CN114940594A - Highway asphalt pavement aggregate and preparation method thereof - Google Patents
Highway asphalt pavement aggregate and preparation method thereof Download PDFInfo
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- CN114940594A CN114940594A CN202210403265.0A CN202210403265A CN114940594A CN 114940594 A CN114940594 A CN 114940594A CN 202210403265 A CN202210403265 A CN 202210403265A CN 114940594 A CN114940594 A CN 114940594A
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- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052642 spodumene Inorganic materials 0.000 claims abstract description 17
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- 238000002156 mixing Methods 0.000 claims description 6
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- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 15
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- 229910001385 heavy metal Inorganic materials 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 238000005507 spraying Methods 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
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- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
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- 230000004075 alteration Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
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- 238000004017 vitrification Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
Abstract
The invention particularly relates to a highway asphalt pavement aggregate and a preparation method thereof, belonging to the technical field of asphalt aggregates, wherein the aggregate comprises the following raw materials in percentage by mass: 40-60% of waste incineration fly ash, 30-45% of micro silicon powder and Na 2 CO 3 7% -10% of powder and/or 2% -3% of spodumene; the waste incineration fly ash is ground to obtain small particle diameter, and the glass-solidified waste incineration fly ash is used as an aggregate to improve the interface structure between the aggregate and asphalt in the asphalt pavement, so that the national standard requirement is met, various physical characteristics of the asphalt pavement can be obviously enhanced, and the concrete admixture meets the requirement of environmental protection.
Description
Technical Field
The invention belongs to the technical field of asphalt aggregates, and particularly relates to a highway asphalt pavement aggregate and a preparation method thereof.
Background
With the acceleration of urbanization process, the city wall has become an urgent problem to be solved, and the resource utilization of urban garbage has become the only way out. The waste incineration power generation is a means for recycling, reducing and effectively generating urban waste, but the waste incineration power generation process is accompanied by the problem of secondary environmental pollution, such as dioxin, incineration fly ash, stink and the like.
Disclosure of Invention
The application aims to provide a highway asphalt pavement aggregate and a preparation method thereof, so as to solve the problem of secondary pollution caused by fly ash incineration at present.
The embodiment of the invention provides a highway asphalt pavement aggregate, which comprises the following raw materials in percentage by mass:
40-60% of waste incineration fly ash,
30 to 45 percent of micro silicon powder and
Na 2 CO 3 7-10% of powder and/or 2-3% of spodumene.
Optionally, the aggregate further comprises the following raw materials in percentage by mass: 5 to 10 percent of kaolin.
Optionally, the aggregate comprises the following raw materials in percentage by mass: 45-55% of waste incineration fly ash, 35-40% of micro silicon powder and Na 2 CO 3 8 to 9 percent of powder, 2.3 to 2.7 percent of spodumene and 7 to 8 percent of kaolin.
Optionally, the chemical components of the waste incineration fly ash comprise, by mass: 20 to 35 percent of CaO and SiO 2 :11％-19％、 Al 2 O 3 :1％-7％、Na 2 O:4％-6％、K 2 O:4％-6％、Fe 2 O 3 :3％-4％、MgO:2％-4％、Cl:10％-25％、SO 3 :10％-25％。
Optionally, the aggregates comprise coarse aggregates and fine aggregates, the coarse aggregates have a particle size of 4.75mm-9.5mm, and the fine aggregates have a particle size of < 4.75 mm.
Based on the same inventive concept, the embodiment of the invention also provides a preparation method of the highway asphalt pavement aggregate, which comprises the following steps:
mixing the raw materials to obtain a mixture;
melting the mixture to obtain molten liquid;
carrying out water quenching and rapid cooling on the molten liquid to obtain a glass body;
crushing the glass body to obtain aggregate;
wherein the raw materials comprise waste incineration fly ash, micro silicon powder and Na 2 CO 3 Flour, spodumene and kaolin.
Optionally, the mixture is sieved by a 70-90 mesh sieve.
Optionally, the melting temperature is 750-1500 ℃, and the melting heat preservation time is 30-120 min; the heating rate of the melting is 5-10 ℃/min.
Optionally, the water quenching and quenching adopts a spraying process.
Optionally, the aggregate is sieved by a 1-5 mesh sieve.
Optionally, the coolant for water quenching and quenching is wastewater and/or sewage.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the highway asphalt pavement aggregate provided by the embodiment of the invention, the waste incineration fly ash is used for preparing the concrete admixture, the waste incineration fly ash amount can be obviously reduced, the compounds forming glassy substances in the waste incineration fly ash are used, the waste incineration fly ash solidified by glass is ground, the particle diameter of the waste incineration fly ash is smaller, and the waste incineration fly ash is used as an aggregate to improve the interface structure between the aggregate and asphalt in the asphalt pavement, so that the national standard requirement is met, various physical characteristics of the asphalt pavement can be obviously enhanced, and the environmental protection requirement is met.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the applicant finds in the course of the invention that: fly ash generated in urban waste incineration power generation mainly contains SiO 2 、CaO、Al 2 O 3 、 SO 3 、Cl - 、Fe 2 O 3 、K 2 O、Na 2 O、P 2 O 5 、CuO、ZnCl 2 Etc. fly ash component and Na 2 O-CaO-SiO 2 The glass phase is very similar and is an ideal raw material for preparing glass by melting, but the fly ash has high content of impurities such as heavy metal, chloride ions and the like, and the fly ash can be leached by the heavy metal ions and pollute soil around roads when being directly added into the asphalt pavement of the roads as an admixture.
The Chinese patent application CN112142371A discloses a solid waste asphalt mixture for concrete pavement and a preparation method thereof, wherein the solid waste asphalt mixture for concrete pavement is prepared from 4-9 parts of natural sand, 4-9 parts of machine-made sand, 12-27 parts of iron tailings, 38.5-52.5 parts of asbestos tailings, 16.5-22.5 parts of basalt aggregate, 4-6 parts of asphalt, 0.2-0.4 part of asphalt modifier, 3-5 parts of modified desulfurized ash and 2-3 parts of iron tailings sand. Wherein natural sand, machine-made sand, iron tailings, basalt and the like are used as the aggregate.
Chinese patent application CN 113045246A is a recycled asphalt pavement material made of waste glass fiber reinforced plastics and steel slag and its preparation method, the raw materials include: 4.5-7.5 parts of waste glass fiber reinforced plastic powder modified asphalt, 82-92 parts of aggregate, 4-10 parts of mineral powder and 0-0.5 part of fiber stabilizer, wherein: the aggregate is configured according to SMA-13 grading or AC-13 grade; in the aggregate, steel slag is used for replacing all stones with nominal particle sizes of 2.36-13.2 mm, and machine-made sand or stone chips are used for replacing fine aggregates with nominal particle sizes of below 2.36mm, so that resource saving and recycling of solid wastes are realized.
Chinese utility model patent application cn201620260593.x a high antiskid bituminous pavement structure with limestone as coarse aggregate, uses limestone as coarse aggregate in this system, and the bituminous pavement structure of invention has advantages such as noise reduction, alleviate dazzle light, alleviate heat island effect, material saving.
The national hazardous waste catalogue (2021 edition) HW18 incineration disposal residue has specifically classified "domestic waste incineration fly ash" as a hazardous waste, i.e. the waste incineration fly ash cannot be directly incorporated into concrete as an additive. After the waste incineration fly ash is vitrified through high-temperature melting, pollutants of the waste incineration fly ash are basically solidified and can not be treated as hazardous waste, and the application range is not limited.
GB/T41015-2021 technical requirements of vitrified treatment products of solid wastes clearly indicate that the vitrified treatment products can be used as roadbed materials, concrete aggregates, admixtures or cement mixing materials and the like after meeting the quality requirements of relevant industry standards and the content of leached harmful substances is within a standard range.
The micro silicon powder is derived from amorphous powdery silicon dioxide (SiO) obtained by oxidizing silicon steam discharged from a flue during smelting ferrosilicon and industrial silicon and collecting the oxidized silicon steam by a specially designed dust collector 2 ) The glass has the characteristics of wide source and low price, and can be used as a better additive in the high-temperature melting vitrification process.
The method comprises the steps of using waste incineration fly ash as a main raw material, adding the raw material to form a glass raw material, heating and melting the glass to generate glass, and crushing and sieving the glass to obtain a glass body serving as an aggregate of the highway asphalt pavement.
According to an exemplary embodiment of the present invention, there is provided an aggregate for highway asphalt pavement, the aggregate being prepared from a raw material in a mass percentageThe ratio of the components comprises: 40-60% of waste incineration fly ash, 30-45% of micro silicon powder and Na 2 CO 3 7-10% of powder and/or 2-3% of spodumene.
The waste incineration fly ash has higher CaO content, can play a good role in chemically stabilizing finished glass, and contains Ca 2+ The non-bridge oxygen is firmly linked in the glass structure, the integral compactness of the network is improved, and heavy metal ions can be effectively prevented from leaking out from the gaps of the network. However, an excessively high CaO content increases the tendency of the glass to crystallize and increases the brittleness of the glass.
Silica fume as SiO in mixture 2 The source of (2) is supplemented.
Na 2 CO 3 The powder is used as Na in the mixture 2 The O source is supplemented to reduce the melting temperature of the mixture.
Spodumene can lower the melting temperature and shorten the time required for glass melting and fining.
The realized raw materials are as follows: burning the above garbage to obtain fly ash, micro silicon powder, and Na 2 CO 3 The mixture constituting the glass phase, i.e. Na 2 O-CaO-SiO 2 Glass system phase, whereby Na 2 O-CaO-SiO 2 The mixture is fired at high temperature to form glass.
In some embodiments, the aggregate further comprises, in mass percent: 5 to 10 percent of kaolin.
The addition of kaolin can increase Al in the mixture 2 O 3 The content of the fly ash can be formed by CaO-Al with the fly ash from the waste incineration 2 O 3 -SiO 2 A predominantly glass phase composition, whereby CaO-Al 2 O 3 -SiO 2 Firing the glass by the mixture at a high temperature; can effectively improve the hardness of the aggregate.
By adopting the design, the compounds forming glassy substances in the waste incineration fly ash are utilized, and active raw materials (namely micro silicon powder and Na) with different proportions are added 2 CO 3 Kaolin and spodumene) to achieve the optimum composition of the glass material. The addition of the active raw materials can also reduce the melting temperature of the mixture to achieve the aim of low-temperature meltingAnd the energy consumption and the carbon emission of the system are reduced.
In some embodiments, the raw materials of the aggregate comprise, in mass percent: 45-55% of waste incineration fly ash, 35-40% of micro silicon powder and Na 2 CO 3 8 to 9 percent of powder, 2.3 to 2.7 percent of spodumene and 7 to 8 percent of kaolin.
The typical waste incineration fly ash (dry basis) comprises the following chemical components in percentage by mass: 20 to 35 percent of CaO and SiO 2 :11％-19％、 Al 2 O 3 :1％-7％、Na 2 O:4％-6％、K 2 O:4％-6％、Fe 2 O 3 :3％-4％、MgO:2％-4％、Cl:10％-25％、SO 3 10 to 25 percent, wherein the total content of heavy metals such As Cd, Cr, Pb, Cu, Zn, Ni, Hg, As and the like is within the range of 11 to 20g/kg, and the total content is less than 1 percent.
In some embodiments, the aggregate comprises coarse aggregate having a particle size of 4.75mm-9.5mm and fine aggregate having a particle size < 4.75 mm.
According to another exemplary embodiment of the present invention, there is provided a method of preparing the highway asphalt pavement aggregate as described above, including:
s1, mixing the raw materials to obtain a mixture;
in some embodiments, the raw materials are mixed to obtain a mixture, specifically comprising:
(1) carrying out component ratio analysis on incoming materials of the waste incineration fly ash;
(2) weighing the raw materials according to the mixture ratio;
(3) the raw materials are uniformly mixed, ground and sieved by a sieve with 70 to 90 meshes.
S2, melting the mixture to obtain molten liquid;
specifically, the sieved material was melted in a glass melting furnace to obtain a melt. The glass kiln can adopt a tank kiln or a crucible kiln, the adopted energy can be coal gas, natural gas, heavy oil or coal, electric power and the like, and an intermittent or continuous operation mode can be adopted. The temperature rise rate of the glass kiln is 5-10 ℃/min.
In some embodiments, the melting temperature of the raw material mixture is 750-1500 ℃, and the melting time is kept for 30-120 min.
In actual operation, the high-temperature flue gas generated in the melting process can preheat the mixture through the heat exchanger so as to achieve the purpose of waste heat recycling. The compound flue gas containing Cl, Cd, Cr, Pb, Cu, Zn, Ni, Hg, As and other elements in the high-temperature flue gas generated in the melting process can be collected by a bag-type dust collector, an electric dust collector or an electric bag composite dust collector.
S3, carrying out water quenching and rapid cooling on the molten liquid to obtain a glass body; in actual operation, the cooling water for quenching can be waste water and/or sewage, such as garbage leachate of a garbage incineration power plant, reverse osmosis concentrated water of boiler make-up water, regenerated waste water of an ion exchange system, desulfurization waste liquid and the like, so that the effect of reducing the waste water and the sewage is achieved. The water quenching and quenching mode can adopt a spraying process, and the spraying can adopt a single-fluid spraying mode and a double-fluid spraying mode.
And S4, crushing the glass body to obtain an aggregate.
Specifically, the glass produced is crushed to obtain glass particles. And then screening by using a screen mesh with 1-5 meshes to prepare the highway asphalt pavement aggregate.
By adopting the method, the elements such as heavy metals in the waste incineration fly ash are discharged into high-temperature flue gas in the form of compound flue gas by utilizing the melting temperature, and most of the elements can be removed. Meanwhile, the residual elements such as heavy metal and the like are fixed in the glass body through the glass curing effect, so that the leaching value of the heavy metal and the like in the highway asphalt pavement aggregate is far superior to the national standard.
The waste incineration fly ash solidified by the glass is ground, the particle diameter of the waste incineration fly ash is smaller, the waste incineration fly ash is used as an aggregate to improve the interface structure between the aggregate and the asphalt in the asphalt pavement, the national standard requirement is met, various physical characteristics of the asphalt pavement can be obviously enhanced, and meanwhile, the waste incineration fly ash meets the requirement of environmental protection.
The aggregate can replace other aggregates used in the asphalt pavement according to the proportion of 10 to 50 percent.
The highway asphalt pavement aggregate and the preparation method thereof according to the present application will be described in detail below with reference to examples, comparative examples and experimental data.
Example 1
A preparation method of a highway asphalt pavement aggregate comprises the following steps:
the mass ratio of the raw materials is as follows: 48% of waste incineration fly ash, 42% of micro silicon powder and Na 2 CO 3 8 percent of spodumene and 2 percent of spodumene are ground and mixed evenly and then are sieved by a 90-mesh sieve. The mixture is melted in a glass kiln for 60min at the temperature of 800 ℃, and the temperature rise rate of the glass kiln is 5 ℃/min.
And (3) carrying out quenching and water quenching on the glass melt by spraying and contacting the glass melt with reverse osmosis concentrated water of a boiler water supply system of the waste incineration power plant, and then obtaining a glass body.
Pouring the glass body into a jaw crusher for crushing, then grinding the crushed material in a ball mill, and then sieving through a 4-mesh sieve to obtain a sieve material, thereby preparing the highway asphalt pavement fine aggregate. The obtained screen residue is screened out by a screen with 1 mesh to obtain the road asphalt pavement coarse aggregate.
Example 2
A preparation method of the highway asphalt pavement aggregate comprises the following steps:
the mass ratio of the raw materials is as follows: 48 percent of waste incineration fly ash, 42 percent of micro silicon powder and 6 percent of kaolin, and the materials are ground and mixed uniformly and then pass through a 90-mesh screen. The mixture is melted for 90min at 1400 ℃ in a glass kiln, and the temperature rise rate of the glass kiln is 5 ℃/min.
And (3) carrying out quenching and water quenching on the glass melt by spraying and contacting the glass melt with reverse osmosis concentrated water of a boiler water supply system of the waste incineration power plant, and then obtaining a glass body.
Pouring the glass body into a jaw crusher for crushing, then grinding the crushed material in a ball mill, and then sieving through a 4-mesh sieve to obtain a sieve material, thereby preparing the highway asphalt pavement fine aggregate. The obtained screen residue is screened out by a screen with 1 mesh to obtain the road asphalt pavement coarse aggregate.
Comparative example 1
A preparation method of a highway asphalt pavement aggregate comprises the following steps:
the mass ratio of the raw materials is as follows: 30% of waste incineration fly ash, 60% of silica fume and Na 2 CO 3 5 percent of spodumene, 4 percent of spodumene and 1 percent of kaolin, grinding and mixing uniformly, and sieving by a 90-mesh sieve. The mixture is melted in a glass kiln for 60min at the temperature of 800 ℃, and the temperature rise rate of the glass kiln is 5 ℃/min.
And obviously containing unmelted solid in the molten liquid, spraying and contacting the molten liquid with reverse osmosis concentrated water of a boiler water supply system of a waste incineration power plant, and performing quenching and water quenching to obtain a finished product glass body containing obviously unmelted solid.
Pouring the glass body into a jaw crusher for crushing, then grinding the crushed material in a ball mill, and then sieving through a 4-mesh sieve to obtain a sieve material, thereby preparing the fine aggregate for the highway asphalt pavement. The obtained screen residue is screened out by a screen with 1 mesh to obtain the road asphalt pavement coarse aggregate.
Comparative example 2
A preparation method of a highway asphalt pavement aggregate comprises the following steps:
the mass ratio of the raw materials is as follows: 65% of waste incineration fly ash, 15% of micro silicon powder and Na 2 CO 3 11 percent of spodumene, 1 percent of spodumene and 8 percent of kaolin, grinding and mixing uniformly, and sieving by a 90-mesh sieve. The mixture is melted in a glass kiln for 60min at the temperature of 800 ℃, and the temperature rise rate of the glass kiln is 5 ℃/min.
And (3) carrying out quenching and water quenching on the glass melt by spraying and contacting the glass melt with reverse osmosis concentrated water of a boiler water supply system of the waste incineration power plant, and then obtaining a glass body.
Pouring the glass body into a jaw crusher for crushing, then grinding the crushed material in a ball mill, and then sieving through a 4-mesh sieve to obtain a sieve material, thereby preparing the highway asphalt pavement fine aggregate. The obtained screen residue is screened out by a screen with 1 mesh to obtain the road asphalt pavement coarse aggregate.
The aggregates obtained in examples 1-2 and comparative examples 1-2 were examined, and the examination included Cl - Leaching detection and heavy metal ion detection, and the method is adoptedThe aggregate provided by the application examples all meet the use standard, and some of the aggregate provided by the comparative examples do not meet the use standard. Therefore, the aggregate prepared by the waste incineration fly ash provided by the application can be applied to asphalt, a new utilization way of the waste incineration fly ash is provided, the problem of accumulation of the waste incineration fly ash is solved, and resource utilization is realized.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) the method provided by the embodiment of the invention utilizes the melting temperature to discharge elements such as heavy metals in the waste incineration fly ash into high-temperature flue gas in the form of compound flue gas, so that most of the elements can be removed. Meanwhile, the residual elements such as heavy metals are fixed in the glass body through the glass curing effect, so that the leaching value of the heavy metals and the like in the highway asphalt pavement aggregate is far superior to the national standard;
(2) the waste incineration fly ash obtained by glass curing of the aggregate provided by the embodiment of the invention is ground, has smaller particle diameter, is used as the aggregate to improve the interface structure between the aggregate and the asphalt in the asphalt pavement, meets the national standard requirement, can obviously enhance various physical properties of the asphalt pavement, and simultaneously meets the environmental protection requirement;
(3) the aggregate provided by the embodiment of the invention can obviously reduce the amount of waste incineration fly ash and simultaneously meet the standard requirement of the aggregate of the asphalt pavement of the highway.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The highway asphalt pavement aggregate is characterized by comprising the following raw materials in percentage by mass:
40-60% of waste incineration fly ash,
30 to 45 percent of micro silicon powder and
Na 2 CO 3 7-10% of powder and/or 2-3% of spodumene.
2. The highway asphalt pavement aggregate according to claim 1, wherein the aggregate further comprises the following raw materials in percentage by mass: 5 to 10 percent of kaolin.
3. The highway asphalt pavement aggregate according to claim 2, wherein the aggregate comprises the following raw materials in percentage by mass: 45-55% of waste incineration fly ash, 35-40% of micro silicon powder and Na 2 CO 3 8 to 9 percent of powder, 2.3 to 2.7 percent of spodumene and 7 to 8 percent of kaolin.
4. The highway asphalt pavement aggregate according to any one of claims 1 to 3, wherein the chemical composition of said waste incineration fly ash comprises, in mass percent: 20 to 35 percent of CaO and SiO 2 :11％-19％、Al 2 O 3 :1％-7％、Na 2 O:4％-6％、K 2 O:4％-6％、Fe 2 O 3 :3％-4％、MgO:2％-4％、Cl:10％-25％、SO 3 :10％-25％。
5. A highway asphalt pavement aggregate according to claim 1 wherein the aggregate comprises coarse aggregate and fine aggregate, the coarse aggregate having a particle size of 4.75-9.5 mm and the fine aggregate having a particle size of < 4.75 mm.
6. A method of preparing a road asphalt pavement aggregate according to any one of claims 1 to 5, comprising:
mixing the raw materials to obtain a mixture;
melting the mixture to obtain molten liquid;
carrying out water quenching and rapid cooling on the molten liquid to obtain a glass body;
crushing the glass body to obtain aggregate;
wherein the raw materials comprise waste incineration fly ash, micro silicon powder and Na 2 CO 3 Powder, spodumene and kaolin.
7. The method for preparing the road asphalt pavement aggregate according to claim 6, wherein the mixture is sieved by a 70-90 mesh sieve.
8. The method for preparing the road asphalt pavement aggregate according to claim 6, wherein the melting temperature is 750-1500 ℃, and the melting holding time is 30-120 min; the heating rate of the melting is 5-10 ℃/min.
9. A method of preparing a road asphalt pavement aggregate according to claim 6, wherein the aggregate is sieved with a 1-5 mesh sieve.
10. The method for preparing the asphalt pavement aggregate for the highway according to claim 6, wherein the coolant quenched by water is wastewater and/or sewage.
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