CN107501967B - Asphalt modifier, preparation method and asphalt mixture containing asphalt modifier - Google Patents
Asphalt modifier, preparation method and asphalt mixture containing asphalt modifier Download PDFInfo
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- CN107501967B CN107501967B CN201710744135.2A CN201710744135A CN107501967B CN 107501967 B CN107501967 B CN 107501967B CN 201710744135 A CN201710744135 A CN 201710744135A CN 107501967 B CN107501967 B CN 107501967B
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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Abstract
The invention relates to an asphalt modifier, which comprises the following components in percentage by mass: 76-87 wt% of waste tire rubber powder; 3-14 wt% of high-density polyethylene; 3-10 wt% of a rubber regenerant; the sum of the mass percentages of the raw materials is 100 wt%; the rubber regenerant is a regenerant which participates in rubber regeneration reaction at the temperature of 160-180 ℃. The asphalt modifier has simple process, can be stored for a long time, uses a large amount of waste tires, saves resources, has low cost and convenient operation, and is convenient to add in asphalt mixture; the service life of the road surface can be effectively prolonged, and the safety of road running is improved.
Description
Technical Field
The invention belongs to the field of asphalt pavement materials, and particularly relates to a preparation method of an asphalt modifier and an asphalt mixture containing the asphalt modifier.
Background
With the rapid development of the transportation industry, the traffic volume is improved year by year, the road load capacity is continuously increased, and the traditional asphalt pavement is difficult to continuously meet the requirements of modern transportation; as a novel asphalt material, the modified asphalt is gradually becoming the leading role of road construction at home and abroad through continuous upgrading and updating in practical application, and the conventional modified asphalt mainly comprises SBS modified asphalt, rubber modified asphalt and the like.
China is the largest rubber consumer country in the world and is also the first country for producing large tires. Statistically, the output of Chinese tires is over 5.62 hundred million in 2014, while the output of waste tires is about 1500 ten thousand tons and is increasing at a rate of 5-6% per year. The modification of the asphalt by the waste tire rubber powder is undoubtedly the best utilization form of the waste tire under the concept of developing green recycling economy; currently, there are two main uses of rubber modified asphalt on roads: firstly, the asphalt mixture is mixed and paved on the upper layer of the asphalt pavement so as to comprehensively improve the service performance of the pavement; and the second is used as a sealing layer, namely a stress absorbing layer, so as to inhibit the upward reflection of cracks of the pavement base.
The wet-mixed rubber asphalt concrete is a mixture formed by mixing or mixing rubber powder or rubber particles with asphalt, then serving as an adhesive and mixing with mineral aggregate, and has the defects of short storage time, necessity of using within 24 hours of production and failure otherwise; the process is complex and needs complete special processing equipment. The dry-mixed rubber asphalt concrete is a mixture prepared by firstly mixing and blending rubber powder and aggregate and then spraying asphalt into the mixture. The disadvantage of dry-mix rubber asphalt is that the rubber powder is not easy to transport and put in.
CN101671144 discloses a rubber powder modified asphalt and a preparation method thereof, which adopts a method of wet mixing rubber asphalt concrete, and the obtained rubber powder modified asphalt has excellent elasticity and deformability and good storage stability, but the stability of the rubber powder modified asphalt depends on the addition of a stabilizer, and the process is complex. CN105176115 discloses SBS rubber powder composite modified asphalt, which is prepared by preheating substrate asphalt to 180 ℃, adding SBS modifier into hot asphalt, shearing and dispersing for 20min at high speed, then adding activating agent, rubber powder and stabilizing agent, and shearing and dispersing for 2h at 185 ℃ to obtain SBS rubber powder composite modified asphalt. The method reduces the consumption of SBS and the cost of modified asphalt through the modification of SBS and rubber powder, but still has the defect of short storage time.
The method has important significance in finding the rubber modified asphalt which has simple preparation and production process, simple putting, long-term storage and low price.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the asphalt modifier which has the advantages of simple process, long-term storage and low price; the asphalt modifier comprises the following raw materials in percentage by weight:
(a) 76-87 wt% of waste tire rubber powder;
(b) 3-14 wt% of high-density low-pressure polyethylene;
(c) 3-10 wt% of rubber regenerant;
the sum of the mass percentages of the components of the asphalt modifier is 100 wt%.
The rubber regenerating agent refers to a regenerating agent which can participate in rubber regenerating reaction at the temperature of 160-180 ℃, and is preferably any one or a combination of at least two of aromatic oil, coal tar, pine tar, tall oil, naphthenic oil and regenerated grease.
The content of the rubber-regenerating agent is 3 to 10% by weight, for example, 3% by weight, 3.5% by weight, 4% by weight, 4.7% by weight, 6% by weight, 8% by weight, 9.2% by weight, 10% by weight, etc., preferably 4 to 9% by weight.
The mesh number of the waste tire rubber powder is 30-80 meshes, such as 30 meshes, 35 meshes, 40 meshes, 45 meshes, 50 meshes, 55 meshes, 60 meshes, 65 meshes, 70 meshes, 75 meshes, 80 meshes and the like, and preferably 45-65 meshes.
Preferably, the waste tire rubber powder is obtained by crushing waste tires, preferably tire tread rubber of a model above 900 of a truck; the rubber powder of the present invention can be obtained commercially.
The content of the waste tire rubber powder is 76 to 87% by weight, for example 77% by weight, 79% by weight, 80% by weight, 81% by weight, 83% by weight, 84% by weight, 87% by weight, etc., preferably 79 to 84% by weight.
The high density low pressure polyethylene is an extrusion grade high density low pressure polyethylene, and further the high density low pressure polyethylene can be obtained commercially, for example, HDPE5000S of Yanshan petrochemical, HDPE DGDD-2480NT of Dow chemical extrusion grade, HDPE PE-100 of Korean oiling and the like.
Preferably, the high density low pressure polyethylene has a density of 0.94 to 0.98g/cm3For example, 0.945g/cm, 0.947g/cm, 0.951g/cm, 0.956g/cm, 0.961g/cm, 0.968g/cm, 0.974g/cm, 0.979g/cm and the like, preferably 0.95 to 0.97g/cm, preferably 0.96 g/cm; the molecular weight of the high-density low-pressure polyethylene is 40000-300000, such as 42000, 68000, 85000, 93000, 125000, 220000, 289000 and the like, preferably 80000-200000; the high-density low-pressure polyethylene has a softening point of 120-140 ℃, such as 123 ℃, 127 ℃, 131 ℃, 139 ℃ and the like, preferably 125-135 ℃.
The high density low pressure polyethylene is present in an amount of 3 to 14 wt%, such as 3 wt%, 5 wt%, 7 wt%, 10 wt%, 12 wt%, 14 wt%, etc., preferably 5 to 12 wt%.
As a preferred technical scheme, the asphalt modifier comprises the following components in percentage by mass:
79-84 wt% of waste tire rubber powder;
5-12 wt% of high-density low-pressure polyethylene;
4-9 wt% of rubber regenerant;
the sum of the mass percentages of the components of the asphalt modifier is 100 wt%.
Preferably, the asphalt modifier comprises the following components in percentage by mass:
80 wt% of waste tire rubber powder;
11 wt% of high density low pressure polyethylene;
9 wt% of rubber regenerant;
the sum of the mass percentages of the components of the asphalt modifier is 100 wt%.
Preferably, the asphalt modifier comprises the following components in percentage by mass:
83 wt% of waste tire rubber powder;
11 wt% of high density low pressure polyethylene;
6 wt% of rubber regenerant;
the sum of the mass percentages of the components of the asphalt modifier is 100 wt%.
The asphalt modifier is a granular black solid with a particle size of 1.8-4.8mm, such as 1.8-2.3mm, 2.3-2.8mm, 2.8-3.3mm, 3.3-3.8mm, 3.8-4.3mm, 4.3-4.8mm, etc., preferably 2.0-3.0 mm.
The second purpose of the present invention is to provide a preparation method of the asphalt modifier according to the first purpose of the present invention, which comprises the following steps:
(1) heating the waste tire rubber powder to 160-180 ℃, such as 160 ℃, 170 ℃, 180 ℃ and the like;
(2) adding rubber regenerant, shearing, stirring, mixing, and developing for 40-60min, such as 42min, 45min, 48min, 51min, 54min, 55min, 56min, 60min, etc.;
(3) adding the high-density polyethylene after being heated and melted, continuously stirring, extruding, granulating, and finally cooling to room temperature to obtain the asphalt modifier.
Preferably, the shearing, stirring, extruding, pelletizing steps are performed in a plastic extruder, or a high speed shear.
The waste tire rubber powder which is a main raw material adopted by the invention is a waste tire in industry and life, and the high-density low-pressure polyethylene can be selected from industrial waste particles, and the adoption of the waste tire rubber powder and the industrial waste particles treats white and black garbage pollution, thereby really realizing the reutilization of the waste tire and the industrial waste, reducing the raw material cost and realizing the development of green recycling economy; the finished product has good stability, can be stored for a long time, is granular, and is convenient to transport and feed; and the preparation method of the modified asphalt modifier is simple and easy to implement.
It is a further object of the present invention to provide a method for using the asphalt modifier according to one of the objects of the present invention, the method comprising the steps of:
(1) an asphalt modifier according to any one of claims 1 to 5 which is at room temperature, is introduced into the heated aggregate and dry-mixed for 20 to 30 seconds, for example 20 seconds, 21 seconds, 24 seconds, 25 seconds, 27 seconds, 30 seconds, etc.;
(2) adding 160-180 ℃ asphalt and stirring for 90 s;
(3) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Preferably, the temperature of the aggregate in step (1) is 180-.
The aggregate, also known as aggregate, is one of the constituent materials of asphalt concrete known to those skilled in the art. When paving roads, the selection of aggregate is in accordance with the relevant provisions in JTG F40-2004, and typical but non-limiting aggregates are 9.5-13.2mm crushed stone, 4.75-9.5mm crushed stone, 2.36-4.75mm crushed stone, 0-2.36mm crushed stone, river sand 37:20:7:24.5: 7.
The mineral powder is a general name of stone powder and substitutes thereof meeting engineering requirements, and when the mineral powder is used in asphalt concrete, the mineral powder is obtained by grinding hydrophobic stones such as limestone or strong basic rocks in magma rocks. When paving roads, the selection of ore fines is in accordance with the relevant provisions in JTGF40-2004, as is known to the person skilled in the art.
The fourth purpose of the invention is to provide an asphalt mixture, which comprises the following components in percentage by mass:
preferably, the asphalt modifier is added in an amount of 4-5 wt%, preferably 4.5 wt%, in the asphalt mixture.
Further, the asphalt mixture is obtained according to the using method of the asphalt modifier.
5% of the asphalt modifier according to one of the purposes of the invention is added into the asphalt mixture, the dynamic stability of the asphalt modifier can reach more than 5000/time, the stability of the asphalt modifier can reach more than 12/KN, and the cost of the asphalt modifier is 15% lower than that of SBS modified asphalt; of course, in the actual road paving process, the actual requirements can be met by adding 5% of the asphalt modifier according to one of the objects of the invention.
After the preparation of the asphalt mixture is finished, the road can be directly paved, namely the asphalt mixture is paved and compacted.
The asphalt mixture can effectively prolong the service life of the pavement by 1-3 times, and can save the cost by adopting a direct-throwing mode.
The fifth purpose of the invention is to provide the application of the waste tire, wherein the rubber powder prepared from the waste tire is added into the asphalt modifier.
Compared with the prior art, the invention has the following beneficial effects:
(1) the process is simple: the asphalt modifier has simple preparation process; in the using process of the asphalt modifier, the asphalt modifier is added into the asphalt mixture while the hot aggregate is measured in the asphalt mixture, the components of the asphalt mixture are not required to be added at different time intervals, the process is simple and easy to operate, and the adding time is not required to be strictly controlled.
(2) The cost is low: in the asphalt modifier provided by the invention, a large amount of industrial waste is added, so that the cost can be reduced, the environmental protection performance is good, and in order to obtain a good effect at the same time, a proper formula composition is adjusted, such as adding a proper amount of high-density polyethylene to obtain good mechanical performance, freeze-thaw cleavage residual strength, soaking residual stability and the like; the addition of the regenerant which participates in the rubber regeneration reaction at 160-180 ℃ can complete the modification of the waste tire rubber in the process of preparing the asphalt modifier, so that the stability of the asphalt modifier, such as dynamic stability, freeze-thaw cleavage residual strength, soaking residual stability and the like, can be improved after the asphalt modifier is added into the asphalt mixture.
(3) The comprehensive performance is good: the asphalt modifier is finally granular, is convenient to transport and has long storage time; the asphalt mixture can prolong the service life of the road by 1-3 times, the carbon black in the rubber can blacken the road surface, the contrast with the marked line is high, and the safety of road running is improved; the thickness of the asphalt paving layer can be effectively reduced, and the low-temperature crack resistance of the pavement can be improved.
Drawings
FIG. 1 is a flow chart of the process for preparing the asphalt modifier according to the present invention;
FIG. 2 is a flow chart of the mixing process of the asphalt mixture according to the present invention.
Detailed Description
For the purpose of facilitating an understanding of the present invention, the present invention will now be described by way of examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1:
an asphalt modifier comprises the following components in percentage by mass:
76 wt% of waste tire rubber powder;
14 wt% of high density low pressure polyethylene;
10 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating the waste tire rubber powder to 160 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 60min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 1.8-2.3mm, thus obtaining the asphalt modifier.
Application example 1:
the asphalt modifier provided in example 1 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
aggregate 90 wt%;
3 wt% of asphalt;
4 wt% of mineral powder;
example 1 provides an asphalt modifier of 3 wt%.
The preparation method comprises the following steps:
(1) the aggregate is heated to 180 c,
(2) the asphalt modifier at room temperature is put into the heated aggregate, and is dry-mixed for 30s,
(3) adding asphalt with the temperature of 160 ℃, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 2:
the asphalt modifier comprises the following components in percentage by mass:
80 wt% of waste tire rubber powder;
11 wt% of high density low pressure polyethylene;
9 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating the waste tire rubber powder to 170 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 45min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 2.3-2.8mm, thus obtaining the asphalt modifier.
Application example 2:
the asphalt modifier provided in example 2 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
87 wt% of aggregate;
3.5 wt% of asphalt;
6 wt% of mineral powder;
example 2 provides an asphalt modifier of 3.5 wt%.
The preparation method comprises the following steps:
(1) the aggregate was heated to 190 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, and is dry-mixed for 20s,
(3) adding asphalt at 170 ℃, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 3:
the asphalt modifier comprises the following components in percentage by mass:
83 wt% of waste tire rubber powder;
11 wt% of high density low pressure polyethylene;
6 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating the waste tire rubber powder to 180 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 40min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 2.8-3.3mm, thus obtaining the asphalt modifier.
Application example 3:
the asphalt modifier provided in example 3 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
82 wt% of aggregate;
5 wt% of asphalt;
9 wt% of mineral powder;
example 3 provides 4 wt% asphalt modifier.
The preparation method comprises the following steps:
(1) the aggregate was heated to 185 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, dry-mixed for 25s,
(3) adding 180 ℃ asphalt, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 4:
the asphalt modifier comprises the following components in percentage by mass:
87 wt% of waste tire rubber powder;
3 wt% of high-density low-pressure polyethylene;
10 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating waste tire rubber powder to 165 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 50min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 3.3-3.8mm, thus obtaining the asphalt modifier.
Application example 4:
the asphalt modifier provided in example 4 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
79 wt% of aggregate;
6.5 wt% of asphalt;
10 wt% of mineral powder;
example 4 provides 4.5 wt% asphalt modifier.
The preparation method comprises the following steps:
(1) the aggregate was heated to 187 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, and is dry-mixed for 26s,
(3) adding asphalt at 175 ℃, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 5:
the asphalt modifier comprises the following components in percentage by mass:
87 wt% of waste tire rubber powder;
10 wt% of high density low pressure polyethylene;
3 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating the waste tire rubber powder to 161 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 49min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 3.8-4.3mm, thus obtaining the asphalt modifier.
Application example 5:
the asphalt modifier provided in example 5 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
78 wt% of aggregate;
7 wt% of asphalt;
10 wt% of mineral powder;
example 5 provides an asphalt modifier of 5 wt%.
The preparation method comprises the following steps:
(1) the aggregate is heated to 180 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, dry-mixed for 30s,
(3) adding asphalt with the temperature of 160 ℃, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 6:
the asphalt modifier comprises the following components in percentage by mass:
79 wt% of waste tire rubber powder;
12 wt% of high density low pressure polyethylene;
9 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating waste tire rubber powder to 172 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 58min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 4.3-4.8mm, thus obtaining the asphalt modifier.
Application example 6:
the asphalt modifier provided in example 6 was added to the asphalt mixture in proportion, the specific steps were as follows:
the asphalt mixture comprises the following components in percentage by mass:
aggregate 81 wt%;
6 wt% of asphalt;
7.5 wt% of mineral powder;
example 6 provides an asphalt modifier of 5.5 wt%.
The preparation method comprises the following steps:
(1) the aggregate was heated to 185 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, dry-mixed for 25s,
(3) adding 180 ℃ asphalt, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 7:
the asphalt modifier comprises the following components in percentage by mass:
84 wt% of waste tire rubber powder;
8 wt% of high-density low-pressure polyethylene;
4 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating waste tire rubber powder to 178 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 59min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 3.3-3.8mm, thus obtaining the asphalt modifier.
Application example 7:
the asphalt modifier provided in example 7 was added to the asphalt mixture in a ratio of the following specific steps:
the asphalt mixture comprises the following components in percentage by mass:
80 wt% of aggregate;
7 wt% of asphalt;
7 wt% of mineral powder;
example 7 provides an asphalt modifier of 6 wt%.
The preparation method comprises the following steps:
(1) the aggregate was heated to 190 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, and is dry-mixed for 20s,
(3) adding asphalt at 170 ℃, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Example 8:
the asphalt modifier comprises the following components in percentage by mass:
86 wt% of waste tire rubber powder;
5 wt% of high-density low-pressure polyethylene;
9 wt% of rubber regenerant.
The preparation method comprises the following steps:
heating the waste tire rubber powder to 164 ℃, adding a rubber regenerant, shearing, stirring, mixing and developing for 48min, finally adding the heated and melted high-density polyethylene, continuing stirring, extruding and granulating, and finally cooling to room temperature to prepare granular black solid with the grain diameter of 1.8-2.3mm, thus obtaining the asphalt modifier.
Application example 8:
the asphalt modifier provided in example 1 is added to the asphalt mixture in proportion, and the specific steps are as follows:
the asphalt mixture comprises the following components in percentage by mass:
85 wt% of aggregate;
4 wt% of asphalt;
5 wt% of mineral powder;
example 8 provides an asphalt modifier of 6 wt%.
The preparation method comprises the following steps:
(1) the aggregate was heated to 185 c,
(2) the asphalt modifier at room temperature is added into the heated aggregate, dry-mixed for 22s,
(3) adding 180 ℃ asphalt, and stirring for 90 s;
(4) adding mineral powder at room temperature, and stirring for 90s to obtain the asphalt mixture.
Comparative example 1
The asphalt described in application example 1 was used as comparative example 1.
Comparative example 2
The SBS modified asphalt mixture comprises the following components in percentage by mass:
aggregate 90 wt%;
5 wt% of SBS modified asphalt;
5 wt% of mineral powder.
The SBS modified asphalt is well known to those skilled in the art and is modified by SBS. Each index of the SBS modified asphalt meets the regulation of JTG F40-2004.
The preparation method of the SBS modified asphalt mixture comprises the following steps: heating the aggregate and the mineral powder to 180 ℃, adding SBS modified asphalt at 160 ℃, and stirring for 90 s; thus obtaining the SBS modified asphalt mixture.
Comparative example 3
Compared with the embodiment 1 and the application embodiment 1, the difference is only that the formulation composition of the asphalt modifier is different, and the asphalt modifier used in the comparative example 3 comprises the following components in percentage by mass:
84 wt% of waste tire rubber powder;
14 wt% of high density low pressure polyethylene;
2 wt% of rubber regenerant.
Comparative example 4
Compared with the embodiment 1 and the application embodiment 1, the difference is only that the formulation composition of the asphalt modifier is different, and the asphalt modifier used in the comparative example 4 comprises the following components in percentage by mass:
75 wt% of waste tire rubber powder;
14 wt% of high density low pressure polyethylene;
11 wt% of rubber regenerant.
And (3) performance testing:
taking application example 1 as an example, the performance test of the asphalt mixture is as follows:
(1) dynamic stability test
The asphalt mixture is made into a standard test piece with the size of 300mm multiplied by 50mm, a solid rubber tire with the wheel pressure of 0.7MPa is used for walking on the standard test piece at the specified temperature of 60 ℃, the speed is 6 times of round trip/minute, and the test piece is tested to be in the deformation stabilization period, namely the number of times of walking is required when the deformation of 1mm is increased after the experiment is started for 50min, namely the dynamic stability is obtained.
(2) Stability test
Placing the test piece and the Marshall upper and lower pressure heads in a constant temperature water bath at 60 ℃, preserving heat for 40min, placing the test piece between the upper and lower pressure heads, and aligning the test piece with the pressure head and the sensor for load test; and in the test process, the test piece bears load, the loading speed is (50 +/-5) mm/min, and the maximum value read by the load testing device is the stability of the test piece.
(3) Freezing thawing splitting experiment
The molding of the test piece was performed with reference to (ZY01-243-2008), and the freeze-thaw test piece was double-faced compacted 50 times. Soaking the standard sample in water at 25 deg.C for 2h, and measuring splitting strength; putting the freeze-thaw sample into a negative pressure container, soaking in water in vacuum for 15min, recovering to normal pressure, then placing in water for 0.5h, placing the test piece into a plastic bag filled with 10mL of water after being saturated with water, freezing for 16h in an environment at-18 ℃, then placing the test piece into a water bath at 60 ℃ for 24h, finally placing the test piece into water at 25 ℃ for soaking for 2h, and determining the splitting strength.
The ratio of the freeze-thaw splitting residual strength (the splitting tensile strength of the sample after freeze-thaw/the splitting tensile strength of the standard sample) is multiplied by 100%
(4) Stability of water immersion residue
The only difference between the water immersion marshall test method and the standard marshall test method (stability test method) is that the test piece was kept in a constant temperature water bath at 60 ℃ for 48 hours.
The immersion residual stability is obtained by the following formula:
the soaking residual stability (stability after soaking the sample in water for 48 hours/sample stability) × 100%
With reference to the above tests, performance tests were performed on application examples 1 to 8, and the test results are shown in table 1:
TABLE 1 asphalt mixture Performance test results
As can be seen from Table 1, the dynamic stability of the asphalt mixture obtained by the invention reaches more than 5000 times/mm, the stability reaches more than 12kN, and the freeze-thaw cleavage residual strength ratio reaches more than 80%, and the performances prove that the asphalt mixture provided by the invention can prolong the service life of roads.
Comparative examples 1-4 the above performance tests were conducted to obtain test results, and application example 1, comparative example 1 and comparative example 2 were compared in performance, and the data are shown in table 2:
table 2 results of performance test using comparative example 1, comparative example 1 and comparative example 2
| Concrete technological index | Comparative example 1 | Comparative example 2 | Application example 1 |
| Degree of dynamic stability (times/mm) | 1000 | 3000 | 5000 |
| Stability (kN) | 7.9 | 11.4 | 12.0 |
| Freeze-thaw cleavage residual strength ratio% | 75.0 | 84.3 | 80.2 |
| Degree of stability of soaking residue/%) | 80.0 | 85.1 | 85.0 |
| Material cost/%) | 100 | 120 | 105 |
As can be seen from Table 2, compared with SBS modified asphalt, the asphalt mixture provided by the invention has higher dynamic stability, i.e. the pavement has longer service life. Although the SBS modified asphalt has little difference with other performances of the invention, the cost of the invention is lower compared with that of the SBS modified asphalt due to higher price of SBS.
The performance data for application example 1, comparative example 3 and comparative example 4 are shown in table 3:
table 3 results of performance tests using comparative example 1, comparative example 3 and comparative example 4
| Concrete technological index | Comparative example 3 | Comparative example 4 | Application example 1 |
| Degree of dynamic stability (times/mm) | 3010 | 3120 | 5000 |
| Stability (kN) | 10.1 | 10.5 | 12.0 |
| Freeze-thaw cleavage residual strength ratio% | 77.2 | 78.3 | 80.2 |
| Degree of stability of soaking residue/%) | 82.6 | 83.1 | 85.0 |
As can be seen from tables 1, 2 and 3, the asphalt modifier is added into the asphalt mixture by adjusting the formula of the asphalt modifier to obtain the asphalt mixture with excellent performance, wherein the dynamic stability reaches more than 5000 times/mm, the stability reaches more than 12kN, and the ratio of the freeze-thaw cleavage residual strength reaches more than 80 percent, and the performances prove that the asphalt mixture provided by the invention can prolong the service life of roads. In addition, as can be seen from the examples and the application examples, the preparation processes of the asphalt modifier and the asphalt mixture are simple and easy to implement.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (11)
1. The asphalt mixture with the dynamic stability of more than 5000 times/mm, the stability of more than 12kN and the freeze-thaw cleavage residual strength ratio of more than 80 percent is characterized by comprising the following components in percentage by mass:
the asphalt modifier comprises the following components in percentage by mass:
76-87 wt% of waste tire rubber powder;
3-14 wt% of high-density polyethylene;
3-10 wt% of a rubber regenerant;
the sum of the mass percentages of the raw materials of the asphalt modifier is 100 wt%;
the rubber regenerating agent participates in rubber regeneration reaction at the temperature of 160-180 ℃; the rubber regenerant is selected from any one or a combination of at least two of aromatic oil, coal tar, pine tar, tall oil, naphthenic oil and regenerated grease;
the preparation method of the asphalt modifier comprises the following steps:
(1) heating the waste tire rubber powder to 160-180 ℃;
(2) adding rubber regenerant, shearing, stirring, and mixing for 40-60 min;
(3) adding the high-density polyethylene after being heated and melted, continuously stirring, extruding, granulating, and finally cooling to room temperature to obtain the asphalt modifier.
2. The asphalt mixture according to claim 1, wherein said rubber powder has a mesh size of 30-80 mesh, and said rubber powder is obtained by pulverizing waste tires.
3. The asphalt mixture according to claim 1, wherein said rubber powder is obtained by pulverizing a tire tread rubber of a model of a truck 900 or more.
4. The asphalt mixture according to claim 1, wherein said high density polyethylene is an extruded high density polyethylene having a density of 0.94 to 0.98g/cm3The molecular weight is 40000-300000, and the softening point is 120-140 ℃.
5. The asphalt mixture according to claim 1, wherein said asphalt modifier is formulated as a black solid in the form of particles having a particle size of 1.8-4.8 mm.
6. The asphalt mixture according to claim 5, wherein the particle size of said asphalt modifier is 2.0-3.0 mm.
7. The asphalt mixture according to claim 1, wherein the asphalt modifier is added in an amount of 4 to 5 wt%.
8. The asphalt mixture according to claim 1, wherein the asphalt modifier is added in an amount of 4.5 wt%.
9. The asphalt mix of claim 1 wherein said shearing, agitating, extruding steps are performed in a plastic extruder, or a high speed shear.
10. A method for preparing an asphalt mixture according to any one of claims 1 to 9, characterized in that it comprises the following steps:
(1) putting the asphalt modifier at room temperature into the heated aggregate, and dry-mixing for 20-30 s;
(2) adding 160-180 ℃ asphalt and stirring for 90 s;
(3) adding mineral powder at room temperature, and stirring for 90 s.
11. The method as claimed in claim 10, wherein the temperature of the aggregate in step (1) is 180-190 ℃.
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| CN109400949A (en) * | 2018-09-19 | 2019-03-01 | 许慧 | A kind of high-performance waste asphalt reducing agent and preparation method thereof |
| CN109231894B (en) * | 2018-10-20 | 2021-08-24 | 四川志德公路工程有限责任公司 | Asphalt mixture for roads and preparation method thereof |
| CN109824289B (en) * | 2019-03-28 | 2021-07-20 | 北京华建盛和科技发展有限公司 | High-modulus modifier for asphalt concrete and preparation method and application thereof |
| CN110183147B (en) * | 2019-04-30 | 2021-09-03 | 中国建筑土木建设有限公司 | Asphalt mixture for environment-friendly road and preparation method thereof |
| CN110885564B (en) * | 2019-12-05 | 2022-06-17 | 邓棋文 | Hot-recycling asphalt mixture recycling agent |
| CN111218122A (en) * | 2020-02-26 | 2020-06-02 | 上海永玺环境科技有限公司 | Fiber-containing modifier for asphalt and preparation method of modifier asphalt mixture |
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| US20100056669A1 (en) * | 2008-08-29 | 2010-03-04 | Bailey William R | Rubberized asphalt pellets |
| KR20110026038A (en) * | 2009-09-07 | 2011-03-15 | 허정도 | Temperature-controlled modified recycling mixes for reuse of 100% rap in road pavements and manufacturing methods thereof |
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