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A compound flame-retardant mineral powder and flame-retardant asphalt mixture for tunnel asphalt pavement

An asphalt pavement and mineral powder technology, which is applied in the field of flame retardant asphalt, can solve the problems of less attention to the flame retardant and smoke suppression performance and road performance of asphalt pavement, and achieves lower combustion heat and smoke emission rate, low price, and improved resistance. flammable effect

Active Publication Date: 2017-11-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Existing flame retardants rarely take into account the flame retardant and smoke suppression performance and road performance of asphalt pavement

Method used

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  • A compound flame-retardant mineral powder and flame-retardant asphalt mixture for tunnel asphalt pavement
  • A compound flame-retardant mineral powder and flame-retardant asphalt mixture for tunnel asphalt pavement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The flame-retardant asphalt mixture is composed of coarse aggregate, fine aggregate, asphalt, and compound flame-retardant mineral powder. The mass ratio is coarse aggregate: fine aggregate: asphalt: compound flame-retardant mineral powder = 100:20:5.0: 5.2.

[0039] The coarse aggregate is basalt; the fine aggregate is basalt; the asphalt is No. 70 A grade road petroleum asphalt.

[0040] The compound flame retardant mineral powder is compounded by limestone, slaked lime and hydrotalcite with a mass ratio of 60:25:15.

[0041] Described slaked lime selects 1250 mesh slaked lime for use, median diameter 8 μm, Ca(OH) 2 The purity is 95%; the specific surface area of ​​the hydrotalcite is 80m 2 / g.

[0042] Heat the asphalt to 160°C, add it to the aggregate at 180°C and mix for 90 seconds, then add the compound flame-retardant mineral powder at the same time, mix for 90 seconds again, and then go through the molding process to obtain the flame-retardant asphalt concret...

Embodiment 2

[0073] The compound flame retardant mineral powder is composed of limestone, slaked lime and hydrotalcite, and the mass ratio is limestone:slaked lime:hydrotalcite=60:20:20.

[0074] Described slaked lime selects 1250 mesh slaked lime for use, median diameter 8 μm, Ca(OH) 2 95% purity;

[0075] The specific surface area that described hydrotalcite selects is 80m 2 / g;

[0076] The fire-retardant asphalt mixture for tunnels is composed of coarse aggregate, fine aggregate, asphalt, fiber, and compound flame-retardant mineral powder. The mass ratio is coarse aggregate: fine aggregate: asphalt: fiber: compound flame-retardant mineral powder = 100 :20:4.8:0.2:5.1. The coarse aggregate is basalt; the fine aggregate is basalt; the asphalt is SBS modified asphalt; and the fiber is basalt fiber.

[0077] The production adopts a batch-type asphalt mixing plant. Before production, the compound flame-retardant mineral powder is mixed evenly according to the proportion and then pumped ...

Embodiment 3

[0079] The compound flame retardant mineral powder is composed of limestone, slaked lime and hydrotalcite-like, and the mass ratio is limestone:slaked lime:hydrotalcite-like=70:20:10. The raw materials are selected according to the above ratio, mixed and stirred to obtain a compound flame-retardant mineral powder.

[0080] Described slaked lime selects 800 mesh slaked lime for use, median diameter 15 μ m, Ca(OH) 2 90% purity;

[0081] The specific surface area of ​​the selected hydrotalcite is 120m 2 / g;

[0082] The flame-retardant asphalt mixture is composed of coarse aggregate, fine aggregate, asphalt, and compound flame-retardant mineral powder. The mass ratio is coarse aggregate: fine aggregate: asphalt: compound flame-retardant mineral powder = 100:20:5.5: 5.7. The coarse aggregate is basalt; the fine aggregate is basalt; the asphalt is SBS modified asphalt.

[0083] The production adopts a batch-type asphalt mixing plant. Before production, the compound flame-retar...

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Abstract

The invention discloses a compound flame-retardant ore powder for tunnel asphalt pavements. The compound flame-retardant ore powder comprises the following components in parts by weight: 40-80 parts of limestone, 10-30 parts of slaked lime and 10-30 parts of hydrotalcite compounds. The invention also discloses an asphalt mixture with the compound flame-retardant ore powder. The compound flame-retardant ore powder disclosed by the invention has obvious flame retardancy for the asphalt in the flame-retardant asphalt concrete, and can enhance the high / low-temperature properties and water stability of the prepared flame-retardant asphalt concrete.

Description

technical field [0001] The invention relates to the field of flame-retardant asphalt, and a compound flame-retardant mineral powder and flame-retardant asphalt mixture used for tunnel asphalt pavement. Background technique [0002] Asphalt is flammable. When a tunnel fire occurs, the temperature of the tunnel asphalt pavement will be much higher than the ignition point of the asphalt, thus igniting asphalt within a certain range. On the one hand, the burning of asphalt releases heat to promote the spread of the fire, on the other hand, it releases a large amount of toxic smoke, which hinders the escape of people in the affected area. The fire safety of tunnel asphalt pavement has been continuously concerned by scholars at home and abroad. Adding flame retardants to improve the flame retardant and smoke suppression performance of asphalt pavement is one of the effective ways to solve this problem. Metal hydroxide flame retardants, typically represented by aluminum hydroxide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26C04B22/10C04B103/63
CPCC04B26/26C04B40/0042C04B2103/63C04B14/14C04B22/10C04B22/064C04B22/06
Inventor 吴珂朱凯李红仙康诚黄志义
Owner ZHEJIANG UNIV
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