CN115108759A - Cold-mixing close-graded carbon dioxide copolymer mixture and preparation and paving methods thereof - Google Patents
Cold-mixing close-graded carbon dioxide copolymer mixture and preparation and paving methods thereof Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 125
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Natural products O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 84
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 84
- 229920001577 copolymer Polymers 0.000 title claims abstract description 73
- 238000002156 mixing Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 229920000728 polyester Polymers 0.000 claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- -1 polypropylene carbonate Polymers 0.000 claims description 13
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229920000379 polypropylene carbonate Polymers 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000004567 concrete Substances 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 239000010779 crude oil Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 5
- 229920006167 biodegradable resin Polymers 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract description 2
- 238000007334 copolymerization reaction Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 150000002118 epoxides Chemical class 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 21
- 239000004593 Epoxy Substances 0.000 description 16
- 229910052799 carbon Inorganic materials 0.000 description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 239000002994 raw material Substances 0.000 description 10
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011384 asphalt concrete Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000012492 regenerant Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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- 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
- C04B26/18—Polyesters; Polycarbonates
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0675—Macromolecular compounds fibrous from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0683—Polyesters, e.g. polylactides
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/30—Coherent pavings made in situ made of road-metal and binders of road-metal and other binders, e.g. synthetic material, i.e. resin
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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
Abstract
The invention discloses a cold-mixing close-graded carbon dioxide copolymer mixture and a preparation and paving method thereof, wherein the mixture comprises 6-10 parts of carbon dioxide copolymer solution, 47-73 parts of coarse aggregate, 25-50 parts of fine aggregate, 2-3 parts of mineral powder and 0.3-0.5 part of polyester fiber. The biodegradable resin obtained by the copolymerization method is adjusted under the catalysis of carbon dioxide and epoxide, so that the environment is not polluted, the carbon dioxide resource is fully utilized, and the consumption of crude oil which is a non-renewable resource is greatly reduced; meanwhile, the preparation method of the cold-mixing close-graded carbon dioxide copolymer mixture provided by the invention is a cold-mixing process, further reduces the energy consumption of the mixture in the whole process of mixing, transporting, paving, curing and the like, reduces the emission of carbon dioxide, and has great significance for promoting the green development of the traffic field, solving the problem of resource shortage, reducing the production cost and improving the economic benefit.
Description
Technical Field
The invention belongs to the technical field of pavement engineering, and particularly relates to a cold-mix dense-graded carbon dioxide copolymer mixture and preparation and paving methods thereof.
Background
In recent years, the traffic field of China is rapidly developed, the domestic traffic volume is greatly increased, the road grade is generally improved, and the requirement on road construction is more strict. The asphalt pavement is widely applied to pavement of high-grade pavements and bridge decks with excellent high-temperature stability, water stability and fatigue resistance, so that the consumption of asphalt concrete is greatly increased, and the annual demand total of asphalt concrete in China in 2020 reaches about 4.2 hundred million tons. However, the vast majority of asphalt binders are petroleum asphalts extracted from crude oil, with limited and non-renewable resources, which face the crisis of imbalance between supply and demand; meanwhile, the heavy use of petroleum asphalt has serious influence on the ecological environment of the earth. Therefore, the search for sustainable green paving materials to replace petroleum asphalt has become an urgent need in the road field.
In addition, climate change is a major global challenge facing human beings today, and controlling and reducing the emission of greenhouse gases such as carbon dioxide are key to protecting the ecological environment of the earth. In 2021, 10 months, the development goal that the total carbon dioxide emission in domestic production in 2030 units is reduced by more than 65% compared with 2005 is clarified, and the 'double carbon' action of each industry is steady. The International Energy Agency (IEA) statistics shows that the carbon emission of transportation accounts for more than 26% of the global carbon emission, the carbon emission of road transportation accounts for about 20% of the global carbon emission, China is used as a large-traffic country, the carbon emission of transportation in 2021 years exceeds 10 hundred million tons, the characteristics of high weight and large quantity are shown on the whole, the low-carbon development of traffic infrastructure is very probable, and the method is also the inherent requirement and the inevitable trend for promoting the double-carbon strategy in China.
Chinese patent CN109704637A discloses a pavement regenerant and a preparation method and application thereof, wherein the pavement regenerant is prepared by using a carbon dioxide copolymer, a fiber material and a nano filler. However, the said patent has low strength and poor stability, and can only be used for repairing damaged pavement.
In conclusion, how to closely match the strategy of 'double carbon', and to develop a novel binder for pavement and bridge paving mixture with low carbon, environmental protection and excellent performance is a technical problem to be solved urgently.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of the prior art, provides a novel low-carbon, environment-friendly, wear-resistant and high-strength dense-graded carbon dioxide copolymer mixture which can replace an asphalt mixture in the traditional road pavement, and has the advantages of reducing the global crude oil resource burden, promoting the green development of the traffic field, solving the problem of resource shortage, reducing the production cost and improving the economic benefit.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a cold-mixing close-graded carbon dioxide copolymer mixture comprises the following components in percentage by mass:
carbon dioxide copolymer solution: 6-10 parts;
coarse aggregate: 47-73 parts;
fine aggregate: 25-50 parts;
mineral powder: 2-3 parts of a solvent;
polyester fiber: 0.3-0.5 part.
Specifically, the carbon dioxide copolymer solution is a solution obtained by dissolving one or two of polypropylene carbonate and polyethylene carbonate in ethyl acetate, and the mass concentration of the solution is 25 +/-5%.
Specifically, the coarse aggregate is selected from any one or a combination of two or more of basalt, limestone and steel slag.
Specifically, the fine aggregate is selected from any one or a combination of two or more of basalt sand, limestone sand and stone chips.
Specifically, the polyester fiber is polyethylene terephthalate fiber, the average length of the polyester fiber is 4-8mm, and the average diameter of the polyester fiber is 15-25 mu m. The polyethylene terephthalate fiber has strong adsorbability and is not wound, so that the viscosity and cohesive force of the carbon dioxide copolymer solution are increased, and meanwhile, the high-temperature stability of the mixture is effectively improved due to the criss-cross reinforcement and bridging effect.
Preferably, the aggregate composition of the coarse aggregate, the fine aggregate and the mineral powder is as follows:
furthermore, the cold-mixing dense-graded carbon dioxide copolymer mixture is used for paving road surfaces, concrete bridge surfaces or steel bridge surfaces.
Further, the invention also provides a preparation method of the cold-mix compact-graded carbon dioxide copolymer mixture, which comprises the following steps:
(1) preparing a carbon dioxide copolymer solution, wherein the mass concentration is controlled to be 25 +/-5%;
(2) respectively drying the coarse aggregate, the fine aggregate and the polyester fiber according to the grading design;
(3) and (3) putting the dried coarse aggregate, the dried fine aggregate and the polyester fiber into a mixer to be mixed at room temperature, mixing for 3-5 min, mixing with the carbon dioxide copolymer solution prepared in the step (1), continuously mixing for 25 +/-5 min, adding the mineral powder, and continuously mixing for 15 +/-5 min.
Specifically, the cold-mixing close-graded carbon dioxide copolymer mixture comprises the following steps when being used for paving road surfaces, concrete bridge decks and steel bridge decks:
(1) preparing a carbon dioxide copolymer solution, and controlling the mass concentration to be 25 +/-5%;
(2) respectively drying the coarse aggregate, the fine aggregate and the polyester fiber according to the grading design;
(3) putting the dried coarse aggregate, the dried fine aggregate and the polyester fiber into a mixing machine, mixing at room temperature, mixing for 3-5 min, mixing with the carbon dioxide copolymer solution prepared in the step (1), continuously mixing for 25 +/-5 min, adding the mineral powder, and continuously mixing for 15 +/-5 min to obtain a cold-mixing dense-graded carbon dioxide copolymer mixture;
(4) and (4) paving the cold-mixing dense-graded carbon dioxide copolymer mixture obtained in the step (3) on a road surface, performing roll forming, and maintaining for 36-96 hours at the temperature of 25 +/-10 ℃.
Preferably, the leaving temperature of the cold-mix compacted carbon dioxide copolymer mixture in the step (3) is controlled to be 25 +/-10 ℃.
Has the advantages that:
(1) according to the invention, the carbon dioxide copolymer solution is added, and the component proportion is optimized, so that the high mechanical strength, the high-temperature stability and the low-temperature crack resistance are realized, the carbon dioxide copolymer solution can be directly used for paving pavements and bridge decks, the application range is wider, and the economic benefit and the carbon reduction effect are better.
(2) The binder of the cold-mixing dense-graded carbon dioxide copolymer mixture is prepared from carbon dioxide copolymer polypropylene carbonate and polyethylene carbonate, is biodegradable resin obtained by adjusting a copolymerization method of carbon dioxide and epoxide under the catalysis, does not pollute the environment, fully utilizes carbon dioxide resources, greatly reduces the consumption of non-renewable resource crude oil, can relieve the greenhouse effect caused by carbon dioxide emission, and belongs to an environment-friendly road material;
(3) the construction process of the cold-mixed close-graded carbon dioxide copolymer mixture is cold-mixed construction, namely the whole process construction procedures of mixing, transportation, paving, maintenance and the like can be completed at normal temperature, the heating and heat preservation processes in the traditional hot-mixed and warm-mixed asphalt mixture construction process are omitted, the energy consumption is reduced, the emission of carbon dioxide is further reduced, and the cold-mixed close-graded carbon dioxide copolymer mixture has great significance for promoting the green development of the traffic field, solving the problem of resource shortage, reducing the production cost and improving the economic benefit.
(4) In the synthetic raw materials of the cold-mixing close-graded carbon dioxide copolymer mixture, the polypropylene carbonate and the polyethylene carbonate have good flexibility and good tensile, bending and impact resistance properties due to asymmetric molecular chain structures, so that the fracture elongation and the cold resistance of the mixture can be obviously increased, but the brittleness and the tensile strength of the mixture can be reduced; therefore, the high-temperature stability and the tensile strength of the mixture can be effectively improved by adding the polyester fiber with strong adsorbability and utilizing the criss-cross reinforcement and bridging action of the polyester fiber. The cold-mixing compact-graded carbon dioxide copolymer mixture has excellent high-temperature stability, low-temperature crack resistance, water stability, compression resistance and skid resistance, meets the standard requirements, and can be applied to pavement of pavements and bridge decks.
Drawings
FIG. 1 is a flow chart of a method of preparing a cold mix, dense graded carbon dioxide copolymer composition according to an embodiment of the invention.
FIG. 2 is a flow chart of a paving method of a cold mix dense graded carbon dioxide copolymer mixture according to an embodiment of the invention.
Detailed Description
The invention will be better understood from the following examples.
Example 1
The components comprise the following raw materials in parts by mass:
table 1 example 1 raw material condition table
The propylene carbonate and the polyethylene carbonate have good flexibility and tensile, bending and impact resistance due to asymmetric molecular chain structures, can obviously increase the fracture elongation and cold resistance of the mixture, but can reduce the brittleness and tensile strength of the mixture; therefore, the polyester fiber has strong adsorbability by adding the polyester fiber, and the high-temperature stability and the tensile strength of the mixture can be effectively improved due to the criss-cross reinforcement and bridging effect of the polyester fiber.
Referring to fig. 1 and 2, a cold-mix, close-graded carbon dioxide copolymer blend of example 1 was prepared as follows:
(1) dissolving polypropylene carbonate in an ethyl acetate solution to obtain a carbon dioxide copolymer solution with the concentration of 25 percent;
(2) placing coarse aggregates, fine aggregates and polyester fibers with various particle sizes into an oven according to the designed grading and mass components, and drying to 25 +/-5 ℃;
(3) and (3) putting the dried coarse aggregate, the dried fine aggregate and the polyester fiber into a mixer to mix at room temperature (25 +/-5 ℃), mixing for 3-5 min, mixing with the carbon dioxide copolymer solution prepared in the step (1), continuing to mix for 25 +/-5 min, adding the mineral powder, and continuing to mix for 15 +/-5 min to obtain the cold-mixing dense-graded carbon dioxide copolymer mixture in the embodiment 1.
Example 1 cold-mix, close-graded carbon dioxide copolymer blends the properties are given in table 2:
TABLE 2 EXAMPLE 1 pavement Properties of Cold-mix, dense-graded carbon dioxide copolymer blends
Example 2
The components are as follows by mass parts:
table 3 table of raw materials in example 2
The preparation method is the same as example 1.
Example 2 cold-mix, close-graded carbon dioxide copolymer blends properties are given in table 4:
TABLE 4 EXAMPLE 2 pavement Properties of Cold-mix, dense-graded carbon dioxide copolymer blends
Example 3
The components are as follows by mass parts:
table 5 table of raw materials in example 3
The preparation method is the same as example 1.
Example 3 Cold-mix compacted carbon dioxide copolymer blends properties are given in Table 6:
TABLE 6 example 3 pavement properties of cold-mix, dense-graded carbon dioxide copolymer blends
Example 4
The components are as follows by mass parts:
table 7 table of raw materials in example 4
The preparation method is the same as example 1.
Example 4 cold-mix, close-graded carbon dioxide copolymer blends properties are given in table 8:
TABLE 8 example 4 road Properties of cold-mix, dense-graded carbon dioxide copolymer blends
Comparative example 1
The components are as follows by mass parts:
TABLE 9 raw material conditions of comparative example 1
The preparation method is the same as example 1.
Comparative example 1 properties of polyester fiber-free carbon dioxide copolymer blends are shown in table 10:
TABLE 10 pavement performance of comparative example 1 polyester fiber-free carbon dioxide copolymer blends
Comparative example 2
The components are as follows by mass parts:
TABLE 11 raw material condition table of comparative example 2
The preparation method comprises the following steps:
(1) preheating the components to 160 +/-10 ℃;
(2) and (3) putting the coarse aggregate and the fine aggregate into a mixer to be mixed for 90s, adding asphalt to be mixed for 15 +/-5 min, adding mineral powder to be mixed for 20 +/-5 min, and obtaining the asphalt mixture of the comparative example 2.
Comparative example 2 asphalt mix properties are as in table 12:
TABLE 12 road performance of asphalt mixture of comparative example 2
Comparative example 3
The components comprise the following raw materials in parts by mass:
TABLE 13 raw material condition table of comparative example 3
The preparation method comprises the following steps:
(1) preparing epoxy asphalt: consists of epoxy resin, curing agent and matrix asphalt; adding a curing agent into the matrix asphalt, stirring for 5min at 75-85 ℃ to form a blend, adding epoxy resin, continuously stirring for 5min to obtain epoxy asphalt, and heating the epoxy asphalt to 160-180 ℃;
(2) mixing the coarse aggregate and the fine aggregate according to a proportion, heating to 190 ℃ at 180 ℃, then mixing with the epoxy asphalt, adding the mineral powder after mixing for 20-30 minutes, and continuing mixing for 10-20 minutes to obtain an epoxy asphalt mixture of a comparative example 3;
comparative example 3 properties of the epoxy asphalt mixture are shown in table 14:
TABLE 14 pavement performance of comparative example 3 epoxy asphalt mixture
Examples 1-4 above all pertain to a cold mix, close-graded carbon dioxide copolymer blend of the present invention; comparative example 1 is a carbon dioxide copolymer blend without added polyester fibers; comparative example 2 is a common matrix asphalt mixture; comparative example 3 is an epoxy asphalt mix. For the purpose of subsequent analysis, examples 1-4 are referred to as inventive mixes 1-4, comparative example 1 is referred to as a polyester fiber-free carbon dioxide copolymer mix, comparative example 2 is referred to as a matrix asphalt mix, and comparative example 3 is referred to as an epoxy asphalt mix, respectively. The results of the road performance tests are summarized in Table 15 below:
TABLE 15 summary of the results of the road performance tests for the examples and comparative examples
From the analysis of the data in the above table, the following conclusions can be drawn:
(1) the average values of the dynamic stability and the tensile strain of the mixture 1-4 of the invention are 23312.5 times/min and 17.57 multiplied by 10 respectively -3 Is far more than 12590 times/min and 8.26 multiplied by 10 times of polyester fiber-free carbon dioxide copolymer mixture -3 The polyester fiber is added into the carbon dioxide copolymer mixture component to effectively improve the high-temperature stability and the tensile strength of the carbon dioxide copolymer mixture component.
(2) The average value of the 1-4 dynamic stability of the mixture is 23312.5 times/min, which is far larger than 5500 times/min of the asphalt mixture and is obviously lower than 48760 times/min of the epoxy asphalt mixture, but the average value meets the specification requirements: not less than 800 times/min. Exhibits excellent high-temperature stability;
(3) the stiffness modulus of the mixture 1-4 of the invention is far less than that of the asphalt mixture and the epoxy asphalt mixture, the mixture shows better flexibility and is not easy to generate the phenomenon of fragmentation due to over brittleness of the material under the low temperature condition; meanwhile, the tensile strain of the asphalt is far greater than that of the asphalt mixture and the epoxy asphalt mixture, and the minimum value is 16.61 multiplied by 10 -3 Further shows strong low-temperature crack resistance, and simultaneously far meets the specification requirements: tensile strain of not less than 2.5X 10 -3 ；
(4) The average value of the residual stability of the mixtures 1 to 4 of the invention is 83.15%, slightly higher than 81.3% of the asphalt mixture and lower than 90.75% of the epoxy asphalt mixture, and all meet the specification requirements: not less than 80%. The excellent water damage resistance of the mixture is shown;
(5) the compression strength and the compression resilience modulus of the mixture 1-4 are higher than those of the asphalt mixture and are close to those of the epoxy asphalt mixture, and the load-bearing capacity of the epoxy asphalt mixture is far higher than that of other types of mixtures and the price is high, so that the mixture has good load-bearing capacity;
(6) when the mixture 1-4 is in a dry state, the pendulum friction coefficient is distributed in a range of 76-85; when in a wet state, the pendulum friction coefficient is distributed in an interval of 64-68; both are larger than the asphalt mixture and the epoxy asphalt mixture, and show good anti-skid performance.
From the above conclusions, the cold-mixing dense-graded carbon dioxide copolymer mixture has excellent road performance, meets the standard requirements, fully utilizes carbon dioxide resources, greatly reduces the consumption of crude oil which is a non-renewable resource, can relieve the greenhouse effect caused by carbon dioxide emission, can provide powerful technical support for realizing the purposes of carbon peak reaching and carbon neutralization, and has great significance for reasonably utilizing waste steel slag, promoting the green development of the traffic field, solving the problem of resource shortage, reducing the production cost and improving the economic benefit.
The invention provides a cold-mixing close-graded carbon dioxide copolymer mixture and a preparation method and a paving method thereof, and a plurality of methods and ways for realizing the technical scheme are provided. All the components not specified in the present embodiment can be realized by the prior art.
Claims (10)
1. The cold-mixing close-graded carbon dioxide copolymer mixture is characterized by comprising the following components in percentage by mass:
carbon dioxide copolymer solution: 6-10 parts;
coarse aggregate: 47-73 parts;
fine aggregate: 25-50 parts;
mineral powder: 2-3 parts of a solvent;
polyester fiber: 0.3-0.5 part.
2. The cold-mix dense-graded carbon dioxide copolymer mixture according to claim 1, wherein the mass concentration of the carbon dioxide copolymer solution is 25 ± 5% of a solution obtained by dissolving one or two of polypropylene carbonate and polyethylene carbonate in ethyl acetate.
3. The cold-mix dense-graded carbon dioxide copolymer mixture according to claim 1, wherein the coarse aggregate is selected from any one or a combination of two or more of basalt, limestone and steel slag.
4. The cold mix dense-graded carbon dioxide copolymer blend according to claim 1, wherein the fine aggregate is selected from any one or a combination of two or more of basalt sand, limestone sand and stone dust.
5. The cold-mix compacted carbon dioxide copolymer composition according to claim 1, wherein the polyester fibers are polyethylene terephthalate fibers having an average length of 4 to 8mm and an average diameter of 15 to 25 μm.
6. The cold-mix dense-graded carbon dioxide copolymer mixture according to claim 1, wherein the aggregate grading of the coarse aggregate, the fine aggregate and the mineral powder is as follows:
7. the cold mix, compacted graded carbon dioxide copolymer mixture according to claim 1, wherein the cold mix compacted graded carbon dioxide copolymer mixture is used for paving road pavements, concrete bridge pavements or steel bridge pavements.
8. The method of preparing a cold-mix, close-graded carbon dioxide copolymer composition of claim 1, comprising the steps of:
(1) preparing a carbon dioxide copolymer solution, and controlling the mass concentration to be 25 +/-5%;
(2) respectively drying the coarse aggregate, the fine aggregate and the polyester fiber according to the grading design;
(3) and (3) putting the dried coarse aggregate, the dried fine aggregate and the polyester fiber into a mixer to be mixed at room temperature, mixing for 3-5 min, mixing with the carbon dioxide copolymer solution prepared in the step (1), continuously mixing for 25 +/-5 min, adding the mineral powder, and continuously mixing for 15 +/-5 min.
9. The paving method of the cold-mix dense-graded carbon dioxide copolymer mixture according to claim 1, which comprises the following steps:
(1) preparing a carbon dioxide copolymer solution, and controlling the mass concentration to be 25 +/-5%;
(2) respectively drying the coarse aggregate, the fine aggregate and the polyester fiber according to the grading design;
(3) putting the dried coarse aggregate, the dried fine aggregate and the polyester fiber into a mixing machine, mixing at room temperature, mixing for 3-5 min, mixing with the carbon dioxide copolymer solution prepared in the step (1), continuously mixing for 25 +/-5 min, adding the mineral powder, and continuously mixing for 15 +/-5 min to obtain a cold-mixing dense-graded carbon dioxide copolymer mixture;
(4) and (4) paving the cold-mixing dense-graded carbon dioxide copolymer mixture obtained in the step (3) on a road surface, performing roll forming, and maintaining for 36-96 hours at the temperature of 25 +/-10 ℃.
10. The paving method according to claim 9, wherein the leaving temperature of the cold-mix compacted carbon dioxide copolymer mixture in the step (3) is controlled to be 25 ± 10 ℃.
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| JP2003027409A (en) * | 2001-07-17 | 2003-01-29 | Nippon Nsc Ltd | Binder, paving method using the same, and pavement material produced by using the same |
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| JP2003027409A (en) * | 2001-07-17 | 2003-01-29 | Nippon Nsc Ltd | Binder, paving method using the same, and pavement material produced by using the same |
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