CN115073926B - Construction method and application of asphalt concrete - Google Patents
Construction method and application of asphalt concrete Download PDFInfo
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- CN115073926B CN115073926B CN202210507558.3A CN202210507558A CN115073926B CN 115073926 B CN115073926 B CN 115073926B CN 202210507558 A CN202210507558 A CN 202210507558A CN 115073926 B CN115073926 B CN 115073926B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, 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
- 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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/011—Nanostructured additives
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention discloses a construction method of asphalt concrete and application thereof, wherein the construction method comprises the following steps: (1) aggregate preheating: heating and drying the aggregate to obtain hot aggregate; (2) asphalt heat treatment: heating, melting and dehydrating asphalt to obtain hot asphalt; adding a modifier into asphalt in the heating and melting process; (3) mixing treatment: and (3) dry-mixing the hot aggregate obtained in the step (1) with the filler, and then spraying the hot asphalt obtained in the step (2) for mixing to obtain the asphalt concrete. According to the invention, the modifier consisting of the acrylate rubber, the cyclodextrin, the nano silicon dioxide and the non-cured rubber asphalt waterproof coating is added, so that the mixing performance of asphalt concrete is improved, and meanwhile, the water stability and the impermeability of the asphalt concrete are improved, and the technical support is provided for construction of asphalt concrete core walls in high altitude environments (3000 m-4000 m).
Description
Technical Field
The invention belongs to the technical field of asphalt concrete, and particularly relates to a construction method and application of asphalt concrete.
Background
Asphalt concrete is commonly called asphalt concrete, and is prepared by manually selecting mineral aggregate, crushed stone or crushed gravel, stone scraps or sand, mineral powder and the like with certain proportion of road asphalt material and mixing the mineral aggregate, the crushed stone or crushed gravel, the stone scraps or sand, the mineral powder and the like under the strict control condition.
Along with the rapid development of hydraulic and hydroelectric engineering construction, the treatment range, depth and stratum structure are complicated and diversified. In the prior art, when constructing an asphalt concrete core wall dam, the construction is usually carried out according to the water conservancy and hydropower construction standard, and as specified in the standard: 1. the construction can be performed when the lowest air temperature is higher than 0 ℃, the wind power is lower than 4 levels, and the daily precipitation is lower than 5 mm; 2. in the process of paving the asphalt concrete, the surface temperature of the lower asphalt concrete layer paved in advance needs to be above 70 ℃ to continuously pave the upper asphalt concrete layer on the lower asphalt concrete layer; 3. the thickness of the single-layer asphalt concrete layer cannot be larger than 25cm; 4. after the asphalt concrete is paved, adopting a small vibration roller smaller than 1.5t to roller so as to ensure that the paved asphalt concrete is compacted; 5. when the asphalt concrete core wall dam is constructed, alkaline aggregate is adopted, and the oil-stone ratio is between 6.8 and 7.1 percent; 6. when filling the dam shell, stopping construction when the lowest air temperature is below minus 10 ℃.
According to the above specifications, asphalt concrete core walls cannot be constructed in high-altitude areas with the altitude of more than 3000m, the daily minimum air temperature of less than 0 ℃, the wind power of more than 4 levels and the daily precipitation of more than 5mm frequently occur.
However, due to the development of hydraulic and hydroelectric engineering construction, the construction needs to be frequently operated in high-altitude areas, the areas are highly cold and anoxic, the air is thin, the daily minimum air temperature is even less than-20 ℃, the annual wind power is more than 4 levels, and the areas have small rain and snow (daily precipitation is sometimes more than 10 mm), and in the areas, the physical and mechanical properties of the asphalt material and the asphalt concrete can be influenced by the altitude environmental factors.
Therefore, the asphalt concrete construction method which is suitable for local conditions and can ensure construction quality and safety is developed for high-altitude areas.
Disclosure of Invention
In order to solve the technical problems, the invention provides a construction method of asphalt concrete and application thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate: heating and drying the aggregate to obtain hot aggregate;
(2) And (3) heat treatment of asphalt: heating, melting and dehydrating asphalt to obtain hot asphalt;
(3) Mixing: and (3) dry-mixing the hot aggregate obtained in the step (1) with the filler, and then spraying the hot asphalt obtained in the step (2) for mixing to obtain the asphalt concrete.
Preferably, the temperature of the hot aggregate in step (1) is 170-190 ℃.
Preferably, the aggregate in the step (1) comprises coarse aggregate and fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
Preferably, in the step (2), the asphalt is heated and melted by taking heat conducting oil as a medium when being melted, so that the asphalt is prevented from aging.
Preferably, the modifier is added to the asphalt during the heating and melting process in step (2).
Further preferably, the modifier is added in an amount of 0.1 to 0.5% by mass of the asphalt.
Further preferably, the modifier comprises acrylate rubber, cyclodextrin, nano silica and non-cured rubber asphalt waterproof paint.
Further preferably, the mass ratio of the acrylate rubber to the cyclodextrin to the nano silicon dioxide to the non-cured rubber asphalt waterproof coating is 5-8:0.3-0.5:2-6:8-12.
Preferably, the temperature of the hot asphalt in the step (2) is 100-140 ℃, and the water content of the hot asphalt is lower than 2 per mill.
Preferably, the dry mixing in step (3) takes from 23 to 28 seconds.
Preferably, the filler in step (3) is limestone powder having a particle size of less than 0.075 mm.
Preferably, the mixing time in step (3) is 55-65s.
Preferably, the step (3) further comprises preheating the stirring device before the stirring treatment.
The invention also provides application of the construction method in high-altitude asphalt concrete core wall engineering.
The invention also provides an asphalt concrete core wall which is obtained by adopting the construction method.
The beneficial effects of the invention are as follows:
according to the construction method of the asphalt concrete, the mixing performance of the asphalt concrete is improved by adding the modifier consisting of the acrylate rubber, the cyclodextrin, the nano silicon dioxide and the non-cured rubber asphalt waterproof coating, and meanwhile, the water stability and the impermeability of the asphalt concrete are improved, so that technical support is provided for construction of asphalt concrete core walls in high-altitude environments (3000 m-4000 m).
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes embodiments of the present invention in conjunction with specific embodiments. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Before the embodiments of the invention are explained in further detail, it is to be understood that the invention is not limited in its scope to the particular embodiments described below; it is also to be understood that the terminology used in the examples of the invention is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the invention.
The invention does not limit the sources of the adopted raw materials, and if no special description exists, the adopted raw materials are common commercial products in the technical field, wherein the acrylic rubber and the CAS:67254-76-6; the nano silicon dioxide is fumed silica, 100% cohesive failure of the non-cured rubber asphalt waterproof paint is achieved, and 0.6Mpa water seepage is avoided.
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel oil internal combustion type drying and heating cylinder and heating for about 3-3.5min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises coarse aggregate and fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
In order to further improve the performance of asphalt, the main improvement points of the invention are as follows: adding a modifier into asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass of 5-8:0.3-0.5:2-6:8-12 of acrylate rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt waterproof paint; the addition amount of the modifier is 0.1-0.5% of the mass of the asphalt.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing materials, dry-mixing the hot aggregate obtained in the step (1) and filler (limestone powder with the particle size smaller than 0.075 mm) for 23-28s, and then spraying the hot asphalt obtained in the step (2) to mix for 55-65s to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt concrete asphalt coated aggregate has good quality, uniform color, thin consistency, no white material, yellow smoke and other abnormal phenomena, and no segregation during discharging.
Specific examples and asphalt concrete properties are as follows.
Example 1
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
adding a modifier into 10 parts by weight of asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass: 0.3:2:8, acrylate rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt waterproof paint; the addition amount of the modifier is 0.5% of the mass of the asphalt;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing the materials, dry-mixing the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) for 25 seconds, and then spraying the hot asphalt obtained in the step (2) to mix for 60 seconds to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt coated aggregate of asphalt concrete has good quality, uniform color, uniform thickness, no white material, yellow smoke and other abnormal phenomena, no segregation during discharging, and permeability coefficient of 6×10 -9 cm/s, water stability of 0.92, and meets construction requirements (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
Example 2
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
adding a modifier into 10 parts by weight of asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass: 0.5:6:12, a water-proof coating of acrylic rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt; the addition amount of the modifier is 0.2% of the mass of the asphalt;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing the materials, dry-mixing the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) for 25 seconds, and then spraying the hot asphalt obtained in the step (2) to mix for 60 seconds to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt coated aggregate of asphalt concrete has good quality, uniform color, uniform thickness, no white material, yellow smoke and other abnormal phenomena, no segregation during discharging, and permeability coefficient of 5×10 -9 cm/s, water stability of 0.94, and meets construction requirements (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
Example 3
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
adding a modifier into 10 parts by weight of asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass: 0.4:3:10, acrylate rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt waterproof paint; the addition amount of the modifier is 0.35% of the mass of the asphalt;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing the materials, dry-mixing the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) for 25 seconds, and then spraying the hot asphalt obtained in the step (2) to mix for 60 seconds to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt coated aggregate of asphalt concrete has good quality, uniform color, uniform thickness, no white material, yellow smoke and other abnormal phenomena, no segregation during discharging, and permeability coefficient of 4.0X10 -10 cm/s, water stability of 0.98, and meets construction requirements (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
Example 4
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
adding a modifier into 10 parts by weight of asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass: 0.4:8:6, acrylate rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt waterproof paint; the addition amount of the modifier is 0.35% of the mass of the asphalt;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing the materials, dry-mixing the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) for 25 seconds, and then spraying the hot asphalt obtained in the step (2) to mix for 60 seconds to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt coated aggregate of asphalt concrete has the advantages of general uniformity in color, poor consistency in thickness, white and yellow materials, segregation during discharging, and permeability coefficient of 4×10 -9 cm/s, water stability of 0.86, and meets construction requirements (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
Example 5
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
adding a modifier into 10 parts by weight of asphalt, and then heating and melting; wherein the modifier is prepared from the following components in percentage by mass: 0.8:4:14, a water-proof coating of acrylic rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt; the addition amount of the modifier is 0.35% of the mass of the asphalt;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing the materials, dry-mixing the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) for 25 seconds, and then spraying the hot asphalt obtained in the step (2) to mix for 60 seconds to obtain the asphalt concrete with the temperature controlled at 160+/-5 ℃.
The asphalt coated aggregate of asphalt concrete has the advantages of general non-uniform color, uniform thickness, white material and yellow smoke, segregation during discharging, and permeability coefficient of 6×10 -9 cm/s, water stability of 0.90, and meets construction requirements (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
Example 6
The construction method of the asphalt concrete comprises the following steps:
(1) Preheating aggregate:
uniformly and continuously feeding the aggregate into a fuel internal combustion type drying and heating cylinder and heating for 3.3min, wherein the inclination angle of the drying cylinder is 3-6 degrees, the heating temperature of the aggregate is not more than 20 ℃ of asphalt, and the heating temperature is generally required to be 170-190 ℃;
the aggregate comprises 48 parts by weight of coarse aggregate and 30 parts by weight of fine aggregate, wherein the coarse aggregate is continuous grading with the particle size not more than 19mm, and the fine aggregate is continuous grading with the particle size less than 2.5 mm.
(2) And (3) heat treatment of asphalt:
after the asphalt is unpacked, the asphalt is fed into an asphalt melting, dehydrating and heating combined device through a hydraulic automatic overturning device, and heat conduction oil is used as a medium for heating and melting, so that uniform heating is ensured, and asphalt aging is prevented;
the asphalt dehydration temperature is controlled between 110 ℃ and 130 ℃, a foaming and dehydration device is arranged to enable moisture to be vaporized and overflowed, hot asphalt is prevented from boiling over, and the water content of the asphalt after dehydration is lower than 2 per mill;
and after the asphalt is melted and dehydrated for a certain time, continuously heating, storing the asphalt for standby, wherein the heating temperature is controlled within 140 ℃, heating the asphalt to 150-170 ℃ before use, taking the upper limit temperature value in a low-temperature season, and controlling the heating time within 6 hours.
(3) Mixing:
adopting a DHB40 type asphalt concrete mixing station to mix, and preheating the mixing station before mixing to ensure that the temperature in a mixing machine is not lower than 100 ℃;
and (3) in the process of mixing materials, the hot aggregate obtained in the step (1) and 12 parts by weight of filler (limestone powder with the particle size smaller than 0.075 mm) are dry-mixed for 25 seconds, and 10 parts by weight of hot asphalt obtained in the step (2) is sprayed and mixed for 60 seconds, so that asphalt concrete with the temperature controlled at 160+/-5 ℃ is obtained.
The asphalt coated aggregate of asphalt concrete has the advantages of general non-uniform color, non-uniform thickness, white and yellow materials, segregation during discharging, and permeability coefficient of 2.5×10 -8 cm/s, water stability of 0.76, and does not meet the construction requirement (permeability coefficient is not more than 1×10) -8 cm/s, water stability not less than 0.9).
It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the invention includes, but is not limited to, the examples described in the detailed description, as other embodiments derived from the technical solutions of the invention by a person skilled in the art are equally within the scope of the invention.
Claims (9)
1. The construction method of the asphalt concrete is characterized by comprising the following steps of:
(1) Preheating aggregate: heating and drying the aggregate to obtain hot aggregate;
(2) And (3) heat treatment of asphalt: heating, melting and dehydrating asphalt to obtain hot asphalt;
adding a modifier into asphalt in the heating and melting process, wherein the adding amount of the modifier is 0.1-0.5% of the mass of the asphalt, and the mass ratio of the modifier is 5-8:0.3-0.5:2-6:8-12 of acrylate rubber, cyclodextrin, nano silicon dioxide and non-cured rubber asphalt waterproof paint;
(3) Mixing: dry-mixing the hot aggregate obtained in the step (1) with filler, and then spraying the hot asphalt obtained in the step (2) for mixing to obtain the asphalt concrete;
the aggregate in step (1) comprises coarse aggregate and fine aggregate; the coarse aggregate is continuous grading with the grain diameter not more than 19mm, and the fine aggregate is continuous grading with the grain diameter less than 2.5 mm;
the filler in the step (3) is limestone powder with the particle size smaller than 0.075 mm.
2. The method according to claim 1, wherein the temperature of the hot aggregate in step (1) is 170 to 190 ℃.
3. The construction method according to claim 1, wherein the asphalt in the step (2) is melted by heating using a heat transfer oil as a medium.
4. The method according to claim 1, wherein the hot asphalt in the step (2) has a temperature of 100-140 ℃ and a water content of less than 2%.
5. The method according to claim 1, wherein the dry mixing time in the step (3) is 23 to 28 seconds.
6. The method according to claim 1, wherein the mixing time in the step (3) is 55 to 65 seconds.
7. The method according to claim 1, wherein the mixing treatment in step (3) is preceded by preheating the mixing device.
8. Use of the construction method according to any one of claims 1-7 in high altitude asphalt concrete core wall engineering.
9. An asphalt concrete core wall obtained by the construction method according to any one of claims 1 to 7.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102027070A (en) * | 2008-08-29 | 2011-04-20 | 威廉·R·拜莱 | Rubberized asphalt pellets |
| CN105062282A (en) * | 2015-08-18 | 2015-11-18 | 苏州赛斯德工程设备有限公司 | Preparation method of rubber asphalt waterproof coating |
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| CN108165034A (en) * | 2017-12-28 | 2018-06-15 | 中冶南方城市建设工程技术有限公司 | A kind of nano-particle and lake asphalt composite modified asphalt and preparation method thereof |
| CN112646410A (en) * | 2019-10-11 | 2021-04-13 | 中国石油化工股份有限公司 | Modifier, preparation method thereof and non-cured rubber asphalt waterproof coating |
| CN111960779A (en) * | 2020-09-04 | 2020-11-20 | 广州至城建筑材料科技有限公司 | Asphalt concrete and preparation method thereof |
| CN112724696A (en) * | 2020-12-29 | 2021-04-30 | 西安理工大学 | Beta-cyclodextrin/styrene-butadiene-styrene triblock copolymer modified asphalt and preparation method thereof |
| CN114437558B (en) * | 2022-03-09 | 2023-04-28 | 安徽茵际源新材料科技有限公司 | Ultraviolet aging resistant weather-resistant asphalt and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102027070A (en) * | 2008-08-29 | 2011-04-20 | 威廉·R·拜莱 | Rubberized asphalt pellets |
| CN105062282A (en) * | 2015-08-18 | 2015-11-18 | 苏州赛斯德工程设备有限公司 | Preparation method of rubber asphalt waterproof coating |
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