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Red mud-based asphalt mixture warm-mixing agent and preparation method thereof

A technology of asphalt mixture and warm mix agent, which is applied in the field of asphalt warm mix agent, can solve the problems of reducing the water damage resistance of asphalt mixture, weakening the adhesion between asphalt and aggregate, and the high production cost of synthetic zeolite, so as to improve the resistance to water damage. Water damage ability, increase the freeze-thaw splitting strength ratio, and reduce the effect of comprehensive cost

Active Publication Date: 2019-02-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost of synthetic zeolite is high, and the addition of zeolite will weaken the adhesion between asphalt and aggregate, and reduce the water damage resistance of asphalt mixture, thus affecting the popularization and application of zeolite warm mix asphalt mixture

Method used

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  • Red mud-based asphalt mixture warm-mixing agent and preparation method thereof

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Effect test

Embodiment 1

[0053] 1. A warm mixing agent for red mud-based asphalt mixture, comprising the following components in terms of mass percentage: 40% red mud, 55% active silicon-aluminum source, 2% alkaline activator, and 3% surfactant.

[0054] The active silicon-aluminum source is a mixture of granulated blast furnace slag and silicon powder, so that the SiO in the geopolymer precursor 2 / Al 2 o 3 The molar ratio was adjusted to 2:1.

[0055] The alkaline activator is a mixed aqueous solution of sodium silicate and sodium hydroxide, wherein the mass ratio of sodium silicate and sodium hydroxide is 1:1, and the solid content of the activator is 20%.

[0056] 2. The preparation method of the above red mud-based asphalt mixture warm mix agent is as follows:

[0057] (1) Calcining the red mud powder at 600°C for 1 hour, causing defects in the lattice structure of the original red mud, improving the pozzolanic activity of the red mud, thereby increasing the leaching rate of the red mud in the...

Embodiment 2

[0065] 1. A warm mix agent for red mud-based asphalt mixture, comprising the following components by mass percentage: 50% red mud, 35% active silicon-aluminum source, 10% alkaline activator, and 5% surfactant.

[0066] The active silicon-aluminum source is a mixture of granulated blast furnace slag and silicon powder, so that the SiO in the geopolymer precursor 2 / Al 2 o 3 The molar ratio was adjusted to 3:1.

[0067] The alkaline activator is a mixed aqueous solution of sodium silicate and sodium hydroxide, the mass ratio of sodium silicate and sodium hydroxide is 1:2, and the solid content of the activator is 30%.

[0068] 2. The preparation method of the above red mud-based asphalt mixture warm mix agent is as follows:

[0069] (1) Calcining the red mud powder at 700°C for 2 hours, causing defects in the lattice structure of the original red mud, improving the pozzolanic activity of the red mud, thereby increasing the leaching rate of the red mud in the alkaline activato...

Embodiment 3

[0077] 1. A warm mixing agent for red mud-based asphalt mixture, comprising the following components in terms of mass percentage: 70% red mud, 30% active silicon-aluminum source, 8% alkaline activator, and 2% surfactant.

[0078] The active silicon-aluminum source is a mixture of granulated blast furnace slag and silicon powder, so that the SiO in the geopolymer precursor 2 / Al 2 o 3 The molar ratio was adjusted to 4:1.

[0079] The alkaline activator is a mixed aqueous solution of sodium silicate and sodium hydroxide, the mass ratio of sodium silicate and sodium hydroxide is 1:3, and the solid content of the activator is 30%.

[0080] 2. The preparation method of the above red mud-based asphalt mixture warm mix agent is as follows:

[0081](1) Calcining the red mud powder at 800°C for 3 hours, causing defects in the lattice structure of the original red mud, improving the pozzolanic activity of the red mud, thereby increasing the leaching rate of the red mud in the alkalin...

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Abstract

The invention relates to a red mud-based asphalt mixture warm-mixing agent and a preparation method thereof, and belongs to the technical field of asphalt warm-mixing agents. The preparation method comprises the following steps: step 1) calcining red mud powder and then mixing with an active aluminum silicon source in proportion, and allocating the molar ratio of SiO2 / Al2O3 to obtain a geopolymerprecursor; step 2) adding the geopolymer precursor obtained in the step 1) into an alkaline activator solution, and stirring to obtain geopolymer mud; step 3) curing the geopolymer mud obtained in thestep 2) to obtain a geopolymer block, and preparing the geopolymer block into powder; and step 4) adding the geopolymer powder obtained in the step 3) into a surfactant solution, stirring uniformly,and then suction-filtering and drying the obtained slurry to obtain the red mud-based asphalt mixture warm-mixing agent. According to the invention, the asphalt mixture warm-mixing agent is prepared by surface modification of red mud-based geopolymer powder, thereby effectively ensuring mechanical properties of an asphalt mixture while significantly reducing a mixing temperature and a molding temperature of the asphalt mixture.

Description

technical field [0001] The invention belongs to the technical field of asphalt warm mix agent, and in particular relates to a red mud-based asphalt mixture warm mix agent and a preparation method thereof. Background technique [0002] Warm mix asphalt mixture is an asphalt mixture that reduces the production and paving temperature of hot mix asphalt mixture through a certain process, and at the same time ensures that its performance reaches the standard of hot mix asphalt mixture. Mainly by adding certain additives to reduce the viscosity of asphalt during mixing and paving, while ensuring the construction quality, the mixing and paving temperature of asphalt mixture is reduced by 30°C -50°C. Asphalt mixture warm mixing technology not only reduces the mixing temperature of traditional asphalt mixture, but also reduces the energy consumption in the production process of asphalt mixture, and at the same time reduces the emission of a large number of harmful gases and dust, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B22/08C04B12/00C04B7/153C04B7/24
CPCC04B7/1535C04B7/243C04B12/005C04B22/00C04B40/0039C04B24/42C04B26/26Y02P40/10
Inventor 张吉哲姚占勇孙昌军李沛钊梁明蒋红光
Owner SHANDONG UNIV
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