Device for testing adhesion between asphalt and aggregate

A test device and adhesion technology, applied in the direction of measuring devices, flow characteristics, analysis materials, etc., can solve the problems of time-consuming, difficult to grasp, and difficult to control heating temperature, etc., to achieve good results, save time, and reduce test costs Effect

Inactive Publication Date: 2012-06-27
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In reality, most of the water on the road falls on the ground in the form of rainwater. In addition to all the ions in tap water, there are chloride ions, sulfate ions, nitrate ions, sodium ions, magnesium ions, Potassium ions, etc., so the use of ordinary tap water cannot well simulate the effects of rainwater on the road surface other than scouring, such as corrosion, etc.
Therefore, the existing water boiling method is not easy to control the "slight boiling" state, and the heating temperature is not easy to control. The air pressure in various regions of our country is not the same, so it is not appropriate to use "slight boiling" temperature control, and the boiling of aggregates in tap water does not match the actual situation.
The water boiling device can only test one aggregate particle at a time, and then it is time-consuming to test multiple aggregate particles in parallel on the same sample

Method used

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  • Device for testing adhesion between asphalt and aggregate
  • Device for testing adhesion between asphalt and aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] exist figure 1 Among them, the asphalt and aggregate adhesion test device of the present embodiment is composed of a water spray pipe 1, a water pump 2, a nozzle 3, a thin line 4, a water tank 5, a sample cup 7, a barbed wire 8, a temperature-controlled electric furnace 10, and a base 11. , Asbestos net 12 connections form.

[0014] On the base 11, a water tank 5 is fixedly connected with a threaded fastening connector. The water tank 5 of the present embodiment is a plexiglass water tank, and the wall thickness of the water tank 5 is 10mm. It can simulate the situation that the road surface is soaked in water under the real rainfall conditions and is subjected to the vehicle load. The chemical composition of the rainwater 9 is different in different regions. The rainwater 9 in the water tank 5 of this embodiment adopts the rainwater 9 in Guangzhou. The PH value of Guangzhou Rainwater 9 is 4.9, and the conductivity is 15us·cm -1 , Fluoride ion 6umol / L, chloride ion 12...

Embodiment 2

[0018] In this embodiment, a barbed wire 8 is fixedly connected with a threaded fastening connector on the top of the water tank 5, and five sample cups 7 are fixedly installed on the barbed wire 8, and the shape of the sample cup 7 is a hemispherical crown body. Aggregate particles 6 coated with asphalt are fixed inside 7 . Five nozzles 3 are installed on the lower surface of each water spray pipe 1 through screw connection, and the nozzles 3 are connected with the interior of the water nozzle 1. The diameter of the spray holes of the nozzles 3 is 0.5mm, and the lower ends of the nozzles 3 are tied with thin wires. 4. The thin wire 4 is made of nylon wire, and the lower end of the thin wire 4 is bundled in the middle of the asphalt-coated aggregate particles 6 , and the asphalt-coated aggregate particles 6 are vertically placed in the sample cup 7 . Other components and the coupling relationship of the components are the same as in Embodiment 1.

Embodiment 3

[0020] In this embodiment, a barbed wire 8 is fixedly connected with a threaded fastening connector on the top of the water tank 5, and five sample cups 7 are fixedly installed on the barbed wire 8, and the shape of the sample cup 7 is a hemispherical crown body. Aggregate particles 6 coated with asphalt are fixed inside 7 . Five nozzles 3 are installed on the lower surface of each water spray pipe 1 through screw connection, and the nozzles 3 communicate with the interior of the water nozzle 1. The aperture of the water spray hole of the nozzle 3 is 2mm, and the lower end of the nozzle 3 is tied with a thin line 4 , the thin wire 4 is made of nylon wire, the lower end of the thin wire 4 is bundled in the middle of the asphalt-coated aggregate particles 6 , and the asphalt-coated aggregate particles 6 are vertically placed in the sample cup 7 . Other components and the coupling relationship of the components are the same as in Embodiment 1.

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Abstract

The invention relates to a device for testing adhesion between asphalt and an aggregate, wherein a water tank is arranged on a base; a temperature control electric furnace positioned on the outside surface at the bottom of the water tank is arranged on the base; an asbestosed wire gauze is arranged between the temperature control electric furnace and the water tank; a wire gauze is arranged on the side wall at the upper part of the water tank; at least two sample cups filled with aggregate particles coated with asphalt are arranged on the wire gauze; a water pump communicated with the interior of the water tank is arranged on the base; rainwater is contained in the water tank; a water spraying pipe just above the water tank is arranged on a water outlet pipe of the water pump; spray heads communicated with the interior of the water spraying pipe are arranged on the lower surface of the water spraying pipe; the spray heads and the sample cups are same in number; and a fine line, the lower end of which is connected onto the aggregate particles coated with the asphalt, is arranged at the lower end of each spray head. The device disclosed by the invention overcomes the trouble for performing a parallel test for many times and can be used for at least manufacturing two aggregates under the same condition, so that the device has the advantages of reducing experimental error, ensuring experimental precision, saving time, increasing experimental efficiency and reducing experimental cost.

Description

technical field [0001] The invention belongs to the technical field of test devices for asphalt and asphalt mixture in highway engineering, and in particular relates to test equipment or devices for asphalt and aggregate adhesion. Background technique [0002] At present, the adhesion test between coarse aggregate and asphalt mainly adopts water boiling method and water immersion method. The water boiling method test requires water to be in a "slight boiling" state. What is the "slight boiling" state? It is not specified in the "Test Procedure for Mixtures" (JTJ 0522000) T 0616-1993, so everyone's understanding varies from person to person. If the "slight boiling" state is not well controlled, intense large bubbles will appear, and different boiling degrees of water will have different scouring forces on the asphalt film. When the vehicle is driving at high speed on a rainy road, the water between the tire and the road is continuously squeezed by the tire, generating water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 裴建中孙梦青杜群乐李彦伟石鑫张久鹏温永
Owner CHANGAN UNIV
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