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Slag asphalt concrete pavement material composition for microwave heating

A technology of asphalt concrete and microwave heating, which is applied in the field of road pavement materials, can solve the problems of large microwave heating depth, slow temperature rise of the road surface, and high cost, and achieve the effects of simple preparation process, low cost, and convenient maintenance

Inactive Publication Date: 2010-07-14
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of microwave heating of asphalt concrete pavement, there is obviously a problem of low microwave heating efficiency, which seriously limits the application and promotion of microwave heating technology in the field of pavement materials.
The reason is that the electromagnetic parameters of the asphalt concrete material itself are unreasonable, resulting in low microwave absorption rate of the road surface, large microwave heating depth, and slow temperature rise of the road surface. Adding artificial microwave absorbers to asphalt concrete limits its use due to high cost. Widespread use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Shell 90# asphalt for roads is selected as the cementing material, the coarse aggregate is limestone crushed stone and massive slag, the fine aggregate is magnetite powder and limestone slag, and the ratio of slag asphalt concrete is: 10 grams of magnetite powder, 5 grams of limestone powder, 10 grams of asphalt, 58 grams of massive steel slag coarse aggregate with a particle diameter of 0.075-2.36 mm and a FeO content of 35%, and 80 grams of limestone gravel coarse aggregate with a particle diameter of 0.075-4.75 mm. Stir evenly at 155°C±5°C, press and form under a pressure of 20Mpa to obtain a cylindrical sample with a diameter of 50mm and a height of 26mm. When heated for 40 seconds at a microwave frequency of 2.45GHz and an output power of 0.5kw, the temperature rose by 50°C, while traditional asphalt concrete without slag was heated for the same time, and the temperature rose by less than 3°C. Under the microwave frequency of 0.9-6GHz, the electromagnetic wave refl...

Embodiment 2

[0023] Shell 70# asphalt used for roads is selected as the cementing material, the coarse aggregate is limestone gravel and massive slag, the fine aggregate is limestone slag, and the proportion of slag concrete is: 12 grams of limestone slag, 10 grams of asphalt, and the particle diameter is 33 grams of massive steel slag coarse aggregate with a diameter of 2.36-4.75 mm and a FeO content of 35%, and 82 grams of limestone crushed stone coarse aggregate with a particle diameter of 0.075-4.75 mm. Stir evenly at a temperature of 155°C±5°C. Press down to obtain a cylindrical sample with a diameter of 50 mm and a height of 26 mm. When heated for 40 seconds at a microwave frequency of 2.45GHz and an output power of 0.5kw, the temperature rose by 35°C, while asphalt concrete without slag was heated for the same time, and the temperature rose by less than 3°C. Under the microwave frequency of 0.9-6GHz, the electromagnetic wave reflectivity of the slag asphalt concrete material is meas...

Embodiment 3

[0025] Shell 70# asphalt used for roads is selected as the cementing material, the coarse aggregate is limestone gravel and massive copper slag, the fine aggregate is magnetite powder, and the ratio of slag concrete is: 19 grams of magnetite powder, 10 grams of asphalt, 18 grams of massive copper slag coarse aggregate with a particle diameter of 0.075-2.36 mm and a FeO content of 43%, 98 grams of limestone crushed stone coarse aggregate with a particle diameter of 0.075-4.75 mm, stirred evenly at a temperature of 155°C ± 5°C, Press molding under a pressure of 20 MPa to obtain a cylindrical sample with a diameter of 50 mm and a height of 26 mm. When heated for 40 seconds at a microwave frequency of 2.45GHz and an output power of 0.5kw, the temperature rose by 30°C, while asphalt concrete without slag was heated for the same time, and the temperature rose by less than 3°C. Under the microwave frequency of 0.9-6GHz, the average electromagnetic wave reflectance of the slag asphalt...

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Abstract

The invention discloses a slag road asphalt concrete pavement material composition suitable for microwave heating. In the preparation process of road asphalt concrete, magnetic powder is added and is used for fully or partially replacing the lime stone powdered ore in the traditional asphalt concrete raw material, magnetic metallurgical slag is used for replacing the natural coarse aggregate in the traditional asphalt concrete raw material, and thus the finally obtained composition comprises magnetic powder, lime stone powdered ore, asphalt, magnetic metallurgical slag and natural coarse aggregate. Compared with the traditional asphalt concrete for microwave heating, the slag asphalt concrete of the invention improves the heating rate by several times to dozens of times, has lower cost, can greatly improve ice removing and snow melting efficiency by microwaves, and is widely applied to various asphalt concrete highway pavements, airports, factories, offices, schools, armies and other organizations.

Description

technical field [0001] The invention relates to the field of road pavement materials, in particular to a slag road asphalt concrete pavement material composition suitable for microwave heating. Background technique [0002] As we all know, deicing roads in winter is of great significance to road transportation safety and smooth traffic. Microwave heating is an advanced technology for road deicing, and a lot of research has been done at home and abroad. The regeneration and maintenance of asphalt concrete pavement by microwave heating is also of great significance for saving road construction costs, prolonging the service life of road materials, energy saving and environmental protection. [0003] However, in the process of microwave heating of asphalt concrete pavement, there is obviously a problem of low microwave heating efficiency, which seriously limits the application and promotion of microwave heating technology in the field of pavement materials. The reason is that ...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B18/14
CPCY02W30/91
Inventor 赵鹏艾涛王振军
Owner CHANGAN UNIV
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