CN202886251U - Device for evaluating influence of surface texture to stickiness of asphalt and aggregate - Google Patents

Abstract

The utility model relates to a device for evaluating influence of surface texture to stickiness of asphalt and aggregate. An aggregate asphalt interlay test piece in a sandwich structure is adhered by using a lower base disc and an upper base disc, a rotating rod is rotated so as to enable a lower aggregate sample of the aggregate asphalt interlay test piece to generate force with the direction opposite to the rotating direction of an upper aggregate sample, the lower aggregate sample is cracked at an asphalt film section, a torque sensor detects the value of a torque acting on the test piece in the torsion process in real time, and torques corresponding to the test piece are detected, so that the shearing damage of an asphalt mixing material can be truly simulated, the stickiness between the asphalt and the aggregate is reflected, the influence of the surface roughness of the aggregate to the stickiness of the asphalt and the aggregate is researched, the reliable basis for the research on the stickiness of the asphalt and the aggregate is provided, and moreover, the device provided by the utility model is simple in structure and convenient to operate.

Description

Apparatus for evaluating the effect of surface texture on the adhesion of asphalt to aggregates

technical field

The utility model belongs to the technical field of asphalt and aggregate adhesion evaluation, in particular to a device for studying the influence of aggregate surface texture on the asphalt and aggregate adhesion.

Background technique

As a very important geotechnical material, asphalt is widely used in road engineering and building waterproofing engineering. In my country, more than 90% of the highway pavement that has been built is asphalt pavement, and the adhesion between asphalt and aggregate directly affects the use quality and durability of asphalt pavement, so the adhesion is an important index to evaluate the technical performance of asphalt . The water resistance (i.e. stripping resistance) of asphalt-coated aggregates is not only closely related to the properties of asphalt, but also related to the surface texture of aggregates. Therefore, in order to improve the performance of asphalt pavement, it is necessary to understand the influence of aggregate surface texture on the adhesion of asphalt and aggregate. Therefore, it is necessary to propose a method to evaluate the effect of aggregate surface roughness on the adhesion of asphalt to aggregate.

At present, the methods for evaluating the adhesion between asphalt and aggregates include water boiling method, gravimetric method, photoelectric colorimetry, NAT method, static water immersion method, capillary column method, etc., but none of them is aimed at the effect of aggregate surface texture on asphalt. A method for the effect of adhesion to aggregates. Therefore, a simple, effective and economical method is needed to study the effect of aggregate surface roughness on the adhesion of asphalt and aggregates.

Utility model content

One purpose of the utility model is to overcome the shortcomings of the evaluation of the adhesion of asphalt and aggregates in the prior art, and provide a simple structure, which can judge the influence of different textures on the adhesion of asphalt and aggregates by detecting torque. device.

The technical solution to solve the above technical problems is: the device used to evaluate the influence of surface texture on the adhesion of asphalt and aggregates is provided with a bracket and a lower fixing rod on the base, and the lower chassis parallel to the base is arranged on the upper end of the fixing rod. An upper chassis symmetrical to the lower chassis is arranged above the lower chassis. The upper chassis is connected with the power output shaft of the motor installed on the bracket through a rotating rod. A speed sensor and a torque sensor are installed on the rotating rod. The speed sensor and the torque sensor The A/D converter is connected to the input port of the computer through the wire, the output port of the computer is connected to the control unit through the wire, and the control unit is connected to the motor through the wire.

The device for evaluating the influence of surface texture on the adhesion of asphalt and aggregates in the utility model is to bond the aggregate asphalt interlayer test piece with a "sandwich" structure through the lower chassis and the upper chassis, and turn the rotating rod to make the aggregate asphalt interlayer test piece fit. The lower aggregate sample generates a force in the opposite direction to the rotation of the upper aggregate sample, and the lower aggregate sample breaks in the asphalt film section. The torque sensor detects the torque value acting on the specimen during the torsion process in real time, and detects the The corresponding torque can truly simulate the shear failure of asphalt mixture, reflect the adhesion performance between asphalt and aggregate, and can study the influence of aggregate surface roughness on the adhesion of asphalt and aggregate, and is the basis for asphalt The study on the adhesion to the aggregate provides a reliable basis, and the device of the utility model has a simple structure and is easy to operate.

Description of drawings

Fig. 1 is a schematic diagram of the device structure of the present invention.

Figure 2 is a schematic diagram of the structure of the aggregate asphalt interlayer specimen in Figure 1.

Fig. 3 is a schematic diagram of the aggregate surface texture in Fig. 2 .

Detailed ways

The utility model is now further described in conjunction with the accompanying drawings and embodiments, but the utility model is not limited to the following embodiments.

Referring to Fig. 1, the asphalt and aggregate adhesion detection device of the present embodiment consists of a base 1, a support 2, a lower fixed rod 3, a lower chassis 4, an aggregate asphalt interlayer test piece 5, an upper chassis 6, a rotating rod 7, a rotating speed The sensor 8, the motor 9, the torque sensor 10, the control unit 11, the computer 12 and the A/D converter 13 are connected to form.

On the base 1, a lower fixed rod 3 and a support 2 are fixedly installed by threaded fasteners, the upper end of the lower fixed rod 3 is connected with a lower chassis 4 through a threaded connection, and a motor 9 is installed on the support 2 with a threaded fastening connector. The output shaft of 9 is connected with a connecting piece to install a rotating rod 7, and the lower end of the rotating rod 7 is connected with an upper chassis 6 through a threaded connection. The geometric shape of the upper chassis 6 is exactly the same as that of the lower chassis 4. The asphalt interlayer specimen 5 is clamped between the upper chassis 6 and the lower chassis 4 .

The aggregate asphalt interlayer specimen 5 is a “sandwich” structure in which the upper aggregate sample 5-1 and the lower aggregate sample 5-3 are bonded together through the asphalt film 5-2.

On the rotating rod 7, a speed sensor 8 and a torque sensor 10 are installed, the speed sensor 8 and the torque sensor 10 are respectively connected to the A/D converter 13 by a wire, and the A/D converter 13 is connected to the input port of the computer 12 by a wire, The output end of the computer 12 is connected to the control unit 11 through wires, and the output end of the control unit 11 is connected to the motor 9 through wires. The rotational speed sensor 8 and the torque sensor 10 convert the collected upper chassis 6 rotational speed signal and torque signal into electrical signals and transmit them to the A/D converter 13, and the A/D converter 13 converts the input pulse electrical signals into digital signals and transmits them through wires to computer 12 .

The computer 12 performs calculations according to preset programs, displays the calculation results through the display, and controls the rotation of the motor 9 through the control unit 11 .

When in use, the prepared aggregate asphalt interlayer test piece 5 is bonded to the upper and lower end surfaces of the upper and lower chassis 6 and the lower chassis 4 respectively with epoxy resin, and fixed between the lower chassis 4 and the upper chassis 6, Start the motor 9, control the rotational speed to 0.5 rpm, detect the rotational speed in real time by the rotational speed sensor 8, and convert the rotational speed signal into a digital signal through the A/D converter 13 and transmit it to the computer 12, and the computer 12 compares the set value with the actual detection If they are equal, they will be kept constant. If there is a deviation, a command will be sent to the control unit 11, and the control unit 11 will control the motor 9 to adjust the speed until the set value is equal to the detected value. The rotation of the motor 9 transmits the torsional force to the upper chassis 6 through the rotating rod 7, and the upper chassis 6 drives the upper aggregate sample 5-1 of the aggregate asphalt interlayer test piece 5 to rotate, while the lower aggregate sample 5-1 of the aggregate asphalt interlayer test piece 5 -3 is fixed on the upper surface of the lower chassis 4 to generate a force in the opposite direction to the rotation of the upper aggregate sample 5-1, and the lower aggregate sample 5-3 breaks at the asphalt film 5-2 section, and the torque sensor 10 detects it in real time The torque value acting on the test piece during the torsion process is transmitted to the computer 12 through the A/D converter 13, and the computer 12 calculates according to the preset program to obtain the adhesion corresponding to the surface texture of different densities. Coefficient μ _n , compare and obtain the largest adhesion coefficient μ _max , and display it on the display. The maximum adhesion coefficient μ _max indicates that the cohesion between the aggregate and asphalt of aggregate asphalt interlayer specimen 5 is greater, that is, the adhesion between aggregate and asphalt is the strongest at this texture density.

The utility model conducts a torsion test on the detection sample of the aggregate asphalt interlayer test piece 5 made of the same aggregate with different surface textures, and measures the difference in torque, and can study the adhesion of the aggregate surface roughness to the asphalt and the aggregate. Impact.

Claims (1)

1. A device for evaluating the influence of surface texture on the adhesion of asphalt and aggregates, characterized in that: a bracket (2) and a lower fixing rod (3) are arranged on the base (1), and the base (1) The parallel lower chassis (4) is arranged on the upper end of the fixed rod (3), and an upper chassis (6) symmetrical to the lower chassis (4) is arranged above the lower chassis (4), and the upper chassis (6) passes through the rotating rod ( 7) It is connected with the power output shaft of the motor (9) installed on the bracket (2), and the speed sensor (8) and the torque sensor (10) are installed on the rotating rod (7), and the speed sensor (8) and the torque sensor (10) are respectively connected to the A/D converter (13) through the wire, the A/D converter (13) is connected to the input port of the computer (12) through the wire, and the output port of the computer (12) is connected to the control unit (11) through the wire ), and the control unit (11) is connected to the motor through wires.

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