CN107607441B - Experimental device for determining adhesion performance of fibers and asphalt or asphalt cement and application method thereof - Google Patents
Experimental device for determining adhesion performance of fibers and asphalt or asphalt cement and application method thereof Download PDFInfo
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- CN107607441B CN107607441B CN201710966035.4A CN201710966035A CN107607441B CN 107607441 B CN107607441 B CN 107607441B CN 201710966035 A CN201710966035 A CN 201710966035A CN 107607441 B CN107607441 B CN 107607441B
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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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Abstract
The invention relates to an experimental device for determining the adhesion performance of fibers and asphalt or asphalt cement and a use method thereof, wherein the experimental device comprises an experimental platform (1) and a control panel (14), and the experimental platform (1) comprises an environment box, a metal sample container, a fiber holder, an infrared temperature sensor and the like; because the experimental device adopts strain control, the tensile force between the fiber and the asphalt or the asphalt cement is measured every 0.5 seconds, the reliability of data is greatly improved, the real bonding force between the asphalt and the fiber is more similar, the bonding capability of the fiber and the asphalt cement can be evaluated, and people can better select the fiber to modify the asphalt or the asphalt cement.
Description
[ field of technology ]
The invention belongs to the technical field of asphalt and asphalt cement performance detection. More particularly, the invention relates to an experimental device for determining the adhesion performance of fibers to asphalt or asphalt cement, and a use method of the experimental device.
[ background Art ]
The fiber modified asphalt improves the road performance of the asphalt mixture by changing the performance of the asphalt. The current manufacturing method of the fiber modified asphalt comprises a mechanical stirring method, a solvent method, a rubber grinding method or a colloid grinding method. Adding the fiber into the matrix asphalt to prepare fiber modified asphalt, wherein the fiber modifier and the asphalt form a new balance interface through physical action and chemical action to form a new chemical bond, thereby changing the asphalt performance. The new interfaces and adsorption films formed by different fibers and different proportions for asphalt are different, so that the basic properties of the modified asphalt are different, and the interfaces and the adsorption films consist of a plurality of irregular peaks and valleys. At present, the influence of different fiber modified asphalt and different blending amount fibers on the performance of the modified asphalt is judged through penetration experiments, extensibility experiments, softening point experiments, rotational viscosity experiments, asphalt oil absorption experiments, dynamic shear rheology experiments and other experiments in China. The experimental design or specification of the bonding degree of the fiber and the asphalt is not specific, and the adhesion performance between different fibers and the modified asphalt or the modified asphalt cement cannot be obtained as soon as possible due to the large and time-consuming experimental operation amount, a series of environment uncontrollable factors such as the existence time and the temperature exist in the operation process, and the real interface film effect of the interface between the fiber and the asphalt cannot be tested. CN 105181585A discloses a device and a method for testing adhesion performance of fibers and asphalt, but in the method, physical action and chemical action between the fibers and the asphalt are not considered, in this case, it is calculated that the fibers wrapped with the asphalt may contain fibers which have acted with the asphalt, so that the experimental result is not accurate enough, and although the fibers are drawn out at a constant speed, the quality of the asphalt carried on the fibers may be different at different stretching speeds, which has a certain influence on the experimental result.
To this end, the present inventors have completed the present invention through a large number of experiments and analyses based on the summary of the prior art.
[ invention ]
[ problem to be solved ]
The invention aims to provide an experimental device for determining the adhesion performance of fibers and asphalt or asphalt cement.
It is another object of the present invention to provide a method of using the experimental set-up for determining the adhesion properties of fibers to asphalt or asphalt cement.
Technical scheme
The invention is realized by the following technical scheme.
The invention relates to an experimental device for measuring the adhesion performance of fibers and asphalt or asphalt cement, which comprises an experimental platform 1 and a control panel 14, and is characterized in that the experimental platform 1 comprises an environment box 2, a constant-temperature heating resistance wire 3, a metal sample vessel 4, a fixed support 6, a cross beam 7, a fiber holder No. 18, a fiber holder No. 2 9, a fiber holder No. 3 10, an infrared temperature sensor 12 and a support 13; the control panel 14 includes a display 15, a device switch button 16, a temperature rotation button 17, an up button 18, a print button 19, a down button 20, a printing device 21, and a power device-motor 25;
an environment box 2 is arranged on the experiment platform 1, a fixed bracket 6 is arranged in the environment box 2, the lower end of the fixed bracket is fixed on the experiment platform 1, and the upper end of the fixed bracket is connected with the experiment platform 1 into a whole through a cross beam 7; a constant temperature heating resistance wire 3 is arranged at the bottom of the environment box 2 in a fixed bracket 6; placing a bracket 13 above the constant temperature heating resistance wire 3, and placing a metal sample container 4 above the bracket 13;
the beam 7 is provided with a fiber holder No. 18, a fiber holder No. 2 9, a fiber holder No. 3 10 and an infrared temperature sensor 12; the infrared temperature sensor 12 is connected with the display screen 15 through a wire, and the fiber holder No. 18, the fiber holder No. 2 9 and the fiber holder No. 3 10 are connected with the up button 18 and the down button 20 through wires; the information collected by the force sensor 26 of the fiber holders is converted by the controller 27 and then displayed on the display screen 15;
the data displayed on the display screen 15 is sent to the printing device 21 for printing through the printing button 19; the overall experimental setup power is controlled by the setup switch button 16.
According to another preferred embodiment of the invention, the environmental chamber 2 is made of a high temperature resistant glass plate, which can be opened and closed on the side facing the control panel 14.
According to another preferred embodiment of the present invention, the thermostatic heating resistance wire 3 adjusts the heating power by the temperature rotation knob 17 while detecting the temperature of the metal cuvette 4 heated by the thermostatic heating resistance wire 3 by the infrared temperature sensor 12, and transmits the detected temperature signal to the display 15 and displays the temperature thereof.
According to another preferred embodiment of the invention, the up button 18 controls the simultaneous raising of fiber holder No. 18, fiber holder No. 2 9 and fiber holder No. 3 10 at a speed below 10 mm/min.
According to another preferred embodiment of the present invention, the descent button 20 is provided with a first vacancy, a second vacancy and a third vacancy, which in turn control the fiber holder No. 18, the fiber holder No. 2 9 and the fiber holder No. 3 10, respectively, to descend at a certain speed.
According to another preferred embodiment of the present invention, the metal cuvette 4 is equally divided into a first cell 4-1, a second cell 4-2 and a third cell 4-3, and graduation marks 5, a fiber holder No. 17, a fiber holder No. 28 and a fiber holder No. 3 9 are provided in the metal cuvette 4 at 2/3 of its height, corresponding to the first cell 4-1, the second cell 4-2 and the third cell 4-3, respectively, and perpendicular to the bottom of the metal cuvette 4.
According to another preferred embodiment of the invention, the display 14 displays the results of the asphalt or asphalt cement temperature, ambient box temperature, preset temperature, loading rate, stress and fiber-asphalt action film strength Si test measured every 0.5 seconds for each fiber holder.
According to another preferred embodiment of the invention, the fibres are inorganic fibres or organic fibres, the inorganic fibres being selected from the group consisting of basalt fibres, glass fibres and asbestos fibres; the organic fiber is selected from polyester fiber or polyacrylonitrile fiber.
The invention also relates to a using method of the experimental device.
The using method of the experimental device comprises the following steps:
A. preparation of experiments
Heating asphalt or asphalt cement to a molten state in an oven, and vertically and downwards clamping fibers on a fiber holder No. 17, a fiber holder No. 28 and a fiber holder No. 3 respectively, so that the lower ends of the fibers are positioned in a metal sample container 4 and are vertical to the bottom of the metal sample container 4;
B. forming a fiber-asphalt action film
C, starting a temperature rotating button 16 to heat the environment box 2, pouring the molten asphalt or asphalt cement in the step A into the metal sample container 4 until the molten asphalt or asphalt cement reaches the scale marks 5, and standing for 15-18 min to enable the asphalt or asphalt cement to fully react with the fibers to form a firm fiber-asphalt action film;
C. testing
The up button 17 is activated to lift the fibers immersed in the asphalt or asphalt cement at a speed lower than 10mm/min, and the corresponding measured stress value every 0.5 seconds is read by the display 14, and the fiber-asphalt action film strength S of the fibers 1 to 3 is calculated by the following formula i ：
Fibre-bitumen action film Strength S i Stress sigma i X speed V
Wherein:
i＝1-3；
tension F i Recording the average value of the maximum pulling force of three times in the experimental process, wherein the unit is N;
area S is the area of contact of the fibers with the asphalt or asphalt cement, in mm 2 ；
Diameter D is the diameter of the fiber in mm;
stress sigma i Unit Pa;
intensity S i Unit Pa mm/min;
the speed V is the lifting speed of the fiber, and the unit is mm/min;
the fiber-bitumen action film strength S of this fiber is calculated from the following formula:
strength of fiber-asphalt-acting film s= (strength of No. 1 fiber-asphalt-acting film S 1 +2 fiber-bitumen action film Strength S 2 +3 fiber-bitumen action film Strength S 3 )/3。
The present invention will be described in more detail below.
The invention relates to an experimental device for measuring the adhesion performance of fibers and asphalt or asphalt cement, which comprises an experimental platform 1 and a control panel 14, wherein the experimental platform 1 comprises an environment box 2, a constant-temperature heating resistance wire 3, a metal sample vessel 4, a fixed support 6, a cross beam 7, a No. 1 fiber holder 8, a No. 2 fiber holder 9, a No. 3 fiber holder 10, an infrared temperature sensor 12 and a support 13; the control panel 14 includes a display 15, a device switch button 16, a temperature rotation button 17, an up button 18, a print button 19, a down button 20, a printing device 21, and a power device-motor 25; see fig. 1 for a specific structure.
An environment box 2 is arranged on the experiment platform 1, a fixed bracket 6 is arranged in the environment box 2, the lower end of the fixed bracket is fixed on the experiment platform 1, and the upper end of the fixed bracket is connected with the experiment platform 1 into a whole through a cross beam 7; a constant temperature heating resistance wire 3 is arranged at the bottom of the environment box 2 in a fixed bracket 6; placing a bracket 13 above the constant temperature heating resistance wire 3, and placing a metal sample container 4 above the bracket 13;
the environmental chamber 2 used in the present invention is made of a high temperature resistant glass plate which can be opened and closed on the side facing the control panel 13. The high temperature resistant glass plate is a glass plate which can bear the temperature of-50 to 350 ℃ and has the thickness of 2 to 5 mm. The high temperature resistant glass sheet used in the present invention is a product currently on the market, for example, a high temperature resistant glass sheet sold under the trade name of 350 ℃ high temperature resistant glass by the company of Yiweite glass Co., ltd.
The environmental chamber 2 used in the present invention can be opened and closed by a glass plate on the side facing the control panel 14 so that a worker can perform the related operations conveniently.
In the invention, two groups of fixing brackets 6 are arranged near two side walls of an environment box 2, the lower ends of the fixing brackets are fixed on an experiment platform 1, and the upper ends of the fixing brackets are connected into a whole through a cross beam 7.
The fixing bracket 6 and the cross beam 7 of the invention are both made of stainless steel materials.
A No. 1 fiber holder 8, a No. 2 fiber holder 9, a No. 3 fiber holder 10 and an infrared temperature sensor 12 are arranged on the cross beam 7; referring specifically to fig. 1.
The fiber holder is a clamp or a tubular fiber holder 22 capable of detecting the stress of the fiber and firmly clamping the fiber, the tubular fiber holder 22 is composed of a fiber holding tube 23 and a flat head screw 24, the fiber is placed in the fiber holding tube 23, and the fiber can be firmly fixed on the fiber holding tube by screwing the flat head screw 24, so that the lowest stress value of the detected fiber is not lower than 5000MPa. The fiber holder used in the invention is controlled by a force sensor 26, one end of the force sensor 26 is connected with a clamp or a fiber holding pipe 23 of the fiber holder and a fiber contact area, the other end of the force sensor 26 is connected with a power device-motor 25, and information acquired by the force sensor 26 is displayed on a display screen 15 after being converted by a controller 27. The force sensor 26 used in the present invention is a U9C miniature force sensor sold by HBM corporation, with specific structure shown in FIG. 4.
Fiber holder No. 18, fiber holder No. 2 9 and fiber holder No. 3 10 are connected with up button 18 and down button 20 on installation control panel 14 by wires;
when the up button 18 is activated, the power-motor 25 drives the fiber holder No. 18, fiber holder No. 2 9 and fiber holder No. 3 10 to simultaneously rise at a speed of less than 10mm/min via the wire.
The lowering button 20 is provided with a first space, a second space and a third space, which control the fiber holder No. 18, the fiber holder No. 2 9 and the fiber holder No. 3, respectively, in order to lower them at a certain speed. When the lowering button 20 is placed in the first empty position, the power unit-motor 25 drives the fiber holder No. 18 to lower at a certain speed through the wire, while the fiber holders No. 2 and No. 3, 10, do not move. When the lowering button 20 is placed in the second empty position, the power device-motor 25 drives the fiber holder No. 28 to lower at a certain speed through the wire, while the fiber holders No. 1, 9 and No. 3, 10 do not move, and so on.
The infrared temperature sensor 12 is connected with the display screen 15 through a wire. The constant temperature heating resistance wire 3 adjusts heating power through a temperature rotating knob 17 on the control panel 14, and simultaneously detects the temperature of the metal cuvette 4 heated by the constant temperature heating resistance wire 3 by using the infrared temperature sensor 12, and transmits the detected temperature signal to the display screen 15 and displays the temperature thereof.
The temperature detection and display technology related to the present invention is a conventional technology, and will not be described in detail herein.
In the present invention, the structure of the constant temperature heating resistance wire 3 is shown in fig. 2. The constant temperature heating resistance wire 3 used in the invention is a product sold in the market at present, the application voltage of the constant temperature heating resistance wire 3 is 220-380V, and the power is 500-1000W.
In the invention, a bracket 13 is placed above the constant temperature heating resistance wire 3, and a metal sample vessel 4 is placed on the bracket 13.
The bracket 12 is made of stainless steel material; a schematic of the structure of the bracket 12 is shown in fig. 3.
The metal sample vessel 4 is used for containing molten asphalt or asphalt cement, and is made of stainless steel metal materials.
The metal sample container 4 is equally divided into a first tank 4-1, a second tank 4-2 and a third tank 4-3, and scale marks 5, a fiber holder 8 No. 1, a fiber holder 9 No. 2 and a fiber holder 10 No. 3 are arranged at the two thirds height of the metal sample container 4, respectively correspond to the first tank 4-1, the second tank 4-2 and the third tank 4-3, and are vertical to the bottom of the metal sample container 4.
The data displayed on the display screen 15 is sent to the printing device 21 for printing through the printing button 19; the overall experimental setup power is controlled by the setup switch button 16.
The display 15 used in the present invention is a product currently marketed, for example, by Ningbo co-located liquid crystal display technology Co., ltd under the trade name OLED liquid crystal display 0.96 double yellow electronic display.
The display 15 displays the asphalt or asphalt cement temperature, ambient box temperature, preset temperature, loading speed, and the results of the stress and fiber-asphalt action film strength Si test measured every 0.5 seconds for each fiber holder.
In the present invention, the display 15, the device switch button 16, the temperature rotation button 17, the up button 18, the print button 19, the print device 21, the down button 20, and their connection and operation modes on the control panel 14 are commonly used or conventional in the art.
The power plant motor 25 used in the invention is an M5120-402 single-phase asynchronous motor manufactured by Dimensions of Tianli motor Limited in Leqing.
In the invention, the fiber is an inorganic fiber or an organic fiber for processing asphalt or asphalt cement, wherein the inorganic fiber is selected from the inorganic fiber and the basalt fiber, the glass fiber and the asbestos fiber; the organic fiber is selected from polyester fiber and polyacrylonitrile fiber. These fibers are all products currently marketed, for example, basalt fiber inorganic fiber products sold under the trade name basalt fiber by Jiangsu Kang Dafu New Material technology Co., ltd; such as polyacrylonitrile organic fiber products sold under the trade name polyacrylonitrile by the company Hebei Runban fire protection materials.
The invention also relates to a method for using the experimental device for determining the adhesion performance of the fiber and the asphalt or asphalt cement.
The using method of the experimental device comprises the following steps:
A. preparation of experiments
Heating asphalt or asphalt cement to a molten state in an oven, and vertically and downwards clamping fibers on a fiber holder No. 18, a fiber holder No. 2 9 and a fiber holder No. 3 respectively, so that the lower ends of the fibers are positioned in a metal sample container 4 and are vertical to the bottom of the metal sample container 4;
B. forming a fiber-asphalt action film
C, starting a temperature rotating button 17 to heat the environment box 2, pouring the molten asphalt or asphalt cement in the step A into the metal sample container 4 until the molten asphalt or asphalt cement reaches the scale marks 5, and standing for 15-18 min to enable the asphalt or asphalt cement to fully react with the fibers to form a firm fiber-asphalt action film;
C. testing
The up button 17 is activated to lift the fibres immersed in the bitumen or bitumen cement simultaneously at a speed lower than 10mm/min, and the corresponding measured force values every 0.5 seconds are read by the display 15, byThe fiber-asphalt action film strength S of the No. 1-3 fibers was calculated as follows i ：
Fibre-bitumen action film Strength S i Stress sigma i X speed V
Wherein:
i＝1-3；
tension F i Recording the average value of the maximum pulling force of three times in the experimental process, wherein the unit is N;
area S is the area of contact of the fibers with the asphalt or asphalt cement, in mm 2 ；
Diameter D is the diameter of the fiber in mm;
stress sigma i Unit Pa;
intensity S i Unit Pa mm/min;
the speed V is the lifting speed of the fiber, and the unit is mm/min;
the fiber-bitumen action film strength S of this fiber is calculated from the following formula:
strength of fiber-asphalt-acting film s= (strength of No. 1 fiber-asphalt-acting film S 1 +2 fiber-bitumen action film Strength S 2 +3 fiber-bitumen action film Strength S 3 )/3。
Because of the different physical and chemical properties of different types of fibers, different physical and chemical effects can occur between the fibers and asphalt or asphalt cement; the amount of physical and chemical effects that may occur under the conditions of different amounts of the same fiber are different. The experimental device for measuring the adhesion performance of the fiber and the asphalt or asphalt cement can measure the adhesion performance of different kinds of fiber and asphalt or asphalt cement and the fiber modified asphalt or modified asphalt cement with the same kind of fiber under different mixing amounts.
[ advantageous effects ]
The beneficial effects of the invention are as follows:
because the experimental device adopts strain control, the tensile force between the fiber and the asphalt or the mucilage is measured every 0.5 seconds, the reliability of data is greatly improved, and the experimental device is closer to the real binding force between the asphalt and the fiber.
The experimental device is used for measuring the adhesion performance between the fiber and the asphalt or asphalt cement, and can evaluate the adhesion capability of the fiber and the asphalt or asphalt cement, so that people can better select the fiber to modify the asphalt or the asphalt cement.
Because the experimental device is simpler, the required materials are less, and the cost is greatly reduced. The data is true and reliable;
because the experimental device is simpler, the operation steps are fewer, the experiment is carried out without professional training and guidance, and the experiment time is short.
[ description of the drawings ]
FIG. 1 is a schematic diagram of the experimental apparatus for determining the adhesion properties of fibers to asphalt or asphalt cement according to the present invention;
FIG. 2 is a schematic diagram of the structure of a constant temperature heating resistance wire 3 of the invention;
fig. 3 is a schematic view of the structure of the bracket 13 of the present invention;
FIG. 4 is a schematic view of the structure of a tubular fiber holder 22 of the present invention;
in the figure:
the device comprises a 1-experiment platform, a 2-environment box, a 3-constant temperature heating resistance wire, a 4-metal sample container, a 4-1-first tank, a 4-2-second tank, a 4-3-third tank, a 5-metal sample container scale line, a 6-fixed support, a 7-cross beam, a 8-1 fiber holder, a 9-2 fiber holder, a 10-3 fiber holder, a 11-fiber, a 12-infrared temperature sensor, a 13-support, a 14-control panel, a 15-display screen, a 16-device switch button, a 17-temperature rotating button, a 18-rising button, a 19-printing button, a 20-falling button, a 21-printing device, a 22-tubular fiber holder, a 23-fiber holding tube, a 24-flat head screw, a 25-power device-motor, a 26-force sensor and a 27-controller.
[ detailed description ] of the invention
The invention will be better understood by the following examples.
Example 1: the experimental device and the method for measuring the strength of the fiber-asphalt acting film
The implementation of this example is as follows:
the experimental device comprises an experimental platform 1 and a control panel 14, wherein the experimental platform 1 comprises an environment box 2, a constant-temperature heating resistance wire 3, a metal sample container 4, a fixed support 6, a cross beam 7, a No. 1 fiber holder 8, a No. 2 fiber holder 9, a No. 3 fiber holder 10, an infrared temperature sensor 12 and a support 13; the control panel 14 includes a display 15, a device switch button 16, a temperature rotation button 17, an up button 18, a print button 19, a down button 20, a printing device 21, and a power device-motor 25;
an environment box 2 made of high-temperature-resistant glass plates is arranged on the experiment platform 1, the glass plate on the side facing the control panel 13 can be opened and closed, a fixed bracket 6 is arranged in the environment box 2, the lower end of the fixed bracket is fixed on the experiment platform 1, and the upper end of the fixed bracket is connected with the experiment platform through a cross beam 7 to form a whole; a constant temperature heating resistance wire 3 is arranged at the bottom of the environment box 2 in a fixed support 5, the constant temperature heating resistance wire 3 adjusts heating power through a temperature rotating button 17, meanwhile, an infrared temperature sensor 12 is utilized to detect the temperature of a metal sample container 4 heated by the constant temperature heating resistance wire 3, and a detected temperature signal is transmitted to a display screen 15 and is displayed;
placing a bracket 13 above the constant temperature heating resistance wire 3, and placing a metal sample container 4 above the bracket 13; the metal sample container 4 is equally divided into a first tank 4-1, a second tank 4-2 and a third tank 4-3;
the beam 7 is provided with a fiber holder No. 18, a fiber holder No. 2 9, a fiber holder No. 3 10 and an infrared temperature sensor 12; the infrared temperature sensor 12 is connected with the display screen 15 through a wire, the fiber holder No. 18, the fiber holder No. 2 9 and the fiber holder No. 3 10 are connected with the up button 18 and the down button 20 through wires, and the fiber holders are vertical to the bottom of the metal sample vessel 4;
the up button 18 controls the fiber holder No. 18, fiber holder No. 2 9 and fiber holder No. 3 10 to simultaneously rise at a speed of 9.8 mm/min; the lowering button 20 is provided with three vacant positions which control the fiber holder No. 18, the fiber holder No. 2 9 and the fiber holder No. 3 10 in this order from left to right so that they are lowered at a speed of 10 mm/min. The information collected by the U9C miniature force sensor 26 sold by HBM company is displayed on the display screen 15 after being converted by the controller 27;
the data displayed on the display screen 15 is sent to the printing device 21 for printing through the printing button 19; the overall experimental setup power is controlled by the setup switch button 16.
The experimental apparatus described in this example was used to measure basalt fiber-bitumen action film strength S as follows:
A. preparation of experiments
Heating asphalt sold by alpha Jiangyin asphalt Co., ltd under the trade name of 70 grade A to a molten state in an oven, and vertically and downwardly clamping basalt fiber sold by Jiangsu Kang Dafu New Material technology Co., ltd under the trade name of basalt fiber with a diameter of 12 μm and a length of 60mm on a fiber holder No. 17, a fiber holder No. 2, a fiber holder No. 8 and a fiber holder No. 3 respectively, so that the lower ends thereof are positioned in a metal sample vessel 4 and are perpendicular to the bottom of the metal sample vessel 4;
B. forming a fiber-asphalt action film
Turning on a temperature rotary knob 16 to heat the environment box 2 to 125 ℃, pouring the molten asphalt in the step A into a metal sample container 4, and standing for 15min to enable the asphalt to fully react with the fibers to form a firm fiber-asphalt action film;
C. testing
The up button 17 is activated to lift the fibres immersed in the bitumen at a speed lower than 9.8mm/min, and the corresponding measured stress values 655MPa, 661MPa and 649MPa, respectively, are read by the display 14 every 0.5 seconds. Then, according to the calculation method described in the present specification, the fiber-asphalt-acting film strength S of the No. 1-3 fibers is calculated from these stress values i 5240MPa mm/min, 5288MPa mm/min and 5192MPa mm/min, respectively, and the film strength S is determined by i The fiber-bitumen action film strength S of this fiber was calculated to be 5240mpa x mm/min.
Example 2: the experimental device and the method for measuring the strength of the fiber-asphalt cement acting film
The embodiment of this example is the same as that of example 1 except that asphalt cement prepared by asphalt sold under the trade name of 70 grade a by alpha river asphalt limited and basalt mineral powder at a powder-cement ratio of 0.587 is used; standing basalt fiber in the molten asphalt cement for 18min, starting a rising button 17, and simultaneously lifting the fiber immersed in asphalt at a speed lower than 9.8 mm/min;
the corresponding measured stress values of 886MPa, 882MPa and 892MPa, respectively, are read by the display 14 every 0.5 seconds. Then, according to the calculation method described in the present specification, the fiber-asphalt-acting film strength S of the No. 1-3 fibers is calculated from these stress values i 7088MPa mm/min, 7056MPa mm/min and 7136MPa mm/min respectively, and the film strength S is determined by i The fiber-bitumen action film strength S of this fiber was calculated to be 7093.3mpa mm/min.
Claims (7)
1. An experimental device for determining the adhesion performance of fibers and asphalt or asphalt cement comprises an experimental platform (1) and a control panel (14), and is characterized in that the experimental platform (1) comprises an environment box (2), a constant-temperature heating resistance wire (3), a metal sample vessel (4), a fixed support (6), a cross beam (7), a fiber holder No. 1 (8), a fiber holder No. 2 (9), a fiber holder No. 3 (10), an infrared temperature sensor (12) and a support (13); the control panel (14) comprises a display screen (15), a device switch button (16), a temperature rotating button (17), an ascending button (18), a printing button (19), a descending button (20), a printing device (21) and a power device-motor (25);
an environment box (2) is arranged on the experiment platform (1), a fixed bracket (6) is arranged in the environment box (2), the lower end of the fixed bracket is fixed on the experiment platform (1), and the upper end of the fixed bracket is connected with the experiment platform (1) into a whole through a cross beam (7); a constant temperature heating resistance wire (3) is arranged at the bottom of the environment box (2) in the fixed bracket (6), and the constant temperature heating resistance wire (3) adjusts heating power through a temperature rotating button (17); placing a bracket (13) above the constant-temperature heating resistance wire (3), and placing a metal sample container (4) on the bracket (13);
a beam (7) is provided with a fiber holder No. 1 (8), a fiber holder No. 2 (9), a fiber holder No. 3 (10) and an infrared temperature sensor (12); the infrared temperature sensor (12) is connected with the display screen (15) through a lead, the temperature of the metal sample container (4) heated by the constant-temperature heating resistance wire (3) is detected by the infrared temperature sensor (12), and a detected temperature signal is transmitted to the display screen (15) and is displayed; the fiber holders 1 (8), 2 (9) and 3 (10) are connected with the ascending button (18) and the descending button (20) through wires; the information collected by the force sensor (26) of the fiber holders is displayed on the display screen (15) after being converted by the controller (27);
the data displayed on the display screen (15) is transmitted to the printing device (21) for printing through the printing button (19); the whole experimental device power supply is controlled by a device switch button (16);
the using method of the experimental device comprises the following steps:
A. preparation of experiments
Heating asphalt or asphalt cement to a molten state in an oven, and vertically and downwards clamping fibers on a No. 1 fiber clamp holder (8), a No. 2 fiber clamp holder (9) and a No. 3 fiber clamp holder (10) respectively, so that the lower ends of the fibers are positioned in a metal sample container (4) and are vertical to the bottom of the metal sample container (4);
B. forming a fiber-asphalt action film
C, starting a temperature rotating button (17) to heat the environment box (2), pouring the molten asphalt or asphalt cement in the step A into the metal sample container (4) to the scale mark (5), and standing for 15-18 min to enable the asphalt or asphalt cement to fully act with the fibers to form a firm fiber-asphalt acting film;
C. testing
The rising button (18) is started to lift the fibers immersed in asphalt or asphalt cement at a speed lower than 10mm/min, the corresponding measured stress value every 0.5 seconds is read by the display screen (15), and the fiber-asphalt action film strength S of the No. 1-3 fibers is calculated by the following formula i ：
Fibre-bitumen action film Strength S i Stress sigma i X speed V
Wherein:
i＝1-3；
tension F i Recording the average value of the maximum pulling force of three times in the experimental process, wherein the unit is N;
area S is the area of contact of the fibers with the asphalt or asphalt cement, in mm 2 ；
Diameter D is the diameter of the fiber in mm;
stress sigma i Unit Pa;
intensity S i Unit Pa mm/min;
the speed V is the lifting speed of the fiber, and the unit is mm/min; the fiber-bitumen action film strength S of this fiber is calculated from the following formula:
strength of fiber-asphalt-acting film s= (strength of No. 1 fiber-asphalt-acting film S 1 +2 fiber-bitumen action film Strength S 2 +3 fiber-bitumen action film Strength S 3 )/3。
2. An experimental device according to claim 1, characterized in that the environmental chamber (2) is made of a high temperature resistant glass plate, which can be opened and closed on the side facing the control panel (14).
3. The experimental device according to claim 1, characterized in that the up button (18) controls the simultaneous up of fiber holder No. 1 (8), fiber holder No. 2 (9) and fiber holder No. 3 (10) at a speed below 10 mm/min.
4. The experimental device according to claim 1, characterized in that the lowering button (20) is provided with a first void, a second void and a third void, which in turn control the fiber holder No. 1 (8), the fiber holder No. 2 (9) and the fiber holder No. 3 (10), respectively, to lower them.
5. The experimental device according to claim 1, characterized in that the metal sample vessel (4) is equally divided into a first tank (4-1), a second tank (4-2) and a third tank (4-3), and scale marks (5) are arranged at 2/3 of the height of the metal sample vessel (4), and the first fiber holder (8), the second fiber holder (9) and the third fiber holder (10) are respectively corresponding to the first tank (4-1), the second tank (4-2) and the third tank (4-3) and are perpendicular to the bottom of the metal sample vessel (4).
6. The experimental device according to claim 1, characterized in that the display screen (15) displays the asphalt or asphalt cement temperature, the ambient box temperature, the preset temperature, the loading speed, the stress and the strength S of the fiber-asphalt reaction membrane measured every 0.5 seconds for each fiber holder i Experimental results.
7. The experimental set-up according to claim 1, wherein said fibers are inorganic fibers or organic fibers, the inorganic fibers being selected from basalt fibers, glass fibers or asbestos fibers; the organic fiber is selected from polyester fiber or polyacrylonitrile fiber.
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| CN108181234B (en) * | 2018-02-06 | 2021-03-16 | 山西省交通科学研究院 | Fiber and asphalt bonding performance testing device |
| CN110596111B (en) * | 2019-10-10 | 2023-10-27 | 南京林业大学 | Device and method for measuring influence of local heating on adhesion |
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