CN111499245B - Preparation method of composite shaping phase thinned aggregate for asphalt mixture - Google Patents
Preparation method of composite shaping phase thinned aggregate for asphalt mixture Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 66
- 239000010426 asphalt Substances 0.000 title claims abstract description 53
- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 238000007493 shaping process Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000008859 change Effects 0.000 claims abstract description 52
- 239000004568 cement Substances 0.000 claims abstract description 40
- 239000004567 concrete Substances 0.000 claims abstract description 40
- 239000002699 waste material Substances 0.000 claims abstract description 40
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 38
- 238000004140 cleaning Methods 0.000 claims abstract description 38
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000005303 weighing Methods 0.000 claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 claims description 11
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- 229910052582 BN Inorganic materials 0.000 claims description 10
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 10
- 241001122767 Theaceae Species 0.000 claims description 10
- 150000001412 amines Chemical class 0.000 claims description 10
- 150000008442 polyphenolic compounds Chemical class 0.000 claims description 10
- 235000013824 polyphenols Nutrition 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 claims description 8
- 238000007254 oxidation reaction Methods 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000002277 temperature effect Effects 0.000 claims description 2
- 239000012782 phase change material Substances 0.000 abstract description 19
- 201000010099 disease Diseases 0.000 abstract description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000011232 storage material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The application discloses a preparation method of a composite shaping phase thinned aggregate for asphalt mixture, which comprises the following steps: weighing the prepared high-heat-conductivity antioxidant phase-change solution for standby, crushing waste cement concrete into fine aggregates with the particle size of 2.36-4.75 mm, cleaning the crushed fine aggregates with clear water until the water is clear, then drying the fine aggregates for 1-2 hours at 140-170 ℃, and then cleaning the fine aggregates by ultrasonic waves for standby; immersing the washed waste cement concrete fine aggregate in a high-heat-conductivity antioxidant phase change solution, heating to 140-200 ℃, adding absolute ethyl alcohol, and keeping the temperature in a constant-temperature and vacuum environment for 1-3 h; drying at normal temperature to eliminate surface attachment, mixing granular composite shaped fine aggregate into asphalt mixture in equal volume, and stirring. The application can ensure that the phase change material does not leak when phase change occurs, has proper phase change temperature, can effectively solve asphalt pavement diseases caused by higher temperature, and the used waste cement concrete can also play a role in recycling resources.
Description
Technical Field
The application belongs to the field of road engineering materials, in particular relates to a composite shaping phase change fine aggregate, and in particular relates to the technical field of asphalt mixture materials, and particularly relates to a preparation method of the composite shaping phase change fine aggregate for asphalt mixture.
Background
The asphalt pavement is used as a main pavement structure form, and has the advantages of comfort, flatness, small noise, easiness in repairing and the like. In summer, when the weather is hot, the surface temperature of the asphalt pavement is 60-70 ℃ in nature for a long time, rutting diseases are easy to form under the repeated action of vehicle load, and in addition, the black asphalt pavement can release a large amount of heat to the surrounding environment while absorbing sunlight heat, so that the urban heat island effect is further aggravated. In order to relieve or avoid asphalt pavement diseases caused by high temperature, a road worker selects a proper phase-change energy storage material to prepare a phase-change asphalt mixture for roads, the temperature of the road surface is actively reduced by adjusting a temperature field, the induction of rutting diseases is reduced, a certain effect is achieved, and researches show that the phase-change energy storage material has a wide prospect in road engineering. The existing phase change material curing mode often selects some high polymer or inorganic porous materials, has higher cost, can not meet a great deal of requirements of actual road engineering, often has a lower filling rate condition due to non-communication of gaps when the porous materials are adsorbed, has the condition that the phase change materials leak or the mechanical properties of asphalt mixtures are reduced due to phase change in the use process, and meanwhile, the phase change materials applied to the asphalt mixtures need to have enough stability.
At present, a phase change material shaping mode which can effectively reduce the temperature of a road surface, does not leak phase change, does not influence the performance of the road surface, and has the advantages of stable performance, low cost and large and easily available carrier quantity is needed.
Disclosure of Invention
The application aims at: aiming at the problems, the application provides a preparation method of a composite shaping phase thinned aggregate for asphalt mixture, and the fine aggregate can play the roles of reducing the pavement temperature and preventing the urban heat island effect on the premise of guaranteeing the pavement service performance, and the specific scheme of the application is as follows:
the application provides a preparation method of a composite setting phase-thinned aggregate for asphalt mixture, which comprises the following steps:
step 1, weighing the prepared high-heat-conductivity antioxidant phase-change solution for standby, crushing waste cement concrete into fine aggregates with the particle size of 2.36-4.75 mm by using a crusher, cleaning the crushed fine aggregates with clear water until the water is clear, then drying the fine aggregates for 1-2 hours at 140-170 ℃, and then cleaning the fine aggregates by using ultrasonic waves for standby;
step 2, immersing the waste cement concrete fine aggregate cleaned in the step 1 in a high-heat-conductivity antioxidant phase-change solution, heating to 140-200 ℃, adding a small amount of absolute ethyl alcohol, wherein the amount of the absolute ethyl alcohol is generally 2-6% based on polyethylene glycol 2000, keeping the temperature in a constant-temperature and vacuum environment for 1-3h, fishing out, drying at normal temperature for 24h, and removing attachments on the surface of the aggregate to obtain the granular composite shaped fine aggregate;
and 3, mixing the granular composite shaping fine aggregate prepared in the step 2 into the asphalt mixture in an equal volume mode, and stirring for 30-60 min to obtain the granular composite shaping phase fine aggregate.
The above scheme is further preferable, wherein the preparation of the high thermal conductivity oxidation resistant phase change solution in the step 1 includes the following steps:
step 11, weighing 55-60% of PEG2000 powder, 7-9% of butyl hydroxy anisole, 1-3% of amine antioxidant, 0.7-0.9% of tea polyphenol, 0.1-0.3% of boron nitride, 15-25% of silica sol solution and 9-15% of superfine graphite powder;
and 12, adding the PEG2000 powder in the step 11 into the silica sol solution, stirring the mixture at the temperature of 60 ℃ by using a stirrer until no solid particles exist, adding butyl hydroxy anisole, stirring the mixture for 10 to 15 minutes, finally adding amine antioxidants, tea polyphenol and boron nitride, stirring the mixture for 30 to 50 minutes, and standing the mixture to form the antioxidant composite phase change shaping material solution.
And 13, adding ultrafine graphite powder into the antioxidant composite phase change shaping material solution in the step 12, and stirring for 15-30 min to uniformly disperse the ultrafine graphite powder in the solution to obtain the high-heat-conductivity antioxidant composite phase change shaping material solution.
The above scheme is further preferable, wherein the step of ultrasonic cleaning the waste cement concrete fine aggregate in the step 1 comprises the following steps:
step 21, placing the waste cement concrete fine aggregate into a cleaning basket of a cleaning machine, placing the cleaning basket into a cleaning tank, adding clear water, wherein the water level in the cleaning tank is not lower than 60mm at the lowest and not higher than 80mm at the highest;
step 22, setting the frequency of ultrasonic cleaning at 25kHz, controlling the temperature at 60 ℃, and starting cleaning for 0.8-1.5 h;
and step 23, placing the cleaned waste cement concrete fine aggregate in an oven at 80 ℃ for drying for 4-6 hours.
The above scheme is further preferable, wherein the grading of the asphalt mixture in the step 3 is AC-20.
The above scheme is further preferable, and in the step 3, the method further comprises the step of carrying out phase transition temperature effect test on the granular composite shaped phase-thinned aggregate, wherein the phase transition temperature is between 40 and 65 ℃, and the phase transition latent heat is more than 100J/g.
The preparation method of the application prepares the composite shaped phase change fine aggregate applied to the asphalt mixture; the composite shaping phase change fine aggregate is applied to asphalt mixture.
According to the application, polyethylene glycol 2000 (PEG 2000) and silica sol are mixed according to a certain mass ratio, superfine graphite powder and an antioxidant are mixed in a certain proportion, the mixture is stirred uniformly, the mixture is heated to 140-200 ℃, a small amount of absolute ethyl alcohol is added, waste cement concrete recycled fine aggregate is mixed, the temperature is kept at 150 ℃ and the vacuum environment is maintained for 1-3h. PEG2000/SiO 2 Adsorbing the mixture into waste cement concrete recycled fine aggregate to prepare a granular composite shaping material, and making the granular composite shaping material have the same volume (or replaceFine aggregate) is mixed and stirred in the asphalt mixture, so that a shaped phase thinned aggregate is obtained, the shaped phase thinned aggregate is applied to the asphalt mixture, the effect of reducing the pavement temperature can be achieved, the phase change material is prevented from leaking when phase change occurs, the phase change temperature is proper, the phase change latent heat is high, asphalt pavement diseases caused by high temperature can be effectively solved, and meanwhile, the used waste cement concrete can also play a role in recycling resources; in order to improve the oxidation resistance of the composite shaping phase change material, the application selects the high-temperature-resistant and high-oxidation-resistance butyl hydroxy anisole; in order to improve the heat conductivity of the composite shaped phase change material, ultrafine graphite powder with high heat conductivity and small particle size is selected, and the ultrafine graphite powder is mixed with silica sol solution to prepare high-heat-conductivity antioxidant phase change solution, so that the primary solidification effect is achieved. In order to further fix the phase change material, waste cement concrete with low cost and large quantity is selected, fine aggregates made of the waste cement concrete have large porosity, can play a role in adsorption, and the waste cement concrete regenerated aggregates subjected to ultrasonic cleaning have large porosity, are mutually communicated and have strong capability of adsorbing the phase change material, play a secondary curing role after adsorbing the high-heat-conductivity antioxidant phase change solution, ensure that the phase change material stably exists in asphalt mixture, more effectively regulate the temperature and ensure other service performances of the pavement.
In summary, compared with the prior art, the application has the following beneficial effects:
the composite shaped phase change aggregate prepared by twice curing the phase change material can directly replace the fine aggregate in the asphalt mixture, has no leakage state, can effectively regulate the temperature, has the effects of reducing the pavement temperature and preventing the urban heat island effect on the premise of guaranteeing the pavement service performance, and further limits the replacement amount of the phase change aggregate due to the fact that the mechanical property of the phase change fine aggregate is poorer than that of the common aggregate when the phase change aggregate is replaced, and the temperature regulating capability is limited to a certain extent.
Drawings
FIG. 1 is a graph showing the comparison of the thermal conductivity coefficients of the composite phase change shaped aggregate and the common fine aggregate according to the application under the test of a thermal conductivity coefficient meter, and the thermal conductivity coefficient of the composite phase change aggregate is 30% higher than that of the common aggregate;
FIG. 2 is a temperature profile of temperature monitoring of a rutting specimen with a conventional AC-20 rutting specimen without phase change material incorporated therein by a temperature sensor externally connected with a temperature recorder in summer high temperature weather;
FIG. 3 is a comparative graph of the porosity test of the washed waste cement concrete fine aggregate and the unwashed waste cement concrete fine aggregate according to the present application, and it can be seen from the graph that ultrasonic washing can effectively improve the porosity of the waste cement concrete fine aggregate by 15%;
Detailed Description
The following description will be made clearly and fully with reference to the technical solutions in the embodiments, and it is apparent that the described embodiments are only examples of some of the present application, not all of them. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without any inventive effort, are intended to be within the scope of the application.
Example 1:
the preparation method of the composite setting phase-thinned aggregate for asphalt mixture provided by the application comprises the following steps:
step 1: weighing the prepared high-heat-conductivity oxidation-resistant phase-change solution for standby, crushing waste cement concrete into fine aggregates with the particle size of 4.75mm by using a crusher, cleaning the crushed fine aggregates with clear water until the water is clear, drying at 170 ℃ for 1h, and then cleaning with ultrasonic waves for standby;
step 2: soaking the waste cement concrete fine aggregate washed in the step 1 in a high-heat-conductivity antioxidant phase change solution, heating to 140 ℃, adding a small amount of absolute ethyl alcohol, keeping the temperature in a constant-temperature and vacuum environment for 3 hours, fishing out, drying for 24 hours at normal temperature, and removing attachments on the surface of the aggregate to obtain the granular composite shaped fine aggregate;
in the application, the preparation of the high-heat-conductivity antioxidant phase-change solution comprises the following steps:
step 11: 55% of PEG2000 powder, 9% of butyl hydroxy anisole, 1% of amine antioxidant, 0.9% of tea polyphenol, 0.1% of boron nitride, 25% of silica sol solution and 9% of superfine graphite powder are weighed.
Step 12: adding the PEG2000 powder in the step 11 into the silica sol solution, stirring at 60 ℃ by using a stirrer until no solid particles exist, adding butyl hydroxy anisole, stirring for 15min, finally adding amine antioxidants, tea polyphenol and boron nitride, and stirring for 30min to obtain the antioxidant composite phase change shaping material solution.
Step 13: adding superfine graphite powder into the antioxidant composite phase change shaping material solution in the step 12, and stirring for 15min to uniformly disperse the superfine graphite powder in the solution to prepare the high-heat-conductivity antioxidant composite phase change shaping material solution;
step 3: mixing the granular composite shaping fine aggregate prepared in the step 2 into asphalt mixture in an equal volume mode, and stirring for 60min to obtain granular composite shaping phase fine aggregate;
example 2:
the preparation method of the composite set phase-thinned aggregate of the embodiment is carried out according to the following steps:
step 1: weighing the prepared high-heat-conductivity oxidation-resistant phase-change solution for standby, crushing waste cement concrete into fine aggregates with the particle size of 2.36mm by using a crusher, cleaning the crushed fine aggregates with clear water until the water is clear, drying at 140 ℃ for 2 hours, and then cleaning with ultrasonic waves for standby;
step 2: soaking the waste cement concrete fine aggregate washed in the step 1 in a high-heat-conductivity antioxidant phase change solution, heating to 200 ℃, adding a small amount of absolute ethyl alcohol, keeping the temperature in a constant-temperature and vacuum environment for 1h, fishing out, drying for 24h at normal temperature, and removing attachments on the surface of the aggregate to obtain the granular composite shaped fine aggregate; wherein: the preparation of the high-heat-conductivity antioxidant phase change solution comprises the following steps:
step 11: 60% of PEG2000 powder, 7% of butyl hydroxy anisole, 2% of amine antioxidant, 0.7% of tea polyphenol, 0.3% of boron nitride, 15% of silica sol solution and 15% of superfine graphite powder are weighed.
Step 12: adding the PEG2000 powder in the step 11 into a silica sol solution, stirring at 50 ℃ by using a stirrer until no solid particles exist, adding butyl hydroxy anisole, stirring for 10min, finally adding amine antioxidants, tea polyphenol and boron nitride, and stirring for 50min to obtain an antioxidant composite phase change shaping material solution;
step 13: adding superfine graphite powder into the antioxidant composite phase change shaping material solution in the step 12, and stirring for 15min to uniformly disperse the superfine graphite powder in the solution to prepare the high-heat-conductivity antioxidant composite phase change shaping material solution.
Step 3: mixing the granular composite shaping fine aggregate prepared in the step 2 into asphalt mixture in an equal volume mode, and stirring for 30min to obtain the granular composite shaping phase fine aggregate.
Example 3:
the preparation method of the composite set phase-thinned aggregate of the embodiment is carried out according to the following steps:
step 1: weighing the prepared high-heat-conductivity oxidation-resistant phase-change solution for standby, crushing waste cement concrete into fine aggregates with the particle size of 3.65mm by using a crusher, cleaning the crushed fine aggregates with clear water until the water is clear, then drying for 1.5 hours at 150 ℃, and then cleaning by using ultrasonic waves for standby;
step 2: soaking the waste cement concrete fine aggregate washed in the step 1 in a high-heat-conductivity oxidation-resistant phase change solution, heating to 180 ℃, adding a small amount of absolute ethyl alcohol, keeping the temperature in a constant-temperature and vacuum environment for 2.5 hours, fishing out, drying for 24 hours at normal temperature, and removing attachments on the surface of the aggregate to obtain the granular composite shaped fine aggregate;
wherein: the preparation of the high-heat-conductivity antioxidant phase change solution comprises the following steps:
step 11: 57% of PEG2000 powder, 8% of butyl hydroxy anisole, 3% of amine antioxidant, 0.8% of tea polyphenol, 0.2% of boron nitride, 19% of silica sol solution and 12% of superfine graphite powder are weighed.
Step 12: adding PEG2000 powder in the step 11 into a silica sol solution, stirring at 50 ℃ by using a stirrer until no solid particles exist, adding butyl hydroxy anisole, stirring for 13min, finally adding amine antioxidants, tea polyphenol and boron nitride, and stirring for 40min to obtain the antioxidant composite phase change shaping material solution.
Step 13: adding superfine graphite powder into the antioxidant composite phase change shaping material solution in the step 12, and stirring for 24min to uniformly disperse the superfine graphite powder in the solution to prepare the high-heat-conductivity antioxidant composite phase change shaping material solution.
Step 3: mixing the granular composite shaping fine aggregate prepared in the step 2 into asphalt mixture in an equal volume mode, and stirring for 45min to obtain the granular composite shaping phase fine aggregate.
Example 4:
the waste cement concrete aggregate is cleaned according to the following steps:
step 21: weighing 500g of waste cement concrete fine aggregate, placing the waste cement concrete fine aggregate into a cleaning basket of a cleaning machine, placing the cleaning basket into a cleaning tank, and adding clear water; the water level must not be lower than 60mm at the lowest and not exceed 80mm at the highest.
Step 22: the cleaning frequency is set to 25kHz, the cleaning time is 0.8-2 h (preferably 1-1.2 h), the temperature is controlled to 55 ℃, and the cleaning is started.
Step 23: and (5) placing the washed waste cement concrete fine aggregate in a 70 ℃ oven for drying for 7 hours.
Example 5:
the waste cement concrete aggregate is cleaned according to the following steps:
step 21: weighing 1000g of waste cement concrete fine aggregate, putting the waste cement concrete fine aggregate into a cleaning basket of a cleaning machine, putting the cleaning basket into a cleaning tank, and adding clear water; the water level must not be lower than 70mm at the lowest and must not exceed 100mm at the highest.
Step 22: setting the cleaning frequency at 25kHz and the cleaning time at 2h, controlling the temperature at 65 ℃ and starting cleaning.
Step 23: and (3) placing the washed waste cement concrete fine aggregate in an oven at 80 ℃ for drying for 4 hours.
Example 6:
the thermal conductivity of the composite phase-change shaped aggregate prepared in example 1 was tested by a thermal conductivity meter, and compared with that of the common fine aggregate, as can be seen from fig. 1, the thermal conductivity of the composite phase-change aggregate was 30% higher than that of the common aggregate. And adopting a temperature sensor external temperature recorder to monitor the temperature of the composite phase-change temperature-regulating asphalt mixture rutting test piece and the common AC-20 rutting test piece which is not doped with the phase-change material in summer high Wen Tianqi, and measuring a temperature curve as shown in figure 2. As can be seen from fig. 2, the temperature rising rates of the prepared composite phase-change temperature-regulating asphalt mixture and the matrix asphalt mixture are kept consistent in the initial temperature rising period, when the temperature rises to about 44 ℃, the temperature rising rate changes, the temperature rising rate of the phase-change temperature-regulating asphalt mixture is smaller than that of the common modified asphalt mixture, which indicates that when the temperature reaches the phase change point of the phase-change material, the phase-change material absorbs heat in a phase-change manner, the temperature rising rate of the mixture is slowed down, and the composite shaped phase-change aggregate can play a role in slowing down the temperature rising of an asphalt mixture test piece; the phase change temperature of the composite phase change material is between 40 and 65 ℃, the phase change latent heat is greater than 100J/g, when the temperature of an asphalt pavement is increased due to overhigh environmental temperature, after the temperature is higher than the phase change temperature of the phase change material, the phase change material is subjected to phase change, part of heat is absorbed, the temperature of the asphalt pavement is reduced, and the occurrence time and duration of extremely low temperature are delayed and shortened by actively regulating and controlling the temperature of the asphalt pavement under the condition of temperature change, so that the problems caused by the high temperature of the asphalt pavement can be effectively solved, the urban heat island effect is prevented, and meanwhile, the used waste cement concrete also plays a role in recycling resources; in the application, a composite phase-change temperature-regulating asphalt mixture rutting test piece is prepared according to the following steps, and fine aggregate is added into asphalt for testing: firstly, 5 parts of the composite phase-change aggregate of the embodiment 1 and 95 parts of the AC-20 graded stone are placed in a 60-70 ℃ oven to be dried for standby; secondly, 5 parts of SBS modified asphalt are placed in an oven with the temperature of 160-200 ℃ (preferably 170-180 ℃) to be preheated for an hour to a flowing state; thirdly, adding the dried and preheated composite phase-change aggregate, stone and modified asphalt into a mixing pot with the preheating temperature of the asphalt mixture of 160-200 ℃ (preferably 180 ℃) for mixing for 30-40 min, adding 5 parts of mineral powder, and continuing mixing; finally, molding by using a rutting molding instrument according to the manufacturing method of the asphalt mixture test piece in Highway engineering asphalt and asphalt mixture test procedure to obtain a composite phase-change temperature-regulating asphalt composite mixing rutting test piece; according to the JTG E42-2005 highway engineering aggregate test procedure, the porosity test is carried out on the washed waste cement concrete fine aggregate and the unwashed waste cement concrete fine aggregate in the embodiment, as shown in fig. 3, and as can be seen from fig. 3, the ultrasonic washing can effectively improve the porosity of the waste cement concrete fine aggregate by 15%.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the application.
Claims (6)
1. The preparation method of the composite shaping phase change fine aggregate for the asphalt mixture is characterized by comprising the following steps of 1, weighing the prepared high-heat-conductivity oxidation-resistant phase change solution for standby, crushing waste cement concrete into fine aggregate with the particle size of 2.36-4.75 mm by using a crusher, cleaning the crushed fine aggregate with clear water until the water is clear, then drying for 1-2 hours at 140-170 ℃, and then cleaning by using ultrasonic waves for standby; the preparation of the high-heat-conductivity antioxidant phase change solution comprises the following steps:
step 11, weighing 55-60% of PEG2000 powder, 7-9% of butyl hydroxy anisole, 1-3% of amine antioxidant, 0.7-0.9% of tea polyphenol, 0.1-0.3% of boron nitride, 15-25% of silica sol solution and 9-15% of superfine graphite powder;
step 12, adding the PEG2000 powder in the step 11 into a silica sol solution, stirring the mixture at 50-60 ℃ by using a stirrer until no solid particles exist, adding butyl hydroxy anisole, stirring the mixture for 10-15min, finally adding an amine antioxidant, tea polyphenol and boron nitride, stirring the mixture for 30-50 min, and standing the mixture to form an antioxidant composite phase change shaping material solution;
step 13, adding superfine graphite powder into the antioxidant composite phase change shaping material solution in step 12, and stirring for 15-30 min to uniformly disperse the superfine graphite powder in the solution to obtain the high-heat-conductivity antioxidant composite phase change shaping material solution
Step 2, soaking the waste cement concrete fine aggregate washed in the step 1 in a high-heat-conductivity and oxidation-resistant phase change solution, heating to 140-200 ℃, adding absolute ethyl alcohol, keeping the temperature in a constant-temperature and vacuum environment for 1-3h, fishing out, drying for 24h at normal temperature, and removing attachments on the surface of the aggregate to obtain the granular composite shaped fine aggregate;
and 3, mixing the granular composite shaping fine aggregate prepared in the step 2 into the asphalt mixture in an equal volume mode, and stirring for 30-60 min to obtain the granular composite shaping phase fine aggregate.
2. The preparation method according to claim 1, characterized in that: the step of ultrasonic cleaning of the waste cement concrete fine aggregate in the step 1 comprises the following steps:
step 21, placing the waste cement concrete fine aggregate into a cleaning basket of a cleaning machine, placing the cleaning basket into a cleaning tank, adding clear water, wherein the water level in the cleaning tank is not lower than 60mm at the lowest and not higher than 80mm at the highest;
step 22, setting the frequency of ultrasonic cleaning at 25kHz, controlling the temperature at 60-65 ℃, and starting cleaning for 0.8-2 hours;
and step 23, placing the cleaned waste cement concrete fine aggregate in an oven at 80 ℃ for drying for 4-6 hours.
3. The method of manufacturing according to claim 1, characterized in that: the grading of the asphalt mixture in the step 3 is AC-20.
4. The method of manufacturing according to claim 1, characterized in that: and in the step 3, the phase transition temperature effect test is carried out on the granular composite shaping phase-thinned aggregate, the phase transition temperature is between 40 and 65 ℃, and the phase transition latent heat is more than 100J/g.
5. The preparation method of any one of claims 1-4, wherein the composite shaped phase change fine aggregate is applied to asphalt mixture.
6. Use of the composite set phase-thinned aggregate of claim 5 in asphalt mixtures.
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