Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof

A warm-mix asphalt and mixture technology, applied in the field of material science and engineering, can solve problems such as unstable road performance, achieve the effects of reducing exhaust gas emissions and saving energy

Active Publication Date: 2009-12-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although cold-mix asphalt mixture has certain advantages in terms of environmental protection and energy saving, it is generally only used for road maintenance due to its unstable road performance.

Method used

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  • Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof
  • Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof
  • Warm-mixed auxiliary agent for asphalt mixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Superpave gradation design method is used for gradation design. Taking Superpave12.5 as an example, the gyratory compactor is used for forming. The forming pressure of the gyratory compactor is 600KPa, and the design rotation times are N-Initial=9, N-Design=125 and N-Max=205 (the addition amount of warm mix asphalt mixture additive is 0.4% of the total mass of asphalt mixture):

[0033] 1. Asphalt: SBS modified asphalt provided by Hubei Ezhou Keshi Asphalt Material Co., Ltd. is used, and its quality requirements meet the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004).

[0034] 2. Warm mix asphalt additives:

[0035] The warm mix asphalt additive is composed of synthetic zeolite and sodium sulfate decahydrate, the ratio is 96:4, the water release amount of the mixture is 13.6% when dried at 125°C for 2 hours, and the water release amount is 21.5% after continuous drying at 200°C for 2 hours .

[0036] The technical indicators of sy...

Embodiment 2

[0046] Take densely graded asphalt concrete mixture AC-13 as an example (the addition amount of warm mix asphalt mixture additive is 0.5% of the total mass of asphalt mixture):

[0047] 1. Asphalt: No. 90 road petroleum asphalt provided by Liaoning Panjin North Asphalt Co., Ltd. is used, and its quality requirements meet the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004).

[0048] 2. Warm mix asphalt additives:

[0049] The warm-mix asphalt additive is composed of synthetic zeolite and sodium sulfate decahydrate, and its mass ratio is 95:5. The water release amount of the mixture is 13.8% when it is dried at 125°C for 2 hours, and the water release amount is 19.7% when it is continuously dried at 200°C for 2 hours. %.

[0050] The technical indicators of synthetic zeolite are: yellow-white powder, SiO 2 The content is 30.6%, Al 2 o 3 The content is 29.2%, Na 2 The content of O is 16.1%, the amount of crystallization water released a...

Embodiment 3

[0058] Take graded asphalt concrete mixture AC-20 as an example (the addition amount of warm mix asphalt mixture additive is 0.3% of the total mass of asphalt mixture):

[0059] 1. Asphalt: No. 70 road petroleum asphalt provided by Hubei Ezhou Keshi Asphalt Material Co., Ltd. is used, and its quality requirements meet the "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004).

[0060] 2. Warm mix asphalt additives:

[0061] The warm-mix asphalt additive is composed of synthetic zeolite and sodium sulfate decahydrate, and its mass ratio is 94:6. The water release amount of the mixture is 13.0% when it is dried at 125°C for 2 hours, and the water release amount is 18.7% when it is continuously dried at 200°C for 2 hours. %.

[0062] The technical indicators of synthetic zeolite are: yellow-white powder, SiO 2 The content is 26.28%, Al 2 o 3 The content is 28.32%, Na 2 The content of O is 17.36%, the amount of crystallization water released a...

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Abstract

The invention relates to a warm-mixed auxiliary agent for asphalt mixture. The auxiliary agent is formed by uniformly mixing 93 to 97 percent of synthetic zeolite with 3 to 7 percent of granular sodium sulfate decahydrate by weight, wherein the synthetic zeolite includes 15 to 22 percent of crystal water, and the sodium sulfate decahydrate includes 55.9 percent of crystal water. Under normal temperature, the auxiliary agent is mixed with other raw materials according to the content of 0.3 to 0.5 percent of the total mass of the mixture, thereby preparing the product of the warm-mixed asphalt mixture; and other raw materials are 150 to 165 DEG C asphalt, 140 to 180 DEG C aggregate and mineral powder filling materials. During the blending of the mixture, the warm-mixed addition agent and the heated asphalt are added simultaneously, great amount of vapor generated by the moisture-containing auxiliary agent are released, which results in volumetric expansion of the asphalt, thereby forming foamed asphalt; meanwhile, the workability of the asphalt can be enhanced, the blending and mold temperature of the mixture can be reduced by 15 to 25 DEG C, exhaust emission can be effectively reduced, energy consumption is lowered, the aging of asphalt during blending is reduced, and the auxiliary agent has the advantages of simple preparation and low cost.

Description

technical field [0001] The invention belongs to the field of material science and engineering, and in particular relates to a preparation method of a warm-mix asphalt mixture additive and a warm-mix asphalt mixture. Background technique [0002] Currently, energy shortage and air pollution are two severe challenges facing mankind. In order to protect the ecological environment, countries around the world strictly control the emission of carbon dioxide and other harmful gases. Energy saving and environmental protection have become hot issues of concern to the whole society. At the same time, energy saving and environmental protection are also key indicators to measure the maturity of an application technology. The production of asphalt mixture is a large energy consumption in road engineering. The traditional hot-mix asphalt mixture is a hot-mix hot-paving material, which requires high temperature during mixing, paving and rolling, so it not only consumes a lot of energy dur...

Claims

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Application Information

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IPC IPC(8): C04B22/14C04B26/26
CPCY02A30/30
Inventor 文进刘至飞韩君涂瓛吴少鹏庞凌陈美祝刘杰胜张涛张园
Owner WUHAN UNIV OF TECH
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