CN113307547A - Environment-friendly asphalt mixture and preparation method thereof - Google Patents
Environment-friendly asphalt mixture and preparation method thereof Download PDFInfo
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- CN113307547A CN113307547A CN202110642900.6A CN202110642900A CN113307547A CN 113307547 A CN113307547 A CN 113307547A CN 202110642900 A CN202110642900 A CN 202110642900A CN 113307547 A CN113307547 A CN 113307547A
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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
- C04B26/26—Bituminous materials, e.g. tar, pitch
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- 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
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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
- 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
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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
- 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
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- Chemical & Material Sciences (AREA)
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Abstract
The application relates to the technical field of asphalt mixture preparation, and particularly discloses an environment-friendly asphalt mixture and a preparation method thereof. The environment-friendly asphalt mixture comprises the following components in parts by weight: 2000 portions of fine aggregate and 2500 portions of fine aggregate; 2500 portions of coarse aggregate 2000-; 150 portions of mineral powder and 200 portions of mineral powder; 250 portions of asphalt and 300 portions of; 50-80 parts of resin powder; 50-100 parts of an emulsifier; 0.6-1.2 parts of anti-stripping agent; 2000 portions of modified recycled aggregate and 2500 portions of modified recycled aggregate; the modified recycled aggregate is prepared by processing waste concrete blocks through the processes of crushing, acid washing, alkalization, modification, calcination and the like. The application of the environment-friendly asphalt mixture has the advantages of environmental protection, energy conservation, Marshall stability and high soaking residual stability by recycling the waste concrete blocks and matching with multiple modification process treatment.
Description
Technical Field
The application relates to the technical field of asphalt mixture preparation, in particular to an environment-friendly asphalt mixture and a preparation method thereof.
Background
The environment-friendly asphalt mixture is prepared by adding the building solid waste or old materials into the asphalt mixture according to a certain proportion after the building solid waste or the old materials are reprocessed and produced, so that the building solid waste or the old materials can replace a part of natural coarse aggregate to form a main framework in the asphalt mixture, and the mixture can meet the performance requirement for roads. By using the construction waste such as waste concrete as recycled aggregate after crushing treatment, the development of construction industry and building material industry can be organically combined with ecological environment protection and environmental pollution treatment, thereby obtaining economic benefit, simultaneously consuming a large amount of garbage and reducing pollution and land occupation.
The preparation method of the recycled aggregate of the environment-friendly asphalt mixture in the related technology comprises the following steps of firstly breaking and scattering recycled waste concrete by a hammer, then screening the waste concrete into products with various specifications of 0-5mm, 5-10 mm, 10-20 mm and the like by a vibrating screen or a linear vibrating screen, and then adding new aggregate, new asphalt and a regenerant according to the proportion after metering to obtain the asphalt mixture for paving the road surface.
The recycled aggregate prepared by the preparation method mainly has the following defects that the crushed waste concrete blocks can generate micro cracks inside the crushed waste concrete blocks, so that the bearing capacity of the aggregate is weaker, the surface is rough due to the adhesion of residual impurities, the water absorption rate is high, and the oilstone ratio of the mixture can be increased to a certain extent, so that the asphalt mixture prepared by the recycled aggregate has low Marshall stability, and the phenomena of oil bleeding, rutting, cuddling and the like can be easily caused after the recycled aggregate is applied to asphalt road pavement.
Disclosure of Invention
In order to ensure the Marshall stability of the environment-friendly asphalt and prevent phenomena such as oil bleeding, rutting, crowding and the like from occurring in the application process of the environment-friendly asphalt, the application provides the environment-friendly asphalt mixture and the preparation method thereof.
In a first aspect, the present application provides an environment-friendly asphalt mixture, which adopts the following technical scheme:
the environment-friendly asphalt mixture comprises the following components in parts by weight:
2000 portions of fine aggregate and 2500 portions of fine aggregate;
2500 portions of coarse aggregate 2000-;
150 portions of mineral powder and 200 portions of mineral powder;
250 portions of asphalt and 300 portions of;
50-80 parts of resin powder;
50-100 parts of an emulsifier;
0.6-1.2 parts of anti-stripping agent;
2000 portions of modified recycled aggregate and 2500 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. firstly, heating the waste concrete blocks to 600-800 ℃, introducing high-pressure air, carrying out air cooling to room temperature, crushing and grinding, and screening crushed powder with the particle size of less than 10mm for later use;
b. b, placing the crushed powder prepared in the step a into a pickling solution, heating and stirring for 2-4h at the rotating speed of 200-80 ℃ and 400r/min, and taking out and drying for later use;
the pH value of the pickling solution is 3.0-5.0, and the pickling solution is a mixed aqueous solution consisting of one or more of phosphoric acid, oxalic acid and hydrochloric acid;
c. b, placing the crushed powder after the acid washing in the step b into an alkalizing solution, introducing nitrogen, stirring for 4-8h at the rotating speed of 200-400r/min, and taking out and drying for later use;
the pH value of the alkalization liquid is 9.0-10.0, and the alkalization liquid is a mixed water solution consisting of one or more of ethanol, sodium hydroxide, sodium silicate and calcium hydroxide;
d. putting the alkalized crushed powder in the step c into a modification solution, stirring for 1-2h at the rotating speed of 100-200r/min, taking out and drying to prepare modified crushed powder for later use;
the modified liquid is one or more of mixed colloidal aqueous solution of silicon dioxide powder, glass fiber, volcanic ash and kaolin;
e. calcining the modified crushed powder prepared in the step d for 4-6h at the temperature of 1600-1800 ℃, taking out and cooling to room temperature to prepare the modified recycled aggregate.
By adopting the technical scheme, the modified recycled aggregate prepared from the waste concrete blocks is added in the formula, so that the Marshall stability of the asphalt mixture can still keep a higher level while the asphalt mixture is environment-friendly and energy-saving, and then the phenomena of oil bleeding, rutting, crowding and the like on the pavement are not easy to occur in the using process.
After the waste concrete is subjected to temperature change treatment, the inner part and the surface of the waste concrete are cracked, the grinding efficiency is higher and micro cracks are not easy to generate during grinding and crushing, after the waste concrete is subjected to preparation processes such as acid washing, alkalization and the like, surface impurities of the waste concrete are washed away by acid, the alkalinity is strengthened, the waste concrete can be tightly combined with asphalt and is not easy to fall off when the waste concrete is used as aggregate, a compact and smooth porcelain-like porous combining surface can be formed on the surface of the aggregate soaked by the modification liquid after the aggregate is calcined, the combining force between the modified recycled aggregate and the asphalt is further increased by matching with the use of an anti-stripping agent, and the Marshall stability of the asphalt mixture is synergistically increased.
Preferably, the pickling solution in the step b is prepared from phosphoric acid, oxalic acid and hydrochloric acid according to the volume ratio of 1 (0.5-0.8): (0.2-0.3).
By adopting the technical scheme, the pickling agent prepared by mixing the phosphoric acid, the oxalic acid and the hydrochloric acid according to the proportion can clean sundries and the like on the surface of the crushed powder, which influence the bonding force, and meanwhile, the pickling agent is not easy to react with the crushed powder, the strength of the pickling agent is not easy to influence, and the bearing strength of the modified aggregate is further ensured.
Preferably, the alkalizing liquid in the step c is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide according to a weight ratio of 1: (0.2-0.3): (0.05-0.15): (0.05-0.15): (0.05-0.10).
By adopting the technical scheme, the alkalization liquid prepared by mixing the ethanol, the sodium hydroxide, the sodium silicate and the calcium hydroxide according to the proportion can react with calcium compounds in the waste concrete to generate a large amount of three-dimensional calcium stone crystals distributed in a tendril shape on the outer side of the crushed powder, so that the strength and the hardness of the crushed powder are improved, and the bearing strength of the modified aggregate is further improved.
Preferably, the modifying solution in the step d is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to a weight ratio of 1: (0.2-0.3): (0.2-0.3): (0.1-0.2): (0.1-0.2).
By adopting the technical scheme, the modified liquid prepared by mixing the silicon dioxide powder, the glass fiber, the volcanic ash and the kaolin according to the proportion can be preliminarily adsorbed and combined with the tendril-like calcium stone crystals generated on the surfaces of the crushed powder after stirring and soaking, and a compact and smooth porcelain-like porous combination surface can be formed on the surfaces of the modified crushed powder after the modified crushed powder is treated by a calcining process, so that the modified crushed powder can be closely combined with the asphalt and has low water absorption rate, and the optimal oilstone ratio of the mixture is ensured.
Preferably, the emulsifier is prepared from polyvinyl alcohol, polyethylene wax, sodium citrate and sodium stearate in a weight ratio of 1: (0.5-0.8): (0.05-0.10): (0.05-0.10).
By adopting the technical scheme, the emulsifier prepared by mixing the polyvinyl alcohol, the polyethylene wax, the sodium citrate and the sodium stearate according to the proportion reduces the interfacial tension of each component in an asphalt mixture system, and simultaneously can form a firmer polar film on the surface of the mixture, prevent the mixture from aggregating with each other to a certain extent, and further ensure the uniform mixing of the asphalt mixture.
Preferably, the anti-stripping agent is composed of one or more of polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder.
By adopting the technical scheme, any one of polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder in the anti-stripping agent can form physical adsorption on the surface of the aggregate or carry out chemical combination reaction with the aggregate by means of a special chemical structure of the aggregate, and strong and powerful chemical ties are formed between the components, so that the adhesion between the asphalt and the aggregate is improved.
Preferably, the anti-stripping agent is prepared from polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder according to the weight ratio of 1 (0.3-0.5): (0.2-0.3): (0.1-0.15): (0.1-0.15): (0.05-0.10).
By adopting the technical scheme, the antistripping agent prepared by mixing the polyethylene glycol, the stearic acid, the sodium dodecyl sulfate, the nano calcium carbonate and the yttrium chloride powder according to the proportion can enhance the bonding strength of the aggregate surface and the asphalt by forming a large amount of polar groups and nonpolar groups on the aggregate surface and the asphalt, has strong thermal stability, is not easy to be decomposed by heat, and further ensures the bonding force and the adhesiveness of the asphalt and the aggregate.
In a second aspect, the present application provides a method for preparing an environment-friendly asphalt mixture, which adopts the following technical scheme: the preparation method of the environment-friendly asphalt mixture comprises the following steps:
s1, mixing the coarse aggregate, the modified recycled aggregate, the fine aggregate and the mineral powder into mixed aggregate;
s2, carrying out hot melting treatment on the mixed aggregate prepared in the S1, asphalt, an emulsifier and resin powder, mixing and stirring uniformly, and adding an anti-stripping agent in the stirring process to obtain the environment-friendly asphalt mixture.
By adopting the technical scheme, the preparation process of the asphalt mixture prepared by hot-melt blending is convenient to control, the asphalt mixture is suitable for large-scale industrial production, and the bonding force between asphalt and aggregate is strong.
Preferably, the hot melt processing in S2 includes the following steps:
primary hot melting: preheating the asphalt to 190-200 ℃, and then continuously heating for 10-15 min;
secondary hot melting: cooling the first-stage hot-melted asphalt to 170-180 ℃, adding resin powder and an emulsifier into the asphalt, and stirring at the rotating speed of 1000 r/min-800-10 min to prepare mixed asphalt;
three-stage hot melting: adding mixed aggregate into the secondary hot-melted mixed asphalt, stirring for 5-10min at the rotating speed of 1500r/min for 1000-.
By adopting the technical scheme, the asphalt mixture prepared by graded hot melting has higher uniformity, less air content in the asphalt mixture and higher Marshall stability, and thus the crack resistance of the asphalt mixture after paving is enhanced.
In summary, the present application has the following beneficial effects:
1. the Marshall stability of the prepared environment-friendly asphalt mixture is guaranteed by adding the modified recycled aggregate, the modified recycled aggregate is green and environment-friendly, the modified recycled aggregate is prepared from waste concrete through processes of crushing, pickling, alkalization, modification, calcination and the like, the modified recycled aggregate is not easily affected by the pH value of the modified recycled aggregate, and the modified recycled aggregate is combined with asphalt more firmly, so that the anti-cracking performance of the asphalt in application is improved;
2. according to the application, a large number of polar groups and nonpolar groups with thermal stability are formed on the surface of the aggregate and the asphalt by adding the anti-stripping agent, so that the connection strength between the asphalt and the aggregate is further enhanced;
3. according to the preparation method of the environment-friendly asphalt mixture, the asphalt mixture is prepared by adopting a grading hot melting and mixing mode, so that the uniformity degree is higher, the air content in the asphalt mixture is lower, the preparation process condition is convenient to control, and the environment-friendly asphalt mixture with stable performance is suitable for large-scale production.
Detailed Description
The present application is described in further detail below.
The fine aggregate is natural medium sand in the area II, the fineness modulus is 2.5, the mud content is less than 0.8 percent, and the fine aggregate is used as the fine aggregate;
coarse aggregate, which is crushed stone with a grain size of 5-20mm in continuous gradation;
mineral powder, which is S95 grade slag powder, is purchased from a Dingwang mineral product processing factory in Lingshou county;
the asphalt is collected from Hebei culvert Kai energy science and technology development company Limited;
silicon dioxide powder purchased from Tantai micro-nano chemical plant of shouguang city, Shandong province;
glass fiber, purchased from wuhe county weijia composite limited;
volcanic ash, purchased from Baidatong mineral processing factory, Lingshu county;
kaolin, purchased from the Prone mineral processing plant in Lingshou county;
polyvinyl alcohol, purchased from Henan Tian remuneration chemical products Co., Ltd;
polyethylene wax purchased from Shandong Liang New Material science and technology Co., Ltd;
sodium stearate, purchased from Shandong Liang New Material science and technology, Inc.;
polyethylene glycol purchased from Haian petrochemical plants of Jiangsu province;
stearic acid, industrial grade, purchased from environment friendly science and technology limited of Wandebeng, Jinan;
sodium dodecyl sulfate, purchased from Shandong Liang New Material science and technology Co., Ltd;
nano calcium carbonate, purchased from city china nano materials ltd;
yttrium chloride powder was purchased from Shandong Liang New Material science and technology Co.
Preparation example
Preparation example 1
A modified recycled aggregate is prepared by the following steps:
a. heating the waste concrete blocks to 600 ℃, introducing high-pressure air, cooling the waste concrete blocks to room temperature in an air cooling mode, putting the waste concrete blocks into a ball mill, crushing and grinding the waste concrete blocks, and screening crushed powder with the particle size of less than 10mm for later use;
b. b, putting the crushed powder prepared in the step a into a thermal stirring kettle filled with pickling solution, heating and stirring for 2 hours at the rotating speed of 200r/min at the temperature of 60 ℃, and taking out and drying for later use;
the pickling solution is prepared from phosphoric acid, oxalic acid and hydrochloric acid according to the volume ratio of 1: 0.5: 0.2, the pH value of the pickling solution is 5.0;
c. b, putting the crushed powder after the acid washing in the step b into a hot stirring kettle filled with an alkalization solution, introducing nitrogen, stirring for 4 hours at the rotating speed of 200r/min, and taking out and drying for later use;
the alkalization liquid is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide according to the weight ratio of 1: 0.2: 0.05: 0.05: 0.05, the pH of the alkalizing liquid is 9.0;
d. c, putting the alkalized crushed powder in the step c into a thermal stirring kettle filled with a modification solution, stirring for 1h at the rotating speed of 100r/min, taking out and drying to prepare modified crushed powder for later use;
the modified liquid is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to the weight ratio of 1: 0.2: 0.2: 0.1: 0.1;
e. and d, calcining the modified crushed powder prepared in the step d at 1600 ℃ for 4 hours, taking out the calcined powder and cooling the calcined powder to room temperature to obtain the modified recycled aggregate.
Preparation example 2
a. Firstly, heating waste concrete blocks to 700 ℃, introducing high-pressure air, cooling the waste concrete blocks to room temperature in an air cooling mode, putting the waste concrete blocks into a ball mill, crushing and grinding the waste concrete blocks, and screening crushed powder with the particle size smaller than 10mm for later use;
b. b, putting the crushed powder prepared in the step a into a thermal stirring kettle filled with pickling solution, heating and stirring for 3 hours at the rotating speed of 300r/min at the temperature of 70 ℃, and taking out and drying for later use;
the pickling solution is prepared from phosphoric acid, oxalic acid and hydrochloric acid according to the volume ratio of 1: 0.5: 0.2, the pH value of the pickling solution is 3.0;
c. b, putting the crushed powder after the acid washing in the step b into a hot stirring kettle filled with an alkalization solution, introducing nitrogen, stirring for 6 hours at the rotating speed of 300r/min, and taking out and drying for later use;
the alkalization liquid is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide according to the weight ratio of 1: 0.2: 0.05: 0.05: 0.05, and the pH of the alkalizing liquid is 9.5;
d. c, putting the alkalized crushed powder in the step c into a thermal stirring kettle filled with a modification solution, stirring for 1.5 hours at the rotating speed of 150r/min, taking out and drying to prepare modified crushed powder for later use;
the modified liquid is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to the weight ratio of 1: 0.2: 0.2: 0.1: 0.1;
e. and d, calcining the modified crushed powder prepared in the step d at 1700 ℃ for 5 hours, taking out the calcined powder and cooling the calcined powder to room temperature to obtain the modified recycled aggregate.
Preparation example 3
a. Firstly, heating waste concrete blocks to 800 ℃, introducing high-pressure air, cooling the waste concrete blocks to room temperature in an air cooling mode, putting the waste concrete blocks into a ball mill, crushing and grinding the waste concrete blocks, and screening crushed powder with the particle size smaller than 10mm for later use;
b. b, putting the crushed powder prepared in the step a into a thermal stirring kettle filled with pickling solution, heating and stirring for 4 hours at the rotating speed of 400r/min at the temperature of 80 ℃, and taking out and drying for later use;
the pickling solution is prepared from phosphoric acid, oxalic acid and hydrochloric acid according to the volume ratio of 1: 0.5: 0.2, the pH value of the pickling solution is 5.0;
c. b, putting the crushed powder after the acid washing in the step b into a hot stirring kettle filled with an alkalization solution, introducing nitrogen, stirring for 8 hours at the rotating speed of 400r/min, and taking out and drying for later use;
the alkalization liquid is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide according to the weight ratio of 1: 0.2: 0.05: 0.05: 0.05, the pH of the alkalizing liquid is 10.0;
d. c, putting the alkalized crushed powder in the step c into a thermal stirring kettle filled with a modification solution, stirring for 1.5 hours at the rotating speed of 200r/min, taking out and drying to prepare modified crushed powder for later use;
the modified liquid is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to the weight ratio of 1: 0.2: 0.2: 0.1: 0.1;
e. and d, calcining the modified crushed powder prepared in the step d at 1800 ℃ for 6 hours, taking out the calcined powder and cooling the calcined powder to room temperature to obtain the modified recycled aggregate.
Preparation example 4
A preparation method of modified recycled aggregate is different from the preparation example 2 in that the pickling solution is prepared from phosphoric acid, oxalic acid and hydrochloric acid in a volume ratio of 1: 0.65: 0.25.
Preparation example 5
A preparation method of modified recycled aggregate is different from the preparation example 2 in that the pickling solution is prepared from phosphoric acid, oxalic acid and hydrochloric acid in a volume ratio of 1: 0.8: 0.3.
Preparation example 6
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the alkalizing liquid is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide in a weight ratio of 1: 0.25: 0.10: 0.10: 0.075 composition.
Preparation example 7
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the alkalizing liquid is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide in a weight ratio of 1: 0.3: 0.15: 0.15: 0.10.
Preparation example 8
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modifying liquid is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to the weight ratio of 1: 0.25: 0.25: 0.15: 0.15.
Preparation example 9
The preparation method of the modified recycled aggregate is different from the preparation example 2 in that the modifying liquid is prepared from water, silicon dioxide powder, glass fiber, volcanic ash and kaolin according to the weight ratio of 1: 0.3: 0.3: 0.2: 0.2.
Examples
Example 1
The environment-friendly asphalt mixture comprises the following components in parts by weight shown in Table 1 and is prepared by the following preparation steps:
s1, mixing the coarse aggregate, the modified recycled aggregate in the preparation example 1, the fine aggregate and the mineral powder into mixed aggregate;
s2, adding asphalt into a thermal stirring reaction kettle, preheating to 190 ℃, continuously heating for 10min, and performing primary hot melting to obtain hot-melt asphalt;
cooling the hot-melt asphalt to 170 ℃, adding resin powder and an emulsifier into the hot-melt asphalt, stirring at the rotating speed of 800r/min for 5min, and performing secondary hot melting to obtain mixed asphalt, wherein the emulsifier is a mid-crack cationic asphalt emulsifier BH-Z2 purchased from Shandong oil and grease chemical Co Ltd;
adding mixed aggregate into the mixed asphalt subjected to the second-stage hot melting, stirring for 5min at the rotating speed of 1000r/min, adding an anti-stripping agent after the temperature is reduced to 130 ℃, carrying out heat preservation stirring for 20min at the rotating speed of 400r/min, and carrying out third-stage hot melting to obtain the environment-friendly asphalt mixture, wherein the anti-stripping agent is FY asphalt anti-stripping agent purchased from Shandong Panya New Material Co.
Examples 2 to 6
An environment-friendly asphalt mixture was different from example 1 in that each component and the corresponding weight thereof are shown in table 1.
TABLE 1 Components and weights (kg) thereof in examples 1-6
Example 7
The environment-friendly asphalt mixture comprises the following components in parts by weight shown in Table 1 and is prepared by the following preparation steps:
s1, mixing the coarse aggregate, the modified recycled aggregate in the preparation example 1, the fine aggregate and the mineral powder into mixed aggregate;
s2, preheating the asphalt to 195 ℃, continuously heating for 12.5min, and performing primary hot melting to obtain hot-melt asphalt;
cooling the hot-melt asphalt to 175 ℃, adding resin powder and an emulsifier into the asphalt, stirring at the rotating speed of 900r/min for 7.5min, and performing secondary hot melting to obtain mixed asphalt, wherein the emulsifier is a median-splitting cationic asphalt emulsifier BH-Z2;
and adding mixed aggregate into the mixed asphalt subjected to the secondary hot melting, stirring for 7.5min at the rotating speed of 1250r/min, adding an anti-stripping agent after the temperature is reduced to 135 ℃, keeping the temperature and stirring for 25min at the rotating speed of 500r/min, and performing tertiary hot melting to obtain the environment-friendly asphalt mixture, wherein the anti-stripping agent is FY asphalt anti-stripping agent.
Example 8
The environment-friendly asphalt mixture comprises the following components in parts by weight shown in Table 1 and is prepared by the following preparation steps:
s1, mixing the coarse aggregate, the modified recycled aggregate in the preparation example 1, the fine aggregate and the mineral powder into mixed aggregate;
s2, preheating the asphalt to 200 ℃, continuously heating for 15min, and performing first-stage hot melting to obtain hot-melt asphalt;
cooling the hot-melt asphalt to 180 ℃, adding resin powder and an emulsifier into the asphalt, stirring at the rotating speed of 1000r/min for 10min, and carrying out secondary hot melting to prepare mixed asphalt, wherein the emulsifier is a median-splitting cationic asphalt emulsifier BH-Z2;
adding mixed aggregate into the mixed asphalt after the second-stage hot melting, stirring for 10min at the rotating speed of 1500r/min, adding the anti-stripping agent after the temperature is reduced to 140 ℃, keeping the temperature and stirring for 30min at the rotating speed of 600r/min, and carrying out third-stage hot melting to obtain the environment-friendly asphalt mixture, wherein the anti-stripping agent is FY asphalt anti-stripping agent.
Example 9
An environment-friendly asphalt mixture is different from that in example 1 in that the modified recycled aggregate prepared in preparation example 2 is used in the preparation process of the environment-friendly asphalt mixture.
Example 10
An environment-friendly asphalt mixture is different from that in example 1 in that the modified recycled aggregate prepared in preparation example 3 is used in the preparation process of the environment-friendly asphalt mixture.
Example 11
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 4 is used in the preparation process of the environment-friendly asphalt mixture.
Example 12
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 5 is used in the preparation process of the environment-friendly asphalt mixture.
Example 13
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 6 is used in the preparation process of the environment-friendly asphalt mixture.
Example 14
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 7 is used in the preparation process of the environment-friendly asphalt mixture.
Example 15
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 8 is used in the preparation process of the environment-friendly asphalt mixture.
Example 16
An environment-friendly asphalt mixture, which is different from that of example 1 in that the modified recycled aggregate prepared in preparation example 9 is used in the preparation process of the environment-friendly asphalt mixture.
Example 17
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in example 1 in that the emulsifier is prepared from polyvinyl alcohol, polyethylene wax, sodium citrate and sodium stearate in a weight ratio of 1: 0.5: 0.05: 0.05 composition.
Example 18
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in example 1 in that the emulsifier is prepared from polyvinyl alcohol, polyethylene wax, sodium citrate and sodium stearate in a weight ratio of 1: 0.65: 0.075: 0.075 composition.
Example 19
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in example 1 in that the emulsifier is prepared from polyvinyl alcohol, polyethylene wax, sodium citrate and sodium stearate in a weight ratio of 1: 0.8: 0.10: 0.10.
Example 20
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in the embodiment 1 in that the anti-stripping agent is prepared from polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder in a weight ratio of 1: 0.3: 0.2: 0.1: 0.1: 0.05 composition.
Example 21
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in the embodiment 1 in that the anti-stripping agent is prepared from polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder in a weight ratio of 1: 0.4: 0.25: 0.125: 0.125: 0.075 composition.
Example 22
The environment-friendly asphalt mixture is different from the environment-friendly asphalt mixture in the embodiment 1 in that the anti-stripping agent is prepared from polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder in a weight ratio of 1: 0.5: 0.3: 0.15: 0.15: 0.10.
Comparative example
Comparative example 1
An environment-friendly asphalt mixture is different from the embodiment 1 in that the recycled aggregate added into the asphalt mixture is waste concrete which is only subjected to crushing treatment.
Comparative example 2
The environment-friendly asphalt mixture is different from the embodiment 1 in that the preparation step a of the modified recycled aggregate comprises the following specific operations: and putting the waste concrete blocks into a ball mill, crushing and grinding, and screening crushed powder with the particle size of less than 10mm for later use.
Comparative example 3
An environment-friendly asphalt mixture, which is different from the asphalt mixture in example 1 in that the step b is not included in the step of preparing the modified recycled aggregate.
Comparative example 4
An environment-friendly asphalt mixture, which is different from the asphalt mixture in example 1 in that the step c is not included in the step of preparing the modified recycled aggregate.
Comparative example 5
An environment-friendly asphalt mixture, which is different from the example 1 in that the step of preparing the modified recycled aggregate does not comprise the step b and the step c.
Comparative example 6
An environment-friendly asphalt mixture, which is different from the example 1 in that the step of preparing the modified recycled aggregate does not comprise the step d and the step e.
Performance test
The asphalt mixtures obtained in examples 1 to 22 and comparative examples 1 to 6 were used as test objects, and the results were measured by a standardized compaction method to prepare standardized Marshall test pieces of 101.6 + -0.2 mm X63.5 + -1.3 mm, and the Marshall stability, flow value and water immersion residual stability were measured, respectively, and are shown in Table 2 below. The concrete test steps are carried out according to a method of road engineering asphalt and asphalt mixture test specification JTG E20-2011T 0709-2011.
Table 2 results of performance testing
As can be seen from the test data in Table 2, examples 1-22 all met JTF F40-2004 technical Specification for construction of road asphalt pavement during the test, all had Marshall stabilities greater than 8kN, and all had residual stabilities greater than 80% after immersion in water.
As can be seen by combining examples 1-8 and Table 2, the asphalt mixture prepared by the components in example 4 has the highest Marshall stability and highest soaking residue stability, and the asphalt mixture has the best performance; the asphalt mixture prepared by the preparation process in example 7 has the best performance improvement effect.
It can be seen from the combination of example 1, examples 9-16 and table 2 that the preparation process in preparation example 2 is the preferred process for modifying recycled aggregate, and the modified recycled aggregate prepared under the process conditions has the best performance effect on asphalt mixture, the marshall stability is improved by 6% compared with example 1, and the water immersion residual stability is improved by 5.2% compared with example 1.
It can be seen from the combination of example 1, examples 17-22 and Table 2 that example 18 and example 21 are the best mixture ratios of the added emulsifier and the anti-stripping agent, respectively, and have the best performance effect on the asphalt mixture, the Marshall stability is improved by 7% and 10% respectively compared with example 1, and the water immersion residual stability is improved by 6.1% and 8.7% respectively compared with example 1.
Combining example 1 and comparative example 1, and combining table 2, it can be seen that in comparative example 1, because the added recycled aggregate is not modified, the properties of the asphalt mixture are greatly reduced, the marshall stability is reduced by 4% compared with example 1, and the water immersion residual stability is reduced by 4.4% compared with example 1.
In combination with example 1 and comparative example 2, and table 2, it can be seen that comparative example 2 contains many fine cracks inside the prepared aggregate due to the preparation of the modified recycled aggregate without preheating and cooling the waste concrete, and the marshall stability and the water-soaking residual stability are slightly lowered compared to example 1.
Combining example 1 and comparative example 3, and combining table 2, it can be seen that in comparative example 3, since the step b is not included in the preparation process of the modified recycled aggregate, impurities on the surface of the modified aggregate are not well removed, and then the bonding force with asphalt is reduced, and the marshall stability and the soaking residual stability are slightly lowered compared to example 1.
In combination with example 1 and comparative example 4, and table 2, it can be seen that comparative example 3 has a slightly lower marshall stability and water immersion residue stability than example 1 because the modified recycled aggregate is prepared without c step, and the surface strength and load-bearing capacity of the modified aggregate are lower.
By combining the example 1 and the comparative example 5 and combining the table 2, it can be seen that in the comparative example 4, since the step b and the step c are not included in the preparation process of the modified recycled aggregate, the marshall stability and the soaking residual stability are both obviously reduced compared with the example 1, and the matching use of the acid washing process and the alkalization process is seen to be beneficial to the improvement of the performance of the asphalt mixture.
By combining example 1 and comparative example 6, and by combining table 2, it can be seen that the strength and adhesion ability of the modified recycled aggregate in example 1 are improved after the modified recycled aggregate is adhered and calcined by the modifying solution, and then the marshall stability and the water immersion residual stability of the asphalt mixture are respectively improved by 2.9% and 2.4% compared with example 1.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The environment-friendly asphalt mixture is characterized by comprising the following components in parts by weight:
2000 portions of fine aggregate and 2500 portions of fine aggregate;
2500 portions of coarse aggregate 2000-;
150 portions of mineral powder and 200 portions of mineral powder;
250 portions of asphalt and 300 portions of;
50-80 parts of resin powder;
50-100 parts of an emulsifier;
0.6-1.2 parts of anti-stripping agent;
2000 portions of modified recycled aggregate and 2500 portions of modified recycled aggregate;
the modified recycled aggregate is obtained by the following preparation steps:
a. firstly, heating the waste concrete blocks to 600-800 ℃, introducing high-pressure air, carrying out air cooling to room temperature, crushing and grinding, and screening crushed powder with the particle size of less than 10mm for later use;
b. b, placing the crushed powder prepared in the step a into a pickling solution, heating and stirring for 2-4h at the rotating speed of 200-80 ℃ and 400r/min, and taking out and drying for later use;
the pH value of the pickling solution is 3.0-5.0, and the pickling solution is a mixed aqueous solution consisting of one or more of phosphoric acid, oxalic acid and hydrochloric acid;
c. b, placing the crushed powder after the acid washing in the step b into an alkalizing solution, introducing nitrogen, stirring for 4-8h at the rotating speed of 200-400r/min, and taking out and drying for later use;
the pH value of the alkalization liquid is 9.0-10.0, and the alkalization liquid is a mixed water solution consisting of one or more of ethanol, sodium hydroxide, sodium silicate and calcium hydroxide;
d. putting the alkalized crushed powder in the step c into a modification solution, stirring for 1-2h at the rotating speed of 100-200r/min, taking out and drying to prepare modified crushed powder for later use;
the modified liquid is one or more of mixed colloidal aqueous solution of silicon dioxide powder, glass fiber, volcanic ash and kaolin;
e. calcining the modified crushed powder prepared in the step d for 4-6h at the temperature of 1600-1800 ℃, taking out and cooling to room temperature to prepare the modified recycled aggregate.
2. The environment-friendly asphalt mixture according to claim 1, wherein the pickling solution in the step b is prepared from phosphoric acid, oxalic acid and hydrochloric acid in a volume ratio of 1 (0.5-0.8): (0.2-0.3).
3. The environment-friendly asphalt mixture according to claim 1, wherein the alkalizing solution in the step c is prepared from water, ethanol, sodium hydroxide, sodium silicate and calcium hydroxide in a weight ratio of 1: (0.2-0.3): (0.05-0.15): (0.05-0.15): (0.05-0.10).
4. The environment-friendly asphalt mixture according to claim 1, wherein the modifying solution in the step d is prepared from water, silica powder, glass fiber, volcanic ash and kaolin according to a weight ratio of 1: (0.2-0.3): (0.2-0.3): (0.1-0.2): (0.1-0.2).
5. The environment-friendly asphalt mixture according to claim 1, wherein the emulsifier is a mixture of polyvinyl alcohol, polyethylene wax, sodium citrate and sodium stearate in a weight ratio of 1: (0.5-0.8): (0.05-0.10): (0.05-0.10).
6. The environment-friendly asphalt mixture according to claim 1, wherein the anti-stripping agent comprises one or more of polyethylene glycol, stearic acid and sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder.
7. The environment-friendly asphalt mixture according to claim 6, wherein the anti-stripping agent comprises polyethylene glycol, stearic acid, sodium dodecyl sulfate, nano calcium carbonate and yttrium chloride powder in a weight ratio of 1 (0.3-0.5): (0.2-0.3): (0.1-0.15): (0.1-0.15): (0.05-0.10).
8. The method for preparing the environment-friendly asphalt mixture according to any one of claims 1 to 7, which is characterized by comprising the following steps:
s1, mixing the coarse aggregate, the modified recycled aggregate, the fine aggregate and the mineral powder into mixed aggregate;
s2, carrying out hot melting treatment on the mixed aggregate prepared in the S1, asphalt, an emulsifier and resin powder, mixing and stirring uniformly, and adding an anti-stripping agent in the stirring process to obtain the environment-friendly asphalt mixture.
9. The method for preparing the environment-friendly asphalt mixture according to claim 8, wherein the hot-melt treatment in the step S2 comprises the following steps:
primary hot melting: preheating the asphalt to 190-200 ℃, and then continuously heating for 10-15 min;
secondary hot melting: cooling the first-stage hot-melted asphalt to 170-180 ℃, adding resin powder and an emulsifier into the asphalt, and stirring at the rotating speed of 1000 r/min-800-10 min to prepare mixed asphalt;
three-stage hot melting: adding mixed aggregate into the secondary hot-melted mixed asphalt, stirring for 5-10min at the rotating speed of 1500r/min for 1000-.
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