CN108362612B - Method and equipment for measuring true viscosity of rubber asphalt - Google Patents
Method and equipment for measuring true viscosity of rubber asphalt Download PDFInfo
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- CN108362612B CN108362612B CN201810416467.2A CN201810416467A CN108362612B CN 108362612 B CN108362612 B CN 108362612B CN 201810416467 A CN201810416467 A CN 201810416467A CN 108362612 B CN108362612 B CN 108362612B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000010920 waste tyre Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 239000011387 rubberized asphalt concrete Substances 0.000 claims 2
- 239000011159 matrix material Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Road Paving Machines (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a device for measuring the true viscosity of rubber asphalt, wherein a plurality of heating rods are arranged in the side wall of a shell, an ellipsoidal metal shell is arranged in the shell, an ellipsoidal filter screen is positioned in the ellipsoidal metal shell, a wide-thread rotor is arranged in the ellipsoidal filter screen, the bottom of the ellipsoidal metal shell is connected with a drainage tube, and a transmission belt is arranged on the ellipsoidal metal shell around the wide-thread rotor; the invention also provides a method for measuring the true viscosity of the rubber asphalt. The rubber asphalt filtering equipment provided by the invention is simple in operation, intelligent and convenient, can filter molten rubber asphalt through a 200-mesh sieve, can convey filtered waste tire rubber powder out of the equipment, can also preserve heat, ensures that the performance of the rubber asphalt is not changed, and saves heat preservation time for a subsequent viscosity test; the test of the filtered rubber asphalt by adopting 5 different rotational speeds is compared with the test of only one rotational speed, so that the accuracy of the test is obviously improved, and the error is reduced.
Description
Technical Field
The invention belongs to the technical field of road building materials, and in particular relates to a method and equipment for measuring the true viscosity of rubber asphalt.
Background
The modified asphalt cement produced by the fusion reaction of the waste tire rubber powder with the common matrix asphalt under certain conditions has good road performance and special effects on solving the solid pollution of the waste tire, saving energy and protecting environment, plays an important role in various asphalt modification methods, and is rapidly popularized and applied in China in recent years.
The waste tyre rubber powder is mixed with matrix asphalt to raise the viscosity of asphalt obviously and improve the shearing resistance and elastic restoring capacity of the cementing material. The viscosity index is the most important index for evaluating the rubber asphalt, and can directly reflect the service performance and construction operability of the rubber asphalt. The current representative viscosity test method at home and abroad comprises the following steps:
(1) Test methods (ASTM D2196-99) for determining rheological properties of non-Newtonian materials using a rotary (Brookfield) viscometer;
(2) Standard methods for determining viscosity using a rotational viscometer (AASHTO TP 48-97);
(3) And a method of measuring the viscosity of a non-filled asphalt by a Brookfield viscometer (ASTM D4402).
The viscosity test is basically a method based on the Brookfield viscosity, and is suitable for testing the viscosity of matrix asphalt and polymer modified asphalt in a certain range, however, the viscosity of rubber asphalt tested by the traditional method is insufficient and mainly represented by the following steps:
(1) The fineness of the road used waste tire rubber powder is 30-80 meshes, the waste tire rubber powder particles expand after swelling reaction with asphalt, when the molten state rubber asphalt is placed in a sample containing cylinder of a Brookfield viscometer with limited space for testing, the friction force of the cementing material to a rotor is uneven, the viscosity is higher when the waste tire rubber powder around the rotor is more, the viscosity is lower when the rubber powder is less, the testing result is uneven, and the situation that the false viscosity appears is common;
(2) The viscosity data adopts data directly read by an SC4-27 rotor and 20r/min as a viscosity value, the difference between the viscosity data reading method and the viscosity of the actual rubber asphalt is large, and the viscosity of the rubber asphalt cannot be expressed truly and accurately.
Disclosure of Invention
In order to overcome the false viscosity in the rubber asphalt testing process and enable the testing result to be more accurate and reliable, the invention provides equipment for measuring the true viscosity of the rubber asphalt; comprises a bracket, supporting legs, a drawable bottom plate, a drainage tube, an ellipsoidal filter screen, a metal shell, a wide thread rotor and a heating rod; the device comprises a transmission belt, a discarding port, a cover, a temperature control and digital display area, a temperature control switch, a main switch, a forward and reverse rotation switch, a rotation speed regulator, a temperature sensor and a motor, wherein supporting legs are arranged at four corners below a bracket, a shell is arranged at the left part of the bracket, a plurality of heating rods are arranged in the side wall of the shell, an ellipsoidal metal shell is arranged in the shell, an ellipsoidal filter screen is positioned in the ellipsoidal metal shell, a wide thread rotor is arranged in the ellipsoidal filter screen, the wide thread rotor comprises a rotating shaft and a spiral blade, the rotating shaft and the spiral blade are arranged on the central line of the ellipsoidal metal shell, the spiral blade is spirally arranged on the rotating shaft in a rotating mode, and a gap is formed between the outer peripheral surface of the spiral blade and the ellipsoidal filter screen; the bottom of the ellipsoidal metal shell is connected with a drainage tube, and the upper part of the ellipsoidal metal shell is fixedly connected with the shell; a transmission belt is arranged on the ellipsoidal metal shell around the wide-thread rotor, and extends backwards to the material discarding port; a temperature sensor is arranged in the shell, and a cover is arranged on the wide-thread rotor; the right part of the bracket is provided with a temperature control and digital display area, a temperature control switch, a main switch, a forward and reverse rotation switch and a rotating speed regulator.
Preferably, the temperature is adjustable in the range of room temperature to 250 ℃.
Preferably, the mesh number of the ellipsoidal filter is 200 mesh.
Preferably, a drawable bottom plate is arranged below the ellipsoidal metal shell.
The invention also discloses a method for measuring the true viscosity of the rubber asphalt, which comprises the following steps:
(1) Rubber asphalt filtration
Filtering molten rubber asphalt by using the device according to any one of claims 1-4, turning on a main power switch, turning on a temperature control switch, adjusting the temperature, opening a top cover to add the rubber asphalt into a filtering device for filtering after the temperature reaches a set requirement, adjusting a rotating speed regulator to start a rotor when more filtered waste tire rubber powder is left on a filter screen, transmitting the waste tire rubber powder by threads, conveying the waste tire rubber powder to a waste material outlet by a conveying belt, and draining the filtered rubber asphalt to a storage container by a drainage tube;
(2) Rubber asphalt viscosity test
The filtered rubber asphalt is tested for viscosity by using a rotary (Brookfield) viscometer at 180 ℃, and the process is as follows:
1) Placing the sample holding cylinder, the SC4-27 rotor and the pull rod in an environment of 180 ℃ for heat preservation for at least 30min, and simultaneously opening a Brookfield viscosimeter to set temperature for heat preservation;
2) Filling the filtered rubber asphalt into a sample containing cylinder according to the required mass, and placing the rubber asphalt into a Brookfield viscometer for heat preservation for at least 20min;
3) Testing the viscosity of the rubber asphalt with heat preservation meeting the requirement by adopting an SC4-27 rotor and 5 different rotating speeds, and recording the viscosity and torque at the different rotating speeds;
(3) Rubber asphalt viscosity calculation
The viscosity and the torque of the 5 kinds of rubber asphalt obtained according to different rotating speed tests are put in a coordinate axis by taking the abscissa as the torque and the ordinate as the viscosity, and regression is carried out by the following exponential function:
y＝a·e bx
wherein: a-a non-negative constant;
b-a non-positive constant;
x-torque;
y-viscosity;
e is a mathematical constant, the value of which is 2.71828;
and then calculating the corresponding 50% torque according to the regression torque-viscosity relationship, namely the viscosity of the rubber asphalt.
The rubber asphalt filtering equipment provided by the invention is simple in operation, intelligent and convenient, can filter molten rubber asphalt through a 200-mesh sieve, can convey filtered waste tire rubber powder out of the equipment, can also preserve heat, ensures that the performance of the rubber asphalt is not changed, saves heat preservation time for a subsequent viscosity test, and has extremely strong practicability; the filtered rubber asphalt is tested at 5 different rotational speeds, so that the accuracy of the test is obviously improved, errors are reduced, the occurrence of false viscosity is avoided, and the reliability of data is ensured from the source; the accuracy and reliability of the data are more scientifically ensured by adopting an exponential regression and 50% torque calculation method. The viscosity, which is an important index capable of reflecting the performance quality of the rubber asphalt, can be truly and effectively controlled through the whole series of processes, and the booster rubber asphalt technology is greatly developed. The scientific application of the rubber asphalt technology can not only improve the reliability (bearing capacity and service life) of asphalt pavement structures and materials, the durability (high-temperature performance, water stability performance and crack resistance) of pavement service performance, and the comfort (low running soft driving noise and high safety of friction coefficient) of drivers and passengers; the method can also realize the large-scale application of the waste tire resources in highway engineering, has special effects in the aspects of solving the solid pollution of the waste tires, saving energy, protecting the environment and the like, and achieves the situation of multiple win-win technical, economic and environmental benefits.
Drawings
The following is further described in conjunction with the accompanying drawings and detailed description:
FIG. 1 is a schematic structural view of the apparatus for measuring the true viscosity of rubber asphalt according to the present invention.
FIG. 2 is a schematic diagram of the structure of a conveyor belt of the apparatus for measuring the true viscosity of rubber asphalt according to the present invention.
Detailed Description
As shown in fig. 1 and 2, the invention discloses a device for measuring the true viscosity of rubber asphalt, which comprises a bracket 18, a supporting leg 17, a drawable bottom plate 1, a drainage tube 2, a 200-mesh filter screen 3, a metal shell 4, a wide-thread rotor 5, a heating rod 6, a transmission belt 7, a material discarding port 8, a cover 9, a temperature control and digital display area 10, a temperature control switch 11, a main switch 12, a positive and negative rotation switch 13, a rotation speed regulator 14, a temperature sensor 15 and a motor 16, wherein the supporting leg 17 is arranged at four corners below the bracket 18, the left part of the bracket 18 is provided with a shell 19, a plurality of heating rods 6 are arranged in the side wall of the shell 19, an ellipsoidal metal shell 4 is arranged in the shell 19, the ellipsoidal filter screen 3 is positioned at the inner center of the ellipsoidal metal shell 4, the wide-thread rotor 5 is arranged in the ellipsoidal filter screen 3, the wide-thread rotor 5 comprises a rotating shaft and spiral blades positioned on the central line of the ellipsoidal metal shell, the spiral blades are spirally rotated on the rotating shaft, the outer peripheral surfaces of the spiral blades and the blades are in a shape and the shape of the ellipsoidal filter screen 3, and gaps are slightly reserved between the outer peripheral surfaces of the spiral blades and the ellipsoidal filter screen 3; the bottom of the ellipsoidal metal shell 4 is connected with a drainage tube 2, the upper part of the ellipsoidal metal shell 4 is fixedly connected with a shell 19, a transmission belt 7 is arranged on the ellipsoidal metal shell 4 around the wide-thread rotor 5, and the transmission belt 7 extends to the rear part to a waste port 8; a temperature sensor 9 is arranged in the shell, and a cover 9 is arranged on the wide thread rotor 5; the right part of the bracket is provided with a temperature control and digital display area 10, a temperature control switch 11, a main switch 12, a forward and reverse rotation switch 13 and a rotation speed regulator 14.
The feed may be assisted by counter-rotating a wide screw rotor.
The mesh number of the ellipsoidal filter screen is 200 meshes.
The invention also provides a method for measuring the true viscosity of the rubber asphalt, which comprises the following steps:
1. and (3) filtering rubber asphalt:
the molten rubber asphalt is filtered by the equipment of the invention, and the equipment mainly comprises a temperature control device, a filtering device, a rotating device, a filtering rubber powder transmission device and the like. The temperature control device comprises a heating rod 6, a temperature sensor 15, a temperature setting and digital display area interface 10 and a temperature control switch 11, and the temperature adjustable range is room temperature to 250 ℃. The filtering device comprises a drainage tube 2, a 200-mesh ellipsoidal filter screen 3, an ellipsoidal metal shell 4 and a cover 9. The rotating device comprises a wide thread rotor 5, a forward and reverse rotation switch 13 and a rotating speed regulator 14. The filter rubber powder conveying device comprises a conveying belt 7 and a discarding port 8.
When the rubber asphalt storage device is used, the main power switch 12 is turned on, the temperature control switch 11 is turned on, the temperature control and digital display area 10 is regulated, the top cover 9 is turned on to add rubber asphalt into the filtering device for filtering after the temperature reaches the set requirement, the rotating speed regulator is regulated to start the rotor when more filtered waste tire rubber powder is left on the filter screen, the waste tire rubber powder is transmitted by threads, the waste tire rubber powder is conveyed to the waste material outlet through the conveying belt, and the filtered rubber asphalt is drained into the storage container through the drainage tube 2.
2. Rubber asphalt viscosity test:
the filtered rubber asphalt is tested for viscosity by using a rotary (Brookfield) viscometer at 180 ℃, and the process is as follows:
(1) Placing the sample holding cylinder, the SC4-27 rotor and the pull rod in an environment of 180 ℃ for heat preservation for at least 30min, and simultaneously opening a Brookfield viscosimeter to set temperature for heat preservation;
(2) Filling the filtered rubber asphalt into a sample holding cylinder according to the required mass, and placing the rubber asphalt into a Brookfield viscosimeter for heat preservation for at least 20min;
(3) The viscosity of the rubber asphalt meeting the heat preservation requirement is tested by adopting an SC4-27 rotor and 5 different rotating speeds, and the viscosity and the torque at the different rotating speeds are recorded.
3. And (3) calculating the viscosity of the rubber asphalt:
the viscosity and the torque of the 5 kinds of rubber asphalt obtained according to different rotating speed tests are put in a coordinate axis by taking the abscissa as the torque and the ordinate as the viscosity, and regression is carried out by the following exponential function:
y＝a·e bx
wherein: a-a non-negative constant;
b-a non-positive constant;
x-torque;
y-viscosity;
e is a mathematical constant, the value of which is 2.71828.
And then calculating the corresponding 50% torque according to the regression torque-viscosity relationship, namely the viscosity of the rubber asphalt.
By using the device provided by the invention, the false viscosity of the rubber asphalt in the test process can be reduced, the error is reduced, the viscosity value is more accurate and reliable by testing a plurality of viscosities and performing an exponential regression method on data processing, the obtained viscosity value can only reflect the quality condition of the rubber asphalt, the engineering quality construction is ensured, and the development of green and environment-friendly high-grade roads is promoted.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The equipment for measuring the true viscosity of the rubber asphalt is characterized by comprising a bracket, supporting legs, a drawable bottom plate, a drainage tube, an ellipsoidal filter screen, a metal shell, a wide-thread rotor and a heating rod; the novel multifunctional heating device comprises a transmission belt, a discarding port, a cover, a temperature control and digital display area, a temperature control switch, a main switch, a forward and reverse rotation switch, a rotation speed regulator, a temperature sensor and a motor, wherein supporting legs are arranged at four corners below a bracket, a shell is arranged at the left part of the bracket, a plurality of heating rods are arranged in the side wall of the shell, an ellipsoidal metal shell is arranged in the shell, a drawable bottom plate is arranged below the ellipsoidal metal shell, an ellipsoidal filter screen is arranged in the ellipsoidal metal shell, a wide thread rotor is arranged in the ellipsoidal filter screen and comprises a rotating shaft and a spiral blade which are arranged on the central line of the ellipsoidal metal shell, the spiral blade is in a spiral shape and is rotatably arranged on the rotating shaft, and a gap is arranged between the outer peripheral surface of the spiral blade and the ellipsoidal filter screen; the bottom of the ellipsoidal metal shell is connected with a drainage tube, and the upper part of the ellipsoidal metal shell is fixedly connected with the shell; a transmission belt is arranged on the ellipsoidal metal shell around the wide-thread rotor, and extends backwards to the material discarding port; a temperature sensor is arranged in the shell, and a cover is arranged on the wide-thread rotor; the right part of the bracket is provided with a temperature control and digital display area, a temperature control switch, a main switch, a forward and reverse rotation switch and a rotating speed regulator.
2. The apparatus for measuring true viscosity of asphalt rubber according to claim 1, wherein the temperature is adjustable in a range of room temperature to 250 ℃.
3. The apparatus for measuring true viscosity of asphalt rubber according to claim 1, wherein the mesh number of the ellipsoidal filter is 200 mesh.
4. A method for determining the true viscosity of rubber asphalt, comprising the steps of:
(1) Rubber asphalt filtration
Filtering molten rubber asphalt by using the device for measuring the true viscosity of the rubber asphalt according to any one of claims 1-3, turning on a main power switch, turning on a temperature control switch, adjusting the temperature, opening a top cover to add the rubber asphalt into a filtering device for filtering after the temperature reaches a set requirement, adjusting a rotating speed regulator to start a rotor when more filtered waste tire rubber powder is left on a filter screen, transmitting the waste tire rubber powder by threads, conveying the waste tire rubber powder to a waste material outlet by a conveying belt, and draining the filtered rubber asphalt into a storage container by a drainage tube;
(2) Rubber asphalt viscosity test
The filtered rubber asphalt is tested for viscosity by a rotary Brinell viscometer at 180 ℃, and the process is as follows:
1) Placing the sample holding cylinder, the SC4-27 rotor and the pull rod in an environment of 180 ℃ for heat preservation for at least 30min, and simultaneously opening a Brookfield viscometer for setting temperature for heat preservation;
2) Filling the filtered rubber asphalt into a sample holding cylinder according to the required mass, and placing the sample holding cylinder in a Brookfield viscometer for heat preservation for at least 20min;
3) Testing the viscosity of the rubber asphalt with heat preservation meeting the requirement by adopting an SC4-27 rotor and 5 different rotating speeds, and recording the viscosity and torque at the different rotating speeds;
(3) Rubber asphalt viscosity calculation
The viscosity and the torque of the 5 kinds of rubber asphalt obtained according to different rotating speed tests are put in a coordinate axis by taking the abscissa as the torque and the ordinate as the viscosity, and regression is carried out by the following exponential function:
，
wherein: a-a non-negative constant;
b-a non-positive constant;
x-torque;
y-viscosity;
and then calculating the corresponding 50% torque according to the regression torque-viscosity relationship, namely the viscosity of the rubber asphalt.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810416467.2A CN108362612B (en) | 2018-05-03 | 2018-05-03 | Method and equipment for measuring true viscosity of rubber asphalt |
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|---|---|---|---|
| CN201810416467.2A CN108362612B (en) | 2018-05-03 | 2018-05-03 | Method and equipment for measuring true viscosity of rubber asphalt |
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| CN108362612B true CN108362612B (en) | 2023-11-07 |
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| CN111337387B (en) * | 2020-03-23 | 2020-12-08 | 四川省公路规划勘察设计研究院有限公司 | Rubber asphalt viscosity field rapid detection method based on handheld viscometer |
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| CN108362612A (en) | 2018-08-03 |
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