CN108034271B - Composite modified warm-mix rubber asphalt and preparation method thereof - Google Patents
Composite modified warm-mix rubber asphalt and preparation method thereof Download PDFInfo
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- CN108034271B CN108034271B CN201711465327.6A CN201711465327A CN108034271B CN 108034271 B CN108034271 B CN 108034271B CN 201711465327 A CN201711465327 A CN 201711465327A CN 108034271 B CN108034271 B CN 108034271B
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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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/16—Halogen-containing compounds
- C08K2003/162—Calcium, strontium or barium halides, e.g. calcium, strontium or barium chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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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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- 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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a composite modified warm-mix rubber asphalt, which comprises the following components in percentage by weight: 2.5 to 4.5 percent of composite warm mixing agent, 1.5 to 4 percent of styrene-butadiene latex, 0.8 to 3 percent of epoxy resin, 14 to 17 percent of rubber powder, 0.2 to 1 percent of calcium chloride and 70.5 to 81 percent of matrix asphalt. The composite modified warm mix rubber asphalt has the characteristics of low construction temperature, good high and low temperature stability, strong low temperature crack resistance and the like. The construction temperature is low, energy consumption during heating of gravel and asphalt in the construction process can be reduced, energy conservation and emission reduction are realized, high and low temperature performance is good, the asphalt pavement paved by the asphalt pavement has good anti-rutting capacity, rutting and hugging of the pavement in high-temperature seasons can be effectively prevented, meanwhile, low-temperature anti-cracking performance is good, cracking of the asphalt pavement is prevented during low temperature in winter, and the pavement construction requirements of hot and cold areas can be met simultaneously.
Description
Technical Field
The invention belongs to the technical field of modern asphalt pavements, particularly relates to an asphalt material for road construction, and particularly relates to composite modified warm-mix rubber asphalt and a preparation method thereof.
Background
The rubber particles in the rubber asphalt can absorb the light oil in the asphalt to increase the volume and generate swelling action, the volume of the rubber powder after swelling reaches 30 to 40 percent of that of the cementing material, so that the light oil in the asphalt is reduced, the viscosity is increased, and on the other hand, the skeleton filling action of the rubber particles still exists, so that the change of the rubber asphalt property is the result of double actions of the quality change of the matrix asphalt and the structure change of a system.
The rubber asphalt mixture mixed by the rubber asphalt has small high-temperature permanent deformation and good anti-rutting capability; the warm-mixed asphalt is characterized in that a warm-mixed asphalt modifier is added into asphalt, and the mixing temperature and the compaction temperature of the mixture are reduced by reducing the high-temperature viscosity of the binder. The mixing and compacting temperature is reduced, so that energy can be saved, the emission of gas in a mixing plant is reduced, and the working conditions of the plant and a construction site are improved. At present, most of warm-mix rubber asphalt adopts an organic viscosity reduction method to reduce the high-temperature viscosity of the rubber asphalt, although the softening point of the rubber asphalt is improved and the high-temperature performance is good, the ductility and the penetration of the rubber asphalt are obviously reduced, so that the asphalt becomes hard and brittle, the elastic performance is reduced, the low-temperature performance of the asphalt is influenced, and the excellent performance of the rubber asphalt is influenced.
Disclosure of Invention
The invention aims to provide the composite modified warm-mix rubber asphalt with energy conservation, environmental protection, low construction temperature and excellent high and low temperature performance and the preparation method thereof.
The invention is realized by the following technical scheme:
the composite modified warm-mixed rubber asphalt comprises the following components in percentage by weight:
further, the composite warm-mixing agent is 3.5%, the styrene-butadiene latex is 3%, the epoxy resin is 2%, the rubber powder is 15%, the calcium chloride is 0.3%, the matrix asphalt is 76.2%, and the matrix asphalt is heavy traffic asphalt AH-70.
Further, the composite warm-mixing agent is 4%, the styrene-butadiene latex is 3.5%, the epoxy resin is 3%, the rubber powder is 17%, the calcium chloride is 0.3%, the matrix asphalt is 72.2%, and the matrix asphalt is heavy traffic asphalt AH-70.
Further, the composite warm mixing agent consists of aromatic oil and Sasobit warm mixing agent, wherein in the composite warm mixing agent, the mass fraction of the aromatic oil is 10% -15%, and the balance is the Sasobit warm mixing agent.
Furthermore, the Sasobit warm-mixing agent is a narrow-distribution long-chain aliphatic hydrocarbon, the main chain molecule of the Sasobit warm-mixing agent contains 40-115 carbon atoms, and the melting point of the Sasobit warm-mixing agent is more than 100 ℃.
A preparation method of composite modified warm-mix rubber asphalt, which comprises the following components in percentage by weight,
(1) putting the matrix asphalt into a special reaction kettle, heating to 105-110 ℃, and keeping the pressure at 0.1-0.3 MPa; 1.5-4% of styrene-butadiene latex and 0.8-3% of epoxy resin are added, and stirring is carried out by a stirrer in a reaction kettle, wherein the stirring time is 10-15 min, and the stirring speed is 400-600 r/min;
(2) heating at constant pressure on the basis of the step (1), adding 2.5-4.5% of the composite warm mixing agent when the temperature reaches 130-140 ℃, and increasing the stirring speed to 800-1000 r/min for 15-20 min;
(3) raising the temperature and the pressure on the basis of the step (2), adding 14-17% of rubber powder when the temperature reaches 185-190 ℃, increasing the stirring speed to 2500-3000 r/min, and increasing the pressure to 0.5-0.8 MPa;
(4) and (4) increasing the pressure at constant temperature on the basis of the step (3), adding 0.2-1% of calcium chloride after stirring for 35-40 min, increasing the pressure to 1-1.5 MPa, and stirring for 5-10 min to obtain the composite modified warm-mixed rubber asphalt.
Further, the rotating speed of the stirrer in the step (1) is 500 r/min.
Further, the composite warm-mixing agent in the step (2) is prepared by the following method: heating 10-15% of aromatic oil to 120-125 ℃, adding 85-90% of Sasobit warm mixing agent, and stirring uniformly; and adding the prepared composite warm mixing agent when the temperature reaches 130-140 ℃.
Further, the rotating speed of the stirrer in the step (3) is increased to 2600r/min, and the stirring time is 35 min.
Further, the pressure in the step (4) is 1.2 MPa.
The invention has the beneficial effects that: the composite modified warm-mixed rubber asphalt comprises the following components in percentage by weight:
the composite modified warm mix rubber asphalt has the characteristics of low construction temperature, good high and low temperature stability, strong low temperature crack resistance and the like. The construction temperature is low, energy consumption during heating of gravel and asphalt in the construction process can be reduced, energy conservation and emission reduction are realized, high and low temperature performance is good, the asphalt pavement paved by the asphalt pavement has good anti-rutting capacity, rutting and hugging of the pavement in high-temperature seasons can be effectively prevented, meanwhile, low-temperature anti-cracking performance is good, cracking of the asphalt pavement is prevented during low temperature in winter, and the pavement construction requirements of hot and cold areas can be met simultaneously.
Drawings
FIG. 1 is a process flow chart of a composite modified warm-mix rubber asphalt.
Detailed Description
The present invention will be described in detail with reference to the drawings and specific embodiments, which are illustrative of the present invention and are not to be construed as limiting the present invention.
The composite modified warm-mixed rubber asphalt comprises the following components in percentage by weight:
example 1:
the composite modified warm mix rubber asphalt comprises the following components:
according to the composition formula, the process flow chart shown in figure 1 is adopted,
1) putting the matrix asphalt into a reaction kettle, and heating to 110 ℃; blending styrene-butadiene latex and epoxy resin, and uniformly stirring by a stirring machine in a reaction kettle for 10min, wherein the rotating speed of the stirring machine is 500r/min, and the pressure is 0.1 MPa;
2) keeping the rotating speed unchanged, and adding the composite warm mixing agent when the temperature reaches 130-140 ℃ (the composite warm mixing agent is prepared by the following method: heating 10-15% of aromatic oil to 120-125 ℃, adding 85-90% of Sasobit warm mixing agent, and stirring uniformly), wherein the rotating speed of the stirrer is increased to 1000r/min, the stirring time is 15min, and the pressure is 0.1 MPa;
3) when the temperature reaches 185 ℃, adding rubber powder, increasing the rotating speed of the stirrer to 2600r/min, increasing the pressure to 0.5MPa, keeping the temperature and the rotating speed unchanged, and stirring for 35 min;
4) adding calcium chloride, keeping the temperature and the rotating speed unchanged, increasing the pressure to 1MPa, and stirring for 10min to obtain the composite modified warm-mix rubber asphalt.
The basic performance of the composite modified warm-mix rubber asphalt is as follows:
softening point: 86 deg.C
Ductility (5 ℃,5 cm/min): 45cm
Elastic recovery (%): 88
Example 2:
according to the composition formula, the process flow chart shown in figure 1 is adopted,
1) putting the matrix asphalt into a reaction kettle and heating to 105 ℃; blending styrene-butadiene latex and epoxy resin, and uniformly stirring by a special stirring machine, wherein the stirring time is 10min, the rotating speed of the stirrer is 500r/min, and the pressure is 0.1 MPa;
2) keeping the rotating speed unchanged, and adding the composite warm mixing agent when the temperature reaches 130-140 ℃ (the composite warm mixing agent is prepared by the following method: heating 10-15% of aromatic oil to 120-125 ℃, adding 85-90% of Sasobit warm mixing agent, and stirring uniformly), wherein the rotating speed of the stirrer is increased to 1000r/min, the stirring time is 15min, and the pressure is 0.1 MPa;
3) when the temperature reaches 190 ℃, adding rubber powder, increasing the rotating speed of the stirrer to 3000r/min, increasing the pressure to 0.7MPa, keeping the temperature and the rotating speed unchanged, and stirring for 35 min;
4) adding calcium chloride, keeping the temperature and the rotating speed unchanged, increasing the pressure to 1.2MPa, and stirring for 10min to obtain the composite modified warm-mix rubber asphalt.
The basic performance of the composite modified warm-mix rubber asphalt is as follows:
softening point: 90 deg.C
Ductility (5 ℃,5 cm/min): 43cm
Elastic recovery (%): 86
Aromatic oil is added to carry out composite modification on the organic viscosity reducer of the Sasobit, so that the influence of the warm mixing agent on the low-temperature performance of the rubber asphalt is improved.
Styrene-butadiene latex (SBR) is a general synthetic latex with better comprehensive performance, and the physical and mechanical properties of a film of the SBR are much lower than those of natural rubber latex. The styrene-butadiene rubber latex modified emulsified asphalt prepared by blending the styrene-butadiene latex and the asphalt has good thermal stability and durability, so that the styrene-butadiene rubber latex modified emulsified asphalt is widely applied to modification of emulsified asphalt materials in road engineering. After the SBR latex is mixed with asphalt, the asphalt is a continuous phase, and the SBR is uniformly and stably distributed in the asphalt and is a dispersed phase. At the moment, the particle size of SBR particles is small, the surface energy is large, and components with similar structures in the asphalt can be adsorbed on the surfaces of the SBR particles to reduce the surface energy, so that an interface adsorption layer is formed; in addition, under the action of the absorbed light components, swelling can occur, so that the content of components with high molecular weight in the asphalt phase is relatively increased, and the viscosity and elasticity of the asphalt are increased. The SBR latex has obvious effect of improving the low-temperature ductility of asphalt, and has small improvement range of the softening point of the asphalt.
Epoxy resin is used as a binding material of a modifier, under the action of a curing agent in the mixing process, the epoxy resin generates a ring opening reaction and forms a space network system, the ring opening reaction is an irreversible process, the formed epoxy resin asphalt condensate is a thermosetting high polymer, the material does not melt at high temperature and has higher elasticity, and common asphalt and modified asphalt are softened and flow at higher temperature. Therefore, the cured epoxy resin asphalt has different viscoelastic properties from common asphalt and modified asphalt.
Therefore, aromatic oil, styrene-butadiene latex and epoxy resin are used for carrying out composite modification on the warm-mixed rubber asphalt, so that the low-temperature ductility of the warm-mixed rubber asphalt is improved, the low-temperature creep property of the warm-mixed rubber asphalt mixture is improved on the premise of ensuring the high-temperature deformation capacity of the warm-mixed rubber asphalt, and low-temperature cracking is reduced.
The composite modified warm mix rubber asphalt has the characteristics of low construction temperature, good high and low temperature stability, strong low temperature crack resistance and the like. The construction temperature is low, energy consumption during heating of gravel and asphalt in the construction process can be reduced, energy conservation and emission reduction are realized, high and low temperature performance is good, the asphalt pavement paved by the asphalt pavement has good anti-rutting capacity, rutting and hugging of the pavement in high-temperature seasons can be effectively prevented, meanwhile, low-temperature anti-cracking performance is good, cracking of the asphalt pavement is prevented during low temperature in winter, and the pavement construction requirements of hot and cold areas can be met simultaneously.
The base asphalt used in the invention is heavy cross-linked asphalt AH-70. The composite warm mixing agent adopts an aromatic oil modified Sasobit additive, the Sasobit is a product of Sasol Wax company in south Africa, is a narrow-distribution long-chain aliphatic hydrocarbon, the main chain molecule of the Sasobit contains 40-115 carbon atoms, is a solid paraffin compound prepared in coal vaporization by adopting an FT method, is flaky or powdery, has a melting point of more than 100 ℃ and higher than that of common paraffin, and can be completely dissolved in asphalt when the temperature exceeds 115 ℃, so that the high-temperature viscosity of the asphalt can be effectively reduced, and the softening point of the asphalt can be improved. Can be stably dispersed in the asphalt only by simple mechanical stirring under the heating condition, and avoids the defects of easy segregation and difficult mixing of common polymer modifiers. The aromatic oil has the characteristics of good rubber compatibility, high temperature resistance, low volatilization and the like, can obviously improve the processability of rubber, can enhance the low-temperature performance of polymers, improves the toughness, and is beneficial to mixing and dispersing the filler. The styrene-butadiene latex is PC-1468 cation styrene-butadiene synthetic latex produced by Meidwinhiweike company, and the latex is specially used for producing high-elasticity binding materials and can also be used for producing SBR modified asphalt.
Comparative example 1:
the composition formula is as follows:
the preparation method of the warm-mixed rubber asphalt comprises the following steps: the same as example 1 except that the styrene-butadiene latex and the epoxy resin were not added.
Asphalt properties:
softening point: 81 deg.C
Ductility (5 ℃,5 cm/min): 10.2cm
Elastic recovery (%): 51
The obtained warm-mixed rubber asphalt has high softening point and good high-temperature performance, but has poor low-temperature performance and flexibility.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. It is not necessary or necessary to exhaustive all of the embodiments herein and obvious variations or modifications may be suggested by the present invention as defined by the appended claims.
Claims (8)
1. The composite modified warm-mix rubber asphalt is characterized by comprising the following components in parts by weight: the paint comprises the following components in percentage by weight:
the composite warm mixing agent consists of aromatic oil and Sasobit warm mixing agent, wherein in the composite warm mixing agent, the mass fraction of the aromatic oil is 10-15%, and the balance is the Sasobit warm mixing agent;
the Sasobit warm-mixing agent is a narrow-distribution long-chain aliphatic hydrocarbon, the main chain molecule of the Sasobit warm-mixing agent contains 40-115 carbon atoms, and the melting point of the Sasobit warm-mixing agent is more than 100 ℃.
2. The composite modified warm-mixed rubber asphalt as claimed in claim 1, wherein the asphalt comprises the following components in percentage by weight: the composite warm mixing agent is 3.5 percent, the styrene-butadiene latex is 3 percent, the epoxy resin is 2 percent, the rubber powder is 15 percent, the calcium chloride is 0.3 percent, the matrix asphalt is 76.2 percent, and the matrix asphalt is heavy traffic asphalt AH-70.
3. The composite modified warm-mixed rubber asphalt as claimed in claim 1, wherein the asphalt comprises the following components in percentage by weight: the composite warm mixing agent is 4%, the styrene-butadiene latex is 3.5%, the epoxy resin is 3%, the rubber powder is 17%, the calcium chloride is 0.3%, the matrix asphalt is 72.2%, and the matrix asphalt is heavy traffic asphalt AH-70.
4. The preparation method of the composite modified warm-mixed rubber asphalt as claimed in any one of claims 1 to 3, which comprises the following components in percentage by weight:
(1) putting the matrix asphalt into a special reaction kettle, heating to 105-110 ℃, and keeping the pressure at 0.1-0.3 MPa; 1.5-4% of styrene-butadiene latex and 0.8-3% of epoxy resin are added, and stirring is carried out by a stirrer in a reaction kettle, wherein the stirring time is 10-15 min, and the stirring speed is 400-600 r/min;
(2) heating at constant pressure on the basis of the step (1), adding 2.5-4.5% of the composite warm mixing agent when the temperature reaches 130-140 ℃, and increasing the stirring speed to 800-1000 r/min for 15-20 min;
(3) raising the temperature and the pressure on the basis of the step (2), adding 14-17% of rubber powder when the temperature reaches 185-190 ℃, increasing the stirring speed to 2500-3000 r/min, and increasing the pressure to 0.5-0.8 MPa;
(4) and (4) increasing the pressure at constant temperature on the basis of the step (3), adding 0.2-1% of calcium chloride after stirring for 35-40 min, increasing the pressure to 1-1.5 MPa, and stirring for 5-10 min to obtain the composite modified warm-mixed rubber asphalt.
5. The preparation method of the composite modified warm-mixed rubber asphalt as claimed in claim 4, wherein the preparation method comprises the following steps: the rotating speed of the stirrer in the step (1) is 500 r/min.
6. The preparation method of the composite modified warm-mixed rubber asphalt as claimed in claim 4, wherein the preparation method comprises the following steps: the composite warm mixing agent in the step (2) is prepared by the following method: heating 10-15% of aromatic oil to 120-125 ℃, adding 85-90% of Sasobit warm mixing agent, and stirring uniformly; and adding the prepared composite warm mixing agent when the temperature reaches 130-140 ℃.
7. The preparation method of the composite modified warm-mixed rubber asphalt as claimed in claim 4, wherein the preparation method comprises the following steps: and (4) increasing the rotating speed of the stirrer in the step (3) to 2600r/min, wherein the stirring time is 35 min.
8. The preparation method of the composite modified warm-mixed rubber asphalt as claimed in claim 4, wherein the preparation method comprises the following steps: the pressure in the step (4) is 1.2 MPa.
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| CN111138878A (en) * | 2020-03-06 | 2020-05-12 | 广东石油化工学院 | Warm-mix modified rubber asphalt and preparation method thereof |
| CN111519489A (en) * | 2020-05-11 | 2020-08-11 | 四川快马重工机械有限公司 | Rapid repairing material for web crack diseases and preparation process thereof |
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|---|---|---|---|---|
| JP2001123065A (en) * | 1999-10-22 | 2001-05-08 | Gaeart Kumagai Co Ltd | Mixture for pavement, method of manufacture and method of pavement |
| CN101982438A (en) * | 2010-09-30 | 2011-03-02 | 上海龙孚实业发展有限公司 | Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof |
| CN102532920A (en) * | 2010-12-17 | 2012-07-04 | 中国石油天然气股份有限公司 | Warm mixed asphalt cement and preparation method thereof |
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| JP2001123065A (en) * | 1999-10-22 | 2001-05-08 | Gaeart Kumagai Co Ltd | Mixture for pavement, method of manufacture and method of pavement |
| CN101982438A (en) * | 2010-09-30 | 2011-03-02 | 上海龙孚实业发展有限公司 | Warm-mixed styrene butadiene rubber modified bituminous mixture applicable to cold areas and preparation method thereof |
| CN102532920A (en) * | 2010-12-17 | 2012-07-04 | 中国石油天然气股份有限公司 | Warm mixed asphalt cement and preparation method thereof |
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