CN116444203A - Steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, and preparation method and application thereof - Google Patents
Steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, and preparation method and application thereof Download PDFInfo
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- CN116444203A CN116444203A CN202310346155.XA CN202310346155A CN116444203A CN 116444203 A CN116444203 A CN 116444203A CN 202310346155 A CN202310346155 A CN 202310346155A CN 116444203 A CN116444203 A CN 116444203A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 126
- 239000002893 slag Substances 0.000 title claims abstract description 126
- 239000010959 steel Substances 0.000 title claims abstract description 126
- 239000000463 material Substances 0.000 title claims abstract description 80
- 238000001816 cooling Methods 0.000 title claims abstract description 56
- 238000009413 insulation Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims description 15
- 239000000835 fiber Substances 0.000 claims abstract description 79
- 239000010426 asphalt Substances 0.000 claims abstract description 66
- 235000019738 Limestone Nutrition 0.000 claims abstract description 55
- 239000006028 limestone Substances 0.000 claims abstract description 55
- 239000000919 ceramic Substances 0.000 claims abstract description 54
- 239000000203 mixture Substances 0.000 claims description 45
- 238000003756 stirring Methods 0.000 claims description 43
- 229920005610 lignin Polymers 0.000 claims description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 22
- 239000011707 mineral Substances 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 238000012423 maintenance Methods 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 239000006227 byproduct Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 231100000956 nontoxicity Toxicity 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 7
- 101100257136 Caenorhabditis elegans sma-5 gene Proteins 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 201000010099 disease Diseases 0.000 description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000011384 asphalt concrete Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 241000510097 Megalonaias nervosa Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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 provides a steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which uses byproduct steel slag in the steel production process as aggregate, and has better angularity and wear resistance so as to enhance the skid resistance of an asphalt pavement modified by the steel slag-based ultrathin wearing layer material; the added ceramic fiber has the advantages of low heat conductivity, high temperature resistance, no toxicity and the like; in addition, the traditional natural aggregate limestone is replaced by the steel slag which is a thermal resistance material with poor heat conduction capability, and the thermal parameters of the prepared steel slag-based ultrathin wearing layer material are changed, so that the heat conduction capability of the asphalt pavement is reduced, and the generation of rutting of the asphalt pavement is greatly slowed down; and the steel slag-based ultrathin wearing layer material can improve the water stability, the skid resistance and the thermal resistance of an asphalt road at the same time.
Description
Technical Field
The invention relates to the technical field of asphalt pavement maintenance materials, in particular to a steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, and a preparation method and application thereof.
Background
Asphalt pavement generally absorbs a large amount of heat in summer due to its extremely high heat absorbing capacity and accumulates in the pavement structure. The temperature in the asphalt pavement in the summer hot area can even reach more than 70 ℃, so that the fluidity of the asphalt mixture is increased, the viscosity is reduced, the shearing resistance is insufficient, and the diseases such as rutting, hugs, washboard and the like are caused. These diseases seriously affect the road performance, running safety and service life of asphalt pavement. In addition, heat stored in the pavement structure can cause continuous high temperature in cities, and the heat island effect is aggravated.
Although the technologies of heat reflection coating, energy collection pavement, thermal resistance wearing layer, porous asphalt concrete and the like in the prior art can reduce the temperature of asphalt pavement and reduce the occurrence of high-temperature diseases on pavement, the defects exist, such as poor wear resistance and skid resistance of the heat reflection coating, glare is easily caused to a driver, and the driving safety is reduced; the early investment of the energy collection pavement is large, the pavement paving process is complex and complicated, and the overall bearing capacity of the pavement can be reduced; the porous asphalt concrete has the advantages of larger void ratio, large contact area with air, water and the like, and poor water stability and aging resistance. Therefore, it is a need in the art to provide a thermal resistance wear layer for road maintenance or thin layer construction that can improve both the water stability, slip resistance and thermal resistance of asphalt roads.
Disclosure of Invention
The invention aims to provide a steel slag-based ultrathin wearing layer material for cooling and heat insulation of a pavement, and a preparation method and application thereof; the steel slag is used as a raw material, so that solid waste can be effectively consumed, the consumption of natural mineral aggregate resources and energy sources is reduced, the heat insulation and cooling functions of the steel slag-based ultrathin wearing layer material cannot be attenuated along with the time, and the steel slag-based ultrathin wearing layer material has the advantages of simplicity in maintenance and low material cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which is prepared from the following raw materials in parts by weight: 22-25 parts of limestone aggregate, 58-60 parts of steel slag, 0.1-0.14 part of ceramic fiber, 4-8 parts of asphalt, 0.2-0.4 part of lignin fiber and 9-12 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS modified asphalt.
Preferably, the grain size of the steel slag is 2.36-4.75 mm.
Preferably, the ceramic fiber is a blowing ceramic fiber; the classification temperature of the ceramic fiber is 1260 ℃.
Preferably, the average length of the ceramic fiber is 15-25 mm, and the thermal conductivity of the ceramic fiber is 0.15-0.19W/(m.K).
Preferably, the average length of the lignin fibers is 2.5-6 mm, and the ash content of the lignin fibers is 18-22 wt%.
The invention also provides a preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which comprises the following steps:
(1) Mixing and stirring the preheated limestone aggregate, preheated steel slag, ceramic fibers and lignin to obtain a first mixture;
(2) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment to obtain a second mixture;
(3) And (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
Preferably, the preheated steel slag in the step (1) is obtained by preheating for 4-6 hours at 160-168 ℃.
Preferably, the temperature of the first stirring treatment in the step (2) is 155-160 ℃, and the time of the first stirring treatment is 50-70 s.
Preferably, the temperature of the second stirring treatment in the step (3) is 155-160 ℃, and the time of the second stirring treatment is 50-70 s.
The invention also provides the application of the steel slag-based ultrathin wearing layer material prepared by the technical scheme or the steel slag-based ultrathin wearing layer material prepared by the preparation method in pavement maintenance.
The invention provides a steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which uses byproduct steel slag in the steel production process as aggregate, and has better angularity and wear resistance so as to enhance the skid resistance of an asphalt pavement modified by the steel slag-based ultrathin wearing layer material; in addition, the steel slag is used as a poor heat conduction body, has poor heat conduction capability and can be used as a heat resistance material, and the traditional natural aggregate limestone is replaced by the steel slag which is a heat resistance material with poor heat conduction capability, so that the thermal parameters of the prepared steel slag-based ultrathin wearing layer material are changed, and the heat conduction capability of the asphalt pavement is reduced, and the generation of rutting of the asphalt pavement is greatly slowed down; the added ceramic fiber has the advantages of low heat conductivity, high temperature resistance, no toxicity and the like; and the steel slag-based ultrathin wearing layer material can improve the water stability, the skid resistance and the thermal resistance of an asphalt road at the same time. The steel slag-based ultrathin wearing layer material provided by the invention not only can reuse steel slag solid waste, reduce environmental pollution and save natural stone resources, but also can provide excellent anti-skid performance, can be directly used in the maintenance work of the existing road, can slow down heat transfer to the interior of the road, and can reduce the generation of high-temperature diseases of asphalt road. In addition, the steel slag-based ultrathin wearing layer material prepared by the method is subjected to thermal physical property tests such as volume property, road performance, thermal constant, heat resistance and the like, and the road performance meets the requirements of the traffic department issued standard JTG F40-2004 on highway asphalt pavement construction technical specifications. The results of the examples show that all performance indexes of the steel slag-based ultrathin wearing layer materials for pavement cooling and heat insulation prepared in the examples 1-5 of the invention meet the technical standard requirements specified in JTG F40-2004 Highway asphalt pavement construction technical Specification; when the content of the ceramic fiber is 2% of the asphalt, the heat conductivity coefficient and the heat diffusion coefficient of the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement reach the minimum values, and the steel slag-based ultrathin wearing layer material has optimal heat resistance.
Detailed Description
The invention provides a steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which is prepared from the following raw materials in parts by weight: 22-25 parts of limestone aggregate, 58-60 parts of steel slag, 0.1-0.14 part of ceramic fiber, 4-8 parts of asphalt, 0.2-0.4 part of lignin fiber and 9-12 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS modified asphalt.
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 22-25 parts of limestone aggregate, preferably 21-24 parts. In the invention, the limestone aggregate preferably comprises 8-8.2 parts of limestone aggregate with the particle size of 4.75-9.5 mm, 5.5-5.8 parts of limestone aggregate with the particle size of 1.18-2.36 mm, 3.5-3.7 parts of limestone aggregate with the particle size of 0.6-1.18 mm, 2.5-2.9 parts of limestone aggregate with the particle size of 0.3-0.6 mm, 0.3-0.5 part of limestone aggregate with the particle size of 0.15-0.3 mm, 0.3-0.5 part of limestone aggregate with the particle size of 0.075-0.15 mm and 2.2-2.5 parts of limestone aggregate with the particle size of 0-0.075 mm.
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 58-60 parts of steel slag, preferably 58.5-59.5 parts of steel slag by weight. The invention controls the consumption of steel slag in the above range to meet the structural design requirement of the SMA-5 asphalt mixture and realize better heat insulation effect as much as possible. In the present invention, the grain size of the steel slag is preferably 2.36 to 4.75mm.
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 0.1-0.14 part of ceramic fiber, preferably 0.11-0.13 part of ceramic fiber in parts by weight. The invention controls the usage amount of the ceramic fiber in the above range to achieve the best road use and heat insulation performance. In the present invention, the ceramic fiber is preferably a blown ceramic fiber; the classification temperature of the ceramic fibers is preferably 1260 ℃. In the present invention, the average length of the ceramic fibers is preferably 15 to 25mm, more preferably 20mm. The invention controls the average length of the ceramic fiber in the range so as to achieve the aim of more stable fiber structure. In the present invention, the thermal conductivity of the ceramic fiber is preferably 0.15 to 0.19W/(m·k), more preferably 0.175W/(m·k). The invention controls the heat conductivity coefficient of the ceramic fiber in the above range to realize the maximization of the heat insulation performance.
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 4-8 parts of asphalt, preferably 5-7 parts of asphalt. In the present invention, the asphalt is SBS modified asphalt, more preferably SBS (I-D) modified asphalt. The invention controls the asphalt dosage in the above range to ensure the volume performance of the SMA-5 asphalt mixture
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 0.2-0.4 part of lignin fiber, preferably 0.25-0.35 part of lignin fiber. The invention controls the dosage of lignin fiber in the above range so as to meet the national standard requirement. In the present invention, the average length of the lignin fibers is preferably 2.5 to 6mm, more preferably 3.0 to 5.5mm. The invention controls the average length of lignin fiber in the above range to meet the national standard requirement. In the present invention, the ash content of the lignin fiber is preferably 18 to 22wt%, more preferably 20.6wt%.
The raw materials for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprise 9-12 parts of limestone mineral powder, preferably 9.5-11 parts. The invention controls the dosage of limestone mineral powder in the range so as to meet the grading design requirement.
The invention also provides a preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation, which comprises the following steps:
(1) Mixing and stirring the preheated limestone aggregate, preheated steel slag, ceramic fibers and lignin to obtain a first mixture;
(2) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment to obtain a second mixture;
(3) And (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
The method comprises the steps of mixing and stirring preheated limestone aggregate, preheated steel slag, ceramic fibers and lignin to obtain a first mixture.
In the present invention, the preheated limestone aggregate is preferably obtained by preheating at 160 to 168 ℃ for 4 to 6 hours.
In the invention, the preheated steel slag is preferably obtained by preheating for 4-6 hours at 160-168 ℃.
In the present invention, the ceramic fiber is preferably torn into small portions prior to use. In the present invention, the mixing time is preferably 50 to 70 seconds, more preferably 60 seconds. The invention controls the mixing time in the above range to more precisely control the mixing process.
After the first mixture is obtained, asphalt is added into the first mixture, and then the first stirring treatment is carried out to obtain a second mixture.
In the present invention, the temperature of the first stirring treatment is preferably 155 to 160 ℃; the time of the first stirring treatment is preferably 50 to 70 seconds, more preferably 60 seconds. The invention controls the temperature and time of the first stirring treatment in the above range to more precisely control the stirring process.
After a second mixture is obtained, limestone mineral powder is added into the second mixture, and then second stirring treatment is carried out, so that the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is obtained.
In the present invention, the temperature of the second stirring treatment is preferably 155 to 160 ℃; the time of the second stirring treatment is preferably 50 to 70 seconds, more preferably 60s. The invention controls the temperature and time of the second stirring treatment in the above range to more precisely control the stirring process.
The invention also provides the application of the steel slag-based ultrathin wearing layer material prepared by the technical scheme or the steel slag-based ultrathin wearing layer material prepared by the preparation method in pavement maintenance.
In the invention, the method for applying the steel slag-based ultrathin wearing layer material to pavement maintenance comprises the following steps of: placing the prepared steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement on the surface of a matrix, and paving and rolling the steel slag-based ultrathin wearing layer material.
In the present invention, the substrate surface is preferably a road surface or a building surface to be improved in cooling and heat insulating properties.
The method of paving and rolling is not particularly limited, and the paving and rolling technical scheme well known in the art can be adopted.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation provided by the invention is simple to operate, mild in reaction condition and suitable for a construction site.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
0-2.36mm limestone aggregate and 2.36-4.75mm steel slag are screened to form single-grade aggregate, the mixing amount of limestone mineral powder is 12% of the mass of the mineral aggregate, and the SMA-5 grading is determined. The optimal whetstone ratio of the conventional SMA-5 blend was determined to be 6.6% using SBS (I-D) modified asphalt and incorporating ceramic fibers and lignin fibers for blend design, and the SMA-5 grading ranges of examples 1-5 are shown in Table 1.
TABLE 1 SMA-5 grading
Example 1
The steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is prepared from the following raw materials in parts by weight: 27.1 parts of limestone aggregate, 54.97 parts of steel slag, 0.1 part of ceramic fiber, 6.23 parts of asphalt, 0.3 part of lignin fiber and 11.3 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS (I-D) modified asphalt; the method comprises the steps of carrying out a first treatment on the surface of the The average length of the lignin fiber is 3.0-5.5 mm, and the ash content is 20.6wt%.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprises the following steps:
(1) Mixing the preheated limestone aggregate, the preheated steel slag, the ceramic fibers torn into small parts and lignin, and stirring for 60 seconds to obtain a first mixture;
the preheated steel slag and the preheated limestone aggregate are respectively obtained by preheating for 5 hours at 165 ℃;
(2) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment for 60s to obtain a second mixture;
(3) And (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment for 60s to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
Example 2
The steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is prepared from the following raw materials in parts by weight: 26.36 parts of limestone aggregate, 56.22 parts of steel slag, 0.1 part of ceramic fiber, 6.36 parts of asphalt, 0.3 part of lignin fiber and 10.66 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS (I-D) modified asphalt; the ceramic fiber is a blowing ceramic fiber, the classification temperature is 1260 ℃, the average length is 20mm, and the heat conductivity coefficient is 0.175W/(m.K); the average length of the lignin fiber is 3.0-5.5 mm, and the ash content is 20.6wt%.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprises the following steps:
(4) Mixing the preheated limestone aggregate, the preheated steel slag, the ceramic fibers torn into small parts and lignin, and stirring for 60 seconds to obtain a first mixture;
the preheated steel slag and the preheated limestone aggregate are respectively obtained by preheating for 5 hours at 165 ℃;
(5) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment for 60s to obtain a second mixture;
and (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment for 60s to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
Example 3
The steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is prepared from the following raw materials in parts by weight: 23.48 parts of limestone aggregate, 59.10 parts of steel slag, 0.12 part of ceramic fiber, 6.17 parts of asphalt, 0.3 part of lignin fiber and 10.83 parts of limestone mineral powder;
the steel slag the grain diameter is 2-5 mm; the asphalt is SBS (I-D) modified asphalt; the ceramic fiber is a blowing ceramic fiber, the classification temperature is 1260 ℃, the average length is 20mm, and the heat conductivity coefficient is 0.175W/(m.K); the average length of the lignin fiber is 3.0-5.5 mm, and the ash content is 20.6wt%.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprises the following steps:
(6) Mixing the preheated limestone aggregate, the preheated steel slag, the ceramic fibers torn into small parts and lignin, and stirring for 60 seconds to obtain a first mixture;
the preheated steel slag and the preheated limestone aggregate are respectively obtained by preheating for 5 hours at 165 ℃;
(7) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment for 60s to obtain a second mixture;
and (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment for 60s to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
Example 4
The steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is prepared from the following raw materials in parts by weight: 28.49 parts of limestone aggregate, 54.53 parts of steel slag, 0.11 part of ceramic fiber, 6.39 parts of asphalt, 0.3 part of lignin fiber and 10.18 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS (I-D) modified asphalt; the ceramic fiber is a blowing ceramic fiber, the classification temperature is 1260 ℃, the average length is 20mm, and the heat conductivity coefficient is 0.175W/(m.K); the average length of the lignin fiber is 3.0-5.5 mm, and the ash content is 20.6wt%.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprises the following steps:
(8) Mixing the preheated limestone aggregate, the preheated steel slag, the ceramic fibers torn into small parts and lignin, and stirring for 60 seconds to obtain a first mixture;
the preheated steel slag and the preheated limestone aggregate are respectively obtained by preheating for 5 hours at 165 ℃;
(9) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment for 60s to obtain a second mixture;
and (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment for 60s to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
Example 5
The steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement is prepared from the following raw materials in parts by weight: 23.92 parts of limestone aggregate, 58.67 parts of steel slag, 0.13 part of ceramic fiber, 6.41 parts of asphalt, 0.3 part of lignin fiber and 10.57 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS (I-D) modified asphalt; the ceramic fiber is a blowing ceramic fiber, the classification temperature is 1260 ℃, the average length is 20mm, and the heat conductivity coefficient is 0.175W/(m.K); the average length of the lignin fiber is 3.0-5.5 mm, and the ash content is 20.6wt%.
The preparation method of the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation comprises the following steps:
(10) Mixing the preheated limestone aggregate, the preheated steel slag, the ceramic fibers torn into small parts and lignin, and stirring for 60 seconds to obtain a first mixture;
the preheated steel slag and the preheated limestone aggregate are respectively obtained by preheating for 5 hours at 165 ℃;
(11) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment for 60s to obtain a second mixture;
and (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment for 60s to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
The steel slag-based ultrathin wearing layer materials for pavement cooling and heat insulation prepared in examples 1 to 5 were manufactured into double-layer rutting plates and marshall test pieces, the pavement performance and the heat resistance of the steel slag-based ultrathin wearing layer materials for pavement cooling and heat insulation prepared in examples 1 to 5 were respectively detected by an outdoor cooling experiment method and an indoor cooling experiment, the temperatures of the upper surface and the lower surface of the double-layer rutting plate test pieces were respectively tested by an infrared thermal imager, and the heat conductivity, the heat diffusion coefficient and the specific heat capacity of 5 different steel slag-based ultrathin wearing layer materials for pavement cooling and heat insulation were tested by a thermal constant analyzer (Hot Disk), and the specific results are shown in tables 2 and 3 below.
Table 2 road performance of slag-based ultra-thin wearing layer materials for road surface cooling and heat insulation prepared in examples 1 to 5
Table 3 heat resistance properties of slag-based ultra-thin wearing layer materials for road surface cooling and heat insulation prepared in examples 1 to 5
As can be seen from table 2 and table 3, each performance index of the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement prepared in examples 1 to 5 meets the technical standard requirements specified in the technical Specification of JTG F40-2004 road asphalt pavement construction; when the ceramic fiber content is 2% of the asphalt consumption, the heat conductivity coefficient and the heat diffusion coefficient of the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement reach the minimum values, and the steel slag-based ultrathin wearing layer material has optimal heat resistance; the steel slag and the ceramic fiber can obviously reduce the heat conductivity coefficient and the heat diffusion coefficient of the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement, and meanwhile, the steel slag can increase the specific heat capacity of the mixture; when the ceramic fiber is 2% of the asphalt and is mixed with the steel slag, the prepared steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement has the best cooling effect.
In summary, the invention can reduce the heat absorbed by the prepared steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement by adding the steel slag and controlling the content of the ceramic fiber, is beneficial to reducing the permanent deformation of the asphalt mixture, can greatly slow down the generation of rutting of the asphalt pavement, and has great significance for reducing the urban heat island effect.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation is prepared from the following raw materials in parts by weight: 22-25 parts of limestone aggregate, 58-60 parts of steel slag, 0.1-0.14 part of ceramic fiber, 4-8 parts of asphalt, 0.2-0.4 part of lignin fiber and 9-12 parts of limestone mineral powder;
the grain diameter of the steel slag is 2-5 mm; the asphalt is SBS modified asphalt.
2. The steel slag-based ultra-thin wearing layer material according to claim 1, wherein the grain size of the steel slag is 2.36-4.75 mm.
3. The steel slag-based ultra-thin wearing layer material according to claim 1, wherein the ceramic fiber is a blowing type ceramic fiber; the classification temperature of the ceramic fiber is 1260 ℃.
4. A steel slag-based ultra-thin wearing layer material according to claim 1 or 3, wherein the average length of the ceramic fiber is 15-25 mm, and the thermal conductivity of the ceramic fiber is 0.15-0.19W/(m-K).
5. The steel slag based ultra-thin wearing layer material according to claim 1, wherein the average length of the lignin fiber is 2.5-6 mm, and the ash content of the lignin fiber is 18-22 wt%.
6. The method for preparing the steel slag-based ultrathin wearing layer material for pavement cooling and heat insulation according to claims 1-5, which comprises the following steps:
(1) Mixing and stirring the preheated limestone aggregate, preheated steel slag, ceramic fibers and lignin to obtain a first mixture;
(2) Adding asphalt into the first mixture obtained in the step (1), and then performing first stirring treatment to obtain a second mixture;
(3) And (3) adding limestone mineral powder into the second mixture obtained in the step (2), and then carrying out second stirring treatment to obtain the steel slag-based ultrathin wearing layer material for cooling and heat insulation of the pavement.
7. The method according to claim 6, wherein the preheated steel slag in the step (1) is obtained by preheating at 160 to 168 ℃ for 4 to 6 hours.
8. The method according to claim 6, wherein the temperature of the first stirring treatment in the step (2) is 155 to 160 ℃, and the time of the first stirring treatment is 50 to 70 seconds.
9. The method according to claim 6, wherein the temperature of the second stirring treatment in the step (3) is 155 to 160 ℃, and the time of the second stirring treatment is 50 to 70 seconds.
10. The use of the steel slag-based ultrathin wearing layer material according to any one of claims 1 to 5 or the steel slag-based ultrathin wearing layer material prepared by the preparation method according to any one of claims 6 to 9 in pavement maintenance.
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