CN116813243A - Polyurethane ultrathin wearing layer material and preparation method thereof - Google Patents
Polyurethane ultrathin wearing layer material and preparation method thereof Download PDFInfo
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- CN116813243A CN116813243A CN202310690814.1A CN202310690814A CN116813243A CN 116813243 A CN116813243 A CN 116813243A CN 202310690814 A CN202310690814 A CN 202310690814A CN 116813243 A CN116813243 A CN 116813243A
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- polyurethane
- wearing layer
- layer material
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 125
- 239000004814 polyurethane Substances 0.000 title claims abstract description 125
- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 70
- 239000011707 mineral Substances 0.000 claims abstract description 70
- 239000000853 adhesive Substances 0.000 claims abstract description 54
- 230000001070 adhesive effect Effects 0.000 claims abstract description 54
- 239000000843 powder Substances 0.000 claims abstract description 52
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims abstract description 21
- 239000003292 glue Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 81
- 238000002156 mixing Methods 0.000 claims description 45
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 24
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 23
- 239000000920 calcium hydroxide Substances 0.000 claims description 23
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 23
- 230000003712 anti-aging effect Effects 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 235000019738 Limestone Nutrition 0.000 claims description 18
- 239000006028 limestone Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 13
- 229920000728 polyester Polymers 0.000 claims description 13
- 239000004408 titanium dioxide Substances 0.000 claims description 12
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000010438 granite Substances 0.000 claims description 5
- 239000012948 isocyanate Substances 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- SKHBJDDIGYYYMJ-UHFFFAOYSA-N 2,6-ditert-butyl-6-methylcyclohexa-1,3-dien-1-ol Chemical compound CC(C)(C)C1=C(O)C(C)(C(C)(C)C)CC=C1 SKHBJDDIGYYYMJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229920005862 polyol Polymers 0.000 claims description 4
- 150000003077 polyols Chemical class 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- -1 3, 5-di-t-butyl-4-hydroxyphenyl Chemical group 0.000 claims description 2
- 229920002748 Basalt fiber Polymers 0.000 claims description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 50
- 230000005855 radiation Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010998 test method Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 9
- 239000011230 binding agent Substances 0.000 description 5
- 238000007580 dry-mixing Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010040844 Skin exfoliation Diseases 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction 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
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/16—Polyurethanes
-
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to the field of wearing layer materials for roads, in particular to a polyurethane ultrathin wearing layer material and a preparation method thereof. The polyurethane ultrathin wearing layer material comprises the following components: polyurethane adhesive, mineral aggregate, nanofiller and fiber; wherein the glue Dan Bi is 4% -7%, the mineral aggregate comprises coarse and fine aggregates and mineral powder, the mineral aggregate is light-colored mineral aggregate, and the nano filler has a high refractive index. The polyurethane ultrathin wearing layer material provided by the invention is beneficial to improving the road performance and service life of an ultrathin overlay and reducing the urban heat island effect.
Description
Technical Field
The invention relates to the field of wearing layer materials for roads, in particular to a polyurethane ultrathin wearing layer material and a preparation method thereof.
Background
The ultra-thin overlay technology of the asphalt pavement is a common technical means for preventing and curing the asphalt pavement. The ultra-thin overlay is additionally paved on the asphalt pavement with good structural performance but insufficient surface function, and is an important measure for recovering the skid resistance of the pavement and reducing the water seepage of the pavement. However, the thickness of the ultrathin cover is small, the thickness is only 1.5-2.5 cm, in addition, the ultrathin cover binder is made of multi-asphalt materials, and asphalt has strong temperature sensitivity and is easy to age. Under the multiple actions of high temperature, vehicle-mounted repeated load and the like, diseases such as peeling, loosening, pushing and the like are easy to occur, and the durability of the ultrathin cover surface is affected.
The ultra-thin mat coat of asphalt mixture absorbs solar heat radiation to produce pavement damage and urban heat island effects. The traditional ultrathin overlay is asphalt mixture, the pavement color is black, the absorptivity of solar heat radiation can reach 90% -95%, the solar heat radiation irradiates the black asphalt pavement for a long time, the pavement temperature is easy to rise, and the pavement temperature can be more than 65 ℃. At the moment, the asphalt in the ultrathin cover surface and the original asphalt pavement is changed from a viscoelastic state to a flowing state, and the defects of rutting, pushing and peeling easily occur under the repeated action of a heavy-duty vehicle. In addition, the direct radiation intensity of the sun in summer is up to 700-1000 w/m 2 After absorbing 90% -95% of heat radiation, the black ultrathin cover is emitted to the surrounding environment in the form of heat, and the urban dense building group is added, so that the average urban air temperature is 10 ℃ or more higher than suburban areas. The data show that the urban road coverage rate of China reaches 7-15%, and the urban road coverage rate of extra large cities is even more than 20%. Therefore, it is necessary to propose a new road surface to reduce the road surface high temperature damage and the urban heat island effect.
Disclosure of Invention
In order to solve the technical problems, the invention provides a polyurethane ultrathin wearing layer material and a preparation method thereof.
In a first aspect, the polyurethane ultrathin wearing layer material provided by the invention comprises the following components: polyurethane adhesive, mineral aggregate, mineral powder, nano filler and fiber; wherein the glue Dan Bi is 4% -7%, the mineral aggregate comprises coarse and fine aggregates and mineral powder, the mineral aggregate is light-colored mineral aggregate, and the nano filler has a high refractive index.
The light-colored ultrathin finish-face polyurethane mixture provided by the invention adopts polyurethane adhesive as the ultrathin finish-face mixture binder, has mechanical properties far higher than those of asphalt materials, and can obviously improve the road performance and durability of the ultrathin finish-face mixture. In particular, light-colored stones (granite, limestone and the like) are adopted in the preparation process of the mixture, titanium dioxide is added into the polyurethane adhesive, so that the heat radiation reflectivity of the road surface of the polyurethane mixture is obviously improved, the temperature of an ultrathin cover surface and an original road surface (the ultrathin cover surface is covered) is reduced, and diseases such as rutting and the like caused by high temperature are relieved (the road surface structure is shown as figure 1). The light-colored polyurethane mixture ultrathin overlay has high heat radiation reflectivity, reduces solar heat radiation energy absorbed by the light-colored polyurethane mixture ultrathin overlay, reduces heat transmission to the surrounding environment, and effectively reduces the heat island effect caused by the pavement. Therefore, the invention is beneficial to improving the road performance and service life of the ultrathin overlay and reducing the urban heat island effect.
Further preferably, the polyurethane adhesive is prepared from raw materials of polyol and isocyanate; the NCO content of the polyurethane adhesive is 6-15%, preferably 8-13%.
In the invention, the polyurethane material has excellent mechanical properties and is a light-colored and colorless adhesive material. The chemical reaction equation of Isocyanate and polyol to form polyurethane is shown in figure 2, the chemical components, molecular structure and macroscopic performance of the polyurethane cementing material have extremely large regulation threshold, the adjustable range of performance is wide, the adaptability is strong, the polyurethane cementing material is a designable high-molecular elastomer material between plastic and rubber, the polyurethane adopted by the invention is mixed with Isocyanate (Isocyanate) according to a certain proportion through specific polyol, the polyurethane is cured at normal temperature to form firm adhesion to aggregate in the invention, the polyurethane has better mechanical strength, wear resistance and elasticity, the polyurethane has better technical characteristics of becoming high-performance pavement cementing material than other cementing materials, the polyurethane raw material is mostly colorless or light-colored material, and the color of the polyurethane material can be regulated according to the use requirement.
Preferably, the nanofiller comprises a titanium dioxide nanofiller or a silicon dioxide nanofiller, preferably a titanium dioxide nanofiller.
Preferably, the nanofiller has a refractive index of 2.50 to 2.85.
Further preferably, the nano filler accounts for 3-5% of the mass of the polyurethane adhesive.
Preferably, the coarse and fine aggregates comprise one or more of light colored limestone, light colored granite and light colored ceramic particles, preferably light colored limestone. In the present invention, the light color includes gray, off-white and white.
Preferably, the glue Dan Bi is 4.5% to 6%, preferably 5% to 6%.
Preferably, the coarse and fine aggregates account for 93 to 95 parts and the mineral powder accounts for 5 to 7 parts based on 100 parts of the total mass of the mineral aggregate.
Further preferably, the mineral aggregate grading range of the polyurethane ultra-thin wearing layer material is as follows:
preferably, calcium hydroxide powder is adopted to replace 3 to 7 percent of mineral powder; the particle size of the calcium hydroxide powder is not more than 30 mu m.
Preferably, the fibers comprise one or more of polyester fibers, polyacrylonitrile fibers and basalt fibers, and are preferably polyester fibers.
Further preferably, an anti-aging agent is also included, which is 2, 6-di-t-butyl-cresol or pentaerythritol tetrakis [ beta- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ].
Further preferably, the anti-aging agent is 2, 6-di-t-butyl cresol; preferably, the 2, 6-di-tert-butyl cresol accounts for 0.1-0.2% of the mass of the polyurethane adhesive.
The invention adopts light-colored or colorless polyurethane adhesive as the mixture cementing material, and replaces the black asphalt binder of the ultrathin overlay of the traditional asphalt mixture; the mineral aggregate adopts light-colored mineral aggregate limestone, granite, light-colored ceramic particles and the like, and the high refractive index nano filler of titanium dioxide and silicon dioxide is added into the polyurethane adhesive, so that the heat radiation reflectivity of the ultra-thin finish surface of the polyurethane mixture is improved, and meanwhile, the synergistic effect of the polyurethane adhesive, the light-colored mineral aggregate and the high refractive index nano filler is adopted, so that the heat radiation reflectivity of the ultra-thin finish surface is obviously improved, the road performance and the service life of the ultra-thin finish surface are improved, and the urban heat island effect is reduced. In addition, the optimized polyurethane ultrathin wearing layer material formula system of the invention can greatly improve the comprehensive performance, the service life and the like of the polyurethane ultrathin wearing layer material.
In a second aspect, the invention provides a preparation method of the polyurethane ultrathin wearing layer material, which comprises the following steps:
1) Drying the aggregate at high temperature and cooling;
2) Mixing and stirring the nano filler, the anti-aging agent and the polyurethane adhesive to obtain a cementing material;
3) Preparing aggregates and mineral powder of each grade, and replacing part of the mineral powder with calcium hydroxide powder;
4) Placing the aggregates and fibers of each grade into a mixture stirring device for mixing, adding cementing materials and stirring, and then adding mineral powder and calcium hydroxide powder for stirring;
5) And forming polyurethane mixture at normal temperature.
Further preferably, the preparation method of the polyurethane ultrathin wearing layer material provided by the invention comprises the following steps:
1) Drying coarse and fine aggregates in a 105 ℃ oven for 4 hours, taking out the aggregates, cooling to room temperature for standby, and protecting against water sprinkling on the surface of the aggregates;
2) Adding the nano-filler and the anti-aging agent which are accurately weighed into the polyurethane adhesive, and stirring by adopting a high-speed dispersing machine to uniformly disperse the nano-filler and the anti-aging agent into the polyurethane adhesive, wherein the using equipment (the part contacting the polyurethane adhesive) is kept dry in the process;
3) The proportion of coarse and fine aggregates and mineral powder (calcium hydroxide powder replaces part of mineral powder) of each grade is adjusted by taking the median value in the grading range as a target;
4) Pouring coarse and fine aggregates and fibers of each grade into a mixing tank for 30s, adding a polyurethane adhesive which is accurately weighed and prepared into the mixing tank, mixing for 90s, adding accurately weighed mineral powder and calcium hydroxide, and mixing for 90s;
5) And forming polyurethane mixture at normal temperature.
The invention has the advantages that: firstly, adopting light-colored or colorless polyurethane adhesive as a mixture cementing material to replace black asphalt binder of the ultrathin cover surface of the traditional asphalt mixture; secondly, the mineral aggregate adopts light-colored mineral aggregate, mainly comprising limestone, granite, light-colored ceramic particles and the like; thirdly, high-refractive-index nano fillers such as titanium dioxide and silicon dioxide are added into the polyurethane adhesive, so that the heat radiation reflectivity of the ultra-thin cover surface of the polyurethane mixture is improved. By adopting the synergistic effect of the polyurethane adhesive, the light-colored mineral aggregate and the high-refractive index nano filler, the heat radiation reflectivity of the ultrathin overlay is obviously improved, the road performance and service life of the ultrathin overlay are improved, and the urban heat island effect is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the technical solutions of the prior art, the following description will briefly explain the embodiments or the drawings needed in the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a pavement structure of a polyurethane ultra-thin wearing layer provided by the invention;
fig. 2 is a schematic diagram of a chemical reaction equation of polyurethane provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. 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.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods. The examples are not intended to identify the particular technology or conditions, and are either conventional or are carried out according to the technology or conditions described in the literature in this field or are carried out according to the product specifications. The reagents and instruments used, etc. are not identified to the manufacturer and are conventional products available for purchase by regular vendors.
In the embodiment of the invention, the polyurethane adhesive is from Wanhua chemical group Co., ltd, and has NCO content of 8-13% and brand number 6750.
In the embodiment of the invention, the particle size of the calcium hydroxide powder is 0.01-30 mu m, the purity is 95-98%, and the calcium hydroxide powder is purchased from national pharmaceutical group chemical reagent Co.
In the embodiment of the invention, the nano filler with high refractive index is titanium dioxide, and the refractive index is 2.50-2.85, and the nano filler is purchased from national medicine group chemical reagent Co.
In the embodiment of the invention, the coarse and fine aggregates are light-colored mineral aggregate, in particular to gray (light-colored) limestone. The mineral powder is off-white limestone mineral powder.
In the embodiment of the invention, the preparation process of the polyurethane ultrathin wearing layer material comprises the following steps:
1) Drying coarse and fine aggregates in a 105 ℃ oven for 4 hours, taking out the aggregates, cooling to room temperature for standby, and protecting the aggregates from water sprinkling on the surfaces of the aggregates;
2) Adding the nano-filler and the anti-aging agent which are accurately weighed into the polyurethane adhesive, and stirring by adopting a high-speed dispersing machine to uniformly disperse the nano-filler and the anti-aging agent into the polyurethane adhesive, wherein the using equipment (the part contacting the polyurethane adhesive) is kept dry in the process;
3) The ratio of coarse and fine aggregates and mineral powder (calcium hydroxide powder replaces part of mineral powder) of each grade is adjusted by taking the median value in the grading range of table 1 as a target; the synthetic gradations used for the gradations are shown in table 1:
table 1 superthin overlay polyurethane mix mineral aggregate size range
4) Pouring coarse and fine aggregates and fibers of each grade into a mixing tank for 30s, adding a polyurethane adhesive which is accurately weighed and prepared into the mixing tank, mixing for 90s, adding accurately weighed mineral powder and calcium hydroxide, and mixing for 90s;
5) And forming polyurethane mixture at normal temperature.
The invention will be further illustrated with reference to examples.
Example 1
Firstly, coarse and fine aggregates (light limestone) subjected to drying treatment of each grade are mixed according to the synthetic gradation of the table 1 and added into a mixing pot, then a polyurethane adhesive (0.2% of anti-aging agent BHT is added) is accurately weighed according to 4% of glue Dan Bi and added into the mixing pot to be mixed for 90 seconds, then mineral powder (calcium hydroxide is used for replacing 5% of mineral powder) is added into the mixing pot to be mixed for 90 seconds, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rut board test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 2
Firstly, coarse and fine aggregates (light limestone) subjected to drying treatment of each grade are mixed according to the synthetic gradation of the table 1 and added into a mixing pot, then a polyurethane adhesive (0.2% of anti-aging agent BHT is added) is accurately weighed according to 5% of glue Dan Bi and added into the mixing pot for mixing for 90 seconds, then mineral powder (calcium hydroxide is used for replacing 5% of mineral powder) is added into the mixing pot for mixing for 90 seconds, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rut board test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 3
Firstly, coarse and fine aggregates (light limestone) subjected to drying treatment of each grade are mixed according to the synthetic gradation of the table 1 and added into a mixing pot, then a polyurethane adhesive (0.2% of anti-aging agent BHT is added) is accurately weighed according to 6% of glue Dan Bi and added into the mixing pot to be mixed for 90 seconds, then mineral powder (calcium hydroxide is used for replacing 5% of mineral powder) is added into the mixing pot to be mixed for 90 seconds, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rut board test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 4
Firstly, coarse and fine aggregates (light limestone) subjected to drying treatment of each grade are mixed according to the synthetic gradation of the table 1, 0.2% of polyester fiber (mineral aggregate mass) is accurately weighed, the coarse and fine aggregates and the polyester fiber are added into a mixing pot for dry mixing for 30s, then a polyurethane adhesive (0.2% of anti-aging agent BHT is added) is accurately weighed according to 5% of adhesive Dan Bi and added into the mixing pot for mixing for 90s, then mineral powder (calcium hydroxide is used for replacing 5% of mineral powder) is added into the mixing pot and mixed for 90s again, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rutting plate test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 5
Firstly, coarse and fine aggregates (light-colored limestone) subjected to drying treatment of each grade are mixed according to the synthetic grading of the table 1, 0.2% polyester fiber (mineral aggregate mass) is accurately weighed, and the coarse and fine aggregates and the polyester fiber are added into a mixing pot for dry mixing for 30s. Meanwhile, 1% of titanium dioxide nanofiller and 0.2% of anti-aging agent BHT (polyurethane adhesive mass) are added into the polyurethane adhesive, and a high-speed dispersing machine is adopted to uniformly disperse the nanofiller and the anti-aging agent into the polyurethane adhesive. The polyurethane adhesive is precisely weighed according to 5% of adhesive Dan Bi and added into a mixing pot to be mixed for 90s, then mineral powder (calcium hydroxide replaces 5% of mineral powder) is added into the mixing pot to be mixed for 90s, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rutting plate test piece are molded at normal temperature according to the manufacturing method of the asphalt mixture test piece in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 6
Firstly, coarse and fine aggregates (light-colored limestone) subjected to drying treatment of each grade are mixed according to the synthetic grading of the table 1, 0.2% polyester fiber (mineral aggregate mass) is accurately weighed, and the coarse and fine aggregates and the polyester fiber are added into a mixing pot for dry mixing for 30s. Meanwhile, 3% of titanium dioxide nanofiller and 0.2% of anti-aging agent BHT (polyurethane adhesive mass) are added into the polyurethane adhesive, and a high-speed dispersing machine is adopted to uniformly disperse the nanofiller and the anti-aging agent into the polyurethane adhesive. The polyurethane adhesive is precisely weighed according to 5% of adhesive Dan Bi and added into a mixing pot to be mixed for 90s, then mineral powder (calcium hydroxide replaces 5% of mineral powder) is added into the mixing pot to be mixed for 90s, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rutting plate test piece are molded at normal temperature according to the manufacturing method of the asphalt mixture test piece in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Example 7
Firstly, coarse and fine aggregates (light-colored limestone) subjected to drying treatment of each grade are mixed according to the synthetic grading of the table 1, 0.2% polyester fiber (mineral aggregate mass) is accurately weighed, and the coarse and fine aggregates and the polyester fiber are added into a mixing pot for dry mixing for 30s. Meanwhile, 5% of titanium dioxide nanofiller and 0.2% of anti-aging agent BHT (polyurethane adhesive mass) are added into the polyurethane adhesive, and a high-speed dispersing machine is adopted to uniformly disperse the nanofiller and the anti-aging agent into the polyurethane adhesive. The polyurethane adhesive is precisely weighed according to 5% of adhesive Dan Bi and added into a mixing pot to be mixed for 90s, then mineral powder (calcium hydroxide replaces 5% of mineral powder) is added into the mixing pot to be mixed for 90s, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rutting plate test piece are molded at normal temperature according to the manufacturing method of the asphalt mixture test piece in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Comparative example 1
Firstly, coarse and fine aggregates (black basalt) subjected to drying treatment of each grade are mixed according to the synthetic gradation of the table 1 and added into a mixing pot, then a polyurethane adhesive (0.2% of anti-aging agent BHT is added) is accurately weighed according to 5% of glue Dan Bi and added into the mixing pot for mixing for 90 seconds, then mineral powder (calcium hydroxide is used for replacing 5% of mineral powder) is added into the mixing pot for mixing for 90 seconds, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rut board test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). And (3) placing the molded test piece at normal temperature for curing for 3 days, and then placing the molded test piece in a 60 ℃ oven for curing for 4 days, so that the test piece subjected to curing is subjected to test.
Comparative example 2
And forming an asphalt mixture Marshall test piece and a rutting test piece according to a traditional ultra-thin finish surface mixture forming mode. Firstly, coarse and fine aggregates (light-colored limestone) subjected to drying treatment of each grade are mixed according to the synthetic grading of the table 1, 0.2% polyester fiber (mineral aggregate mass) is accurately weighed, and the coarse and fine aggregates and the polyester fiber are added into a mixing pot for dry mixing for 30s. Then SBS modified asphalt is added into a mixing pot according to the oil-stone ratio of 5.5% and mixed for 90s, mineral powder (calcium hydroxide replaces 5% mineral powder) is added into the mixing pot and mixed for 90s again, and then a polyurethane mixture Marshall test piece and a polyurethane mixture rutting plate test piece are molded at normal temperature according to the asphalt mixture test piece manufacturing method in Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011).
The mixture was tested for Marshall stability, split strength, and low temperature flexural failure strain according to Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011), and the test results are shown in Table 2.
TABLE 2 Properties of mixtures under different conditions
As shown in table 2, by comparing example 1, example 2 and example 3 with comparative example 2, it is obtained that: compared with SBS modified asphalt, the polyurethane adhesive has obviously improved properties (Marshall stability, splitting strength and bending damage strain) when being used as a mixture binder. In addition, as the mixing amount (the gum-stone ratio) of the polyurethane adhesive is increased, the performance of the polyurethane mixture is further improved, but after the gum Dan Bi is more than 5%, the improvement range of the performance of the mixture is smaller as the gum-stone ratio is increased.
From comparative example 2 and example 4: by adding the fiber, the low-temperature bending damage strain of the polyurethane mixture is greatly improved, and the cracking resistance of the polyurethane mixture is further improved.
By comparing example 2, example 5, example 6, example 7, it follows: the effect on the performance of the polyurethane mixture is small by adding the titanium dioxide nano filler.
By comparing example 2 with comparative example 1, it is obtained that: the Marshall stability and the splitting strength of the polyurethane mixture are slightly improved by adopting black basalt aggregate to replace light limestone aggregate, and the bending damage strain is slightly reduced but the variation range is limited.
Under the direct irradiation of high-temperature weather sun, a temperature sensor is adopted to observe the highest temperatures (between 2cm and 3 cm) on the surface and in the interior of the rutting plate test piece of different mixtures. The test results are shown in Table 3.
TABLE 3 maximum surface and internal temperatures for different mixtures
From table 3, by comparing example 1, example 2, example 3, example 4 with comparative example 1 and comparative example 2, it is found that: the polyurethane cementing material is adopted to replace asphalt materials, and the light-colored aggregate (limestone) is selected to replace black aggregate (basalt), so that the heat radiation reflectivity of the mixture is improved, and the temperature of the mixture is reduced.
By comparing example 2, example 5, example 6, example 7, it follows: the nano filler (titanium dioxide) with high refractive index is added into the polyurethane cementing material, so that the heat radiation reflectivity of the mixture is improved, and the temperature of the mixture is reduced.
According to the preparation methods of each example 7 and comparative example 2, the polyurethane mixture ultra-thin wearing layer is paved at normal temperature and the asphalt mixture ultra-thin wearing layer is Wen Puzhu by comparing the preparation methods in the field paving test section. The paving thickness of the ultra-thin wearing layer test section of the polyurethane mixture and the asphalt mixture is 2.0mm. The monitoring results of the highest temperatures of the surface and the bottom of the ultrathin wearing layer show that the highest temperature of the surface of the ultrathin wearing layer in the example 7 is reduced by about 10 ℃ compared with that in the comparative example 2, and the monitoring results of the temperatures of the field paving test sections in the example 7 and the comparative example 2 are consistent with the trend of the test results in the table 2, so that the invention can effectively improve the heat radiation reflectivity of the mixture and reduce the pavement temperature. Meanwhile, the polyurethane ultrathin wearing layer paved on site in the embodiment 7 of the invention has excellent performance, and road surface diseases do not appear in open traffic of a test road section for one year so far, so that the better performance is maintained.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A polyurethane ultra-thin wearing layer material, which is characterized by comprising the following components: polyurethane adhesive, mineral aggregate, nanofiller and fiber; wherein the glue Dan Bi is 4% -7%, the mineral aggregate comprises coarse and fine aggregates and mineral powder, the mineral aggregate is light-colored mineral aggregate, and the nano filler has a high refractive index.
2. The polyurethane ultra-thin wearing layer material according to claim 1, wherein the polyurethane adhesive is prepared from raw materials of polyol and isocyanate; the NCO content of the polyurethane adhesive is 6% -15%.
3. The polyurethane ultra-thin wearing layer material according to claim 1 or 2, wherein the nanofiller comprises a titanium dioxide nanofiller or a silicon dioxide nanofiller; the refractive index of the nano filler is 2.50-2.85; preferably, the nano filler accounts for 3-5% of the mass of the polyurethane adhesive.
4. A polyurethane ultra-thin wearing layer material according to any one of claims 1-3, wherein the coarse and fine aggregate comprises one or more of light-colored limestone, light-colored granite and light-colored ceramic particles.
5. The polyurethane ultra-thin wearing layer material according to claim 4, wherein the glue Dan Bi is 4.5-6%, preferably 5-6%; according to the total mass of the mineral aggregate being 100 parts, the coarse and fine aggregates account for 93 to 95 parts, and the mineral powder accounts for 5 to 7 parts;
preferably, the mineral aggregate grading range of the polyurethane ultrathin wearing layer material is as follows:
mesh mm 13.2 9.5 6.3 4.75 2.36 1.18 0.6 0.3 0.15 0.075 grade upper limit% 100 100 45 35 30 22 16 12 10 7 grade median% 100 90 37.5 27.5 24 16 11 8.5 7 5.5 grade lower limit% 100 80 30 20 18 10 65 4 4.
6. The polyurethane ultrathin wearing layer material according to any one of claims 1-5, wherein calcium hydroxide powder is used for replacing 3% -7% of mineral powder; the particle size of the calcium hydroxide powder is not more than 30 mu m.
7. The polyurethane ultra-thin wearing layer material of any one of claims 1-6, wherein the fibers comprise one or more of polyester fibers, polyacrylonitrile fibers, basalt fibers; preferably, the fibers are 0.1 to 0.3 percent of the mass of the mineral aggregate.
8. The polyurethane ultra-thin wearing layer material according to any one of claims 1 to 7, further comprising an anti-aging agent which is 2, 6-di-t-butyl cresol or pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ].
9. The polyurethane ultra-thin wearing layer material according to claim 8, wherein the anti-aging agent is 2, 6-di-t-butyl cresol; preferably, the 2, 6-di-tert-butyl cresol accounts for 0.1-0.2% of the mass of the polyurethane adhesive.
10. A method for preparing the polyurethane ultrathin wearing layer material as claimed in any one of claims 1 to 9, which is characterized by comprising the following steps:
1) Drying the aggregate at high temperature and cooling;
2) Mixing and stirring the nano filler, the anti-aging agent and the polyurethane adhesive to obtain a cementing material;
3) Preparing aggregates and mineral powder of each grade, and replacing part of the mineral powder with calcium hydroxide powder;
4) Placing the aggregates and fibers of each grade into a mixture stirring device for mixing, adding cementing materials and stirring, and then adding mineral powder and calcium hydroxide powder for stirring;
5) And forming polyurethane mixture at normal temperature.
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