CN107892509B - Water-retention thermal resistance type asphalt pavement structure - Google Patents
Water-retention thermal resistance type asphalt pavement structure Download PDFInfo
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- CN107892509B CN107892509B CN201711187875.7A CN201711187875A CN107892509B CN 107892509 B CN107892509 B CN 107892509B CN 201711187875 A CN201711187875 A CN 201711187875A CN 107892509 B CN107892509 B CN 107892509B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
A water-retention thermal resistance type asphalt pavement structure belongs to the technical field of road engineering. The pavement structure is formed by compounding a porous thermal resistance type asphalt mixture matrix and a water-retaining material filled in gaps of the porous thermal resistance type asphalt mixture matrix; the porous thermal resistance type asphalt mixture matrix is a porous asphalt mixture with the porosity of 20-32% and is prepared by mixing aggregates with low thermal conductivity coefficient; the water-retaining material is prepared by mixing 40-55 parts by mass of blast furnace slag powder, 3-5 parts by mass of fly ash, 6-10 parts by mass of slaked lime and 37-45 parts by mass of water. Thermal resistance material and water retention formula material are adopted in the complex, have thermal-insulated and the advantage that the water absorption is protected to guarantor concurrently, compare with the cooling road surface of traditional single function and have better cooling effect to have more lasting cooling ability under the high temperature environment that lasts, can effectively reduce road pavement temperature, alleviate urban heat island effect.
Description
Technical Field
The invention belongs to the technical field of road engineering, relates to an asphalt pavement structure, and particularly relates to a water-retaining thermal resistance type asphalt pavement structure.
Background
At present, asphalt pavement has become the first choice of road pavement due to the advantages of high flatness, good driving comfort, convenient maintenance and the like. According to statistics, asphalt pavements are adopted on more than 80% of road pavements and more than 90% of expressway pavements in China. Due to the thermal inductance characteristic of the asphalt concrete, the temperature of the asphalt concrete is raised faster than the ambient temperature when the asphalt concrete is irradiated by the sun, and the surface temperature of the asphalt pavement can reach more than 60 ℃ in hot areas in summer. In recent years, due to global climate change and rapid development of urbanization, the heat island effect phenomenon is increasingly serious, and road surface temperature is increased, so that road surface diseases such as rutting and the like are caused, and the comfort level of urban living is influenced. Therefore, certain measures are necessary to reduce the temperature of the road surface and relieve the urban heat island effect.
In recent years, through the research efforts of road researchers, some new cooling type road surfaces have been developed, such as: heat-shielding type pavements, water-retaining type pavements and heat resistance type pavements have certain pavement cooling effects, but only adopt a single technical function, so that the cooling capacity is limited. How to further improve the cooling capacity of the asphalt pavement is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a water-retention heat-resistance type asphalt pavement structure which has the performances of heat insulation, water absorption and water retention, can effectively reduce the pavement temperature and relieve the urban heat island effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a water retention and thermal resistance type asphalt pavement structure is composed of a porous thermal resistance type asphalt mixture matrix and a water retention material filled in gaps of the porous thermal resistance type asphalt mixture matrix;
the porous thermal resistance type asphalt mixture matrix is a porous asphalt mixture with the porosity of 20-32% and is prepared by mixing aggregates with low thermal conductivity coefficient; the water-retaining material is prepared by mixing 40-55 parts by mass of blast furnace slag powder, 3-5 parts by mass of fly ash, 6-10 parts by mass of slaked lime and 37-45 parts by mass of water (the composition ratio of the porous thermal resistance type asphalt mixture matrix and the water-retaining material can be limited by the porosity of 20-32%).
Further:
the porous thermal resistance type asphalt mixture matrix is formed by adding mineral powder, fine aggregates (the fine aggregates are specifically explained and specified in JTG F40-2004) and coarse aggregates (the fine aggregates are specifically explained and specified in JTG F40-2004) into high-viscosity modified asphalt (the high-viscosity modified asphalt is specifically defined in CJJ/T190-2012: namely modified asphalt with the dynamic viscosity value at 60 ℃ of not less than 20000 Pa-s) or epoxy asphalt; according to the weight portion: 4.5-5.5 parts of high-viscosity modified asphalt or epoxy asphalt; 2-8 parts of mineral powder; 10-20 parts of fine aggregate; 75-88 parts of coarse aggregate. The fine aggregate is preferably machine-made sand with hard texture; the coarse aggregate is preferably an aggregate with the grain size of more than 4.75mm, and consists of low-thermal-conductivity-coefficient aggregate and common aggregate, wherein the low-thermal-conductivity-coefficient aggregate accounts for 20-80% of the total volume of the coarse aggregate, and the low-thermal-conductivity-coefficient aggregate can be at least one of calcined bauxite and ceramsite.
The fluidity of the water-retaining material is 9-14 s, and the water absorption rate is more than 35%.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a composite structure of the combination of the asphalt mixture matrix with low thermal resistance and the water-retaining material. The porous thermal resistance type asphalt mixture matrix is prepared by mixing aggregates with low thermal conductivity coefficients instead of common aggregates. The asphalt mixture matrix adopts calcined bauxite and ceramsite with low thermal conductivity coefficient to replace common coarse aggregate, so that the thermal resistance of the pavement can be effectively reduced, the heat absorption capacity of the pavement is reduced, the conduction of heat absorbed by the surface of the pavement to the lower layer of the pavement is reduced, and a good heat insulation function is achieved. Meanwhile, the addition of the low-thermal conductivity aggregate and the design of the open-graded macroporosity can cause the reduction of road performance such as low-temperature crack resistance, water stability and the like, so the invention adopts the high-viscosity modified asphalt or the epoxy asphalt to enhance the adhesion performance between the asphalt and the aggregate, and the road performance of the asphalt meets the relevant requirements.
The water-retaining material is a milk slurry prepared by mixing and stirring blast furnace slag powder, fly ash, slaked lime and water, has good fluidity, can be uniformly poured into a porous thermal resistance type asphalt mixture matrix before hardening, and effectively fills communicated pores of the asphalt mixture. The water-retaining material after hardening has a water absorption rate of more than 35%, has good water absorption and retention properties, can absorb water and store the water in a road surface in rainy days or artificial sprinkling, and when the environmental temperature is higher, the stored water reduces the temperature of the road surface through continuous evaporation. Meanwhile, the addition of the water-retaining material enables the matrix structure to be changed from a framework-pore structure into a framework-dense structure, and the structural strength of the pavement is improved.
The heat-resistant material and the water-retaining material are combined, so that the heat-resistant water-retaining water-absorbing heat-insulating road surface has the advantages of heat insulation and water retention, has a better cooling effect compared with the traditional cooling road surface with a single function, has a more lasting cooling capacity in a continuous high-temperature environment, can effectively reduce the temperature of the road surface, and relieves the urban heat island effect.
Drawings
FIG. 1 is a schematic structural diagram of a water-retaining thermal resistance type asphalt pavement; the notation in fig. 1 indicates: 1-porous thermal resistance type asphalt mixture matrix; 2-water-retentive material.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Referring to fig. 1, a water retention and thermal resistance type asphalt pavement comprises a porous thermal resistance type asphalt mixture matrix 1 and a water retention material 2 filled in pores of the porous thermal resistance type asphalt mixture matrix.
The porous thermal resistance type asphalt mixture matrix 1 is prepared by mixing and stirring 5.2 parts of epoxy asphalt, 4 parts of mineral powder, 11 parts of fine aggregate and 85 parts of coarse aggregate, wherein the coarse aggregate consists of 40% of calcined bauxite and 60% of common aggregate, and the porosity of the porous thermal resistance type asphalt mixture matrix after paving is 24%.
Preparation of water-retentive material 2: firstly, adding 46 parts of blast furnace slag powder, 5 parts of fly ash and 7 parts of slaked lime in parts by mass into a stirrer, uniformly stirring, adding 42 parts of water, and continuously stirring until the mixture is completely mixed. The fluidity of the mixed water-retaining material is 11, the compressive strength after curing and hardening for 7 days is 2.83MPa, and the water absorption is 39 percent.
During construction, after the porous thermal resistance type asphalt mixture matrix is paved, the water-retaining material is poured into the porous thermal resistance type asphalt mixture matrix after the surface temperature is reduced to be below 50 ℃. The pouring construction can adopt manual work or a special spraying vehicle, and the flat vibrator is used for assisting the vibration, so that the water-retaining material is fully filled in the pores. And after the construction is finished, moisturizing and maintaining for a period of time to obtain the water-retention heat-resistance type asphalt pavement.
Example 2
Similar to example 1, except that:
the porous thermal resistance type asphalt mixture matrix 1 is prepared by mixing and stirring 4.5 parts of epoxy asphalt, 2 parts of mineral powder, 10 parts of fine aggregate and 88 parts of coarse aggregate, wherein the coarse aggregate consists of 20% of ceramsite and 80% of common aggregate, and the porosity of the porous thermal resistance type asphalt mixture matrix after paving is finished is 32%.
Preparation of water-retentive material 2: firstly, 55 parts of blast furnace slag powder, 3 parts of fly ash and 6 parts of slaked lime are added into a stirrer by mass and are uniformly stirred, and then 37 parts of water is added and is continuously stirred until the mixture is completely mixed. The fluidity of the mixed water-retaining material is 14, the compressive strength after curing and hardening for 7 days is 3.35MPa, and the water absorption is 35 percent.
Example 3
Similar to example 1, except that:
the porous thermal resistance type asphalt mixture matrix 1 is prepared by mixing and stirring 5.5 parts of high-viscosity modified asphalt, 5 parts of mineral powder, 20 parts of fine aggregate and 75 parts of coarse aggregate, wherein the coarse aggregate consists of 60% of calcined bauxite and 40% of common aggregate, and the porosity of the porous thermal resistance type asphalt mixture matrix after paving is 20%.
Preparation of water-retentive material 2: firstly, 40 parts of blast furnace slag powder, 5 parts of fly ash and 10 parts of slaked lime are added into a stirrer by mass and are uniformly stirred, and then 45 parts of water is added and is continuously stirred until the mixture is completely mixed. The fluidity of the mixed water-retaining material is 9, the compressive strength after curing and hardening for 7 days is 2.61MPa, and the water absorption is 42%.
Example 4
Similar to example 1, except that:
the porous thermal resistance type asphalt mixture matrix 1 is prepared by mixing and stirring 5 parts of high-viscosity modified asphalt, 8 parts of mineral powder, 12 parts of fine aggregate and 80 parts of coarse aggregate, wherein the coarse aggregate consists of 80% of ceramsite and 20% of common aggregate, and the porosity of the porous thermal resistance type asphalt mixture matrix after paving is 22%.
Preparation of water-retentive material 2: firstly, 45 parts of blast furnace slag powder, 4 parts of fly ash and 8 parts of slaked lime are added into a stirrer by mass and are uniformly mixed, and then 43 parts of water is added and is continuously stirred until the mixture is completely mixed. The fluidity of the mixed water-retaining material is 10, the compressive strength after curing and hardening for 7 days is 2.75MPa, and the water absorption is 40 percent.
Table 1 is given below, and table 1 is a test result of the temperature lowering performance of the above examples with a general asphalt mixture and a general water retention type road surface. In the test, the heating lamp is adopted to simulate the heating of the sunlight radiation to the road surface, and the cooling performance of the road surface is observed by continuously measuring the surface temperature of the sprayed road surface test piece. As can be seen from Table 1, the embodiments of the present invention have a stronger cooling capacity and a longer cooling time than the conventional dense graded asphalt pavement and the conventional water-retaining pavement.
TABLE 1
The results of the cooling performance test are shown in Table 1.
Claims (2)
1. A water retention and thermal resistance type asphalt pavement structure is characterized in that the pavement structure is formed by compounding a porous thermal resistance type asphalt mixture matrix and a water retention material filled in gaps of the porous thermal resistance type asphalt mixture matrix;
the porous thermal resistance type asphalt mixture matrix is a porous asphalt mixture with the porosity of 20-32% and is prepared by mixing aggregates with low thermal conductivity coefficient; the water-retaining material is prepared by mixing 40-55 parts by mass of blast furnace slag powder, 3-5 parts by mass of fly ash, 6-10 parts by mass of slaked lime and 37-45 parts by mass of water;
the porous thermal resistance type asphalt mixture matrix is formed by adding mineral powder, fine aggregates and coarse aggregates into high-viscosity modified asphalt or epoxy asphalt; according to the weight portion: 4.5-5.5 parts of high-viscosity modified asphalt or epoxy asphalt, 2-8 parts of mineral powder, 10-20 parts of fine aggregate and 75-88 parts of coarse aggregate; the fine aggregate is machine-made sand with hard texture; the coarse aggregate is an aggregate with the particle size larger than 4.75mm and consists of low-thermal-conductivity-coefficient aggregate and common aggregate, wherein the low-thermal-conductivity-coefficient aggregate accounts for 20-80% of the total volume of the coarse aggregate; the low-thermal-conductivity aggregate is at least one of calcined bauxite and ceramsite.
2. The water-retention heat-resistance type asphalt pavement structure as claimed in claim 1, wherein the fluidity of the water-retention material is 9-14 s, and the water absorption rate is more than 35%.
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| CN201711187875.7A CN107892509B (en) | 2017-11-24 | 2017-11-24 | Water-retention thermal resistance type asphalt pavement structure |
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Citations (6)
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|---|---|---|---|---|
| CN101581066A (en) * | 2009-06-10 | 2009-11-18 | 重庆交通大学 | Water conservation temperature reduction half-flexible pavement and construction method thereof |
| CN102071029A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Green low-carbon curing agent for soil curing |
| CN102674753A (en) * | 2012-05-30 | 2012-09-19 | 长安大学 | Thermal resistance type ceramisite wearing layer for asphalt road and preparation method for thermal resistance type ceramisite wearing layer |
| WO2013162170A1 (en) * | 2012-04-26 | 2013-10-31 | 한국건설기술연구원 | Heat insulating asphalt concrete using waste plastic aggregate |
| CN105924038A (en) * | 2016-04-30 | 2016-09-07 | 山西省交通科学研究院 | Heat-blocked and exhaust-gas-degraded type asphalt pavement structure |
| CN107324837A (en) * | 2017-06-26 | 2017-11-07 | 佛山生态海绵城市科技发展有限公司 | A kind of permeable drainage paving slab brick of water conservation and preparation method thereof |
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2017
- 2017-11-24 CN CN201711187875.7A patent/CN107892509B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581066A (en) * | 2009-06-10 | 2009-11-18 | 重庆交通大学 | Water conservation temperature reduction half-flexible pavement and construction method thereof |
| CN102071029A (en) * | 2010-12-24 | 2011-05-25 | 东南大学 | Green low-carbon curing agent for soil curing |
| WO2013162170A1 (en) * | 2012-04-26 | 2013-10-31 | 한국건설기술연구원 | Heat insulating asphalt concrete using waste plastic aggregate |
| CN102674753A (en) * | 2012-05-30 | 2012-09-19 | 长安大学 | Thermal resistance type ceramisite wearing layer for asphalt road and preparation method for thermal resistance type ceramisite wearing layer |
| CN105924038A (en) * | 2016-04-30 | 2016-09-07 | 山西省交通科学研究院 | Heat-blocked and exhaust-gas-degraded type asphalt pavement structure |
| CN107324837A (en) * | 2017-06-26 | 2017-11-07 | 佛山生态海绵城市科技发展有限公司 | A kind of permeable drainage paving slab brick of water conservation and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| "石灰粉煤灰混合料强度形成机理及提高早期强度的措施";《交通标准化》;《交通标准化》;20051115(第11期);"1.2石灰的结晶作用和碳化作用"和"1.3 石灰与粉煤灰的火山灰反应" * |
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