis (hydroxymethyl) propionic acid, 4-7.8 g of 2, 4-toluene diisocyanate and 7-15 g of acetone into another four-necked bottle provided with a thermometer, a stirrer and a condenser, heating to 50-55 ℃ under stirring, and carrying out heat preservation reaction at 50-55 ℃ for 2-3 hours to obtain an intermediate product; adding the intermediate product and 0.6-1.2 g of polysiloxane into 20-40 g of terpene-based epoxy resin polyol, and reacting for 2-4 hours at the temperature of 60-65 ℃; after the reaction is finished, adding an N, N-dimethylethanolamine aqueous solution into the reaction solution, wherein the N, N-dimethylethanolamine aqueous solution is obtained by mixing 1-2 g N N-dimethylethanolamine and 1-2 g of water, and fully mixing to obtain a polysiloxane modified epoxy resin polyol dispersion solution; 1, 6-hexyl diisocyanate and polysiloxane modified epoxy resin polyol dispersion liquid are mixed according to the mass ratio of 1: (15-20), uniformly mixing, adding water to dilute until the solid content is 30-40%, and curing at 110-120 ℃ for 5-6 hours to obtain the polyurethane epoxy resin.
Preferably, the polysiloxane is a mixture of hydroxypropyl fluorine-containing polysiloxane and α -hydrogen-omega-hydroxy-polydimethylsiloxane in a mass ratio of 1: 1.
The second technical problem to be solved by the invention is to provide a preparation method of low temperature resistant asphalt concrete.
The preparation method of the low temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively preserving the heat of the asphalt and the diatomite at the temperature of 130-140 ℃ for 4-6 hours; adding the heat-insulated diatomite into the heat-insulated asphalt, simultaneously shearing for 10-20 minutes at a high speed by using a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130-140 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and keeping the temperature at 160-165 ℃ for later use;
step two: respectively preserving the temperature of the coarse aggregate and the fine aggregate at 160-165 ℃ for 2-4 hours; mixing the heat-insulated coarse aggregate and fine aggregate for 25-35 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 30-40 seconds to obtain a diatomite modified asphalt mixture;
step three: carrying out heat preservation on glass fibers or glass fibers treated by a coupling agent for 4 hours at 160-165 ℃; adding the glass fiber subjected to heat preservation or the glass fiber treated by the coupling agent into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60-90 seconds; adding mineral powder, and stirring for 30-60 seconds to obtain the low-temperature resistant asphalt concrete.
Further, the shearing rotating speed of the first step is 500-600 revolutions per minute.
The low-temperature-resistant asphalt concrete has outstanding ageing resistance and fatigue resistance, keeps good temperature resistance under the conditions of high temperature and low temperature, avoids cracking of the low-temperature concrete, has excellent fatigue resistance and loose crack resistance particularly in low-temperature seasons and climate alternating seasons in a seasonal freezing area or a cold area, prolongs the service life of the concrete, and is convenient to prepare.
Detailed Description
The raw materials in the examples are as follows:
the coarse aggregate is basalt provided by Lingshou Haoyuan mineral product trade limited company, and has particle diameter of 7mm and specific gravity of 5g/cm 3.
The fine aggregate is limestone powder of 200 meshes provided by Jinhuo high temperature materials Co., Ltd, Zhengzhou city.
Mineral powder, offered by Handan City Peak Bangke trade company Limited, model number S95, in accordance with GB/T18046-2008.
Matrix asphalt, model No. 10, penetration 0.16mm, ductility 20cm, softening point 80 deg.C, and flash point 120 deg.C, available from Jinan Shuicho chemical Co., Ltd.
The diatomite is calcined diatomite provided by Shijiazhuang rhyme stone novel building materials Co.Ltd, 1250 meshes and model YS-800, the content of SiO2 is more than or equal to 65%, the content of Fe2O3 is less than or equal to 2.10%, the loss on ignition is less than or equal to 5%, the moisture content is less than or equal to 2%, the bulk density is less than or equal to 3g/cm3, the screen residue is less than or equal to 10%, the pH value is 7, and the specific surface area is 100m 2/g.
The glass fiber is chopped glass fiber provided by Jiangsu Kangdafu new material science and technology company, and has a length of 40mm and a diameter of 10 mm.
The waterborne epoxy resin curing agent is specifically a waterborne epoxy resin curing agent provided by Zhengzhou boron chemical product company Limited, and the model is CYDHD-220.
Tetraethoxysilane, CAS No.: 78-10-4.
Coupling agent KH550, CAS No.: 919-30-2.
The water-based epoxy resin is provided by Zhengzhou boron chemical product company Limited, and the model is CYDW-100.
Example 1
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of matrix asphalt, 20 parts of diatomite and 2 parts of glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the matrix asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated matrix asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: keeping the temperature of the glass fiber at 160 ℃ for 4 hours; adding the glass fiber after heat preservation into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
Example 2
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of matrix asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the coupling agent treated glass fiber comprises the following steps: preparing a coupling agent aqueous solution with the mass fraction of KH550 of the coupling agent of 2 percent; and drying the glass fiber at 120 ℃ for 2 hours, adding the glass fiber into a high-speed stirrer, then adding a coupling agent aqueous solution, stirring the glass fiber at 300 revolutions per minute for 2 minutes, and drying the glass fiber at 120 ℃ for 2 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the matrix asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated matrix asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
Example 3
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of matrix asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5g of tetraethoxysilane into 10g of waterborne epoxy resin curing agent, and stirring for 30 minutes at 100 revolutions per minute; then adding 0.3g of coupling agent KH550, and stirring for 10 minutes at 100 revolutions per minute; finally, 10g of the waterborne epoxy resin is added dropwise at the speed of 0.3g/min and stirred for 30 minutes at 100 revolutions/min; after stirring is finished, adding deionized water to dilute 100 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: heat-treating the glass fiber at 400 ℃ for 30 minutes; then uniformly winding the glass fiber after heat treatment on a stainless steel frame, placing the stainless steel frame in acetone for ultrasonic cleaning for 3 hours, wherein the ultrasonic power is 300W, the ultrasonic frequency is 25kHz, and the acetone is subject to immersion of the glass fiber; then, taking out the glass fiber, washing the glass fiber by using deionized water with the weight of 200 times of the glass fiber, and drying the glass fiber for 2 hours at 120 ℃; and (3) soaking the dried glass fiber in a sizing agent for 10 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: 60(g/mL), and then pulling the glass fiber at 1 mm/s; and finally, drying the drawn glass fiber at 40 ℃ for 72 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the matrix asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated matrix asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
Example 4
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of epoxy asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the epoxy asphalt comprises the following steps: heating the base asphalt to 175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1 hour at 3000 r/min to obtain SBS segmented copolymer modified asphalt; adding bisphenol A epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring at 130 ℃ at 500 rpm for 60 minutes to obtain the epoxy asphalt. Wherein the epoxy asphalt comprises the following components: 100 parts of matrix asphalt, 9 parts of SBS block copolymer, 40 parts of bisphenol A type epoxy resin, 15 parts of compatilizer and 32 parts of curing agent.
The preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5g of tetraethoxysilane into 10g of waterborne epoxy resin curing agent, and stirring for 30 minutes at 100 revolutions per minute; then adding 0.3g of coupling agent KH550, and stirring for 10 minutes at 100 revolutions per minute; finally, 10g of the waterborne epoxy resin is added dropwise at the speed of 0.3g/min and stirred for 30 minutes at 100 revolutions/min; after stirring is finished, adding deionized water to dilute 100 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: heat-treating the glass fiber at 400 ℃ for 30 minutes; then uniformly winding the glass fiber after heat treatment on a stainless steel frame, placing the stainless steel frame in acetone for ultrasonic cleaning for 3 hours, wherein the ultrasonic power is 300W, the ultrasonic frequency is 25kHz, and the acetone is subject to immersion of the glass fiber; then, taking out the glass fiber, washing the glass fiber by using deionized water with the weight of 200 times of the glass fiber, and drying the glass fiber for 2 hours at 120 ℃; and (3) soaking the dried glass fiber in a sizing agent for 10 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: 60(g/mL), and then pulling the glass fiber at 1 mm/s; and finally, drying the drawn glass fiber at 40 ℃ for 72 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the epoxy asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated epoxy asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
The raw materials for preparing the epoxy asphalt are as follows:
matrix asphalt, model No. 10, penetration 0.16mm, ductility 20cm, softening point 80 deg.C, and flash point 120 deg.C, available from Jinan Shuicho chemical Co., Ltd.
As the bisphenol A type epoxy resin, E-51 bisphenol A type epoxy resin supplied from the Baoling corporation is specifically used.
SBS block copolymer, namely styrene-butadiene-styrene ternary block copolymer, produced by Yueyang petrochemical company, Hunan, model is YH-791.
The compatibilizer, prepared in accordance with example one of patent application No. 98811107.1.
As the curing agent, methylhexahydrophthalic anhydride curing agent, CAS No.: 2550-51-0.
Example 5
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of epoxy asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the epoxy asphalt comprises the following steps: heating the base asphalt to 175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1 hour at 3000 r/min to obtain SBS segmented copolymer modified asphalt; adding polyurethane epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring at 130 ℃ at 500 rpm for 60 minutes to obtain the epoxy asphalt. Wherein the epoxy asphalt comprises the following components: 100 parts of matrix asphalt, 9 parts of SBS block copolymer, 40 parts of polyurethane epoxy resin, 15 parts of compatilizer and 32 parts of curing agent.
The preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5g of tetraethoxysilane into 10g of waterborne epoxy resin curing agent, and stirring for 30 minutes at 100 revolutions per minute; then adding 0.3g of coupling agent KH550, and stirring for 10 minutes at 100 revolutions per minute; finally, 10g of the waterborne epoxy resin is added dropwise at the speed of 0.3g/min and stirred for 30 minutes at 100 revolutions/min; after stirring is finished, adding deionized water to dilute 100 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: heat-treating the glass fiber at 400 ℃ for 30 minutes; then uniformly winding the glass fiber after heat treatment on a stainless steel frame, placing the stainless steel frame in acetone for ultrasonic cleaning for 3 hours, wherein the ultrasonic power is 300W, the ultrasonic frequency is 25kHz, and the acetone is subject to immersion of the glass fiber; then, taking out the glass fiber, washing the glass fiber by using deionized water with the weight of 200 times of the glass fiber, and drying the glass fiber for 2 hours at 120 ℃; and (3) soaking the dried glass fiber in a sizing agent for 10 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: 60(g/mL), and then pulling the glass fiber at 1 mm/s; and finally, drying the drawn glass fiber at 40 ℃ for 72 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the epoxy asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated epoxy asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
The preparation process of the polyurethane epoxy resin comprises the following steps: respectively adding 60g of terpene-based epoxy resin and 20g of neopentyl glycol into a four-necked bottle provided with a thermometer, a stirrer and a condenser, and heating to 90 ℃ at the speed of 5 ℃/min under the condition of stirring at 80 revolutions per minute; then adding an acetone solution of boron trifluoride diethyl etherate, wherein the acetone solution of boron trifluoride diethyl etherate is obtained by dissolving 0.6g of boron trifluoride diethyl etherate in 3g of acetone, heating to 110 ℃ at the speed of 5 ℃/min, and carrying out heat preservation reaction at the temperature of 110 ℃ for 1 hour to obtain terpene-based epoxy resin polyol; adding 3g of 2, 2-bis (hydroxymethyl) propionic acid, 7.8g of 2, 4-toluene diisocyanate and 15g of acetone into another four-necked flask provided with a thermometer, a stirrer and a condenser, heating to 55 ℃ at the speed of 5 ℃/min under the stirring condition of 80 revolutions per minute, and carrying out heat preservation reaction at the temperature of 55 ℃ for 3 hours to obtain an intermediate product; adding the intermediate product and 1.2g of polysiloxane into 40g of terpene-based epoxy resin polyol, and reacting for 4 hours at 65 ℃ under the condition of heat preservation; after the reaction is finished, adding an N, N-dimethylethanolamine aqueous solution into the reaction solution, wherein the N, N-dimethylethanolamine aqueous solution is obtained by mixing 2g N, N-dimethylethanolamine and 2g of water, and fully and uniformly mixing to obtain polysiloxane modified epoxy resin polyol dispersion liquid; 1, 6-hexyl diisocyanate and polysiloxane modified epoxy resin polyol dispersion liquid are mixed according to the mass ratio of 1: 20, uniformly mixing, adding water to dilute until the solid content is 40%, and curing for 6 hours at 120 ℃ to obtain the polyurethane epoxy resin.
The epoxy asphalt and polyurethane epoxy resin are prepared from the following raw materials:
matrix asphalt, model No. 10, penetration 0.16mm, ductility 20cm, softening point 80 deg.C, and flash point 120 deg.C, available from Jinan Shuicho chemical Co., Ltd.
SBS block copolymer, namely styrene-butadiene-styrene ternary block copolymer, produced by Yueyang petrochemical company, Hunan, model is YH-791.
The compatibilizer, prepared in accordance with example one of patent application No. 98811107.1.
Specifically, a terpene-based amine epoxy resin cured product was used as the curing agent, and the curing agent was prepared by referring to example one of patent application No. 201310591581.6.
Terpene-based epoxy resin, prepared by reference to example one of patent application No. 200710021802.0.
Neopentyl glycol, CAS No.: 126-30-7.
Boron trifluoride diethyl etherate, CAS No.: 109-63-7.
Acetone, CAS No.: 67-64-1.
2, 2-bis (hydroxymethyl) propionic acid, CAS No.: 4767-03-7.
2, 4-toluene diisocyanate, CAS No.: 584-84-9.
The polysiloxane specifically uses hydroxypropyl fluorine-containing polysiloxane, and the specific reaction conditions refer to synthesis of terminal hydroxypropyl fluorine-containing polysiloxane and modified waterborne polyurethane performance (hong nations, journal of textile, volume 35, phase 12): the dosage of the side reaction inhibitor is 0.2 percent, the mass concentration of the catalyst is 60mg/L, the reaction temperature is 75 ℃, and the reaction time is 4 hours.
N, N-dimethylethanolamine, CAS No.: 108-01-0.
1, 6-hexyl diisocyanate, CAS No.: 822-06-0.
Example 6
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of epoxy asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the epoxy asphalt comprises the following steps: heating the base asphalt to 175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1 hour at 3000 r/min to obtain SBS segmented copolymer modified asphalt; adding polyurethane epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring at 130 ℃ at 500 rpm for 60 minutes to obtain the epoxy asphalt. Wherein the epoxy asphalt comprises the following components: 100 parts of matrix asphalt, 9 parts of SBS block copolymer, 40 parts of polyurethane epoxy resin, 15 parts of compatilizer and 32 parts of curing agent.
The preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5g of tetraethoxysilane into 10g of waterborne epoxy resin curing agent, and stirring for 30 minutes at 100 revolutions per minute; then adding 0.3g of coupling agent KH550, and stirring for 10 minutes at 100 revolutions per minute; finally, 10g of the waterborne epoxy resin is added dropwise at the speed of 0.3g/min and stirred for 30 minutes at 100 revolutions/min; after stirring is finished, adding deionized water to dilute 100 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: heat-treating the glass fiber at 400 ℃ for 30 minutes; then uniformly winding the glass fiber after heat treatment on a stainless steel frame, placing the stainless steel frame in acetone for ultrasonic cleaning for 3 hours, wherein the ultrasonic power is 300W, the ultrasonic frequency is 25kHz, and the acetone is subject to immersion of the glass fiber; then, taking out the glass fiber, washing the glass fiber by using deionized water with the weight of 200 times of the glass fiber, and drying the glass fiber for 2 hours at 120 ℃; and (3) soaking the dried glass fiber in a sizing agent for 10 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: 60(g/mL), and then pulling the glass fiber at 1 mm/s; and finally, drying the drawn glass fiber at 40 ℃ for 72 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the epoxy asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated epoxy asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
The preparation process of the polyurethane epoxy resin comprises the following steps: respectively adding 60g of terpene-based epoxy resin and 20g of neopentyl glycol into a four-necked bottle provided with a thermometer, a stirrer and a condenser, and heating to 90 ℃ at the speed of 5 ℃/min under the condition of stirring at 80 revolutions per minute; then adding an acetone solution of boron trifluoride diethyl etherate, wherein the acetone solution of boron trifluoride diethyl etherate is obtained by dissolving 0.6g of boron trifluoride diethyl etherate in 3g of acetone, heating to 110 ℃ at the speed of 5 ℃/min, and carrying out heat preservation reaction at the temperature of 110 ℃ for 1 hour to obtain terpene-based epoxy resin polyol; adding 3g of 2, 2-bis (hydroxymethyl) propionic acid, 7.8g of 2, 4-toluene diisocyanate and 15g of acetone into another four-necked flask provided with a thermometer, a stirrer and a condenser, heating to 55 ℃ at the speed of 5 ℃/min under the stirring condition of 80 revolutions per minute, and carrying out heat preservation reaction at the temperature of 55 ℃ for 3 hours to obtain an intermediate product; adding the intermediate product and 1.2g of polysiloxane into 40g of terpene-based epoxy resin polyol, and reacting for 4 hours at 65 ℃ under the condition of heat preservation; after the reaction is finished, adding an N, N-dimethylethanolamine aqueous solution into the reaction solution, wherein the N, N-dimethylethanolamine aqueous solution is obtained by mixing 2g N, N-dimethylethanolamine and 2g of water, and fully and uniformly mixing to obtain polysiloxane modified epoxy resin polyol dispersion liquid; 1, 6-hexyl diisocyanate and polysiloxane modified epoxy resin polyol dispersion liquid are mixed according to the mass ratio of 1: 20, uniformly mixing, adding water to dilute until the solid content is 40%, and curing for 6 hours at 120 ℃ to obtain the polyurethane epoxy resin.
The epoxy asphalt and polyurethane epoxy resin are prepared from the following raw materials:
matrix asphalt, model No. 10, penetration 0.16mm, ductility 20cm, softening point 80 deg.C, and flash point 120 deg.C, available from Jinan Shuicho chemical Co., Ltd.
SBS block copolymer, namely styrene-butadiene-styrene ternary block copolymer, produced by Yueyang petrochemical company, Hunan, model is YH-791.
The compatibilizer, prepared in accordance with example one of patent application No. 98811107.1.
Specifically, a terpene-based amine epoxy resin cured product was used as the curing agent, and the curing agent was prepared by referring to example one of patent application No. 201310591581.6.
Terpene-based epoxy resin, prepared by reference to example one of patent application No. 200710021802.0.
Neopentyl glycol, CAS No.: 126-30-7.
Boron trifluoride diethyl etherate, CAS No.: 109-63-7.
Acetone, CAS No.: 67-64-1.
2, 2-bis (hydroxymethyl) propionic acid, CAS No.: 4767-03-7.
2, 4-toluene diisocyanate, CAS No.: 584-84-9.
As the polysiloxane, α -hydro- ω -hydroxy-polydimethylsiloxane having CAS number 70131-67-8 was used.
N, N-dimethylethanolamine, CAS No.: 108-01-0.
1, 6-hexyl diisocyanate, CAS No.: 822-06-0.
Example 7
The low-temperature resistant asphalt concrete is prepared from the following raw materials in parts by weight: 400 parts of coarse aggregate, 150 parts of fine aggregate, 40 parts of mineral powder, 30 parts of epoxy asphalt, 20 parts of diatomite and 2 parts of coupling agent treated glass fiber.
The preparation process of the epoxy asphalt comprises the following steps: heating the base asphalt to 175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1 hour at 3000 r/min to obtain SBS segmented copolymer modified asphalt; adding polyurethane epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring at 130 ℃ at 500 rpm for 60 minutes to obtain the epoxy asphalt. Wherein the epoxy asphalt comprises the following components: 100 parts of matrix asphalt, 9 parts of SBS block copolymer, 40 parts of polyurethane epoxy resin, 15 parts of compatilizer and 32 parts of curing agent.
The preparation process of the coupling agent treated glass fiber comprises the following steps:
(1) preparing a sizing agent: adding 1.5g of tetraethoxysilane into 10g of waterborne epoxy resin curing agent, and stirring for 30 minutes at 100 revolutions per minute; then adding 0.3g of coupling agent KH550, and stirring for 10 minutes at 100 revolutions per minute; finally, 10g of the waterborne epoxy resin is added dropwise at the speed of 0.3g/min and stirred for 30 minutes at 100 revolutions/min; after stirring is finished, adding deionized water to dilute 100 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: heat-treating the glass fiber at 400 ℃ for 30 minutes; then uniformly winding the glass fiber after heat treatment on a stainless steel frame, placing the stainless steel frame in acetone for ultrasonic cleaning for 3 hours, wherein the ultrasonic power is 300W, the ultrasonic frequency is 25kHz, and the acetone is subject to immersion of the glass fiber; then, taking out the glass fiber, washing the glass fiber by using deionized water with the weight of 200 times of the glass fiber, and drying the glass fiber for 2 hours at 120 ℃; and (3) soaking the dried glass fiber in a sizing agent for 10 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: 60(g/mL), and then pulling the glass fiber at 1 mm/s; and finally, drying the drawn glass fiber at 40 ℃ for 72 hours to obtain the coupling agent treated glass fiber.
The preparation method of the low-temperature resistant asphalt concrete comprises the following steps:
the method comprises the following steps: respectively keeping the temperature of the epoxy asphalt and the diatomite at 130 ℃ for 6 hours; adding the heat-insulated diatomite into the heat-insulated epoxy asphalt, simultaneously shearing for 10 minutes at a high speed of 550 revolutions per minute by adopting a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and preserving the heat at 160 ℃ for later use;
step two: respectively keeping the temperature of the coarse aggregate and the fine aggregate at 160 ℃ for 2 hours; mixing the heat-preserved coarse aggregate and fine aggregate for 25 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 40 seconds to obtain a diatomite modified asphalt mixture;
step three: the coupling agent treated glass fiber is insulated for 4 hours at 160 ℃; adding the heat-preserved coupling agent treated glass fiber into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60 seconds; adding mineral powder, and stirring for 30 seconds to obtain the low-temperature resistant asphalt concrete.
The preparation process of the polyurethane epoxy resin comprises the steps of respectively adding 60g of terpene-based epoxy resin and 20g of neopentyl glycol into a four-necked flask provided with a thermometer, a stirrer and a condensation tube, heating to 90 ℃ at 5 ℃/min under the condition of stirring at 80 revolutions per minute, then adding an acetone solution of boron trifluoride diethyl ether, dissolving 0.6g of boron trifluoride diethyl ether in 3g of acetone to obtain the acetone solution, heating to 110 ℃ at 5 ℃/min, carrying out heat preservation reaction at 110 ℃ for 1 hour to obtain terpene-based epoxy resin polyol, adding 3g of 2, 2-bis (hydroxymethyl) propionic acid, 7.8g of 2, 4-toluene diisocyanate and 15g of acetone into another four-necked flask provided with a thermometer, a stirrer and a condensation tube, carrying out heat preservation reaction at 55 ℃ for 3 hours under the condition of stirring at 80 revolutions per minute to obtain an intermediate product, adding 1.2g of the terpene-based epoxy resin polyol into 40g of the polysiloxane, heating to 55 ℃ at 5 ℃/min under the condition of stirring at 80 revolutions per minute, carrying out heat preservation reaction for 3 hours to obtain the intermediate product, adding 1.2g of the intermediate product and 1.2-4-dimethyl polysiloxane-modified polysiloxane into 40g of epoxy resin polyol, adding water to obtain a mixture, carrying out a reaction, carrying out a homogeneous reaction, adding a mixture of modified polysiloxane and carrying out a reaction on a mixture of modified polysiloxane and a mixture of a polysiloxane, wherein the mixture of a polysiloxane and a polysiloxane, the mixture of a polysiloxane-modified polysiloxane, and a polysiloxane, carrying out a reaction, and a reaction on a reaction, and a.
The epoxy asphalt and polyurethane epoxy resin are prepared from the following raw materials:
matrix asphalt, model No. 10, penetration 0.16mm, ductility 20cm, softening point 80 deg.C, and flash point 120 deg.C, available from Jinan Shuicho chemical Co., Ltd.
SBS block copolymer, namely styrene-butadiene-styrene ternary block copolymer, produced by Yueyang petrochemical company, Hunan, model is YH-791.
The compatibilizer, prepared in accordance with example one of patent application No. 98811107.1.
Specifically, a terpene-based amine epoxy resin cured product was used as the curing agent, and the curing agent was prepared by referring to example one of patent application No. 201310591581.6.
Terpene-based epoxy resin, prepared by reference to example one of patent application No. 200710021802.0.
Neopentyl glycol, CAS No.: 126-30-7.
Boron trifluoride diethyl etherate, CAS No.: 109-63-7.
Acetone, CAS No.: 67-64-1.
2, 2-bis (hydroxymethyl) propionic acid, CAS No.: 4767-03-7.
2, 4-toluene diisocyanate, CAS No.: 584-84-9.
The hydroxypropyl fluorine-containing polysiloxane refers to the synthesis of terminal hydroxypropyl fluorine-containing polysiloxane and the performance of modified waterborne polyurethane thereof (hong nations, journal of textile, volume 35, phase 12), and the specific reaction conditions are as follows: the dosage of the side reaction inhibitor is 0.2 percent, the mass concentration of the catalyst is 60mg/L, the reaction temperature is 75 ℃, and the reaction time is 4 hours.
α -hydro-omega-hydroxy-polydimethylsiloxane CAS No. 70131-67-8.
N, N-dimethylethanolamine, CAS No.: 108-01-0.
1, 6-hexyl diisocyanate, CAS No.: 822-06-0.
Effect example 1
And (3) carrying out low-temperature crack resistance measurement on the low-temperature resistant asphalt concrete obtained in the embodiment 1-7: the method is carried out according to T0716-1993 asphalt mixture splitting test in road engineering asphalt and asphalt mixture test procedure (JIT 052-2000). The test temperature was-10 ℃ and the loading rate was 1 mm/min. The adopted loading equipment is an MTS testing machine provided by Shanghai Baihe instrument science and technology limited, the testing clamp is a special splitting test clamp with a pressing strip, the width of the pressing strip is 12.7mm, and the radius of curvature of the inner side of the pressing strip is 50.8 mm.
Tensile strain at failure εTCalculated according to equation (1).
εT＝XT×(0.0307+0.0936μ)/(1.35+5μ)；(1)
In the formula (I), the compound is shown in the specification,
εT-breaking tensile strain of the small marshall test piece;
mu-poisson ratio, when the test temperature is-10 ℃, mu is 0.25;
XT-total deformation in the horizontal direction relative to the maximum breaking load, mm; xTCalculated according to the following formula: xT＝YT×(0.0135+0.5μ)/(1.794-0.0314μ)；YTTotal deformation in the vertical direction, mm, of the small marshall test piece corresponding to the maximum breaking load.
The specific test results are shown in table 1.
TABLE 1 Low temperature crack resistance test results table
| Breaking tensile strain | |
| Example 1 | 3305 |
| Example 2 | 3464 |
| Example 3 | 3580 |
| Example 4 | 3627 |
| Example 5 | 3800 |
| Example 6 | 3816 |
| Example 7 | 3971 |
The principle of the invention is as follows: the glass fiber has smooth surface and very limited bonding strength with asphalt; the particle size of the diatomite is small, the diatomite is wrapped on the surface of the asphalt, the performance of the asphalt cannot be influenced, and meanwhile, the viscosity of the asphalt mortar is increased due to the addition of the diatomite, so that the use performance of the asphalt concrete is enhanced, and the high-temperature stability and the low-temperature crack resistance of the asphalt concrete are improved; on the other hand, the diatomite and the glass fiber are compounded for modifying the asphalt, so that the tensile property of the glass fiber and the adsorption property of the diatomite can be fully exerted; in the asphalt concrete, the glass fiber and the diatomite particles form a network structure which takes the diatomite as nodes and the glass fiber as a chain lock, so that the bonding surface area of the glass fiber and the asphalt is effectively increased, the bonding strength of the glass fiber and an asphalt matrix is improved, the dissipation stress is effectively transmitted, and the purpose of common stress is achieved. The asphalt concrete obtained in this way can improve the high-temperature stability and simultaneously can improve the low-temperature crack resistance of the asphalt concrete.
As can be seen from Table 1, the low temperature cracking resistance of the low temperature resistant asphalt concrete is improved in examples 4 to 7 compared with examples 1 to 3, and it is presumed that the voids between the base asphalt and the aggregate are filled by the addition of the epoxy asphalt, and the aggregate, the base asphalt and the epoxy resin are subjected to the load and stress together.
Test example 2
The low-temperature impact toughness test is carried out on the low-temperature resistant asphalt concrete of the embodiment 1-7: the trabecular test piece cut by the rut plate is a prism body with the length of 250mm +/-2.0 mm, the width of 30mm +/-2.0 mm and the height of 35mm +/-2.0 mm, and bears impact load in the height direction, and the test temperature is-10 ℃. The impact toughness ak is calculated by equation (2).
ak＝Ak/F；(2)
In the formula: ak-impact toughness of asphalt concrete, J/cm2；
Ak-impact energy consumed by breaking a test piece, J;
cross-sectional area of F-specimen, cm2；
The specific test results are shown in table 2.
TABLE 2 Low temperature impact toughness test results table
Table 2 shows that the low temperature resistant asphalt concrete of the invention is less affected by temperature change under low temperature conditions and has better low temperature crack resistance.
Effect example 3
The low-temperature resistant asphalt concrete obtained in examples 1 to 7 was subjected to a water stability test: according to the requirements of road engineering asphalt and asphalt mixture test procedure T0709-2000 asphalt mixture Marshall stability test. The test conditions were 60 ℃ water bath immersion for 1 hour. The test loading rate was 50 mm/min.
The specific test results are shown in table 3.
Table 3 table of test results of water stability test
In the embodiments 4-7, the epoxy asphalt of the present invention improves the flexibility of the epoxy asphalt through the styrene-butadiene-styrene copolymer, significantly improves the deformation adaptability of the epoxy asphalt, realizes the characteristics of high strength and good flexibility of the epoxy resin, and significantly reduces the cost of the epoxy asphalt, furthermore, the compatibilizer is used to reduce the interfacial tension between the epoxy resin and the asphalt, and improve the dispersion and stability of the epoxy resin in the asphalt, so that the epoxy resin and the asphalt form a uniform and stable mixture, thereby improving the compatibility between the epoxy resin and the asphalt.
Effect example 4
Carrying out a freeze-thaw splitting test on the low-temperature resistant asphalt concrete of the embodiment 1-7: the method is completed according to a T0729-2000 asphalt mixture freeze-thaw splitting test in road engineering asphalt and asphalt mixture test procedures (JIT 052-2000). The test piece adopted in the test is a small Marshall test piece which is subjected to double-sided compaction for 75 times respectively, the size of the test piece is phi 101.6mm multiplied by 63.5mm, the test temperature is 25 ℃, and the loading rate is 50 mm/min. The test instrument adopts a road strength meter, the test fixture is a special splitting test fixture with a pressing strip, the width of the pressing strip is 12.7mm, and the radius of curvature of the inner side is 50.8 mm.
TSR＝RT2/RT1×100％；
In the formula: TSR-freeze-thaw cleavage strength ratio,%;
RT2the splitting strength of the test piece after freeze thawing splitting is MPa;
RT1the splitting strength of the test piece before freeze thawing splitting is MPa.
The specific test results are shown in table 4.
Table 4 test results of freeze thawing splitting test
It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.
Claims (10)
1. The low-temperature resistant asphalt concrete is characterized by comprising the following raw materials: coarse aggregate, fine aggregate, mineral powder, asphalt and diatomite.
2. The low-temperature-resistant asphalt concrete according to claim 1, which is prepared from the following raw materials in parts by weight: 300-400 parts of coarse aggregate, 80-160 parts of fine aggregate, 40-50 parts of mineral powder, 30-35 parts of asphalt, 10-20 parts of diatomite and 2-4 parts of glass fiber.
3. The low-temperature-resistant asphalt concrete according to claim 1, which is prepared from the following raw materials in parts by weight: 300-400 parts of coarse aggregate, 80-160 parts of fine aggregate, 40-50 parts of mineral powder, 30-35 parts of asphalt, 10-20 parts of diatomite and 2-4 parts of coupling agent treated glass fiber.
4. The low temperature resistant asphalt concrete according to claim 3, wherein the coupling agent treated glass fiber is prepared by the following steps:
(1) preparing a sizing agent: adding 1.5-3 g of tetraethoxysilane into 10-15 g of waterborne epoxy resin curing agent, and stirring for 15-30 minutes; then adding 0.3-1.2 g of coupling agent, and stirring for 10-20 minutes; finally, 10-15 g of the waterborne epoxy resin is added and stirred for 20-30 minutes; after stirring is finished, adding deionized water to dilute by 100-200 times according to the mass to obtain the sizing agent;
(2) glass fiber coupling agent treatment: carrying out heat treatment on the glass fiber at 300-400 ℃ for 20-30 minutes; then uniformly winding the glass fiber after heat treatment on a frame, and placing the frame in acetone for ultrasonic cleaning for 1-3 hours, wherein the acetone is based on immersing the glass fiber; then, taking out the glass fiber, washing with water, and drying at 110-120 ℃; and soaking the dried glass fiber in a sizing agent for 10-20 minutes, wherein the solid-to-liquid ratio of the glass fiber to the sizing agent is 1: (50-100) (g/mL), and then pulling the glass fiber at a speed of 1-2 mm/s; and finally, drying the pulled glass fiber at the temperature of 40-45 ℃ for 36-72 hours to obtain the coupling agent treated glass fiber.
5. The low temperature resistant asphalt concrete according to claim 2 or 3, wherein the asphalt is a matrix asphalt or an epoxy asphalt.
6. The low temperature resistant asphalt concrete according to claim 5, wherein the preparation process of the epoxy asphalt is as follows: heating the base asphalt to 160-175 ℃, adding the SBS segmented copolymer into the base asphalt, and shearing for 1-3 hours at 2000-3000 r/min to obtain SBS segmented copolymer modified asphalt; adding epoxy resin, a compatilizer and a curing agent into SBS block copolymer modified asphalt, and stirring for 30-60 minutes at the temperature of 130-140 ℃ at 500-1000 rpm to obtain the epoxy asphalt.
7. The low temperature resistant asphalt concrete according to claim 5, wherein the epoxy asphalt has a composition of: 100-200 parts of matrix asphalt, 9-20 parts of SBS block copolymer, 40-70 parts of epoxy resin, 15-30 parts of compatilizer and 32-50 parts of curing agent.
8. The low temperature resistant asphalt concrete according to claim 6 or 7, wherein the epoxy resin is a polyurethane epoxy resin.
9. The method for preparing low temperature resistant asphalt concrete according to claim 2 or 3, characterized by comprising the steps of:
the method comprises the following steps: respectively preserving the heat of the asphalt and the diatomite at the temperature of 130-140 ℃ for 4-6 hours; adding the heat-insulated diatomite into the heat-insulated asphalt, simultaneously shearing for 10-20 minutes at a high speed by using a high-speed shearing stirrer, and keeping the temperature of the asphalt at 130-140 ℃ all the time in the shearing process so as to uniformly disperse the diatomite in the asphalt mucilage to obtain diatomite modified asphalt, and keeping the temperature at 160-165 ℃ for later use;
step two: respectively preserving the temperature of the coarse aggregate and the fine aggregate at 160-165 ℃ for 2-4 hours; mixing the heat-insulated coarse aggregate and fine aggregate for 25-35 seconds, adding the diatomite modified asphalt obtained in the step one, and mixing for 30-40 seconds to obtain a diatomite modified asphalt mixture;
step three: carrying out heat preservation on glass fibers or glass fibers treated by a coupling agent for 4 hours at 160-165 ℃; adding the glass fiber subjected to heat preservation or the glass fiber treated by the coupling agent into the diatomite modified asphalt mixture obtained in the step two, and stirring for 60-90 seconds; adding mineral powder, and stirring for 30-60 seconds to obtain the low-temperature resistant asphalt concrete.
10. The method for preparing low temperature resistant asphalt concrete according to claim 9, wherein the shear rotation speed of the first step is 500-600 rpm.
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