CN114199718A - Method for detecting dissolution rate and particle size distribution of rubber powder in rubber powder modified asphalt - Google Patents
Method for detecting dissolution rate and particle size distribution of rubber powder in rubber powder modified asphalt Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 239
- 229920001971 elastomer Polymers 0.000 title claims abstract description 196
- 239000010426 asphalt Substances 0.000 title claims abstract description 113
- 239000002245 particle Substances 0.000 title claims abstract description 79
- 238000009826 distribution Methods 0.000 title claims abstract description 73
- 238000004090 dissolution Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005303 weighing Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 13
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 239000004677 Nylon Substances 0.000 claims description 6
- 239000006185 dispersion Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- 206010013954 Dysphoria Diseases 0.000 claims description 4
- 239000002904 solvent Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 9
- 239000008096 xylene Substances 0.000 description 11
- 229920002209 Crumb rubber Polymers 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 5
- 230000035515 penetration Effects 0.000 description 4
- 239000003381 stabilizer Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000010920 waste tyre Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0272—Investigating particle size or size distribution with screening; with classification by filtering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
- G01N2001/4088—Concentrating samples by other techniques involving separation of suspended solids filtration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N2015/0288—Sorting the particles
Abstract
The invention belongs to the field of road engineering, and particularly relates to a method for detecting the dissolution rate and particle size distribution of rubber powder in rubber powder modified asphalt. A method for detecting the dissolution rate of rubber powder in rubber powder modified asphalt comprises the following steps: (1) pretreating, (2) weighing, dispersing, (3) filtering, (4) drying, weighing, and (5) respectively calculating to obtain the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt. The method has the advantages that: (1) low-temperature dissolution, rapidness and accuracy, and further defines the distribution state of the rubber powder in the rubber powder modified asphalt. (2) Energy saving and safety. (3) The detection cost is low and the representativeness is strong.
Description
Technical Field
The invention belongs to the field of road engineering, and particularly relates to a method for detecting the dissolution rate and particle size distribution of rubber powder in rubber powder modified asphalt.
Background
In recent years, with the steady development of Chinese economy and the rapid development of the automobile industry in China, a large amount of waste rubber tires are generated, so that black pollution is caused, and the environmental protection problem caused by a large amount of waste tires is brought. The recycling of the waste rubber is an effective way for solving the resource shortage and the environmental pollution.
Currently, the technology of modifying asphalt by using waste rubber powder is widely applied. Rubber asphalt is introduced into the field of road engineering, so that not only can waste tires be effectively consumed to reduce the pollution to the environment, but also the waste can be converted into limited asphalt resources. In the face of the current complex asphalt pavement service conditions, the rubber asphalt pavement has more excellent fatigue resistance, ageing resistance, rutting resistance, high-temperature stability and low-temperature flexibility, and is more and more widely applied to the field of road engineering.
The rubber asphalt is prepared by processing, crushing, grinding and cracking automobile waste tires to obtain rubber powder particles with certain strength and shape, mixing the waste tire rubber powder with matrix asphalt at a proper temperature, and heating, stirring or shearing and grinding the mixture.
In the process of preparing the rubber asphalt, the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt have high relevance to the performance and the index of the rubber powder modified asphalt, so that the determination of the dissolution rate and the particle size distribution of the rubber powder after the dissolution in the asphalt has important significance to the research of the modification mechanism of the rubber powder modified asphalt.
At present, no method for simply measuring the dissolution rate and the particle size distribution of the rubber powder after the rubber powder is swelled and dissolved in the rubber powder modified asphalt exists at home and abroad. The existing method for determining the dissolution condition of rubber powder in rubber powder modified asphalt generally refers to an asphalt extraction method, wherein high-temperature organic gas is used for extracting the asphalt, and the rubber powder modified asphalt can be further attenuated under the condition of long-time high temperature, so that the detection result is inaccurate.
Disclosure of Invention
The invention aims to provide a rapid, accurate, energy-saving and safe method for detecting the dissolution rate and the particle size distribution of rubber powder in rubber powder modified asphalt.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method for detecting the dissolution rate of rubber powder in rubber powder modified asphalt comprises the following steps:
(1) pretreatment:
preheating the rubber powder modified asphalt at 160 ℃ for 1.5-3 h, dropping the rubber powder modified asphalt on a metal disc by using a glass rod to form particles, immediately placing the metal disc in a freezer at-20 ℃ for cooling for more than or equal to 1h, and after cooling, shoveling the asphalt on the disc by using a shovel for later use;
(2) weighing and dispersing:
weighing 2g +/-0.2 g of pretreated rubber powder modified asphalt with the known rubber powder mixing amount of X percent, and recording as M; adding dimethylbenzene into the weighed rubber powder modified asphalt, and stirring for 10-25 min for dispersing to obtain a dispersion liquid;
(3) and (3) filtering:
weighing regular 30, 40, 50, 60, 80, 100, 120, 160, 200 mesh sieves with same size, and recording as M30、M40、M50、M60、M80、M100、M20、M160、M200；
Filtering the dispersion solution with 30, 40, 50, 60, 80, 100, 120, 160 and 200 mesh sieves in sequence;
(4) drying and weighing:
the filtered mesh was dried, cooled, weighed and recorded as M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200′；
(5) And (3) calculating:
the dissolution rate Y of the rubber powder in the rubber powder modified asphalt is calculated according to the following formula,
Y＝(M×X％-Mrubber powder)/(M×X％)；
Wherein, M is the mass of the rubber powder modified asphalt sample;
x percent is the mixing amount of the rubber powder in the rubber powder modified asphalt formula;
Mrubber powderIs the sum of the masses of the residues on the screens of various meshes, i.e. MRubber powder＝(M30′-M30)+(M40′-M40)+(M50′-M50)+(M60′-M60)+(M80′-M80)+(M100′-M100)+(M120′-M120)+(M160′-M160)+(M200′-M200）。
Further, the rubber powder modified asphalt in the step (1) is preheated to have good fluidity.
Further, the size of the particles formed by dropping the glass rods on the metal disc in the step (1) is less than or equal to 5 mm.
Further, the amount of the xylene added in the step (2) is 40 times of the mass of the crumb rubber modified asphalt.
Further, in the filtering of each screen in the step (3), the residue on the screen is washed by a pressure watering pot containing xylene solvent while stirring by using a glass member until the xylene dripping liquid is colorless.
Further, the screen in the step (3) is a nylon screen.
Further, in the step (4), the screen mesh is placed in an air-blast dysphoria box at the temperature of 80 ℃ for drying for 1 hour; and after drying, putting the mixture into a drying oven to be cooled for 10 min.
The invention also provides a method for detecting the particle size distribution of the rubber powder in the rubber powder modified asphalt.
A detection method for the particle size distribution of rubber powder in rubber powder modified asphalt is provided, which comprises the following steps:
treating the rubber powder modified asphalt according to the steps (1) to (4) in the detection method of the dissolution rate of the rubber powder in the rubber powder modified asphalt to obtain M30、M40、M50、M60、M80、M100、M120、M160、M200、M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200′And MRubber powder；
The rubber powder particle size distribution in the rubber powder modified asphalt is calculated according to the following formula,
the particle size distribution of the rubber powder smaller than 30 meshes is (M)30′-M30)/MRubber powder×100％；
Particle size distribution of 30 mesh rubber powder (M)40′-M40)/MRubber powder*100％；
Particle size distribution (M) of 40 mesh rubber powder50′-M50)/MRubber powder*100％；
Particle size distribution (M) of 50 mesh rubber powder60′-M60)/MRubber powder*100％；
Particle size distribution (M) of 60 mesh rubber powder80′-M80)/MRubber powder*100％；
Particle size distribution (M) of 80 mesh rubber powder100′-M100）/MRubber powder*100％；
Particle size distribution (M) of 100 mesh rubber powder120′-M120)/MRubber powder*100％；
Particle size distribution (M) of 120 mesh rubber powder160′-M160)/MRubber powder*100％；
Particle size distribution (M) of 160-mesh rubber powder200′-M200)/MRubber powder*100％。
According to the method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt, provided by the invention, the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt after high-temperature shearing or aging are rapidly, efficiently and accurately detected through a low-temperature granulation technology, a room-temperature rapid and efficient dissolution process and a suspension screening process.
The invention provides a method for detecting the dissolution rate and the particle size distribution of rubber powder in rubber powder modified asphalt, which comprises the steps of measuring and calculating under normal temperature conditions; the dissolution time is greatly reduced. The dissolving efficiency is improved by a low-temperature physical granulation method for the rubber powder modified asphalt; the particle size distribution of the rubber powder in the rubber powder modified asphalt after high-temperature shearing or aging is analyzed by adopting a method of filtering the xylene suspension of the rubber powder modified asphalt step by step.
The method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt provided by the invention does not need to be carried out under a heating condition, so that the energy consumption is saved, and the potential safety hazard of operators is reduced. The method for filtering the suspension solution step by step is adopted, the particle size distribution condition of the rubber powder after swelling and dissolving in the asphalt is intuitively proved, the particle size distribution can be related to the technical indexes and the processing technological parameters of the rubber powder modified asphalt, and theoretical guidance is provided for optimizing the technological parameters. Compared with a method for observing the size of the micro-dissolved particle size by using an electron microscope and a fluorescence microscope, the method is low in detection cost and high in representativeness.
Compared with the prior art, the method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt has the advantages that:
(1) low-temperature dissolution, rapidness and accuracy, and further defines the distribution state of the rubber powder in the rubber powder modified asphalt.
(2) Energy saving and safety.
(3) The detection cost is low and the representativeness is strong.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following examples further describe the present invention in detail, and the following examples are only used for illustrating the present invention, but not for limiting the scope of the present invention.
A method for detecting the dissolution rate of rubber powder in rubber powder modified asphalt comprises the following steps:
(1) pretreatment:
preheating the rubber powder modified asphalt at 160 ℃ for 1.5-3 h, dropping the rubber powder modified asphalt on a metal disc by using a glass rod to form particles, immediately placing the metal disc in a freezer at-20 ℃ for cooling for more than or equal to 1h, and after cooling, shoveling the asphalt on the disc by using a shovel for later use;
(2) weighing and dispersing:
weighing 2g +/-0.2 g of pretreated rubber powder modified asphalt with the known rubber powder mixing amount of X percent, and recording as M; adding dimethylbenzene into the weighed rubber powder modified asphalt, and stirring for 10-25 min for dispersing to obtain a dispersion liquid;
(3) and (3) filtering:
weighing regular 30, 40, 50, 60, 80, 100, 120, 160, 200 mesh sieves with same size, and recording as M30、M40、M50、M60、M80、M100、M120、M160、M200；
Filtering the dispersion solution with 30, 40, 50, 60, 80, 100, 120, 160 and 200 mesh sieves in sequence;
(4) drying and weighing:
the filtered mesh was dried, cooled, weighed and recorded as M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200′；
(5) And (3) calculating:
the dissolution rate Y of the rubber powder in the rubber powder modified asphalt is calculated according to the following formula,
Y＝(M×X％-Mrubber powder)/(M×X％)；
Wherein, M is the mass of the rubber powder modified asphalt sample;
x percent is the mixing amount of the rubber powder in the rubber powder modified asphalt formula;
Mrubber powderIs the sum of the masses of the residues on the screens of various meshes, i.e. MRubber powder＝(M30′-M30)+(M40′-M40)+(M50′-M50)+(M60′-M60)+(M80′-M80)+(M100′-M100)+(M120′-M120)+(M160′-M160)+(M200′-M200）。
Further, the rubber powder modified asphalt in the step (1) is preheated to have good fluidity.
Further, the size of the particles formed by dropping the glass rods on the metal disc in the step (1) is less than or equal to 5 mm.
Further, the amount of the xylene added in the step (2) is 40 times of the mass of the crumb rubber modified asphalt.
Further, in the filtering of each screen in the step (3), the residue on the screen is washed by a pressure watering pot containing xylene solvent while stirring by using a glass member until the xylene dripping liquid is colorless.
Further, the screen in the step (3) is a nylon screen.
Further, in the step (4), the screen mesh is placed in an air-blast dysphoria box at the temperature of 80 ℃ for drying for 1 hour; and after drying, putting the mixture into a drying oven to be cooled for 10 min.
The invention also provides a method for detecting the particle size distribution of the rubber powder in the rubber powder modified asphalt.
A detection method for the particle size distribution of rubber powder in rubber powder modified asphalt is provided, which comprises the following steps:
treating the rubber powder modified asphalt according to the steps (1) to (4) in the detection method of the dissolution rate of the rubber powder in the rubber powder modified asphalt to obtain M30、M40、M50、M60、M80、M100、M120、M160、M200、M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200′And MRubber powder；
The rubber powder particle size distribution in the rubber powder modified asphalt is calculated according to the following formula,
the particle size distribution of the rubber powder smaller than 30 meshes is (M)30′-M30)/MRubber powder×100％；
Particle size distribution of 30 mesh rubber powder (M)40′-M40)/MRubber powder×100％；
Particle size distribution (M) of 40 mesh rubber powder50′-M50)/MRubber powder×100％；
Particle size distribution (M) of 50 mesh rubber powder60′-M60)/MRubber powder×100％；
Particle size distribution of 60-mesh rubber powder＝(M80′-M80)/MRubber powder×100％；
Particle size distribution (M) of 80 mesh rubber powder100′-M100)/MRubber powder×100％；
Particle size distribution (M) of 100 mesh rubber powder120′-M120)/MRubber powder×100％；
Particle size distribution (M) of 120 mesh rubber powder160′-M160)/MRubber powder×100％；
Particle size distribution (M) of 160-mesh rubber powder200′-M200)/MRubber powder×100％。
Example 1
Detection of dissolution rate of rubber powder in rubber powder modified asphalt
Selecting the rubber powder modified asphalt with the known mixing amount of 21.35 percent, the viscosity at 180 ℃ of 3.2 Pa.S, the needle penetration of 50(0.1mm), the softening point of 76.4 ℃ and the ductility at 5 ℃ of 16.5 cm. The formula of the product comprises the following components in proportion: 79.10% of matrix asphalt, 0.4% of SBS, 20% of rubber powder and O.5% of stabilizer.
Firstly, preheating the rubber powder modified asphalt to good fluidity at about 160 ℃; dropping the preheated rubber powder modified asphalt on a metal disc. Then the disc is placed in a low-temperature environment of minus 20 ℃ to be cooled for not less than 1 h. After the cooling maintenance is finished, the asphalt on the disc is quickly shoveled by a shovel.
2.0124g (M) of rubber powder modified asphalt with the rubber powder mixing amount of 20 percent is weighed and recorded as M1. Putting the mixture into a 250ml conical flask, weighing xylene which is 40 times of the mass of the rubber powder modified asphalt, and pouring the xylene into the conical flask. The asphalt in the center of the bottom of the bottle is dispersed to the periphery of the bottom of the bottle by stirring with a glass rod in advance. Then put into a rotor to be magnetically stirred for 15 min.
Cutting a circular nylon screen mesh in the stirring process and weighing the mass of the circular nylon screen mesh, wherein the mass is M30＝1.5861g，M40＝1.7347g，M50＝1.7584g，M60＝1.9154g，M80＝0.6533g，M100＝0.4666g，M120＝0.6304g，M160＝0.7427g，M200＝0.8206g。
The solution in the conical flask is divided after the stirring is finishedThe mixture is filtered by nylon screens of 30 meshes, 40 meshes, 50 meshes, 60 meshes, 80 meshes, 100 meshes, 120 meshes, 160 meshes and 200 meshes. When filtered through a 30 mesh screen, the flask was rinsed with xylene until the xylene was colorless. During filtering of each layer of the screen mesh, a pressure spraying kettle containing a dimethylbenzene solvent is used for washing residues on the screen mesh while stirring the residues by using a glass piece until dimethylbenzene dripping liquid is colorless. After the completion, screens with different meshes are placed on a metal disc, and the metal disc is placed in an air-blast dysphoria box at the temperature of 80 ℃ for drying for 1 hour. Cooling in a drying oven for 30min after drying, and weighing the mass M of the screen mesh30′＝1.7124g，M40′＝1.7751g，M50′＝1.7835g，M60′＝1.9534g，M80′＝0.6699g，M100′＝0.4831，M120′＝0.6566g，M160′＝0.7643，M200′＝0.8206。
Mass sum M of residues on each mesh sieveRubber powder＝0.3107g；
The dissolution rate Y (2.0124 × 20% -0.3107)/2.0124 × 20% ═ 0.2280;
namely, the dissolution rate was 22.80%.
Example 2
According to the data obtained in example 1, the crumb rubber particle size distribution in the crumb rubber modified asphalt was calculated according to the following formula,
the particle size distribution of the rubber powder smaller than 30 meshes is (M)30′-M30)/MRubber powder×100％＝0.1263/0.3107＝40.61％
Particle size distribution of 30 mesh rubber powder (M)40′-M40)/MRubber powder×100％＝0.0404/0.3107＝13.00％；
Particle size distribution (M) of 40 mesh rubber powder50′-M50)/MRubber powder×100％＝＝0.0251/0.3107＝8.08％；
Particle size distribution (M) of 50 mesh rubber powder60′-M60)/MRubber powder×100％＝0.0380/0.3107＝12.23％；
Particle size distribution (M) of 60 mesh rubber powder80′-M80)/MRubber powder×100％＝0.0166/0.3107＝5.34％；
Particle size distribution (M) of 80 mesh rubber powder100′-M100)/MRubber powder×100％＝0.0165/0.3107＝5.31％；
Particle size distribution (M) of 100 mesh rubber powder120′-M120)/MRubber powder×100％＝0.0262/0.3107＝8.43％；
Particle size distribution (M) of 120 mesh rubber powder160′-M160)/MRubber powder×100％＝0.0216/0.3107＝6.95％；
Particle size distribution (M) of 160-mesh rubber powder200′-M200)/MRubber powder×100％＝0/0.3107＝0％。
Example 3
According to the method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt, provided by the invention, the dissolution rate and the particle size distribution of the rubber powder in a 5% mixing amount of rubber powder modified asphalt sample are detected, and the result is shown in table 1. Wherein the formula of the product comprises the following components in proportion: 94.10% of matrix asphalt, 0.4% of SBS, 5% of rubber powder and 0.5% of stabilizer.
The rubber powder asphalt has the indexes of: viscosity at 180 ℃ of 0.5 Pa.S, penetration of 66(0.1mm), softening point of 59 ℃ and ductility at 5 ℃ of 6.2 cm.
Table 15% dissolution rate and particle size distribution of crumb rubber in crumb rubber modified asphalt samples
Example 4
According to the method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt, provided by the invention, the dissolution rate and the particle size distribution of the rubber powder in a 10% mixed quantity rubber powder modified asphalt sample are detected, and the result is shown in table 2. Wherein the formula of the product comprises the following components in proportion: 89.10% of matrix asphalt, 0.4% of SBS, 10% of rubber powder and 0.5% of stabilizer. The rubber powder asphalt has the indexes of: viscosity at 180 ℃ of 0.6 Pa.S, penetration of 63(0.1mm), softening point of 69 ℃ and ductility at 5 ℃ of 6.8 cm.
Table 210% rubber powder modified asphalt sample rubber powder dissolution rate and particle size distribution
Example 5
According to the method for detecting the dissolution rate and the particle size distribution of the rubber powder in the rubber powder modified asphalt, provided by the invention, the dissolution rate and the particle size distribution of the rubber powder in a 15% mixed quantity rubber powder modified asphalt sample are detected, and the result is shown in table 3. Wherein the formula of the product comprises the following components in proportion: 84.10% of matrix asphalt, 0.4% of SBS, 15% of rubber powder and 0.5% of stabilizer. The rubber powder asphalt has the indexes of: viscosity at 180 ℃ of 1.3 Pa.S, penetration 52(0.1mm), softening point of 73 ℃ and ductility at 5 ℃ of 1.3 cm.
Table 315% rubber powder modified asphalt sample rubber powder dissolution rate and particle size distribution
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various changes may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are included in the protective scope of the present invention.
It should be noted that, in the foregoing embodiments, various specific technical features and steps described in the above embodiments can be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations of the features and steps are not described separately.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A method for detecting the dissolution rate of rubber powder in rubber powder modified asphalt is characterized by comprising the following steps:
(1) pretreatment:
preheating the rubber powder modified asphalt at 160 ℃ for 1.5-3 h, dropping the rubber powder modified asphalt on a metal disc by using a glass rod to form particles, immediately placing the metal disc in a freezer at-20 ℃ for cooling for more than or equal to 1h, and after cooling, shoveling the asphalt on the disc by using a shovel for later use;
(2) weighing and dispersing:
weighing 2g +/-0.2 g of pretreated rubber powder modified asphalt with the known rubber powder mixing amount of X percent, and recording as M; adding dimethylbenzene into the weighed rubber powder modified asphalt, and stirring for 10-25 min for dispersing to obtain a dispersion liquid;
(3) and (3) filtering:
weighing regular 30, 40, 50, 60, 80, 100, 120, 160, 200 mesh sieves with same size, and recording as M30、M40、M50、M60、M80、M100、M120、M160、M200；
Filtering the dispersion solution with 30, 40, 50, 60, 80, 100, 120, 160 and 200 mesh sieves in sequence;
(4) drying and weighing:
the filtered mesh was dried, cooled, weighed and recorded as M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200′；
(5) And (3) calculating:
the dissolution rate Y of the rubber powder in the rubber powder modified asphalt is calculated according to the following formula,
Y＝(M×X％-Mrubber powder)/(M×X％)；
Wherein, M is the mass of the rubber powder modified asphalt sample;
x percent is the mixing amount of the rubber powder in the rubber powder modified asphalt formula;
Mrubber powderIs the sum of the masses of the residues on the screens of various meshes, i.e. MRubber powder＝(M30′-M30)+(M40′-M40)+(M50′-M50)+(M60′-M60)+(M80′-M80)+(M100′-M100)+(M120′-M120)+(M160′-M160)+(M200′-M200)。
2. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: in the step (1), the rubber powder modified asphalt is preheated to have good fluidity.
3. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: the size of the particles formed by dropping the glass rods on the metal disc in the step (1) is less than or equal to 5 mm.
4. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: the amount of the dimethylbenzene added in the step (2) is 40 times of the mass of the rubber powder modified asphalt.
5. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: and (4) when each screen is used for filtering in the step (3), washing residues on the screen by using a pressure spraying kettle containing a dimethylbenzene solvent while stirring by using a glass piece until the dimethylbenzene dripping liquid is colorless.
6. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: the screen in the step (3) is a nylon screen.
7. The method for detecting the dissolution rate of the rubber powder in the rubber powder modified asphalt as claimed in claim 1, which is characterized in that: placing the screen mesh in an air-blowing dysphoria box at 80 ℃ for drying for 1h in the step (4); and after drying, putting the mixture into a drying oven to be cooled for 10 min.
8. A method for detecting the particle size distribution of rubber powder in rubber powder modified asphalt is characterized by comprising the following steps:
the rubber powder modified asphalt is treated according to the steps (1) to (4) in the claim 1 to obtain M30、M40、M50、M60、M80、M100、M120、M160、M200、M30′、M40′、M50′、M60′、M80′、M100′、M120′、M160′、M200' and MRubber powder；
The rubber powder particle size distribution in the rubber powder modified asphalt is calculated according to the following formula,
the particle size distribution of the rubber powder smaller than 30 meshes is (M)30′-M30)/MRubber powder×100％；
Particle size distribution of 30 mesh rubber powder (M)40′-M40)/MRubber powder×100％；
Particle size distribution (M) of 40 mesh rubber powder50′-M50)/MRubber powder×100％；
Particle size distribution (M) of 50 mesh rubber powder60′-M60)/MRubber powder×100％；
Particle size distribution (M) of 60 mesh rubber powder80′-M80)/MRubber powder×100％；
Particle size distribution (M) of 80 mesh rubber powder100′-M100)/MRubber powder×100％；
Particle size distribution (M) of 100 mesh rubber powder120′-M120)/MRubber powder×100％；
Particle size distribution (M) of 120 mesh rubber powder160′-M160)/MRubber powder×100％
Particle size distribution (M) of 160-mesh rubber powder200′-M200)/MRubber powder×100％。
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