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Method for preparing multifunctional mineral asphalt concrete pavement material

A technology for asphalt concrete and concrete pavement, which is applied in the field of road pavement materials, can solve the problems of large microwave heating depth, low microwave absorption rate, and slow heating speed of pavement, so as to improve tensile strength, simple preparation process, and improve flame retardancy Effect

Inactive Publication Date: 2010-07-28
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the process of microwave heating of asphalt concrete pavement, there are obvious defects 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 a series of problems such as low microwave absorption rate, large microwave heating depth, and slow temperature rise of the road surface.
[0005] Adding artificial microwave absorbers to asphalt concrete limits its widespread use due to its high cost
[0006] However, asphalt concrete contains asphalt material, which is a flammable material, and it is prone to fire in improper microwave heating or traffic accidents. Asphalt flame retardant is also a problem faced by asphalt pavement materials. Usually, chemical substances are used to flame retardant, and there is also the problem of high cost.
[0007] Fiber-reinforced asphalt concrete materials are also a conventional method for improving the mechanical properties of asphalt concrete. The high-strength inorganic basalt fibers mentioned in the patent 200710021648.7 require that the inorganic fibers have an elastic modulus greater than 85GPa and a tensile strength greater than 3500GPa. Obviously, mineral fibers are very It is difficult to achieve these indicators, and the cost is high, which limits its wide application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method uses Shell 90# asphalt for road as the cementing material, the coarse aggregate is limestone crushed stone, the fine aggregate is magnetite powder, and the ratio of mineral asphalt concrete is: Fe 3 O 4 10 grams of 55% magnetite powder, 10 grams of pitch, magnetite powder particle diameter less than 0.075 mm, short brucite fiber length of 2.36 mm, weight of brucite fiber 5 g, limestone gravel coarse aggregate 130 G, mixed uniformly at a temperature of 155°C±5°C, and molded under a pressure of 20Mpa to obtain a cylindrical sample with a diameter of 50 mm and a height of 26 mm. Heating for 60 seconds under the condition of 0.5kw output power of 2.45GHz microwave frequency, the temperature of asphalt concrete increased by 40℃, while the traditional asphalt concrete without magnetite powder and brucite fiber, heated for the same time, the temperature did not rise 4°C. Compared with ordinary asphalt concrete, the oxygen index of mineral asphalt concrete...

Embodiment 2

[0030] The preparation method uses Shell 90# asphalt for road as the cementing material, the coarse aggregate is limestone crushed stone, the fine aggregate is magnetite powder, and the ratio of mineral asphalt concrete is: Fe 3 O 4 15 g of 55% magnetite powder, 10 g of pitch, magnetite powder particle diameter of less than 0.075 mm, short brucite fiber length of 2.36 mm, weight of brucite fiber 10 g, calculated according to continuous gradation 120 grams of coarse aggregate of limestone crushed stone, mixed uniformly at a temperature of 155℃±5℃, and pressed into a shape under a pressure of 20Mpa to obtain a cylindrical sample with a diameter of 50 mm and a height of 26 mm. Heating for 60 seconds under the condition of 2.45GHz microwave frequency 0.5kw output power, the temperature of asphalt concrete increased by 60℃, and the asphalt concrete without magnetite powder and brucite fiber, heated for the same time, the temperature rose less than 4 ℃. Compared with ordinary asphalt...

Embodiment 3

[0032] The preparation method uses Shell 70# asphalt for road as the cementing material, the coarse aggregate is limestone crushed stone, the fine aggregate is magnetite powder, and the slag asphalt concrete ratio is: Fe 3 O 4 20 grams of 50% magnetite powder, 10 grams of pitch, magnetite powder particle diameter is less than 0.075 mm, brucite fiber length is 1.18 mm, brucite fiber weight 15 g, 0.075-4.75 calculated according to the gradation The coarse aggregate of limestone crushed stone with a diameter of 115 grams is mixed uniformly at a temperature of 155℃±5℃, and molded under a pressure of 20Mpa to obtain a cylindrical sample with a diameter of 50 mm and a height of 26 mm. When heated for 60 seconds at a microwave frequency of 2.45GHz with an output power of 0.5kw, the temperature of the asphalt concrete increased by 66°C, while the asphalt concrete without magnetite powder and brucite fiber was heated for the same time, the temperature rose less than 4 ℃. Compared with o...

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Abstract

The invention discloses a method for preparing a multifunctional mineral asphalt concrete pavement material. The preparation method comprises the step of adding magnetic iron powder and brucite short fibers in traditional asphalt concrete to replace part of aggregate in the raw materials of the traditional asphalt concrete, wherein the weight sum of the added magnetic iron powder and the brucite short fibers accounts for 10-25% of the total weight of the asphalt concrete materials in terms of the mass ratio; the weight of asphalt and natural aggregate accounts for 75-90% of the total weight of the asphalt concrete materials; and the weight ratio of the magnetic iron powder to the brucite short fibers is 1-4:1. By adjusting microwave electromagnetic parameters of the asphalt concrete, the microwave heating rate is improved by a dozen times compared with the traditional asphalt concrete, the mechanical property and the flame retardance of the asphalt concrete are improved at the same time while the material cost is lower, pavement microwave deicing and snow melting efficiency can be increased, and the mechanical property and the flame retardance are good when the pavement microwave rapid heating maintenance is realized, thus being applicable to asphalt concrete pavement.

Description

Technical field [0001] The invention relates to the technical field of road pavement materials, in particular to a preparation method of a multifunctional mineral asphalt concrete pavement material used for microwave heating. Background technique [0002] As we all know, road deicing in winter is of great significance to road transportation safety and ensuring smooth traffic. Microwave heating is an advanced technology for road deicing, and a lot of research has been done at home and abroad. [0003] The regeneration and maintenance of microwave-heated asphalt concrete pavement are also of great significance for saving road construction costs, prolonging the service life of road materials, and energy saving and environmental protection. [0004] However, in the process of microwave heating of asphalt concrete pavement, there is obviously the defect of low microwave heating efficiency, which severely limits the application and promotion of microwave heating technology in the field of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B14/38
Inventor 赵鹏王振军艾涛
Owner CHANGAN UNIV
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