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
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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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