CN117801400A - Preparation method of high-elastic colloid material for pavement transition layer - Google Patents
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- CN117801400A CN117801400A CN202410201240.1A CN202410201240A CN117801400A CN 117801400 A CN117801400 A CN 117801400A CN 202410201240 A CN202410201240 A CN 202410201240A CN 117801400 A CN117801400 A CN 117801400A
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- 239000000463 material Substances 0.000 title claims abstract description 82
- 239000000084 colloidal system Substances 0.000 title claims abstract description 71
- 230000007704 transition Effects 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010426 asphalt Substances 0.000 claims abstract description 129
- 239000002245 particle Substances 0.000 claims abstract description 108
- 239000005060 rubber Substances 0.000 claims abstract description 101
- 239000000835 fiber Substances 0.000 claims abstract description 83
- 238000001000 micrograph Methods 0.000 claims abstract description 18
- 238000005516 engineering process Methods 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000012545 processing Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 22
- 239000010920 waste tyre Substances 0.000 claims description 7
- 238000010008 shearing Methods 0.000 claims description 6
- 229920000728 polyester Polymers 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 238000005491 wire drawing Methods 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 abstract description 4
- 239000002699 waste material Substances 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 description 7
- 230000001965 increasing effect Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
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- 238000010276 construction Methods 0.000 description 2
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Abstract
The invention provides a preparation method of a high-elastic colloid material for a pavement transition layer, the high-elastic colloid material consists of rubber particles, asphalt and fibers, the rubber particles interact with the asphalt to expand the volume of the rubber particles, the volume expansion rate and the volume filling rate of the rubber particles are determined by utilizing a scanning electron microscope image processing technology, and 1m of the volume expansion rate and the volume filling rate are calculated 3 The volume of rubber particles in the high-elastic colloid material and the volume of asphalt interacted by the rubber particles; the asphalt is adsorbed on the surface of the fiber to form an asphalt film with a certain thickness, and the fiber is filled in the gaps after the expansion of the rubber particles after the asphalt is adsorbed on the fiber, and the volume of the fiber are calculated; calculating the volume of asphalt in the total high-elastic colloid material; calculation of 1m 3 Rubber particles, asphalt and fiber are mixed in the high-elastic colloid material. The invention adopts rubber particles as raw materials of the high-elastic colloid material, realizes the utilization of waste resources, saves resources, and is efficient and environment-friendly.
Description
Technical Field
The invention relates to the field of new materials in road engineering technology, in particular to a preparation method of a high-elastic colloid material for a road surface transition layer.
Background
For a long time, the asphalt pavement in China always adopts the design idea of Jiang Jibao surface, and the water is stable as the substitute noun of the pavement base layer, which has high early strength, good plate body property and strong diffusion stress. The water stability is affected by humidity and temperature and can shrink, the crack of the water stability base layer and the secondary diseases caused by the crack are all the time a worldwide problem, and the pavement cracking caused by the water stability crack can not be effectively solved. Along with the progress of technology, more and more scholars put forward the concept of long-life road surface, with the thickness thickening of bituminous paving, set up deformability transition layer in road surface structural layer inside, become the key that promotes bituminous paving life and quality of service.
The transition layer with good deformability is arranged in the pavement structural layer, the upward transmission of pavement cracks is delayed, meanwhile, the manufacturing cost is relatively low, the pavement structural layer is a mode with higher cost performance, at present, the transition layer comprises a modified asphalt stress absorbing layer, a sand type asphalt mixture, a high-viscosity high-elasticity modified asphalt mixture and the like, mainly adopts high-oil-stone ratio, high-performance asphalt and aggregate with finer particle size to prepare the asphalt mixture, and is paved in the pavement structural layer, the thickness of the transition layer is generally thinner, the pavement structural layer is paved according to an asphalt mixture construction process, the temperature loss is faster in the construction process, the compaction is insufficient, the effect of absorbing stress of the transition layer is difficult to achieve, meanwhile, due to the fact that the asphalt mixture type material is influenced by stone and asphalt interfaces, the deformation capability of the asphalt mixture is limited, a certain gap exists in the interior, and the bonding strength between the upper layer and the lower layer is not high.
On the other hand, as the number of automobiles increases, the number of discarded tires increases, and stacking and burning the tires is detrimental to green development, which is called "black pollution". In recent years, waste tires are processed and ground into fine rubber particles for utilization, so that the method accords with the principle of sustainable development advocated in China and has wide application prospect.
Therefore, it is necessary to provide a preparation method of a high-elastic colloid material for a pavement transition layer, which utilizes waste tires, can ensure that the waste tires have larger deformability and strong adhesion with upper and lower layers of a pavement, and can be used in the pavement transition layer, so that the durability of the pavement structure is improved.
Disclosure of Invention
Aiming at the difficult problems of adhesion, deformation and fluidity control of the high-elastic colloid material of the pavement transition layer in the use process, the invention aims to provide a preparation method of the high-elastic colloid material with good deformation coordination, strong adhesion and good fluidity, the viscosity is increased by absorbing asphalt by rubber particles, the toughness is increased by doping fiber, the volume change under the microcosmic action of asphalt and rubber particles is analyzed by a scanning electron microscope image processing technology, the asphalt acting with the rubber particles is determined, the asphalt adsorption state of the fiber is determined, the asphalt acting with the fiber is determined, the doping proportion of asphalt, fiber and rubber particles in the high-elastic colloid material is effectively controlled by the volume parameter relation, the excellent performance of each side of the material is exerted, the rubber particles are reused, and the low carbon and environmental protection are realized.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
the preparation method of the high-elastic colloid material for the pavement transition layer comprises the following steps:
(1) The high-elastic colloid material consists of rubber particles, asphalt and fibers, wherein the rubber particles interact with the asphalt to expand the volume of the rubber particles, the volume expansion rate and the volume filling rate of the rubber particles are determined by utilizing a scanning electron microscope image processing technology, and 1m of the volume filling rate is calculated 3 The volume of rubber particles in the high-elastic colloid material is calculated, and the volume of asphalt interacted with the rubber particles is calculated according to the volume expansion rate;
(2) The asphalt is adsorbed on the surface of the fiber to form an asphalt film with a certain thickness, the asphalt film is filled in the gaps after the expansion of the rubber particles after the asphalt is adsorbed by the fiber, the volume ratio of the fiber to the asphalt is determined according to the thickness of the asphalt film and the specific surface area of the fiber, and the volume of the asphalt and the volume of the fiber are calculated after the asphalt is adsorbed by the fiber and the volume of the gaps filled by the fiber are combined;
(3) The asphalt comprises asphalt interacted with rubber particles and asphalt adsorbed by fibers, and the volume of the asphalt in the total high-elastic colloid material is calculated;
(4) Calculating 1m according to the calculated volumes of the rubber particles, the asphalt and the fibers and combining the densities of the rubber particles, the asphalt and the fibers 3 Rubber particles, asphalt and fiber are mixed in the high-elastic colloid material.
The invention further discloses the following technology:
preferably, the scanning electron microscope image processing technology is that asphalt is heated to 160-170 ℃, and rubber particles and asphalt are mixed according to a volume ratio of 2:8, mixing, shearing for 2 hours by a shearing instrument, placing for 24 hours, taking out a sample, identifying the number of rubber particles in the sample by using a scanning electron microscope image identification technology, dividing a scanning electron microscope image into grids by adopting a grid method, counting the area of the rubber particles occupying the grids and the minimum inscribed rectangular area of the rubber particles, and determining the volume expansion rate and the volume filling rate according to the following formula:
wherein:-scanning electron microscope image recognition of single rubber particle area, um 2 ；/>-the number of the rubber particles in the scanning electron microscope image is the number of the grids; />-single grid area, um 2 ；/>-volume expansion rate of rubber particles,%; />-rubber particle volume filling rate,%; />-scanning electron microscope image identification of the number of particles; />-diameter of rubber particles, mm; />-minimum inscribed rectangular area of rubber particles in scanning electron microscope pattern, um 2 ；/>——1m 3 Rubber particle volume, m in high elastic colloid material 3 。
Preferably, the fiber-adsorbed pitch volume and fiber volume are calculated according to the following formula:
wherein:-volume of pitch, m, in the high-elastic colloid material, which reacts with the fibres 3 ；/>-volume of fibers in high-elastic colloid material, m 3 ；/>-thickness of asphalt film on the surface of the fiber, mm; />-specific surface area of the fiber; />Fiber density, kg/m 3 ；/>Diameter of fiber particles, mm.
Preferably, the volume of bitumen in the total highly elastic colloidal material is calculated according to the formula:
wherein:-volume of bitumen in high-elastic colloid material, m 3 ；/>-volume of bitumen in the high-elastic colloid material, m, acting with the rubber particles 3 。
Preferably, the raw material incorporation in the elastomeric gel material is calculated according to the following formula:
wherein:——1m 3 the dosage of rubber particles in the colloid material is kg; />——1m 3 The fiber dosage in the colloid material is kg; />——1m 3 Asphalt dosage in the colloid material, kg; />Rubber particle density, kg/m 3 ；/>Fiber density, kg/m 3 ；/>Asphalt density, kg/m 3 。
Preferably, the fibers in the high-elastic colloid material are granular polyester fibers, the diameters of the fibers are 3-6 mm, the rubber particles are 30-50 mesh rubber particles obtained by cleaning waste tires and then sending the waste tires to a steel wire drawing section, separating steel wires and plastics in the tires, crushing the tires into large particles by a crusher, and then sequentially entering a rubber coarse crusher and a fine crusher.
Preferably, the asphalt in the high-elastic colloid material is SBS modified asphalt, and the thickness of the fiber adsorption asphalt film is 15-25 um.
The beneficial effects of the invention are as follows:
the invention provides a preparation method of a high-elastic colloid material for a pavement transition layer, wherein a matrix material adopts high-viscosity modified asphalt, light oil in the asphalt is absorbed by rubber particles, so that an elastic increasing effect is achieved, the material has stronger elastic recovery capability and deformability, a three-dimensional net structure is formed by adding fibers, the toughness and strength of the material are further increased, the ultimate tensile strength of the material is increased, and the high-elastic colloid material has higher stress resistance capability and larger deformation coordination by increasing the elasticity of the rubber particles and toughening and reinforcing the fibers.
The invention provides a preparation method of a high-elastic colloid material for a pavement transition layer, which is characterized in that through analyzing microscopic volume change states under the action of asphalt and rubber particles, the volume relation between the rubber particles and asphalt acting on a matrix is determined, asphalt films are formed on the surfaces of the asphalt particles by adsorbing asphalt by fibers, the asphalt films are filled in gaps remained by the expanded rubber particles, the blending proportion of the fibers, the rubber particles and the asphalt is determined by establishing a volume model relation, the functions of the materials in all aspects are exerted, the high-elastic colloid material is ensured to have better performance, the proportion of raw materials is controlled and adjusted by volume parameters, and the elasticity, the toughness and the strength performance of the high-elastic colloid material are controllable.
The invention provides a preparation method of a high-elastic colloid material for a pavement transition layer, which adopts rubber particles as raw materials of the high-elastic colloid material, and regenerates industrial wastes, thereby realizing the utilization of waste resources, saving resources, and being efficient and environment-friendly.
Detailed Description
In order that the manner in which the above recited features, objects and advantages of the present invention are obtained will become readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Based on the examples in the embodiments, those skilled in the art can obtain other examples without making any inventive effort, which fall within the scope of the invention.
The preparation method of the high-elastic colloid material for the pavement transition layer comprises the steps of detecting the density of asphalt, rubber particles and fibers, wherein the density of raw materials is as follows:
TABLE 1 raw material density
1m 3 The high-elastic colloid material for the pavement transition layer is prepared by determining the doping amount of raw materials according to the following method: asphalt is wrapped on the surfaces of the rubber particles to form a certain action area, so that the volume of the rubber particles is expanded, the asphalt is heated to 160-170 ℃, the mesh number of the selected rubber particles is 40, and the volume ratio of the rubber particles to the asphalt is 2:8, mixing, shearing for 2h by a shearing instrument, placing for 24h, taking out a sample, recognizing that the number of rubber particles in the sample is 23 by using a scanning electron microscope image recognition technology, and meshing a scanning electron microscope image by using a grid method, wherein each grid area is 1 multiplied by 1um 2 The statistical area of the rubber particles occupying the grid and the minimum inscribed rectangular area of the rubber particles are as follows:
table 2 scanning electron microscope image recognition technique to obtain the rubber particle area and the minimum inscribed rectangular area
The area of the rubber particles accounting for the grid is counted, and the volume expansion rate and the volume filling rate of the rubber particles are determined according to the following formula:
example 1:
selecting granular polyester fiber with diameter of 5.1mm and specific surface area of 147m 2 And (3) kg, forming an asphalt film with a certain thickness on the surface of the fiber adsorption asphalt, wherein the thickness of the asphalt film is 20 mu m, filling the asphalt film into gaps after the expansion of rubber particles, and calculating the volume of the fiber adsorption asphalt and the volume of the fiber according to the following formula:
the calculation results from the above:=0.140， />=0.329, the asphalt comprises two parts of asphalt interacting with rubber particles and asphalt adsorbed by fibers, and the asphalt dosage is calculated according to the following formula:
the high-elastic colloid material consists of rubber particles, asphalt and fibers, and the amount of the rubber particles, asphalt and fibers doped in the high-elastic colloid material is calculated according to the following formula:
the high-elastic colloid materials for the pavement transition layer are prepared according to the proportion, and the performance test is carried out, and the results are shown in the following table:
TABLE 3 results of high elastic colloid Material Performance test
Example 2:
selecting particlesGranular polyester fiber with diameter of 3mm and specific surface area of 250m 2 And (3) kg, forming an asphalt film with a certain thickness on the surface of the fiber adsorption asphalt, wherein the thickness of the asphalt film is 15 mu m, filling the asphalt film into gaps after the expansion of rubber particles, and calculating the volume of the fiber adsorption asphalt and the volume of the fiber according to the following formula:
the calculation results from the above:=0.117，/>=0.352, the asphalt comprises two parts of asphalt interacting with rubber particles and asphalt adsorbed by fibers, and the asphalt dosage is calculated according to the following formula:
the high-elastic colloid material consists of rubber particles, asphalt and fibers, and the amount of the rubber particles, asphalt and fibers doped in the high-elastic colloid material is calculated according to the following formula:
the high-elastic colloid materials for the pavement transition layer are prepared according to the proportion, and the performance test is carried out, and the results are shown in the following table:
TABLE 4 results of high elastic colloid Material Performance test
Example 3:
selecting granular polyester fiber with diameter of 6mm and specific surface area of 125m 2 Kg, fibre adsorbing asphalt to form a layer on its surfaceAnd (3) a fixed-thickness asphalt film, wherein the thickness of the asphalt film is 25 mu m, the asphalt film is filled in the gaps after the rubber particles are expanded, and the volume of the fiber adsorption asphalt and the volume of the fiber are calculated according to the following formula:
the calculation results from the above:=0.134，/>=0.335, the asphalt comprising two parts of asphalt interacting with rubber particles and asphalt adsorbed with fibers, the asphalt dosage being calculated according to the following formula:
the high-elastic colloid material consists of rubber particles, asphalt and fibers, and the amount of the rubber particles, asphalt and fibers doped in the high-elastic colloid material is calculated according to the following formula:
the high-elastic colloid materials for the pavement transition layer are prepared according to the proportion, and the performance test is carried out, and the results are shown in the following table:
TABLE 5 high elastic colloid Material Performance test results
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The preparation method of the high-elastic colloid material for the pavement transition layer is characterized by comprising the following steps of:
(1) The high-elastic colloid material consists of rubber particles, asphalt and fibers, wherein the rubber particles interact with the asphalt to expand the volume of the rubber particles, the volume expansion rate and the volume filling rate of the rubber particles are determined by utilizing a scanning electron microscope image processing technology, and 1m of the volume filling rate is calculated 3 The volume of rubber particles in the high-elastic colloid material is calculated, and the volume of asphalt interacted with the rubber particles is calculated according to the volume expansion rate;
(2) The asphalt is adsorbed on the surface of the fiber to form an asphalt film with a certain thickness, the asphalt film is filled in the gaps after the expansion of the rubber particles after the asphalt is adsorbed by the fiber, the volume ratio of the fiber to the asphalt is determined according to the thickness of the asphalt film and the specific surface area of the fiber, and the volume of the asphalt and the volume of the fiber are calculated after the asphalt is adsorbed by the fiber and the volume of the gaps filled by the fiber are combined;
(3) The asphalt comprises asphalt interacted with rubber particles and asphalt adsorbed by fibers, and the volume of the asphalt in the total high-elastic colloid material is calculated;
(4) Calculating 1m according to the calculated volumes of the rubber particles, the asphalt and the fibers and combining the densities of the rubber particles, the asphalt and the fibers 3 Rubber particles, asphalt and fiber are mixed in the high-elastic colloid material.
2. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 1, wherein the method comprises the following steps: the image processing technology by utilizing the scanning electron microscope heats asphalt to 160-170 ℃, and rubber particles and asphalt according to the volume ratio of 2:8, mixing, shearing for 2 hours by a shearing instrument, placing for 24 hours, taking out a sample, identifying the number of rubber particles in the sample by using a scanning electron microscope image identification technology, dividing a scanning electron microscope image into grids by adopting a grid method, counting the area of the rubber particles occupying the grids and the minimum inscribed rectangular area of the rubber particles, and determining the volume expansion rate and the volume filling rate according to the following formula:
wherein: />-scanning electron microscope image recognition of single rubber particle area, um 2 ；/>-the number of the rubber particles in the scanning electron microscope image is the number of the grids; />-single grid area, um 2 ；/>-volume expansion rate of rubber particles,%; />-rubber particle volume filling rate,%; />-scanning electron microscope image identification of the number of particles; />-diameter of rubber particles, mm; />-minimum inscribed rectangular area of rubber particles in scanning electron microscope pattern, um 2 ；/>——1m 3 Rubber particle volume, m in high elastic colloid material 3 。
3. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 2, wherein the method comprises the following steps: the fiber-adsorbed pitch volume and fiber volume were calculated as follows:
wherein: />-volume of pitch, m, in the high-elastic colloid material, which reacts with the fibres 3 ；/>-volume of fibers in high-elastic colloid material, m 3 ；/>-thickness of asphalt film on the surface of the fiber, mm; />-specific surface area of the fiber; />Fiber density, kg/m 3 ；/>Diameter of fiber particles, mm.
4. A method for preparing a high elastic gel material for a pavement transition layer according to claim 3, wherein: the volume of bitumen in the total highly elastic colloidal material is calculated according to the formula:
wherein: />-volume of bitumen in high-elastic colloid material, m 3 ；/>-volume of bitumen in the high-elastic colloid material, m, acting with the rubber particles 3 。
5. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 4, wherein the method comprises the following steps: the proportion of the raw materials doped in the high-elastic colloid material is calculated according to the following formula:
wherein: />——1m 3 The dosage of rubber particles in the colloid material is kg; />——1m 3 The fiber dosage in the colloid material is kg; />——1m 3 Asphalt dosage in the colloid material, kg; />Rubber particle density, kg/m 3 ；/>Asphalt density, kg/m 3 。
6. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 1, wherein the method comprises the following steps: the fiber in the high elastic colloid material is granular polyester fiber, and the diameter of the fiber is 3-6 mm.
7. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 1, wherein the method comprises the following steps: the rubber particles are 30-50 mesh rubber particles obtained by cleaning waste tires, feeding the cleaned waste tires into a steel wire drawing section, separating steel wires and plastics in the tires, crushing the tires into large particles by a crusher, and sequentially feeding the large particles into a rubber coarse crusher and a fine crusher.
8. The method for preparing the high-elastic colloid material for the pavement transition layer according to claim 1, wherein the method comprises the following steps: asphalt in the high-elastic colloid material is SBS modified asphalt, and the thickness of asphalt film formed by adsorbing asphalt by fibers is 15-25 um.
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